LM2931T-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931T-5.0 is a linear voltage regulator IC from onsemi designed for positive fixed 5V output at 100mA in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM2931T-5.0 provides regulated 5V output with integrated over-current and over-temperature protection, suitable for applications requiring low-dropout regulation in through-hole configurations.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.6V @ 100mA
Quiescent Current	1 mA
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the LM2931T-5.0 is determined by the following critical parameters:

Output voltage specification (5V fixed)
Output current capability (minimum 100mA)
Input voltage rating (26V or higher)
Package type (TO-220-3 through-hole)
Voltage dropout characteristics
Operating temperature range compatibility
Protection feature set

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status, offering direct replacement capability.

Parametric Equivalents: Parts with matching core specifications but variations in secondary parameters such as quiescent current, PSRR, or protection features. These require application-level verification but maintain functional compatibility for the primary regulation function.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Load	Quiescent Current	Operating Temp	Product Status	RoHS Status
LM2931T-5.0	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	-40°C ~ 125°C	Obsolete	RoHS non-compliant
LM2931T-5.0G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2931AT-5.0G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2931AT-5.0/NOPB	National Semiconductor	5V	100mA	26V	0.3V @ 100mA	15 mA	-40°C ~ 85°C	Active	Not specified
LM2931T-5.0/NOPB	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL750L05CKCS	Texas Instruments	5V	150mA	26V	0.6V @ 150mA	2 mA	0°C ~ 125°C	Active	ROHS3 Compliant
TL750L05CKCSE3	Texas Instruments	5V	150mA	26V	0.6V @ 150mA	2 mA	0°C ~ 125°C	Active	ROHS3 Compliant
LM340AT-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	ROHS3 Compliant
LM340T-5.0/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	8 mA	0°C ~ 125°C	Active	ROHS3 Compliant
LM7805CT/NOPB	Texas Instruments	5V	1.5A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LM2931T-5.0G and LM2931AT-5.0G from onsemi are direct functional equivalents with active product status and ROHS3 compliance. These parts maintain the 100mA output current, 0.6V dropout at 100mA, and 1mA quiescent current of the original LM2931T-5.0. Selection between these variants depends on packaging requirements (tube packaging available for both).

For Active Product Status with Minor Parameter Variations:

LM2931T-5.0/NOPB from Texas Instruments provides active product status with ROHS3 compliance. This part maintains 100mA output current and 1mA quiescent current but features improved dropout voltage (0.3V @ 100mA) and operates within -40°C ~ 85°C temperature range. The reduced maximum operating temperature should be evaluated against application requirements.

For Higher Current Capability:

TL750L05CKCS and TL750L05CKCSE3 from Texas Instruments offer 150mA output current while maintaining 5V output and 26V maximum input voltage. These parts are suitable for applications requiring current headroom beyond 100mA. Operating temperature range is 0°C ~ 125°C.

For Higher Input Voltage and Current:

LM340AT-5.0/NOPB, LM340T-5.0/NOPB, and LM7805CT/NOPB support higher input voltages (35V maximum) and output currents (1.5A). These parts are appropriate for applications with higher power requirements but feature increased dropout voltage (2V @ 1A) and higher quiescent current. Operating temperature range is 0°C ~ 125°C.

All recommended substitutes maintain TO-220-3 through-hole packaging and positive fixed 5V output configuration.

Frequently Asked Questions (FAQ)

Q: Can LM2931T-5.0G directly replace the obsolete LM2931T-5.0?

A: Yes. LM2931T-5.0G maintains identical electrical specifications including 100mA output current, 0.6V dropout at 100mA, 1mA quiescent current, and -40°C ~ 125°C operating range. The primary difference is active product status and ROHS3 compliance. Tube packaging is available for both.

Q: What is the difference between LM2931T-5.0G and LM2931AT-5.0G?

A: Both parts are functionally equivalent with identical electrical specifications. The difference lies in the temperature grade designation (T vs. AT). Both support -40°C ~ 125°C operation and are available in tube packaging with ROHS3 compliance.

Q: Why would I select TL750L05CKCS over LM2931T-5.0G?

A: TL750L05CKCS provides 150mA output current compared to 100mA, offering additional current capacity for applications approaching the 100mA limit. Both maintain 5V output and 26V maximum input voltage. The trade-off is slightly higher quiescent current (2mA vs. 1mA) and reduced minimum operating temperature (0°C vs. -40°C).

Q: Are LM340 series parts compatible with LM2931T-5.0 applications?

A: LM340 series parts (LM340AT-5.0/NOPB, LM340T-5.0/NOPB, LM7805CT/NOPB) maintain 5V output and TO-220-3 packaging but differ significantly in output current (1.5A vs. 100mA), input voltage rating (35V vs. 26V), and dropout voltage (2V @ 1A vs. 0.6V @ 100mA). These parts are suitable only for applications requiring higher current capacity and can tolerate increased dropout voltage.

Q: What packaging options are available for substitute parts?

A: All substitute parts listed maintain TO-220-3 through-hole package configuration. Packaging variants (tube, bulk) are specified for each part number. Verify packaging availability with your supplier for production requirements.

Q: Which substitute part offers the best compliance profile?

A: LM2931T-5.0G, LM2931AT-5.0G, LM2931T-5.0/NOPB, TL750L05CKCS, TL750L05CKCSE3, LM340AT-5.0/NOPB, LM340T-5.0/NOPB, and LM7805CT/NOPB all carry ROHS3 compliance. The original LM2931T-5.0 is RoHS non-compliant. Selection should prioritize ROHS3-compliant alternatives for new designs.

Q: Can I use LM2931AT-5.0/NOPB from National Semiconductor as a substitute?

A: LM2931AT-5.0/NOPB maintains 5V output and 100mA current but features improved dropout voltage (0.3V vs. 0.6V) and higher quiescent current (15mA vs. 1mA). The maximum operating temperature is reduced to -40°C ~ 85°C. Application-level verification is required for temperature range and quiescent current impact.

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