RER55F7R50MCSL Equivalent & Substitute Parts

Part Overview

The RER55F7R50MCSL is a 7.5 Ohms ±1% 30W wirewound chassis mount resistor manufactured by Vishay Dale, qualified to military standard MIL-PRF-39009. This component is designed for high-power applications requiring precision resistance values with stable performance across extended temperature ranges. The part maintains active product status with 1102 units currently in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the specified parameter envelope.

Substiute Parts

RER55F7R50MCSL

Vishay DaleIn Stock: 1136RER55F7R50MCSL Datasheet

Current PartRFQ

RER75F7R50RC02

Vishay DaleIn Stock: 1109RER75F7R50RC02 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RER55F7R50MCSL is determined by strict equivalence across the following critical parameters:

• Resistance value: 7.5 Ohms
• Tolerance: ±1%
• Power rating: 30W
• Composition: Wirewound
• Temperature coefficient: ±50ppm/°C
• Operating temperature range: -55°C to 250°C
• Mounting feature: Flanges
• Lead style: Solder Lugs
• Housing type: Aluminum
• Physical dimensions: 1.968" L × 1.140" W
• Height - Seated (Max): 0.625"
• Military qualification: MIL-PRF-39009

The RER75F7R50RC02 meets all specified electrical and mechanical parameters, qualifying it as a parametric equivalent within the RER series of military-grade wirewound resistors.

Parameter Comparison

Engineering Selection Recommendations

Both the RER55F7R50MCSL and RER75F7R50RC02 are active, military-qualified components manufactured by Vishay Dale under MIL-PRF-39009 specification. Selection between these parts should be based on the following factors:

The RER75F7R50RC02 demonstrates a superior failure rate specification of R (0.01%) compared to the RER55F7R50MCSL at M (1%), making it suitable for applications where enhanced reliability is required. Both parts share identical electrical characteristics, mechanical dimensions, and environmental ratings. Neither part is RoHS compliant, which must be considered for applications subject to RoHS requirements. Both maintain unlimited moisture sensitivity level (MSL 1) and are available in current inventory quantities exceeding 1000 units.

Frequently Asked Questions (FAQ)

Q: Can the RER75F7R50RC02 be used as a direct replacement for the RER55F7R50MCSL?

A: Yes. Both parts are parametrically equivalent across all critical electrical and mechanical specifications, including resistance value, tolerance, power rating, temperature coefficient, operating temperature range, physical dimensions, and mounting configuration. Both are qualified to MIL-PRF-39009.

Q: What is the difference between the RER55 and RER75 series designations?

A: The RER55 and RER75 represent different product lines within the Vishay Dale military wirewound resistor family. The primary distinction is the failure rate specification: RER55 at M (1%) versus RER75 at R (0.01%). Both series meet MIL-PRF-39009 qualification requirements.

Q: Are there any physical or dimensional differences between these parts?

A: No. Both parts share identical physical dimensions of 1.968" L × 1.140" W (49.99mm × 28.96mm) with a maximum seated height of 0.625" (15.87mm). They are mechanically interchangeable in terms of board layout and mounting requirements.

Q: Do these parts have different environmental or temperature ratings?

A: No. Both parts operate across the identical temperature range of -55°C to 250°C with matching temperature coefficient specifications of ±50ppm/°C.

Q: What is the significance of the failure rate difference?

A: The failure rate specification indicates the expected percentage of component failures over a defined operational period. The RER75F7R50RC02 at R (0.01%) represents a lower failure rate than the RER55F7R50MCSL at M (1%), indicating enhanced long-term reliability for the RER75 variant.

Q: Are both parts currently available?

A: Yes. The RER55F7R50MCSL has 1102 units in stock, and the RER75F7R50RC02 has 1078 units in stock.

Q: Do these parts meet RoHS requirements?

A: No. Both the RER55F7R50MCSL and RER75F7R50RC02 are RoHS non-compliant. Applications requiring RoHS compliance must identify alternative components.