ARX124H Equivalent & Substitute Parts

Part Overview

The ARX124H is a latching dual-coil RF relay manufactured by Panasonic Electric Works, designed for applications requiring SPDT (Single Pole Double Throw) switching at 500 mA contact rating and 4.5 VDC coil voltage. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The ARX124H operates with a 10 ms operate time and 6 ms release time, with gold-plated contacts rated for 30 VDC maximum switching voltage.

Substiute Parts

ARX124H

Panasonic Electric WorksIn Stock: 872ARX124H Datasheet

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ARN12A4H

Panasonic Electric WorksIn Stock: 816ARN12A4H Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ARX124H is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Coil voltage: 4.5 VDC (exact match required)
• Coil type: Latching, dual coil configuration
• Contact form: SPDT (1 Form C)
• Contact material: Gold plating
• Coil current: 88.9 mA
• Coil power: 400 mW
• Coil resistance: 50.6 Ohms

Mechanical Compatibility Criteria:

• Contact rating must support minimum 500 mA operation
• Must operate voltage: 3.38 VDC or lower
• Operating temperature range must encompass or exceed -40°C to 70°C

The ARN12A4H qualifies as a direct substitute based on matching all electrical parameters. However, substitution requires evaluation of mounting and termination differences, as the ARN12A4H uses surface mount technology with gull wing termination, whereas the ARX124H uses through-hole mounting with PC pins.

Parameter Comparison

Engineering Selection Recommendations

The ARN12A4H is electrically equivalent to the ARX124H across all specified coil and contact parameters. The ARX124H's obsolete status necessitates transition to the ARN12A4H for new procurement and long-term system support.

Key Considerations:

The ARN12A4H offers improved operating temperature range (-40°C to 85°C versus -40°C to 70°C) and faster switching response (5 ms operate and release times versus 10 ms and 6 ms). The component carries RoHS compliance certification and includes sealed flux protection, providing enhanced environmental protection.

Substitution requires PCB redesign due to mounting and termination differences. The ARX124H uses through-hole PC pins suitable for traditional PCB assembly, while the ARN12A4H uses surface-mount gull wing termination. Both components share identical electrical specifications, coil resistance, and power consumption, ensuring functional equivalence in circuit operation.

Frequently Asked Questions (FAQ)

Q: Can the ARN12A4H directly replace the ARX124H without circuit modification?

A: Electrical substitution is valid; however, PCB layout modification is required due to different mounting technologies. The ARX124H uses through-hole mounting with PC pins, while the ARN12A4H requires surface-mount footprint with gull wing pads. Coil voltage, current, and contact specifications are identical.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution is determined by matching coil voltage (4.5 VDC), coil type (latching dual coil), contact form (SPDT), coil current (88.9 mA), coil resistance (50.6 Ohms), and must-operate voltage (3.38 VDC). Contact material (gold plating) and coil power (400 mW) must also align.

Q: Does the ARN12A4H meet the same switching voltage and current ratings?

A: The ARN12A4H maintains the same coil specifications and contact material as the ARX124H. The ARX124H specifies 500 mA contact rating and 30 VDC maximum switching voltage. The ARN12A4H contact rating is not specified in available data; verification against application requirements is necessary.

Q: What is the impact of faster switching times in the ARN12A4H?

A: The ARN12A4H operates with 5 ms switching times (both operate and release) compared to the ARX124H's 10 ms operate and 6 ms release times. This represents faster response characteristics. Application timing requirements must be evaluated to confirm compatibility.

Q: Are there compliance or environmental differences between these parts?

A: The ARN12A4H is RoHS compliant and includes sealed flux protection. Both components carry EAR99 ECCN classification. The ARN12A4H supports an extended operating temperature range (-40°C to 85°C) compared to the ARX124H (-40°C to 70°C).