Equivalent & Substitute Parts for JS1A-12V

Part Overview

The JS1A-12V is a general purpose relay manufactured by Panasonic Electric Works, configured as a Single Pole Single Throw Normally Open (SPST-NO) contact form with a 12VDC coil. This through-hole mounted relay is rated for 10A at 250VAC or 100VDC maximum switching voltage. The part is currently obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Coil Voltage	12VDC
Contact Form	SPST-NO (1 Form A)
Contact Rating (Current)	10 A
Switching Voltage	250VAC, 100VDC - Max
Coil Current	30 mA
Mounting Type	Through Hole
Termination Style	PC Pin
Coil Resistance	400 Ohms
Operating Temperature	-40°C ~ 70°C
Seal Rating	Sealed - Fully

Substitute Part Grouping Explanation

Substitution eligibility for the JS1A-12V is determined by the following critical parameters:

Coil Voltage: Must be 12VDC
Contact Form: Must be SPST-NO (1 Form A)
Coil Current: Must be 30 mA
Mounting Type: Must be Through Hole
Termination Style: Must be PC Pin
Coil Resistance: Must be 400 Ohms

The identified substitute parts meet these core electrical and mechanical requirements. Variations in contact current rating, switching voltage, operating temperature range, and contact material are permissible within the constraints of the application circuit design.

Parameter Comparison

Parameter	JS1A-12V (Main)	J1071AS12VDC.36	T7CS1D-12
Manufacturer	Panasonic Electric Works	CIT Relay and Switch	TE Connectivity Potter & Brumfield Relays
Product Status	Obsolete	Active	Active
Coil Voltage	12VDC	12VDC	12VDC
Contact Form	SPST-NO (1 Form A)	SPST-NO (1 Form A)	SPST-NO (1 Form A)
Contact Rating (Current)	10 A	15 A	12 A
Switching Voltage - Max	250VAC, 100VDC	125VAC, 30VDC	240VAC, 28VDC
Coil Current	30 mA	30 mA	30 mA
Coil Resistance	400 Ohms	400 Ohms	400 Ohms
Must Operate Voltage	8.4 VDC	9 VDC	9 VDC
Must Release Voltage	1.2 VDC	1.2 VDC	0.6 VDC
Operate Time	10 ms	10 ms	10 ms
Release Time	10 ms	10 ms	5 ms
Operating Temperature	-40°C ~ 70°C	-40°C ~ 125°C	-30°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Seal Rating	Sealed - Fully	Sealed - Fully	Sealed - Fully
Contact Material	Silver Alloy	Silver Tin Oxide (AgSnO)	Silver Cadmium Oxide (AgCdO)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

J1071AS12VDC.36 (CIT Relay and Switch): This substitute is currently in active production status with ROHS3 compliance. It provides a higher current rating (15A versus 10A) and extended operating temperature range (-40°C to 125°C). The lower maximum switching voltage (125VAC, 30VDC) requires circuit-level verification if the original design operates above these thresholds.

T7CS1D-12 (TE Connectivity Potter & Brumfield Relays): This substitute is in active production with a 12A current rating, closely matching the original 10A specification. It offers higher maximum switching voltage (240VAC, 28VDC) and faster release time (5ms versus 10ms). RoHS applicability is undefined by the vendor. The lower must-release voltage (0.6VDC versus 1.2VDC) may affect circuit behavior in applications with marginal release conditions.

Both substitutes maintain identical coil voltage, contact form, coil current, coil resistance, and mounting configuration as the obsolete JS1A-12V.

Frequently Asked Questions (FAQ)

Q: Can J1071AS12VDC.36 be used in place of JS1A-12V without circuit modification?

A: J1071AS12VDC.36 meets all core electrical and mechanical substitution criteria. However, the maximum switching voltage is reduced from 250VAC/100VDC to 125VAC/30VDC. Circuit verification is required if the original design operates above these voltage levels.

Q: What is the difference in current rating between the substitutes and the original part?

A: JS1A-12V is rated at 10A. J1071AS12VDC.36 is rated at 15A, and T7CS1D-12 is rated at 12A. Both substitutes exceed the original rating, providing margin for the same application loads.

Q: Are there packaging differences between these relays?

A: All three relays use through-hole PC pin termination. J1071AS12VDC.36 is supplied in box packaging. JS1A-12V and T7CS1D-12 packaging information is not specified in the available data.

Q: How do the operating temperature ranges compare?

A: JS1A-12V operates from -40°C to 70°C. J1071AS12VDC.36 extends to 125°C, and T7CS1D-12 operates to 85°C. Applications requiring operation above 70°C should use J1071AS12VDC.36.

Q: What is the significance of the must-release voltage difference in T7CS1D-12?

A: T7CS1D-12 has a must-release voltage of 0.6VDC compared to 1.2VDC for JS1A-12V. This means T7CS1D-12 releases at a lower coil voltage. In circuits with marginal release conditions, this difference may affect timing or reliability.

Q: Which substitute has better compliance status?

A: J1071AS12VDC.36 is ROHS3 compliant. T7CS1D-12 has undefined RoHS applicability. The original JS1A-12V is RoHS non-compliant. Applications requiring RoHS compliance should use J1071AS12VDC.36.

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