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ESS, ESW, ESN, EGS, EGW, EGN

Vishay Dale

Document Number 30203

Revision 23-Sep-02

For technical questions, contact ww2bresistors@vishay.com

DIMENSIONS

B

1.50 [38.10]*

Min.

A

C

MIL-PRF-39007

DIMENSIONS - in inches [millimeters]

MODEL

A

B

C

RWR81

0.250

± 0.031

.085

± 0.020

0.020

± 0.0015

[6.35

± 0.787]

[2.16

± 0.508]

[0.508

± 0.038]

RWR82

0.312

± 0.016

0.078 + 0.016 - 0.031

0.020

± 0.0015

[7.92

± 0.406]

[1.98 + 0.406 - 0.787]

[0.508

± 0.038]

RWR80

0.406

± 0.031

0.094

± 0.031

0.020

± 0.0015

[10.31

± 0.787]

[2.39

± 0.787]

[0.508

± 0.038]

RWR71

0.812

± 0.062

0.187

± 0.031

0.032

± 0.002

[20.62

± 1.58]

[4.75

± 0.787]

[0.813

± 0.051]

RWR89

0.560

± 0.062

0.187

± 0.031

0.032

± 0.002

[14.22

± 1.58]

[4.75

± 0.787]

[0.813

± 0.051]

RWR74

0.875

± 0.062

0.312

± 0.031

0.040

± 0.002

[22.23

± 1.58]

[7.92

± 0.787]

[1.02

± 0.051]

RWR84

0.875

± 0.062

0.312

± 0.031

0.040

± 0.002

[22.23

± 1.58]

[7.92

± 0.787]

[1.02

± 0.051]

RWR78

1.780

± 0.062

0.375

± 0.031

0.040

± 0.002

[45.21

± 1.58]

[9.53

± 0.787]

[1.02

± 0.051]

MATERIAL SPECIFICATIONS

Element: Copper-nickel alloy or nickel-chrome alloy,

depending on resistance value

Core: Ceramic, Beryllium oxide, steatite or alumina,

depending on power requirement

Coating: Special high temperature silicone

Terminal and Winding: The terminal and the winding

are identified by a letter symbol in the military type

designation. Military Symbol:

S = Solderable, inductively wound

W = Weldable, inductively wound

N = Solderable, non-inductively wound

Z = Weldable, non-inductively wound

Weldable - Bare Nickel per MIL-STD-1276, Type N-1

End Caps: Stainless Steel

Part Marking: Source Code, JAN, Military PIN,

Date/Lot Code

APPLICABLE MIL-SPECIFICATION

MIL-PRF-39007: This is the military specification

covering axial lead established reliability power

wirewound resistors.

Vishay Dale ESS, ESW, EGS, EGW, ESN and EGN

resistors meet or exceed the electrical, environmental

and dimensional requirements of this specification.

PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

MIL-STD-2.2, Method 303

± (0.2% + 0.005Ω) ∆R

Short Time Overload

5 x rated power (RWR71, 80, 81, 89, 82), 10 x rated power (RWR74, 78, 84) for 5 seconds

± (0.2% + 0.005Ω) ∆R

Dielectric Withstanding Voltage

500Vrms (RWR80, 81, 82), 1000Vrms (RWR71, 74, 78, 84, 89), 1 minute duration

± (0.1% + 0.005Ω) ∆R

Low Temperature Storage

- 65

°C for 24 hours

± (0.1% + 0.005Ω) ∆R

High Temperature Exposure

250

°C for 2000 hours

± (1.0% + 0.005Ω) ∆R*

Moisture Resistance

MIL-STD-202, Method 106

± (0.2% + 0.005Ω) ∆R

Shock, Specified Pulse

MIL-STD-202, Method 205, Condition C

± (0.1% + 0.005Ω) ∆R

Vibration, High Frequency

MIL-STD-202, Method 204, Condition D

± (0.1% + 0.005Ω) ∆R

Load Life

2000 hours at rated power, + 25

°C, 1.5 hours “ON”, 0.5 hours “OFF”

± (0.5% + 0.005Ω) ∆R

Extended Life

10,000 hours at rated power, + 25

°C, 1.5 hours “ON”, 0.5 hours “OFF”

± (1.0% + 0.005Ω) ∆R

MIL-STD-202, Method 211, Condition A and C

5 pound (RWR80, 81, 82), 10 pound (RWR71, 74, 78, 84, 89)

TECHNICAL SPECIFICATIONS

PARAMETER

UNIT

ESS, ESW, ESN, EGS, EGW, EGN RESISTOR CHARACTERISTICS

Temperature Coefficient

ppm/

°C

± 650 for 0.1Ω to 0.499Ω, ± 400 for 0.505Ω to 1Ω, ± 50 for 1.1Ω to 10Ω, ± 20 for 10Ω and above

Dielectric Withstanding Voltage

500 minimum for 2 watt and smaller, 1000 minimum for 3 watt and larger

Short Time Overload

-

5 x rated power for 5 seconds for 3 watt size and smaller,

10 x rated power for 5 seconds for 5 watt size and greater

Maximum Working Voltage

V

Insulation Resistance

Ω

1000 Megohm minimum dry, 100 Megohm minimum after moisture test

Terminal Strength

lb

5 minimum for 2 watt and smaller, 10 minimum for 3 watt and larger

Solderability

-

Meets requirements of ANSI J-STD-002

Operating Temperature Range

°C

- 65/+ 250

Wirewound Resistors, Military/Established Reliability

MIL-PRF-39007 Qualified, Type RWR, R Level

*For resistance values above 100 ohms, Test Limit is

± 1.0%.

Terminal Strength

± (0.1% + 0.005Ω) ∆R

*On some standard reel pack methods, the leads may be

trimmed to a shorter length than shown.

Derating

-65-50

0

50

150

250

AMBIENT TEMPERATURE IN

25

0

20

40

60

80

100

120