D3403 Telecom Relay DPDT 2A 5V Equivalent & Substitute Parts

Part Overview

The D3403 is a telecom-grade double-pole double-throw (DPDT) relay manufactured by TE Connectivity Potter & Brumfield Relays, designed for 5VDC coil operation with 2A contact rating. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The D3403 operates across a wide temperature range of -55°C to 85°C and features through-hole PC pin termination suitable for printed circuit board assembly.

The obsolete status of the D3403 requires engineers to identify functionally compatible alternatives from active product lines. Substitute parts must maintain electrical compatibility across critical parameters including coil voltage, contact form, contact rating, and switching voltage specifications to ensure direct replacement capability in existing circuit designs.

Substiute Parts

D3403

TE Connectivity Potter & Brumfield RelaysIn Stock: 843D3403 Datasheet

Current PartRFQ

TX2-5V

Panasonic Electric WorksIn Stock: 30149TX2-5V Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the D3403 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 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

Compatible Operating Parameters:

• Must Operate Voltage: 3.75 VDC minimum
• Must Release Voltage: 0.5 VDC maximum
• Switching Voltage: 220VDC or greater

The TX2-5V from Panasonic Electric Works meets all mandatory matching parameters and maintains compatibility across operating voltage thresholds and switching voltage specifications. This part is classified as active, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The TX2-5V from Panasonic Electric Works is the direct equivalent substitute for the obsolete D3403. This selection is based on the following engineering criteria:

Product Status Alignment: The TX2-5V is classified as active, providing assured long-term availability and supply chain stability compared to the obsolete D3403.

Electrical Equivalence: All mandatory electrical parameters match exactly, including 5VDC coil voltage, DPDT contact form, 2A contact rating, and non-latching coil type. Operating voltage thresholds (3.75VDC must operate, 0.5VDC must release) are identical.

Mechanical Compatibility: Both parts feature through-hole mounting with PC pin termination, enabling direct board-level replacement without circuit redesign.

Regulatory Compliance: The TX2-5V maintains ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. Both parts carry EAR99 ECCN classification.

Performance Characteristics: The TX2-5V demonstrates faster switching times (4 ms operate and release versus 5 ms), representing an operational improvement. The operating temperature range of -40°C to 85°C covers the majority of industrial applications, with the D3403 lower limit of -55°C applicable only to specialized extreme-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the TX2-5V directly replace the D3403 in existing circuit boards?

A: Yes. The TX2-5V provides direct replacement capability. Both parts share identical coil voltage (5VDC), contact form (DPDT), contact rating (2A), mounting type (through-hole), and termination style (PC pin). Pin-for-pin compatibility is maintained.

Q: What is the difference in coil current between these parts?

A: The D3403 draws 60 mA coil current, while the TX2-5V draws 28.1 mA. The lower current requirement of the TX2-5V reduces power consumption and heat generation in the coil circuit. Circuit designs must accommodate this difference in current draw during coil energization.

Q: Are there temperature range limitations with the TX2-5V?

A: The TX2-5V operates from -40°C to 85°C, compared to the D3403 range of -55°C to 85°C. Applications requiring operation below -40°C require evaluation of the lower temperature limit. Most commercial and industrial applications operate within the TX2-5V temperature specification.

Q: What is the difference in coil resistance?

A: The D3403 has 83.3 Ohms coil resistance, while the TX2-5V has 178 Ohms. This difference reflects different coil winding designs. Both parts operate at 5VDC with specified must-operate and must-release voltages. Circuit designs using current-limiting resistors or voltage regulation must account for the coil resistance difference.

Q: Does the TX2-5V meet RoHS requirements?

A: Yes. The TX2-5V is ROHS3 compliant and REACH unaffected, meeting current environmental regulations. The D3403 is RoHS compliant, representing an earlier compliance standard.

Q: What is the packaging difference?

A: The D3403 is supplied in standard packaging, while the TX2-5V is supplied in tube packaging. Tube packaging is standard for active production parts and does not affect component functionality or board-level performance.

Q: Are the switching voltage specifications compatible?

A: Yes. The D3403 switches up to 250VAC and 220VDC maximum. The TX2-5V switches up to 220VDC maximum. For applications requiring 250VAC switching, the D3403 specification is higher. For 220VDC and lower applications, both parts are equivalent.

Q: What is the seal rating difference?

A: The D3403 seal rating is not specified in the documentation. The TX2-5V is rated as sealed fully, providing enhanced protection against moisture and environmental contamination. This represents an improvement in environmental protection for the substitute part.