LM2931AT-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931AT-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 LM2931AT-5.0 provides low-dropout regulation with integrated over-current and over-temperature protection, suitable for applications requiring stable 5V power delivery in through-hole configurations.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Dropout Voltage (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 LM2931AT-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)
Dropout voltage performance
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 meeting or exceeding the core electrical requirements with minor variations in secondary parameters such as quiescent current, PSRR, or protection features. These parts are functionally compatible but may have different performance characteristics.

Parameter Comparison

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

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LM2931AT-5.0G and LM2931T-5.0G from onsemi are direct functional equivalents with active product status and ROHS3 compliance. These parts maintain identical electrical performance while offering improved regulatory compliance compared to the obsolete original part.

For Active Designs Requiring Low-Dropout Performance:

LM2931T-5.0/NOPB from Texas Instruments provides equivalent 100mA output current with improved dropout voltage (0.3V vs 0.6V) and active product status. This part is suitable for applications where lower dropout performance is beneficial.

For Applications Requiring Higher Output Current:

TL750L05CKCS and TL750L05CKCSE3 from Texas Instruments deliver 150mA output current in the same TO-220-3 package, providing headroom for designs with marginal current requirements. These parts maintain the 26V input rating and 0.6V dropout specification.

For Higher Input Voltage or Current Applications:

LM340AT-5.0/NOPB, LM340T-5.0/NOPB, and LM7805CT/NOPB support higher input voltages (35V) and output currents (1.5A), suitable for applications requiring greater power delivery capability. These parts have higher dropout voltage specifications and should be evaluated for thermal performance in the target application.

Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance certification. The original LM2931AT-5.0 is RoHS non-compliant; migration to compliant alternatives is necessary for new designs subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can LM2931AT-5.0G directly replace LM2931AT-5.0 in existing designs?

A: Yes. LM2931AT-5.0G maintains identical electrical specifications including 100mA output current, 5V fixed output, 26V maximum input voltage, and TO-220-3 package. The primary difference is active product status and ROHS3 compliance.

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

A: Both parts are onsemi LM2931 variants with identical electrical specifications. The designation difference reflects internal manufacturing or packaging variations. Both are active and ROHS3 compliant.

Q: Why do some substitutes have lower dropout voltage (0.3V vs 0.6V)?

A: Dropout voltage varies by manufacturer design. Lower dropout voltage improves efficiency and reduces heat dissipation in power-limited applications. Parts with 0.3V dropout (LM2931T-5.0/NOPB) are suitable for designs where this performance is beneficial.

Q: Can I use TL750L05CKCS as a substitute if my design only requires 100mA?

A: Yes. TL750L05CKCS provides 150mA output current, exceeding the 100mA requirement. The part maintains 26V input rating and 0.6V dropout voltage. Higher current capability does not degrade performance in lower-current applications.

Q: Are LM340 series parts suitable replacements?

A: LM340AT-5.0/NOPB, LM340T-5.0/NOPB, and LM7805CT/NOPB are functionally compatible for 5V regulation but have different electrical characteristics: higher output current (1.5A), higher input voltage rating (35V), and higher dropout voltage (2V @ 1A). These parts are suitable for applications requiring higher power delivery but may require thermal management evaluation due to increased dropout voltage.

Q: What is the operating temperature difference between parts?

A: The original LM2931AT-5.0 operates from -40°C to 125°C. Some substitutes (LM2931AT-5.0/NOPB, LM2931T-5.0/NOPB) operate from -40°C to 85°C, reducing the upper temperature limit by 40°C. TL750L05 series and LM340 series operate from 0°C to 125°C, eliminating the -40°C lower limit. Verify temperature range compatibility with your application requirements.

Q: Are all recommended substitutes available in tube packaging?

A: LM2931AT-5.0G, LM2931T-5.0G, LM2931T-5.0/NOPB, TL750L05CKCS, TL750L05CKCSE3, LM340AT-5.0/NOPB, LM340T-5.0/NOPB, and LM7805CT/NOPB are available in tube packaging. The original LM2931AT-5.0 was available in bulk packaging.

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