Equivalent & Substitute Parts for 1SM379-H2

Part Overview

The 1SM379-H2 is a snap-action switch manufactured by Honeywell Sensing and Productivity Solutions, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a current rating of 5A at 250V AC. This through-hole mounted switch features a round pin plunger actuator and is designed for off-momentary operation across an operating temperature range of -55°C to 125°C. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing applications and new designs requiring similar electrical and mechanical characteristics.

Substiute Parts

1SM379-H2

Honeywell Sensing and Productivity SolutionsIn Stock: 7421SM379-H2 Datasheet

Current PartRFQ

ABS1510403

Panasonic Electric WorksIn Stock: 1123ABS1510403 Datasheet

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ABS1510409

Panasonic Electric WorksIn Stock: 2184ABS1510409 Datasheet

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ABS1510503

Panasonic Electric WorksIn Stock: 898ABS1510503 Datasheet

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ABS1510509

Panasonic Electric WorksIn Stock: 762ABS1510509 Datasheet

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DB1C-C1AA

ZF ElectronicsIn Stock: 1074DB1C-C1AA Datasheet

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MBG5A

APEM Inc.In Stock: 942MBG5A Datasheet

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MBZ101A01C02X02

APEM Inc.In Stock: 707MBZ101A01C02X02 Datasheet

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MWZ101C01C01X02

APEM Inc.In Stock: 1059MWZ101C01C01X02 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SM379-H2 is determined by the following critical parameters:

Primary Electrical Criteria:

• Circuit configuration (SPST-NO vs. SPDT)
• Current rating (5A minimum for AC operation)
• Voltage rating (250V AC minimum)
• Switch function (Off-Mom operation)

Secondary Mechanical Criteria:

• Actuator type (Round pin plunger)
• Mounting type (Through hole)
• Termination style (PC pin)
• Operating force and release force ranges
• Operating position tolerance

Environmental & Compliance Criteria:

• Operating temperature range (-55°C to 125°C preferred)
• RoHS compliance status
• Mechanical life rating (80,000 cycles minimum)

The substitute parts listed below are grouped into two categories based on their compatibility with the 1SM379-H2 specifications:

Category A - Direct Functional Equivalents (SPST-NO, 5A, 250V AC):

• MBG5A (APEM Inc.) - Matches circuit, current, and voltage specifications

Category B - Partial Equivalents (SPDT Configuration, Reduced Current or Voltage):

• ABS1510403, ABS1510409, ABS1510503, ABS1510509 (Panasonic Electric Works) - SPDT configuration, 2A, 125V AC
• DB1C-C1AA (ZF Electronics) - SPDT configuration, 5A AC, 125V AC
• MBZ101A01C02X02 (APEM Inc.) - SPDT configuration, 10A, 250V AC
• MWZ101C01C01X02 (APEM Inc.) - SPDT configuration, 5A, 125V AC

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MBG5A (APEM Inc.)

The MBG5A provides the closest functional match to the 1SM379-H2. Both switches feature SPST-NO circuit configuration, 5A AC current rating, and 250V AC voltage rating. The MBG5A is currently in active production status with ROHS3 compliance certification. The operating force of 274gf is comparable to the original 255gf specification. The mechanical life rating of 10,000,000 cycles significantly exceeds the 80,000-cycle requirement of the 1SM379-H2. The primary limitation is the reduced operating temperature range (-40°C to 85°C versus -55°C to 125°C), which may be acceptable depending on application requirements.

Secondary Recommendation: MBZ101A01C02X02 (APEM Inc.)

The MBZ101A01C02X02 maintains the 250V AC voltage rating and exceeds the current requirement with 10A AC capability. This part features SPDT circuit configuration, which provides additional switching flexibility. Active production status and ROHS3 compliance are confirmed. The 10,000,000-cycle mechanical life rating substantially exceeds the original specification. Circuit configuration change from SPST-NO to SPDT requires design review to ensure compatibility with existing circuit topology.

