LM2937ES-8.0 Equivalent & Substitute Parts

Part Overview

The LM2937ES-8.0 is a linear voltage regulator IC from Texas Instruments, designed for positive fixed 8V output applications with 500mA current capacity in a TO-263 (DDPAK-3) surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The regulator incorporates integrated protection features including mirror-image insertion protection, over-temperature shutdown, short-circuit protection, and transient voltage suppression, making it suitable for applications requiring robust power management in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2937ES-8.0
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC REG LIN 8V 500MA DDPAK/TO263
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	8V
Voltage - Input (Max)	26V
Voltage Dropout (Max)	1V @ 500mA
Current - Output	500mA
Current - Quiescent (Iq)	10 mA
Current - Supply (Max)	20 mA
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type	Surface Mount
Protection Features	Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the LM2937ES-8.0 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 8V
Positive output configuration
Minimum 500mA output current capability
Maximum input voltage of 26V or greater
Maximum dropout voltage of 1V or less at 500mA
TO-263 (DDPAK-3) surface mount package
Operating temperature range of -40°C to 125°C or wider
Integrated protection features: mirror-image insertion, over-temperature, short-circuit, and transient voltage protection

The LM2937ES-8.0/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications.

Parameter Comparison

Parameter	LM2937ES-8.0	LM2937ES-8.0/NOPB
Manufacturer	Texas Instruments	National Semiconductor
Output Voltage (Fixed)	8V	8V
Output Configuration	Positive	Positive
Output Current	500mA	500mA
Input Voltage (Max)	26V	26V
Dropout Voltage (Max)	1V @ 500mA	1V @ 500mA
Quiescent Current	10 mA	10 mA
Supply Current (Max)	20 mA	20 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount	Surface Mount
Protection Features	Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage	Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage
Product Status	Obsolete	Active

Engineering Selection Recommendations

The LM2937ES-8.0/NOPB is a direct functional equivalent to the LM2937ES-8.0. The primary distinction is product status: the original part is obsolete while the substitute maintains active status with National Semiconductor. Both parts share identical electrical specifications, package configuration, and protection feature sets.

For new designs or production continuity where the LM2937ES-8.0 is no longer available, the LM2937ES-8.0/NOPB provides complete electrical and mechanical compatibility. The NOPB designation indicates lead-free (no-lead) plating, which aligns with modern manufacturing standards.

Note that the original LM2937ES-8.0 carries RoHS non-compliant status, while compliance information for the substitute is not provided in the available data. Verify RoHS and REACH compliance requirements against your specific application and regional regulations before final component selection.

Frequently Asked Questions (FAQ)

Q: Can the LM2937ES-8.0/NOPB be used as a direct replacement for the LM2937ES-8.0?

A: Yes. Both parts deliver identical electrical performance: 8V fixed output, 500mA current capacity, 1V maximum dropout at rated current, and -40°C to 125°C operating range. Package and pinout are identical (TO-263 DDPAK-3). The substitute is functionally interchangeable.

Q: What does the NOPB suffix mean?

A: NOPB indicates no-lead plating or lead-free termination. This is a manufacturing designation that does not affect electrical performance or pin compatibility.

Q: Are there any compliance differences between the two parts?

A: The original LM2937ES-8.0 is marked as RoHS non-compliant. Compliance status for the LM2937ES-8.0/NOPB is not specified in available documentation. Confirm compliance requirements for your application before selection.

Q: Is the TO-263 package the same across both parts?

A: Yes. Both parts use the TO-263-4 (D2PAK with 3 leads plus tab) surface mount package. PCB footprint and thermal characteristics are identical.

Q: What protection features are included in both parts?

A: Both the LM2937ES-8.0 and LM2937ES-8.0/NOPB include mirror-image insertion protection, over-temperature shutdown, short-circuit protection, and transient voltage suppression.

Q: Can I use these parts in applications requiring higher output current?

A: No. Both parts are rated for maximum 500mA output current. Applications requiring higher current capacity require a different regulator design.

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