DATA SHEET. BF1203 Dual N-channel dual gate MOS-FET DISCRETE SEMICONDUCTORS. Product specification Supersedes data of 2000 Dec 04.

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1 DISCRETE SEMICONDUCTORS DATA SHEET andbook, halfpage MBD12 BF123 Dual N-channel dual gate MOS-FET Supersedes data of 2 Dec 21 Apr 25

2 BF123 FEATURES Two low noise gain controlled amplifiers in a single package Superior cross-modulation performance during AGC High forward transfer admittance High forward transfer admittance to input capacitance ratio. APPLICATIONS Gain controlled low noise amplifiers for VHF and UHF applications with 3 to 9 V supply voltage, such as digital and analog television tuners and professional communications equipment. DESCRIPTION The BF123 is a combination of two different dual gate MOS-FET amplifiers with shared source and gate 2 leads. The source and substrate are interconnected. Internal bias circuits enable DC stabilization and a very good cross-modulation performance during AGC. Integrated diodes between the gates and source protect against excessive input voltage surges. The transistor is encapsulated in a SOT363 micro-miniature plastic package. PINNING - SOT363 PIN 1 gate 1 (a) 2 gate 2 3 drain (a) drain (b) 5 source 6 gate 1 (b) Top view Marking code: L2- DESCRIPTION g1 (b) AMP a g1 (a) s g2 d (b) AMP b d (a) Fig.1 Simplified outline and symbol. MBL25 QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Per MOS-FET unless otherwise specified V DS drain-source voltage 1 V drain current (DC) 3 ma y fs forward transfer admittance amp. a: = 15 ma ms amp. b: = 12 ma 25 3 ms C ig1-s input capacitance at gate 1 amp. a: =15mA; f=1mhz pf amp. b: =12mA; f=1mhz pf C rss reverse transfer capacitance f = 1 MHz 15 ff NF noise figure amp. a: f = MHz; =15mA 1 1. db amp. b: f = MHz; =12mA db X mod cross-modulation amp. a: input level for k = 1% at db AGC 15 db V amp. b: input level for k = 1% at db AGC 1 15 db V CAUTION This product is supplied in anti-static packing to prevent damage caused by electrostatic discharge during transport and handling. 21 Apr 25 2

3 BF123 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 613). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT Per MOS-FET unless otherwise specified V DS drain-source voltage 1 V drain current (DC) 3 ma I G1 gate 1 current 1 ma I G2 gate 2 current 1 ma P tot total power dissipation T s 12 C; note 1 2 mw T stg storage temperature C T j operating junction temperature 15 C Note 1. T s is the temperature at the soldering point of the source lead. THERMAL CHARACTERISTICS SYMBOL PARAMETER VALUE UNIT R th j-s thermal resistance from junction to soldering point 2 K/W 25 P tot (mw) 2 MGS T s ( C) Fig.2 Power derating curve. 21 Apr 25 3

4 BF123 STATIC CHARACTERISTICS T j =25 C unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT Per MOS-FET unless otherwise specified V (BR)DSS drain-source breakdown voltage V G1-S =V G2-S =; =1 A 1 V V (BR)G1-SS gate-source breakdown voltage V GS =V DS =; I G1-S =1mA 6 1 V V (BR)G2-SS gate-source breakdown voltage V GS =V DS =; I G2-S =1mA 6 1 V V (F)S-G1 forward source-gate voltage V G2-S =V DS =; I S-G1 =1mA V V (F)S-G2 forward source-gate voltage V G1-S =V DS =; I S-G2 =1mA V V G1-S(th) gate-source threshold voltage V DS =5V; V G2-S =V; =1 A.3 1 V V G2-S(th) gate-source threshold voltage V DS =5V; V G1-S =V; =1 A V SX drain-source current amp. a: ma V G2-S =V; V DS =5V; R G =62k note 1 amp. b: ma V G2-S =V; V DS =5V; R G = 12 k note 1 I G1-S gate cut-off current V G1-S =5V; V G2-S =V DS = 5 na I G2-S gate cut-off current V G2-S =5V; V G1-S =V DS = 2 na Note 1. R G1 connects gate 1 to V GG =5V. 21 Apr 25

