KA337 Linear Voltage Regulator IC - Equivalent & Substitute Parts

Part Overview

The KA337 is a linear voltage regulator IC manufactured by onsemi, designed for negative adjustable output applications with 1.5A current capacity in TO-220-3 packaging. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The KA337 provides negative voltage regulation with adjustable output ranging from -1.2V to -37V, suitable for applications requiring stable negative power supplies.

Substiute Parts

KA337

onsemiIn Stock: 1314KA337 Datasheet

Current PartRFQ

LM337BTG

onsemiIn Stock: 1298LM337BTG Datasheet

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LM337TG

onsemiIn Stock: 25319LM337TG Datasheet

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LM337KCSE3

Texas InstrumentsIn Stock: 1382LM337KCSE3 Datasheet

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LM337SP

STMicroelectronicsIn Stock: 1840LM337SP Datasheet

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LM337T/NOPB

Texas InstrumentsIn Stock: 5343LM337T/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KA337 are qualified based on the following critical parameters that must match or exceed the original specification:

• Output Configuration: Negative (all substitutes maintain negative output)
• Output Type: Adjustable (all substitutes provide adjustable output)
• Voltage - Input (Max): -40V (all substitutes support this maximum input)
• Voltage - Output Range: -1.2V to -37V (all substitutes cover this range)
• Current - Output: 1.5A (all substitutes deliver this current capacity)
• Package / Case: TO-220-3 (all substitutes use compatible TO-220 packaging)
• Mounting Type: Through Hole (all substitutes maintain through-hole mounting)

All identified substitutes are functionally equivalent linear voltage regulator ICs from established manufacturers (onsemi, Texas Instruments, STMicroelectronics) with active or last-time-buy product status, ensuring design compatibility and electrical performance equivalence to the KA337.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete KA337, the following substitutes are recommended based on product status and compliance:

Primary Recommendations (Active Status):

• LM337TG (onsemi): Active product with highest inventory availability (25,300 pcs), identical electrical specifications, ROHS3 compliant, operating temperature range 0°C ~ 125°C
• LM337T/NOPB (Texas Instruments): Active product with substantial inventory (5,242 pcs), ROHS3 compliant, identical electrical specifications and operating temperature range
• LM337SP (STMicroelectronics): Active product with 1,750 pcs inventory, ROHS3 compliant, identical electrical specifications

Secondary Recommendation (Last Time Buy Status):

• LM337KCSE3 (Texas Instruments): Last time buy status with 1,350 pcs inventory, ROHS3 compliant, suitable for designs requiring extended production runs before transition to active alternatives

Extended Temperature Range Option:

• LM337BTG (onsemi): Active product with extended operating temperature range (-40°C ~ 125°C), ROHS3 compliant, suitable for applications requiring lower temperature operation

All recommended substitutes maintain electrical equivalence to the KA337 across critical parameters: negative adjustable output, 1.5A current capacity, -40V maximum input, -1.2V to -37V output range, and TO-220-3 packaging. Selection should prioritize active-status parts (LM337TG, LM337T/NOPB, LM337SP) for new designs to ensure long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can LM337BTG replace KA337 in all applications? A: Yes. LM337BTG is electrically equivalent to KA337 across all critical parameters: negative adjustable output, 1.5A current capacity, -40V maximum input, and -1.2V to -37V output range. Both use TO-220-3 packaging. LM337BTG offers extended operating temperature range (-40°C ~ 125°C) compared to KA337 (0°C ~ 125°C).

Q: What is the difference between LM337TG and LM337T/NOPB? A: Both are functionally equivalent with identical electrical specifications. LM337TG is manufactured by onsemi with 25,300 pcs inventory. LM337T/NOPB is manufactured by Texas Instruments with 5,242 pcs inventory. Both are active products, ROHS3 compliant, and use TO-220-3 packaging.

Q: Why is LM337KCSE3 marked as "Last Time Buy"? A: Last time buy status indicates the manufacturer has announced end-of-life for this product. LM337KCSE3 remains available with 1,350 pcs inventory but should not be selected for new long-term production designs. Use active alternatives (LM337TG, LM337T/NOPB, or LM337SP) for designs requiring extended production support.

Q: Are all substitutes ROHS3 compliant? A: Yes. All identified substitutes (LM337BTG, LM337TG, LM337KCSE3, LM337SP, LM337T/NOPB) are ROHS3 compliant. The original KA337 does not specify RoHS status.

Q: Does package compatibility affect substitution? A: No. All substitutes use TO-220-3 packaging, which is mechanically and electrically compatible with KA337. Through-hole mounting is maintained across all alternatives.

Q: Which substitute has the best PSRR performance? A: LM337BTG, LM337TG, LM337KCSE3, and LM337T/NOPB all provide 77dB PSRR at 120Hz, exceeding the KA337 specification of 60dB. LM337SP provides 77dB ~ 60dB PSRR range.

Q: Can I use LM337SP if my design requires -40V input? A: LM337SP specifies maximum input voltage as 40V (positive), which differs from the standard -40V (negative) specification of other substitutes. Verify application requirements before selection.