LM2937IMP-5.0 Equivalent & Substitute Parts

Part Overview

The LM2937IMP-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output power management component. This device delivers 500mA output current in a SOT-223-4 surface mount package and operates across an input voltage range of up to 26V. The main part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2937IMP-5.0
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	1V @ 500mA
Package Type	SOT-223-4
Operating Temperature	-40°C ~ 85°C
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2937IMP-5.0 is determined by the following critical parameters:

Output voltage fixed at 5V
Output current capability of 500mA or greater
Maximum input voltage of 26V or higher
Surface mount packaging (SOT-223 series)
Operating temperature range compatibility
RoHS3 compliance

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents: Parts from Texas Instruments with identical electrical specifications and packaging, differing only in product status or tape/reel configuration.

Parametric Equivalents: Parts from the same manufacturer meeting all electrical and mechanical requirements with active product status.

Manufacturer-Recommended Alternatives: Parts from other manufacturers (Analog Devices, Microchip Technology) that meet or exceed the electrical specifications of the main part while maintaining compatibility with the SOT-223 package footprint.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Operating Temp	Product Status
LM2937IMP-5.0	Texas Instruments	500mA	26V	1V @ 500mA	SOT-223-4	-40°C ~ 85°C	Last Time Buy
LM2937IMP-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	SOT-223-4	-40°C ~ 85°C	Active
LM2937IMPX-5.0/NOPB	Texas Instruments	500mA	26V	1V @ 500mA	SOT-223-4	-40°C ~ 85°C	Active
LT1129CST-5#PBF	Analog Devices Inc.	700mA	30V	0.7V @ 700mA	SOT-223-3	0°C ~ 125°C	Active
LT1129CST-5#TRPBF	Analog Devices Inc.	700mA	30V	0.7V @ 700mA	SOT-223-3	0°C ~ 125°C	Active
LT1129IST-5#PBF	Analog Devices Inc.	700mA	30V	0.7V @ 700mA	SOT-223-3	-40°C ~ 125°C	Active
LT1129IST-5#TRPBF	Analog Devices Inc.	700mA	30V	0.7V @ 700mA	SOT-223-3	-40°C ~ 125°C	Active
MCP1804T-5002I/DB	Microchip Technology	150mA	28V	1.3V @ 100mA	SOT-223-3	-40°C ~ 85°C	Active
MIC2920A-5.0WS	Microchip Technology	400mA	26V	0.75V @ 400mA	SOT-223-3	-40°C ~ 125°C	Active
MIC2954-02WS	Microchip Technology	250mA	30V	0.6V @ 250mA	SOT-223-3	-40°C ~ 125°C	Active
MIC2954-02WS-TR	Microchip Technology	250mA	30V	0.6V @ 250mA	SOT-223-3	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

LM2937IMP-5.0/NOPB and LM2937IMPX-5.0/NOPB are the preferred substitutes. Both are Texas Instruments products with identical electrical specifications and active product status. These parts maintain full compatibility with existing designs and PCB layouts. Inventory availability is significantly higher than the main part (71,766 and 35,100 units respectively).

Secondary Substitutes (Higher Current Capability):

LT1129IST-5#TRPBF from Analog Devices Inc. provides enhanced performance with 700mA output current, lower dropout voltage (0.7V), and extended operating temperature range (-40°C ~ 125°C). This part is suitable for applications requiring higher current delivery or wider temperature operation. The SOT-223-3 package requires PCB layout verification for pin compatibility.

Application-Specific Alternatives:

MIC2920A-5.0WS from Microchip Technology delivers 400mA output current with 0.75V dropout voltage and extended temperature range (-40°C ~ 125°C). This part is appropriate for designs where the full 500mA capability is not required but enhanced thermal performance is beneficial.

MCP1804T-5002I/DB is suitable only for applications requiring 150mA or less output current. This part is not recommended as a general substitute due to significantly reduced current capacity.

All substitute parts maintain RoHS3 compliance and are available in active product status.

Frequently Asked Questions (FAQ)

Q: Can LM2937IMP-5.0/NOPB be used as a direct replacement for LM2937IMP-5.0?

A: Yes. LM2937IMP-5.0/NOPB is electrically and mechanically identical to the main part. The only difference is product status (Active vs. Last Time Buy) and packaging configuration. Both use SOT-223-4 packages and deliver identical performance specifications.

Q: What is the difference between SOT-223-3 and SOT-223-4 packages?

A: SOT-223-4 includes four pins (GND, IN, OUT, NC), while SOT-223-3 uses three pins (GND, IN, OUT). PCB layouts designed for SOT-223-4 cannot directly accommodate SOT-223-3 parts without redesign. Pin-to-pin compatibility must be verified before substitution.

Q: Are Analog Devices LT1129 parts suitable replacements?

A: LT1129IST-5#TRPBF and LT1129CST-5#TRPBF exceed the electrical specifications of the LM2937IMP-5.0 with higher output current (700mA vs. 500mA) and lower dropout voltage (0.7V vs. 1V). However, the SOT-223-3 package requires PCB layout verification. These parts are suitable for new designs or redesigned layouts requiring enhanced performance.

Q: Which substitute has the lowest dropout voltage?

A: MIC2954-02WS and MIC2954-02WS-TR from Microchip Technology offer the lowest dropout voltage at 0.6V @ 250mA. However, output current is limited to 250mA, making these parts suitable only for lower-power applications.

Q: Can MCP1804T-5002I/DB replace the LM2937IMP-5.0?

A: No. MCP1804T-5002I/DB is limited to 150mA output current, which is insufficient for applications requiring the full 500mA capability of the LM2937IMP-5.0. This part is suitable only for designs with significantly reduced current requirements.

Q: What is the inventory status of substitute parts?

A: LM2937IMP-5.0/NOPB has the highest inventory (71,766 units), followed by LM2937IMPX-5.0/NOPB (35,100 units). Analog Devices LT1129 variants range from 2,075 to 4,429 units. Microchip Technology parts range from 1,320 to 3,700 units. Inventory levels should be verified with suppliers for current availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance, consistent with the main part specification.

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