MRPR-3-32-43 Equivalent & Substitute Parts

Part Overview

The MRPR-3-32-43 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 32–43 AT (Ampere-Turn) range and is rated for 50W power dissipation with switching capabilities of 1.1A AC and 1.5A DC at 140V AC / 200V DC. The part features through-hole axial termination and operates across a temperature range of -40°C to 125°C.

The MRPR-3-32-43 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this legacy device is specified.

Substiute Parts

MRPR-3-32-43

Littelfuse Inc.In Stock: 795MRPR-3-32-43 Datasheet

Current PartRFQ

MRPR-20-32-43

Littelfuse Inc.In Stock: 1111MRPR-20-32-43 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MRPR-20-32-43 qualifies as a direct substitute for the MRPR-3-32-43 based on the following critical parameters:

Matching Parameters (Substitution Basis):

• Circuit configuration: SPST-NO
• Operate range: 32–43 AT
• Current switching capacity: 1.1A (AC), 1.5A (DC)
• Power rating: 50W
• Mounting type: Through hole
• Termination style: Axial
• Operating time: 0.75 ms
• Release time: 0.3 ms
• Capacitance: 0.2 pF
• Current carry capacity: 3A (DC)
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity level: 1 (Unlimited)

Distinguishing Characteristics: The MRPR-20-32-43 operates at higher voltage ratings (265V AC / 250V DC) compared to the MRPR-3-32-43 (140V AC / 200V DC), making it suitable for applications requiring elevated voltage switching. The MRPR-20-32-43 is classified as Active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

The MRPR-20-32-43 is the direct substitute for the obsolete MRPR-3-32-43. Both components maintain identical electrical switching characteristics, mechanical form factors, and compliance certifications (ROHS3 Compliant, MSL 1).

Selection of the MRPR-20-32-43 is supported by:

• Active product status ensuring long-term availability and supply chain continuity
• Identical circuit topology and switching performance parameters
• Higher voltage rating (265V AC / 250V DC) providing design margin for applications originally specified at 140V AC / 200V DC
• Equivalent thermal and environmental operating specifications
• Matching RoHS3 compliance and moisture sensitivity classification

The MRPR-20-32-43 is suitable for direct replacement in applications where the original MRPR-3-32-43 was specified, provided the circuit design accommodates the higher voltage rating.

Frequently Asked Questions (FAQ)

Q: Can the MRPR-20-32-43 directly replace the MRPR-3-32-43 in existing designs?

A: Yes. Both components share identical circuit configuration (SPST-NO), operate range (32–43 AT), switching current (1.1A AC / 1.5A DC), power rating (50W), mounting type (through hole), and termination style (axial). The MRPR-20-32-43 operates at higher voltage ratings, making it compatible with applications originally designed for the MRPR-3-32-43.

Q: What is the primary difference between these two parts?

A: The MRPR-20-32-43 is rated for 265V AC / 250V DC switching voltage, compared to the MRPR-3-32-43 at 140V AC / 200V DC. The MRPR-20-32-43 also features an active product status, ensuring ongoing manufacturer support and availability.

Q: Are there any physical dimension differences?

A: Overall length remains identical at 2.230" (56.64mm). The body diameter is the same at 0.112" (2.84mm). The body length differs slightly: MRPR-3-32-43 is 0.775" L (19.69mm), while MRPR-20-32-43 is 0.800" L (20.32mm). This minor difference does not affect through-hole PCB mounting compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MRPR-3-32-43 and MRPR-20-32-43 are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited). Both carry EAR99 ECCN classification and HTSUS code 8536.50.9065.

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

A: The MRPR-3-32-43 operates from -40°C to 125°C. The MRPR-20-32-43 operates from -20°C to 125°C. For applications requiring operation below -20°C, the MRPR-3-32-43 specification must be maintained.

Q: Are there packaging differences?

A: The MRPR-3-32-43 is available in standard packaging. The MRPR-20-32-43 is supplied in bulk packaging. Confirm packaging requirements with your procurement specification.