PRMA2A05B

Part Overview

The PRMA2A05B is a reed relay manufactured by Coto Technology, configured as a DPST (Double Pole Single Throw) relay with 500mA contact rating and 5VDC coil voltage. This part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and component procurement. The relay is designed for applications requiring low-voltage DC switching with PC pin termination and integrated coil protection via diode.

Substiute Parts

PRMA2A05B

Coto TechnologyIn Stock: 825PRMA2A05B Datasheet

Current PartRFQ

HE722A0610

Littelfuse Inc.In Stock: 837HE722A0610 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the PRMA2A05B must satisfy the following critical parameters that define functional equivalence:

• Coil Voltage: 5VDC (primary control parameter)
• Contact Form: DPST-NO configuration with 2 Form A contacts
• Contact Rating: Minimum 500 mA switching capacity
• Mounting Type: Through Hole with PC Pin termination
• Coil Type: Non Latching operation
• Features: Integrated coil protection diode

The HE722A0610 from Littelfuse Inc. is identified as a direct substitute based on matching these core electrical and mechanical parameters. Both components operate on identical coil voltage, provide equivalent contact switching capacity, share identical mounting and termination characteristics, and maintain equivalent switching performance within acceptable operational tolerances.

Parameter Comparison

Engineering Selection Recommendations

The HE722A0610 serves as the primary substitute for the obsolete PRMA2A05B. This recommendation is based on the following factors:

Product Status: The HE722A0610 maintains Active product status with current manufacturer support from Littelfuse Inc., ensuring ongoing availability and technical documentation access for designs requiring component replacement.

Compliance Certifications: Both components maintain equivalent regulatory compliance. The HE722A0610 meets ROHS3 Compliant standards, exceeding the original RoHS Compliant specification of the PRMA2A05B. Both components carry REACH Unaffected designation and EAR99 export classification, confirming compatibility with identical regulatory requirements.

Electrical Performance: The substitute component operates at identical coil voltage (5VDC) and contact switching capacity (500 mA), with must-operate and must-release voltage parameters matching the original specification. Minor variations in coil current (33.3 mA versus 35.8 mA) and coil resistance (150 Ohms versus 140 Ohms) remain within acceptable circuit design tolerance ranges. Extended operating temperature range (-40°C to 85°C versus -40°C to 80°C) provides enhanced thermal performance margin.

Mechanical Compatibility: Through-hole mounting with PC pin termination is identical between both components, ensuring direct PCB footprint compatibility without design modifications.

Frequently Asked Questions (FAQ)

Q: Can HE722A0610 directly replace PRMA2A05B in existing designs without PCB modification? A: Yes. Both components feature identical through-hole mounting with PC pin termination. Direct substitution on existing printed circuit boards is supported without layout or footprint changes.

Q: What are the key electrical differences between these components? A: Primary differences include coil current (PRMA2A05B: 35.8 mA; HE722A0610: 33.3 mA), coil resistance (PRMA2A05B: 140 Ohms; HE722A0610: 150 Ohms), operate/release time (PRMA2A05B: 0.5 ms; HE722A0610: 1 ms), and must-release voltage (PRMA2A05B: 0.8 VDC; HE722A0610: 0.5 VDC). These variations remain functionally equivalent for applications designed to the PRMA2A05B electrical specifications.

Q: What is the impact of switching voltage differences? A: The PRMA2A05B supports both 200VAC and 200VDC maximum switching voltage. The HE722A0610 specifies 200VDC maximum. For applications requiring 200VAC switching, circuit validation against the HE722A0610 datasheet specifications is necessary.

Q: Are compliance certifications equivalent between these components? A: Both components maintain REACH Unaffected status and EAR99 export classification. The HE722A0610 holds ROHS3 Compliant certification, which exceeds the RoHS Compliant specification of the PRMA2A05B, confirming regulatory equivalence for new design qualification.

Q: Is the longer operating temperature range of HE722A0610 beneficial? A: The HE722A0610 supports -40°C to 85°C operation versus -40°C to 80°C for the PRMA2A05B. This extended upper temperature limit provides additional design margin for applications approaching thermal limits.