RW70U88R7F - Vishay Presicion Group

RS, NS

Vishay Dale

www.vishay.com

114 Document Number 30204

Revision 18-Oct-00

For technical questions, contact ww2bresistors@vishay.com

FEATURES

• High temperature coating

• Complete welded construction

• Meets applicable requirements of MIL-PRF-26

• Available in non-inductive styles (type NS) with

Aryton-Perry winding for lowest reactive components

• Excellent stability in operation

Wirewound Resistors, Military, MIL-PRF-26 Qualified,

Type RW, Precision Power, Silicone Coated

PARAMETER UNIT RS RESISTOR CHARACTERISTICS

Temperature Coefficient ppm/°C± 90 for below 1Ω, ± 50 for 1Ω to 9.9Ω, ± 20 for 10Ω and above

Dielectric Withstanding Voltage VAC 500 minimum for RS-1/8 thru RS-1A, 1000 minimum for all others

Short Time Overload – 5 x rated power for 5 seconds for 3.75 watt size and smaller,

10 x rated power for 5 seconds for 4 watt size and greater

Maximum Working Voltage V (P x R)1/2

Insulation Resistance Ω1000 Megohm minimum dry, 100 Megohm minimum after moisture test

Terminal Strength lb 5 minimum for RS-1/8 thru RS-1A, 10 minimum for all others

Solderability – MIL-PRF-26 type - Meets requirements of ANSI J-STD-002

Non Mil type - Terminals are 60/40 electro tin plated to facilitate soldering

Operating Temperature Range °C Characterisitic U = - 65/+ 250, Characteristic V = - 65/+ 350

Power Rating – Characteristic U - + 250°C max. hot spot temperature, ± 0.5% max. ∆R in 2000 hr. load life

Characteristic V - + 350°C max. hot spot temperature, ± 3.0% max. ∆R in 2000 hr. load life

TECHNICAL SPECIFICATIONS

ORDERING INFORMATION

RS-1A 10Ω1.0%

MODEL RESISTANCE TOLERANCE

Ω± %

STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE RANGE

MIL. RANGE SHOWN IN BOLD FACE

Ω

*Standard tolerance is ± 5% 1 ohm and above, ± 10% below 1 ohm.

**Vishay Dale RS models have two power ratings depending on operation temperature and stability requirements.

NOTE: Shaded area indicates most popular models.

± 0.05% thru ± .5%, ± 1%

TYPE ± 0.5% ± 3% & ± 5% ± .05% ± 0.1% ± .25% ± 3%, ± 5% g

RS-1/8 — .125 — — — — 0.1 - 950 0.15

RS-1/4 — .4 — 1 - 1k 0.499 - 1k 0.499 - 3.4k 0.1 - 3.4k 0.21

RS-1/2 — .75 — 1 - 1.3k 0.499 - 1.3k 0.499 - 4.9k 0.1 - 4.9k 0.23

RS-1A — 1.0 — 1 - 2.74k 0.499 - 2.74k 0.499 - 10.4k 0.1 - 10.4k 0.34

RS-1A-300 RW70 1.0 — — 0.499 - 2.74k 0.499 - 2.74k 0.1 - 2.74k 0.34

RS-1M — 1.0 — 1 - 1.32k 0.499 - 1.67k 0.499 - 6.85k 0.1 - 6.85k 0.30

RS-2 — 4.0 5.5 0.499 - 12.7k 0.499 - 12.7k 0.1 - 47.1k 0.1 - 47.1k 2.10

RS-2M — 3.0 — 0.499 - 4.49k 0.499 - 4.49k 0.1 - 18.74k 0.1 - 18.74k 0.65

RS-2B — 3.0 3.75 0.499 - 6.5k 0.499 - 6.5k 0.1 - 24.5k 0.1 - 24.5k 0.70

RS-2B-300 RW79 3.0 — — 0.499 - 6.49k 0.1 - 6.49k 0.1 - 6.49k 0.70

RS-2C — 2.5 3.25 0.499 - 8.6k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6