5 BF123 DYNAMIC CHARACTERISTICS AMPLIFIER a Common source; T amb =25 C; V G2-S =V; V DS =5V; = 15 ma; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT y fs forward transfer admittance pulsed; T j =25 C ms C ig1-ss input capacitance at gate 1 f = 1 MHz pf C ig2-ss input capacitance at gate 2 f = 1 MHz 3 pf C oss output capacitance f = 1 MHz.9 pf C rss reverse transfer capacitance f = 1 MHz 15 3 ff F noise figure f = 1.7 MHz; G S =2mS; B S = 5 7 db f=mhz; Y S =Y Sopt 1 1. db f=mhz; Y S =Y Sopt db G tr power gain f = 2 MHz; G S =2mS; B S =B Sopt ; 32.5 db G L =.5 ms; B L =B Lopt ; note 1 f=mhz; G S =2mS; B S =B Sopt ; 27 db G L =1mS; B L =B Lopt ; note 1 f=mhz; G S = 3.3 ms; B S =B Sopt ; 21 db G L =1mS; B L =B Lopt ; note 1 X mod cross-modulation input level for k = 1%; f w =5MHz; f unw =6MHz; note2 at db AGC 9 db V at 1 db AGC 95 db V at db AGC 15 db V Notes 1. Calculated from measured s-parameters. 2. Measured in Fig.35 test circuit. 21 Apr 25 5

6 BF V G2-S = V MCD V 3 V 2.5 V 2 MCD936 V G1-S = 1. V 1.7 V V 1.6 V 1.5 V 1. V 1.3 V V 1.2 V 1 V V G1-S (V) V DS (V) V DS =5V. T j =25 C. Fig.3 Transfer characteristics; typical values. V G2-S =V. T j =25 C. Fig. Output characteristics; typical values. 1 I G1 (μa) V G2-S = V MCD V 3 V y fs (ms) 3 MCD93 V G2-S = V 3.5 V V 2 3 V 2 2 V 1.5 V 1 2 V 2.5 V V G1-S (V) V DS =5V. T j =25 C. V DS =5V. T j =25 C. Fig.5 Gate 1 current as a function of gate 1 voltage; typical values. Fig.6 Forward transfer admittance as a function of drain current; typical values. 21 Apr 25 6

7 BF MCD939 2 MCD I G1 (μa) V GG (V) V DS =5V; V G2-S =V. T j =25 C. V DS =5V; V G2-S =V; T j =25 C. R G1 =62k (connected to V GG ); see Fig.35. Fig.7 Drain current as a function of gate 1 current; typical values. Fig. Drain current as a function of gate 1 supply voltage (= V GG ); typical values R G1 = 39 kω 7 kω 56 kω MCD91 6 kω 2 kω 2 MCD92 V GG = 5 V 62 kω 1 kω.5 V V 3.5 V 1 3 V V GG = V DS (V) 2 6 V G2-S (V) V G2-S =V; T j =25 C. R G1 connected to V GG ; see Fig.35. V DS =5V; T j =25 C. R G1 =62k (connected to V GG ); see Fig.35. Fig.9 Drain current as a function of gate 1 (= V GG ) and drain supply voltage; typical values. Fig.1 Drain current as a function of gate 2 voltage; typical values. 21 Apr 25 7

8 BF123 6 I G1 (μa) MCD93 V GG = 5 V.5 V handbook, gain halfpage reduction (db) 1 MCD9 V 3.5 V V V G2-S (V) VAGC (V) V DS =5V; T j =25 C. R G1 =62k (connected to V GG ); see Fig.35. V DS =5V; V GG =5V; R G1 =62k ; f = 5 MHz; T amb =25 C. Fig.11 Gate 1 current as a function of gate 2 voltage; typical values. Fig.12 Typical gain reduction as a function of the AGC voltage; see Fig V unw (dbμv) 11 MCD95 2 MCD gain reduction (db) gain reduction (db) V DS =5V; V GG =5V; R G1 =62k ; f = 5 MHz; f unw =6MHz; T amb =25 C. Fig.13 Unwanted voltage for 1% cross-modulation as a function of gain reduction; typical values; see Fig.35. V DS =5V; V GG =5V; R G1 =62k ; f = 5 MHz; T amb =25 C. Fig.1 Drain current as a function of gain reduction; typical values; see Fig Apr 25

9 BF MGT5 1 3 MGT y is (ms) y rs (μs) ϕ rs ϕ rs 1 2 b is 1 g is 1 y rs f (MHz) f (MHz) 1 3 V DS =5V; V G2 =V. =15mA; T amb =25 C. Fig.15 Input admittance as a function of frequency; typical values. V DS =5V; V G2 =V. =15mA; T amb =25 C. Fig. Reverse transfer admittance and phase as a function of frequency; typical values. 1 2 MGT MGT591 y fs (ms) y fs ϕ fs y os (ms) 1 b os 1 ϕ fs g os f (MHz) 1 3 V DS =5V; V G2 =V. =15mA; T amb =25 C f (MHz) V DS =5V; V G2 =V. =15mA; T amb =25 C. Fig.17 Forward transfer admittance and phase as a function of frequency; typical values. Fig.1 Output admittance as a function of frequency; typical values. 21 Apr 25 9

