ALD124 Equivalent & Substitute Parts

Part Overview

The ALD124 is a general purpose relay manufactured by Panasonic Electric Works, featuring SPST-NO (1 Form A) contact configuration with 24VDC coil voltage and 3A contact rating. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain electrical compatibility across coil voltage, contact form, contact rating, and operating parameters to ensure reliable circuit operation.

Substiute Parts

ALD124

Panasonic Electric WorksIn Stock: 1770ALD124 Datasheet

Current PartRFQ

ALDP124W

Panasonic Electric WorksIn Stock: 12217ALDP124W Datasheet

DirectRFQ

PCJ-124D3M,301

TE Connectivity Potter & Brumfield RelaysIn Stock: 6255PCJ-124D3M,301 Datasheet

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PCJ-124D3MH,301

TE Connectivity Potter & Brumfield RelaysIn Stock: 16367PCJ-124D3MH,301 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ALD124 are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Parameters (Must Match):

• Coil Voltage: 24VDC
• Contact Form: SPST-NO (1 Form A)
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Resistance: 2.88 kOhms
• Coil Current: 8.3 mA

Compatible Variation Parameters:

• Contact Rating (Current): 3A minimum (higher ratings acceptable for uprating applications)
• Switching Voltage: Must meet or exceed 277VAC, 30VDC
• Operating Temperature: Must encompass -40°C to 70°C minimum
• Contact Material: Silver Nickel (AgNi) preferred for consistency

The substitute parts identified maintain these critical parameters while offering variations in contact current rating, temperature range, and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

ALDP124W (Direct Manufacturer Upgrade)

The ALDP124W is the primary substitute for the ALD124. Both parts are manufactured by Panasonic Electric Works and share identical coil specifications (24VDC, 8.3 mA, 2.88 kOhms). The ALDP124W offers an increased contact rating of 5A compared to the ALD124's 3A, providing design margin for applications requiring higher switching capacity. The ALDP124W maintains active product status with RoHS3 compliance and extended operating temperature range (-40°C to 85°C). This part is recommended as the primary replacement for new designs and ongoing production.

PCJ-124D3MH,301 (Equivalent Contact Rating)

The PCJ-124D3MH,301 manufactured by TE Connectivity Potter & Brumfield Relays provides electrical equivalence with identical 3A contact rating and 24VDC coil specifications. This part maintains the same coil resistance and current draw as the ALD124. The PCJ-124D3MH,301 features fully sealed construction and RoHS3 compliance. Both the ALD124 and PCJ-124D3MH,301 are classified as obsolete; however, this part remains available in inventory (16,276 pcs) for legacy system support.

PCJ-124D3M,301 (Equivalent Contact Rating, Alternative Packaging)

The PCJ-124D3M,301 is functionally equivalent to the ALD124 with matching 3A contact rating and 24VDC coil voltage. This variant differs from PCJ-124D3MH,301 in seal rating (flux protection versus fully sealed) and packaging (bulk versus tray). Selection between PCJ-124D3M,301 and PCJ-124D3MH,301 depends on environmental protection requirements and procurement packaging preferences.

Frequently Asked Questions (FAQ)

Q: Can the ALDP124W replace the ALD124 in existing circuits?

A: Yes. The ALDP124W maintains identical coil voltage (24VDC), coil current (8.3 mA), coil resistance (2.88 kOhms), and contact form (SPST-NO). The increased contact rating (5A versus 3A) provides uprating capability without reducing circuit performance. The ALDP124W's extended operating temperature range (-40°C to 85°C) exceeds the ALD124's specification (-40°C to 70°C).

Q: What is the difference between PCJ-124D3M,301 and PCJ-124D3MH,301?

A: Both parts share identical electrical specifications (24VDC coil, 3A contact rating, 2.88 kOhms coil resistance). The primary differences are seal rating and packaging. PCJ-124D3MH,301 features fully sealed construction and tray packaging, while PCJ-124D3M,301 provides flux protection sealing and bulk packaging. Selection depends on environmental exposure and procurement requirements.

Q: Are all substitute parts RoHS compliant?

A: The ALDP124W carries RoHS3 compliance certification. The PCJ-124D3M,301 and PCJ-124D3MH,301 are both RoHS3 compliant. The original ALD124 does not specify RoHS status.

Q: What is the maximum switching voltage for each part?

A: The ALD124 and ALDP124W support 277VAC maximum switching voltage. The PCJ-124D3M,301 and PCJ-124D3MH,301 support 250VAC maximum switching voltage. For applications requiring 277VAC switching, the ALDP124W or ALD124 are required.

Q: Can these relays be used interchangeably in high-temperature applications?

A: The ALDP124W, PCJ-124D3M,301, and PCJ-124D3MH,301 all support -40°C to 85°C operating temperature, exceeding the ALD124's -40°C to 70°C range. For applications operating above 70°C, the substitute parts provide extended temperature capability.