PS7142-1A Solid State Relay - Equivalent & Substitute Parts

Part Overview

The PS7142-1A is a Solid State SPST-NO (1 Form A) relay manufactured by CEL in a 6-DIP package. This component operates with a 1.2VDC input and supports load voltages from 0V to 400V at 200mA with a maximum on-state resistance of 10 Ohms. The product is classified as obsolete, which necessitates identification of active substitute components that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Key Parameters

Parameter	PS7142-1A
Manufacturer	CEL
Circuit Type	SPST-NO (1 Form A)
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Termination Style	PC Pin
Voltage - Input	1.2VDC
Voltage - Load	0V ~ 400V
Load Current	200mA
On-State Resistance (Max)	10 Ohms
Output Type	AC, DC
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the PS7142-1A is determined by strict adherence to the following electrical and mechanical parameters: circuit topology (SPST-NO form), package type (6-DIP 0.300"), termination method (PC Pin through-hole), output type capability (AC/DC), and load handling specifications (voltage range and current capacity).

Substitute components are grouped into two categories based on load current and maximum load voltage compatibility:

Category 1 - Full Current/Voltage Compatibility (200mA, 0-400V): AQV254 and PLA140 meet or exceed the original load current of 200mA and support the full 400V load voltage range.

Category 2 - Reduced Voltage Range (200mA, 0-250V): AQV203 and LCA127 support 200mA load current but operate at a maximum load voltage of 250V.

Category 3 - Reduced Current (150mA, 0-400V): AQV204 and AQV254 support the full 400V load voltage range but at reduced load current of 150mA.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage - Input (VDC)	Voltage - Load (V)	Load Current (mA)	On-State Resistance Max (Ohms)	Product Status	RoHS Status
PS7142-1A	CEL	PS, OCMOS	1.2	0~400	200	10	Obsolete	Non-compliant
AQV203	Panasonic Electric Works	PhotoMOS™ AQV	2.3	0~250	200	8	Active	ROHS3 Compliant
AQV204	Panasonic Electric Works	PhotoMOS™ AQV	2.3	0~400	150	16	Active	ROHS3 Compliant
AQV253	Panasonic Electric Works	PhotoMOS™ AQV	1.14	0~250	200	8	Active	ROHS3 Compliant
AQV254	Panasonic Electric Works	PhotoMOS™ AQV	1.14	0~400	150	16	Active	ROHS3 Compliant
LCA127	Littelfuse	LCA, OptoMOS®	1.2	0~250	200	10	Active	ROHS3 Compliant
PLA140	IXYS Integrated Circuits Division	PLA, OptoMOS®	1.2	0~400	250	8	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

PLA140: Maintains identical input voltage (1.2VDC), supports full 400V load voltage range, exceeds load current capacity (250mA vs. 200mA), and achieves superior on-state resistance (8 Ohms vs. 10 Ohms). Product is active with ROHS3 compliance.
AQV254: Supports full 400V load voltage range with input voltage lower than original (1.14VDC vs. 1.2VDC), operating at reduced load current (150mA vs. 200mA). Product is active with ROHS3 compliance.

Secondary Substitutes (Load Voltage Limitation):

LCA127: Matches input voltage specification (1.2VDC) and maintains 200mA load current with identical on-state resistance (10 Ohms). Maximum load voltage is limited to 250V. Product is active with ROHS3 compliance.
AQV253: Operates at lower input voltage (1.14VDC), maintains 200mA load current with improved on-state resistance (8 Ohms). Maximum load voltage is limited to 250V. Product is active with ROHS3 compliance.

Alternative Substitutes (Current or Voltage Trade-offs):

AQV204: Supports full 400V load voltage range at reduced load current (150mA vs. 200mA). Input voltage requirement increased to 2.3VDC. Product is active with ROHS3 compliance.
AQV203: Operates at 200mA load current with improved on-state resistance (8 Ohms). Maximum load voltage limited to 250V and input voltage requirement increased to 2.3VDC. Product is active with ROHS3 compliance.

All substitute components share identical package geometry (6-DIP), termination style (PC Pin), and circuit topology (SPST-NO). All active substitutes achieve ROHS3 compliance, addressing the RoHS non-compliance status of the original PS7142-1A.

Frequently Asked Questions (FAQ)

Q: What determines if a part can replace the PS7142-1A? A: Direct replacements must maintain the same circuit topology (SPST-NO), package type (6-DIP 0.300"), termination style (PC Pin), and input voltage capability (1.2VDC or lower). Load voltage range and current capacity must equal or exceed the application requirements.

Q: Can I use a substitute with 150mA rating in place of a 200mA part? A: Parts with reduced current ratings (150mA) can replace the PS7142-1A only if the application load current does not exceed 150mA. Verify actual load current requirements before selection.

Q: What is the significance of the load voltage rating difference? A: Substitutes with lower maximum load voltage ratings (0-250V) cannot be used in applications requiring voltages above 250V. Select substitutes with 0-400V rating for full voltage range compatibility with the original specification.

Q: Does input voltage difference affect substitution? A: Input voltage differences must be verified against the circuit driving the relay. Parts with higher input voltage requirements (2.3VDC vs. 1.2VDC) may require circuit modification. Lower input voltage requirements generally present no compatibility issues.

Q: Why are all active substitutes RoHS3 compliant while the original is not? A: The PS7142-1A is classified as obsolete and was manufactured under previous regulatory requirements. All active substitutes are manufactured to current RoHS3 standards.

Q: Are all substitutes available in Through Hole mounting? A: Yes. All listed substitutes use Through Hole mounting with PC Pin termination, ensuring direct board-level compatibility with PS7142-1A footprints.

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