10 BF123 scattering parameters V DS =5V; V G2-S =V; =15mA; T amb =25 C f (MHz) MAGNITUDE (ratio) s 11 s 21 s 12 s 22 ANGLE MAGNITUDE (ratio) ANGLE MAGNITUDE (ratio) ANGLE MAGNITUDE (ratio) ANGLE Apr 25 1

11 BF123 DYNAMIC CHARACTERISTICS AMPLIFIER b Common source; T amb =25 C; V G2-S =V; V DS =5V; = 12 ma; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT y fs forward transfer admittance pulsed; T j =25 C 25 3 ms C ig1-ss input capacitance at gate 1 f = 1 MHz pf C ig2-ss input capacitance at gate 2 f = 1 MHz pf C oss output capacitance f = 1 MHz.5 pf C rss reverse transfer capacitance f = 1 MHz 15 3 ff F noise figure f = 1.7 MHz; G S =2mS; B S = 9 11 db f=mhz; Y S =Y Sopt db f=mhz; Y S =Y Sopt db G tr power gain f = 2 MHz; G S =2mS; B S =B Sopt ; 3 db G L =.5 ms; B L =B Lopt ; note 1 f=mhz; G S =2mS; B S =B Sopt ; 3 db G L =1mS; B L =B Lopt ; note 1 f=mhz; G S = 3.3 ms; B S =B Sopt ; 25 db G L =1mS; B L =B Lopt ; note 1 X mod cross-modulation input level for k = 1%; f w =5MHz; f unw =6MHz; note2 at db AGC 9 db V at 1 db AGC 92 db V at db AGC 1 15 db V Notes 1. Calculated from measured s-parameters. 2. Measured in Fig.35 test circuit. 21 Apr 25 11

12 BF V G2-S = V 3.5 V 3 V MCD V 2 V 2 MCD953 V G1-S = 1.5 V 1. V 1.3 V 1.5 V 1.2 V 1.1 V 1 V 1 V.9 V V G1-S (V) V DS (V) V DS =5V. T j =25 C. Fig.19 Transfer characteristics; typical values. V G2-S =V. T j =25 C. Fig.2 Output characteristics; typical values. 1 I G1 (μa) V G2-S = V MCD V 3 V y fs (ms) 3 V G2-S = V MCD V 3 V V 2 V V V 1 2 V 1 V V G1-S (V) 12 2 V DS =5V. T j =25 C. V DS =5V. T j =25 C. Fig.21 Gate 1 current as a function of gate 1 voltage; typical values. Fig.22 Forward transfer admittance as a function of drain current; typical values. 21 Apr 25 12

13 BF123 2 MCD MCD I G1 (μa) V GG (V) V DS =5V; V G2-S =V. T j =25 C. V DS =5V; V G2-S =V; T j =25 C. R G1 =12k (connected to V GG ); see Fig.35. Fig.23 Drain current as a function of gate 1 current; typical values. Fig.2 Drain current as a function of gate 1 supply voltage (= V GG ); typical values MCD95 R G1 = 6 kω 2 kω 1 kω 12 kω 15 kω 1 kω 22 kω 12 MCD959 V GG = 5 V.5 V V 3.5 V 3 V 2 6 V GG = V DS (V) 2 6 V G2-S (V) V G2-S =V; T j =25 C. R G1 connected to V GG ; see Fig.35. V DS =5V; T j =25 C. R G1 =12k (connected to V GG ); see Fig.35. Fig.25 Drain current as a function of gate 1 (= V GG ) and drain supply voltage; typical values. Fig.26 Drain current as a function of gate 2 voltage; typical values. 21 Apr 25 13

14 BF123 I G1 (μa) 3 MCD96 V GG = 5 V.5 V handbook, gain halfpage reduction (db) 1 MCD961 V V 3 V V G2-S (V) VAGC (V) V DS =5V; T j =25 C. R G1 =12k (connected to V GG ); see Fig.35. V DS =5V; V GG =5V; R G1 = 12 k ; f = 5 MHz; T amb =25 C. Fig.27 Gate 1 current as a function of gate 2 voltage; typical values. Fig.2 Typical gain reduction as a function of the AGC voltage; see Fig MCD962 MCD963 V unw (dbμv) gain reduction (db) gain reduction (db) V DS =5V; V GG =5V; R G1 = 12 k ; f= 5 MHz; f unw =6MHz; T amb =25 C. Fig.29 Unwanted voltage for 1% cross-modulation as a function of gain reduction; typical values; see Fig.35. V DS =5V; V GG =5V; R G1 = 12 k ; f = 5 MHz; T amb =25 C. Fig.3 Drain current as a function of gain reduction; typical values; see Fig Apr 25 1

