CM1-P-12V Equivalent & Substitute Parts

Part Overview

The CM1-P-12V is an automotive SPDT relay manufactured by Panasonic Electric Works, rated for 35A at 12VDC with a sealed, fully enclosed design. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The relay features non-latching coil operation, cadmium-free silver alloy contacts, and through-hole PC pin termination suitable for automotive applications.

Substiute Parts

CM1-P-12V

Panasonic Electric WorksIn Stock: 809CM1-P-12V Datasheet

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CB1-P-12V

Panasonic Electric WorksIn Stock: 18884CB1-P-12V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The CB1-P-12V qualifies as a functional substitute for the CM1-P-12V based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Coil voltage: 12VDC (identical)
• Contact form: SPDT (1 Form C) (identical)
• Mounting type: Through Hole (identical)
• Termination style: PC Pin (identical)
• Operating temperature range: -40°C ~ 85°C (identical)
• Contact material: Silver Alloy, Cadmium Free (identical)
• Features: Sealed - Fully (identical)
• Coil type: Non Latching (identical)
• Must Operate Voltage: 7 VDC (identical)
• Must Release Voltage: 1.2 VDC (identical)
• Switching Voltage: 14VDC - Nom (identical)
• REACH Status: REACH Unaffected (identical)
• ECCN: EAR99 (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)

Allowable Variations:

• Contact rating: 40A (CB1-P-12V) versus 35A (CM1-P-12V) — higher rating is acceptable for applications requiring the original 35A specification
• Coil current: 117 mA (CB1-P-12V) versus 125 mA (CM1-P-12V) — within acceptable tolerance
• Operate/Release time: 15 ms (CB1-P-12V) versus 10 ms (CM1-P-12V) — acceptable for automotive relay applications
• Coil power: 1.4W (CB1-P-12V) versus 1.5W (CM1-P-12V) — within acceptable tolerance
• Coil resistance: 103 Ohms (CB1-P-12V) versus 96 Ohms (CM1-P-12V) — within acceptable tolerance

Parameter Comparison

Engineering Selection Recommendations

The CB1-P-12V is suitable as a direct substitute for the CM1-P-12V in applications requiring a 12VDC automotive SPDT relay. The substitute part offers the advantage of active product status, ensuring long-term availability and supply chain continuity. The CB1-P-12V meets or exceeds the electrical specifications of the original part, with a higher contact current rating (40A versus 35A) and improved compliance status (ROHS3 Compliant). The marginal differences in coil current, operate/release time, and coil resistance remain within acceptable engineering tolerances for automotive relay applications. Both parts maintain identical environmental operating ranges, contact materials, and sealing characteristics required for automotive use.

Frequently Asked Questions (FAQ)

Q: Can the CB1-P-12V replace the CM1-P-12V in existing designs?

A: Yes. The CB1-P-12V maintains identical coil voltage (12VDC), contact form (SPDT), mounting type (Through Hole), and termination style (PC Pin). The substitute part operates within the same voltage thresholds and temperature range, making it functionally compatible for direct substitution.

Q: What are the key differences between these two relays?

A: The primary differences are product status (CB1-P-12V is active; CM1-P-12V is obsolete), contact current rating (40A versus 35A), and switching response time (15 ms versus 10 ms). The CB1-P-12V also carries ROHS3 compliance certification. These differences do not affect functional compatibility for applications designed for the original 35A specification.

Q: Are the coil resistance values different enough to affect circuit design?

A: No. The coil resistance difference (103 Ohms for CB1-P-12V versus 96 Ohms for CM1-P-12V) represents a 7.3% variation, which falls within standard engineering tolerance for relay coil circuits. Both parts operate at identical 12VDC coil voltage with comparable power consumption (1.4W versus 1.5W).

Q: Does the 5 ms difference in operate/release time matter?

A: The CB1-P-12V operates with 15 ms switching time compared to the CM1-P-12V's 10 ms. This 5 ms difference is acceptable for automotive relay applications where switching response is not time-critical. Applications requiring faster response should evaluate timing requirements against the substitute part's specifications.

Q: What is the packaging difference between these parts?

A: The CM1-P-12V is supplied in standard packaging, while the CB1-P-12V is supplied in bulk packaging. Both use identical through-hole PC pin termination and mounting configuration.

Q: Are both parts compliant with automotive and environmental standards?

A: Yes. Both parts are REACH Unaffected and classified as EAR99 for export control purposes. The CB1-P-12V additionally carries ROHS3 compliance certification. Both maintain MSL 1 (Unlimited) moisture sensitivity rating, suitable for automotive environments.