ALD118 Equivalent & Substitute Parts

Part Overview

The ALD118 is a general purpose relay manufactured by Panasonic Electric Works, featuring a SPST-NO (1 Form A) contact configuration with an 18VDC coil. This through-hole mounted relay is rated for 3A continuous contact current and supports switching loads up to 831VA at 277VAC or 90W at 30VDC. The ALD118 is classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

ALD118

Panasonic Electric WorksIn Stock: 2133ALD118 Datasheet

Current PartRFQ

ALDP118W

Panasonic Electric WorksIn Stock: 3000ALDP118W Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALD118 is determined by the following critical parameters that must remain constant or be exceeded:

• Coil Voltage: 18VDC (exact match required)
• Contact Form: SPST-NO (1 Form A) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Termination Style: PC Pin (exact match required)
• Coil Current: 11.1 mA (exact match required)
• Must Operate Voltage: 14.6 VDC minimum (exact match required)
• Must Release Voltage: 0.9 VDC maximum (exact match required)
• Operate/Release Time: 10 ms (exact match required)
• Contact Rating (Current): 3 A minimum (equal or greater acceptable)
• Switching Voltage: 277VAC minimum (equal or greater acceptable)
• Load Capacity: 831VA minimum (equal or greater acceptable)
• Operating Temperature Range: Must encompass or exceed -40°C ~ 70°C

The ALDP118W qualifies as a direct substitute because it maintains all critical electrical and mechanical parameters while offering enhanced contact current rating (5A vs. 3A) and expanded operating temperature range (-40°C ~ 85°C).

Parameter Comparison

Engineering Selection Recommendations

The ALDP118W is the qualified substitute for the obsolete ALD118 based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters are identical, including coil voltage (18VDC), contact form (SPST-NO), coil current (11.1 mA), and switching timing (10 ms operate/release). The ALDP118W provides enhanced current capacity (5A vs. 3A) and load switching capability (1385VA vs. 831VA), making it suitable for applications requiring the original 3A rating.

Mechanical Compatibility: Both relays feature identical through-hole mounting and PC pin termination, ensuring direct PCB compatibility without layout modifications.

Product Status: The ALD118 is obsolete, while the ALDP118W is actively manufactured by Panasonic Electric Works, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The ALDP118W carries ROHS3 compliance certification and maintains VDE approval alongside additional certifications (CQC, cURuus), meeting current regulatory requirements for new designs and system updates.

Temperature Performance: The ALDP118W extends the operating temperature range to -40°C ~ 85°C, providing improved thermal margin compared to the original -40°C ~ 70°C specification.

Frequently Asked Questions (FAQ)

Q: Can the ALDP118W directly replace the ALD118 without circuit modifications?

A: Yes. The ALDP118W maintains identical coil voltage, contact form, coil current, and switching timing. Through-hole mounting and PC pin termination are unchanged, allowing direct PCB substitution.

Q: What is the significance of the higher 5A contact rating on the ALDP118W?

A: The ALDP118W's 5A rating exceeds the ALD118's 3A specification. In applications requiring only 3A switching, the ALDP118W operates within its rated capacity with additional margin. This does not affect compatibility; it represents enhanced capability.

Q: Are there differences in packaging between these relays?

A: The ALD118 is supplied in bulk packaging, while the ALDP118W is supplied in tray packaging. This affects handling and storage but does not impact electrical or mechanical performance.

Q: How do the approval certifications differ?

A: The ALD118 carries CSA, TUV, UR, and VDE approvals. The ALDP118W carries CQC, cURuus, and VDE approvals. Both include VDE certification. The ALDP118W additionally meets ROHS3 compliance, which is required for current regulatory standards.

Q: Is the ALDP118W suitable for applications with temperature extremes?

A: The ALDP118W operates across -40°C ~ 85°C, compared to the ALD118's -40°C ~ 70°C range. This extended upper temperature limit provides additional thermal margin for applications approaching the original specification limits.

Q: What is the coil resistance, and is it identical between both relays?

A: Both the ALD118 and ALDP118W have a coil resistance of 1.62 kOhms. This identical resistance ensures equivalent coil current draw (11.1 mA at 18VDC) and power consumption characteristics.