RS-2C-17 — 2.5 3.25 0.499 - 6.8k 0.499 - 8.6k 0.1 - 32.3k 0.1 - 32.3k 1.6

RS-2C-23* RW69 — 3.0 — — — 0.1 - 2.0k 1.6

RS-5 — 5.0 6.5 0.499 - 25.7k 0.499 - 25.7k 0.1 - 95.2k 0.1 - 95.2k 4.2

RS-5-69 RW74 5.0 — — 0.499 - 24.3k 0.1 - 24.3k 0.1 - 24.3k 4.2

RS-5-70* RW67 — 6.5 — — — 0.1 - 8.2k 4.2

RS-7 — 7.0 9.0 0.499 - 41.4k 0.499 - 41.4k 0.1 - 154k 0.1 - 154k 4.7

RS-10 — 10.0 13.0 0.499 - 73.4k 0.499 - 73.4k 0.1 - 273k 0.1 - 273k 9.0

RS-10-38 RW78 10.0 — — 0.499 - 71.5k 0.1 - 71.5k 0.1 - 71.5k 9.0

RS-10-39* RW68 — 11.0 — — — 0.1 - 20k 9.0

POWER RATING**

P25°C

WEIGHT

(Typical)

MODEL MIL-PRF-26

www.vishay.com

115

RS, NS

Vishay Dale

Document Number 30204

Revision 18-Oct-00 For technical questions, contact ww2bresistors@vishay.com

DIMENSIONS

Wirewound Resistors, Military, MIL-PRF-26 Qualified,

Type RW, Precision Power, Silicone Coated

MODEL DIMENSIONS in inches [millimeters]

MATERIAL SPECIFICATIONS

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

depending on resistance value

Core: Ceramic, steatite or alumina, depending on physical

size

Coating: Special high temperature silicone

Standard Terminals: T inned Copperweld®

End Caps: Stainless steel

Deviations for RS-1/8: Thermoset silicone molded

construction, endcaps will be nickel-silver alloy and terminals

will be tinned copper

Part Marking: DALE, Model, Wattage*, Value, Tolerance,

Date Code

1.50

[38.10]*

Min.

AB C

(Max.)**

RS-1/8 0.155 ± 0.015 — 0.065 ± 0.015 0.020 ± 0.002

[3.94 ± 0.381] [1.65 ± 0.381] [0.508 ± 0.051]

RS-1/4 0.250 ± 0.031 0.281 0.085 ± 0.020 0.020 ± 0.002

[6.35 ± 0.787] [7.14] [2.16 ± 0.508] [0.508 ± 0.051]

RS-1/2 0.312 ± 0.016 0.328 0.078 + 0.016 - 0.031 0.020 ± 0.002

[7.92 ± 0.406] [8.33] [1.98 + 0.406 - 0.787] [0.508 ± 0.051]

RS-1A 0.406 ± 0.031 0.437 0.094 ± 0.031 0.020 ± 0.002

RS-1A-300 [10.31 ± 0.787] [11.10] [2.39 ± 0.787] [0.508 ± 0.051]

RS-1M 0.285 ± 0.025 0.311 0.110 ± 0.015 0.020 ± 0.002

[7.24 ± 0.635] [7.90] [2.79 ± 0.381] [0.508 ± 0.051]

RS-2 0.625 ± 0.062 0.765 0.250 ± 0.031 0.040 ± 0.002

[15.88 ± 1.57] [19.43] [6.35 ± 0.787] [1.02 ± 0.051]

RS-2M 0.500 ± 0.062 0.562 0.185 ± 0.015 0.032 ± 0.002

[12.70 ± 1.57] [14.27] [4.70 ± 0.381] [0.813 ± 0.051]

RS-2B 0.560 ± 0.062 0.622 0.187 ± 0.031 0.032 ± 0.002

RS-2B-300 [14.22 ± 1.57] [15.80] [4.75 ± 0.787] [0.813 ± 0.051]

RS-2C 0.500 ± 0.062 0.593 0.218 ± 0.031 0.040 ± 0.002

[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [1.02 ± 0.051]

RS-2C-17 0.500 ± 0.062 0.593 0.218 ± 0.031 0.032 ± 0.002

[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [0.813 ± 0.051]

