JS1A-F-48V-F General Purpose Relay Equivalent & Substitute Parts

Part Overview

The JS1A-F-48V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a SPST-NO (1 Form A) contact configuration with a 48VDC coil. This through-hole mounted relay is designed for applications requiring single-pole, single-throw switching at 10A contact rating. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Key Parameters

Parameter	Value
Coil Voltage	48VDC
Contact Form	SPST-NO (1 Form A)
Contact Rating (Current)	10 A
Switching Voltage	250VAC, 100VDC - Max
Coil Current	7.5 mA
Mounting Type	Through Hole
Termination Style	PC Pin
Operating Temperature Range	-40°C ~ 105°C
Coil Insulation	Class F
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the JS1A-F-48V-F is determined by the following critical parameters:

Mandatory Matching Parameters:

Coil Voltage: 48VDC (exact match required)
Contact Form: SPST-NO (1 Form A) (exact match required)
Mounting Type: Through Hole (exact match required)
Termination Style: PC Pin (exact match required)

Allowable Variation Parameters:

Contact Rating (Current): Substitute must meet or exceed 10A requirement
Switching Voltage: Substitute must support minimum 250VAC and 100VDC switching capability
Coil Current: Lower values acceptable (reduced power consumption)
Operating Temperature Range: Substitute range must encompass or exceed -40°C ~ 105°C
Seal Rating: Variation acceptable based on application requirements

The ALQ3F48 substitute part matches all mandatory parameters but exhibits reduced contact current rating (5A versus 10A) and lower maximum switching voltage (30VDC versus 100VDC), restricting its use to applications within these reduced specifications.

Parameter Comparison

Parameter	JS1A-F-48V-F	ALQ3F48	Compatibility Notes
Manufacturer	Panasonic Electric Works	Panasonic Electric Works	Same manufacturer
Coil Voltage	48VDC	48VDC	Exact match
Contact Form	SPST-NO (1 Form A)	SPST-NO (1 Form A)	Exact match
Contact Rating (Current)	10 A	5 A	Substitute rated lower; application-dependent
Switching Voltage	250VAC, 100VDC - Max	250VAC, 30VDC - Max	Substitute has reduced DC switching capability
Coil Current	7.5 mA	4.2 mA	Substitute draws less coil current
Mounting Type	Through Hole	Through Hole	Exact match
Termination Style	PC Pin	PC Pin	Exact match
Coil Insulation	Class F	Class F	Exact match
Operating Temperature Range	-40°C ~ 105°C	-40°C ~ 85°C	Substitute has reduced upper temperature limit
Coil Resistance	6.4 kOhms	11.52 kOhms	Substitute has higher resistance
Contact Material	Silver Tin Oxide (AgSnO)	Silver Nickel (AgNi)	Different contact material composition
Product Status	Obsolete	Active	Substitute is currently in production
RoHS Status	RoHS Compliant	RoHS Compliant (inferred)	Both meet RoHS requirements

Engineering Selection Recommendations

The ALQ3F48 is an active production substitute for the obsolete JS1A-F-48V-F. Both parts are manufactured by Panasonic Electric Works and share identical coil voltage, contact form, mounting type, and termination style specifications.

Selection Criteria:

The ALQ3F48 is suitable for replacement in applications where:

Load current does not exceed 5A (versus original 10A rating)
DC switching voltage does not exceed 30VDC (versus original 100VDC rating)
Operating temperature remains within -40°C to 85°C (versus original -40°C to 105°C)

The ALQ3F48 is not suitable for replacement in applications requiring:

Contact current ratings above 5A
DC switching voltages above 30VDC
Operating temperatures above 85°C

The substitute part offers advantages in reduced coil current consumption (4.2mA versus 7.5mA) and active product status with ongoing manufacturer support. Both parts maintain RoHS compliance and Class F coil insulation specifications.

Frequently Asked Questions (FAQ)

Q: Can ALQ3F48 directly replace JS1A-F-48V-F in all applications?

A: No. The ALQ3F48 has reduced contact current rating (5A versus 10A) and lower maximum DC switching voltage (30VDC versus 100VDC). Substitution is valid only for applications operating within these reduced specifications.

Q: What is the primary reason to consider ALQ3F48 as a substitute?

A: The JS1A-F-48V-F is obsolete. The ALQ3F48 is an active production part from the same manufacturer with identical coil voltage, contact form, mounting type, and termination style, making it the primary equivalent for new designs or maintenance applications within its rated specifications.

Q: Are there packaging differences between these parts?

A: Yes. The JS1A-F-48V-F uses standard packaging, while the ALQ3F48 is supplied in box packaging. Both use PC pin termination suitable for through-hole PCB mounting.

Q: How do the operating temperature ranges differ?

A: The JS1A-F-48V-F operates from -40°C to 105°C, while the ALQ3F48 operates from -40°C to 85°C. Applications requiring operation above 85°C cannot use the ALQ3F48 substitute.

Q: What is the difference in contact material between these relays?

A: The JS1A-F-48V-F uses Silver Tin Oxide (AgSnO) contacts, while the ALQ3F48 uses Silver Nickel (AgNi) contacts. Both materials are suitable for general purpose switching applications within their respective rated specifications.

Q: Does the ALQ3F48 require any circuit modifications for substitution?

A: Circuit modifications depend on application requirements. If the original application requires 10A contact current or 100VDC switching capability, the ALQ3F48 cannot be used without redesign. If application requirements are within ALQ3F48 specifications, no modifications are necessary.

Q: Are both parts RoHS compliant?

A: Yes. Both the JS1A-F-48V-F and ALQ3F48 are RoHS compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

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