LM350TG Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM350TG is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 3A current capability in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM350TG operates with input voltage up to 35V and adjustable output from 1.2V to 33V, incorporating over-current and over-temperature protection features.

Substiute Parts

LM350TG

onsemiIn Stock: 2814LM350TG Datasheet

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NCP5663DSADJR4G

onsemiIn Stock: 1185NCP5663DSADJR4G Datasheet

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LM350AT/NOPB

Texas InstrumentsIn Stock: 2454LM350AT/NOPB Datasheet

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LM350T/NOPB

Texas InstrumentsIn Stock: 16638LM350T/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM350TG are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output Configuration: Positive
• Output Type: Adjustable
• Current - Output: 3A
• Voltage - Input (Max): 35V or greater
• Voltage - Output Range: Minimum 1.2V or lower, Maximum 33V or higher
• Protection Features: Over Current and Over Temperature minimum

Grouping Logic:

Group 1 - Direct Package Compatibility (TO-220-3): Parts maintaining the same through-hole TO-220-3 package allow direct board-level substitution without layout modifications. LM350AT/NOPB and LM350T/NOPB from Texas Instruments meet this criterion with identical electrical specifications and enhanced product status (Active).

Group 2 - Functional Equivalence with Package Variation (D2PAK-5): The NCP5663DSADJR4G provides functional equivalence with adjustable output and 3A capability but uses surface-mount D2PAK-5 packaging. This part requires PCB layout redesign but maintains electrical compatibility within specified voltage and current parameters.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Redesign):

LM350AT/NOPB and LM350T/NOPB from Texas Instruments are the primary substitutes for the obsolete LM350TG. Both parts maintain identical TO-220-3 through-hole packaging, enabling direct board-level substitution. Both are classified as Active products with ROHS3 compliance. LM350AT/NOPB supports extended operating temperature range (-40°C to 125°C) compared to LM350T/NOPB (0°C to 125°C), matching the LM350TG lower temperature limit. Both Texas Instruments parts provide enhanced short-circuit protection in addition to over-current and over-temperature protection.

For New Designs with PCB Layout Flexibility:

NCP5663DSADJR4G from onsemi offers an Active product status alternative with surface-mount D2PAK-5 packaging. This part is suitable for applications where input voltage does not exceed 9V and output voltage range is 0.9V to 7.7V. The NCP5663DSADJR4G features lower quiescent current (3 mA versus 10 mA) and includes an Enable control feature. This part requires PCB redesign and is not suitable for applications requiring the full 35V input capability of the LM350TG.

Compliance Considerations:

All three substitute parts carry ROHS3 compliance certification. The LM350TG product status as Obsolete necessitates transition to an Active product for long-term supply chain stability. Texas Instruments LM350 variants provide the most direct electrical and mechanical compatibility with the obsolete onsemi LM350TG.

Frequently Asked Questions (FAQ)

Q: Can LM350AT/NOPB or LM350T/NOPB be used as direct replacements for LM350TG without any modifications?

A: Yes. Both Texas Instruments parts use identical TO-220-3 through-hole packaging and maintain the same electrical specifications for output configuration, output type, voltage ranges, and current capability. No PCB modifications are required for direct substitution.

Q: What is the difference between LM350AT/NOPB and LM350T/NOPB?

A: The primary difference is operating temperature range. LM350AT/NOPB operates from -40°C to 125°C, while LM350T/NOPB operates from 0°C to 125°C. Both parts are otherwise electrically identical and use the same TO-220-3 package. Selection depends on application temperature requirements.

Q: Why is NCP5663DSADJR4G listed as a substitute if it has different voltage specifications?

A: NCP5663DSADJR4G is a functional equivalent for applications where input voltage does not exceed 9V and output voltage range is 0.9V to 7.7V. It shares the same 3A output current, adjustable output type, and positive output configuration. This part is suitable only for applications within its specified voltage envelope and requires PCB redesign due to D2PAK-5 surface-mount packaging.

Q: Can NCP5663DSADJR4G be used in applications requiring 35V input voltage?

A: No. NCP5663DSADJR4G has a maximum input voltage of 9V, making it unsuitable for applications requiring the full 35V input capability of the LM350TG. For high-voltage input applications, use LM350AT/NOPB or LM350T/NOPB.

Q: What are the package considerations when selecting a substitute?

A: LM350AT/NOPB and LM350T/NOPB maintain the through-hole TO-220-3 package, allowing direct board-level substitution without layout changes. NCP5663DSADJR4G uses surface-mount D2PAK-5 packaging, requiring PCB redesign and different assembly processes. Package selection depends on manufacturing capability and design flexibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. LM350AT/NOPB, LM350T/NOPB, and NCP5663DSADJR4G are all ROHS3 compliant. The original LM350TG does not specify RoHS status.

Q: Which substitute part has the lowest quiescent current?

A: NCP5663DSADJR4G has the lowest quiescent current at 3 mA, compared to 10 mA for the LM350TG. This lower quiescent current may be beneficial for battery-powered or low-power standby applications, provided the voltage and package requirements are met.