LM397MF Equivalent & Substitute Parts

Part Overview

The LM397MF is a general-purpose comparator IC manufactured by Texas Instruments, featuring open-collector, rail-to-rail output in a SOT-23-5 surface mount package. This device operates across a wide supply voltage range of 5V to 30V (single supply) or ±2.5V to ±15V (dual supply), making it suitable for precision voltage comparison applications in industrial and consumer electronics.

The LM397MF currently holds Last Time Buy status, indicating it is being phased out. Identifying equivalent and substitute parts is essential for design continuity, long-term component availability, and production planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM397MF
Manufacturer	Texas Instruments
Category	Linear
Type	General Purpose Comparator
Number of Elements	1
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	5V ~ 30V, ±2.5V ~ 15V
Voltage - Input Offset (Max)	7mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	13mA @ 5V
Current - Quiescent (Max)	2mA
Operating Temperature	-40°C ~ 85°C
Package / Case	SC-74A, SOT-753
Mounting Type	Surface Mount
Supplier Device Package	SOT-23-5
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM397MF are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Single/Dual supply voltage range compatibility: 5V ~ 30V (single) or ±2.5V ~ 15V (dual)
Output type: Open-Collector or equivalent output configuration
Input offset voltage: Maximum 7mV @ 30V
Input bias current: Maximum 0.25µA @ 5V
Output current capability: Minimum 13mA @ 5V
Quiescent current: Maximum 2mA
Operating temperature range: Minimum -40°C ~ 85°C
Package: SOT-23-5 surface mount
Compliance: ROHS3, REACH Unaffected

Grouping Logic:

Group 1 - Direct Parametric Equivalents (Texas Instruments): LM397MF/NOPB and LM397MFX/NOPB are identical to the main part in all electrical specifications and packaging. These parts differ only in packaging format (Cut Tape vs. Digi-Reel) and product status (Active vs. Last Time Buy). Both maintain full compatibility with existing designs.

Group 2 - Manufacturer Recommended Alternatives: MIC6270YM5-TR (Microchip), TA75S393F,LF (Toshiba), and TS391RILT (STMicroelectronics) meet the core electrical requirements within the specified parameter ranges. These parts operate within compatible supply voltage ranges, maintain equivalent input offset and bias current specifications, and provide comparable output current capabilities. All are housed in SOT-23-5 packages and comply with RoHS3 and REACH requirements.

Group 3 - Extended Range Alternative: NCS2202SN1T1G (onsemi) operates at lower supply voltages (0.85V ~ 6V) and includes additional performance specifications (CMRR, PSRR, propagation delay, hysteresis). This part is suitable for applications requiring lower supply voltages but may not be appropriate for designs requiring the full 5V ~ 30V range of the LM397MF.

Parameter Comparison

Parameter	LM397MF	LM397MF/NOPB	LM397MFX/NOPB	MIC6270YM5-TR	TA75S393F,LF	TS391RILT	NCS2202SN1T1G
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology	Toshiba Semiconductor	STMicroelectronics	onsemi
Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Elements	1	1	1	1	1	1	1
Output Type	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, TTL	Open-Drain, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	5V ~ 30V, ±2.5V ~ 15V	5V ~ 30V, ±2.5V ~ 15V	5V ~ 30V, ±2.5V ~ 15V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	0.85V ~ 6V
Voltage - Input Offset (Max)	7mV @ 30V	7mV @ 30V	7mV @ 30V	5mV @ 5V	5mV @ 5V	5mV @ 30V	5mV @ 6V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.05µA @ 5V	0.25µA @ 5V	1pA @ 6V
Current - Output (Typ)	13mA @ 5V	13mA @ 5V	13mA @ 5V	20mA @ 5V	16mA @ 5V	16mA @ 5V	—
Current - Quiescent (Max)	2mA	2mA	2mA	1.2mA	800µA	1.25mA	17µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Recommended Priority):

LM397MF/NOPB and LM397MFX/NOPB are the preferred substitutes. Both are manufactured by Texas Instruments and maintain identical electrical specifications to the LM397MF. The primary distinction is product status: both alternatives are Active, ensuring long-term availability and supply chain stability. These parts are suitable for immediate drop-in replacement in existing designs without circuit modification.

For Alternative Sourcing:

MIC6270YM5-TR, TA75S393F,LF, and TS391RILT are manufacturer-recommended alternatives that meet all core electrical requirements within the specified parameter ranges. All three parts are Active products with ROHS3 compliance and REACH Unaffected status. TS391RILT offers an extended operating temperature range (-40°C ~ 125°C), providing additional thermal margin for demanding applications. These alternatives are suitable when primary substitutes are unavailable.

For Extended Supply Voltage Range Applications:

NCS2202SN1T1G is suitable only for applications operating within the 0.85V ~ 6V supply range. This part is not recommended as a substitute for designs requiring the full 5V ~ 30V supply voltage capability of the LM397MF.

Frequently Asked Questions (FAQ)

Q: Can LM397MF/NOPB and LM397MFX/NOPB be used interchangeably with LM397MF?

A: Yes. Both parts are electrically and mechanically identical to LM397MF. The differences are packaging format (Cut Tape vs. Digi-Reel) and product status (Active vs. Last Time Buy). No circuit modifications are required.

Q: What is the primary reason to substitute the LM397MF?

A: The LM397MF is designated Last Time Buy, indicating Texas Instruments is discontinuing this part. Substitution ensures design continuity and long-term component availability.

Q: Are the Microchip, Toshiba, and STMicroelectronics alternatives pin-compatible with LM397MF?

A: Yes. MIC6270YM5-TR, TA75S393F,LF, and TS391RILT all use the SOT-23-5 package with identical pinout. All are surface mount devices suitable for direct PCB replacement.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Supply voltage range (5V ~ 30V single or ±2.5V ~ ±15V dual), output type (open-collector), input offset voltage (≤7mV @ 30V), input bias current (≤0.25µA @ 5V), output current (≥13mA @ 5V), and quiescent current (≤2mA) are the primary criteria.

Q: Is NCS2202SN1T1G suitable for all LM397MF applications?

A: No. NCS2202SN1T1G operates at 0.85V ~ 6V supply voltage, which does not cover the full 5V ~ 30V range of LM397MF. This part is suitable only for low-voltage applications within its specified range.

Q: Do all substitute parts comply with RoHS3 and REACH requirements?

A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, matching the compliance status of LM397MF.

Q: Which substitute offers the widest operating temperature range?

A: TS391RILT operates from -40°C ~ 125°C, providing 40°C additional upper temperature margin compared to LM397MF (-40°C ~ 85°C).

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