ALZ11B12 General Purpose Relay SPDT 16A 12VDC - Equivalent & Substitute Parts

Part Overview

The ALZ11B12 is a general purpose relay manufactured by Panasonic Electric Works, featuring a single pole double throw (SPDT) contact configuration with 16A contact rating and 12VDC coil voltage. This through-hole mounted relay is designed for industrial control applications requiring reliable switching of AC loads up to 440VAC maximum.

The ALZ11B12 maintains active product status with 1454 units in current inventory. Substitute parts become necessary when addressing supply chain constraints, regional availability limitations, or when design requirements permit functional equivalents from alternative manufacturers. All listed substitutes maintain identical electrical specifications for coil voltage, contact form, contact rating, and coil current, ensuring direct functional replacement capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	ALZ11B12
Manufacturer	Panasonic Electric Works
Coil Voltage	12VDC
Contact Form	SPDT (1 Form C)
Contact Rating (Current)	16 A
Switching Voltage (Max)	440VAC
Coil Current	33.3 mA
Coil Resistance	360 Ohms
Mounting Type	Through Hole
Termination Style	PC Pin
Operating Temperature Range	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ALZ11B12 is determined by strict equivalence across the following critical parameters:

Coil voltage: 12VDC (exact match required)
Contact form: SPDT (1 Form C) configuration
Contact rating: 16A minimum
Coil current: 33.3 mA (exact match required)
Coil resistance: 360 Ohms (exact match required)
Mounting type: Through hole
Termination style: PC pin
Packaging: Tube

All five substitute parts listed below satisfy these criteria. Variations in switching voltage maximum (400VAC vs 440VAC), operating temperature range, contact material composition, and seal rating do not preclude substitution when the application requirements fall within the lower specification limits. Product status (active vs obsolete) and compliance certifications are secondary considerations that may influence procurement strategy but do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	ALZ11B12 (Panasonic)	1-1415538-1 (TE Connectivity)	RT314012 (TE Connectivity)	RTD14012F (TE Connectivity)	RTH14012 (TE Connectivity)	RZ03-1C4-D012 (TE Connectivity)
Coil Voltage	12VDC	12VDC	12VDC	12VDC	12VDC	12VDC
Contact Form	SPDT (1 Form C)	SPDT (1 Form C)	SPDT (1 Form C)	SPDT (1 Form C)	SPDT (1 Form C)	SPDT (1 Form C)
Contact Rating (Current)	16 A	16 A	16 A	16 A	16 A	16 A
Switching Voltage (Max)	440VAC	400VAC	400VAC	400VAC	400VAC	400VAC
Coil Current	33.3 mA	33.3 mA	33.3 mA	33.3 mA	33.3 mA	33.3 mA
Coil Resistance	360 Ohms	360 Ohms	360 Ohms	360 Ohms	360 Ohms	360 Ohms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C
Contact Material	Silver Tin Oxide (AgSnO)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Nickel (AgNi)
Operate Time	15 ms	8 ms	8 ms	8 ms	8 ms	8 ms
Release Time	5 ms	6 ms	6 ms	6 ms	6 ms	6 ms
Coil Insulation	Class B	Class F	Class F	Class F	Class F	Class F
Product Status	Active	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All five substitute parts are electrically and mechanically compatible with the ALZ11B12 for applications operating within 400VAC maximum switching voltage and -40°C to 85°C ambient temperature ranges.

For new designs and ongoing procurement, RT314012, RTD14012F, and RZ03-1C4-D012 are preferred selections due to active product status and confirmed availability. RT314012 offers the highest inventory level (15,928 units) and represents the optimal choice for volume requirements. RTD14012F provides enhanced seal rating (Sealed - Fully) for applications requiring maximum environmental protection. RZ03-1C4-D012 maintains unlimited moisture sensitivity rating (MSL 1) suitable for standard storage and handling conditions.

RTH14012 remains available with active status and extended operating temperature capability (-40°C to 105°C), making it suitable for applications requiring thermal performance beyond the standard -40°C to 85°C range.

The part 1-1415538-1 carries obsolete product status and should be avoided for new procurement despite current inventory availability. This part is listed for reference only when addressing legacy system maintenance or repair scenarios where original specification matching is mandatory.

Frequently Asked Questions (FAQ)

Q: Can I substitute RT314012 for ALZ11B12 in my existing design?

A: Yes. RT314012 maintains identical coil voltage (12VDC), contact form (SPDT), contact rating (16A), coil current (33.3 mA), and coil resistance (360 Ohms). The 400VAC maximum switching voltage is lower than the ALZ11B12 specification (440VAC), but this does not affect compatibility if your application operates at or below 400VAC. Both parts use through-hole PC pin termination and are ROHS3 compliant.

Q: What is the difference between RTD14012F and RTH14012?

A: Both parts are electrically identical with 12VDC coil voltage, 16A contact rating, and 360 Ohm coil resistance. RTD14012F features Sealed - Fully seal rating and Class F coil insulation. RTH14012 offers extended operating temperature range (-40°C to 105°C versus -40°C to 85°C) and does not specify a seal rating. Select RTD14012F for sealed applications; select RTH14012 for high-temperature environments exceeding 85°C.

Q: Why does the ALZ11B12 have a higher switching voltage rating (440VAC) than the TE Connectivity substitutes (400VAC)?

A: The ALZ11B12 is rated for 440VAC maximum switching voltage, while all TE Connectivity substitutes are rated for 400VAC maximum. This specification difference reflects different design and testing standards between manufacturers. For applications operating at 400VAC or below, all substitutes are fully compatible. Applications requiring 440VAC operation must retain the ALZ11B12.

Q: Is 1-1415538-1 suitable for new designs?

A: No. Although 1-1415538-1 is electrically compatible and currently in stock (1,811 units), it carries obsolete product status. Obsolete parts face discontinuation risk and may experience supply interruptions. Use 1-1415538-1 only for legacy system repairs where original part specification matching is required. For new designs, select from active-status alternatives: RT314012, RTD14012F, RTH14012, or RZ03-1C4-D012.

Q: Do all substitutes use the same contact material as the ALZ11B12?

A: No. The ALZ11B12 uses Silver Tin Oxide (AgSnO) contact material, while all five TE Connectivity substitutes use Silver Nickel (AgNi). Both materials are suitable for general purpose relay applications and provide equivalent switching performance for standard industrial loads. Contact material selection does not affect substitution eligibility for this product category.

Q: What is the significance of the operate and release time differences?

A: The ALZ11B12 has operate time of 15 ms and release time of 5 ms. All TE Connectivity substitutes have operate time of 8 ms and release time of 6 ms. These timing differences are minor and do not affect compatibility for standard control applications. Applications with critical timing requirements (such as high-speed switching or precise sequencing) should evaluate whether the faster operate time of substitutes (8 ms vs 15 ms) is acceptable for the specific circuit design.

Q: Are all substitutes available in tube packaging?

A: Yes. All substitute parts listed are supplied in tube packaging, matching the ALZ11B12 packaging format. This ensures compatibility with standard component handling, storage, and automated assembly processes.

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