JWD-172-4 Equivalent & Substitute Parts

Part Overview

The JWD-172-4 is a reed relay manufactured by TE Connectivity Potter & Brumfield Relays, designed for general-purpose switching applications requiring SPDT contact configuration at 24VDC coil voltage. This through-hole mounted relay operates with a maximum contact current rating of 500 mA and features ruthenium contacts for reliable switching performance across industrial temperature ranges. The part is currently active in production with RoHS3 compliance and REACH unaffected status. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component interchangeability in circuit designs.

Substiute Parts

JWD-172-4

TE Connectivity Potter & Brumfield RelaysIn Stock: 1286JWD-172-4 Datasheet

Current PartRFQ

HE721C2400

Littelfuse Inc.In Stock: 1223HE721C2400 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the JWD-172-4 are identified based on alignment of critical electrical and mechanical parameters that determine functional compatibility. The primary substitution criteria include:

Mandatory Matching Parameters:

• Coil Voltage: 24VDC
• Contact Form: SPDT (1 Form C)
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching

Compatible Parameter Ranges:

• Contact Rating (Current): Equal to or greater than 250 mA minimum
• Switching Voltage: Sufficient for application requirements
• Operating Temperature Range: Encompasses or exceeds -35°C ~ 85°C
• Regulatory Compliance: RoHS3 Compliant, REACH Unaffected

The HE721C2400 from Littelfuse Inc. meets the mandatory matching parameters and operates within compatible electrical ranges, though with reduced contact current rating (250 mA versus 500 mA) and extended switching voltage capability (175VDC maximum).

Parameter Comparison

Engineering Selection Recommendations

JWD-172-4 Selection Criteria: The JWD-172-4 is the primary choice for applications requiring 500 mA contact current capacity with 28VDC maximum switching voltage. This part maintains active production status with full RoHS3 compliance and REACH unaffected regulatory standing. The 1.5 ms operate time provides faster switching response compared to substitute options.

HE721C2400 Selection Criteria: The HE721C2400 serves as a functional substitute for applications where contact current requirements do not exceed 250 mA. This part offers extended switching voltage capability (175VDC maximum) and lower must-operate voltage threshold (16 VDC versus 19.2 VDC), making it suitable for lower-voltage control circuits. Both parts maintain identical RoHS3 and REACH compliance status, ensuring regulatory equivalence. The HE721C2400 operates across a wider temperature range (-40°C ~ 85°C) compared to the main part.

Substitution Applicability: Direct substitution of HE721C2400 for JWD-172-4 is limited to circuits where maximum contact current does not exceed 250 mA. Applications requiring the full 500 mA contact rating must use the JWD-172-4 or identify alternative parts with equivalent current capacity.

Frequently Asked Questions (FAQ)

Q: Can the HE721C2400 replace the JWD-172-4 in all applications?

A: No. The HE721C2400 has a maximum contact current rating of 250 mA, while the JWD-172-4 is rated for 500 mA. Substitution is only valid for applications where the actual switching current does not exceed 250 mA.

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

A: The primary differences are contact current rating (500 mA versus 250 mA), switching voltage maximum (28VDC versus 175VDC), must-operate voltage (19.2 VDC versus 16 VDC), and operate time (1.5 ms versus 3 ms). Both parts share identical 24VDC coil voltage, SPDT contact form, and non-latching coil type.

Q: Are both parts physically compatible with the same PCB footprint?

A: Yes. Both parts feature through-hole mounting with PC pin termination style, enabling installation in identical PCB layouts. Physical package dimensions are not provided in the specification data; verify mechanical compatibility through manufacturer datasheets if required.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the JWD-172-4 and HE721C2400 are RoHS3 compliant and REACH unaffected, ensuring equivalent regulatory standing for applications subject to these compliance frameworks.

Q: What is the impact of the different operate times?

A: The JWD-172-4 operates in 1.5 ms while the HE721C2400 requires 3 ms. Applications with timing-critical switching requirements must account for this 1.5 ms difference in response time.

Q: Can the HE721C2400 be used in circuits designed for the JWD-172-4's lower must-operate voltage?

A: Yes. The HE721C2400 has a lower must-operate voltage (16 VDC versus 19.2 VDC), meaning it will reliably operate at lower coil voltages. This characteristic does not prevent substitution in circuits designed for the JWD-172-4.