KA350TU Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The KA350TU 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 functions as a positive adjustable voltage regulator with a single output, capable of delivering regulated voltage from 1.2V to 33V across an input range up to 35V. The KA350TU is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production requirements.

Substiute Parts

KA350TU

onsemiIn Stock: 989KA350TU 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 KA350TU are identified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Output Configuration: Positive
• Output Type: Adjustable
• Number of Regulators: 1
• Voltage - Input (Max): 35V
• Voltage - Output (Max): 33V
• Current - Output: 3A
• Package / Case: TO-220-3
• Mounting Type: Through Hole

The substitute parts LM350AT/NOPB and LM350T/NOPB, both manufactured by Texas Instruments, meet all critical electrical specifications and package requirements. Both devices maintain the same TO-220-3 through-hole package, identical maximum input voltage (35V), identical maximum output voltage (33V), and identical output current rating (3A). The primary distinction between substitutes relates to operating temperature range and product status (both are active), making them suitable replacements for the obsolete KA350TU.

Parameter Comparison

Engineering Selection Recommendations

Both LM350AT/NOPB and LM350T/NOPB are active products from Texas Instruments and represent direct functional equivalents to the obsolete KA350TU. Selection between the two Texas Instruments substitutes depends on operating temperature requirements:

LM350T/NOPB is the preferred substitute when the application operates within the 0°C to 125°C temperature range, matching the original KA350TU operating temperature specification. This part maintains full electrical equivalence with identical PSRR performance and enhanced protection features including over-current protection.

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 offers the same electrical performance and protection features as the LM350T/NOPB.

Both substitutes provide ROHS3 compliance and maintain REACH unaffected status, supporting modern regulatory requirements. The Texas Instruments LM350 series devices include over-current protection in addition to the over-temperature and short-circuit protection present in the original KA350TU, enhancing circuit reliability.

Frequently Asked Questions (FAQ)

Q: Can LM350AT/NOPB and LM350T/NOPB be used interchangeably with KA350TU?

A: Yes, both Texas Instruments parts are direct functional substitutes. They share identical electrical specifications for voltage regulation (1.25V to 33V output, 35V maximum input, 3A output current) and the same TO-220-3 package. The primary difference is operating temperature range: LM350T/NOPB matches the original 0°C to 125°C range, while LM350AT/NOPB extends to -40°C.

Q: What are the key differences between the substitute parts?

A: LM350AT/NOPB and LM350T/NOPB differ only in operating temperature specification. LM350AT/NOPB operates from -40°C to 125°C, while LM350T/NOPB operates from 0°C to 125°C. All other electrical parameters, package type, and protection features are identical.

Q: Are there any compatibility concerns when replacing KA350TU with LM350 series regulators?

A: No compatibility concerns exist for direct replacement. Both substitute parts use the same TO-220-3 through-hole package with identical pinout and electrical characteristics. The minimum output voltage differs slightly (1.25V versus 1.2V), which is negligible for most adjustable regulator applications using external resistor networks.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both LM350AT/NOPB and LM350T/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The original KA350TU does not specify RoHS compliance due to its obsolete status.

Q: What additional protection features do the substitute parts provide?

A: The Texas Instruments LM350 series includes over-current protection in addition to over-temperature and short-circuit protection found in the KA350TU. This enhanced protection improves circuit reliability and fault tolerance.

Q: Which substitute should be selected for new designs?

A: For new designs operating within 0°C to 125°C, LM350T/NOPB is the standard choice. For applications requiring extended low-temperature operation below 0°C, LM350AT/NOPB provides the necessary thermal range. Both are active products with full manufacturer support.