Ohmite 45F400 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F400 is a 400 Ohm ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 738 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit equivalent electrical and mechanical specifications.

Substiute Parts

45F400

OhmiteIn Stock: 77745F400 Datasheet

Current PartRFQ

ALSR05400R0FE12

Vishay DaleIn Stock: 1029ALSR05400R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 45F400 is determined by the following critical parameters:

• Resistance Value: 400 Ohms (exact match required)
• Tolerance: ±1% (equivalent or tighter tolerance acceptable)
• Power Rating: 5W (equal or greater acceptable)
• Composition: Wirewound (maintains electrical characteristics)
• Package Type: Axial (ensures mechanical and thermal compatibility)
• Termination Count: 2 (standard through-hole configuration)

The Vishay Dale ALSR05400R0FE12 meets all substitution criteria with identical electrical specifications and compatible physical dimensions within the axial package standard.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (Ohmite 45F400): Select when RoHS non-compliant components are acceptable for the application and when the specific thermal characteristics of ±20ppm/°C are required.

Substitute Part (Vishay Dale ALSR05400R0FE12): Select when ROHS3 compliance is required or when moisture-resistant construction is beneficial for the operating environment. The slightly larger temperature coefficient (±30ppm/°C) remains within acceptable tolerances for most general-purpose applications. Physical dimensions are slightly smaller, which may provide layout advantages in space-constrained designs.

Both parts are active products with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR05400R0FE12 directly replace the Ohmite 45F400 in existing designs?

A: Yes. Both components share identical resistance values, tolerance, power rating, and axial package configuration. The Vishay Dale part has slightly different physical dimensions (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L), which must be verified against PCB layout constraints. The temperature coefficient difference (±30ppm/°C versus ±20ppm/°C) is acceptable for general-purpose applications.

Q: What is the primary difference between these two parts?

A: The Vishay Dale ALSR05400R0FE12 is ROHS3 compliant with moisture-resistant construction, while the Ohmite 45F400 is RoHS non-compliant. Both deliver identical electrical performance at 400 Ohms ±1% 5W.

Q: Are there any mechanical compatibility concerns?

A: The Vishay Dale substitute is slightly smaller in both diameter and length. Verify that the reduced dimensions do not create clearance issues in your specific PCB layout or mechanical assembly.

Q: Which part should be selected for new designs?

A: Selection depends on regulatory and environmental requirements. For applications requiring RoHS compliance, select the Vishay Dale ALSR05400R0FE12. For applications without compliance requirements, either part is suitable based on availability and cost considerations.