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RESISTANCE RANGE
CUSTOM TOLERANCES
TCR CHARACTERISTIC
PRC's sub-miniature type SM “precisionpower” resistors offer the widest range ofohmic values anywhere.You can select any value or decimal partof an ohm from 0.02 to 4 Megohms.
±1%(Std.), ±0.5%, ±0.25%, ±0.1%For Closer Tol., see HR Series.
0±10ppm/°C for 100 andabove and 0±15ppm/°C below 100 .
To 0±2ppm/°C
*Must Specify Temp. Span of Operation.
Ω
ΩΩ
Standard:
Special:
VOLTAGE RATING
PRECISION POWER RATINGS
DC Voltage or Peak Voltage:The type SM’s high operating voltagewinding patterns eliminate dangerouscrossovers and potential problems usuallyassociated with standard style bobbins andmandrel designs. To calculate the safeoperating voltage for any resistance valuebelow the maximum listed,apply the formula: E= PR.
All standard ±1% tolerance type SMresistors are designed for continuous fullload operation at +25°C. Derated to zerowattage at +275°C (see Fig. #5 above).
ENGINEERING DATA:
1. 4.
5.
6.
7.
8.
SM041
SM062
SM063
SM094
SM076
SM156
SM1711
SM186
SM177
SM228
SM2812
SM3114
SM3726
PRC041
PRC062
PRC063
PRCSM 094
PRCSM 076
PRCSM 156
PRCSM 1711
PRCSM 186
PRCSM 177
PRCSM 228
PRCSM 2812
PRCSM 3114
PRC
SM 3726
TWO (2) TERMINALPRC
TYPE
For higher resistance values (at max. rated voltage) decrease max. power rating (P=E /R)For lower resistance values (at max. rated power) decrease max. voltage rating (E= PR)*Resistance values based upon max. power and max. voltage.
RW70
RW69
RW79
RW74
RW67
0.125W
0.25W
1W
1.125W
1.5W
2W
3W
3W
3W
5W
6.5W
10W
1.0
1.0
0.1
0.1
0.1
0.1
0.1
*0.025
0.1
*0.02
*0.02
0.1
*0.07
5K
17K
24K
40K
53K
90K
80K
80K
120K
200K
154K
156K
225K
10K
30K
80K
180K
400K
900K
480K
540K
720K
1 MEG
1.5 MEG
50K
4 MEG
25V
65V
110V
200V
245V
375V
670V
500V
500V
600V
1000V
1000V
1250V
6.35
6.35
7.92
10.31
12.7
13.49
20.62
12.7
14.27
15.88
22.86
25.4
45.21
(.250”)
(.250”)
(.312”)
(.406”)
(.500”)
(.531”)
(.812”)
(.500”)
(.562”)
(.625”)
(.900”)
(1.000”)
(1.780”)
1.52
2.03
2.03
2.92
2.29
4.47
4.83
5.26
4.83
6.10
7.92
8.43
10.03
(.060”)
(.080”)
(.080”)
(.115”)
(.090”)
(.176”)
(.190”)
(.207”)
(.190”)
(.240”)
(.312”)
(.332”)
(.395”)
.020”
020”
.020”
.025”
.020”
.028”
.028”
.028”
.028”
.032”
.032”
.032”
.032”
RWStylesMILR-26
MaxPowerRating(Watts)
*Min.Allowable
Resist.*(Ohms)
*Max.Allowable
Resist.*(Ohms)
Resist.(R=E /P)
Max.VoltageRating mm mm(ins.) (ins.)
Length Diameter
Body Dimensions ±.787mm (.031”)
LeadLength1.5”
Max.Diam.
±0.125”
* 0.02 to 0.1 and maximum resistance values available in non-standard physical sizes 0 to +.0625”.All low value 2-terminal designs are calibrated and tested at mid-point on lead unless otherwise specified.
Ω Ω
2.
3.
2
2
0.5W
RW78
INDUCTANCE
TERMINALS
PROTECTIVE SEAL
Inductively woundNon-inductive winding
is available, simply add suffixletter “N” to the end of part number.
Solderable hot-tinned pure copper leads.
SM resistors are coated in atough solvent resistant high-temperature siliconeformulation … with indeliblemarking.
Standard:Special:
Standard:
Sub-miniature high valuesToleranceTCR CharacteristicHigh voltage ratingLow EMF construction
......... to 4 Megohms............................................ to ±0.1%
......................... 0+10ppm/°C......................... to 1250 Volts
............. Vs. copper leads
ELECTRICAL & PHYSICAL SPECIFICATIONS
13
PRECISION RESISTOR CO., INC.10601 75TH Street North, Largo, Florida 33777-1421 U.S.A.Tel: 727-541-5771 Fax: 727-546-9515Email: sales@precisionresistor.comWeb Site: http://www.precisionresistor.com
ISSUE NO. 42
Fig. 5DERATING
CURVE
RESISTANCETol. ±1%
100
80
60
40
20
025 75 125 175 225 275
±1/20%
±1/10%
±1/4%
±1/2%
FO
PER
CE
NT
RA
TE
DPO
WE
R
AMBIENT TEMPERATURE IN °C.
FULL RATED POWER & CURRENT FOR ± 1% RES. TOL.BOTH MAX POWER & MAX CURRENT PUBLISHED MUST BE DE-RATED FOR TOLERANCES CLOSER THAN ± 1%
Prot from Precision Power SM Series
REVISED 11-10-11. SUPERSEDES ANY AND ALL PREVIOUS PUBLISHED ARTICLES.
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