LM350T Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM350T is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, designed for applications requiring 3A output current with adjustable voltage output from 1.25V to 33V. The device is packaged in TO-220-3 and features integrated protection against overcurrent, overtemperature, and short circuit conditions.

The LM350T carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM350T
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Max)	35V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	33V
Current - Output	3A
PSRR	86dB ~ 65dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the LM350T is determined by the following critical parameters:

Primary Substitution Criteria:

Output configuration (Positive)
Output type (Adjustable)
Package type (TO-220-3)
Mounting type (Through Hole)
Protection features (Over Current, Over Temperature, Short Circuit)
RoHS3 compliance

Secondary Compatibility Factors:

Output current rating (minimum 3A required for direct replacement)
Input voltage rating (minimum 35V required)
Output voltage range (minimum 1.25V to 33V)
Operating temperature range

The LM350T/NOPB is a direct equivalent from Texas Instruments with identical electrical specifications and active product status. The LM317BTG and LM317TG from onsemi are manufacturer-recommended alternatives that operate on the same adjustable regulator architecture but with reduced output current (1.5A) and modified voltage specifications, requiring circuit design evaluation for applications demanding the full 3A output capability.

Parameter Comparison

Parameter	LM350T	LM350T/NOPB	LM317BTG	LM317TG
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
Product Status	Last Time Buy	Active	Active	Active
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	35V	35V	40V	40V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.2V	1.2V
Voltage - Output (Max)	33V	33V	37V	37V
Current - Output	3A	3A	1.5A	1.5A
PSRR	86dB ~ 65dB (120Hz)	86dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Recommended for Immediate Substitution):

LM350T/NOPB is the preferred substitute. This part maintains identical electrical specifications, the same TO-220-3 package, and active product status from Texas Instruments. No circuit modifications are required. This option provides the highest compatibility and design continuity.

Alternative Substitution (Requires Circuit Evaluation):

LM317BTG and LM317TG are manufacturer-recommended alternatives from onsemi. Both parts share the same adjustable regulator architecture and TO-220-3 package. However, the output current is reduced to 1.5A compared to the LM350T's 3A rating. These alternatives are suitable only for applications where the maximum required output current does not exceed 1.5A. The LM317BTG supports an extended operating temperature range (-40°C to 125°C) compared to the LM350T (0°C to 125°C), which may be advantageous for industrial applications. Both LM317 variants maintain ROHS3 compliance and include identical protection features.

All substitute parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LM350T/NOPB be used as a direct drop-in replacement for LM350T?

A: Yes. LM350T/NOPB is electrically and mechanically identical to LM350T. Both parts share the same TO-220-3 package, output current rating (3A), voltage specifications, and protection features. No circuit modifications are required.

Q: What is the key difference between LM350T and LM317BTG/LM317TG?

A: The primary difference is output current capability. LM350T delivers 3A maximum output current, while LM317BTG and LM317TG are rated for 1.5A maximum output current. Additionally, LM317 variants support a higher maximum input voltage (40V versus 35V) and extended output voltage range (1.2V to 37V versus 1.25V to 33V). These differences require circuit evaluation to determine suitability for specific applications.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. LM350T/NOPB, LM317BTG, and LM317TG are all packaged in TO-220-3, ensuring mechanical compatibility with existing PCB layouts and thermal management designs.

Q: Do the substitute parts include the same protection features as LM350T?

A: Yes. All substitute parts include overcurrent, overtemperature, and short circuit protection, matching the LM350T's protection feature set.

Q: Which substitute part should be selected for new designs?

A: For applications requiring 3A output current, select LM350T/NOPB. For applications with maximum output current requirements of 1.5A or less, LM317BTG or LM317TG are acceptable alternatives. Consider the extended temperature range of LM317BTG (-40°C to 125°C) for industrial or automotive applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LM350T/NOPB, LM317BTG, and LM317TG all carry ROHS3 compliance certification, meeting regulatory requirements for electronic component manufacturing and distribution.

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