Metal Film Fusing Resistors Type: ERQ ERQZ (.,. W, W, coating type ) Features ccurate fusing Small size and lightweight Uniform quality, consistent per for mance and reliability Flame retardant, utilizing exclusive silicon insulation material Reference Standard EIJ RC-22 RoHS compliant Explanation of Part Numbers 2 3 4 6 7 8 9 2 E R Q 2 B J Product Code Metal Film Fusing Resistors Power Rating at 7 C amb. 4 2 2.. W W Special Feature Z B Z Standard Less than 2 Ω Standard Less than 2 Ω Resistance Tolerance J ± % Resistance Value The first two digits are significant figures of resistance and the third one denotes number of zeros following.decimal point is expressed by R as 2.2=2R2. Suffix for Packaging and/or Cut & Formed Leads Nil P P S E W E Std.bulk packing P type cut & formed P S type cut & formed Radial Taped & Box Radial Taped & Box The above example shows a standard Metal Film Fusing Resistors, pow er rat ing, resistance val ue of Ω, tolerance of ± %, and pack age of stan dard bulk pack ing. Construction Metal alloy film Lead wire Spiraling turns Insulative lacquer Ceramic core Marking End cap Sep. 24
Ratings Part No. Power Rating at 7 C (W) Maximum Open Circuit Voltage () (V) Maximum Overload Voltage Dielectric Withstanding Voltage (V) Resistance Tol er ance (%) Resistance Range (Ω) min. max. Standard T.C.R. ( -6 Resistance / C) Values Marking Method on Body Mass (Weight) [g/pc.] ERQ4Z..8 Color.2 C 3 J (± ) ±3 E24.24 ERQ4 2. 47 code ERQ2Z..8 Stamp. 2 3 times of C 3 J (± ) ±3 E24.32 ERQ2 2. 6 Color code rated ERQZ 2 voltage (2)..8 C 6 J (± ) ±3 E24 Stamp.64 ERQB 2. 6 ERQ2Z..8 2 2 C J (± ) ±3 E24 Stamp.4 ERQ2B 2. 6 () Maximum Open Circuit Voltage: Referring to the maximum value of the voltage applied between terminals of the resistor when the resistor is opened in an electric circuit times power rating or voltage specified above whichever less is regarded as the maximum open circuit voltage. (2) Rated Continuous Working Voltage (RCWV) shall be determined from RCWV= Power Rating Resistance Value Power Derating Curve For resistors operated in ambient temperatures above 7 C, power rating shall be derated in accordance with the figure on the right. Rated load (%) 2 8 6 4 2 3 C 7 C ERQ4 ERQ2 ERQ ERQ2 C 3 C 6 4 2 2 4 6 8 2 4 6 8 22 mbient temperature ( C) Performance Spec i fi ca tions Characteristics Specifi cations Test Methods Rated Power Res. Value (Ω) Limit Fusing Characteristics.. W W.. W W to.8 2 to 9. Open within 3 seconds at 3 times the Open within 3 seconds at 2 times the Open within 3 seconds at 6 times the. to 47 Open within. W 3 seconds at W to 6 2 times the The test potential shall be preadjusted using a dummy re sis tor and then be subjected to the test specimens. The potential shall be readjusted within two seconds to reach the exact value of specified current. This test shall be made under the conditions at 2 C and 6 % RH (or at a temperature of C to 3 C and 4 to 8 % RH, only when any doubt may not be caused), and the use of sta bi lized pow er source is sug gest ed. Fus ing time shall be mea sured as the duration un til the circuit cur rent is de creased to a / the initial test current or less. Sep. 24
Dimensions in mm (not to scale) Part No. L D k d l L l fd ERQ4 6.3 +. 2.3 ±. 3. ±3..6 ±.. fd ERQ2 9. +. 2.8 ±. 3. ±3..6 ±.. ERQ 2. +. 4. ±. 3. ±3..8 ±.. ERQ2. ±.. ±. 38. ±3..8 ±. Explanation of Marking Type ERQ4, ERQ2 (.,. W) Type ERQ, ERQ2 (W, 2W) st significant figure 2nd significant figure White color shows Fuse Resistor Q Shows Fuse Resistor Symbol Power rating Q W ΩJ 7 Manufacturing Series No. Multipier Resistance tolerance Resistance value and tolerance Date code (Year, Month, Week) Cut & Formed Type ERQ J P ERQ ZJ P S L f.6±. fd h 3 max..8.2±.2 4.±. Power Rating Standard Part No. at 7 C Q ty/packing (W) (pcs.) L D S h ERQ4 J P.2 2, 6.3 +.. 2.3 ±.. ±. 4. ±. ERQ2 J P. 2, 9. +.. 2.8 ±. 2. ±. 4. ±. ERQ BJP S ERQ ZJP S S L f.8±. fd h 3. max...4±.2 4.±. Power Rating Standard Part No. at 7 C Q ty/packing (W) (pcs.) L D S h ERQ JP S, 2. +.. 4. ±.. ±. 6. ±. ERQ2 JP S 2,. ±.. ±. 2. ±2. 6. ±. Sep. 24
