DH4C-B1AA Equivalent & Substitute Parts

Part Overview

The DH4C-B1AA is a snap-action SPDT switch manufactured by ZF Electronics, designed for chassis mount applications with solder lug termination. This component operates at 30V DC with a 50mA current rating and features a round pin plunger actuator. The product is classified as obsolete, making identification of compatible substitute parts essential for ongoing maintenance, repair, and design continuity in legacy systems.

Substiute Parts

DH4C-B1AA

ZF ElectronicsIn Stock: 635DH4C-B1AA Datasheet

Current PartRFQ

DH2CB1AA

ZF ElectronicsIn Stock: 1431DH2CB1AA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DH4C-B1AA is determined by the following critical parameters that must remain constant or compatible:

• Circuit configuration (SPDT maintained)
• Actuator type (Round pin plunger maintained)
• Mounting type (Chassis mount maintained)
• Termination style (Solder lug maintained)
• Voltage rating (30V DC maintained)
• Operating temperature range (-25°C to 70°C maintained)
• Switch function (On-Momentary maintained)

The DH2CB1AA qualifies as a direct substitute based on these core parameters. While the current rating increases from 50mA to 500mA, this represents an upward compatibility margin that does not compromise circuit functionality. The substitute maintains identical mechanical and electrical interface characteristics, ensuring drop-in compatibility in the original application context.

Parameter Comparison

Engineering Selection Recommendations

The DH2CB1AA serves as the direct substitute for the DH4C-B1AA. Both components maintain ROHS3 compliance and MSL Level 1 classification, ensuring regulatory and environmental compatibility. The substitute part carries higher current capacity (500mA versus 50mA), which provides operational margin without introducing incompatibility. Both parts are classified as obsolete, reflecting their legacy status within the DH series product line.

Selection of the DH2CB1AA is appropriate for applications where the original DH4C-B1AA is no longer available. The mechanical interface, electrical characteristics, and environmental operating range remain functionally equivalent, supporting direct replacement in existing designs and assemblies.

Frequently Asked Questions (FAQ)

Q: Can the DH2CB1AA replace the DH4C-B1AA in all applications?

A: Yes. The DH2CB1AA maintains identical circuit configuration (SPDT), actuator type (round pin plunger), mounting method (chassis mount), and termination style (solder lug). The increased current rating of 500mA accommodates applications originally designed for 50mA operation.

Q: What is the significance of the current rating difference?

A: The DH2CB1AA is rated for 500mA DC, compared to the DH4C-B1AA at 50mA DC. This represents an upward compatibility margin. Applications drawing 50mA or less operate safely within the substitute part's specifications.

Q: Are there packaging differences between these parts?

A: The DH4C-B1AA is specified with packaging designation "-" (not detailed), while the DH2CB1AA is supplied in bulk packaging. Both maintain identical physical form factor and solder lug termination for chassis mount installation.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the DH4C-B1AA and DH2CB1AA are ROHS3 compliant, REACH unaffected, and classified as MSL Level 1 (unlimited moisture sensitivity). Both carry ECCN EAR99 and HTSUS 8536.50.7000 classifications.

Q: What is the operational difference in pretravel specifications?

A: The DH4C-B1AA specifies 0.008" (0.2mm) pretravel, while the DH2CB1AA specifies 0.014" (0.35mm) pretravel. Both values fall within acceptable snap-action switch operating parameters and do not affect functional compatibility in standard applications.

Q: Are both parts suitable for the same temperature range?

A: Yes. Both components operate across the identical temperature range of -25°C to 70°C, ensuring thermal compatibility in legacy and replacement scenarios.