KA350 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The KA350 is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications requiring 3A current capacity in a TO-220-3 package. This device operates as a single-output positive adjustable regulator suitable for power management applications across industrial and commercial equipment.

The KA350 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA350
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	35V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	33V
Current - Output	3A
PSRR	80dB ~ 65dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the KA350 are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Package Compatibility: TO-220-3 form factor (identical mechanical footprint and pin configuration)
Output Configuration: Positive adjustable output
Electrical Specifications: Maximum input voltage 35V, adjustable output range 1.2V to 33V, 3A output current capacity
Functional Features: Single regulator with over-temperature and short-circuit protection
Mounting Type: Through-hole technology

The substitute parts identified—LM350AT/NOPB and LM350T/NOPB—meet all these criteria. Both are manufactured by Texas Instruments and maintain identical electrical performance specifications and package geometry as the KA350.

Parameter Comparison

Parameter	KA350 (onsemi)	LM350AT/NOPB (TI)	LM350T/NOPB (TI)
Package / Case	TO-220-3	TO-220-3	TO-220-3
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1
Voltage - Input (Max)	35V	35V	35V
Voltage - Output (Min/Fixed)	1.2V	1.25V	1.25V
Voltage - Output (Max)	33V	33V	33V
Current - Output	3A	3A	3A
PSRR	80dB ~ 65dB (120Hz)	86dB ~ 65dB (120Hz)	86dB ~ 65dB (120Hz)
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both LM350AT/NOPB and LM350T/NOPB are direct functional equivalents to the KA350 and are suitable for substitution in applications requiring positive adjustable linear regulation at 3A output current.

LM350T/NOPB is the preferred substitute for designs operating within the 0°C to 125°C temperature range, matching the KA350 operating temperature specification exactly. This part is actively manufactured and widely available, with RoHS3 compliance and REACH unaffected status.

LM350AT/NOPB extends the operating temperature range to -40°C to 125°C, providing additional thermal margin for applications requiring extended low-temperature operation. This variant is also actively manufactured and RoHS3 compliant.

Both substitute parts provide enhanced protection features (over-current protection in addition to over-temperature and short-circuit protection) and superior PSRR performance compared to the KA350, representing functional improvements while maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM350AT/NOPB and LM350T/NOPB be used interchangeably with KA350?

A: Yes. Both parts are direct substitutes. The primary difference is operating temperature range. LM350T/NOPB matches the KA350 temperature specification (0°C to 125°C), while LM350AT/NOPB extends to -40°C. Select based on your application's thermal requirements.

Q: Are there pin configuration differences between KA350 and the substitute parts?

A: No. All three parts use identical TO-220-3 package pinouts. Direct board-level substitution is possible without circuit modifications.

Q: What is the significance of the minimum output voltage difference (1.2V vs 1.25V)?

A: The KA350 supports adjustable output down to 1.2V, while LM350 variants support 1.25V minimum. For applications requiring output below 1.25V, the KA350 specification is more permissive. For standard applications, this 0.05V difference is not functionally significant.

Q: Do the substitute parts require different external component values?

A: No. The LM350 series maintains the same external resistor network requirements as the KA350 for output voltage adjustment. Existing circuit designs require no modification.

Q: What compliance certifications apply to the substitute parts?

A: Both LM350AT/NOPB and LM350T/NOPB are RoHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8542.39.0001, matching the KA350 regulatory status.

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