PRMA2A24 Reed Relay - Equivalent and Substitute Parts

Part Overview

The PRMA2A24 is a reed relay manufactured by Coto Technology, classified as a DPST (Double Pole Single Throw) 500mA 24VDC relay. This component features through-hole mounting with PC pin termination and is designed for applications requiring non-latching relay operation. The PRMA2A24 is designated as obsolete, making alternative component selection necessary for new designs and ongoing production support. The substitutes identified maintain functional equivalency across critical electrical parameters while offering active product status and improved availability.

Substiute Parts

PRMA2A24

Coto TechnologyIn Stock: 16187PRMA2A24 Datasheet

Current PartRFQ

8L02-24-00

Coto TechnologyIn Stock: 33728L02-24-00 Datasheet

DirectRFQ

HE722A2400

Littelfuse Inc.In Stock: 2301HE722A2400 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the PRMA2A24 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

• Coil Voltage: 24VDC (exact match required)
• Contact Form: DPST-NO configuration (2 Form A)
• Contact Rating: 500 mA minimum
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching
• Switching Voltage: 200VDC minimum capability

Allowable Parameter Variations:

• Must Operate Voltage: Range 16-19.2VDC (functional tolerance)
• Must Release Voltage: Maximum 2VDC (standard release specification)
• Operating Temperature Range: Extended or equivalent range
• Coil Current: Minor variations acceptable (11.1-12 mA)
• Coil Resistance: Minor variations acceptable (2.0-2.15 kOhms)
• Operate/Release Time: Variations within relay response characteristics
• RoHS Status: ROHS3 Compliant acceptable as equivalent to RoHS Compliant

Parameter Comparison

Engineering Selection Recommendations

8L02-24-00 (Coto Technology): This substitute is manufactured by the same supplier as the obsolete PRMA2A24, ensuring design continuity and proven manufacturing standards. The 8L02-24-00 holds active product status with current inventory of 3344 units. RoHS3 compliance exceeds the original RoHS Compliant specification. The operating temperature range (-20°C to 85°C) is more restrictive at the lower end but extends to higher temperatures. Must Operate Voltage specification of 19.2VDC is slightly higher than the original 18VDC. This part is the primary recommendation for direct substitution in applications where the lower temperature limit of -20°C is acceptable.

HE722A2400 (Littelfuse Inc.): This substitute from Littelfuse Inc. provides cross-manufacturer equivalency with active product status and strong inventory availability (2194 units). The operating temperature range (-40°C to 85°C) matches the original lower temperature limit, making it suitable for applications requiring extended cold-temperature operation. Must Operate Voltage specification of 16VDC is lower than the original 18VDC, providing greater operational margin in low-voltage conditions. Operate and Release Times are specified at 1 ms versus the original 0.5 ms; this is a secondary switching characteristic that must be evaluated in designs sensitive to relay response timing. ROHS3 compliance and REACH Unaffected status are satisfied. Switching voltage specification is limited to 200VDC maximum (VAC not listed); applications requiring 200VAC operation must use 8L02-24-00.

Compliance Summary: Both substitutes satisfy RoHS and REACH requirements. Packaging is Tube format for both alternatives, matching standard handling and storage practices.

Frequently Asked Questions (FAQ)

Q: Can I use HE722A2400 in applications requiring 200VAC operation? A: No. The HE722A2400 specifies 200VDC maximum switching voltage only. The 8L02-24-00 maintains the original specification of 200VAC, 200VDC and is required for AC switching applications.

Q: What is the operational impact of the different Must Operate Voltage specifications? A: The Must Operate Voltage determines the minimum coil voltage required to guarantee relay closure. The 8L02-24-00 specifies 19.2VDC (higher requirement), while the HE722A2400 specifies 16VDC (lower requirement). In designs with tight supply voltage margins, the HE722A2400 provides greater operational assurance at reduced supply voltages. The original PRMA2A24 specification was 18VDC.

Q: Does the 1 ms switching time of HE722A2400 affect my application? A: The Operate and Release Times differ: PRMA2A24 and 8L02-24-00 are specified at 0.5 ms, while HE722A2400 is specified at 1 ms. Applications requiring response times faster than 1 ms must use 8L02-24-00 or the original PRMA2A24. For general-purpose switching applications, the 1 ms specification is within typical relay switching characteristics and is often acceptable.

Q: What packaging format is provided for the substitute parts? A: Both 8L02-24-00 and HE722A2400 are supplied in Tube packaging, standard for through-hole relay distribution. This format is compatible with standard pick-and-place assembly equipment for production environments.

Q: Are there temperature limitations when selecting a substitute? A: The 8L02-24-00 operates from -20°C to 85°C, limiting use in applications below -20°C. The HE722A2400 operates from -40°C to 85°C, matching the original PRMA2A24 range. Applications requiring operation below -20°C must use HE722A2400 or verify that the -20°C minimum of 8L02-24-00 is acceptable for the intended use environment.

Q: How do coil current differences affect circuit design? A: Coil current specifications are 11.2 mA (PRMA2A24), 12 mA (8L02-24-00), and 11.1 mA (HE722A2400). These values are within normal manufacturing tolerances for 24VDC relay designs. Circuit designs using current-limiting series resistances or voltage dividers must account for these minor variations, though the differences are negligible for standard relay driver circuits.

Q: What is the significance of REACH Unaffected status? A: REACH Unaffected means the component is exempt from REACH Regulation compliance requirements, typically applicable to simple relay devices that are not subject to the regulation. All three parts listed share this status, confirming equivalency for regulatory purposes.

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