LKT1AF-12V Equivalent & Substitute Parts

Part Overview

The LKT1AF-12V is a general purpose relay manufactured by Panasonic Electric Works, configured as a SPST-NO (1 Form A) with a 12VDC coil and 5A contact rating. This through-hole mounted relay is designed for general switching applications with sealed flux protection and silver tin oxide contacts. The product is currently obsolete, making identification of suitable substitute components necessary for ongoing maintenance, repair, and new design implementations where equivalent functionality is required.

Substiute Parts

LKT1AF-12V

Panasonic Electric WorksIn Stock: 5684LKT1AF-12V Datasheet

Current PartRFQ

ALZN5B12W

Panasonic Electric WorksIn Stock: 1246ALZN5B12W Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LKT1AF-12V is determined by strict equivalence in the following critical parameters:

• Coil Voltage: Must be 12VDC to ensure direct compatibility with existing circuit designs
• Contact Form: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Mounting Type: Must be Through Hole to ensure PCB footprint compatibility
• Termination Style: Must be PC Pin for direct connection to printed circuit boards
• Coil Type: Must be Non Latching for identical operational behavior
• Seal Rating: Must be Sealed - Flux Protection for equivalent environmental protection
• Contact Material: Must be Silver Tin Oxide (AgSnO) for consistent electrical performance

The ALZN5B12W meets all these critical parameters. While it offers higher contact rating (16A versus 5A) and extended temperature range (-40°C ~ 85°C versus -40°C ~ 70°C), these represent improvements that do not compromise compatibility. The higher current rating provides additional design margin without affecting applications designed for 5A operation.

Parameter Comparison

Engineering Selection Recommendations

The ALZN5B12W is a direct functional substitute for the LKT1AF-12V. Both relays are manufactured by Panasonic Electric Works and share identical coil voltage, contact form, mounting configuration, and switching characteristics. The ALZN5B12W is currently in active production status, ensuring long-term availability and supply chain continuity.

The ALZN5B12W provides enhanced specifications in contact rating (16A versus 5A) and operating temperature range (-40°C ~ 85°C versus -40°C ~ 70°C), representing design improvements that maintain full backward compatibility. The higher contact rating accommodates applications with greater current demands without affecting circuits designed for 5A operation.

Both components maintain equivalent environmental protection through sealed flux protection and identical moisture sensitivity classification. Compliance certifications differ only in RoHS revision level (ROHS3 for ALZN5B12W versus RoHS for LKT1AF-12V), with ROHS3 representing current regulatory compliance. The ALZN5B12W includes additional approval agencies (cURus, VDE) and REACH compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the ALZN5B12W directly replace the LKT1AF-12V in existing circuit designs?

A: Yes. Both relays share identical coil voltage (12VDC), contact form (SPST-NO), mounting type (Through Hole), and termination style (PC Pin). The ALZN5B12W operates with the same switching characteristics and timing parameters, ensuring functional equivalence in all applications designed for the LKT1AF-12V.

Q: What is the significance of the higher contact rating on the ALZN5B12W?

A: The ALZN5B12W is rated for 16A continuous current versus 5A for the LKT1AF-12V. This higher rating provides additional design margin and allows the substitute to handle applications with greater current demands. Circuits designed for 5A operation remain fully compatible and experience no adverse effects from the higher rating.

Q: Are there packaging differences between these relays?

A: The LKT1AF-12V is supplied in standard packaging, while the ALZN5B12W is supplied in Tray packaging. Both maintain identical through-hole PC pin termination and footprint compatibility. Tray packaging is standard for active production components and does not affect electrical or mechanical compatibility.

Q: Why does the ALZN5B12W have a lower coil resistance?

A: The ALZN5B12W has 360 Ohms coil resistance compared to 576 Ohms for the LKT1AF-12V, resulting in higher coil current (33.3 mA versus 20.8 mA). This difference reflects design optimization in the newer component but does not affect compatibility with 12VDC coil supply circuits. The identical must-operate and must-release voltages ensure equivalent switching behavior.

Q: What is the difference in operating temperature ranges?

A: The LKT1AF-12V operates from -40°C to 70°C, while the ALZN5B12W extends to -40°C to 85°C. The ALZN5B12W provides a wider operating window, making it suitable for applications requiring higher temperature tolerance. Applications within the original -40°C to 70°C range experience no compatibility issues.

Q: Are both relays RoHS compliant?

A: Yes. The LKT1AF-12V is RoHS Compliant, and the ALZN5B12W is ROHS3 Compliant. ROHS3 represents the current revision of the RoHS directive and includes additional compliance documentation. Both components meet environmental and regulatory requirements for their respective production periods.

Q: What is the product status difference, and why does it matter?

A: The LKT1AF-12V is obsolete, meaning it is no longer in production. The ALZN5B12W is active, ensuring continued availability, technical support, and supply chain reliability. For new designs and ongoing maintenance, the ALZN5B12W provides long-term component availability.