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Axial Precision Wirewound Resistors
(500 & EC Series)


Axial Precision Wirewound ResistorsFEATURES
  • Resistance range: 1Ω to maximum listed
  • Standard Tolerances: ±.02%, ± .05%, ±.1%, ±.2%, ±.5%, & ±1%(all values)
    ±.005%, ±.01%, (10Ω and over, 500 Series)
  • Standard Temperature Coefficient:
    • 1Ω to <10Ω:   ± 25PPM
    • 10Ω to <100Ω:  ± 15PPM
    • 100Ω and over: ± 10PPM
    • (TC's available to  ± 2PPM (25Ω and over))
       
  • RoHS compliant, Pb-Free construction available
  • Operating Temperature range:  -65°C to 145°C
  • Temperature Compensating TC's from +80 through +6000 PPM
  • TC Matching to ±0.5 PPM/°C @ 25°C
  • Custom Designs Welcome and "high speed" design, providing minimal reactance and fast rise time. (Add 'H' prefix to style)

PERCENT OF RATED POWER
KRL Precision Wirewound Resistor Derating Curve

500 and EC Series resistors must be derated for tolerances below 0.1%, and for elevated temperatures.  Use the curve for the desired tolerance, and, knowing the maximum ambient temperature during use, determine the maximum allowed percentage of rated power from the graph.

Power Derating Graph

 

Diagram of resistor

Axial Lead Resistors - 500 Series
KRL
Style
MIL-R-93
MIL-R-39005
Dimensions
Power in Watts
Maximum Voltage
Maximum Resistance
Length
±.015
Diameter
±.015
Lead
AWG
MIL
125°C
COMM
125°C
†533
 
 
0.260
0.100
24
0.05
0.1
100
150K
†534
 
 
0.300
0.100
22
0.05
0.1
100
150K
†535
 
 
0.250
0.125
22
0.065
0.125
150
300K
536
 
 
0.312
0.125
22
0.075
0.15
200
400K
†537
 
 
0.375
0.125
22
0.1
0.2
200
500K
†538
 
 
0.375
0.187
22
0.125
0.25
300
1 Meg
539
 
 
0.250
0.187
22
0.115
0.225
250
550K
†540
 
RBR-74
0.500
0.187
22
0.175
0.35
300
1.5 Meg
550
 
RBR-75
0.295
0.250
22
0.125
0.25
200
1.5 Meg
†555
RB-56
RBR-56
0.375
0.250
20
0.175
0.35
300
1.5 Meg
†560
RB-55
RBR-55
0.500
0.250
20
0.25
0.5
400
2 Meg
†565
RB-54
RBR-54
0.750
0.250
20
.375
0.75
500
3.5 Meg
570
RB-53
RBR-53
0.750
0.375
20
0.45
0.9
600
4 Meg
575
RB-52
RBR-52
1.000
0.375
20
0.75
1.5
750
5 Meg
578
 
 
0.500
0.500
20
0.33
0.66
400
2 Meg
580
RB-57
RBR-57
1.000
0.500
20
0.85
1.75
850
10 Meg
585
RB-58
 
1.500
0.500
20
1
2
1.5KV
15 Meg
Economy Line Axial Lead Resistors - EC Series
KRL
Style
MIL-R-10509
Length
Diameter
Lead
AWG
Power in Watts
Maximum
Voltage
Maximum
Resistance
†EC-10
RN-55
0.250
0.125
22
0.25
200
100K
†EC-20
RN-60
0.375
0.125
22
0.4
300
150K
†EC-25
 
0.375
0.187
22
0.5
325
175K
†EC-30
RN-65
0.500
0.187
22
0.75
350
200K
EC-40
RN-70
0.750
0.250
20
1
400
300K
EC-50
RN-75
1.000
0.375
20
1.5
600
500K

†Indicates most popular types.

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