ALZ22B12 General Purpose Relay SPST 16A 12VDC Equivalent & Substitute Parts

Part Overview

The ALZ22B12 is a general purpose relay manufactured by Panasonic Electric Works, configured as a single-pole single-throw normally open (SPST-NO) contact form with a 12VDC coil. This through-hole mounted relay is rated for 16A at 440VAC maximum switching voltage and features sealed construction with Class B coil insulation. The part is currently obsolete, making equivalent substitutes necessary for ongoing maintenance and repair applications where this relay specification is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	ALZ22B12
Manufacturer	Panasonic Electric Works
Contact Form	SPST-NO (1 Form A)
Coil Voltage	12VDC
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 to 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ALZ22B12 is determined by strict equivalence across the following critical parameters:

Contact Form: SPST-NO (1 Form A) configuration required
Coil Voltage: 12VDC nominal
Contact Rating: 16A minimum
Coil Current: 33.3 mA
Coil Resistance: 360 Ohms
Mounting Type: Through Hole with PC Pin termination
Switching Voltage: 400VAC or higher maximum rating

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in contact material (Silver Tin Oxide vs. Silver Nickel), seal rating, coil insulation class, and operating temperature range are noted but do not prevent functional substitution when the above parameters align.

Parameter Comparison

Part Number	Manufacturer	Contact Form	Coil Voltage	Contact Rating (A)	Switching Voltage (Max)	Coil Current (mA)	Coil Resistance (Ω)	Operating Temp (°C)	Product Status	Contact Material
ALZ22B12	Panasonic Electric Works	SPST-NO	12VDC	16	440VAC	33.3	360	-40 to 85	Obsolete	Silver Tin Oxide
1-1415527-1	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Obsolete	Silver Nickel
1-1415536-9	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 105	Obsolete	Silver Nickel
4-1415536-2	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 105	Obsolete	Silver Nickel
4-1415899-9	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Active	Silver Nickel
7-1415899-2	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Active	Silver Nickel
8-1415047-1	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 105	Active	Silver Nickel
RT33K012	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Active	Silver Nickel
RT33L012	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Active	Silver Tin Oxide
RTD34012	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 85	Active	Silver Nickel
RTH34012	TE Connectivity Potter & Brumfield	SPST-NO	12VDC	16	400VAC	33.3	360	-40 to 105	Active	Silver Nickel

Engineering Selection Recommendations

For applications requiring the ALZ22B12 specification, the following selection criteria apply:

Active Product Status Priority: Parts with Active product status are preferred for new designs and long-term availability. The following active substitutes are available: 4-1415899-9, 7-1415899-2, 8-1415047-1, RT33K012, RT33L012, RTD34012, and RTH34012.

Compliance Considerations: All substitute parts listed are RoHS3 compliant and carry EAR99 ECCN classification. The ALZ22B12 is REACH Unaffected, while TE Connectivity substitutes are REACH Affected. This distinction may be relevant for specific regulatory environments.

Contact Material Equivalence: RT33L012 maintains Silver Tin Oxide contact material identical to the ALZ22B12. All other substitutes use Silver Nickel contact material, which is functionally equivalent for the specified 16A 12VDC SPST-NO application.

Temperature Range Consideration: The ALZ22B12 operates from -40°C to 85°C. Substitutes 1-1415536-9, 4-1415536-2, 8-1415047-1, and RTH34012 extend the upper operating limit to 105°C, providing enhanced thermal margin in high-temperature environments.

Switching Voltage Derating: The ALZ22B12 is rated for 440VAC maximum switching voltage. All TE Connectivity substitutes are rated for 400VAC maximum. This 40VAC reduction does not affect standard industrial AC applications but should be confirmed for high-voltage switching circuits.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly into a circuit designed for ALZ22B12?

A: Yes, all listed parts maintain the critical electrical parameters: 12VDC coil, 16A contact rating, 33.3mA coil current, 360 Ohm coil resistance, and SPST-NO contact form. Through-hole PC pin termination is identical across all parts. Physical footprint compatibility should be confirmed with PCB layout documentation.

Q: What is the difference between Silver Tin Oxide and Silver Nickel contact materials?

A: Both materials are suitable for 16A 12VDC switching applications. Silver Tin Oxide (ALZ22B12, RT33L012) provides slightly different contact wear characteristics compared to Silver Nickel. For direct replacement, RT33L012 maintains material equivalence with the original part.

Q: Why do some substitutes have a higher maximum operating temperature?

A: Parts rated to 105°C (1-1415536-9, 4-1415536-2, 8-1415047-1, RTH34012) are designed for extended thermal environments. The ALZ22B12 specification of -40°C to 85°C is sufficient for standard industrial applications. Higher temperature ratings do not affect compatibility but provide additional margin for thermally demanding installations.

Q: What is the significance of Active vs. Obsolete product status?

A: Obsolete parts (ALZ22B12, 1-1415527-1, 1-1415536-9, 4-1415536-2) are no longer manufactured and available only from existing inventory. Active parts (4-1415899-9, 7-1415899-2, 8-1415047-1, RT33K012, RT33L012, RTD34012, RTH34012) are currently produced and recommended for new applications and long-term supply assurance.

Q: Does the 40VAC difference in switching voltage rating affect my application?

A: The ALZ22B12 is rated for 440VAC maximum; TE Connectivity substitutes are rated for 400VAC maximum. For standard industrial AC applications operating at 120VAC, 240VAC, or 380VAC, this difference is not significant. Confirm the actual switching voltage in your circuit design before selection.

Q: Are all these parts RoHS compliant?

A: All substitute parts are RoHS3 compliant. The ALZ22B12 does not specify RoHS status in the provided data. All parts carry EAR99 ECCN classification and are suitable for standard commercial and industrial applications.

Q: What packaging options are available?

A: Substitute parts are available in Bulk, Tube, and Tube packaging configurations. Packaging selection depends on procurement volume and handling requirements but does not affect electrical or mechanical compatibility.

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