JS1F-18V-F Equivalent & Substitute Parts

Part Overview

The JS1F-18V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a Single Pole Double Throw (SPDT) contact configuration with a 10A contact rating and 18VDC coil voltage. This through-hole mounted relay is designed for general switching applications requiring sealed, flux-protected contacts. The part is currently obsolete, making identification of compatible substitute components essential for system maintenance, repair, and redesign applications.

Substiute Parts

JS1F-18V-F

Panasonic Electric WorksIn Stock: 1254JS1F-18V-F Datasheet

Current PartRFQ

ALQ118

Panasonic Electric WorksIn Stock: 1297ALQ118 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JS1F-18V-F is determined by the following critical parameters:

• Coil Voltage: 18VDC (exact match required for direct circuit compatibility)
• Contact Form: SPDT (1 Form C) configuration (functional switching topology)
• Mounting Type: Through Hole with PC Pin termination (physical and electrical interface)
• Contact Rating: Minimum 10A at rated switching voltage (load capacity)
• Switching Voltage: Minimum 250VAC, 100VDC capability (application voltage envelope)
• Operating Temperature: Minimum -40°C ~ 70°C range (environmental specification)
• RoHS Compliance: Required for regulatory alignment

The ALQ118 meets these substitution criteria as a through-hole mounted SPDT relay with 18VDC coil voltage and PC Pin termination from the same manufacturer. However, specific parameter deviations exist and must be evaluated for application suitability.

Parameter Comparison

Engineering Selection Recommendations

The ALQ118 is a functionally compatible substitute for the obsolete JS1F-18V-F based on matching coil voltage (18VDC), contact configuration (SPDT), mounting type (through-hole PC pin), and regulatory compliance (RoHS). Both parts are manufactured by Panasonic Electric Works.

However, the ALQ118 exhibits reduced electrical ratings in two critical areas:

• Contact Current Rating: Reduced from 10A to 5A, limiting maximum load capacity to 50% of the original specification
• DC Switching Voltage: Reduced from 100VDC to 30VDC, restricting DC application envelope to 30% of the original capability

The ALQ118 is suitable for applications where load current does not exceed 5A and DC switching voltage remains below 30V. For applications requiring the full 10A current rating or 100VDC DC switching capability, alternative substitutes with higher electrical ratings must be evaluated.

The ALQ118 is currently in active production status, ensuring availability and supply chain continuity compared to the obsolete JS1F-18V-F.

Frequently Asked Questions (FAQ)

Q: Can the ALQ118 directly replace the JS1F-18V-F in all applications?

A: Direct replacement is possible only in applications where the load current does not exceed 5A and DC switching voltage remains below 30V. The ALQ118 has reduced electrical ratings compared to the original part. Applications requiring 10A current capacity or 100VDC switching capability require evaluation of alternative substitutes.

Q: What is the impact of the different coil current requirement (20 mA vs. 22.2 mA)?

A: The ALQ118 requires 11% higher coil current (22.2 mA versus 20 mA). This affects the design of the coil drive circuit. The driving circuit must supply sufficient current to reliably operate the ALQ118 coil.

Q: Why do the operate and release times differ between the two relays?

A: The ALQ118 has operate and release times of 20 ms compared to 10 ms for the JS1F-18V-F. This 2x difference in switching speed may impact applications with strict timing requirements. Applications sensitive to relay response time must account for this parameter difference.

Q: Are the contact materials compatible in terms of switching performance?

A: The JS1F-18V-F uses Silver Tin Oxide (AgSnO) contacts while the ALQ118 uses Silver Nickel (AgNi) contacts. Both are standard relay contact materials suitable for general switching applications. Contact material selection affects arc resistance and contact wear characteristics, but both materials are appropriate for the specified switching voltages and currents within their respective ratings.

Q: What is the significance of the different must-operate and must-release voltages?

A: The ALQ118 requires 14.6 VDC to operate (versus 12.6 VDC for the JS1F-18V-F) and releases at 0.9 VDC (versus 1.8 VDC for the JS1F-18V-F). These differences affect the voltage margin in the control circuit. The ALQ118 requires a higher minimum voltage to energize but releases more readily when de-energized.

Q: Is the extended operating temperature range of the ALQ118 (-40°C ~ 85°C) a significant advantage?

A: The ALQ118 extends the upper operating temperature limit to 85°C compared to 70°C for the JS1F-18V-F. This provides additional thermal margin for applications in elevated temperature environments. However, this advantage is only relevant if the application environment exceeds 70°C.

Q: Are both parts RoHS compliant?

A: Yes, both the JS1F-18V-F and ALQ118 are RoHS compliant, ensuring regulatory alignment for applications subject to RoHS requirements.