ALZ11B12W Equivalent & Substitute Parts

Part Overview

The ALZ11B12W is a general purpose relay manufactured by Panasonic Electric Works, featuring SPDT (1 Form C) contact configuration with 16A contact rating and 12VDC coil voltage. This through-hole mounted relay is designed for industrial control applications requiring reliable switching performance across a wide operating temperature range of -40°C to 85°C. The part is currently active in production status with ROHS3 compliance and sealed flux protection.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility allows for alternative manufacturers meeting identical electrical and mechanical specifications.

Substiute Parts

ALZ11B12W

Panasonic Electric WorksIn Stock: 1304ALZ11B12W Datasheet

Current PartRFQ

1-1415538-1

TE Connectivity Potter & Brumfield RelaysIn Stock: 18551-1415538-1 Datasheet

SimilarRFQ

RT314012

TE Connectivity Potter & Brumfield RelaysIn Stock: 16004RT314012 Datasheet

SimilarRFQ

RTH14012

TE Connectivity Potter & Brumfield RelaysIn Stock: 2186RTH14012 Datasheet

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RZ03-1C4-D012

TE Connectivity Potter & Brumfield RelaysIn Stock: 2475RZ03-1C4-D012 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ALZ11B12W is determined by strict equivalence across the following critical parameters:

• Coil voltage: 12VDC (exact match required)
• Contact form: SPDT (1 Form C) (exact match required)
• Contact rating: 16A minimum (exact match required)
• Coil current: 33.3 mA (exact match required)
• Coil resistance: 360 Ohms (exact match required)
• Mounting type: Through hole (exact match required)
• Termination style: PC pin (exact match required)
• Must operate voltage: 8.4 VDC (exact match required)
• Must release voltage: 1.2 VDC (exact match required)

All four substitute parts (RTH14012, RZ03-1C4-D012, 1-1415538-1, RT314012) meet these core electrical and mechanical requirements. Variations in switching voltage maximum, operating temperature range, contact material composition, and seal rating are within acceptable tolerance for general purpose relay applications.

Parameter Comparison

Engineering Selection Recommendations

RTH14012 and RZ03-1C4-D012 are preferred substitutes for the ALZ11B12W. Both parts maintain active product status, ROHS3 compliance, and REACH unaffected designation. RTH14012 offers extended operating temperature capability to 105°C. RZ03-1C4-D012 maintains the same -40°C to 85°C operating range as the primary part.

RT314012 is an acceptable substitute with active status, ROHS3 compliance, and REACH unaffected designation. It provides sealed flux protection equivalent to the ALZ11B12W and supports the same operating temperature range.

1-1415538-1 is not recommended for new designs due to obsolete product status, despite meeting electrical specifications. This part carries REACH affected designation, requiring additional compliance documentation for certain applications.

Frequently Asked Questions (FAQ)

Q: Can RTH14012 replace ALZ11B12W in all applications?

A: RTH14012 meets all critical electrical and mechanical parameters required for direct substitution. The extended operating temperature range to 105°C provides additional capability beyond the ALZ11B12W specification of -40°C to 85°C. Switching voltage maximum is 400VAC versus 440VAC on the primary part; this represents a minor reduction suitable for general purpose relay applications.

Q: What is the difference between sealed and unsealed relay options?

A: ALZ11B12W and RT314012 feature sealed flux protection, while RTH14012 and RZ03-1C4-D012 are unsealed. Sealed construction provides enhanced protection against flux contamination during PCB assembly processes. Unsealed relays are suitable for applications where flux exposure is controlled or post-assembly cleaning is performed.

Q: Are contact material differences significant?

A: ALZ11B12W uses Silver Tin Oxide (AgSnO) contacts, while all TE Connectivity substitutes use Silver Nickel (AgNi). Both materials are standard for 16A general purpose relay applications. Contact material selection does not affect substitution eligibility for this product category.

Q: Why is 1-1415538-1 marked as obsolete?

A: 1-1415538-1 has reached end-of-life status with TE Connectivity. While electrical specifications remain valid, obsolete parts present supply chain risk and may require extended lead times or premium pricing. Active alternatives (RTH14012, RZ03-1C4-D012, RT314012) are recommended for new designs.

Q: What does REACH affected status mean for 1-1415538-1?

A: REACH affected designation indicates the part may contain substances of concern under EU REACH regulations. This requires additional compliance documentation and may restrict use in certain applications or geographic markets. REACH unaffected parts (RTH14012, RZ03-1C4-D012, RT314012) eliminate this compliance requirement.

Q: Are timing differences between parts critical?

A: ALZ11B12W operates in 15 ms with 5 ms release time, while TE Connectivity substitutes operate in 8 ms with 6 ms release time. These differences are within acceptable tolerance for general purpose relay applications. Applications requiring specific timing characteristics should be evaluated individually.

Q: Does packaging format affect electrical performance?

A: Packaging format (bulk versus tube) does not affect electrical or mechanical performance. Packaging selection is driven by inventory management, handling requirements, and assembly process compatibility. All parts are functionally equivalent regardless of packaging format.