NKK Switches A25HW Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The NKK Switches A25HW is a toggle switch with DPDT (Double Pole Double Throw) configuration rated for 0.4VA at 28V AC/DC. This through-hole mounted switch features a flatted actuator and wire wrap termination, designed for applications requiring momentary-on switching functionality. The A25HW is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

A25HW

NKK SwitchesIn Stock: 955A25HW Datasheet

Current PartRFQ

B25JW

NKK SwitchesIn Stock: 1059B25JW Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the A25HW is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: DPDT topology must be maintained
• Electrical Ratings: 0.4VA current capacity and 28V AC/DC voltage rating are non-negotiable
• Switch Function: On-Mom (momentary) operation required
• Mounting Interface: Through-hole mounting with wire wrap termination
• Actuator Length: 6.30mm dimension for mechanical fit
• Operating Temperature: -30°C to 85°C range compatibility
• Electrical Life: 50,000 cycle minimum endurance

The B25JW meets all substitution criteria while offering active product status and improved sealing characteristics.

Parameter Comparison

Engineering Selection Recommendations

The B25JW is a direct functional equivalent to the A25HW for applications requiring DPDT momentary switching at 28V with 0.4VA capacity. Both parts maintain identical electrical specifications, operating temperature range, and actuator length. The primary distinction is product status: the A25HW is obsolete while the B25JW is active, ensuring ongoing availability and supply chain continuity.

The B25JW incorporates epoxy sealed terminals compared to the A25HW's process sealing, providing enhanced environmental protection. Both parts carry identical REACH and ECCN classifications, confirming regulatory equivalence. The actuator geometry differs (flatted versus standard round), which may affect panel cutout compatibility and user interface feel but does not impact electrical function.

For new designs or system replacements, the B25JW is the appropriate selection. For legacy system maintenance where the flatted actuator profile is mechanically required, the A25HW remains functionally valid if inventory is available.

Frequently Asked Questions (FAQ)

Q: Can the B25JW replace the A25HW in existing applications?

A: Yes. Both parts are electrically and functionally equivalent across all critical parameters: DPDT configuration, 0.4VA/28V rating, momentary operation, through-hole mounting, wire wrap termination, and 50,000-cycle electrical life. The primary difference is actuator geometry (flatted versus round), which affects panel interface but not electrical performance.

Q: What is the significance of the product status difference?

A: The A25HW is classified as obsolete, indicating discontinued manufacturing and limited availability. The B25JW is active, ensuring reliable procurement and supply chain support for current and future applications.

Q: Are there compliance or regulatory differences between these parts?

A: No. Both parts share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS codes. Moisture sensitivity levels are equivalent at MSL 1 (Unlimited).

Q: Does the sealing difference affect substitution suitability?

A: The B25JW's epoxy sealed terminals provide enhanced environmental protection compared to the A25HW's process sealing. This represents an improvement in robustness and does not restrict substitution in any application where the A25HW was previously used.

Q: What mechanical consideration should be evaluated for substitution?

A: The actuator type differs: A25HW uses a flatted profile while B25JW uses a standard round profile, both at 6.30mm length. Panel cutout dimensions and actuator engagement mechanisms must be verified for mechanical compatibility in the specific application.