LM2937ES-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2937ES-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 500mA current capability in a TO-263 (DDPAK-3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator provides fixed output voltage regulation with integrated protection features including over temperature, short circuit, and transient voltage protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	500mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	1V @ 500mA
Quiescent Current	10 mA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-263 (DDPAK-3)
Output Configuration	Positive Fixed

Substitute Part Grouping Explanation

Substitute parts for the LM2937ES-2.5 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Fixed output voltage of 2.5V
Output current capability of 500mA minimum
Surface mount package compatibility (TO-263/DDPAK-3)
Operating temperature range of -40°C to 125°C
Positive output configuration

Acceptable Variation Parameters:

Input voltage maximum (26V for LM2937ES-2.5/NOPB; 6V for TC1262-2.5VEBTR)
Voltage dropout specifications (1V vs 0.65V)
Quiescent current (10mA vs 130µA)
Protection feature sets (as long as core protections are present)

The LM2937ES-2.5/NOPB from National Semiconductor is a direct equivalent with identical electrical specifications. The TC1262-2.5VEBTR from Microchip Technology is a functional substitute with improved performance characteristics in specific parameters, though with a lower maximum input voltage rating.

Parameter Comparison

Parameter	LM2937ES-2.5	LM2937ES-2.5/NOPB	TC1262-2.5VEBTR
Manufacturer	Texas Instruments	National Semiconductor	Microchip Technology
Output Voltage	2.5V	2.5V	2.5V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	26V	26V	6V
Voltage Dropout (Max)	1V @ 500mA	1V @ 500mA	0.65V @ 500mA
Quiescent Current	10 mA	10 mA	130 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LM2937ES-2.5/NOPB (National Semiconductor): This part is the direct functional equivalent with identical electrical specifications and package configuration. It is currently in active production status, making it the primary substitute for obsolete LM2937ES-2.5 units. This option is suitable for applications requiring exact parameter matching and is available in higher inventory quantities.

TC1262-2.5VEBTR (Microchip Technology): This part is a functional substitute suitable for applications where the maximum input voltage requirement does not exceed 6V. It offers improved performance in dropout voltage (0.65V vs 1V) and significantly lower quiescent current (130µA vs 10mA), making it advantageous for battery-powered or low-power applications. The TC1262-2.5VEBTR is ROHS3 compliant and carries MSL-1 moisture sensitivity rating, indicating superior handling characteristics compared to the original part. Selection of this substitute requires verification that the 6V input voltage maximum is compatible with the application's power supply specifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2937ES-2.5/NOPB be used as a direct replacement for the LM2937ES-2.5?

A: Yes. The LM2937ES-2.5/NOPB is a direct equivalent with identical output voltage (2.5V), output current (500mA), input voltage rating (26V maximum), dropout voltage (1V @ 500mA), and package configuration (TO-263 DDPAK-3). Pin-for-pin compatibility and electrical performance are identical.

Q: What are the key differences between the TC1262-2.5VEBTR and the original LM2937ES-2.5?

A: The TC1262-2.5VEBTR maintains the same output voltage (2.5V), output current (500mA), and package type (TO-263 DDPAK-3). However, it has a lower maximum input voltage (6V vs 26V), improved dropout voltage (0.65V vs 1V), and significantly lower quiescent current (130µA vs 10mA). The TC1262-2.5VEBTR is ROHS3 compliant and has superior moisture sensitivity rating (MSL-1).

Q: When should I use the TC1262-2.5VEBTR instead of the LM2937ES-2.5/NOPB?

A: Use the TC1262-2.5VEBTR when your application's input voltage does not exceed 6V and when lower quiescent current is beneficial for power efficiency. This substitute is particularly suitable for battery-powered designs and applications requiring RoHS3 compliance. Verify that your power supply specifications are compatible with the 6V maximum input voltage rating.

Q: Are all three parts pin-compatible in the TO-263 (DDPAK-3) package?

A: Yes. All three parts use the TO-263 (DDPAK-3) surface mount package with identical pinout configuration, allowing direct PCB-level substitution without layout modifications.

Q: What protection features are included in the substitute parts?

A: The LM2937ES-2.5/NOPB includes mirror-image insertion, over temperature, short circuit, and transient voltage protection. The TC1262-2.5VEBTR includes over current and over temperature protection. Both provide adequate protection for typical linear regulator applications.

Q: Is the TC1262-2.5VEBTR suitable for high-voltage input applications?

A: No. The TC1262-2.5VEBTR has a maximum input voltage rating of 6V, making it unsuitable for applications requiring input voltages above 6V. For applications requiring higher input voltage capability, use the LM2937ES-2.5/NOPB, which supports up to 26V input.

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