Equivalent & Substitute Parts for 45F33R

Part Overview

The Ohmite 45F33R is a 33 Ohm, 1% tolerance, 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active and remains in production. Substitute parts are identified when original stock is unavailable, when specific compliance requirements must be met, or when packaging formats differ from application needs.

Substiute Parts

45F33R

OhmiteIn Stock: 103945F33R Datasheet

Current PartRFQ

45F33RE

OhmiteIn Stock: 185945F33RE Datasheet

DirectRFQ

ALSR0533R00FE12

Vishay DaleIn Stock: 1222ALSR0533R00FE12 Datasheet

DirectRFQ

RS00533R00FS73

Vishay DaleIn Stock: 2126RS00533R00FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F33R are qualified based on the following electrical and mechanical parameters:

• Resistance value: 33 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Number of terminations: 2 (exact match required)

Substitutes may vary in the following parameters within acceptable engineering limits:

• Temperature coefficient (±20ppm/°C to ±30ppm/°C)
• Operating temperature range
• Physical dimensions (within axial package constraints)
• RoHS compliance status
• Packaging format (Bulk, Cut Tape)
• Moisture resistance features

Parameter Comparison

Engineering Selection Recommendations

45F33RE (Ohmite): Direct manufacturer equivalent with identical electrical specifications and physical dimensions. RoHS Compliant status provides regulatory advantage over the main part. Recommended for applications requiring RoHS compliance or extended operating temperature range (-55°C to 275°C). Bulk packaging format suitable for production assembly.

ALSR0533R00FE12 (Vishay Dale): Cross-manufacturer substitute with slightly reduced temperature coefficient (±30ppm/°C versus ±20ppm/°C) and lower maximum operating temperature (250°C versus 275°C for 45F33RE). Moisture-resistant construction provides environmental protection. Smaller physical dimensions (0.312" Dia x 0.875" L) may require PCB layout verification. ROHS3 Compliant. Bulk packaging format.

RS00533R00FS73 (Vishay Dale): Cross-manufacturer substitute with matching temperature coefficient (±20ppm/°C) and moisture-resistant construction. Smaller physical dimensions require PCB layout verification. RoHS non-compliant status matches the main part. Cut Tape packaging format suitable for automated pick-and-place assembly. Manufacturer-recommended substitute.

Frequently Asked Questions (FAQ)

Q: Can 45F33RE be used as a direct replacement for 45F33R?

A: Yes. Both parts share identical electrical specifications (33 Ohms, ±1%, 5W, wirewound) and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS compliance status. 45F33RE is RoHS Compliant, while 45F33R is RoHS non-compliant.

Q: What are the physical dimension differences between Ohmite and Vishay Dale substitutes?

A: The Ohmite 45F33R and 45F33RE measure 0.343" Dia x 0.937" L (8.70mm x 23.80mm). The Vishay Dale parts (ALSR0533R00FE12 and RS00533R00FS73) measure 0.312" Dia x 0.875" L (7.92mm x 22.23mm). The Vishay parts are slightly smaller and may require PCB layout verification before substitution.

Q: How does temperature coefficient affect part selection?

A: The 45F33R, 45F33RE, and RS00533R00FS73 all specify ±20ppm/°C. The ALSR0533R00FE12 specifies ±30ppm/°C, indicating slightly greater resistance drift with temperature changes. For precision applications with tight tolerance requirements, the ±20ppm/°C parts are preferred.

Q: What is the difference between Bulk and Cut Tape packaging?

A: Bulk packaging (45F33RE, ALSR0533R00FE12) is suitable for manual assembly or low-volume production. Cut Tape packaging (RS00533R00FS73) is optimized for automated pick-and-place assembly equipment and high-volume manufacturing.

Q: Are the Vishay Dale parts moisture-resistant?

A: Yes. Both ALSR0533R00FE12 and RS00533R00FS73 feature moisture-resistant construction. The Ohmite parts (45F33R and 45F33RE) do not specify moisture resistance.

Q: Which substitute should be selected for RoHS-compliant applications?

A: For RoHS compliance, select either 45F33RE (Ohmite, RoHS Compliant) or ALSR0533R00FE12 (Vishay Dale, ROHS3 Compliant). The RS00533R00FS73 is RoHS non-compliant and unsuitable for RoHS-regulated applications.