MRPR-8-27-33 Equivalent & Substitute Parts

Part Overview

The MRPR-8-27-33 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This through-hole component is rated for 700mA AC / 1A DC switching at 265V AC and 250V DC, with a 50W power rating. The part operates within a 27–33AT magnetic field range with 0.75ms operate time and 0.3ms release time.

The MRPR-8-27-33 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.

Substiute Parts

MRPR-8-27-33

Littelfuse Inc.In Stock: 1023MRPR-8-27-33 Datasheet

Current PartRFQ

MRPR-20-27-33

Littelfuse Inc.In Stock: 10594MRPR-20-27-33 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MRPR-20-27-33 qualifies as a direct substitute for the MRPR-8-27-33 based on the following critical parameters:

Matching Parameters:

• Circuit configuration: SPST-NO
• Type: Glass body reed switch
• Operate range: 27–33AT (identical magnetic sensitivity)
• Voltage ratings: 265V AC / 250V DC (identical)
• Power rating: 50W (identical)
• Operate time: 0.75ms (identical)
• Release time: 0.3ms (identical)
• Mounting type: Through hole (identical)
• Termination style: Axial (identical)
• Physical dimensions: 2.230" overall length, 0.112" diameter body (identical)
• Operating temperature range: -20°C to 125°C (identical)
• Capacitance: 0.2pF (identical)

Distinguishing Parameter:

• Current - Switching: MRPR-20-27-33 rated for 1.1A (AC) / 1.5A (DC) versus MRPR-8-27-33 rated for 700mA (AC) / 1A (DC)
• Current - Carry: MRPR-20-27-33 rated for 3A (DC) versus MRPR-8-27-33 rated for 2.5A (DC)

The MRPR-20-27-33 provides higher current handling capability while maintaining all other electrical and mechanical specifications. This makes it suitable for applications requiring equal or lower current levels than its rating.

Parameter Comparison

Engineering Selection Recommendations

The MRPR-20-27-33 is the appropriate substitute for the obsolete MRPR-8-27-33. Selection is based on the following factors:

Product Status: The MRPR-8-27-33 is obsolete, while the MRPR-20-27-33 is active and maintains current manufacturing support from Littelfuse Inc.

Compliance & Certifications: Both parts maintain identical RoHS3 compliance, MSL rating of 1 (Unlimited), and EAR99 export classification. Both share the same HTSUS code (8536.50.9065), confirming equivalent tariff classification.

Electrical Compatibility: The MRPR-20-27-33 maintains all critical switching parameters: identical voltage ratings (265V AC / 250V DC), identical power rating (50W), identical operate and release times (0.75ms / 0.3ms), and identical magnetic sensitivity range (27–33AT). The increased current ratings (1.1A AC / 1.5A DC switching, 3A DC carry) provide margin for applications originally designed for the MRPR-8-27-33 (700mA AC / 1A DC switching, 2.5A DC carry).

Mechanical Compatibility: Identical through-hole mounting, axial termination, physical dimensions, and operating temperature range ensure direct PCB compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the MRPR-20-27-33 directly replace the MRPR-8-27-33 in existing designs?

A: Yes. The MRPR-20-27-33 maintains identical circuit configuration (SPST-NO), voltage ratings (265V AC / 250V DC), power rating (50W), magnetic sensitivity (27–33AT), timing characteristics (0.75ms operate / 0.3ms release), and physical form factor (through-hole, axial termination, 2.230" length). No PCB modifications are required.

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

A: The MRPR-20-27-33 has higher current-switching ratings (1.1A AC / 1.5A DC versus 700mA AC / 1A DC) and higher current-carry rating (3A DC versus 2.5A DC). All other electrical and mechanical parameters are identical.

Q: Is the higher current rating of the MRPR-20-27-33 a concern for applications designed for the MRPR-8-27-33?

A: No. Higher current ratings do not create compatibility issues. Applications originally designed for 700mA AC / 1A DC switching will operate within the MRPR-20-27-33 specification envelope. The substitute part provides additional margin without affecting circuit behavior.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, carry MSL rating 1 (Unlimited), share EAR99 export classification, and are assigned the same HTSUS code (8536.50.9065).

Q: What is the availability status of each part?

A: The MRPR-8-27-33 is obsolete. The MRPR-20-27-33 is active and maintains current manufacturing support from Littelfuse Inc., with 10,551 pieces in stock.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical overall length (2.230" / 56.64mm), body diameter (0.112" / 2.84mm), and body length (0.800" / 20.32mm). No mechanical interference or mounting issues will occur.

Q: Do both parts operate within the same temperature range?

A: Yes. Both parts are rated for -20°C to 125°C operating temperature range.