RLR05C3921FSM23 Equivalent & Substitute Parts

Part Overview

The RLR05C3921FSM23 is a 3.92 kOhms ±1% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration. Manufactured by Vishay Dale under the military-grade RLR05 series per MIL-PRF-39017/05 specification, this component is designed for applications requiring moisture resistance and weldability in military and aerospace environments. The part maintains active product status with 1022 units currently in stock. Substitute parts are identified to address inventory availability, lead time requirements, or procurement preferences while maintaining identical electrical and mechanical specifications.

Substiute Parts

RLR05C3921FSM23

Vishay DaleIn Stock: 1038RLR05C3921FSM23 Datasheet

Current PartRFQ

RLR05C3921FSB14

Vishay DaleIn Stock: 1394RLR05C3921FSB14 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RLR05C3921FSM23 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part RLR05C3921FSB14 qualifies as a direct parametric equivalent based on the following criteria:

• Identical resistance value: 3.92 kOhms
• Matching tolerance: ±1%
• Equivalent power rating: 0.125W (1/8W)
• Same composition: Metal Film
• Identical temperature coefficient: ±100ppm/°C
• Matching operating temperature range: -65°C to 150°C
• Same package configuration: Axial
• Identical physical dimensions: 0.066" Dia × 0.150" L (1.68mm × 3.81mm)
• Same series classification: Military, MIL-PRF-39017/05, RLR05
• Equivalent failure rate: S (0.001%)

Parameter Comparison

Engineering Selection Recommendations

Both RLR05C3921FSM23 and RLR05C3921FSB14 are active products manufactured by Vishay Dale and maintain identical compliance profiles. Both components are RoHS non-compliant, REACH affected, and classified under ECCN EAR99 with HTSUS code 8533.21.0090. Selection between these parts should be based on procurement availability and lead time requirements, as they are electrically and mechanically interchangeable. The RLR05C3921FSB14 currently maintains higher inventory levels (1292 units) compared to the RLR05C3921FSM23 (1022 units), which may influence sourcing decisions for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Are RLR05C3921FSM23 and RLR05C3921FSB14 electrically interchangeable?

A: Yes. Both parts share identical electrical specifications including resistance value (3.92 kOhms), tolerance (±1%), power rating (0.125W), temperature coefficient (±100ppm/°C), and operating temperature range (-65°C to 150°C).

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. Both components feature identical axial package configuration with matching physical dimensions (0.066" Dia × 0.150" L), identical termination count (2), and equivalent mechanical properties including moisture resistance and weldability.

Q: What is the difference between RLR05C3921FSM23 and RLR05C3921FSB14?

A: These parts are parametrically equivalent. The difference in part number suffix (FSM23 versus FSB14) reflects different manufacturing batches or procurement lots from Vishay Dale, but all specified electrical and mechanical parameters remain identical.

Q: Are both parts compliant with military specifications?

A: Both parts are manufactured to MIL-PRF-39017/05 specification and classified as military-grade components within the RLR05 series. Both maintain identical failure rate classification (S, 0.001%).

Q: What are the compliance considerations for these parts?

A: Both RLR05C3921FSM23 and RLR05C3921FSB14 are RoHS non-compliant and REACH affected. Both are classified under ECCN EAR99 and HTSUS code 8533.21.0090. Compliance requirements should be evaluated based on end-use application and regional regulations.