JWD-172-7 Equivalent & Substitute Parts

Part Overview

The JWD-172-7 is a reed relay manufactured by TE Connectivity Potter & Brumfield Relays, designed for general-purpose switching applications requiring SPDT (Single Pole Double Throw) contact configuration. This relay operates at 12VDC coil voltage with a maximum contact rating of 500 mA and is suitable for through-hole PCB mounting. The part is currently active in production with RoHS3 compliance and maintains an extensive inventory of 1036 pieces in stock. Alternative equivalent parts may be required due to application-specific constraints, supply chain considerations, or performance parameter requirements that differ from the primary specification.

Substiute Parts

JWD-172-7

TE Connectivity Potter & Brumfield RelaysIn Stock: 1078JWD-172-7 Datasheet

Current PartRFQ

HE721C1210

Littelfuse Inc.In Stock: 6657HE721C1210 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JWD-172-7 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 12VDC
• Contact Form: SPDT (1 Form C)
• Coil Type: Non Latching
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Current: 24 mA
• Coil Resistance: 500 Ohms

Allowable Variation Parameters:

• Contact Rating (Current): Substitute must equal or exceed the main part specification
• Switching Voltage (Max): Substitute must equal or exceed the main part specification
• Operating Temperature Range: Substitute must encompass or exceed the main part range
• Must Operate Voltage: Substitute must be equal to or lower than the main part specification
• Operate Time and Release Time: Substitutes with equal or faster response times are acceptable

The HE721C1210 from Littelfuse Inc. qualifies as an equivalent substitute based on matching all mandatory parameters while maintaining compatibility with the specified electrical and mechanical requirements.

Parameter Comparison

Engineering Selection Recommendations

JWD-172-7 Selection Criteria: The JWD-172-7 is the primary choice for applications requiring the full 500 mA contact rating specification. This part maintains active production status with robust inventory availability (1036 pieces in stock) and meets all RoHS3 compliance requirements. The 28VDC maximum switching voltage and 1.5 ms operate time provide performance characteristics suitable for standard switching applications within the specified operating temperature range of -35°C to 85°C.

HE721C1210 Selection Criteria: The HE721C1210 serves as an equivalent substitute for applications where the contact current requirement does not exceed 250 mA. This Littelfuse part maintains identical coil voltage, contact form, and termination specifications while offering an extended operating temperature range (-40°C to 85°C) and superior switching voltage capability (175VDC maximum). The substitute part is ROHS3 compliant and REACH unaffected, with higher inventory availability (6594 pieces in stock). The HE721C1210 operates at a lower must-operate voltage (8 VDC versus 9.6 VDC), providing improved sensitivity in low-voltage applications.

Substitution Constraints: The HE721C1210 is not suitable for applications requiring contact currents exceeding 250 mA. Applications with critical timing requirements below 3 ms operate time should retain the JWD-172-7 specification.

Frequently Asked Questions (FAQ)

Q: Can the HE721C1210 replace the JWD-172-7 in all applications?

A: No. The HE721C1210 has a maximum contact rating of 250 mA, compared to the JWD-172-7's 500 mA rating. Substitution is valid only for applications where the contact current requirement does not exceed 250 mA. Verify the actual current load in your circuit before selecting the substitute part.

Q: What are the key electrical differences between these two relays?

A: The primary electrical differences are contact current rating (500 mA versus 250 mA), switching voltage capability (28VDC versus 175VDC), must-operate voltage (9.6 VDC versus 8 VDC), and operate time (1.5 ms versus 3 ms). All other electrical parameters, including coil voltage, coil current, coil resistance, and release voltage, are identical.

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

A: Yes. Both the JWD-172-7 and HE721C1210 use through-hole mounting with PC pin termination style, making them mechanically compatible with the same PCB layout and footprint.

Q: What is the temperature performance difference?

A: The HE721C1210 operates across a wider temperature range (-40°C to 85°C) compared to the JWD-172-7 (-35°C to 85°C). For applications requiring operation below -35°C, the HE721C1210 is the appropriate selection.

Q: Do both relays have the same coil specifications?

A: Yes. Both relays operate at 12VDC coil voltage with 24 mA coil current and 500 Ohms coil resistance. They are both non-latching types with integrated diodes.

Q: Which part should I select for a new design?

A: Select based on your application's actual contact current requirement. If the circuit requires 250 mA or less, either part is acceptable; the HE721C1210 offers extended temperature range and higher switching voltage capability. If the circuit requires more than 250 mA, the JWD-172-7 is mandatory.

Q: Are there any compliance differences between these parts?

A: Both parts are ROHS3 compliant. The HE721C1210 is additionally designated as REACH unaffected, while the JWD-172-7 has vendor-undefined REACH status. Both carry EAR99 ECCN classification.