For Panasert u to mat ic Insertion Machine Radial Taped & Box ERQ J E ERQ ZJ E (4/4Z, 2/2Z, B/Z) Insulated Lead P P 2 D H F P H fd W W P fd P 2.7±. W 8.±. 4/4Z 2 max. 4/4Z 6.3 +.6.3 4/4Z 2.3±. P 2.7±.3 W 9.±. H 2/2Z. max. 2/2Z 9. +. D 2/2Z 2.8±. P 3.8±.7 B/Z 9 max. B/Z 2. +. B/Z 4.±. P 2 6.3±. H 6.±. d.6±. F.±.8 D 4.±.2.. Radial Tape Packaging Methods b Marking a c Part Number ERQ4J E ERQ4ZJ E ERQ2J E ERQ2ZJ E ERQBJ E ERQZJ E a b c Standard Quantity (pcs./box) 46 3 33 2, pcs./box 46 3 33 2, pcs./box 49 33, pcs./box For Panasert u to mat ic Insertion Machine Radial Taped & Box ERQ /ZJW E (4/4Z, 2/2Z, B/Z) P P B P2 F fd P fd H H fd W W P 4/4Z 2.7±. 4/4Z 6. +.6 2/2Z, B/Z 3.±. H 2/2Z 6. +. 4/4Z 2.7±.3 B/Z 6. +. P 2/2Z, B/Z.±.3 D 4.±.2 4/4Z 6.3±. 4/4Z 6.3 +.6.3 P 2/2Z, B/Z 7.±. 2/2Z 9. +. 4/4Z 3.8±.7 B/Z 2. +.. P 2 2/2Z, B/Z 3.7±. 4/4Z.2 max. F 4/4Z. +.6 B 2/2Z 4 max. 2/2Z, B/Z 7. +.6 B/Z 7 max. W 8.±..2.2 4/4Z 2.3 +. W 9.±. D 2/2Z 2.8±. 4/4Z 6.±. B/Z 4.±. H 2/2Z 8.±. 4/4Z.6±. d B/Z 8.±. 2/2Z, B/Z.8±...3 Sep. 24
Fusing Characteristics (Constant Voltage Cir cuit) This data is for reference only, specifications should be verified in written form with the engineering division. ERQ4 2. to 9. (Ω) ERQ2 2. to 9. (Ω) to 47 (Ω) to 6 (Ω) 3 3 7 9 2 6 2 2 3 7 9 2 6 2 2 3 ERQB 2. to 9. (Ω) ERQ2B 2. to 9. (Ω) to 6 (Ω) to 6 (Ω) 3 3 7 9 2 6 2 2 3 7 9 2 6 2 2 3 Hot Spot Temperature (for reference) 6 Temperature rise T (K) 4 3 2B B 2 4 Measuring point 2 3 4 6 7 8 9 2 Sep. 24
Safety Precautions The following are precautions for individual products. Please also refer to the common precautions for Fixed Resistors in this catalog.. Checking the fusing conditions ) Fusing characteristics differ depending on the type, shape, and resistance. Check the fusing conditions be fore selecting the type of Metal Film Fusing Re sis tors (hereafter called the fusing resistor) to be used. 2) Use the fusing resistors under the maximum open circuit voltage. Otherwise, arc ing may oc cur when a volt age much higher than the rated one is applied in the event of an abnormality in the circuit, or when a high volt age is applied after fus ing. 3) Under abnormal conditions of a constant voltage circuit, a current of about 2 or 3 times the initial abnormal current passes through, accelerating the speed at which the fusing resistors blows. When using a constant current circuit, carefully check the conditions because the fusing resistors may not blow in a constant cur rent circuit. 2. Checking for pulse voltage, impact voltage, and transient voltage Make sure to evaluate and check the fusing resistors mounted on your product if they are to be mounted on a circuit that generates an impact voltage, or if there is a possibility that the tran sient phenomenon (sig nifi cant ly high voltage applied in a short time) may oc cur or that a pulse voltage with a high peak volt age may be ap plied. Make sure to consult our sales staff before using the fusing resistors under spe cial con di tions. 3. Conditions of use in a steady state Make sure that the load conditions have a suffi cient allowance for the power de r at ing curve. The char ac ter is tics of the fusing resistors are set by using a constant voltage circuit. 4. The solvent resistance of the fusing resistors is not assured. If you use a solvent for clean ing after soldering or other processes, make sure to consult our sales staff before use and per form a prior test and evaluation to ensure that the solvent will not affect the re li abil i ty of the fusing resistors. (Data for Reference) Pulse Char ac ter is tics (Usual) Pp (Vp) t T P P V P t T V R P R V p max. : Pulse limit power (W) : Pulse limit voltage (V) : Pulse continuous time (s) : Period (s) : Rated voltage (V) : Rated power (W) : Resistance value (Ω) : Max. pulse limit voltage (V) Withstand pulse limit power is calculated by the next meth od. P P = K P T/t V P = K P R T/t Reference to the right about a fixed number of V P max. Part No. K Vp max. (V) ERQ4.6 ERQ2.6 2 ERQB.6 2 ERQ2B.4 2 T>(s) T=(s) T/t> T/t= P P<P P stands for P P (V P<V R V R stands for V P) dded voltage<v p max. P P or V P is reference value Conditions : Pulse added time= h, Resistance change=± % Room temperature Sep. 24