D3043 Telecom Relay DPDT 5V Equivalent & Substitute Parts

Part Overview

The D3043 is a telecom-grade DPDT (Double Pole Double Throw) relay manufactured by TE Connectivity Potter & Brumfield Relays, operating at 5VDC with a 2A contact rating. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design support and procurement. The relay features latching, single-coil operation with PC pin termination and through-hole mounting, suitable for telecom switching applications requiring 250VAC or 220VDC maximum switching voltage.

Substiute Parts

D3043

TE Connectivity Potter & Brumfield RelaysIn Stock: 887D3043 Datasheet

Current PartRFQ

TQ2-L-5V

Panasonic Electric WorksIn Stock: 5412TQ2-L-5V Datasheet

SimilarRFQ

TQ2H-L-5V

Panasonic Electric WorksIn Stock: 1089TQ2H-L-5V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the D3043 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 5VDC
• Contact Form: DPDT (2 Form C)
• Coil Type: Latching, Single Coil
• Coil Current: 20 mA
• Coil Resistance: 250 Ohms
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Must Operate Voltage: 3.75 VDC

Allowable Variation Parameters:

• Contact Rating (Current): Substitute must equal or exceed 2A
• Switching Voltage: Substitute must equal or exceed 250VAC, 220VDC
• Operating Temperature Range: Substitute must cover or exceed -40°C ~ 85°C
• Operate/Release Time: Substitute timing must be compatible with application requirements
• RoHS and MSL Compliance: Substitute must maintain or exceed compliance level

The substitute parts TQ2-L-5V and TQ2H-L-5V from Panasonic Electric Works match all mandatory parameters. However, both substitutes have reduced contact current rating (1A versus 2A) and reduced maximum switching voltage (125VAC, 110VDC versus 250VAC, 220VDC), requiring application-level verification that these reduced ratings are acceptable for the intended circuit.

Parameter Comparison

Engineering Selection Recommendations

TQ2-L-5V and TQ2H-L-5V Substitution Criteria:

Both Panasonic Electric Works alternatives (TQ2-L-5V and TQ2H-L-5V) are active products with current manufacturing status, providing long-term supply continuity compared to the obsolete D3043. Both substitutes maintain identical coil specifications (5VDC, 20mA, 250 Ohms, latching single-coil operation) and identical mechanical form factor (through-hole PC pin termination).

Critical Derating Factors:

The substitute parts operate at reduced electrical ratings: contact current is reduced from 2A to 1A, and maximum switching voltage is reduced from 250VAC/220VDC to 125VAC/110VDC. These reductions require circuit-level analysis to confirm compatibility with application load requirements.

Temperature Range Consideration:

The substitute parts have a reduced upper operating temperature limit of 70°C compared to the D3043 specification of 85°C. Applications requiring operation above 70°C are not suitable for these substitutes.

Timing Characteristics:

The substitute parts exhibit significantly faster switching times (3ms operate/release versus 20ms for the D3043). Applications with timing-critical circuits must evaluate whether faster switching introduces functional changes.

Compliance Status:

Both substitute parts maintain MSL Level 1 (Unlimited) moisture sensitivity rating and RoHS compliance, meeting environmental and regulatory requirements equivalent to or exceeding the original part.

Contact Material Difference:

The D3043 uses Palladium/Ruthenium/Gold contact material, while substitutes use Silver/Gold. This material difference may affect contact resistance and switching characteristics in specific applications.

Frequently Asked Questions (FAQ)

Q: Can TQ2-L-5V or TQ2H-L-5V be used as direct replacements for D3043 in all applications?

A: Direct replacement is not universal. Both substitutes match the coil voltage, contact form, and mechanical mounting. However, the reduced contact current rating (1A versus 2A) and reduced maximum switching voltage (125VAC/110VDC versus 250VAC/220VDC) require verification that the application circuit operates within these lower limits. The reduced upper temperature limit (70°C versus 85°C) also excludes high-temperature applications.

Q: What is the difference between TQ2-L-5V and TQ2H-L-5V?

A: Both parts are functionally identical in electrical and mechanical specifications. The primary difference is the base product number designation (TQ2-L versus TQ2H). Both are manufactured by Panasonic Electric Works, operate at 5VDC with DPDT contact form, and have identical coil and switching characteristics. Selection between the two should be based on availability and packaging requirements.

Q: Are the faster switching times (3ms versus 20ms) of the substitute parts a concern?

A: Faster switching times can be beneficial for performance but may introduce functional changes in timing-sensitive circuits. Applications designed around the 20ms switching time of the D3043 should evaluate whether the 3ms switching time of the substitutes affects circuit behavior, signal sequencing, or system timing requirements.

Q: Do the substitute parts have the same contact material as the D3043?

A: No. The D3043 uses Palladium/Ruthenium/Gold contact material, while TQ2-L-5V and TQ2H-L-5V use Silver/Gold contact material. This difference may affect contact resistance, switching characteristics, and performance in specific load conditions. Applications sensitive to contact material properties should evaluate compatibility.

Q: What is the temperature operating range difference, and does it matter?

A: The D3043 operates from -40°C to 85°C, while both substitute parts operate from -40°C to 70°C. Applications requiring operation above 70°C cannot use these substitutes. Applications operating within -40°C to 70°C are fully compatible.

Q: Are both substitute parts RoHS compliant?

A: Yes. TQ2-L-5V is ROHS3 compliant, and TQ2H-L-5V is RoHS compliant. Both meet or exceed the environmental compliance requirements of the original D3043 part.

Q: What packaging is available for the substitute parts?

A: Both TQ2-L-5V and TQ2H-L-5V are supplied in tube packaging, which differs from the original D3043 packaging designation. Tube packaging is standard for high-volume component distribution and is compatible with automated assembly processes.

Q: Can I use these substitutes if my circuit requires 2A contact current?

A: No. The substitute parts are rated for 1A maximum contact current. Using them in circuits requiring 2A operation exceeds the component rating and creates reliability risk. Alternative parts with 2A or higher contact ratings must be identified for such applications.

Q: Are the coil specifications identical between the D3043 and substitutes?

A: Yes. All three parts have identical coil specifications: 5VDC coil voltage, 20mA coil current, 250 Ohms coil resistance, latching single-coil operation, and 3.75VDC must-operate voltage. Coil-level compatibility is confirmed.