D3522W Equivalent & Substitute Parts

Part Overview

The D3522W is a telecom relay manufactured by TE Connectivity Potter & Brumfield Relays, configured as a DPDT (2 Form C) surface mount component with a 4.5VDC coil voltage and 2A contact rating. This part is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and procurement needs. The D3522W belongs to the FU2 and AXICOM series and is RoHS compliant with MSL 1 rating.

Key Parameters

Parameter	Value
Coil Voltage	4.5VDC
Contact Form	DPDT (2 Form C)
Contact Rating (Current)	2 A
Mounting Type	Surface Mount
Termination Style	Gull Wing
Coil Current	44.4 mA
Coil Resistance	101 Ohms
Must Operate Voltage	3.38 VDC
Must Release Voltage	0.45 VDC
Coil Type	Non Latching
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the D3522W is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Coil voltage: 4.5VDC
Contact form: DPDT (2 Form C)
Contact rating: 2 A minimum
Mounting type: Surface Mount
Termination style: Gull Wing
Coil current: 44.4 mA
Coil resistance: 101 Ohms
Must operate voltage: 3.38 VDC
Must release voltage: 0.45 VDC
Coil type: Non Latching
RoHS compliance: Required

The TXD2SL-4.5V from Panasonic Electric Works satisfies all mandatory parameters and qualifies as a direct substitute. This part maintains identical electrical characteristics for coil operation and contact switching while providing active product status and full sealing.

Parameter Comparison

Parameter	D3522W (TE Connectivity)	TXD2SL-4.5V (Panasonic)	Match Status
Coil Voltage	4.5VDC	4.5VDC	Identical
Contact Form	DPDT (2 Form C)	DPDT (2 Form C)	Identical
Contact Rating (Current)	2 A	2 A	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Termination Style	Gull Wing	Gull Wing	Identical
Coil Current	44.4 mA	44.4 mA	Identical
Coil Resistance	101 Ohms	101 Ohms	Identical
Must Operate Voltage	3.38 VDC	3.38 VDC	Identical
Must Release Voltage	0.45 VDC	0.45 VDC	Identical
Operate Time	5 ms	4 ms	Substitute Faster
Release Time	5 ms	4 ms	Substitute Faster
Operating Temperature Range	-55°C ~ 85°C	-40°C ~ 85°C	Substitute Narrower
Switching Voltage (Max)	250VAC, 220VDC	220VDC	Substitute Lower AC Rating
Coil Type	Non Latching	Non Latching	Identical
RoHS Status	RoHS Compliant	RoHS Compliant	Identical
Product Status	Obsolete	Active	Substitute Active
Seal Rating	Not specified	Sealed - Fully	Substitute Enhanced

Engineering Selection Recommendations

The TXD2SL-4.5V is a qualified substitute for the D3522W based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including coil voltage, contact form, contact rating, coil current, coil resistance, and voltage thresholds for operation and release.

Mechanical Compatibility: Both components share identical surface mount configuration with gull wing termination, ensuring PCB layout compatibility without redesign.

Compliance Status: The TXD2SL-4.5V maintains RoHS compliance and carries active product status from Panasonic Electric Works, providing long-term availability and supply chain stability compared to the obsolete D3522W.

Performance Characteristics: The TXD2SL-4.5V demonstrates improved switching performance with 4 ms operate and release times versus 5 ms for the D3522W. The substitute includes full sealing, enhancing environmental protection.

Design Considerations: The TXD2SL-4.5V operates across -40°C to 85°C, which covers standard industrial temperature ranges. Applications requiring the full -55°C lower temperature limit of the D3522W require evaluation of alternative solutions. The substitute's maximum switching voltage is 220VDC; applications requiring 250VAC switching capability require assessment of circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the TXD2SL-4.5V directly replace the D3522W without PCB modifications?

A: Yes. Both components are surface mount with gull wing termination and identical pin configurations for DPDT (2 Form C) contact form. No PCB layout changes are required for mechanical or electrical integration.

Q: What is the primary reason for substituting the D3522W?

A: The D3522W is classified as obsolete. The TXD2SL-4.5V from Panasonic Electric Works is an active product with equivalent electrical and mechanical specifications, ensuring continued availability and supply chain reliability.

Q: Are there differences in switching voltage ratings between these parts?

A: Yes. The D3522W supports 250VAC and 220VDC maximum switching voltage. The TXD2SL-4.5V supports 220VDC maximum. Applications switching 250VAC loads require verification that 220VDC rating is sufficient for the intended circuit.

Q: How do the operating temperature ranges compare?

A: The D3522W operates from -55°C to 85°C. The TXD2SL-4.5V operates from -40°C to 85°C. For applications requiring operation below -40°C, the D3522W specification must be retained or alternative components evaluated.

Q: What is the difference in switching speed between these relays?

A: The TXD2SL-4.5V operates and releases in 4 ms, compared to 5 ms for the D3522W. This 1 ms improvement in switching speed is within typical relay performance variation and does not affect standard circuit operation.

Q: Does the TXD2SL-4.5V provide any additional environmental protection?

A: Yes. The TXD2SL-4.5V includes full sealing, whereas the D3522W seal rating is not specified. Full sealing provides enhanced protection against moisture and contaminants in industrial environments.

Q: Are both parts RoHS compliant?

A: Yes. Both the D3522W and TXD2SL-4.5V are RoHS compliant, meeting regulatory requirements for lead-free and restricted substance compliance.

Q: What is the packaging difference between these parts?

A: The D3522W packaging is not specified in available documentation. The TXD2SL-4.5V is supplied in tube packaging. Confirm packaging requirements for your procurement and assembly processes.

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