PRMA1A12 Reed Relay SPST 500mA 12VDC - Equivalent & Substitute Parts

Part Overview

The PRMA1A12 is a single pole single throw (SPST) normally open reed relay manufactured by Coto Technology, rated for 500mA switching at 200VAC/200VDC maximum. The part is classified as obsolete product status. Finding equivalent substitute parts is necessary to ensure design continuity and maintain procurement availability for new manufacturing runs and field replacements.

Substiute Parts

PRMA1A12

Coto TechnologyIn Stock: 1661PRMA1A12 Datasheet

Current PartRFQ

8L01-12-001

Coto TechnologyIn Stock: 16138L01-12-001 Datasheet

DirectRFQ

DIP12-1A72-12L

Standex-Meder ElectronicsIn Stock: 842DIP12-1A72-12L Datasheet

SimilarRFQ

HE721A1200

Littelfuse Inc.In Stock: 2398HE721A1200 Datasheet

SimilarRFQ

JWD-107-3

TE Connectivity Potter & Brumfield RelaysIn Stock: 1031JWD-107-3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for reed relay SPST configurations is determined by the following critical parameters:

Mandatory matching criteria:

• Contact form (SPST-NO)
• Coil voltage (12VDC nominal)
• Mounting type (Through Hole)
• Termination style (PC Pin)
• Contact rating must be equal to or greater than 500mA

Performance compatibility parameters:

• Switching voltage capability must support 200VDC minimum
• Coil activation characteristics (must operate voltage, must release voltage)
• Response time specifications (operate and release times)
• Operating temperature range must encompass -40°C to 80°C or be compatible with application requirements

The substitute parts listed below satisfy these criteria with the following variations in secondary parameters: coil current consumption, coil resistance, and detailed timing characteristics.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitute (Primary Choice): 8L01-12-001 from Coto Technology is the direct Coto Technology equivalent with active product status. This part maintains the same switching voltage rating (200VAC/200VDC), contact form (SPST-NO), and contact current rating (500mA). The increased coil current (24mA vs 12mA) and reduced coil resistance (500 Ohms vs 1 kOhms) reflect updated design parameters but do not prevent substitution in standard applications.

Secondary Alternatives (Similar Compatibility): HE721A1200 (Littelfuse Inc., HE700 series) provides equivalent contact rating, coil voltage, and coil current specifications with active product status and RoHS3 compliance. The switching voltage is specified as 200VDC maximum (vs 200VAC/200VDC for the main part). Operating temperature range extends to 85°C, slightly exceeding the original specification. Response times are doubled (1ms operate/release vs 0.5ms).

DIP12-1A72-12L (Standex-Meder Electronics, DIP series) offers higher contact current rating (1A vs 500mA) with identical coil current and voltage specifications. The must release voltage increases to 1.8VDC and operating temperature range is -20°C to 70°C, which does not fully cover the original -40°C minimum. This part is suitable for applications where the lower temperature requirement is not critical.

JWD-107-3 (TE Connectivity Potter & Brumfield Relays, JWD series) meets the primary electrical requirements with lower coil current consumption (10mA). The switching voltage rating is limited to 100VDC maximum, restricting use in applications requiring 200VDC AC capability. Response times are slower (1.5ms operate/0.5ms release). Contact material is specified as ruthenium (Ru). This part is suitable only for circuits operating within 100VDC switching constraints.

All substitute parts maintain through-hole mounting and PC pin termination compatibility with the original design. Regulatory compliance (RoHS3, REACH Unaffected, EAR99 ECCN) is maintained across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PRMA1A12 with 8L01-12-001? A: Yes. The 8L01-12-001 is a direct Coto Technology equivalent with identical contact form, coil voltage, contact rating, and switching voltage specifications. It has active product status compared to the obsolete PRMA1A12. The higher coil current (24mA vs 12mA) requires verification that the driving circuit can supply the additional current.

Q: What is the difference between a direct substitute and a similar substitute? A: A direct substitute (8L01-12-001) matches the main part specifications across all critical parameters. Similar substitutes (HE721A1200, DIP12-1A72-12L, JWD-107-3) meet the fundamental SPST-NO 12VDC relay requirements but have variations in secondary parameters such as coil current, response times, or switching voltage limits.

Q: Can I use JWD-107-3 in an application requiring 200VAC switching capability? A: No. The JWD-107-3 has a maximum switching voltage rating of 100VDC. It is not suitable for circuits that require 200VAC or 200VDC switching capability.

Q: Does DIP12-1A72-12L work at -40°C operating temperature? A: The DIP12-1A72-12L is specified for -20°C to 70°C operating temperature. It is not rated for the original PRMA1A12 specification of -40°C minimum. Use this part only in applications where the -20°C minimum is acceptable.

Q: What is the impact of different coil currents between substitute parts? A: Coil current differences (10mA to 24mA) affect the power consumption and drive circuit design. Higher coil current (8L01-12-001 at 24mA) requires greater current capacity from the activation circuit. Lower coil current (JWD-107-3 at 10mA) reduces power dissipation. Verify that the existing drive circuit can supply the required coil current for your selected substitute.

Q: Are all substitute parts RoHS and REACH compliant? A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to or exceeding the original PRMA1A12 (RoHS compliant).

Q: What packaging options are available? A: 8L01-12-001 and HE721A1200 are supplied in tube packaging. DIP12-1A72-12L is supplied in tube packaging. JWD-107-3 is supplied in tray packaging. Verify packaging compatibility with your assembly processes and procurement systems.

Q: Can I use the higher current rating of DIP12-1A72-12L (1A vs 500mA) in place of PRMA1A12? A: Yes. A higher contact current rating (1A) provides compatibility with the original 500mA requirement. The part is suitable for applications not requiring the original -40°C operating temperature minimum.