D3246 Telecom Relay DPDT 2A 12V Equivalent & Substitute Parts

Part Overview

The D3246 is a telecom-grade DPDT (Double Pole Double Throw) relay manufactured by TE Connectivity Potter & Brumfield Relays, designed for through-hole mounting applications requiring 12VDC coil operation and 2A contact switching capacity. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design implementations. The relay features latching single-coil operation with palladium, ruthenium, and gold contact materials, suitable for switching applications up to 250VAC and 220VDC maximum.

Substiute Parts

D3246

TE Connectivity Potter & Brumfield RelaysIn Stock: 1003D3246 Datasheet

Current PartRFQ

TXD2-L-12V

Panasonic Electric WorksIn Stock: 964TXD2-L-12V Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the D3246 is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 12VDC
• Contact Form: DPDT (2 Form C)
• Contact Rating (Current): 2 A
• Mounting Type: Through Hole
• Coil Type: Latching, Single Coil
• Termination Style: PC Pin
• Operating Temperature Range: -40°C ~ 85°C
• Must Operate Voltage: 9 VDC

Allowable Variations:

• Switching Voltage: Substitute must support minimum 220VDC (D3246 supports 250VAC, 220VDC maximum)
• Coil Current: Substitute may differ within circuit design constraints
• Coil Resistance: Substitute may differ based on coil current specifications
• Contact Material: Substitute may use alternative precious metal compositions
• Operate/Release Time: Substitute may vary within millisecond tolerances
• Seal Rating: Substitute may include enhanced sealing
• Product Status: Active status preferred for long-term availability

The TXD2-L-12V from Panasonic Electric Works meets all mandatory parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The TXD2-L-12V from Panasonic Electric Works is a qualified substitute for the obsolete D3246 relay. Selection rationale is based on the following factors:

Product Status and Availability: The D3246 is classified as obsolete, creating supply chain risk for maintenance and new production. The TXD2-L-12V maintains active product status with documented inventory availability, ensuring long-term procurement viability.

Functional Equivalence: All mandatory electrical and mechanical parameters align between the two components. The DPDT contact configuration, 12VDC coil operation, 2A switching capacity, through-hole mounting, and latching single-coil design are identical. Operating temperature range, must-operate voltage, and operate time specifications match exactly.

Compliance and Certifications: The TXD2-L-12V provides enhanced compliance documentation, including ROHS3 compliance and REACH unaffected status. Both components share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications, confirming regulatory equivalence.

Minor Parameter Variations: The TXD2-L-12V exhibits a 1 millisecond increase in release time (4 ms versus 3 ms) and higher coil current (12.5 mA versus 8.3 mA). These variations are within acceptable engineering tolerances for general-purpose and telecom relay applications and do not compromise functional compatibility in standard switching circuits.

Physical and Environmental Advantages: The TXD2-L-12V includes fully sealed construction, providing enhanced environmental protection compared to the D3246. Both components maintain identical moisture sensitivity level (MSL 1) and operating temperature range specifications.

Frequently Asked Questions (FAQ)

Q: Can the TXD2-L-12V directly replace the D3246 in existing circuit designs?

A: Yes. The TXD2-L-12V meets all mandatory electrical and mechanical parameters required for D3246 substitution. Identical coil voltage, contact configuration, current rating, mounting type, and operating temperature range ensure functional compatibility. The component can be substituted without circuit redesign.

Q: What is the significance of the coil current difference (8.3 mA versus 12.5 mA)?

A: The higher coil current in the TXD2-L-12V reflects a lower coil resistance (960 Ohms versus 1.44 kOhms). This difference is proportional and expected across relay designs from different manufacturers. Circuit designs must accommodate the higher current draw, but this does not prevent substitution in standard applications with adequate power supply capacity.

Q: Does the 1 millisecond difference in release time affect system performance?

A: The TXD2-L-12V release time of 4 ms versus the D3246 release time of 3 ms represents a 1 millisecond variance. This difference is negligible in most telecom and general-purpose switching applications. Applications requiring sub-millisecond timing precision must evaluate this parameter against specific system requirements.

Q: What are the packaging differences between these components?

A: The D3246 is specified with standard through-hole packaging. The TXD2-L-12V is supplied in tube packaging. Both components use identical PC pin termination and through-hole mounting configuration, ensuring mechanical compatibility on printed circuit boards.

Q: Why does the TXD2-L-12V have a lower maximum switching voltage specification?

A: The D3246 supports 250VAC and 220VDC maximum switching voltage, while the TXD2-L-12V supports 220VDC maximum. The 220VDC specification is common to both components and sufficient for standard telecom and industrial switching applications. Applications requiring 250VAC switching capability must evaluate this parameter against specific load requirements.

Q: Are there compliance advantages to selecting the TXD2-L-12V?

A: Yes. The TXD2-L-12V provides documented ROHS3 compliance and REACH unaffected status, supporting modern regulatory requirements. Both components share identical ECCN and HTSUS classifications. The TXD2-L-12V also includes fully sealed construction, providing enhanced environmental protection.

Q: Is the TXD2-L-12V suitable for new design implementations?

A: Yes. The TXD2-L-12V maintains active product status with established manufacturer support and documented availability. The component is appropriate for both replacement applications and new circuit designs requiring 12VDC DPDT relay functionality.