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WH/WN Series

WH/WN Series

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WH/WN Series

Product catalog summary

Features

The WH series is a precision series, while the WN series uses Aryton Perry winding for non-inductive properties with inductance less than 1nH at 1MHz.
Designed to meet MIL-R-26F and MIL-STD-202 standards.
Manufactured using CNC machine tools for consistent product quality.
Encapsulated with epoxy molding compound.

Characteristics

Ceramic Core: CeramTec Rubalit® 85% alumina.
End Caps: Stainless steel, precision formed.
Leads: Copper wire, 100% Sn (lead-free) coated.
Resistance Wire: ISAOHM® wire with TC ±20ppm/°C.
Encapsulation: SUMICON 1100/1200 Epoxy molding compound.
Standard Tolerance: D (0.5%), F (1.0%), J (5.0%).
Temperature Coefficient: ±90 for 0.100Ω-0.99Ω, ±50 for 1.00Ω-10.00Ω, ±20 for >10.00Ω.
Maximum Working Voltage: (PxR)^1/2.
Derating: Linearly from 100% at +70°C to 0% at +150°C.
Operating Temperature: -55°C to +150°C.

Series Specifications

Power Rating and Resistance Range:
- WHA: 0.5 watts, 0.100 - 1.0K Ω.
- WNA: 0.100 - 250 Ω.
- WHB: 1 watt, 0.100 - 4.0K Ω.
- WNB: 0.100 - 1.0K Ω.
- WHC: 2 watts, 0.10 - 8.0K Ω.
- WNC: 0.10 - 2.0K Ω.
- WHD: 3 watts, 0.10 - 25K Ω.
- WND: 0.10 - 5.0K Ω.
- WHE: 5 watts, 0.10 - 50K Ω.
- WNE: 0.10 - 10K Ω.

Dimensions

Type WH/NA: 0.5 watt, L: 5.08 mm, D: 2.54 mm, d: 0.60 mm.
Type WH/NB: 1 watt, L: 7.00 mm, D: 3.30 mm, d: 0.60 mm.
Type WH/NC: 2 watts, L: 11.4 mm, D: 4.57 mm, d: 0.80 mm.
Type WH/ND: 3 watts, L: 13.54 mm, D: 5.50 mm, d: 0.80 mm.
Type WH/NE: 5 watts, L: 20.00 mm, D: 7.50 mm, d: 1.00 mm.

Performance Characteristics

Thermal Shock: Tested in an environmental chamber from -55°C to 150°C, 5 cycles.
Short-time Overload: Overload voltage 5x rated wattage for 5 seconds.
Solderability: Bath temperature 260°C, immersion time 5 seconds.
Resistance to Solder Heat: Bath temperature 260°C, immersion time 5 seconds.
Dielectric Withstanding Voltage: Test voltage >500 volts rms for 1 minute.
Insulation Resistance: Test voltage 500 volts rms for 1 minute, >109Ω.
High Temperature Exposure: Ambient temperature of 175°C for 250 hours.
Low Temperature Storage: Temperature of -65°C for 24 hours.
Life Test: Temperature at 70°C, rated DC continuous working voltage applied for 1000 hours.

Ordering Information

Wattage options: 0.5, 1.0, 2.0, 3.0, 5.0.
Series options: WHA, WNA, WHB, WNB, WHC, WNC, WHD, WND, WHE, WNE.
Ohms range from 0.1 to 25K.
Tolerance options: F (1%), J (5%), D (0.5%).
Package options: T (Tape), blank (25pc pack).
RoHS compliant.

Catalog excerpts

WH/WN SeriesMiniature Molded Wirewound •WH precision series • WN Aryton Perry winding Non-Inductive series: Inductance <1nH at 1MHZ test, • Designed to meet MIL-R-26F, MIL-STD-202 standard requirements • Manufacturing process -Wire winding/ Spot Welding- by Computer Numerical Control (CNC) machine tools to ensure consistency of product quality. • Encapsulated by epoxy molding compound • Advanced IC encapsulation mold/die technologies Power Resistance Rating Range Weight Ceramic Core CeramTec Rubalit® 85% alumina End Caps Stainless steel, precision formed Leads Copper wire,100% Sn (lead free) coated Resistance Wire ISAOHM® wire TC ±20ppm/°C Encapsulation SUMICON 1100/1200 Epoxy molding compound for IC encapsulation Standard Tolerance D (0.5%), F (1.0%), J (5.0%) Temperature ±90 for 0.100Q-0.99Q, ±50 for Coefficient (ppm/°C) 1.00Q-10.00Q, ±20 for >10.00Q Maximum Working (PxR)1/2 Voltage Derating Linearly from 100% @ +70°C to 0% @ +150°C. Operating Temp -55°C to +150°C Width Pitch Diam. reel Type Wattage L D d 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.

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PERFORMANCE CHARACTERISTiCS Test Conditions of Test Performance Thermal shock Environmental chamber, -55°C +0°C, -3°C to 150°C +3°C, -0°C, ±(1.0% + 0.5mQ)AR 5 cycles, minimum 15 min. at each extreme Short-time overload Overload voltage 5x rated wattage for 5 sec. ±(0.5% + 0.5mQ)AR Solderability Bath temp. 260°C ±5°, immersion time 5 sec. ±0.5, JIS C 5201 >90% of contact face Resistance to solder Bath temp. 260°C ±5°, immersion time 5 sec. ±0.5, JIS C 5201 ±(0.5% + 0.5mQ)AR heat 4.18 Dielectric withstanding Magnitude of test voltage >500 volts rms.; duration 1 min. Pass voltage...

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Ohmite Catalog Revised October 26, 2011
118 Pages
General catalog
101 Pages

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