45F820 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F820 is a 820 Ohms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 776 pieces in stock. The part is RoHS non-compliant in its standard form. Equivalent and substitute parts are identified to provide procurement flexibility, support supply chain continuity, and offer alternative compliance options where applicable.

Substiute Parts

45F820

OhmiteIn Stock: 88645F820 Datasheet

Current PartRFQ

45F820E

OhmiteIn Stock: 89945F820E Datasheet

DirectRFQ

ALSR05820R0FE12

Vishay DaleIn Stock: 1234ALSR05820R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F820 is determined by matching the following critical parameters: resistance value (820 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), and package type (axial). All identified substitutes meet these core electrical and mechanical requirements. Secondary parameters including temperature coefficient, operating temperature range, and RoHS compliance status are provided to support engineering selection but do not disqualify substitution based on functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

All three parts are active products with current manufacturing status. The 45F820E is an Ohmite variant offering ROHS3 compliance with identical electrical specifications and physical dimensions to the 45F820, making it a direct replacement for applications requiring RoHS compliance. The ALSR05820R0FE12 from Vishay Dale is functionally equivalent with ROHS3 compliance and moisture-resistant construction. Its slightly smaller physical dimensions (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L) and extended operating temperature range (-65°C ~ 250°C) may provide advantages in space-constrained or temperature-extreme applications. Selection should be based on compliance requirements, available board space, and operating environment specifications.

Frequently Asked Questions (FAQ)

Q: Can the 45F820E be used as a direct replacement for the 45F820? A: Yes. The 45F820E is electrically and mechanically identical to the 45F820, with identical resistance, tolerance, power rating, composition, package type, and physical dimensions. The primary difference is RoHS compliance status.

Q: What are the physical dimension differences between substitutes? A: The 45F820 and 45F820E share identical dimensions of 0.343" Dia x 0.937" L (8.70mm x 23.80mm). The ALSR05820R0FE12 is slightly smaller at 0.312" Dia x 0.875" L (7.92mm x 22.23mm), which may affect board layout compatibility.

Q: Does the temperature coefficient difference affect substitution? A: The 45F820 and 45F820E both specify ±20ppm/°C, while the ALSR05820R0FE12 specifies ±30ppm/°C. This difference is within typical wirewound resistor tolerances and does not disqualify substitution for standard applications. Applications requiring tighter temperature stability should verify specifications against circuit requirements.

Q: Which substitute offers the widest operating temperature range? A: The ALSR05820R0FE12 specifies an operating temperature range of -65°C ~ 250°C. Operating temperature ranges are not specified for the 45F820 or 45F820E.

Q: Are all substitutes RoHS compliant? A: The 45F820E and ALSR05820R0FE12 are both ROHS3 compliant. The original 45F820 is RoHS non-compliant.

Q: What is the moisture resistance difference? A: The ALSR05820R0FE12 features moisture-resistant construction with MSL rating of 1 (Unlimited). The 45F820 and 45F820E list moisture sensitivity as Not Applicable.