Double-Sided Chip Resistors

Transcription

1 Double-Sided Two parallel resistance elements in a single chip Excellent pulse withstand performance Laser trimmed up to 0.5% tolerance Enhanced working voltage Enhanced power rating Pb-free terminations Electrical Data P o w e 7 0 C 2 s e c o n d o v e r l o a d p o w e 2 5 C S h o r t p u l s e p e r f o r m a n c e R e s i s t a n c e r a n g e T o l e r a n c e L E V T C R O p e r a t i n g t e m p e r a t u r e D i e l e c t r i c w i t h s t a n d v o l t a g e T h e r m a l I m p e d a n c e W a t t s W a t t s O h m s % V o l t s p p m / C C V o l t s C / W S e e g r a p h s R 0 t o 4 M 7 0 R t o M : 0. 5, A l l v a l u e s :, 5 < 0 R : > _ 0 R : t o Pad & trace area for rated power* mm V a l u e s E 2 4 o r 9 6 p r e f e r r e d - o t h e r v a l u e s t o s p e c i a l o r d e r Physical Data *Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB Dimensions (mm) & Weight (g) L W T max A B min C Wt. C ±0.4.6± ± ± T ± ± ± ± A B L A W ± ± ± ± Wrap-around terminations (3 faces) Construction Thick film resistor material, overglaze and organic protection are screen printed on a 96% alumina substrate. Wrap-around terminations have an electroplated nickel barrier and Pb-free solderable coating, this ensures excellent leach resistance properties and solderability. Marking Components are not marked. Reels are marked with type, value, tolerance, date code and quantity. Solvent Resistance The body protection is resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn s own data and is considered accurate at time of going to print. Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) Facsimile: +44 (0) info@welwyn-tt.com Website: A subsidiary of TT electronics plc

2 Performance Data M a x i m u m T y p i c a l Load at rated power: 000 hours at 70 C R % D e r a t i n g from rated p o w e r a t 7 0 C Z e r o a t 5 5 C Overload: 6.25 x rated power for 2 seconds R % 0. Shelf life test: 2 months at room temperature R % Dry heat: 000 hours at 55 C R % 0. 2 Long term damp heat R % Temperature rapid change R % Resistance to solder heat R % Note: A 0.0 Ohm addition to be added to the performance of all resistors <0 Ohms. Pulse Performance Data Lightning Surge Resistors are tested in.2/50µs Lightning Surge accordance with IEC using both.2/50µs and 0/700µs pulse shapes. 0 pulses are applied. The limit of acceptance is a shift in resistance of less than % from the initial value. 0,000, ,000 0,000 00,000,000,000 0,000,000 0/700µs Lightning Surge 0,000, ,000 0,000 00,000,000,000 0,000,000 Telephone: +44 (0) Facsimile: +44 (0) info@welwyn-tt.com Website:

3 DSC252 - Bellcore GR089 Lightning Surge 0,000,000 2/0us 0/000us ,000 0,000 00,000,000,000 0,000,000 Single Pulse The single impulse graph is the Single Pulse result of 50 impulses of rectangular,000 shape applied at one-minute intervals. The limit of acceptance was a shift in resistance of less than % from the initial value. Peak Power (W) Pulse Duration (s) Continuous Load Due to Repetitive Pulses The continuous load graph was,000 Continuous Pulses obtained by applying repetitive rectangular pulses where the pulse period was adjusted so that the average power dissipated in the resistor was equal to its rated power at 70 C. Again the limit of acceptance was a shift in resistance of less than % from the initial value. Peak Power (W) Pulse Duration (s) Telephone: +44 (0) Facsimile: +44 (0) info@welwyn-tt.com Website:

4 Thermal Performance Data Temperature Derating Curve 25 % of Rated Power Ambient Temperature/ C Temperature Rise Curves Temperature Rise/ C Power Dissipation/W Packaging 206 DSC series resistors are supplied on 8mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; and 252 DSC series resistors are supplied on 2mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 200 : 3000pcs; 252 : 800pcs. Reels of 000pcs are available on request. T 2 P 0 Marking (Both sides) 33 ±.0 Wr T D 0 P 2 E 3 ± ± 2 80 ± 2 B 0 G F W T A 0 D 2.5 ± ± 0.5 K 0 P Tape and reel dimensions (mm) W P P0 P2 D0 D E F A0 B0 K0 T T T2 ±0.3 ±0. ±0. ±0.05 ±0. ±0.2 ±0. ±0.05 ±0. ±0. ±0. ±0.05 nom ± Telephone: +44 (0) Facsimile: +44 (0) info@welwyn-tt.com Website:

5 Application Notes DSC resistors are ideally suited for handling by automatic methods due to their rectangular shape and the small dimensional tolerances. Electrical connection to a ceramic substrate or to a printed circuit board can be made by reflow or wave soldering of wrap-around terminations. Wrap-around terminations provide good leach properties and ensure reliable contact. Due to the robust construction, the DSC can be immersed in the solder bath for 30 seconds at 260 C. This enables the resistor to be mounted on one side Ordering Procedure Specify type reference etc as shown in this example of DSC252 0K ohms %. Type DSC 252-0K F T 8 Size Value (use IEC62 code) of a printed circuit board and wire-leaded components applied on the other side. DSC is compatible with typical Pb-free soldering materials and temperature profiles DSC resistors themselves can operate at a maximum temperature of 55 C. For soldered resistors, the joint temperature should not exceed 0 C. This condition is met when the stated power levels at 70 C and recommended pad and trace areas are used. Allowance should be made if smaller areas of copper are used. Tolerance (use IEC62 code) D 0.5% F % J 5% T3 206 or /reel Tape T /reel Packing Standard Telephone: +44 (0) Facsimile: +44 (0) info@welwyn-tt.com Website: