MHS123 Equivalent & Substitute Parts

Part Overview

The MHS123 is a slide switch with SPDT (Single Pole Double Throw) configuration manufactured by APEM Inc. It is rated for 300mA DC at 30V with through-hole mounting and PC pin termination. The switch features an On-Off-On function with a 4.50mm actuator and silver-plated brass contacts. The product is currently obsolete, making equivalent substitutes necessary for ongoing applications and new designs requiring similar electrical and mechanical characteristics.

Substiute Parts

MHS123

APEM Inc.In Stock: 1197MHS123 Datasheet

Current PartRFQ

1825255-5

TE Connectivity ALCOSWITCH SwitchesIn Stock: 37241825255-5 Datasheet

SimilarRFQ

AS1E-2M-10-Z

Nidec Components CorporationIn Stock: 1320AS1E-2M-10-Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MHS123 is determined by the following core parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPDT
• Switch function: On-Off-On
• Mounting type: Through Hole
• Termination style: PC Pin
• Operating temperature range: -20°C ~ 85°C minimum
• RoHS3 compliance

Secondary Compatibility Criteria:

• Current rating: Minimum 300mA capability
• Voltage rating: Minimum 30V DC capability
• Actuator length: 4.50mm ±0.20mm tolerance acceptable
• Switch travel: 2.00mm ±0.20mm tolerance acceptable

The substitute parts listed below meet the primary criteria. Voltage and current ratings may exceed the original specification, which is acceptable for direct substitution in applications designed for the MHS123.

Parameter Comparison

Engineering Selection Recommendations

1825255-5 (TE Connectivity ALCOSWITCH Switches)

This substitute provides the closest electrical and mechanical match to the MHS123. It maintains identical SPDT configuration, On-Off-On function, 4.50mm actuator length, and 2.00mm switch travel. The 300mA AC rating and 125V AC voltage rating exceed the original DC specifications. The part is active in production with ROHS3 compliance and extended electrical life (15,000 cycles). This substitute is suitable for direct replacement in applications where the original MHS123 was specified.

AS1E-2M-10-Z (Nidec Components Corporation)

This substitute meets the core SPDT and On-Off-On requirements with identical operating temperature range and ROHS3 compliance. However, the current rating (50mA AC/DC) is significantly lower than the MHS123 (300mA DC), and the actuator length (4.30mm) and switch travel (2.20mm) differ from the original. This substitute is suitable only for applications where current requirements do not exceed 50mA and where the mechanical dimension variations are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 1825255-5 directly replace the MHS123 in all applications?

A: The 1825255-5 meets all primary compatibility criteria and maintains identical mechanical dimensions and circuit configuration. It is suitable for direct replacement in applications designed for the MHS123. The higher voltage and current ratings do not prevent substitution.

Q: What is the key limitation of the AS1E-2M-10-Z as a substitute?

A: The AS1E-2M-10-Z has a maximum current rating of 50mA, which is significantly lower than the MHS123's 300mA rating. This substitute is only appropriate for low-current applications. Additionally, the actuator length and switch travel differ slightly from the original specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both substitute parts (1825255-5 and AS1E-2M-10-Z) are ROHS3 compliant, matching the compliance status of the original MHS123.

Q: What is the difference between the contact finishes?

A: The MHS123 and 1825255-5 use silver-plated contacts, while the AS1E-2M-10-Z uses gold-plated contacts. Gold plating provides enhanced corrosion resistance and is suitable for low-current applications. Silver plating is standard for higher-current switches.

Q: Can I use the AS1E-2M-10-Z in a 300mA application?

A: No. The AS1E-2M-10-Z is rated for a maximum of 50mA. Using it in a 300mA application will exceed its electrical rating and may cause contact degradation or failure.

Q: Are the mechanical dimensions of the substitutes compatible with the original PCB layout?

A: The 1825255-5 has identical actuator length (4.50mm) and switch travel (2.00mm) to the MHS123, ensuring mechanical compatibility. The AS1E-2M-10-Z has a 4.30mm actuator length and 2.20mm switch travel, which may require PCB layout verification before substitution.