ALZ12B12W General Purpose Relay SPDT 12VDC 16A Equivalent & Substitute Parts

Part Overview

The ALZ12B12W is a general purpose relay manufactured by Panasonic Electric Works, featuring a single pole double throw (SPDT) contact configuration with 16A current rating and 12VDC coil voltage. This through-hole mounted relay is designed for industrial control applications requiring sealed, fully protected operation across extended temperature ranges. The part is currently active in production status. Substitute parts become necessary when addressing supply chain constraints, obsolescence planning, or when alternative manufacturers' components meet identical electrical and mechanical specifications for direct board-level replacement.

Substiute Parts

ALZ12B12W

Panasonic Electric WorksIn Stock: 888ALZ12B12W 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

SimilarRFQ

RZ03-1C4-D012

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ALZ12B12W is determined by strict equivalence across the following critical parameters: coil voltage (12VDC), contact form (SPDT), contact current rating (16A), coil current (33.3 mA), coil resistance (360 Ohms), mounting type (through hole), termination style (PC pin), must-operate voltage (8.4 VDC), must-release voltage (1.2 VDC), and coil type (non-latching). All identified substitute parts meet these core electrical specifications. Variations in switching voltage maximum (400VAC vs. 440VAC), contact material composition (Silver Nickel vs. Silver Tin Oxide), coil insulation class (Class F vs. Class B), seal rating designation, and operating temperature upper limits do not preclude substitution when the application requirements fall within the substitute part's rated parameters. Switching voltage tolerance, contact material, and temperature range represent secondary considerations dependent on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts (1-1415538-1, RT314012, RTH14012, RZ03-1C4-D012) satisfy the core electrical and mechanical requirements for direct replacement of the ALZ12B12W. Selection should prioritize active production status and compliance certifications.

RT314012 and RZ03-1C4-D012 are recommended as primary substitutes, both maintaining active product status with ROHS3 compliance and matching the ALZ12B12W operating temperature range of -40°C to 85°C. RT314012 provides sealed flux protection, while RZ03-1C4-D012 offers standard sealing. Both are available in high inventory quantities (15,928 and 2,458 units respectively).

RTH14012 remains a viable alternative with active status and extended temperature capability (-40°C to 105°C), though it carries no seal rating designation. This part is available in 2,120 units.

Part 1-1415538-1 carries obsolete product status and should be avoided for new designs despite meeting electrical specifications. This designation indicates discontinued manufacturing and potential supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can RT314012 directly replace ALZ12B12W on existing PCBs? A: Yes. Both parts share identical coil voltage (12VDC), contact form (SPDT), current rating (16A), coil current (33.3 mA), coil resistance (360 Ohms), mounting type (through hole), and PC pin termination. Electrical performance is equivalent within specified operating parameters.

Q: What is the significance of the 40VAC difference in maximum switching voltage? A: The ALZ12B12W supports 440VAC maximum switching, while TE Connectivity substitutes support 400VAC maximum. This difference is application-dependent. If your circuit operates below 400VAC, all substitutes are suitable. If operation requires 400-440VAC switching capability, the ALZ12B12W provides additional margin.

Q: Why do substitute parts use Silver Nickel contacts instead of Silver Tin Oxide? A: Contact material composition affects contact resistance, wear characteristics, and arc suppression properties. Both materials are suitable for general purpose relay applications. Selection depends on specific load characteristics and switching frequency requirements not specified in this comparison.

Q: Is the extended temperature range of RTH14012 (-40°C to 105°C) beneficial? A: Extended temperature capability provides design margin for applications approaching thermal limits. If your application operates within -40°C to 85°C, this additional range offers no functional advantage. If sustained operation above 85°C is required, RTH14012 becomes the appropriate selection.

Q: Should I avoid 1-1415538-1 due to obsolete status? A: Yes. Obsolete designation indicates the manufacturer has discontinued production. While current inventory exists (1,811 units), future availability cannot be assured. New designs should specify active-status alternatives: RT314012, RTH14012, or RZ03-1C4-D012.

Q: Are all substitutes RoHS compliant? A: Yes. The ALZ12B12W carries RoHS compliance. All four substitute parts carry ROHS3 compliance, meeting current regulatory requirements for restricted substances in electrical and electronic equipment.

Q: What packaging differences exist between these parts? A: ALZ12B12W is supplied in bulk packaging. All TE Connectivity substitutes are supplied in tube packaging. Tube packaging provides component protection during handling and storage. Bulk and tube packaging are functionally equivalent for PCB assembly operations.