D3426 Telecom Relay DPDT 2A 12V Equivalent & Substitute Parts

Part Overview

The D3426 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 12VDC with a 2A contact rating and is designed for telecom switching applications. The D3426 is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance, repair, and new design implementations where legacy component compatibility is required.

Substiute Parts

D3426

TE Connectivity Potter & Brumfield RelaysIn Stock: 1184D3426 Datasheet

Current PartRFQ

TX2-12V

Panasonic Electric WorksIn Stock: 9161TX2-12V Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the D3426 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Coil voltage: 12VDC
• Contact form: DPDT (2 Form C)
• Contact rating: 2 A minimum
• Mounting type: Through hole
• Termination style: PC pin
• Coil type: Non latching
• Must operate voltage: 9 VDC
• Must release voltage: 1.2 VDC
• Relay type: Telecom

Acceptable Variation Parameters:

• Switching voltage: Substitute must meet or exceed 220VDC maximum
• Operating temperature range: Substitute may have narrower range if minimum is ≤ -40°C and maximum is ≥ 85°C
• Coil current: May vary within design specifications
• Operate/release time: May vary within acceptable switching performance
• Contact material composition: May differ while maintaining electrical performance
• Seal rating: May be enhanced (sealed vs. unsealed)
• Product status: Active status preferred for availability

The TX2-12V from Panasonic Electric Works meets all mandatory matching parameters and qualifies as a direct substitute for the D3426.

Parameter Comparison

Engineering Selection Recommendations

The TX2-12V from Panasonic Electric Works is a direct functional equivalent to the obsolete D3426 relay. Selection of the TX2-12V is supported by the following factors:

Functional Equivalence: The TX2-12V matches all mandatory electrical and mechanical parameters required for direct substitution in applications originally designed for the D3426. Both relays operate identically as DPDT telecom switching devices at 12VDC with 2A contact rating and identical voltage thresholds.

Product Status: The TX2-12V is classified as active, ensuring ongoing availability and supply chain continuity. The D3426 is obsolete, making the TX2-12V the appropriate choice for new procurements and system repairs.

Compliance and Certifications: The TX2-12V carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic components in most jurisdictions. Both parts share identical ECCN and HTSUS classifications.

Performance Characteristics: The TX2-12V demonstrates improved performance in switching speed (4 ms operate/release time versus 5 ms) and reduced coil current draw (11.7 mA versus 16.7 mA), resulting in lower power consumption. The fully sealed design of the TX2-12V provides enhanced environmental protection compared to the unspecified seal rating of the D3426.

Operating Temperature Consideration: The TX2-12V operates across -40°C to 85°C, which is narrower than the D3426 range of -55°C to 85°C. Applications requiring operation below -40°C must retain the D3426 or identify alternative substitutes with extended low-temperature ratings.

Frequently Asked Questions (FAQ)

Q: Can the TX2-12V replace the D3426 in existing circuit designs?

A: Yes. The TX2-12V is a direct functional substitute for the D3426. Both relays share identical coil voltage (12VDC), contact form (DPDT), contact rating (2A), mounting type (through hole), and termination style (PC pin). Electrical performance and switching characteristics are equivalent. No circuit modifications are required.

Q: What are the key differences between the D3426 and TX2-12V?

A: The primary differences are: (1) Product status—D3426 is obsolete while TX2-12V is active; (2) Operating temperature range—D3426 operates to -55°C while TX2-12V operates to -40°C; (3) Coil current—TX2-12V draws 11.7 mA versus 16.7 mA for D3426; (4) Switching speed—TX2-12V operates and releases in 4 ms versus 5 ms; (5) Seal rating—TX2-12V is fully sealed; (6) Contact material composition differs but maintains equivalent electrical performance.

Q: Are there packaging differences between these relays?

A: The D3426 packaging is specified as "-" (not detailed), while the TX2-12V is supplied in tube packaging. Both are through-hole mounted components with PC pin termination. Verify physical dimensions and pin spacing compatibility with your PCB layout before procurement.

Q: Does the TX2-12V meet current regulatory requirements?

A: Yes. The TX2-12V is RoHS3 compliant and REACH unaffected, meeting current environmental and chemical regulations. Both parts share the same ECCN (EAR99) and HTSUS (8536.41.0020) classifications for export and tariff purposes.

Q: What applications require the D3426 over the TX2-12V?

A: Applications requiring operation below -40°C must use the D3426 or identify alternative substitutes with extended low-temperature ratings. The D3426 operates to -55°C while the TX2-12V minimum is -40°C. All other applications can use the TX2-12V.

Q: Is the higher coil resistance of the TX2-12V (1.03 kOhms vs. 720 Ohms) a concern?

A: No. Both relays operate at identical 12VDC coil voltage and share the same must-operate (9VDC) and must-release (1.2VDC) thresholds. The higher coil resistance of the TX2-12V results in lower coil current draw (11.7 mA vs. 16.7 mA), which is advantageous for power efficiency. Coil resistance variation is acceptable provided voltage thresholds remain equivalent.

Q: Can the TX2-12V handle the same switching voltages as the D3426?

A: The TX2-12V is rated for 220VDC maximum switching voltage, while the D3426 is rated for 250VAC and 220VDC maximum. For applications requiring 250VAC switching capability, the D3426 specifications must be retained. For 220VDC or lower applications, the TX2-12V is fully compatible.