LM2931AT-5.0 Equivalent & Substitute Parts

Part Overview

The LM2931AT-5.0 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 5V output at 100mA in a TO-220-3 package. This device operates as a positive fixed output regulator with integrated protection features including over-temperature, reverse polarity, and short-circuit protection. The part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Alternative models provide comparable or enhanced functionality across different manufacturers and performance specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2931AT-5.0
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Voltage	5V Fixed
Output Current	100mA
Input Voltage (Max)	26V
Dropout Voltage	0.3V @ 100mA
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM2931AT-5.0 are classified based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Output voltage: 5V fixed
Output current capability: 100mA minimum
Package type: TO-220-3 through-hole mounting
Input voltage rating: 26V or higher
Protection features: Over-temperature and short-circuit protection
RoHS3 compliance

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and packaging. These parts are pin-compatible and require no circuit modifications.

Parametric Equivalents meet all functional requirements but may have minor variations in quiescent current, PSRR, or dropout voltage. These are suitable for applications where the LM2931AT-5.0 specifications are not at design limits.

Higher-Current Alternatives provide 500mA to 1A output capability in the same TO-220-3 package. These are suitable when the application requires additional current headroom or future design margin.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	Packaging
LM2931AT-5.0	Texas Instruments	100mA	0.3V @ 100mA	15mA	80dB	-40°C ~ 85°C	Last Time Buy	Tube
LM2931AT-5.0/NOPB	National Semiconductor	100mA	0.3V @ 100mA	15mA	80dB	-40°C ~ 85°C	Active	Bulk
LM2931T-5.0/NOPB	Texas Instruments	100mA	0.3V @ 100mA	1mA	55dB	-40°C ~ 85°C	Active	Tube
LM2931AT-5.0G	onsemi	100mA	0.6V @ 100mA	1mA	90dB	-40°C ~ 125°C	Active	Tube
LM2931T-5.0G	onsemi	100mA	0.6V @ 100mA	1mA	90dB	-40°C ~ 125°C	Active	Tube
MC7805ABTG	onsemi	1A	2V @ 1A (Typ)	6mA	83dB	-40°C ~ 125°C	Active	Tube
MC7805ACTG	onsemi	1A	2V @ 1A (Typ)	6mA	83dB	0°C ~ 125°C	Active	Tube
MC7805BTG	onsemi	1A	2V @ 1A (Typ)	8mA	68dB	-40°C ~ 125°C	Active	Tube
MC7805CTG	onsemi	1A	2V @ 1A (Typ)	6.5mA	83dB	0°C ~ 125°C	Active	Tube
MC78M05ACTG	onsemi	500mA	Not Specified	Not Specified	80dB	0°C ~ 125°C	Obsolete	Tube
MC78M05BTG	onsemi	500mA	Not Specified	Not Specified	80dB	-40°C ~ 125°C	Active	Tube

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required):

LM2931AT-5.0/NOPB and LM2931T-5.0/NOPB are the primary direct substitutes. Both maintain the LM2931 base product number and identical 100mA output specification. LM2931AT-5.0/NOPB is currently in Active status with bulk packaging availability. LM2931T-5.0/NOPB offers improved quiescent current performance (1mA vs. 15mA) and is available in tube packaging, making it suitable for applications prioritizing low standby power consumption.

For Enhanced Performance and Extended Temperature Range:

LM2931AT-5.0G and LM2931T-5.0G from onsemi provide extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C) and improved PSRR (90dB vs. 80dB). These parts are Active status and suitable for industrial and automotive applications requiring wider temperature operation. The 0.6V dropout voltage is higher than the original specification but remains acceptable for most 5V regulation applications.

For Higher Current Applications:

MC7805 series regulators (MC7805ABTG, MC7805BTG, MC7805CTG) deliver 1A output current in the same TO-220-3 package. These are suitable when the application requires current headroom beyond 100mA. MC7805BTG has the highest inventory availability (175,400 pcs) and operates across the full -40°C to 125°C temperature range.

For Mid-Range Current Requirements:

MC78M05BTG provides 500mA output in Active status with -40°C to 125°C operating range. This option bridges the gap between 100mA and 1A output specifications.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status. Parts in Active status (LM2931AT-5.0/NOPB, LM2931T-5.0/NOPB, LM2931AT-5.0G, LM2931T-5.0G, MC7805 series, MC78M05BTG) are preferred for new designs. MC78M05ACTG is Obsolete and should not be selected for new applications.

Frequently Asked Questions (FAQ)

Q: Can I use MC7805BTG as a direct replacement for LM2931AT-5.0?

A: MC7805BTG is pin-compatible in TO-220-3 packaging and provides 5V output, but delivers 1A instead of 100mA. It is suitable for applications where the circuit can tolerate higher current capability. The 2V dropout voltage at 1A is higher than the LM2931AT-5.0 specification (0.3V @ 100mA), which may affect performance in low-input-voltage applications. Verify that your input voltage and load requirements are compatible before substitution.

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

A: Both are LM2931 base products with identical 100mA output and 5V fixed output voltage. The primary differences are quiescent current (15mA vs. 1mA) and PSRR (80dB vs. 55dB). LM2931T-5.0/NOPB is preferred for battery-powered or low-power applications where quiescent current is critical. The lower PSRR may be a consideration in noise-sensitive analog circuits.

Q: Are onsemi LM2931 variants (LM2931AT-5.0G, LM2931T-5.0G) fully compatible?

A: Yes, both onsemi variants maintain the LM2931 base product number and identical electrical specifications for output voltage and current. They offer extended operating temperature range (-40°C to 125°C) and improved PSRR (90dB). The 0.6V dropout voltage is higher than the original 0.3V specification. These parts are suitable for industrial and automotive applications requiring wider temperature operation.

Q: Why is MC78M05ACTG listed as Obsolete?

A: MC78M05ACTG is marked Obsolete by the manufacturer and should not be selected for new designs. Use MC78M05BTG (Active status) as the alternative for 500mA output requirements.

Q: What packaging differences exist between substitute parts?

A: The original LM2931AT-5.0 is supplied in Tube packaging. LM2931AT-5.0/NOPB is available in Bulk packaging. All other substitutes are supplied in Tube packaging. Packaging affects handling, storage, and minimum order quantities but does not impact electrical performance or pin compatibility.

Q: Can I use a higher-current regulator (MC7805) in a circuit designed for 100mA?

A: Yes. Higher-current regulators are backward-compatible in applications designed for lower current. The circuit will operate normally, and the regulator will supply only the current demanded by the load. However, verify that the higher dropout voltage and different quiescent current specifications do not affect your circuit performance, particularly in low-input-voltage or noise-sensitive applications.

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