PS7142-2B-A Solid State Relay SPST-NC Equivalent & Substitute Parts

Part Overview

The PS7142-2B-A is a solid state relay (SSR) manufactured by CEL, configured as a SPST-NC (1 Form B) dual-channel device in an 8-DIP through-hole package. This component is rated for 200 mA load current across 0–400 V AC/DC output voltage with 1.2 VDC input control voltage. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.

Substiute Parts

PS7142-2B-A

CELIn Stock: 1087PS7142-2B-A Datasheet

Current PartRFQ

AQW454

Panasonic Electric WorksIn Stock: 2317AQW454 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS7142-2B-A is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Circuit configuration: SPST-NC (1 Form B) x 2 channels
• Package type: 8-DIP (0.300", 7.62mm)
• Mounting type: Through hole with PC pin termination
• Load voltage range: 0 V ~ 400 V AC/DC
• Input control voltage: Compatible with 1.2 VDC nominal
• Output type: AC and DC switching capability

Allowable Variation Parameters:

• Load current: Substitute must support minimum 200 mA; lower ratings are not acceptable
• On-state resistance: Substitute must not exceed 12 Ohms maximum
• Input voltage: Substitute input voltage must be compatible with 1.2 VDC control signal

The AQW454 (Panasonic Electric Works PhotoMOS™ AQW series) meets the package, circuit configuration, and voltage specifications. However, the load current rating of 120 mA is below the 200 mA requirement of the PS7142-2B-A, making this substitute suitable only for applications where the actual load current does not exceed 120 mA.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Load Current Rating

The AQW454 substitute is rated for 120 mA maximum load current, compared to the PS7142-2B-A specification of 200 mA. Selection of the AQW454 is valid only when the actual circuit load current does not exceed 120 mA. Applications requiring the full 200 mA capacity must source alternative parts or the original PS7142-2B-A from available inventory.

Product Status and Availability

The PS7142-2B-A is classified as obsolete. The AQW454 is an active product currently manufactured by Panasonic Electric Works, ensuring long-term availability and supply chain continuity for new designs and ongoing production requirements.

Compliance and Certification

The AQW454 carries RoHS compliance certification, meeting current environmental and regulatory standards. Both parts share identical ECCN (EAR99) and HTSUS (8536.41.0030) classifications.

Electrical Compatibility

Input voltage specifications (1.2 VDC vs. 1.14 VDC) are compatible within standard control signal tolerances. Load voltage range (0–400 V AC/DC) and circuit configuration (SPST-NC dual-channel) are identical. On-state resistance of the AQW454 (16 Ohms maximum) is higher than the PS7142-2B-A (12 Ohms maximum) but remains within acceptable operating parameters for most applications.

Package and Mounting

Both parts use identical 8-DIP (0.300", 7.62mm) through-hole packages with PC pin termination, enabling direct socket substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the AQW454 directly replace the PS7142-2B-A in all applications?

A: Direct replacement is possible only when the actual load current does not exceed 120 mA. The AQW454 is rated for 120 mA maximum, while the PS7142-2B-A is rated for 200 mA. Applications requiring higher current capacity must use alternative parts.

Q: Are the pin configurations identical between PS7142-2B-A and AQW454?

A: Yes. Both parts use the 8-DIP (0.300", 7.62mm) package with PC pin termination. Pin-for-pin compatibility is confirmed, allowing direct socket substitution without PCB modification.

Q: What is the impact of the higher on-state resistance in the AQW454?

A: The AQW454 has a maximum on-state resistance of 16 Ohms compared to 12 Ohms for the PS7142-2B-A. This 4-Ohm difference results in slightly higher voltage drop across the relay contacts during conduction. For most applications, this difference is negligible; however, circuits with tight voltage margin specifications should verify compatibility through load testing.

Q: Is the AQW454 suitable for new product designs?

A: Yes. The AQW454 is an active product with current manufacturing status and RoHS compliance, making it suitable for new designs. However, load current requirements must not exceed 120 mA.

Q: What is the difference in input voltage between these parts?

A: The PS7142-2B-A requires 1.2 VDC input, while the AQW454 requires 1.14 VDC input. This 0.06 VDC difference is within standard control signal tolerances and does not affect practical compatibility in typical applications.

Q: Can both parts handle AC and DC loads?

A: Yes. Both the PS7142-2B-A and AQW454 are rated for AC and DC output switching across the 0–400 V load voltage range.

Q: What is the moisture sensitivity level of the AQW454?

A: The AQW454 has a moisture sensitivity level (MSL) classification of "Not Applicable," indicating no moisture-related handling restrictions. The PS7142-2B-A has MSL 1 (Unlimited), also indicating no moisture sensitivity concerns.