MSS41A24 Equivalent & Substitute Parts

Part Overview

The MSS41A24 is a reed relay manufactured by Coto Technology, classified as a SPST-NO (Single Pole Single Throw, Normally Open) switching device rated for 2A at 24VDC coil voltage. This through-hole mounted relay is designed for applications requiring low-current switching with fast response times and operates across an extended temperature range of -40°C to 105°C.

The MSS41A24 is discontinued at DiGi Electronics, making identification of functionally equivalent alternatives necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain compatibility with the original electrical specifications, mechanical mounting requirements, and termination style to ensure direct replacement capability.

Substiute Parts

MSS41A24

Coto TechnologyIn Stock: 921MSS41A24 Datasheet

Current PartRFQ

CXE240D5

Sensata-CrydomIn Stock: 1748CXE240D5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MSS41A24 is based on functional equivalence within the following critical parameters:

Contact Configuration: The substitute must maintain SPST-NO (1 Form A) contact topology to ensure identical switching behavior in the application circuit.

Coil Voltage Compatibility: The substitute must operate within the MSS41A24 coil voltage specification of 24VDC. Input voltage ranges that encompass 24VDC operation satisfy this requirement.

Current Rating: The substitute contact rating must equal or exceed the 2A specification to handle the intended load without derating.

Switching Voltage Capability: The substitute must support switching voltages up to 500VAC and 500VDC to maintain compatibility with the original application envelope.

Mounting and Termination: Through-hole mounting with PC pin termination is required for direct mechanical and electrical replacement on existing printed circuit boards.

Environmental Compliance: Active product status and current manufacturing availability are preferred to ensure long-term supply chain reliability.

The CXE240D5 solid-state relay meets these substitution criteria with enhanced specifications in load current capacity and input voltage range flexibility.

Parameter Comparison

Engineering Selection Recommendations

CXE240D5 as Primary Substitute:

The CXE240D5 is classified as an active product with current manufacturing availability, providing supply chain continuity for applications previously served by the discontinued MSS41A24. Both devices maintain SPST-NO contact configuration and PC pin termination for direct circuit board compatibility.

The CXE240D5 input voltage range of 15 ~ 32VDC encompasses the MSS41A24 24VDC coil voltage specification, ensuring proper relay operation within the original design envelope. The substitute's 5A load current rating exceeds the MSS41A24 2A specification, providing additional capacity margin for the application.

The CXE240D5 achieves ROHS3 compliance, whereas the MSS41A24 is RoHS non-compliant. This distinction is significant for applications subject to regulatory requirements or procurement policies mandating RoHS-compliant components.

Both devices maintain MSL 1 (Unlimited) moisture sensitivity classification, indicating equivalent environmental robustness for storage and handling.

The CXE240D5 is a solid-state relay (SSR) technology, whereas the MSS41A24 is a reed relay. This technology difference introduces distinct operational characteristics: the SSR provides zero-cross switching for AC loads and eliminates mechanical contact wear, while the reed relay offers galvanic isolation and lower input current requirements. Application-specific requirements determine whether this technology transition is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the CXE240D5 directly replace the MSS41A24 on the existing printed circuit board?

A: The CXE240D5 maintains through-hole mounting and PC pin termination compatible with the MSS41A24 footprint. However, the 4-SIP package geometry differs from the original relay package. Physical board layout verification is required to confirm pin-to-pin compatibility and clearance around the substitute component.

Q: What is the primary functional difference between the MSS41A24 and CXE240D5?

A: The MSS41A24 is a reed relay with mechanical contacts, while the CXE240D5 is a solid-state relay (SSR) with semiconductor switching. Reed relays provide galvanic isolation and operate with lower input current (11.1 mA vs. typical SSR requirements). Solid-state relays offer faster switching, no contact bounce, and longer operational life without mechanical wear.

Q: Does the CXE240D5 input voltage range of 15 ~ 32VDC accommodate the MSS41A24 24VDC specification?

A: Yes. The CXE240D5 input voltage range encompasses 24VDC operation. The 15 ~ 32VDC specification provides tolerance for supply voltage variations while maintaining reliable relay activation.

Q: Are there compliance differences between these two parts?

A: The MSS41A24 is RoHS non-compliant, while the CXE240D5 is ROHS3 compliant. Both devices are REACH Unaffected and classified under ECCN EAR99. Applications subject to RoHS regulatory requirements must use the CXE240D5 or identify alternative RoHS-compliant reed relay options.

Q: What load current capacity difference exists between these parts?

A: The MSS41A24 is rated for 2A maximum load current, while the CXE240D5 is rated for 5A. The substitute provides 2.5 times greater current capacity, allowing operation with higher-power loads or providing design margin for existing 2A applications.

Q: Is the CXE240D5 suitable for switching DC loads at 500VDC?

A: The CXE240D5 load voltage range is specified as 12 V ~ 280 V. This specification does not extend to 500VDC operation. Applications requiring 500VDC switching capability must identify alternative substitutes that explicitly support this voltage level.

Q: What is the moisture sensitivity classification for both parts?

A: Both the MSS41A24 and CXE240D5 are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or shelf life. These components do not require special moisture control measures during manufacturing or assembly.