MIL-PRF-39007-7 Resistor, Fixed, Wire-Wound \(Power Type\), Nonestablished Reliability, Established Reliability, And Space Level Style Rwr78This specification covers the associated requirements for style RWR78, nonestablished reliability, established reliability, and space level, power type, wire-wound, fixed, resistor. These resistors are available with terminal types "S" \(solderable, inductively wound\), "W" \(weldable, inductively wound\), "N" \(solderable, noninductively wound\), and "Z" \(weldable, noninductively wound\).

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MIL-PRF-39007/7H

Table I. Resistance temperature characteristic.

Resistance range

Resistance temperature characteristic

(ohms)

(Reference to 25�C)

0.1≤R≤0.499

+650 ppm

0.499<R≤1.0

+400 ppm

1.0<R≤10

�50 ppm

10<R≤453

�30 ppm

�20 ppm

453<R

Inches

.002

0.05

.031

0.79

.032

0.81

.040

1.02

.062

1.57

.375

9.53

1.500

38.10

1.780

45.21

Standard

Dimensions

style

A �.062

B (min)

C �.002

D �.031

RWR78

1.780

1.500

.040

.375

NOTES:

1. Dimensions are in inches.

2. Metric equivalents are given for general information only.

3. Dimension A is clean lead to clean lead.

4. Lead concentric tolerance is to be measured at the point of lead egress from the resistor body to be

within .032 TIR.

5. Lead length for tape and reel packaging shall be 1 inch minimum.

FIGURE 1. Style RWR78 resistor.