D3021 Telecom Relay DPDT 2A 3V Equivalent & Substitute Parts

Part Overview

The D3021 is a telecom-grade double-pole double-throw (DPDT) relay manufactured by TE Connectivity Potter & Brumfield Relays, part of the FP2/AXICOM series. This through-hole mounted relay operates at 3VDC with a 2A contact rating and is designed for telecom switching applications. The D3021 is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain functional compatibility while meeting the electrical and mechanical requirements of the original application.

Substiute Parts

D3021

TE Connectivity Potter & Brumfield RelaysIn Stock: 1183D3021 Datasheet

Current PartRFQ

TQ2-3V

Panasonic Electric WorksIn Stock: 3319TQ2-3V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the D3021 must satisfy the following critical parameters to ensure functional compatibility:

Mandatory Matching Parameters:

• Coil Voltage: 3VDC
• Contact Form: DPDT (2 Form C)
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching
• Relay Type: Telecom

Allowable Parameter Variations: Substitute parts may differ in contact rating (current capacity), switching voltage, coil current, operate/release times, operating temperature range, and contact material composition, provided the application does not require the higher specifications of the original part. Substitutes must maintain RoHS compliance or equivalent environmental certification status.

The TQ2-3V from Panasonic Electric Works meets all mandatory matching parameters and qualifies as a functional substitute for the D3021, despite differences in contact rating and switching voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

D3021 (TE Connectivity Potter & Brumfield Relays)

The D3021 is classified as obsolete. This part is suitable only for replacement applications in existing systems where inventory is available. The D3021 offers a 2A contact rating and operates across a wider temperature range (-40°C to 85°C) and higher switching voltage (250VAC, 220VDC maximum). The part maintains RoHS compliance and carries EAR99 export classification.

TQ2-3V (Panasonic Electric Works)

The TQ2-3V is an active product from Panasonic Electric Works and serves as the primary substitute for the D3021. This part shares identical coil voltage (3VDC), contact form (DPDT), mounting type (through-hole), and termination style (PC pin). The TQ2-3V is ROHS3 compliant and carries the same EAR99 export classification as the original part.

Key Differences Requiring Application Assessment:

The TQ2-3V has a reduced contact rating of 1A compared to the D3021's 2A rating. Applications requiring switching currents exceeding 1A are not suitable for this substitute. The TQ2-3V operates at a maximum switching voltage of 125VAC/110VDC, lower than the D3021's 250VAC/220VDC specification. The TQ2-3V's operating temperature range extends to 70°C maximum, compared to the D3021's 85°C upper limit. The TQ2-3V exhibits faster operate time (3ms versus 4ms) and higher coil current draw (46.7mA versus 26.7mA).

For new designs or applications where the D3021 is no longer available, the TQ2-3V is suitable only when application requirements fall within its electrical and thermal specifications.

Frequently Asked Questions (FAQ)

Q: Can the TQ2-3V directly replace the D3021 in all applications?

A: No. The TQ2-3V has a lower contact rating (1A versus 2A) and reduced maximum switching voltage (125VAC/110VDC versus 250VAC/220VDC). Substitution is valid only when the application's switching current does not exceed 1A and switching voltage does not exceed 125VAC or 110VDC.

Q: What is the significance of the D3021 being classified as obsolete?

A: Obsolete status indicates the D3021 is no longer manufactured by TE Connectivity. Existing inventory may be available through authorized distributors, but long-term availability is not guaranteed. New designs should incorporate active substitute parts such as the TQ2-3V.

Q: Are there packaging differences between the D3021 and TQ2-3V?

A: The D3021 is supplied in standard packaging (not specified in detail), while the TQ2-3V is supplied in tube packaging. Both parts use identical PC pin termination and through-hole mounting, ensuring mechanical compatibility on printed circuit boards.

Q: How do the coil specifications differ between these relays?

A: The D3021 has a coil resistance of 113 Ohms and draws 26.7mA at 3VDC. The TQ2-3V has a coil resistance of 64.3 Ohms and draws 46.7mA at 3VDC. Both relays operate at 3VDC and are non-latching types. The higher coil current of the TQ2-3V requires verification that the driving circuit can supply the additional current.

Q: What are the operating temperature limitations for each relay?

A: The D3021 operates from -40°C to 85°C. The TQ2-3V operates from -40°C to 70°C. Applications requiring operation above 70°C are not suitable for the TQ2-3V substitute.

Q: Are both relays RoHS compliant?

A: Yes. The D3021 is RoHS compliant. The TQ2-3V is ROHS3 compliant. Both parts meet current environmental compliance requirements and carry EAR99 export classification.

Q: What contact materials are used in each relay?

A: The D3021 uses Palladium (Pd), Ruthenium (Ru), and Gold (Au) contact materials. The TQ2-3V uses Silver (Ag) and Gold (Au) contact materials. Both material compositions are suitable for telecom switching applications.

Q: How do the switching speeds compare?

A: The D3021 has an operate time of 4ms and release time of 3ms. The TQ2-3V has an operate time of 3ms and release time of 3ms. The TQ2-3V operates slightly faster during activation.