PRMA1C12 Reed Relay SPDT 250mA 12VDC Equivalent & Substitute Parts

Part Overview

The PRMA1C12 is a through-hole mounted reed relay manufactured by Coto Technology, configured as a single-pole double-throw (SPDT) switch with a 12VDC coil and 250mA contact rating. This component operates at a maximum switching voltage of 100VAC/100VDC with a coil resistance of 500 Ohms and non-latching coil type. The PRMA1C12 is classified as obsolete product status, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity.

Substiute Parts

PRMA1C12

Coto TechnologyIn Stock: 766PRMA1C12 Datasheet

Current PartRFQ

DIP12-1C90-51L

Standex-Meder ElectronicsIn Stock: 882DIP12-1C90-51L Datasheet

SimilarRFQ

HE721C1200

Littelfuse Inc.In Stock: 6261HE721C1200 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PRMA1C12 reed relay are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

• Coil voltage: 12VDC
• Contact form: SPDT (1 Form C)
• Coil type: Non Latching
• Mounting type: Through Hole
• Termination style: PC Pin
• Coil resistance: 500 Ohms
• Coil current: 24 mA

Secondary Compatibility Parameters:

• Contact rating current: 250 mA or higher
• Switching voltage: 100VAC/100VDC or higher
• Operating temperature range: Must encompass or exceed -40°C ~ 80°C
• Must operate voltage: 9 VDC or lower
• Must release voltage: 1 VDC or lower
• RoHS compliance status

Substitute parts meeting these criteria are classified as direct functional equivalents suitable for circuit replacement without design modification.

Parameter Comparison

Engineering Selection Recommendations

HE721C1200 (Littelfuse Inc.) - Primary Substitute

The HE721C1200 is the recommended direct substitute for the obsolete PRMA1C12. This part maintains identical contact rating (250mA), coil voltage (12VDC), and coil resistance (500 Ohms). The HE721C1200 features active product status with ROHS3 compliance and extended operating temperature range (-40°C ~ 85°C), providing superior thermal performance compared to the original specification. The must operate voltage (8 VDC) and must release voltage (1 VDC) parameters are equivalent to the PRMA1C12, ensuring compatible circuit operation. Switching voltage capability (175VDC) exceeds the original 100VDC specification, providing enhanced margin for high-voltage switching applications.

DIP12-1C90-51L (Standex-Meder Electronics) - Alternative Substitute

The DIP12-1C90-51L functions as an alternative substitute with enhanced current handling capability (500mA contact rating versus 250mA). This part maintains identical coil parameters (12VDC, 24mA, 500 Ohms) and non-latching coil type. The DIP12-1C90-51L offers improved switching voltage performance (175VAC/175VDC) and faster switching response (0.7ms operate time, 1.5ms release time). However, the operating temperature range (-20°C ~ 70°C) is narrower than the original specification, limiting suitability for applications requiring -40°C operation. The must release voltage (1.8 VDC) is higher than the PRMA1C12 specification (1 VDC), requiring circuit verification in applications with marginal release voltage conditions.

Compliance and Regulatory Status

Both substitute parts maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original PRMA1C12. RoHS compliance is upgraded to ROHS3 standard in both substitutes. Moisture sensitivity level remains at MSL 1 (Unlimited) across all three parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can the HE721C1200 directly replace the PRMA1C12 without circuit modification?

A: Yes. The HE721C1200 maintains identical coil voltage (12VDC), contact form (SPDT), contact rating (250mA), coil resistance (500 Ohms), and coil current (24mA). The through-hole PC pin termination is identical. The enhanced switching voltage (175VDC versus 100VDC) and extended temperature range (-40°C ~ 85°C) provide additional performance margin without requiring circuit changes.

Q: What is the key difference between the HE721C1200 and DIP12-1C90-51L substitutes?

A: The primary difference is contact rating current: HE721C1200 is rated 250mA (matching the original PRMA1C12), while DIP12-1C90-51L is rated 500mA. The DIP12-1C90-51L offers faster switching response (0.7ms operate time versus 3ms for HE721C1200) but has a narrower operating temperature range (-20°C ~ 70°C versus -40°C ~ 85°C). Select HE721C1200 for direct specification matching; select DIP12-1C90-51L for applications requiring higher current capacity and faster switching.

Q: Is the DIP12-1C90-51L suitable for applications operating at -40°C?

A: No. The DIP12-1C90-51L operating temperature range is -20°C ~ 70°C, which does not include -40°C operation. The HE721C1200 is the appropriate choice for applications requiring -40°C minimum operating temperature, as it specifies -40°C ~ 85°C.

Q: Are there packaging differences between these substitute parts?

A: The PRMA1C12 original specification does not include packaging detail. Both substitute parts are supplied in Tube packaging. Verify tube quantity requirements with procurement specifications before ordering.

Q: Do the substitute parts require different PCB footprints?

A: No. All three parts (PRMA1C12, HE721C1200, and DIP12-1C90-51L) use identical through-hole PC pin termination style, ensuring compatible PCB footprints without layout modification.

Q: What is the significance of the must operate and must release voltage specifications?

A: Must operate voltage (9 VDC for PRMA1C12, 8 VDC for HE721C1200, 8.4 VDC for DIP12-1C90-51L) defines the minimum coil voltage required to guarantee relay closure. Must release voltage (1 VDC for PRMA1C12 and HE721C1200, 1.8 VDC for DIP12-1C90-51L) defines the maximum coil voltage at which the relay is guaranteed to open. Both HE721C1200 and DIP12-1C90-51L have lower must operate voltages, providing improved sensitivity. The DIP12-1C90-51L higher must release voltage (1.8 VDC) requires verification in circuits with marginal release voltage conditions.

Q: Are RoHS compliance upgrades from RoHS to ROHS3 significant for this application?

A: ROHS3 represents current regulatory compliance with updated substance restrictions. Both substitute parts meet current environmental and regulatory requirements. The upgrade from RoHS to ROHS3 in the substitute parts reflects current manufacturing standards and ensures long-term supply chain compatibility.