WNB250FET Equivalent & Substitute Parts

Part Overview

The WNB250FET is a 250 Ohm, 1% tolerance, 1W through-hole axial wirewound resistor manufactured by Ohmite. This non-inductive resistor is designed for applications requiring precision resistance with low temperature coefficient performance across industrial temperature ranges. The part is currently in active production status with 939 units available in inventory. Substitute parts are identified when equivalent electrical and mechanical specifications are maintained across the same product category, enabling component interchangeability in circuit designs where the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

WNB250FET

OhmiteIn Stock: 1015WNB250FET Datasheet

Current PartRFQ

WHB250FET

OhmiteIn Stock: 1844WHB250FET Datasheet

Parametric EquivalentRFQ

WHB250FET

OhmiteIn Stock: 1844WHB250FET Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WNB250FET is determined by strict equivalence across the following critical parameters:

• Resistance value: 250 Ohms
• Tolerance: ±1%
• Power rating: 1W
• Composition: Wirewound
• Non-inductive feature requirement
• Temperature coefficient: ±20ppm/°C
• Operating temperature range: -55°C to 150°C
• Package configuration: Axial through-hole
• Physical dimensions: 0.130" Dia × 0.276" L
• Number of terminations: 2

The WHB250FET meets all specified electrical and mechanical parameters, qualifying it as a parametric equivalent substitute. Both parts are manufactured by Ohmite and maintain identical functional specifications within the allowed tolerance and performance envelope.

Parameter Comparison

Engineering Selection Recommendations

Both WNB250FET and WHB250FET are active production components from Ohmite with full RoHS compliance certifications. The WNB250FET carries ROHS3 Compliant status with REACH Unaffected designation. The WHB250FET carries RoHS Compliant status with Moisture Sensitivity Level 1 (Unlimited). Both parts are classified under ECCN EAR99 for export control purposes. Selection between these parts should be based on inventory availability and compliance documentation requirements specific to the application or regulatory jurisdiction. The WHB250FET currently maintains higher inventory levels at 1770 units compared to 939 units for the WNB250FET.

Frequently Asked Questions (FAQ)

Q: Can WHB250FET be used as a direct replacement for WNB250FET in existing circuit designs?

A: Yes. Both parts maintain identical electrical specifications (250 Ohms, ±1%, 1W, ±20ppm/°C) and physical dimensions (0.130" Dia × 0.276" L). The axial through-hole package configuration and termination count are identical, enabling direct substitution in PCB layouts without modification.

Q: What are the key differences between WNB250FET and WHB250FET?

A: The primary differences are the series designation (WN versus WH) and RoHS certification status. WNB250FET carries ROHS3 Compliant status, while WHB250FET carries standard RoHS Compliant status. Both parts meet the same electrical and mechanical performance requirements.

Q: Are there any packaging or handling differences between these parts?

A: Both parts are supplied in Tape & Reel (TR) format. WHB250FET specifies Moisture Sensitivity Level 1 (Unlimited), while WNB250FET lists MSL as Not Applicable. Both parts are suitable for standard component handling and storage procedures.

Q: What determines substitution eligibility for 250 Ohm 1W wirewound resistors?

A: Substitution requires matching all critical parameters: 250 Ohm resistance value, ±1% tolerance, 1W power rating, wirewound composition, non-inductive feature, ±20ppm/°C temperature coefficient, -55°C to 150°C operating range, axial package type, and 0.130" Dia × 0.276" L physical dimensions.

Q: Can parts with different tolerance or temperature coefficient values substitute for WNB250FET?

A: No. Tolerance and temperature coefficient are critical parameters that determine circuit performance. Only parts with ±1% tolerance and ±20ppm/°C temperature coefficient qualify as substitutes.