ALZ21F09 General Purpose Relay SPST 16A 9V - Equivalent & Substitute Parts

Part Overview

The ALZ21F09 is a general purpose relay manufactured by Panasonic Electric Works, featuring a SPST-NO (1 Form A) contact configuration with a 9VDC coil and 16A contact rating. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The relay is designed for through-hole mounting with sealed flux protection and operates across an industrial temperature range of -40°C to 105°C.

Substiute Parts

ALZ21F09

Panasonic Electric WorksIn Stock: 819ALZ21F09 Datasheet

Current PartRFQ

ALZ51F09

Panasonic Electric WorksIn Stock: 848ALZ51F09 Datasheet

DirectRFQ

ALZ51F09T

Panasonic Electric WorksIn Stock: 798ALZ51F09T Datasheet

Parametric EquivalentRFQ

1-1415540-6

TE Connectivity Potter & Brumfield RelaysIn Stock: 12271-1415540-6 Datasheet

SimilarRFQ

RZ03-1A4-D009

TE Connectivity Potter & Brumfield RelaysIn Stock: 2193RZ03-1A4-D009 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ALZ21F09 is determined by strict equivalence across the following critical parameters:

• Coil voltage: 9VDC
• Contact form: SPST-NO (1 Form A)
• Contact rating: 16 A minimum
• Mounting type: Through hole
• Termination style: PC pin
• Operating temperature range: Must support -40°C to 105°C minimum
• Coil resistance: 203 Ohms (±tolerance)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Panasonic Electric Works ALZ series): Parts that maintain identical electrical and mechanical specifications with active product status, providing direct replacement capability.

Cross-Manufacturer Equivalents (TE Connectivity Potter & Brumfield): Parts meeting all critical electrical parameters with compatible mechanical interfaces, though with minor variations in switching voltage or contact material that do not affect functional compatibility in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes (Active Product Status):

ALZ51F09 and ALZ51F09T are the primary recommended substitutes. Both are manufactured by Panasonic Electric Works with active product status, ensuring long-term availability and supply chain stability. These parts maintain identical electrical specifications and contact material composition (Silver Tin Oxide) as the original ALZ21F09, providing direct functional equivalence. Both are RoHS compliant and available in tube packaging.

Secondary Substitute (Active Product Status):

RZ03-1A4-D009 manufactured by TE Connectivity Potter & Brumfield is an active product suitable for applications where the upper operating temperature limit of 85°C is acceptable. This part meets all critical electrical parameters with equivalent coil resistance (200 Ohms, within tolerance of 203 Ohms) and identical contact rating. The contact material differs (Silver Nickel instead of Silver Tin Oxide), which is acceptable for general purpose switching applications. Switching voltage is rated at 400VAC maximum, which is lower than the original 440VAC specification but remains suitable for standard industrial applications.

Obsolete Substitute (Not Recommended for New Designs):

1-1415540-6 is classified as obsolete and should not be selected for new designs or long-term applications. While electrically compatible, its discontinued status creates supply chain risk.

Frequently Asked Questions (FAQ)

Q: Can ALZ51F09 directly replace ALZ21F09 in existing designs?

A: Yes. ALZ51F09 is a direct replacement with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and packaging format (tube vs. unspecified for the original). No circuit modifications are required.

Q: What is the difference between ALZ51F09 and ALZ51F09T?

A: Both parts are electrically and mechanically identical. The "T" designation indicates tube packaging. Selection between these variants depends on your procurement and assembly requirements.

Q: Can RZ03-1A4-D009 replace ALZ21F09 in all applications?

A: RZ03-1A4-D009 is suitable for most general purpose switching applications. However, verify compatibility if your application requires the full 440VAC switching voltage specification or the -40°C to 105°C temperature range. RZ03-1A4-D009 is rated to 400VAC maximum and -40°C to 85°C maximum.

Q: Why does RZ03-1A4-D009 have different contact material?

A: RZ03-1A4-D009 uses Silver Nickel (AgNi) contact material instead of Silver Tin Oxide (AgSnO). Both materials are suitable for general purpose relay applications and provide equivalent switching performance for standard loads. Contact material selection does not affect compatibility for typical industrial switching circuits.

Q: Are all substitute parts RoHS compliant?

A: ALZ51F09, ALZ51F09T, and RZ03-1A4-D009 are all RoHS compliant. The original ALZ21F09 RoHS status is not specified in available documentation. If RoHS compliance is a design requirement, select from the active substitutes listed above.

Q: What is the coil resistance tolerance for these relays?

A: Coil resistance is specified as 203 Ohms for Panasonic parts and 200 Ohms for the TE Connectivity RZ03-1A4-D009. The 3-Ohm difference is within acceptable tolerance for relay coil specifications and does not affect circuit operation.

Q: Can I use 1-1415540-6 as a substitute?

A: 1-1415540-6 meets all electrical specifications but is classified as obsolete. It is not recommended for new designs or applications requiring long-term supply availability. Use active substitutes (ALZ51F09, ALZ51F09T, or RZ03-1A4-D009) instead.