HC4D-HTM-AC12V Equivalent & Substitute Parts

Part Overview

The HC4D-HTM-AC12V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 12VAC coil. This chassis mount relay is designed for switching applications up to 3A at 250VAC maximum. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and redesign applications where continued availability is required.

Substiute Parts

HC4D-HTM-AC12V

Panasonic Electric WorksIn Stock: 871HC4D-HTM-AC12V Datasheet

Current PartRFQ

LY4F-AC12

Omron Automation and SafetyIn Stock: 1137LY4F-AC12 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC4D-HTM-AC12V are identified based on the following critical parameters that must align for functional compatibility:

Primary Matching Criteria:

• Coil voltage: 12VAC
• Contact form: 4PDT (4 Form C)
• Coil type: Non Latching
• Must operate voltage: 9.6 VAC
• Must release voltage: 3.6 VAC
• Mounting type: Chassis Mount

Secondary Compatibility Factors:

• Contact rating current must be equal to or greater than 3A
• Switching voltage rating must support 250VAC operation
• Termination style must be compatible with existing circuit board or panel layouts

The LY4F-AC12 from Omron Automation and Safety meets all primary matching criteria and exceeds the contact current rating, making it a direct functional substitute for the obsolete HC4D-HTM-AC12V.

Parameter Comparison

Engineering Selection Recommendations

The LY4F-AC12 is a suitable substitute for the obsolete HC4D-HTM-AC12V based on the following engineering factors:

Functional Compatibility: Both relays share identical coil voltage (12VAC), contact form (4PDT), coil type (Non Latching), and critical voltage thresholds (9.6 VAC operate, 3.6 VAC release). The LY4F-AC12 provides higher contact current capacity (10A versus 3A), which is advantageous for applications requiring additional switching margin.

Product Status: The LY4F-AC12 is an active product from Omron Automation and Safety, ensuring ongoing availability and supply chain continuity compared to the obsolete HC4D-HTM-AC12V.

Compliance: The LY4F-AC12 is RoHS Compliant, meeting modern environmental and regulatory standards. Both parts carry EAR99 ECCN classification.

Operating Conditions: The HC4D-HTM-AC12V operates across a wider temperature range (-50°C to 70°C) compared to the LY4F-AC12 (-25°C to 40°C). Applications requiring operation below -25°C or above 40°C must account for this difference.

Timing Characteristics: The LY4F-AC12 exhibits slightly longer operate and release times (25 ms each) compared to the HC4D-HTM-AC12V (20 ms each). Applications with strict timing requirements should evaluate this 5 ms difference.

Frequently Asked Questions (FAQ)

Q: Can the LY4F-AC12 directly replace the HC4D-HTM-AC12V in existing applications?

A: The LY4F-AC12 is functionally compatible for applications operating within the overlapping temperature range (-25°C to 40°C) and timing tolerances. Physical mounting and termination compatibility must be verified for the specific installation, as both relays use chassis mount and plug-in termination but may have different footprints.

Q: What is the significance of the higher contact current rating on the LY4F-AC12?

A: The LY4F-AC12 provides 10A contact rating compared to 3A on the HC4D-HTM-AC12V. This higher rating provides additional switching capacity and safety margin for the same application, but does not change the fundamental switching characteristics or coil requirements.

Q: Are there temperature range limitations when substituting the LY4F-AC12?

A: Yes. The LY4F-AC12 operates from -25°C to 40°C, which is narrower than the HC4D-HTM-AC12V range of -50°C to 70°C. Applications requiring operation outside the -25°C to 40°C window cannot use the LY4F-AC12 as a substitute.

Q: How do the timing differences affect substitution?

A: The LY4F-AC12 has 5 ms longer operate and release times (25 ms versus 20 ms). Applications with timing-critical functions should evaluate whether this difference impacts system performance.

Q: What packaging considerations apply to this substitution?

A: The HC4D-HTM-AC12V uses 14-pin plug-in termination, while the LY4F-AC12 uses standard plug-in termination. Physical pin configuration and socket compatibility must be confirmed before installation.

Q: Is the LY4F-AC12 RoHS compliant?

A: Yes, the LY4F-AC12 is RoHS Compliant. The HC4D-HTM-AC12V RoHS status is not specified in the available documentation.