TN2-L2-4.5V Equivalent & Substitute Parts

Part Overview

The TN2-L2-4.5V is a general purpose relay manufactured by Panasonic Electric Works, configured as a DPDT (2 Form C) with 1A contact rating and 4.5VDC coil voltage. This through-hole mounted relay features latching dual coil operation with sealed construction and silver/gold contact materials. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where this relay specification remains applicable.

Key Parameters

Parameter	Value
Manufacturer Part Number	TN2-L2-4.5V
Manufacturer	Panasonic Electric Works
Coil Voltage	4.5VDC
Contact Form	DPDT (2 Form C)
Contact Rating (Current)	1 A
Mounting Type	Through Hole
Coil Type	Latching, Dual Coil
Termination Style	PC Pin
Seal Rating	Sealed - Fully
Operating Temperature Range	-40°C ~ 70°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TN2-L2-4.5V is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Contact form: DPDT (2 Form C)
Mounting type: Through Hole
Termination style: PC Pin
Coil type: Latching, Dual Coil
Seal rating: Sealed - Fully

Operational Parameters:

Coil voltage: 4.5VDC (or compatible voltage within system tolerance)
Contact rating: Minimum 1A (higher ratings acceptable for uprating margin)
Switching voltage: Minimum 125VAC, 110VDC capability

The identified substitute parts meet these core requirements while offering enhanced specifications in contact current rating and operating temperature range, providing improved performance margins for replacement applications.

Parameter Comparison

Parameter	TN2-L2-4.5V	TX2-LT-4.5V-TH	V23079B1201B301
Manufacturer	Panasonic Electric Works	Panasonic Electric Works	TE Connectivity Potter & Brumfield Relays
Coil Voltage	4.5VDC	4.5VDC	5VDC
Contact Form	DPDT (2 Form C)	DPDT (2 Form C)	DPDT (2 Form C)
Contact Rating (Current)	1 A	2 A	2 A
Switching Voltage	125VAC, 110VDC - Max	250VAC, 220VDC - Max	250VAC, 220VDC - Max
Coil Current	44.4 mA	31 mA	28 mA
Coil Type	Latching, Dual Coil	Latching, Dual Coil	Latching, Dual Coil
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Seal Rating	Sealed - Fully	Sealed - Fully	-
Operating Temperature	-40°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Contact Material	Silver (Ag), Gold (Au)	Silver (Ag), Gold (Au)	Silver Nickel (AgNi), Gold (Au)
Coil Resistance	101 Ohms	145 Ohms	178 Ohms
Must Operate Voltage	3.38 VDC	3.38 VDC	3.75 VDC
Operate Time	3 ms	4 ms	4 ms
Release Time	3 ms	4 ms	4 ms
Product Status	Obsolete	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TX2-LT-4.5V-TH (Panasonic Electric Works)

This substitute maintains identical coil voltage (4.5VDC) and must-operate voltage (3.38 VDC), ensuring direct compatibility with existing drive circuits. The part is active in production with ROHS3 compliance. Contact current rating doubles to 2A, providing increased switching capacity. Operating temperature range extends to 85°C. Coil current reduces to 31 mA, lowering power consumption. This part represents the closest functional equivalent within the Panasonic product line.

V23079B1201B301 (TE Connectivity Potter & Brumfield Relays)

This substitute offers ROHS3 compliance and active product status. Coil voltage is 5VDC, requiring circuit verification for compatibility. Must-operate voltage is 3.75 VDC, slightly higher than the original. Contact current rating is 2A with enhanced switching voltage capability (250VAC, 220VDC). Operating temperature range extends to 85°C. Coil current is 28 mA, the lowest among all options. This part is suitable where 5VDC coil supply is available or where the 0.37 VDC higher must-operate threshold is acceptable.

Frequently Asked Questions (FAQ)

Q: Can TX2-LT-4.5V-TH directly replace TN2-L2-4.5V without circuit modification?

A: Yes. Both parts operate at 4.5VDC with identical must-operate voltage (3.38 VDC), identical contact form (DPDT), identical coil type (latching dual coil), and identical termination style (PC Pin). The higher contact current rating (2A vs 1A) and extended temperature range are uprating improvements with no negative impact on existing circuits.

Q: What is the key difference between TX2-LT-4.5V-TH and V23079B1201B301?

A: The primary difference is coil voltage: TX2-LT-4.5V-TH operates at 4.5VDC matching the original part, while V23079B1201B301 requires 5VDC. The V23079B1201B301 has a higher must-operate voltage (3.75 VDC vs 3.38 VDC). Both offer 2A contact rating and extended operating temperature to 85°C.

Q: Is the V23079B1201B301 suitable if my circuit supplies 4.5VDC?

A: The part is rated for 5VDC coil voltage. Operation at 4.5VDC is below the specified rating and may result in insufficient coil current to reliably operate the relay. Circuit verification is required.

Q: Do all substitute parts have identical PC Pin termination?

A: Yes. All three parts use PC Pin termination style, ensuring mechanical and electrical compatibility with through-hole PCB mounting.

Q: What is the impact of different coil resistance values?

A: Coil resistance affects current draw at rated voltage. TN2-L2-4.5V draws 44.4 mA at 4.5VDC (101 Ohms). TX2-LT-4.5V-TH draws 31 mA (145 Ohms), and V23079B1201B301 draws 28 mA at 5VDC (178 Ohms). Lower current consumption reduces power supply loading and heat generation.

Q: Are all parts sealed?

A: TN2-L2-4.5V and TX2-LT-4.5V-TH are both fully sealed. V23079B1201B301 seal rating is not specified in available data.

Q: What is the significance of the extended operating temperature range in substitute parts?

A: TX2-LT-4.5V-TH and V23079B1201B301 both extend the upper operating limit to 85°C compared to the original 70°C. This provides improved thermal margin for applications in elevated ambient conditions or high-density PCB layouts.

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