Switchcraft H203 Equivalent & Substitute Parts

Part Overview

The Switchcraft H203 is a pushbutton switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 250mA DC at 28V. This component features a round black button actuator with solder lug termination and is designed for panel mount, rear installation. The H203 is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and redesign applications where continued sourcing is required.

Substiute Parts

H203

Switchcraft Inc.In Stock: 723H203 Datasheet

Current PartRFQ

40-3657-00

Judco Manufacturing Inc.In Stock: 127840-3657-00 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Switchcraft H203 is determined by the following critical parameters:

• Circuit Configuration: Must be SPDT to maintain switching logic compatibility
• Mounting Type: Panel Mount, Rear installation required for mechanical fit
• Termination Style: Solder Lug connection for PCB integration
• Current Rating: Must equal or exceed 250mA DC
• Voltage Rating: Must equal or exceed 28V DC
• Actuator Type: Round button configuration for user interface consistency
• Panel Cutout Dimensions: Circular 15.87mm diameter for mechanical compatibility

The substitute part Judco Manufacturing 40-3657-00 shares the SPDT circuit, panel mount rear configuration, round button actuator, and black color. However, this part exhibits differences in current rating (2A vs. 250mA), voltage rating (14V vs. 28V), termination style (Wire Leads vs. Solder Lug), and product status (Active vs. Obsolete). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The Judco 40-3657-00 is an active product with RoHS3 compliance, offering advantages for new designs and systems requiring modern component standards. However, direct substitution requires careful evaluation:

Voltage Consideration: The H203 operates at 28V DC while the 40-3657-00 is rated for 14V DC. The substitute part cannot be used in circuits designed for 28V operation without circuit redesign.

Current Capacity: The 40-3657-00 provides 2A DC capacity, exceeding the H203's 250mA rating. This higher capacity is compatible with applications requiring 250mA or less.

Termination Compatibility: The H203 uses solder lug termination while the 40-3657-00 uses wire leads. PCB integration requires different connection methods and may necessitate adapter solutions or circuit board redesign.

Actuator Geometry: The H203 features a button actuator while the 40-3657-00 uses a plunger actuator. Panel cutout dimensions differ, requiring mechanical panel modifications.

For applications operating at 28V DC with solder lug termination requirements, alternative sources or custom solutions may be necessary. For applications operating at 14V DC or lower with wire lead compatibility, the 40-3657-00 provides an active, compliant alternative.

Frequently Asked Questions (FAQ)

Q: Can the Judco 40-3657-00 directly replace the Switchcraft H203 in existing assemblies?

A: Direct replacement is not possible without modifications. The voltage rating difference (14V vs. 28V), termination style difference (Wire Leads vs. Solder Lug), and actuator geometry difference (Plunger vs. Button) require circuit redesign, PCB modification, or panel rework.

Q: What is the primary reason the H203 is obsolete?

A: The H203 is classified as obsolete by Switchcraft Inc., indicating discontinued manufacturing. Equivalent alternatives must be sourced for new production or system redesign.

Q: Are there compliance differences between these parts?

A: Yes. The H203 is RoHS non-compliant, while the Judco 40-3657-00 is RoHS3 compliant. For applications requiring modern environmental compliance standards, the 40-3657-00 is preferable.

Q: What does SPDT circuit configuration mean for substitution?

A: SPDT (Single Pole Double Throw) means the switch has one input contact and two output positions. Both the H203 and 40-3657-00 maintain this configuration, ensuring switching logic compatibility when voltage and termination requirements are met.

Q: Can the higher current rating of the 40-3657-00 cause problems in a 250mA application?

A: No. A component rated for 2A can safely operate in a 250mA circuit. Higher current ratings indicate greater capacity and do not create compatibility issues for lower-current applications.

Q: What is the significance of panel cutout dimensions?

A: Panel cutout dimensions determine mechanical fit. The H203 requires a 15.87mm circular cutout. The 40-3657-00 specifications do not include panel cutout dimensions, requiring verification before mechanical installation.