Ohmite 45F1K0E Equivalent & Substitute Parts

Part Overview

The Ohmite 45F1K0E is a 1 kOhms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and available in bulk packaging with 1153 pieces in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, different packaging formats, extended operating temperature ranges, or enhanced feature sets while maintaining core electrical specifications.

Substiute Parts

45F1K0E

OhmiteIn Stock: 125445F1K0E Datasheet

Current PartRFQ

WHE1K0FET

OhmiteIn Stock: 1652WHE1K0FET Datasheet

MFR RecommendedRFQ

UB5C-1KF1

RiedonIn Stock: 2544UB5C-1KF1 Datasheet

MFR RecommendedRFQ

85F1K0

OhmiteIn Stock: 81285F1K0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F1K0E are classified based on electrical parameter equivalence and mechanical compatibility. All identified substitutes maintain the core specifications: 1 kOhms resistance, ±1% tolerance, 5W power rating, wirewound composition, and axial package configuration. Substitution eligibility is determined by matching these parameters across all candidates.

The grouping includes:

• MFR Recommended substitutes: Parts meeting all electrical parameters with active product status and ROHS3 compliance
• Parametric equivalents: Parts matching electrical specifications but with different compliance or series designation

Key parameters governing substitution: Resistance value, tolerance, power rating, composition type, package style, and temperature coefficient.

Parameter Comparison

Engineering Selection Recommendations

WHE1K0FET (Ohmite WH Series): This MFR recommended substitute maintains identical electrical specifications and ROHS3 compliance. Physical dimensions are reduced (7.50mm x 20.00mm versus 8.70mm x 23.80mm), making it suitable for space-constrained applications. Operating temperature range is specified at -55°C ~ 150°C. Available in cut tape packaging with 1565 pieces in stock.

UB5C-1KF1 (Riedon UB Series): This MFR recommended substitute provides the widest operating temperature range (-55°C ~ 250°C) and includes additional features: current sense capability, flame proof construction, moisture resistance, pulse withstanding, and safety certification. Physical dimensions are the smallest (6.40mm x 12.70mm). MSL rating is 1 (Unlimited). Available in bulk packaging with 2491 pieces in stock. Select this part when extended temperature performance or enhanced safety features are required.

85F1K0 (Ohmite Acrasil® 80): This parametric equivalent matches all electrical specifications and physical dimensions to the 45F1K0E but carries RoHS non-compliant status. Select only when RoHS compliance is not a design requirement and legacy component sourcing is necessary.

Frequently Asked Questions (FAQ)

Q: Can WHE1K0FET replace 45F1K0E in all applications? A: WHE1K0FET is electrically equivalent with identical resistance, tolerance, power rating, and temperature coefficient. Physical dimensions are smaller. Compatibility depends on PCB layout constraints and operating temperature requirements (-55°C ~ 150°C).

Q: What are the advantages of UB5C-1KF1 over the original part? A: UB5C-1KF1 provides extended operating temperature range (-55°C ~ 250°C versus unspecified), integrated current sense functionality, flame proof and moisture resistant construction, pulse withstanding capability, and safety certification. Physical size is also reduced.

Q: Is 85F1K0 suitable for new designs? A: 85F1K0 is not recommended for new designs due to RoHS non-compliant status. It is suitable only for legacy system maintenance or applications where RoHS compliance is not mandated.

Q: How do physical dimensions affect substitution? A: All substitute parts use axial package configuration. Smaller dimensions (WHE1K0FET and UB5C-1KF1) may require PCB layout verification to ensure clearance and mounting compatibility. Larger dimensions (85F1K0) match the original 45F1K0E footprint exactly.

Q: What packaging options are available? A: 45F1K0E is supplied in bulk packaging. WHE1K0FET is available in cut tape format. UB5C-1KF1 is supplied in bulk. Packaging selection depends on assembly process requirements and order quantity.

Q: Are all substitutes ROHS3 compliant? A: WHE1K0FET and UB5C-1KF1 are ROHS3 compliant. 85F1K0 is RoHS non-compliant. For applications requiring regulatory compliance, select WHE1K0FET or UB5C-1KF1.