Alternative for Reduced Voltage Applications: DB1C-C1AA (ZF Electronics)

The DB1C-C1AA is suitable for applications where 125V AC operation is acceptable. This part provides 5A AC current rating and SPDT circuit configuration with active production status and ROHS3 compliance. The 15,000,000-cycle mechanical life rating is superior. The 48V DC rating exceeds the original 30V specification. Operating temperature range extends to 120°C, approaching the original upper limit.

Panasonic ABS Series (ABS1510409, ABS1510509 Recommended)

The ABS1510409 and ABS1510509 are suitable only for applications requiring 2A AC at 125V or lower. Both parts are in active production with RoHS compliance. The ABS1510409 carries ROHS3 certification. These parts are not recommended as direct replacements for the 1SM379-H2 due to reduced current and voltage ratings, but may serve applications with lower electrical requirements.

Frequently Asked Questions (FAQ)

Q1: Can the ABS1510409 directly replace the 1SM379-H2?

No. The ABS1510409 is rated for 2A AC at 125V, while the 1SM379-H2 is rated for 5A AC at 250V. Direct substitution would result in insufficient current and voltage capacity. The ABS1510409 is suitable only for applications with lower electrical requirements.

Q2: What is the primary difference between SPST-NO and SPDT circuit configurations?

SPST-NO (Single Pole Single Throw - Normally Open) provides one contact that closes when actuated. SPDT (Single Pole Double Throw) provides two contacts: one that closes and one that opens when actuated. SPDT switches offer additional switching flexibility but require circuit design compatibility verification.

Q3: Why is the MBG5A recommended over the MBZ101A01C02X02?

The MBG5A maintains the SPST-NO circuit configuration of the original 1SM379-H2, requiring no circuit topology changes. The MBZ101A01C02X02 uses SPDT configuration, which necessitates design review and potential circuit modifications. Both parts meet the electrical requirements; selection depends on circuit compatibility needs.

Q4: Are all recommended substitutes RoHS compliant?

Yes. The MBG5A, MBZ101A01C02X02, and DB1C-C1AA all carry ROHS3 compliance certification. The MWZ101C01C01X02 also carries ROHS3 certification. RoHS compliance ensures compatibility with current environmental and regulatory requirements.

Q5: What is the impact of the reduced operating temperature range in the MBG5A?

The MBG5A operates from -40°C to 85°C, compared to the 1SM379-H2 range of -55°C to 125°C. Applications requiring operation below -40°C or above 85°C cannot use the MBG5A. Review application temperature requirements before selection.

Q6: Does the MWZ101C01C01X02 offer any advantages despite lower mechanical life?

The MWZ101C01C01X02 provides IP67 ingress protection (dust tight and waterproof), compared to no specified ingress protection on the 1SM379-H2. This enhanced protection is valuable for applications in harsh or wet environments. However, the 1,000,000-cycle mechanical life is lower than other alternatives, making it suitable for lower-cycle-count applications.

Q7: Can the DB1C-C1AA be used in 250V AC applications?

No. The DB1C-C1AA is rated for 125V AC maximum. Using this part in 250V AC circuits would exceed its voltage rating and create safety and reliability risks. Verify application voltage requirements before selection.

Q8: What packaging options are available for the recommended substitutes?

The MBG5A is supplied in Tray packaging. The MBZ101A01C02X02 is supplied in Tray packaging. The MWZ101C01C01X02 is supplied in Bulk packaging. Packaging selection may affect procurement, handling, and inventory management processes.

Q9: How do the operating force specifications compare across alternatives?

The 1SM379-H2 requires 255gf operating force. The MBG5A requires 274gf (slightly higher). The MBZ101A01C02X02 requires 285gf (higher). The MWZ101C01C01X02 requires 153gf (lower). The Panasonic ABS series requires 100-150gf (lower). Operating force affects actuator design and user interface feel; verify compatibility with mechanical design.

Q10: What is the significance of the "Active" product status designation?

Active status indicates the part is currently in production and available for procurement. Obsolete status (as with the 1SM379-H2) indicates the part is no longer manufactured and existing inventory is limited. Selection of active-status parts ensures long-term availability and supply chain reliability.