HC4ED-HTM-AC12V Equivalent & Substitute Parts

Part Overview

The HC4ED-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 socketable relay is designed for applications requiring four independent switching circuits with a 1A contact rating at 250VAC maximum switching voltage. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications where continued functionality is required.

Substiute Parts

HC4ED-HTM-AC12V

Panasonic Electric WorksIn Stock: 771HC4ED-HTM-AC12V Datasheet

Current PartRFQ

LY4F-AC12

Omron Automation and SafetyIn Stock: 1137LY4F-AC12 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HC4ED-HTM-AC12V is determined by strict alignment of the following critical parameters:

Essential Matching Criteria:

• Coil voltage: 12VAC (exact match required)
• Contact form: 4PDT (4 Form C) configuration (exact match required)
• Coil type: Non Latching (exact match required)
• Termination style: Plug In (exact match required)

Allowable Parameter Variations:

• Contact rating (current): The substitute may exceed the original 1A rating, provided the application does not require the lower rating as a design constraint
• Switching voltage: The substitute must meet or exceed 250VAC maximum switching voltage
• Mounting type: Socketable to Chassis Mount conversion is permissible with appropriate mechanical adaptation
• Operating temperature range: The substitute may have a narrower range if it encompasses the application's operating conditions
• Operate/Release time: Variations within millisecond ranges are acceptable for general purpose applications
• Contact material: Silver Alloy substitutes are acceptable for applications previously using Silver Nickel/Gold contacts

The LY4F-AC12 from Omron Automation and Safety meets all essential matching criteria and is classified as an acceptable substitute.

Parameter Comparison

Engineering Selection Recommendations

The LY4F-AC12 is an active product from Omron Automation and Safety and serves as the designated substitute for the obsolete HC4ED-HTM-AC12V. Selection of this substitute is supported by the following factors:

Product Status: The LY4F-AC12 maintains active product status with confirmed inventory availability (1094 units), ensuring long-term supply chain viability compared to the obsolete HC4ED-HTM-AC12V.

Compliance and Certifications: The LY4F-AC12 is RoHS Compliant, meeting current regulatory requirements for electronic components. Both parts share identical ECCN (EAR99) and HTSUS classifications, confirming regulatory equivalence.

Functional Compatibility: The LY4F-AC12 provides enhanced contact rating (10A versus 1A) and extended switching voltage capability (250VAC and 125VDC), making it suitable for applications originally designed for the HC4ED-HTM-AC12V without performance degradation.

Mechanical Adaptation: The transition from socketable to chassis mount configuration requires mechanical redesign of the mounting interface. This substitution is appropriate for new designs or retrofit applications where mounting structure can be modified.

Frequently Asked Questions (FAQ)

Q: Can the LY4F-AC12 directly replace the HC4ED-HTM-AC12V in existing equipment?

A: Direct replacement requires mechanical adaptation. The HC4ED-HTM-AC12V uses socketable mounting, while the LY4F-AC12 requires chassis mount installation. Electrical compatibility is confirmed; mechanical mounting structure must be redesigned.

Q: What is the significance of the higher contact rating (10A vs. 1A) on the LY4F-AC12?

A: The LY4F-AC12 contact rating of 10A exceeds the original 1A specification. This provides design margin for applications originally rated at 1A. Applications requiring the lower 1A rating as a design constraint should verify that the higher rating does not introduce unintended circuit behavior.

Q: Are the coil voltage specifications identical between these parts?

A: Yes. Both the HC4ED-HTM-AC12V and LY4F-AC12 operate on 12VAC coil voltage with identical must-operate (9.6VAC) and must-release (3.6VAC) thresholds, confirming direct electrical compatibility for coil circuits.

Q: What is the impact of the 5ms difference in operate and release times?

A: The LY4F-AC12 operates and releases 5ms slower than the HC4ED-HTM-AC12V (25ms versus 20ms). For general purpose relay applications, this difference is typically insignificant. Applications with timing-critical switching requirements should verify that the extended response time is acceptable.

Q: Does the narrower operating temperature range of the LY4F-AC12 affect substitution suitability?

A: The LY4F-AC12 operates from -25°C to 40°C, compared to the HC4ED-HTM-AC12V range of -40°C to 60°C. Substitution is appropriate only for applications operating within the -25°C to 40°C envelope. Applications requiring operation below -25°C or above 40°C require alternative substitutes.

Q: What is the difference in coil current between these relays?

A: The LY4F-AC12 draws 170mA coil current compared to 100mA for the HC4ED-HTM-AC12V. Control circuits must provide adequate current capacity for the higher coil current requirement. Verify that existing power supplies and control circuitry can supply the additional 70mA without voltage regulation issues.

Q: Are the contact materials compatible for the same applications?

A: The HC4ED-HTM-AC12V uses Silver Nickel (AgNi) and Gold (Au) contacts, while the LY4F-AC12 uses Silver Alloy contacts. Both materials are suitable for general purpose switching applications. Applications with specific contact material requirements should verify compatibility with Silver Alloy contacts.