RS-2C-23 0.500 ± 0.062 0.593 0.218 ± 0.031 0.032 ± 0.002

[12.70 ± 1.57] [15.06] [5.54 ± 0.787] [0.813 ± 0.051]

RS-5 0.875 ± 0.062 1.0 0.312 ± 0.031 0.040 ± 0.002

[22.23 ± 1.57] [25.4] [7.92 ± 0.787] [1.02 ± 0.051]

RS-5-69 0.875 ± 0.062 0.937 0.312 ± 0.031 0.040 ± 0.002

[22.23 ± 1.57] [23.80] [7.92 ± 0.787] [1.02 ± 0.051]

RS-5-70 0.875 ± 0.062 1.0 0.312 ± 0.031 0.040 ± 0.002

[22.23 ± 1.57] [25.4] [7.92 ± 0.787] [1.02 ± 0.051]

RS-7 1.22 ± 0.062 1.28 0.312 ± 0.031 0.040 ± 0.002

[30.99 ± 1.57] [32.51] [7.92 ± 7.87] [1.02 ± 0.051]

RS-10 1.78 ± 0.062 1.87 0.375 ± 0.031 0.040 ± 0.002

[45.21 ± 1.57] [47.50] [9.53 ± 0.787] [1.02 ± 0.051]

RS-10-38 1.78 ± 0.062 1.84 0.375 ± 0.031 0.040 ± 0.002

[45.21 ± 1.57] [46.74] [9.53 ± 0.787] [1.02 ± 0.051]

RS-10-39 1.78 ± 0.062 1.87 0.375 ± 0.031 0.040 ± 0.002

[45.21 ± 1.57] [47.50] [9.53 ± 0.787] [1.02 ± 0.051]

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

a shorter length than shown.

NOTE: RS-1/8 terminal length will be 1.0" [25.4mm] minimum.

**B (Max.) dimension is clean lead to clean lead.

NS NON-INDUCTIVE

Models of equivalent physical and electrical specifications are

available with non-inductive (Aryton-Perry) winding. They are

identified by substituting the letter N for R in the model

number (NS-5, for example). Two conditions apply:

1. For NS models, divide maximum resistance values by two

2. Body O.D. on NS-2C may exceed that of the RS-2C by 010"

*All ∆R figures shown are maximum, based upon testing requirements per MIL-PRF-26.

PERFORMANCE*

TEST CONDITIONS OF TEST TEST LIMITS

Characteristic U Characteristic V

Thermal Shock Rated power applied until thermally stable, then a min. of 15 minutes at - 55°C± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R

Short T ime Overload

5 x rated power (3.75 watt and smaller), 10 x rated power (4 watt and larger) for 5 seconds

± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R

Dielectric Withstanding Voltage 500 minimum for RS-1/8 thru RS-1A, 1000 for all others, duration of 1 minute ± (0.1% + 0.05Ω) ∆R± (0.1% + 0.05Ω) ∆R

Low Temperature Storage - 65°C for 24 hours ± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R

High Temperature Exposure 250 hours at: U = + 250°C, V = + 350°C± (0.5% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R

Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (0.2% + 0.05Ω) ∆R± (2.0% + 0.05Ω) ∆R

Shock, Specified Pulse MIL-STD-202 Method 213, 100g's for 6 milliseconds, 10 shocks ± (0.1% + 0.05Ω) ∆R± (0.2% + 0.05Ω) ∆R

Vibration, High Frequency Frequency varied 10 to 2000Hz, 20g peak, 2 directions 6 hours each ± (0.1% + 0.05Ω) ∆R± (0.2% + 0.05Ω) ∆R

Load Life 2000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF” ± (0.5% + 0.05Ω) ∆R± (3.0% + 0.05Ω) ∆R

5 to 10 sec., 5 or 10 lb pull test (depending on size),

torsion test - 3 alternating directions, 360° each

Terminal Strength ± (0.1% + 0.05Ω) ∆R± (1.0% + 0.05Ω) ∆R

*Wattage marked on part will be "U" characteristic

Derating

120

100

0-65 -50 0 50 150 250 350

AMBIENT TEMPERATURE IN °C

RATED POWER IN %

CHAR. V

CHAR. U