ALZ21F18 Equivalent & Substitute Parts

Part Overview

The ALZ21F18 is a general purpose relay manufactured by Panasonic Electric Works, configured as a single-pole single-throw normally open (SPST-NO) device with an 18VDC coil. This through-hole mounted relay is rated for 16A switching capacity at 440VAC maximum, making it suitable for industrial control and switching applications. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

ALZ21F18

Panasonic Electric WorksIn Stock: 900ALZ21F18 Datasheet

Current PartRFQ

ALZ51F18

Panasonic Electric WorksIn Stock: 1221ALZ51F18 Datasheet

DirectRFQ

ALZ51F18T

Panasonic Electric WorksIn Stock: 1102ALZ51F18T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALZ21F18 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts ALZ51F18 and ALZ51F18T maintain identical specifications for coil voltage (18VDC), contact configuration (SPST-NO), current rating (16A), switching voltage (440VAC max), coil current (22.2 mA), coil resistance (810 Ohms), mounting type (through hole), termination style (PC pin), operating temperature range (-40°C ~ 105°C), contact material (Silver Tin Oxide), seal rating (sealed - flux protection), and coil insulation class (Class F).

The primary distinction between substitute parts is product status and packaging. ALZ51F18 and ALZ51F18T are both active products supplied in tube packaging, whereas the original ALZ21F18 is obsolete and supplied in standard packaging. Both substitutes carry identical electrical performance and mechanical compatibility with the original design.

Parameter Comparison

Engineering Selection Recommendations

Both ALZ51F18 and ALZ51F18T are direct functional equivalents to the obsolete ALZ21F18. Selection between these two active alternatives should be based on packaging requirements and supply chain considerations.

ALZ51F18 is supplied in tube packaging and maintains full electrical and mechanical compatibility with the original design. This part is recommended for standard procurement workflows where tube packaging is acceptable.

ALZ51F18T is also supplied in tube packaging with identical electrical specifications and RoHS compliance status. The "T" designation indicates a variant within the same product line, maintaining all critical parameters required for direct substitution.

Both substitute parts carry RoHS compliance certification, whereas the original ALZ21F18 does not specify RoHS status. Both maintain identical regulatory approvals (cURus, VDE) and identical ECCN and HTSUS classifications as the original part.

Frequently Asked Questions (FAQ)

Q: Can ALZ51F18 and ALZ51F18T be used interchangeably with ALZ21F18?

A: Yes. Both parts are parametric equivalents with identical electrical ratings, coil specifications, contact configurations, and mechanical mounting characteristics. The primary difference is product status (active versus obsolete) and packaging format (tube).

Q: What is the difference between ALZ51F18 and ALZ51F18T?

A: Both parts are active products with identical electrical and mechanical specifications. The "T" designation indicates a product line variant. Both are supplied in tube packaging and maintain full compatibility with the original ALZ21F18 design requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both ALZ51F18 and ALZ51F18T are RoHS compliant. The original ALZ21F18 does not specify RoHS status in available documentation.

Q: Do the substitute parts maintain the same regulatory approvals?

A: Yes. All three parts carry identical approval agency certifications (cURus, VDE) and share the same ECCN (EAR99) and HTSUS (8536.41.0050) classifications.

Q: What is the coil resistance and current draw for the substitute parts?

A: Both ALZ51F18 and ALZ51F18T maintain the same coil resistance of 810 Ohms and coil current of 22.2 mA as the original ALZ21F18, ensuring compatibility with existing drive circuits.

Q: Are there any temperature or environmental differences between the parts?

A: No. All three parts operate across the identical temperature range of -40°C to 105°C and maintain the same sealed flux protection rating and Class F coil insulation.