JS1-B-18V-F Equivalent & Substitute Parts

Part Overview

The JS1-B-18V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring SPDT (1 Form C) contact configuration with 18VDC coil voltage and 10A contact rating. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The relay is designed for through-hole mounting with sealed construction and Class B coil insulation, suitable for industrial control and switching applications operating across -40°C to 85°C temperature range.

Substiute Parts

JS1-B-18V-F

Panasonic Electric WorksIn Stock: 867JS1-B-18V-F Datasheet

Current PartRFQ

ALQ118

Panasonic Electric WorksIn Stock: 1297ALQ118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JS1-B-18V-F is determined by the following critical parameters:

Primary Matching Criteria:

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

Secondary Compatibility Factors:

• Contact rating current: minimum 10A required
• Switching voltage: minimum 250VAC, 100VDC capability
• Operating temperature range: -40°C to 85°C minimum
• Seal rating: Sealed construction preferred
• Coil insulation: Class B or equivalent

The ALQ118 meets the primary matching criteria with identical coil voltage, contact form, mounting type, and termination style. However, the contact rating is reduced to 5A, representing a significant derating that must be evaluated against application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ALQ118 is an active product from the same manufacturer, providing continuity of supply for the obsolete JS1-B-18V-F. Both components share identical coil voltage, contact configuration, mounting methodology, and operating temperature specifications. Both are RoHS compliant with Class B coil insulation.

The primary design consideration is the reduced contact current rating of the ALQ118 (5A versus 10A). This substitution is applicable only when the application load current does not exceed 5A. The ALQ118 also exhibits reduced maximum DC switching voltage (30VDC versus 100VDC), which must be evaluated against circuit requirements.

The ALQ118 features Silver Nickel contact material compared to Silver Tin Oxide in the original part, with slightly lower coil resistance (810 Ohms versus 900 Ohms) and marginally higher coil current (22.2 mA versus 20 mA). These differences are within normal manufacturing tolerance ranges for general purpose relay applications.

The ALQ118 carries multiple approval certifications (CQC, cURuus, VDE) and is available in active inventory, supporting long-term design continuity.

Frequently Asked Questions (FAQ)

Q: Can the ALQ118 directly replace the JS1-B-18V-F in all applications?

A: Direct replacement is limited by the ALQ118's reduced contact current rating of 5A. The original part is rated for 10A. Substitution is valid only when application load current does not exceed 5A. The reduced DC switching voltage rating (30VDC maximum versus 100VDC) must also be verified against circuit specifications.

Q: What are the key electrical differences between these parts?

A: The primary differences are contact current rating (10A to 5A), maximum DC switching voltage (100VDC to 30VDC), and contact material composition (Silver Tin Oxide to Silver Nickel). Coil voltage, contact form, and operating temperature range are identical.

Q: Are both parts RoHS compliant?

A: Yes, both the JS1-B-18V-F and ALQ118 are RoHS compliant. The ALQ118 additionally carries CQC, cURuus, and VDE certifications.

Q: What is the packaging difference?

A: The JS1-B-18V-F is supplied in bulk packaging, while the ALQ118 is supplied in box packaging. This affects inventory management and handling procedures but does not impact electrical or mechanical compatibility.

Q: How do the coil specifications compare?

A: Both relays feature 18VDC non-latching coils with Class B insulation. The ALQ118 has slightly lower coil resistance (810 Ohms versus 900 Ohms) and marginally higher coil current (22.2 mA versus 20 mA). Must-operate and must-release voltages differ slightly but remain within acceptable operating margins.

Q: Is the ALQ118 suitable for new designs?

A: Yes. The ALQ118 is an active product with established supply chain availability. It is appropriate for new designs where the 5A contact rating and 30VDC maximum DC switching voltage meet application requirements.