LM341T-15 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM341T-15 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 15V output at 500mA in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM341T-15 provides over-current, over-temperature, and short-circuit protection across an operating temperature range of -40°C to 125°C with a maximum input voltage of 35V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	500mA
Input Voltage (Max)	35V
Quiescent Current	4mA
PSRR @ 120Hz	69dB
Operating Temperature Range	-40°C to 125°C
Package	TO-220-3
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM341T-15 is determined by the following criteria:

Primary Substitution Criteria:

Fixed output voltage of 15V
TO-220-3 package (through-hole mounting)
Output current capability of 500mA or greater
Maximum input voltage of 35V or greater
Operating temperature range compatibility
Protection features (over-current, over-temperature, short-circuit)

Substitution Categories:

Direct Equivalent (Pin-Compatible, Identical Specifications): LM341T-15/NOPB from Texas Instruments maintains identical electrical specifications and packaging, with the primary difference being active product status and RoHS3 compliance.

Higher Current Capacity Substitutes (500mA to 1.5A): Parts including L7815ABV, L7815ACV, L7815CV, and MC7815ABTG, MC7815ACTG, MC7815BTG provide 1A to 1.5A output current while maintaining 15V fixed output and TO-220-3 packaging. These are suitable where higher current headroom is acceptable.

Matched Current Capacity Substitutes (500mA): L78M15ABV and L78M15CV from STMicroelectronics provide 500mA output current matching the original specification, with obsolete product status similar to the LM341T-15.

Higher Current Capacity Substitutes (2A): L78S15CV provides 2A output current for applications requiring significantly higher current capacity while maintaining 15V output and TO-220-3 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	PSRR @ 120Hz	Operating Temp Range	Product Status	RoHS Status
LM341T-15	Texas Instruments	15V	500mA	35V	4mA	69dB	-40°C to 125°C	Obsolete	Non-compliant
LM341T-15/NOPB	Texas Instruments	15V	500mA	35V	4mA	69dB	-40°C to 125°C	Active	ROHS3 Compliant
L7815ABV	STMicroelectronics	15V	1.5A	35V	6mA	58dB	-40°C to 125°C	Active	ROHS3 Compliant
L7815ACV	STMicroelectronics	15V	1.5A	35V	6mA	58dB	0°C to 125°C	Active	ROHS3 Compliant
L7815CV	STMicroelectronics	15V	1.5A	35V	8mA	54dB	0°C to 125°C	Active	ROHS3 Compliant
L78M15ABV	STMicroelectronics	15V	500mA	35V	6mA	54dB	-40°C to 125°C	Obsolete	ROHS3 Compliant
L78M15CV	STMicroelectronics	15V	500mA	35V	6mA	54dB	0°C to 125°C	Obsolete	ROHS3 Compliant
L78S15CV	STMicroelectronics	15V	2A	35V	8mA	46dB	0°C to 150°C	Obsolete	ROHS3 Compliant
MC7815ABTG	onsemi	15V	1A	35V	6mA	80dB	-40°C to 125°C	Active	ROHS3 Compliant
MC7815ACTG	onsemi	15V	1A	35V	6mA	80dB	0°C to 125°C	Active	ROHS3 Compliant
MC7815BTG	onsemi	15V	1A	35V	8mA	58dB	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Product Status: LM341T-15/NOPB is the primary choice, offering identical electrical specifications to the original LM341T-15 while maintaining active product status and RoHS3 compliance. This part is suitable for designs requiring no circuit modifications.

For Active Product Status with Higher Current Capacity: MC7815ABTG from onsemi provides 1A output current with active product status, RoHS3 compliance, and extended temperature range (-40°C to 125°C). This part offers superior PSRR performance at 80dB and is recommended where higher current headroom is beneficial without circuit redesign.

For Active Product Status with Extended Temperature Range: L7815ABV from STMicroelectronics provides 1.5A output current, active product status, and maintains the full -40°C to 125°C operating range. This part is suitable for applications requiring higher current capacity and extended low-temperature operation.

For Cost-Optimized Active Alternatives: L7815ACV and L7815CV from STMicroelectronics provide 1.5A output current with active product status and RoHS3 compliance. Operating temperature range is limited to 0°C to 125°C. These parts are suitable for commercial temperature range applications.

For Matched Current Capacity with RoHS3 Compliance: L78M15ABV maintains 500mA output current matching the original specification with RoHS3 compliance and full temperature range (-40°C to 125°C), though product status is obsolete.

For Higher Current Applications: L78S15CV provides 2A output current with extended operating temperature to 150°C, suitable for applications requiring significantly higher current capacity. Product status is obsolete.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current than the LM341T-15? A: Yes. Parts rated for 1A, 1.5A, or 2A output current are electrically compatible substitutes for the 500mA LM341T-15 in applications where the circuit design accommodates the higher current capability. The fixed 15V output voltage and TO-220-3 package remain identical.

Q: What is the difference between LM341T-15 and LM341T-15/NOPB? A: LM341T-15/NOPB is the active product equivalent from Texas Instruments with identical electrical specifications. The primary differences are active product status, RoHS3 compliance, and packaging designation (NOPB indicates no lead-free plating). Both maintain 500mA output current and 15V fixed output.

Q: Are all substitute parts pin-compatible with the LM341T-15? A: Yes. All listed substitute parts use the TO-220-3 package with identical pin configuration, enabling direct board-level replacement without circuit modifications.

Q: Which substitute part has the best noise performance? A: MC7815ABTG and MC7815ACTG from onsemi provide the highest PSRR at 80dB (120Hz), compared to 69dB for the original LM341T-15. L7815ABV provides 58dB PSRR.

Q: Can I use a substitute part with a narrower operating temperature range? A: Substitution depends on your application requirements. L7815ACV, L7815CV, MC7815ACTG, and L78M15CV operate from 0°C to 125°C, which is narrower than the original -40°C to 125°C range. These parts are suitable only for commercial temperature range applications.

Q: What is the difference between L78M15ABV and L7815ABV? A: Both provide 15V fixed output in TO-220-3 packaging. L78M15ABV is rated for 500mA output current (matching the original LM341T-15), while L7815ABV is rated for 1.5A. L7815ABV has active product status; L78M15ABV is obsolete.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts are RoHS3 compliant. The original LM341T-15 is RoHS non-compliant. RoHS3 compliance is required for new designs in regulated markets.

Q: Which substitute offers the best inventory availability? A: L7815CV has the highest inventory at 25,100 pieces, followed by MC7815ABTG at 24,809 pieces. Both are active products with RoHS3 compliance.

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