PCF-124D2M,000 Equivalent & Substitute Parts

Part Overview

The PCF-124D2M,000 is a general purpose relay manufactured by TE Connectivity Potter & Brumfield Relays, configured as a Single Pole Single Throw Normally Open (SPST-NO) relay with a 24VDC coil. This through-hole mounted relay is rated for 25A continuous contact current and supports switching voltages up to 277VAC and 24VDC. The product is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across coil voltage, contact form, mounting type, and electrical ratings within specified tolerances.

Substiute Parts

PCF-124D2M,000

TE Connectivity Potter & Brumfield RelaysIn Stock: 3128PCF-124D2M,000 Datasheet

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ALF1T24

Panasonic Electric WorksIn Stock: 10271ALF1T24 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF-124D2M,000 is determined by strict alignment of electrical and mechanical parameters. The following criteria establish substitution validity:

Critical Parameters (Must Match Exactly):

• Coil voltage must be 24VDC
• Contact form must be SPST-NO (1 Form A)
• Mounting type must be through-hole
• Termination style must be PC Pin, Quick Connect - 0.250" (6.3mm)

Important Parameters (Must Be Within Specified Tolerances):

• Contact current rating must support minimum 25A continuous operation
• Coil current must be 37.5 mA
• Coil resistance must be 640 Ohms
• Switching voltage capability must support 277VAC and 24VDC
• Operating temperature range must encompass -30°C to 55°C
• Contact material must be Silver Tin Oxide (AgSnO)
• Operate and release times must be compatible with 20 ms and 10 ms respectively
• RoHS3 compliance is required

The ALF1T24 substitute part meets the critical parameters and maintains compatibility across coil specifications and termination style. However, the contact current rating of 20A is below the 25A requirement of the main part, and the maximum switching voltage is 250VAC (below the 277VAC specification). These differences require engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ALF1T24 manufactured by Panasonic Electric Works is an active product suitable for applications requiring replacement of the obsolete PCF-124D2M,000. Both parts maintain identical coil specifications (24VDC, 37.5 mA, 640 Ohms), contact form (SPST-NO), mounting configuration (through-hole), and termination style (PC Pin, Quick Connect - 0.250").

Compliance and Regulatory Status: Both the PCF-124D2M,000 and ALF1T24 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Application Considerations: The ALF1T24 operates within a wider temperature range (-40°C to 60°C versus -30°C to 55°C), providing enhanced performance in extreme temperature environments. The substitute part demonstrates lower must-operate voltage (16.8VDC versus 18VDC) and lower must-release voltage (2.4VDC versus 1.2VDC), indicating slightly different operational characteristics in marginal voltage conditions.

Electrical Rating Differences: The ALF1T24 contact current rating of 20A is 5A below the PCF-124D2M,000 specification of 25A. Applications operating at or near 25A continuous current require confirmation that 20A rating is acceptable. The maximum switching voltage of the ALF1T24 is 250VAC, compared to 277VAC for the main part. Applications requiring 277VAC switching capability must be evaluated against the substitute's 250VAC maximum.

Timing Characteristics: Release time for the ALF1T24 is 15 ms, compared to 10 ms for the PCF-124D2M,000. Applications with strict release time requirements must confirm compatibility with the 5 ms difference.

Frequently Asked Questions (FAQ)

Q: Can the ALF1T24 directly replace the PCF-124D2M,000 in all applications?

A: The ALF1T24 is mechanically and electrically compatible for coil voltage, contact form, mounting type, and termination style. However, applications operating at 25A continuous current or requiring 277VAC switching capability must evaluate whether the ALF1T24 ratings of 20A and 250VAC maximum are acceptable. Release time difference of 5 ms must be confirmed for timing-critical applications.

Q: What are the key differences between these two relays?

A: The primary differences are contact current rating (25A versus 20A), maximum switching voltage (277VAC versus 250VAC), release time (10 ms versus 15 ms), and operating temperature range (-30°C to 55°C versus -40°C to 60°C). Coil specifications, contact form, mounting type, and termination style are identical.

Q: Are both relays RoHS compliant?

A: Yes, both the PCF-124D2M,000 and ALF1T24 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the moisture sensitivity level for these relays?

A: Both relays carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints. Standard handling and storage practices are sufficient without special moisture control measures.

Q: Can I use the ALF1T24 in a 277VAC application?

A: The ALF1T24 is rated for maximum 250VAC switching voltage. Applications requiring 277VAC switching capability cannot use this substitute without exceeding the component's electrical rating.

Q: Are the termination styles compatible?

A: Yes, both relays use identical termination: PC Pin, Quick Connect - 0.250" (6.3mm). PCB layouts and connector interfaces designed for the PCF-124D2M,000 are compatible with the ALF1T24.

Q: What is the coil current requirement for both relays?

A: Both relays require 37.5 mA coil current at 24VDC with 640 Ohms coil resistance. Power supply and control circuit designs are identical for both parts.

Q: How do the operating voltage ranges differ?

A: The PCF-124D2M,000 must operate at 18VDC minimum and release at 1.2VDC maximum. The ALF1T24 must operate at 16.8VDC minimum and release at 2.4VDC maximum. The ALF1T24 operates at lower voltages, which may be advantageous in low-voltage applications but requires confirmation in marginal voltage conditions.