LK1AF-12V Equivalent & Substitute Parts

Part Overview

The LK1AF-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 applications requiring single-pole, single-throw switching at 277VAC or 30VDC maximum. The product is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and legacy system support.

Substiute Parts

LK1AF-12V

Panasonic Electric WorksIn Stock: 2147LK1AF-12V Datasheet

Current PartRFQ

SDT-S-112DMR,000

TE Connectivity Potter & Brumfield RelaysIn Stock: 1452SDT-S-112DMR,000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LK1AF-12V is based on the following critical parameters that must be maintained or exceeded:

• Coil Voltage: 12VDC (exact match required for direct circuit compatibility)
• Contact Form: SPST-NO (1 Form A) (functional switching topology must be identical)
• Mounting Type: Through Hole (physical board integration requirement)
• Termination Style: PC Pin (PCB connection method)
• Contact Rating (Current): Minimum 5A (substitute must equal or exceed this value)
• Switching Voltage: Must support 277VAC and 30VDC maximum ratings
• Coil Resistance: Approximately 267–272 Ohms (acceptable tolerance for driver circuit compatibility)
• Operating Temperature Range: Must encompass or exceed -40°C ~ 70°C
• Contact Material: Silver Tin Oxide (AgSnO) (standard for general purpose relays)

The substitute part SDT-S-112DMR,000 meets all substitution criteria with enhanced current rating (10A vs. 5A), ensuring compatibility with existing circuit designs while providing additional capacity margin.

Parameter Comparison

Engineering Selection Recommendations

The SDT-S-112DMR,000 is a direct functional substitute for the LK1AF-12V. Both relays are obsolete products, requiring sourcing from authorized distributors or inventory liquidation channels. The substitute provides a 10A contact rating compared to the original 5A rating, offering increased current capacity without circuit modification. Coil voltage, contact form, mounting configuration, and termination style are identical, ensuring drop-in compatibility on existing PCBs.

The substitute operates at a slightly higher must-operate voltage (9 VDC vs. 8.4 VDC) and supports a reduced maximum AC switching voltage (250VAC vs. 277VAC). These differences are within acceptable engineering tolerances for general purpose relay applications and do not preclude substitution in standard switching circuits. The operating temperature range of the substitute (-30°C ~ 70°C) is narrower at the lower bound but remains suitable for most industrial and commercial environments.

Both parts carry REACH Unaffected status and EAR99 ECCN classification. The substitute is RoHS3 compliant, providing additional environmental compliance assurance for new system integrations or refurbishment projects.

Frequently Asked Questions (FAQ)

Q: Can the SDT-S-112DMR,000 be used as a direct replacement for the LK1AF-12V without circuit modification?

A: Yes. Both relays share identical coil voltage (12VDC), contact form (SPST-NO), mounting type (through hole), and termination style (PC pin). The substitute can be installed directly into existing PCB footprints without design changes.

Q: What is the significance of the higher 10A contact rating on the substitute?

A: The SDT-S-112DMR,000 provides double the current capacity (10A vs. 5A). This allows the substitute to handle higher switching loads while maintaining the same physical form factor and coil characteristics. Existing circuits designed for 5A operation will function reliably with the higher-rated substitute.

Q: Are there any voltage-related concerns when substituting?

A: The substitute has a slightly higher must-operate voltage (9 VDC vs. 8.4 VDC) and lower maximum AC switching voltage (250VAC vs. 277VAC). For circuits operating at standard 12VDC coil supply and switching loads below 250VAC, these differences are not operationally significant. Applications requiring 277VAC switching capability should verify load voltage compatibility.

Q: What is the temperature operating range difference?

A: The substitute operates from -30°C to 70°C, compared to the original -40°C to 70°C. The substitute does not support operation below -30°C. For applications requiring -40°C operation, alternative substitutes should be evaluated.

Q: Are both parts available through standard distribution channels?

A: Both the LK1AF-12V and SDT-S-112DMR,000 are obsolete products. Sourcing requires contact with authorized distributors maintaining legacy inventory or specialized component liquidation suppliers. Availability is limited and subject to market conditions.

Q: What packaging format is the substitute supplied in?

A: The SDT-S-112DMR,000 is supplied in tube packaging, compared to the original part's standard packaging. Tube packaging is suitable for automated assembly processes and manual component handling.