15 BF MGT MGT y is (ms) y rs (μs) ϕ rs ϕ rs 1 2 b is 1 1 y rs 1 g is f (MHz) V DS =5V; V G2 =V. =12mA; T amb =25 C f (MHz) 1 3 V DS =5V; V G2 =V. =12mA; T amb =25 C. Fig.31 Input admittance as a function of frequency; typical values. Fig.32 Reverse transfer admittance and phase as a function of frequency; typical values. 1 2 MGT MGT595 y fs (ms) y fs ϕ fs y os (ms) 1 b os 1 1 ϕ fs 1 1 g os f (MHz) 1 3 V DS =5V; V G2 =V. =12mA; T amb =25 C f (MHz) V DS =5V; V G2 =V. =12mA; T amb =25 C. Fig.33 Forward transfer admittance and phase as a function of frequency; typical values. Fig.3 Output admittance as a function of frequency; typical values. 21 Apr 25 15

16 BF123 handbook, full pagewidth V AGC R1 1 kω C1.7 nf C3.7 nf R GEN 5 Ω R2 5 Ω C2.7 nf R G1 DUT L1 2.2 μh C.7 nf R L 5 Ω V I V GG V DS MGS315 Fig.35 Cross-modulation test set-up (for one MOS-FET). scattering parameters V DS =5V; V G2-S =V; =12mA; T amb =25 C f (MHz) MAGNITUDE (ratio) s 11 s 21 s 12 s 22 ANGLE MAGNITUDE (ratio) ANGLE MAGNITUDE (ratio) ANGLE MAGNITUDE (ratio) ANGLE Apr 25

17 BF123 PACKAGE OUTLINE Plastic surface-mounted package; 6 leads SOT363 D B E A X y H E v M A 6 5 Q pin 1 index A A1 c e1 bp w M B Lp e detail X 1 2 mm scale DIMENSIONS (mm are the original dimensions) UNIT A A1 bp c D E e e max 1 H E Lp Q v w y mm OUTLINE VERSION REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION ISSUE DATE SOT363 SC Apr 25 17

18 BF123 DATA SHEET STATUS DOCUMENT PRODUCT STATUS (1) STATUS (2) DEFINITION Objective data sheet Development This document contains data from the objective specification for product development. Preliminary data sheet Qualification This document contains data from the preliminary specification. Product data sheet Production This document contains the product specification. Notes 1. Please consult the most recently issued document before initiating or completing a design. 2. The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL DEFINITIONS The information and data provided in a Product data sheet shall define the specification of the product as agreed between NXP Semiconductors and its customer, unless NXP Semiconductors and customer have explicitly agreed otherwise in writing. In no event however, shall an agreement be valid in which the NXP Semiconductors product is deemed to offer functions and qualities beyond those described in the Product data sheet. DISCLAIMERS Limited warranty and liability Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. In no event shall NXP Semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Notwithstanding any damages that customer might incur for any reason whatsoever, NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors. Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer s own risk. Applications Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned, as well as for the planned application and use of customer s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. 21 Apr 25 1

19 BF123 NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer s applications or products, or the application or use by customer s third party customer(s). Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer(s). NXP does not accept any liability in this respect. Limiting values Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 613) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and conditions of commercial sale NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NXP Semiconductors hereby expressly objects to applying the customer s general terms and conditions with regard to the purchase of NXP Semiconductors products by customer. No offer to sell or license Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Export control This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from national authorities. Quick reference data The Quick reference data is an extract of the product data given in the Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding. Non-automotive qualified products Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NXP Semiconductors warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond NXP Semiconductors specifications such use shall be solely at customer s own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors standard warranty and NXP Semiconductors product specifications. 21 Apr 25 19

20 provides High Performance Mixed Signal and Standard Product solutions that leverage its leading RF, Analog, Power Management, Interface, Security and Digital Processing expertise Customer notification This data sheet was changed to reflect the new company name NXP Semiconductors, including new legal definitions and disclaimers. No changes were made to the technical content, except for package outline drawings which were updated to the latest version. Contact information For additional information please visit: For sales offices addresses send to: NXP B.V. 21 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands R77/3/pp2 Date of release: 21 Apr 25