Equivalent & Substitute Parts for ALZ21F12

Part Overview

The ALZ21F12 is a general purpose relay manufactured by Panasonic Electric Works, configured as a SPST-NO (1 Form A) with a 12VDC coil and 16A contact rating. This through-hole mounted relay is designed for general industrial switching applications with sealed flux protection and Class F coil insulation.

The ALZ21F12 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements.

Key Parameters

Parameter	Value
Coil Voltage	12VDC
Contact Form	SPST-NO (1 Form A)
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 ~ 105°C
Must Operate Voltage	8.4 VDC
Must Release Voltage	1.2 VDC

Substitute Part Grouping Explanation

Substitution eligibility for the ALZ21F12 is determined by strict equivalence across the following critical parameters:

Coil voltage: 12VDC
Contact form: SPST-NO (1 Form A)
Contact rating: 16 A minimum
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

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical and mechanical specifications, differing only in product status or packaging format.

Similar Equivalents: Parts meeting all critical electrical parameters with minor variations in switching voltage tolerance, operating temperature range, contact material composition, or timing characteristics (operate/release times). These parts are functionally compatible for the same application class.

Parameter Comparison

Part Number	Manufacturer	Product Status	Coil Voltage	Contact Form	Contact Rating	Coil Current	Coil Resistance	Switching Voltage (Max)	Operating Temperature	Contact Material	Operate Time	Release Time	RoHS Status
ALZ21F12	Panasonic Electric Works	Obsolete	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	440VAC	-40°C ~ 105°C	Silver Tin Oxide (AgSnO)	15 ms	5 ms	Not Specified
ALZ51F12	Panasonic Electric Works	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	440VAC	-40°C ~ 105°C	Silver Tin Oxide (AgSnO)	15 ms	5 ms	Not Specified
ALZ51F12T	Panasonic Electric Works	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	440VAC	-40°C ~ 105°C	Silver Tin Oxide (AgSnO)	15 ms	5 ms	ROHS3 Compliant
1-1415527-1	TE Connectivity Potter & Brumfield Relays	Obsolete	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 85°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
1-1415536-9	TE Connectivity Potter & Brumfield Relays	Obsolete	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 105°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
4-1415536-2	TE Connectivity Potter & Brumfield Relays	Obsolete	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 105°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
4-1415899-9	TE Connectivity Potter & Brumfield Relays	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 85°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
7-1415899-2	TE Connectivity Potter & Brumfield Relays	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 85°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
8-1415047-1	TE Connectivity Potter & Brumfield Relays	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 105°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant
G2RL-1A-E DC12	Omron Electronics Inc-EMC Div	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	440VAC, 300VDC	-40°C ~ 85°C	Silver Alloy, Cadmium Free	15 ms	5 ms	ROHS3 Compliant
RT334012F	TE Connectivity Potter & Brumfield Relays	Active	12VDC	SPST-NO	16 A	33.3 mA	360 Ω	400VAC	-40°C ~ 85°C	Silver Nickel (AgNi)	8 ms	6 ms	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

ALZ51F12T is the preferred direct substitute. This part maintains identical electrical specifications and timing characteristics to the ALZ21F12 while offering active product status and ROHS3 compliance. The ALZ51F12 (non-T variant) provides equivalent functionality with active status but lacks explicit RoHS certification documentation.

Secondary Recommendations - Similar Equivalents with Active Status:

G2RL-1A-E DC12 (Omron) and 8-1415047-1 (TE Connectivity) are functionally compatible alternatives. Both maintain the full operating temperature range (-40°C ~ 105°C) required by the original specification. G2RL-1A-E DC12 offers enhanced switching voltage capability (440VAC, 300VDC) and cadmium-free contact material. Both parts carry ROHS3 compliance and active product status.

Alternative Options - Similar Equivalents with Reduced Temperature Range:

4-1415899-9, 7-1415899-2, and RT334012F are active-status alternatives suitable for applications where the upper operating temperature limit can be reduced to 85°C. These parts maintain all critical electrical parameters and coil specifications.

Obsolete Alternatives - Not Recommended for New Designs:

1-1415527-1, 1-1415536-9, and 4-1415536-2 carry obsolete product status and should not be selected for new designs or long-term supply requirements.

Frequently Asked Questions (FAQ)

Q: Can ALZ51F12T directly replace ALZ21F12 in existing designs?

A: Yes. ALZ51F12T is a direct electrical and mechanical equivalent with identical coil voltage (12VDC), contact form (SPST-NO), contact rating (16A), coil current (33.3 mA), coil resistance (360 Ohms), and timing characteristics (15 ms operate, 5 ms release). The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What are the key differences between Panasonic ALZ51F12T and TE Connectivity alternatives?

A: Panasonic parts (ALZ51F12, ALZ51F12T) use Silver Tin Oxide contact material and maintain 440VAC maximum switching voltage. TE Connectivity parts use Silver Nickel contact material with 400VAC maximum switching voltage. TE Connectivity parts exhibit faster switching times (8 ms operate, 6 ms release vs. 15 ms and 5 ms). Both maintain identical coil specifications and 16A contact rating.

Q: Is G2RL-1A-E DC12 compatible with applications requiring 440VAC switching?

A: Yes. G2RL-1A-E DC12 supports 440VAC switching voltage, matching the original ALZ21F12 specification. This part also supports 300VDC switching, providing broader application flexibility. Contact material is cadmium-free silver alloy.

Q: What packaging formats are available?

A: ALZ51F12 and ALZ51F12T are supplied in tube packaging. TE Connectivity parts are available in bulk or tube formats depending on part number. G2RL-1A-E DC12 is supplied in tube packaging. RT334012F is supplied in box packaging.

Q: Are all substitute parts RoHS compliant?

A: ALZ51F12T, all TE Connectivity parts, G2RL-1A-E DC12, and RT334012F carry ROHS3 compliance. ALZ51F12 does not specify RoHS status in available documentation.

Q: Which substitute is recommended for applications with upper temperature limits of 85°C?

A: 4-1415899-9, 7-1415899-2, RT334012F, and G2RL-1A-E DC12 are all suitable for 85°C maximum operating temperature. For applications requiring the full -40°C ~ 105°C range, select ALZ51F12T, 1-1415536-9, 4-1415536-2, or 8-1415047-1.

Q: Can I use TE Connectivity parts in place of Panasonic parts without circuit modification?

A: Yes, for applications where 400VAC switching voltage is acceptable. TE Connectivity parts maintain identical coil voltage, contact rating, coil current, and coil resistance. The faster switching times (8 ms vs. 15 ms operate) may benefit circuit performance. Verify that your application does not require the higher 440VAC switching capability of Panasonic parts.

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