JS1A-B-48V-F Equivalent & Substitute Parts

Part Overview

The JS1A-B-48V-F 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 48VDC coil. This through-hole mounted relay is rated for 10A continuous contact current and features sealed construction with Class B coil insulation. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where this relay specification remains applicable.

Substiute Parts

JS1A-B-48V-F

Panasonic Electric WorksIn Stock: 934JS1A-B-48V-F Datasheet

Current PartRFQ

ALQ348

Panasonic Electric WorksIn Stock: 1184ALQ348 Datasheet

SimilarRFQ

J107F1AS1248VDC.36

CIT Relay and SwitchIn Stock: 979J107F1AS1248VDC.36 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JS1A-B-48V-F is determined by strict alignment with the following critical parameters:

• Coil Voltage: Must be 48VDC to ensure direct compatibility with existing circuit designs
• Contact Form: Must be SPST-NO (1 Form A) to maintain identical switching functionality
• Mounting Type: Must be Through Hole to ensure PCB compatibility
• Termination Style: Must be PC Pin for direct connection to printed circuit boards
• Coil Type: Must be Non Latching to preserve operational behavior

Two substitute parts meet these core requirements with documented variations in contact current rating, switching voltage capability, and operating temperature range. These variations are acceptable within the substitution framework as they represent enhanced or equivalent performance characteristics while maintaining the fundamental electrical and mechanical interface.

Parameter Comparison

Engineering Selection Recommendations

ALQ348 Substitution Considerations

The ALQ348 is an active product from Panasonic Electric Works with identical coil voltage, contact form, mounting type, and termination style. However, the contact current rating is reduced to 5A compared to the 10A specification of the JS1A-B-48V-F. This substitute is suitable only for applications where the load current does not exceed 5A. The ALQ348 features lower coil current (4.2 mA versus 7.5 mA) and extended operate/release times (20 ms each). The maximum switching voltage for DC is limited to 30VDC. Selection of this part requires confirmation that application requirements align with the reduced current rating and switching voltage specifications.

J107F1AS1248VDC.36 Substitution Considerations

The J107F1AS1248VDC.36 is an active product from CIT Relay and Switch that exceeds the contact current rating at 12A, providing enhanced capacity beyond the original 10A specification. This part maintains identical coil voltage, contact form, mounting type, and termination style. The J107F1AS1248VDC.36 offers superior switching voltage capability (380VAC, 110VDC maximum) and an extended operating temperature range (-55°C to 125°C). Coil resistance matches the original specification at 6.4 kOhms. The part features Class F coil insulation, which provides higher temperature capability than the Class B insulation of the original. Both the main part and this substitute use Silver Tin Oxide contact material and feature fully sealed construction. RoHS compliance is confirmed. This substitute provides direct functional replacement with enhanced performance margins.

Frequently Asked Questions (FAQ)

Q: Can the ALQ348 be used as a direct replacement for the JS1A-B-48V-F?

A: The ALQ348 shares the same coil voltage (48VDC), contact form (SPST-NO), mounting type (Through Hole), and termination style (PC Pin). However, the contact current rating is 5A compared to 10A for the original part. Direct replacement is possible only if the application load current does not exceed 5A. If the circuit requires 10A switching capacity, the ALQ348 is not suitable.

Q: What are the key differences between the J107F1AS1248VDC.36 and the JS1A-B-48V-F?

A: Both parts share identical coil voltage (48VDC), contact form (SPST-NO), mounting type (Through Hole), and termination style (PC Pin). The J107F1AS1248VDC.36 provides higher contact current capacity (12A versus 10A), higher maximum switching voltage (380VAC/110VDC versus 250VAC/100VDC), and an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C). The J107F1AS1248VDC.36 features Class F coil insulation compared to Class B in the original.

Q: Why is the JS1A-B-48V-F marked as obsolete?

A: The JS1A-B-48V-F is listed as obsolete by Panasonic Electric Works. Both substitute parts (ALQ348 and J107F1AS1248VDC.36) are active products currently in production and available for new designs and system maintenance.

Q: Are there any packaging differences between these parts?

A: The JS1A-B-48V-F uses standard packaging. The ALQ348 is supplied in Box packaging, while the J107F1AS1248VDC.36 is supplied in Tube packaging. These packaging differences do not affect electrical or mechanical compatibility.

Q: What is the impact of different coil resistance values on circuit design?

A: The JS1A-B-48V-F and J107F1AS1248VDC.36 both have 6.4 kOhms coil resistance. The ALQ348 has 11.52 kOhms coil resistance, which results in lower coil current (4.2 mA versus 7.5 mA). If the circuit includes coil current sensing or protection circuits, the ALQ348 substitution requires verification that the reduced coil current does not affect circuit operation.

Q: Can these parts be used interchangeably in existing PCB designs?

A: All three parts use identical Through Hole mounting and PC Pin termination, making them mechanically compatible with existing PCB layouts. Electrical compatibility depends on the specific application requirements regarding contact current rating, switching voltage, and operating temperature range.