DSS41A24 Reed Relay SPST 500mA 24VDC Equivalent & Substitute Parts

Part Overview

The DSS41A24 is a reed relay manufactured by Coto Technology, classified as a Single-Pole Single-Throw (SPST-NO) switching device rated for 500mA at 24VDC coil voltage. This through-hole mounted component features non-latching operation with 2kΩ coil resistance and is RoHS compliant. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain circuit compatibility and supply chain continuity.

Substiute Parts

DSS41A24

Coto TechnologyIn Stock: 64702DSS41A24 Datasheet

Current PartRFQ

HE3621A2400

Littelfuse Inc.In Stock: 1651HE3621A2400 Datasheet

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JWS-117-5

TE Connectivity Potter & Brumfield RelaysIn Stock: 870JWS-117-5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DSS41A24 are selected based on electrical and mechanical compatibility within the following critical parameters:

Electrical Compatibility: Coil voltage (24VDC), contact form (SPST-NO), contact current rating (500mA), coil type (non-latching), and operating temperature range (-40°C minimum to 85°C maximum).

Mechanical Compatibility: Through-hole mounting with PC pin termination style.

Supply Status: Active product status ensures ongoing availability and manufacturing support.

All listed substitute parts meet these core requirements. Variations in secondary parameters such as coil resistance, operate/release times, and maximum switching voltage represent acceptable engineering tolerances within the SPST reed relay category while maintaining functional equivalence for the intended application.

Parameter Comparison

Engineering Selection Recommendations

HE3621A2400 (Littelfuse Inc.) is the primary substitute option. This part maintains full electrical and mechanical compatibility with the DSS41A24, including matching coil voltage (24VDC), contact form (SPST-NO), current rating (500mA), and operating temperature range (-40°C ~ 85°C). The HE3621A2400 is ROHS3 compliant with active product status, ensuring consistent supply and manufacturing support. Switching voltage capacity (200VDC) matches the original specification.

JWS-117-5 (TE Connectivity Potter & Brumfield Relays) serves as an alternative substitute. This part shares the critical electrical parameters including 24VDC coil voltage, SPST-NO contact form, and 500mA contact rating. However, the maximum switching voltage is rated at 100VDC compared to 200VDC for the original part, and the operating temperature minimum is -35°C rather than -40°C. These differences must be evaluated against specific application requirements. The part is ROHS3 compliant with active product status. Operating time is longer at 1.5ms versus 0.5ms for the original design.

Both substitute parts are manufactured by industry-standard suppliers with established quality and compliance certifications, supporting long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can HE3621A2400 directly replace DSS41A24 in existing PCB layouts? A: Yes. Both parts share identical through-hole mounting with PC pin termination, allowing direct PCB substitution without layout modifications.

Q: What is the key difference between the two substitute options? A: HE3621A2400 provides 200VDC maximum switching voltage, matching the original DSS41A24 specification. JWS-117-5 is rated for 100VDC maximum switching voltage, requiring application review if higher voltage switching is required.

Q: Are there temperature range limitations with these substitutes? A: HE3621A2400 maintains the original -40°C ~ 85°C operating range. JWS-117-5 operates from -35°C ~ 85°C, limiting operation to maximum -35°C rather than -40°C.

Q: Do these substitutes meet modern compliance standards? A: Yes. Both HE3621A2400 and JWS-117-5 are ROHS3 compliant with REACH unaffected or vendor undefined status, supporting current manufacturing and export requirements.

Q: What are the coil current differences? A: DSS41A24 draws 12mA at 24VDC, while both substitutes draw approximately 11.1-11.2mA. This lower current requirement in substitutes may provide marginal power consumption benefits, though both values fall within typical control circuit tolerances.

Q: How do switching times compare? A: DSS41A24 operates in 0.5ms and releases in 0.5ms. HE3621A2400 operates in 1ms and releases in 1ms. JWS-117-5 operates in 1.5ms and releases in 0.5ms. Applications requiring fast switching may require performance evaluation.