MLRR-4-32-38 Equivalent & Substitute Parts

Part Overview

The MLRR-4-32-38 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This through-hole component is designed for applications requiring reliable switching at 700mA AC or 1A DC with a maximum switching voltage of 140V AC and 200V DC. The part is currently active in production with 722 units in stock. Alternative models may be required due to inventory constraints, specific lead time requirements, or application-specific dimensional or performance considerations.

Substiute Parts

MLRR-4-32-38

Littelfuse Inc.In Stock: 807MLRR-4-32-38 Datasheet

Current PartRFQ

MLRR-3-32-38

Littelfuse Inc.In Stock: 2501MLRR-3-32-38 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The MLRR-3-32-38 qualifies as a direct substitute for the MLRR-4-32-38 based on the following critical electrical and mechanical parameters:

Matching Parameters:

• Circuit configuration: SPST-NO
• Operate range: 32 ~ 38AT
• Current switching capacity: 700mA (AC), 1A (DC)
• Voltage switching limits: 140V AC, 200V DC
• Rated power: 20W
• Mounting type: Through Hole
• Termination style: Axial
• Operating temperature range: -40°C ~ 125°C
• Body dimensions: 0.105" Dia x 0.600" L (2.66mm x 15.24mm)
• Compliance: ROHS3 Compliant, REACH Unaffected

The MLRR-3-32-38 belongs to the same MLRR reed switch family and maintains electrical equivalence across all switching parameters. Both parts are manufactured by Littelfuse Inc. and share identical circuit functionality and environmental ratings.

Parameter Comparison

Engineering Selection Recommendations

Both the MLRR-4-32-38 and MLRR-3-32-38 are active products from Littelfuse Inc. with ROHS3 compliance and REACH unaffected status, making them suitable for regulated applications. The MLRR-3-32-38 provides equivalent electrical performance with identical switching parameters, operating temperature range, and compliance certifications.

The primary differences are dimensional and timing-related. The MLRR-3-32-38 has a longer overall length (2.230" versus 1.590") and a marginally slower operate time (0.7 ms versus 0.6 ms). The MLRR-3-32-38 also carries a higher DC current rating (1.2A versus 1A). Selection between these parts should be based on available board space, lead time requirements, and specific application timing constraints.

Frequently Asked Questions (FAQ)

Q: Can the MLRR-3-32-38 be used as a direct replacement for the MLRR-4-32-38?

A: Yes, the MLRR-3-32-38 is electrically equivalent for switching applications. Both parts share identical circuit configuration (SPST-NO), operate range (32 ~ 38AT), switching current (700mA AC, 1A DC), and voltage ratings (140V AC, 200V DC). The primary consideration is physical length: the MLRR-3-32-38 is 0.640" longer overall, which may affect board layout compatibility.

Q: What are the key differences between these two parts?

A: The MLRR-3-32-38 differs in three areas: overall length (2.230" versus 1.590"), operate time (0.7 ms versus 0.6 ms), and DC carry current rating (1.2A versus 1A). All other electrical and mechanical parameters are identical.

Q: Are both parts compliant with environmental regulations?

A: Yes. Both the MLRR-4-32-38 and MLRR-3-32-38 are ROHS3 compliant and REACH unaffected, meeting current environmental standards for electronic components.

Q: Does the difference in operate time affect circuit performance?

A: The operate time difference is 0.1 ms (MLRR-4 at 0.6 ms versus MLRR-3 at 0.7 ms). This difference is negligible for most applications but should be evaluated if the circuit requires precise switching timing in the sub-millisecond range.

Q: Which part should I select for new designs?

A: Selection depends on available inventory, lead time, and physical constraints. Both parts are active products. If board space is limited, the MLRR-4-32-38 is shorter. If faster switching response is required, the MLRR-4-32-38 operates 0.1 ms faster. For applications requiring higher DC carry current, the MLRR-3-32-38 is rated at 1.2A.