JS1F-F-18V-F Equivalent & Substitute Parts

Part Overview

The JS1F-F-18V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a Single Pole Double Throw (SPDT) contact configuration with a 18VDC coil. This through-hole mounted relay is designed for applications requiring 10A contact switching capability at 250VAC or 100VDC maximum switching voltage. The part is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

JS1F-F-18V-F

Panasonic Electric WorksIn Stock: 1026JS1F-F-18V-F Datasheet

Current PartRFQ

ALQ1F18

Panasonic Electric WorksIn Stock: 975ALQ1F18 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the JS1F-F-18V-F is determined by the following critical parameters that must align with the original component specifications:

Primary Matching Criteria:

• Coil voltage: 18VDC (exact match required)
• Contact form: SPDT (1 Form C) configuration
• Mounting type: Through Hole
• Termination style: PC Pin
• Coil type: Non Latching

Secondary Compatibility Parameters:

• Contact rating current: Minimum 10A (equal or greater)
• Switching voltage: Minimum 250VAC and 100VDC capability
• Operating temperature range: Must encompass -40°C to 105°C or be compatible with application requirements
• Coil insulation class: Class F or equivalent

The ALQ1F18 substitute part meets the primary matching criteria with identical coil voltage, contact form, mounting type, and termination style. However, the contact rating current is reduced to 5A, which represents a functional limitation that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ALQ1F18 is an active product from Panasonic Electric Works and represents the primary substitute option for the obsolete JS1F-F-18V-F. Both components share identical coil voltage (18VDC), contact form (SPDT), mounting type (Through Hole), and termination style (PC Pin), establishing functional compatibility at the circuit interface level.

Selection of the ALQ1F18 as a substitute requires evaluation of the following parameter deviations:

Current Rating Reduction: The ALQ1F18 contact rating is 5A compared to the original 10A specification. Applications operating at or below 5A switching current are directly compatible. Applications requiring the full 10A capability must source alternative components or implement circuit modifications.

Switching Voltage Limitation: The ALQ1F18 maximum DC switching voltage is 30VDC compared to the original 100VDC specification. AC switching capability remains at 250VAC for both components. Applications limited to 30VDC DC switching are compatible; higher voltage applications require alternative solutions.

Temperature Range Reduction: The ALQ1F18 operating temperature range is -40°C to 85°C compared to the original -40°C to 105°C. Applications operating above 85°C require alternative components.

Timing Characteristics: The ALQ1F18 exhibits doubled operate and release times (20ms versus 10ms). Applications with timing-critical switching requirements must evaluate this parameter against system specifications.

Compliance Status: The ALQ1F18 carries ROHS3 compliance and holds certifications from CQC, cURuus, and VDE, providing enhanced regulatory coverage compared to the original RoHS Compliant designation.

Frequently Asked Questions (FAQ)

Q: Can the ALQ1F18 directly replace the JS1F-F-18V-F in all applications?

A: Direct replacement is possible only when application requirements do not exceed the ALQ1F18 parameter limits. The 5A contact rating, 30VDC maximum DC switching voltage, 85°C maximum operating temperature, and 20ms switching times must be compatible with the intended circuit function.

Q: What is the impact of the reduced contact rating from 10A to 5A?

A: The contact rating defines the maximum continuous current the relay contacts can safely switch. Applications operating at 5A or below are unaffected. Applications requiring 10A switching current must identify alternative components or implement parallel relay configurations if circuit design permits.

Q: How does the reduced DC switching voltage affect compatibility?

A: The ALQ1F18 supports 30VDC maximum DC switching compared to 100VDC for the original part. AC switching capability remains at 250VAC for both components. Applications limited to 30VDC DC switching are fully compatible. Higher voltage applications require alternative component selection.

Q: Are the coil drive requirements compatible between these parts?

A: The coil current increases from 20mA to 22.2mA, and the must-operate voltage increases from 12.6VDC to 14.6VDC. Existing drive circuits must be evaluated to confirm adequate current supply and voltage margin. The must-release voltage decreases from 1.8VDC to 0.9VDC, which may affect circuit behavior during power-down sequences.

Q: What packaging differences exist between these components?

A: The JS1F-F-18V-F is supplied in standard packaging, while the ALQ1F18 is packaged in boxes. Both components use PC Pin termination and through-hole mounting, ensuring mechanical compatibility on printed circuit boards.

Q: How do the operating temperature ranges compare?

A: The JS1F-F-18V-F operates from -40°C to 105°C, while the ALQ1F18 operates from -40°C to 85°C. Applications requiring operation above 85°C cannot use the ALQ1F18 as a substitute.

Q: What are the contact material differences?

A: The JS1F-F-18V-F uses Silver Tin Oxide (AgSnO) contacts, while the ALQ1F18 uses Silver Nickel (AgNi) contacts. Both materials are suitable for general purpose relay applications, though contact material selection affects switching characteristics and longevity under specific load conditions.