D3402 Telecom Relay DPDT 2A 4.5V Equivalent & Substitute Parts

Part Overview

The D3402 is a telecom-grade double-pole double-throw (DPDT) relay manufactured by TE Connectivity Potter & Brumfield Relays, part of the FT2 and AXICOM series. This through-hole mounted relay operates at 4.5VDC with a 2A contact rating and is designed for telecom switching applications. The D3402 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

D3402

TE Connectivity Potter & Brumfield RelaysIn Stock: 893D3402 Datasheet

Current PartRFQ

TX2-4.5V

Panasonic Electric WorksIn Stock: 3502TX2-4.5V Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the D3402 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 4.5VDC
• Contact Form: DPDT (2 Form C)
• Contact Rating (Current): 2 A
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching
• Relay Type: Telecom

Operational Compatibility Parameters:

• Must Operate Voltage: 3.38 VDC (minimum activation threshold)
• Must Release Voltage: 0.45 VDC (maximum deactivation threshold)

The TX2-4.5V manufactured by Panasonic Electric Works satisfies all mandatory matching parameters and operational compatibility thresholds, establishing it as a direct functional equivalent for the obsolete D3402.

Parameter Comparison

Engineering Selection Recommendations

The TX2-4.5V from Panasonic Electric Works is the direct functional equivalent for the obsolete D3402. Selection of this substitute is supported by the following factors:

Product Status: The TX2-4.5V is classified as Active, ensuring ongoing availability and manufacturing support, whereas the D3402 is obsolete and subject to supply discontinuation.

Regulatory Compliance: The TX2-4.5V carries ROHS3 compliance certification, meeting current environmental and material restriction standards. Both parts maintain REACH Unaffected status and EAR99 export classification.

Electrical Equivalence: All critical electrical parameters align precisely: 4.5VDC coil voltage, DPDT contact configuration, 2A contact rating, and identical activation/deactivation thresholds (3.38VDC must-operate, 0.45VDC must-release).

Operational Improvements: The TX2-4.5V demonstrates faster switching performance (4 ms operate/release versus 5 ms) and reduced coil current consumption (31 mA versus 66.7 mA), providing efficiency gains in power-sensitive applications.

Temperature Consideration: The TX2-4.5V operating range (-40°C ~ 85°C) is narrower than the D3402 (-55°C ~ 85°C). Applications requiring operation below -40°C require evaluation of alternative substitutes or retention of D3402 inventory.

Switching Voltage Limitation: The TX2-4.5V maximum switching voltage is 220VDC only, compared to the D3402 specification of 250VAC and 220VDC. Applications switching 250VAC loads require confirmation that 220VDC maximum rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the TX2-4.5V directly replace the D3402 in existing circuit boards?

A: Yes, for applications within the specified operating parameters. Both relays share identical coil voltage (4.5VDC), contact configuration (DPDT), current rating (2A), mounting type (through-hole), and termination style (PC pin). Physical footprint compatibility must be confirmed through dimensional drawings, as this information was not provided in the component specifications.

Q: What is the impact of the lower operating temperature minimum for the TX2-4.5V?

A: The TX2-4.5V minimum operating temperature is -40°C, compared to -55°C for the D3402. If your application requires operation below -40°C, the TX2-4.5V is not suitable. Alternative substitutes or continued use of D3402 inventory must be evaluated for such applications.

Q: Why does the TX2-4.5V have higher coil resistance (145 Ohms vs. 67.5 Ohms)?

A: Higher coil resistance results in lower coil current consumption (31 mA versus 66.7 mA). This is a design characteristic of the Panasonic relay and provides improved power efficiency. The higher resistance does not affect functional compatibility, as both relays meet the same 4.5VDC activation and 3.38VDC must-operate specifications.

Q: Is the TX2-4.5V suitable for 250VAC switching applications?

A: No. The TX2-4.5V maximum switching voltage is 220VDC only. The D3402 supports 250VAC switching. If your application requires 250VAC switching capability, the TX2-4.5V is not compatible. Alternative substitutes must be identified.

Q: What is the significance of the TX2-4.5V being ROHS3 compliant?

A: ROHS3 compliance indicates the relay meets current European Union Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. This is a regulatory requirement for new component procurement in many markets. The D3402 compliance status was not specified.

Q: Are there packaging differences between the D3402 and TX2-4.5V?

A: Yes. The D3402 packaging is listed as "-" (not specified), while the TX2-4.5V is supplied in Tube packaging. Confirm that tube packaging is compatible with your assembly and storage requirements.

Q: How do the switching times compare?

A: The TX2-4.5V operates and releases faster (4 ms each) compared to the D3402 (5 ms each). This 1 ms improvement may be beneficial in time-sensitive switching applications but does not affect functional compatibility for standard telecom relay applications.

Q: What certifications apply to both relays?

A: Both the D3402 and TX2-4.5V carry EAR99 export classification and REACH Unaffected status. The TX2-4.5V additionally carries ROHS3 compliance. Both are classified as telecom-grade relays suitable for telecommunications switching applications.