45F68R Equivalent & Substitute Parts

Part Overview

The Ohmite 45F68R is a 68 Ohm ±1% 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is actively produced and maintained in inventory with 984 pieces available. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or when design requirements permit alternative manufacturers meeting identical or compatible electrical and mechanical specifications.

Substiute Parts

45F68R

OhmiteIn Stock: 99945F68R Datasheet

Current PartRFQ

45F68RE

OhmiteIn Stock: 69745F68RE Datasheet

DirectRFQ

ALSR0568R00FE12

Vishay DaleIn Stock: 1063ALSR0568R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F68R are qualified based on the following critical parameters:

• Resistance value: 68 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)
• Temperature coefficient: ±20ppm/°C or tighter (±30ppm/°C acceptable within engineering margins)
• Physical dimensions: Compatible with 0.343" Dia x 0.937" L footprint or equivalent

The following parts meet these substitution criteria:

1. 45F68RE (Ohmite) – Direct manufacturer equivalent with identical electrical specifications and packaging
2. ALSR0568R00FE12 (Vishay Dale) – Cross-manufacturer substitute with compatible electrical and mechanical parameters

Parameter Comparison

Engineering Selection Recommendations

45F68RE (Ohmite) is the primary substitute for the 45F68R. Both parts are manufactured by Ohmite with identical electrical specifications, temperature coefficient, and physical dimensions. The 45F68RE offers improved RoHS compliance status and defined operating temperature range (-55°C ~ 275°C), making it suitable for applications requiring regulatory compliance.

ALSR0568R00FE12 (Vishay Dale) is a cross-manufacturer alternative meeting all core electrical requirements. This part features a slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and operates across a narrower temperature range (-65°C ~ 250°C). Physical dimensions are slightly smaller (0.312" Dia x 0.875" L), which may require PCB layout verification for footprint compatibility. The ALSR series includes moisture-resistant construction and ROHS3 compliance, providing additional environmental protection in applications requiring enhanced reliability.

Selection between these substitutes depends on compliance requirements, thermal operating conditions, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can 45F68RE be used as a direct replacement for 45F68R?

A: Yes. Both parts share identical resistance (68 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), and physical dimensions (0.343" Dia x 0.937" L). The 45F68RE is a direct equivalent with improved RoHS compliance.

Q: What is the difference between 45F68R and ALSR0568R00FE12?

A: Both parts meet the core electrical specifications (68 Ohms ±1% 5W wirewound axial). The ALSR0568R00FE12 has a slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and smaller physical dimensions (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). PCB layout verification is required before substitution.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The 45F68R is RoHS non-compliant. The 45F68RE is RoHS Compliant, and the ALSR0568R00FE12 is ROHS3 Compliant. Applications requiring regulatory compliance should use 45F68RE or ALSR0568R00FE12.

Q: What is the operating temperature range for each part?

A: The 45F68R does not specify an operating temperature range. The 45F68RE operates from -55°C to 275°C. The ALSR0568R00FE12 operates from -65°C to 250°C. Verify application thermal requirements before selection.

Q: Can ALSR0568R00FE12 be used in existing PCB layouts designed for 45F68R?

A: Physical dimensions differ slightly. The ALSR0568R00FE12 is 0.312" Dia x 0.875" L compared to 0.343" Dia x 0.937" L for the 45F68R. PCB layout and mechanical clearance verification is required before substitution.

Q: What does the moisture-resistant feature on ALSR0568R00FE12 provide?

A: The ALSR series includes moisture-resistant construction, offering enhanced environmental protection in humid or corrosive operating conditions. This feature is not specified for the 45F68R or 45F68RE.