45F270 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F270 is a 270 Ohm ±1% 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is currently active in production with 1136 units in stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design requirements necessitate alternative sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

45F270

OhmiteIn Stock: 118345F270 Datasheet

Current PartRFQ

45F270E

OhmiteIn Stock: 109045F270E Datasheet

DirectRFQ

ALSR05270R0FE12

Vishay DaleIn Stock: 1716ALSR05270R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F270 are qualified based on the following critical parameters:

• Resistance value: 270 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitutes meet all mandatory electrical and mechanical parameters. Variations in temperature coefficient, physical dimensions within tolerance, and compliance certifications are noted but do not disqualify substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

45F270E (Ohmite): Direct equivalent from the same manufacturer. Identical electrical specifications and physical dimensions. Offers ROHS3 compliance where the original 45F270 does not. Recommended for applications requiring RoHS compliance.

ALSR05270R0FE12 (Vishay Dale): Functionally equivalent with identical electrical parameters. Temperature coefficient specification is ±30ppm/°C compared to ±20ppm/°C for the primary part. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). Includes moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). ROHS3 compliant. Suitable for applications where compact form factor and enhanced environmental protection are beneficial.

Frequently Asked Questions (FAQ)

Q: Can 45F270E be used as a direct replacement for 45F270?

A: Yes. The 45F270E is electrically and mechanically identical to the 45F270, with the same resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The primary difference is RoHS3 compliance status.

Q: What are the dimensional differences between ALSR05270R0FE12 and 45F270?

A: The ALSR05270R0FE12 has a smaller diameter (0.312" versus 0.343") and shorter length (0.875" versus 0.937"). These dimensional variations may affect PCB layout and mechanical clearance in space-constrained applications.

Q: Does the temperature coefficient difference affect substitution suitability?

A: The ALSR05270R0FE12 has a ±30ppm/°C temperature coefficient compared to ±20ppm/°C for the 45F270. This difference is within acceptable ranges for most general-purpose applications but should be evaluated for precision circuits requiring tight temperature stability.

Q: Are all substitute parts RoHS compliant?

A: The 45F270E and ALSR05270R0FE12 are both ROHS3 compliant. The original 45F270 is RoHS non-compliant. Selection depends on regulatory and design requirements.

Q: Can ALSR05270R0FE12 be used in applications requiring the exact physical dimensions of 45F270?

A: No. The ALSR05270R0FE12 has different physical dimensions and may not fit in PCB layouts designed specifically for the 45F270 form factor. Verify mechanical clearance and PCB hole spacing before substitution.