MLRR-4-27-33 Equivalent & Substitute Parts

Part Overview

The MLRR-4-27-33 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This component operates within a 27 ~ 33AT magnetic field range and is rated for 700mA AC / 1A DC switching at 140V AC and 200V DC. The device is designed for through-hole mounting with axial termination and is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

MLRR-4-27-33

Littelfuse Inc.In Stock: 2003MLRR-4-27-33 Datasheet

Current PartRFQ

MLRR-3-27-33

Littelfuse Inc.In Stock: 1721MLRR-3-27-33 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MLRR-4-27-33 is determined by strict equivalence across the following critical parameters:

• Circuit configuration (SPST-NO)
• Operate range (27 ~ 33AT magnetic field sensitivity)
• Current switching capacity (700mA AC / 1A DC minimum)
• Voltage switching ratings (140V AC / 200V DC minimum)
• Power rating (20W minimum)
• Mounting type (Through Hole)
• Termination style (Axial)
• Operating temperature range (-40°C ~ 125°C)
• Regulatory compliance (ROHS3, REACH Unaffected)

The MLRR-3-27-33 meets all substitution criteria. Both parts share identical circuit configuration, operate range, switching current and voltage specifications, power rating, mounting type, termination style, and temperature operating range. Both are ROHS3 compliant and REACH unaffected.

Parameter Comparison

Engineering Selection Recommendations

Both the MLRR-4-27-33 and MLRR-3-27-33 are active production components from Littelfuse Inc. with identical regulatory compliance status (ROHS3 Compliant, REACH Unaffected). Selection between these parts is based on application-specific requirements:

The MLRR-4-27-33 features a shorter overall length of 1.590" (40.39mm) with an operate time of 0.6 ms, suitable for space-constrained applications requiring faster response.

The MLRR-3-27-33 provides a longer overall length of 2.230" (56.64mm) with an operate time of 0.7 ms and increased DC carry current of 1.2A, offering enhanced current handling capacity for sustained load conditions.

Both parts maintain identical switching specifications, temperature operating range, and mechanical body dimensions, ensuring functional equivalence within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can MLRR-3-27-33 replace MLRR-4-27-33 in existing designs?

A: Yes. Both parts share identical circuit configuration (SPST-NO), operate range (27 ~ 33AT), switching current (700mA AC / 1A DC), switching voltage (140V AC / 200V DC), power rating (20W), mounting type (Through Hole), termination style (Axial), and operating temperature range (-40°C ~ 125°C). The primary difference is overall length: MLRR-3-27-33 is 2.230" versus MLRR-4-27-33 at 1.590". Verify PCB layout accommodates the longer dimension.

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

A: The MLRR-4-27-33 has a shorter overall length (1.590") and faster operate time (0.6 ms). The MLRR-3-27-33 has a longer overall length (2.230"), slightly slower operate time (0.7 ms), and higher DC carry current (1.2A versus 1A). All other electrical and mechanical parameters are equivalent.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both MLRR-4-27-33 and MLRR-3-27-33 are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component manufacturing and distribution.

Q: What determines substitution eligibility for this reed switch series?

A: Substitution is valid when parts maintain identical circuit configuration, operate range, switching current and voltage ratings, power rating, mounting type, termination style, and operating temperature range. Body dimensions and response time may vary within acceptable application parameters.