LM337BT Linear Voltage Regulator IC Negative Adjustable 1.5A TO-220

Part Overview

The LM337BT is a linear voltage regulator IC manufactured by onsemi, designed for negative adjustable output applications with 1.5A current capability in a TO-220-3 package. This component is classified as obsolete, which necessitates identification of active alternative models that maintain electrical and mechanical compatibility. The LM337BT provides negative voltage regulation with adjustable output ranging from -1.2V to -37V, making it suitable for dual-supply and negative rail applications in analog and mixed-signal circuits.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Output Configuration	Negative
Output Type	Adjustable
Voltage - Input (Max)	-40V
Voltage - Output (Min/Fixed)	-1.2V
Voltage - Output (Max)	-37V
Current - Output	1.5A
Current - Quiescent (Iq)	6 mA
PSRR	77dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM337BT is determined by strict equivalence across the following critical parameters: negative output configuration, adjustable output type, output voltage range (-1.2V to -37V), 1.5A output current capability, TO-220-3 package, and through-hole mounting. All identified substitute parts maintain these core electrical and mechanical specifications. Substitutes are grouped into two categories: direct manufacturer equivalents (same base product number LM337 from onsemi) and cross-manufacturer alternatives (LM337 variants from Texas Instruments and STMicroelectronics). Product status and RoHS compliance differ among substitutes and are documented for design decision purposes.

Parameter Comparison

Parameter	LM337BT (onsemi)	LM337BTG (onsemi)	LM337KCSE3 (TI)	LM337SP (STMicroelectronics)	LM337T/NOPB (TI)
Product Status	Obsolete	Active	Last Time Buy	Active	Active
Output Configuration	Negative	Negative	Negative	Negative	Negative
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	-40V	-40V	-40V	40V	-40V
Voltage - Output (Min/Fixed)	-1.2V	-1.2V	-1.2V	-1.2V	-1.2V
Voltage - Output (Max)	-37V	-37V	-37V	-37V	-37V
Current - Output	1.5A	1.5A	1.5A	1.5A	1.5A
Current - Quiescent (Iq)	6 mA	6 mA	Not specified	Not specified	Not specified
PSRR	77dB (120Hz)	77dB (120Hz)	77dB (120Hz)	77dB ~ 60dB (120Hz)	77dB (120Hz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Temperature, Short Circuit	Over Current, Over Temperature	Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM337BTG (onsemi) is the primary direct substitute, maintaining identical electrical specifications and operating temperature range while offering active product status and ROHS3 compliance. This part is recommended for new designs and production transitions from the obsolete LM337BT.

LM337T/NOPB (Texas Instruments) provides an active alternative with equivalent electrical performance and ROHS3 compliance. This part is suitable for applications where cross-manufacturer sourcing is acceptable. Operating temperature range is limited to 0°C ~ 125°C compared to the LM337BT specification of -40°C ~ 125°C; verification against application requirements is necessary for low-temperature operation.

LM337SP (STMicroelectronics) is an active substitute with ROHS3 compliance. PSRR specification shows a range (77dB ~ 60dB) rather than a fixed value. Operating temperature range is 0°C ~ 125°C. This part is suitable for applications not requiring extended low-temperature operation below 0°C.

LM337KCSE3 (Texas Instruments) carries Last Time Buy status, indicating limited future availability. This part is not recommended for new designs but may be considered for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can LM337BTG directly replace LM337BT without circuit modification?

A: Yes. LM337BTG maintains identical electrical specifications, output voltage range, current capability, and TO-220-3 package configuration. Pin-to-pin compatibility is confirmed. No circuit modifications are required.

Q: What is the impact of operating temperature range differences in substitute parts?

A: LM337BT specifies -40°C ~ 125°C operation. LM337T/NOPB, LM337SP, and LM337KCSE3 specify 0°C ~ 125°C. Applications requiring operation below 0°C must use LM337BT or LM337BTG. For applications with minimum operating temperature at or above 0°C, all substitutes are acceptable.

Q: Are all substitute parts RoHS compliant?

A: LM337BTG, LM337KCSE3, LM337SP, and LM337T/NOPB are all ROHS3 compliant. The original LM337BT is RoHS non-compliant. Design transitions to compliant alternatives are recommended for new products.

Q: What protection features differ among the substitutes?

A: LM337BT, LM337BTG, and LM337SP provide Over Current and Over Temperature protection. LM337KCSE3 and LM337T/NOPB provide Over Temperature and Short Circuit protection. Both protection schemes are functionally adequate for negative voltage regulation applications.

Q: Is LM337SP suitable for all applications where LM337BT is used?

A: LM337SP is suitable for applications with operating temperatures between 0°C and 125°C. The PSRR specification range (77dB ~ 60dB) indicates variable performance across the frequency spectrum. Applications with stringent noise rejection requirements should verify PSRR performance at specific operating conditions.

Q: What is the inventory status of substitute parts?

A: LM337T/NOPB has the highest inventory (5242 pcs), followed by LM337SP (1750 pcs), LM337KCSE3 (1350 pcs), and LM337BTG (1269 pcs). LM337KCSE3 carries Last Time Buy status, indicating declining availability.

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