MK15-B-1 Reed Switch Equivalent & Substitute Parts

Part Overview

The MK15-B-1 is an active molded body reed switch manufactured by Standex-Meder Electronics, configured as a single-pole single-throw normally open (SPST-NO) device. This component operates within a 10 to 15 ampere-turn (AT) magnetic field range and is rated for 500mA switching current at 180V across both AC and DC applications, with a maximum power dissipation of 10W. The device is packaged in tape and reel format for surface mount assembly.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified operating parameters. Alternative sources may be required due to inventory availability, supply chain considerations, or specific packaging requirements.

Substiute Parts

MK15-B-1

Standex-Meder ElectronicsIn Stock: 1129MK15-B-1 Datasheet

Current PartRFQ

59165-1-S-00-D

Littelfuse Inc.In Stock: 347059165-1-S-00-D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MK15-B-1 is determined by the following critical parameters:

Circuit Configuration: The substitute must maintain SPST-NO topology to preserve switching behavior in the application.

Operate Range: The magnetic field sensitivity must remain within the 10 ~ 15AT specification to ensure activation under identical magnetic conditions.

Current - Switching: The substitute must support at least 500mA switching current in both AC and DC modes to handle the rated load.

Voltage - Switching: Both AC and DC switching voltages must meet or exceed 180V to maintain electrical safety margins.

Power - Rated: The substitute must support the 10W power dissipation specification.

Mounting Type: Surface mount configuration is required for PCB assembly compatibility.

Operating Temperature Range: The substitute must function across the -40°C to 130°C operating window.

Compliance: RoHS3 compliance and REACH unaffected status are mandatory for regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

Primary Application Suitability: The MK15-B-1 is the specified component and maintains full performance across all rated parameters. Selection of this part is appropriate when the complete electrical and thermal envelope is required.

Substitute Consideration - 59165-1-S-00-D: The Littelfuse 59165-1-S-00-D presents the following constraints relative to the MK15-B-1:

• AC switching current is limited to 350mA versus the required 500mA, creating a 30% reduction in AC current capacity
• AC switching voltage is limited to 140V versus the required 180V, creating a 22% reduction in AC voltage margin
• Maximum operating temperature is limited to 105°C versus 130°C, reducing the thermal operating window by 25°C
• Operate and release times are doubled (1ms versus 0.5ms and 0.05ms respectively), affecting switching speed performance
• Termination style differs (Gull Wing versus Axial Flat), requiring PCB footprint redesign
• DC switching voltage is rated at 200V, exceeding the 180V requirement

Compliance Status: Both components maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, satisfying regulatory requirements.

Recommendation: The 59165-1-S-00-D is suitable only for DC-dominant applications where AC current does not exceed 350mA and AC voltage does not exceed 140V, with operating temperatures not exceeding 105°C. For applications requiring the full 500mA AC/DC rating at 180V across the -40°C to 130°C temperature range, the MK15-B-1 remains the appropriate selection. PCB redesign is necessary if substitution is pursued due to termination style differences.

Frequently Asked Questions (FAQ)

Q: Can the 59165-1-S-00-D replace the MK15-B-1 in all applications?

A: No. The 59165-1-S-00-D has reduced AC current (350mA vs. 500mA) and AC voltage (140V vs. 180V) ratings. Substitution is valid only for applications where AC current remains below 350mA and AC voltage remains below 140V.

Q: What is the impact of different termination styles?

A: The MK15-B-1 uses Axial Flat termination while the 59165-1-S-00-D uses Gull Wing termination. These require different PCB footprints and cannot be used interchangeably without circuit board redesign.

Q: Are the switching speed differences significant?

A: Yes. The MK15-B-1 operates in 0.5ms and releases in 0.05ms, while the 59165-1-S-00-D operates in 1ms and releases in 1ms. Applications requiring fast switching response should use the MK15-B-1.

Q: What is the temperature limitation of the 59165-1-S-00-D?

A: The 59165-1-S-00-D is rated to 105°C maximum, compared to 130°C for the MK15-B-1. Applications operating above 105°C require the MK15-B-1.

Q: Are both parts RoHS compliant?

A: Yes. Both the MK15-B-1 and 59165-1-S-00-D are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What packaging formats are available?

A: The MK15-B-1 is supplied in Tape & Reel (TR) format. The 59165-1-S-00-D is supplied in Cut Tape (CT) and Digi-Reel® format. Packaging selection depends on assembly line requirements.

Q: Can the 59165-1-S-00-D handle the full 10W power rating?

A: Yes. Both components are rated for 10W power dissipation. However, the reduced current and voltage ratings of the 59165-1-S-00-D limit the actual power that can be safely switched in most applications.