pulse w ithstanding chip resistors pwc series s excellent pulse withstand performance s improved working voltage s improved power rating s standard chip sizes (0805 to 2512) s custom designs available general note welwyn components 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. ? welwyn components limited bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com website: www.welwyn-tt.com electrical data 07. 08 a subsidiary of tt electronics plc 2152 0102 6021 5080 ez i s 5.1 57.0 33.0 521 . 0 w c 0 7@ r ewo p m01 o t 0r1 s mh o egna r e cna t s i s er 5 ,1 : seul av l la ,5.0 :m1 ot r01 % ecnare lot 005 004 002 051 v ve l 002 : r01< c / mp p rct 10r:100 551+ o t 55 - c erutarepmet gni tarepo thermal impedance c/w 220 160 80 50 mm *ae r a e c a r t / dap 2 40 50 60 100 r ed r o l a i c ep s o t s eu l a v r eh t o de r r e f e r p 69e r o 42e s eu l av tseuqer no elbal iava eton noi tac i lppa l luf - shparg ees y t i l i bapa c e s l up 37 physical data 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 solder 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 resitance the body protection is resistant to all normal industrial cleaning solvents suitable for printed circuits. dimensions of pwc resistors are given below in mm and weight in g l w t max a b c wt. 0805 2.00.3 1.250.2 0.6 0.30.15 0.9 min 0.30.1 0.009 1206 3.20.4 1.60.2 0.7 0.40.2 1.7 min 0.40.15 0.020 2010 5.10.3 2.50.2 0.8 0.60.3 3.0 min 0.60.25 0.036 2512 6.50.3 3.20.2 0.8 0.60.3 4.4 min 0.60.25 0.055 t w a a b l wrap-around terminations (3 faces) *recommended minimum pad & adjacent trace area for each termination for rated power dissipation on fr4 pcb welwyn components 12. 08
pulse w ithstanding chip resistors pwc series ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com w ebsite: www .welwyn-tt.com 07. 08 performance data l a c i p y t m u m i x a m e z i s load at rated power: 1000 hours at 70c ? 5 2 . 0 1 % r shelf life test: 12 months at r oom temperatur e ? 2 0 . 0 1 . 0 % r c 5 5 1 t a o r e z c 0 7 t a r e w o p d e t a r m o r f g n i t a r e d overload: 6.25 x rated power for 2 seconds ? 1 . 0 1 % r dry heat: 1000 hours at 155c ? 2 . 0 1 % r long term damp heat ? 5 2 . 0 1 % r t emperatur e rapid change ? 5 0 . 0 5 2 . 0 % r resistance to solder heat ? 5 0 . 0 5 2 . 0 % r 0 0 5 s t l o v f o o r p e g a t l o v note: a 0.01 ohm addition to be added to the performance of all r esistors <10 ohms. w elwyn components pulse performance data 1.2/50 s lightning surge 10 100 1000 10000 1 10 100 1000 10000 100000 1000000 10000000 v alue (ohms) peak voltage (volts) 0805 1206 2010 2512 10/700 s lightning surge 10 100 1000 10000 1 10 100 1000 10000 100000 1000000 10000000 v alue (ohms) peak v oltage (v olts) 0805 1206 2010 2512 lightning surge lightning surge resistors ar e tested in accor dance with iec 60 115-1 using both 1.2/50s and 10/700s pulse shapes. 10 pulses are applied. the limit of acceptance is a shift in resistance of less than 1% from the initial value. 12. 08
pulse w ithsta ndin g chip r e s i sto r s p w c s e rie s ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com w ebsite: www .welwyn-tt.com 07.08 pulse perfo rma nce dat a w elwyn components single pulse 1 10 100 1000 1 0.1 0.01 0.001 0.0001 pulse duration ti (s) pulse power p (w) 0805 1206 2010 2512 continuous pulses 0.1 1 10 100 1 0.1 0.01 0.001 0.0001 pulse duration ti (s) pulse power p (w) 0805 1206 2010 2512 pulse v oltage 10 100 1000 10000 1 0.1 0.01 0.001 0.0001 pulse duration ti (s) pulse v oltage (v olts) 0805 1206 2010 2512 single impulse the single impulse graph is the r esult of 50 impulses of r ectangular shape applied at one minute intervals. the limit of acceptance was a shift in r esistance of less than 1% fr om the initial value. continuous load due to repetitive pulses the continuous load grpah was obtained by applying r epetitive r ectangular pulses wher e the pulse period was adjusted so that the average power dissipated in the r esistor was equal to its rated power at 70c. again the limit of acceptance was a shift in r esistance of less than 1% fr om the initial value. 12. 08
t emperatur e derating curve 125 ambient t emperatur e / c % of rated power 75 50 25 0 100 5 5 1 0 7 5 1 - pulse w ithstanding chip resistors pwc series ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com w ebsite: www .welwyn-tt.com thermal performance data 12. 08 packaging 0805 and 1206 pwc series r esistors ar e supplied on 8mm carrier tape and 7 inch r eels as per iec 286-3, quantity per r eel; 3000. 2010 and 2512 pwc series r esistors ar e supplied on 12mm carrier tape and 7 inch r eels as per iec 286-3, quantity per r eel; 2010 : 3000pcs; 2512 : 1800pcs. reels of 1000pcs ar e available on r equest. pwc r esistors ar e ideally suited for handling by automatic methods due to their r ectangular shape and the small dimensional tolerances. electrical connection to a ceramic substrate or to a printed cir cuit boar d can be made by r eflow or wave soldering of wrap-ar ound terminations. w rap-ar ound terminations pr ovide good leach pr operties and ensur e r eliable contact. due to the r obust construction, the pwc can be immersed in the solder bath for 30 seconds at 260c. this enables the r esistor to be mounted on one side of a printed cir cuit boar d and wir e-leaded components applied on the other side. pwc r esistors themselves can operate at a maximum temperatur e of 155c. for solder ed r esistors, the joint temperatur e should not exceed 110c. this condition is met when the stated power levels at 70c and r ecommended pad and trace ar eas ar e used. allowance should be made if smaller ar eas of copper ar e used. a full application note on the pwc series is available. o r dering p r ocedur e specify type r efer ence etc as shown in this example of pwc2512 10k ohms 1%. t emperatur e rise curves 80 power dissipation /w t emperatur e rise / c 60 40 20 0 0 0.5 1 1.5 0805 1206 2010 2512 application notes 2.5 0.5 13 0.5 33 1.0 marking 0.8 0.15 80 2 178 2 9.0 8mm tape: 9mm 0.5 12mm tape: 13mm 0.5 + 0.1 - 0.15 p 1 a 0 b 0 d 1 d 0 p 0 p 2 g f w e t 2 t 1 k 0 t t ape dimensions in mm w p1 p0 p2 d0 d1 e f a0 b0 k0 t t1 t2 0.3 0.1 0.1 0.05 0.1 0.2 0.1 0.05 0.1 0.1 0.1 0.05 nom 0.15 0805 8 4 4 2 1.5 1 1.75 3.5 1.65 2.45 0.8 0.2 0.05 1.1 1206 8 4 4 2 1.5 1 1.75 3.5 1.95 3.55 1.0 0.2 0.05 1.3 2010 12 4 4 2 1.5 1.5 1.75 5.5 2.79 5.89 0.91 0.28 0.06 1.21 2512 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45 t ype pwc 2512 - 10k f size v alue (use iec62 code) t olerance (use iec62 code) d 0.5% f 1% j 5% w elwyn components
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