MK22-B-4 Equivalent & Substitute Parts

Part Overview

The MK22-B-4 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 surface mount component operates within a 10–15 AT (Ampere-Turn) range and is rated for 1A switching current at 200V AC/DC with 20W power dissipation. The device is RoHS3 compliant and carries MSL 1 (unlimited moisture sensitivity level) classification.

Substitute parts become necessary when the primary part is unavailable, when packaging format requirements differ, or when application parameters permit operation at reduced electrical ratings. The MK15-B-2 represents a functionally compatible alternative within the Standex-Meder MK series reed switch portfolio.

Substiute Parts

MK22-B-4

Standex-Meder ElectronicsIn Stock: 649MK22-B-4 Datasheet

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MK15-B-2

Standex-Meder ElectronicsIn Stock: 1871MK15-B-2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MK22-B-4 is determined by the following critical parameters:

Circuit Configuration: Both the main part and substitute must maintain SPST-NO topology to preserve switching logic and control function.

Operate Range: The 10–15 AT specification defines the magnetic activation threshold. Substitute parts must operate within this identical range to ensure reliable triggering in the target application.

Mounting Type & Termination: Surface mount configuration with gull wing termination must be preserved for PCB assembly compatibility.

Operating Temperature Range: The −40°C to 130°C envelope must be maintained to ensure operation across the specified thermal environment.

Compliance & Certifications: RoHS3 compliance and MSL 1 classification must be retained for regulatory and manufacturing process compatibility.

Electrical Ratings (Reduced Tolerance): Substitute parts may operate at reduced current, voltage, or power ratings provided the application does not exceed these lower limits. The MK15-B-2 operates at 500mA switching current and 180V switching voltage, representing a downrated alternative suitable only for applications within these electrical constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (MK22-B-4): Use the MK22-B-4 when the application requires the full electrical specification: 1A switching current, 200V switching voltage, and 20W power dissipation. This part is actively manufactured and maintains full RoHS3 and MSL 1 compliance.

Substitute Selection (MK15-B-2): The MK15-B-2 is a valid substitute only when all of the following conditions are met:

1. The application switching current does not exceed 500mA (AC/DC)
2. The application switching voltage does not exceed 180V (AC/DC)
3. The application power dissipation does not exceed 10W
4. The application carry current does not exceed 1A (AC/DC)
5. Packaging format flexibility exists (Cut Tape or Digi-Reel® is acceptable)

Both parts share identical circuit configuration (SPST-NO), operate range (10–15 AT), mounting type (surface mount), termination style (gull wing), operating temperature range (−40°C to 130°C), and compliance certifications (RoHS3, MSL 1). The MK15-B-2 exhibits faster release time (0.05 ms versus 0.1 ms), which may be advantageous in applications requiring rapid deactivation.

Packaging Consideration: The MK22-B-4 is supplied in Tape & Reel (TR) format, while the MK15-B-2 is available in Cut Tape (CT) and Digi-Reel® formats. Selection between these packaging options depends on assembly line equipment and volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the MK15-B-2 directly replace the MK22-B-4 in any application?

A: No. The MK15-B-2 is a downrated substitute suitable only for applications where switching current remains at or below 500mA, switching voltage remains at or below 180V, and power dissipation remains at or below 10W. Applications requiring the full 1A/200V/20W specification of the MK22-B-4 cannot use the MK15-B-2.

Q: What is the significance of the identical 10–15 AT operate range?

A: The operate range defines the magnetic field strength (in Ampere-Turns) required to activate the reed switch. Both parts activate within this identical range, ensuring that the same magnetic stimulus will trigger both devices. This is a critical parameter for substitution compatibility.

Q: Why does the MK15-B-2 have a faster release time?

A: The MK15-B-2 release time is 0.05 ms compared to the MK22-B-4 release time of 0.1 ms. This difference is inherent to the device design and may reflect different reed contact materials or spring characteristics. In applications where rapid deactivation is beneficial, the MK15-B-2 may offer performance advantages.

Q: Are there differences in physical dimensions between these parts?

A: Yes. The MK22-B-4 body measures 0.457" L × 0.116" W × 0.091" H (11.60mm × 2.95mm × 2.30mm) with 0.094" height above board. The MK15-B-2 body measures 0.630" L × 0.098" W × 0.098" H (16.00mm × 2.50mm × 2.50mm) with 0.102" height above board. PCB layout and clearance requirements must accommodate these dimensional differences.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the MK22-B-4 and MK15-B-2 are RoHS3 compliant, carry MSL 1 (unlimited) moisture sensitivity level classification, and are REACH unaffected. Both are actively manufactured products. Compliance certifications are identical.

Q: What packaging formats are available for each part?

A: The MK22-B-4 is supplied in Tape & Reel (TR) format. The MK15-B-2 is available in Cut Tape (CT) and Digi-Reel® formats. Packaging selection depends on assembly equipment compatibility and volume requirements.

Q: Can the MK15-B-2 be used in a high-current application that requires 1A switching?

A: No. The MK15-B-2 is rated for 500mA switching current maximum. Using it in a 1A application would exceed its electrical rating and compromise reliability and safety.