D3247 Telecom Relay DPDT 2A 24V Equivalent & Substitute Parts

Part Overview

The D3247 is a telecom-grade DPDT relay manufactured by TE Connectivity Potter & Brumfield Relays, designed for 24VDC coil operation with 2A contact rating. This component features a latching, single-coil configuration with through-hole PC pin termination and operates across the industrial temperature range of -40°C to 85°C. The D3247 is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design implementations. Substitute parts must maintain electrical compatibility across coil voltage, contact form, current rating, and switching voltage parameters while accommodating modern product availability and compliance requirements.

Substiute Parts

D3247

TE Connectivity Potter & Brumfield RelaysIn Stock: 1186D3247 Datasheet

Current PartRFQ

TXD2-L-24V

Panasonic Electric WorksIn Stock: 1155TXD2-L-24V Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the D3247 are identified based on strict electrical and mechanical parameter alignment. The following parameters establish substitution eligibility:

Critical Matching Parameters:

• Coil voltage must be 24VDC
• Contact form must be DPDT (2 Form C)
• Contact rating must be 2 A minimum
• Switching voltage must support 220VDC minimum
• Mounting type must be through-hole
• Termination style must be PC pin
• Coil type must be latching, single-coil configuration

Secondary Compatibility Parameters:

• Operating temperature range must encompass -40°C to 85°C
• Must operate voltage must be 18 VDC or lower
• Operate and release times must be within acceptable switching performance windows

The TXD2-L-24V from Panasonic Electric Works meets all critical electrical parameters and maintains functional compatibility with the D3247 across coil voltage, contact configuration, current rating, and switching voltage specifications. The substitute part is classified as active product status with RoHS compliance, providing long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The TXD2-L-24V is the qualified substitute for the obsolete D3247 based on the following engineering criteria:

Electrical Compatibility: The substitute part maintains identical coil voltage (24VDC), contact form (DPDT), contact rating (2A), and core switching voltage specifications (220VDC minimum). Coil current and resistance variations (7.1 mA vs. 6.3 mA; 3.39 kOhms vs. 3.84 kOhms) remain within acceptable operating margins for 24VDC drive circuits.

Mechanical Compatibility: Both parts feature through-hole mounting with PC pin termination, enabling direct PCB footprint compatibility without layout modifications.

Operational Performance: Matching operate time (4 ms), must-operate voltage (18 VDC), and operating temperature range (-40°C to 85°C) ensure functional equivalence in telecom and industrial switching applications. Release time difference (4 ms vs. 3 ms) represents a 1 ms variance within acceptable switching performance tolerances.

Product Status and Compliance: The TXD2-L-24V is active product status with RoHS compliance certification, providing long-term supply chain availability and regulatory alignment for new designs and legacy system support. The substitute part includes sealed contact protection, offering enhanced environmental performance compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the TXD2-L-24V directly replace the D3247 in existing PCB designs?

A: Yes. Both parts feature identical through-hole mounting with PC pin termination, enabling direct footprint compatibility without PCB layout modifications. Electrical parameters across coil voltage, contact form, current rating, and switching voltage are matched.

Q: What is the significance of the 1 ms difference in release time (3 ms vs. 4 ms)?

A: The release time difference represents a 33% variance from the original specification. For applications requiring precise release timing below 4 ms, this parameter must be evaluated against system requirements. For general-purpose switching applications, this variance is operationally acceptable.

Q: How do the coil current and resistance differences affect circuit design?

A: The TXD2-L-24V draws 7.1 mA compared to the D3247's 6.3 mA, representing a 0.8 mA increase. Coil resistance is 3.39 kOhms versus 3.84 kOhms. These variations remain within standard 24VDC relay drive circuit tolerances and do not require circuit redesign for typical applications.

Q: What is the advantage of the sealed contact rating on the TXD2-L-24V?

A: The TXD2-L-24V features fully sealed contacts, providing enhanced protection against environmental contamination, moisture ingress, and oxidation compared to unsealed contact configurations. This enhancement improves long-term reliability in industrial and telecom environments.

Q: Is the TXD2-L-24V RoHS compliant?

A: Yes. The TXD2-L-24V is RoHS compliant, meeting current regulatory requirements for electronic component manufacturing and use in regulated markets.

Q: What packaging format is the TXD2-L-24V supplied in?

A: The TXD2-L-24V is supplied in tube packaging, suitable for automated assembly processes and component handling.

Q: Are there any applications where the D3247 cannot be substituted with the TXD2-L-24V?

A: Substitution is valid for all applications within the specified electrical and mechanical parameters. Applications requiring the original 250VAC switching voltage specification (versus the substitute's 220VDC maximum) must be evaluated for AC switching requirements. For DC-only switching applications, the 220VDC rating is sufficient.