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JS1-B-48V-F Equivalent & Substitute Parts
Part Overview
The JS1-B-48V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a Single Pole Double Throw (SPDT) contact configuration with a 48VDC coil and 10A contact rating. This through-hole mounted relay is designed for applications requiring reliable switching of AC and DC loads. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and redesign applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Panasonic Electric Works |
| Part Number | JS1-B-48V-F |
| Coil Voltage | 48VDC |
| Contact Form | SPDT (1 Form C) |
| Contact Rating (Current) | 10 A |
| Switching Voltage | 250VAC, 100VDC - Max |
| Mounting Type | Through Hole |
| Coil Type | Non Latching |
| Operating Temperature Range | -40°C ~ 85°C |
| Product Status | Obsolete |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution compatibility for the JS1-B-48V-F is determined by the following critical parameters:
- Coil Voltage: Must be 48VDC to ensure proper operation within existing circuit designs
- Contact Form: Must be SPDT (1 Form C) to maintain switching functionality
- Mounting Type: Must be Through Hole to ensure PCB compatibility
- Coil Type: Must be Non Latching for consistent relay behavior
- Operating Temperature Range: Must encompass -40°C ~ 85°C or equivalent
- Contact Rating: Minimum 10A required for load switching capability
- Switching Voltage: Must support 250VAC and 100VDC maximum switching conditions
The ALQ148 meets the primary functional requirements of coil voltage, contact form, mounting type, and coil type. However, differences in contact rating and switching voltage specifications require engineering evaluation for specific applications.
Parameter Comparison
| Parameter | JS1-B-48V-F | ALQ148 | Compatibility Notes |
|---|---|---|---|
| Manufacturer | Panasonic Electric Works | Panasonic Electric Works | Same manufacturer |
| Coil Voltage | 48VDC | 48VDC | Identical |
| Contact Form | SPDT (1 Form C) | SPDT (1 Form C) | Identical |
| Contact Rating (Current) | 10 A | 5 A | ALQ148 rated at 50% of original |
| Switching Voltage - AC | 250VAC | 250VAC | Identical |
| Switching Voltage - DC | 100VDC | 30VDC | ALQ148 limited to 30% of original |
| Mounting Type | Through Hole | Through Hole | Identical |
| Coil Type | Non Latching | Non Latching | Identical |
| Operating Temperature Range | -40°C ~ 85°C | -40°C ~ 85°C | Identical |
| Coil Current | 7.5 mA | 8.3 mA | ALQ148 requires 10.7% higher coil current |
| Operate Time | 10 ms | 20 ms | ALQ148 operates at 2x speed |
| Release Time | 10 ms | 20 ms | ALQ148 releases at 2x speed |
| RoHS Status | RoHS Compliant | RoHS Compliant | Both compliant |
| Product Status | Obsolete | Active | ALQ148 actively manufactured |
Engineering Selection Recommendations
The ALQ148 is the designated substitute for the obsolete JS1-B-48V-F from Panasonic Electric Works. Both relays are manufactured by the same supplier and share identical coil voltage, contact form, mounting configuration, and operating temperature specifications.
Selection of ALQ148 as a replacement is supported by:
- Active product status with current manufacturing availability
- RoHS compliance matching the original specification
- Identical SPDT contact configuration and 48VDC coil voltage
- Through-hole mounting compatibility with existing PCB designs
- Equivalent operating temperature range
Applications requiring the full 10A contact rating or 100VDC switching capability of the original JS1-B-48V-F must evaluate the ALQ148's reduced specifications (5A contact rating, 30VDC maximum DC switching). The ALQ148 is suitable for applications within its rated parameters. Timing-sensitive applications must account for the doubled operate and release times (20 ms versus 10 ms).
Frequently Asked Questions (FAQ)
Q: Can ALQ148 directly replace JS1-B-48V-F in all applications?
A: ALQ148 is functionally compatible for coil voltage, contact form, and mounting type. However, applications requiring 10A continuous current or 100VDC switching must verify that ALQ148's 5A rating and 30VDC maximum are sufficient for the intended load.
Q: What is the impact of the different contact ratings?
A: JS1-B-48V-F is rated for 10A switching current, while ALQ148 is rated for 5A. Applications switching loads exceeding 5A require verification that the ALQ148 can safely handle the intended current without exceeding its contact rating.
Q: How do the switching voltage differences affect compatibility?
A: JS1-B-48V-F supports 100VDC maximum switching voltage, while ALQ148 supports 30VDC maximum. Applications switching DC loads above 30V require confirmation that ALQ148 meets the application requirements.
Q: Are the timing differences significant?
A: JS1-B-48V-F operates and releases in 10 ms, while ALQ148 operates and releases in 20 ms. Applications with timing-critical switching requirements must verify that the doubled response time is acceptable.
Q: Are both relays RoHS compliant?
A: Yes, both JS1-B-48V-F and ALQ148 are RoHS compliant, meeting environmental and regulatory requirements for electronic component manufacturing.
Q: What packaging is available for ALQ148?
A: ALQ148 is supplied in box packaging, differing from the original JS1-B-48V-F packaging specification.
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