LM2940T-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2940T-5.0 is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 5V output at 1A current capacity in a TO-220-3 package. This device is classified as Last Time Buy status, indicating discontinued production with limited inventory availability. Identifying equivalent and substitute parts is necessary to ensure design continuity, support long-term production requirements, and maintain supply chain flexibility for applications requiring 5V regulation at 1A output or compatible current ratings.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2940T-5.0
Output Voltage	5V Fixed
Output Current	1A
Input Voltage (Max)	26V
Voltage Dropout (Max)	1V @ 1A
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Last Time Buy
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2940T-5.0 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 5V fixed
Output current capacity: 1A or greater
Input voltage maximum: 26V or greater
Package type: TO-220-3
Mounting type: Through Hole
Operating temperature range: -40°C to 125°C minimum

Substitution Categories:

Direct Equivalents (Texas Instruments): Parts with identical electrical specifications and through-hole TO-220-3 packaging, differing only in lead finish or RoHS compliance status.

Functional Equivalents (Microchip Technology): Parts with 5V fixed output, equal or greater current capacity, compatible input voltage ratings, and through-hole TO-220-3 packaging. These devices provide equivalent or superior performance characteristics.

Cross-Manufacturer Alternatives (onsemi): Parts meeting core voltage and current requirements with compatible packaging, though with different electrical characteristics such as dropout voltage and quiescent current.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Mounting	Product Status	RoHS Status
LM2940T-5.0	Texas Instruments	1A	26V	1V @ 1A	10 mA	TO-220-3	Through Hole	Last Time Buy	Non-Compliant
LM2940T-5.0/LF08	Texas Instruments	1A	26V	1V @ 1A	10 mA	TO-220-3 Formed Leads	Surface Mount	Active	ROHS3 Compliant
LM2940T-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	10 mA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MC7805ABTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC29150-5.0WT	Microchip Technology	1.5A	26V	0.6V @ 1.5A	Not Specified	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC2920A-5.0WT	Microchip Technology	400mA	26V	0.75V @ 400mA	300 µA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC29300-5.0WT	Microchip Technology	3A	26V	0.6V @ 3A	Not Specified	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC2937A-5.0WT	Microchip Technology	750mA	26V	Not Specified	300 µA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC2940A-5.0WT	Microchip Technology	1.25A	26V	0.6V @ 1.25A	500 µA	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC29500-5.0WT	Microchip Technology	5A	26V	0.6V @ 5A	Not Specified	TO-220-3	Through Hole	Active	ROHS3 Compliant
MIC2954-02WT	Microchip Technology	250mA	30V	0.6V @ 250mA	300 µA	TO-220-3	Through Hole	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for Immediate Substitution):

LM2940T-5.0/NOPB is the primary direct replacement. This part maintains identical electrical specifications, through-hole TO-220-3 packaging, and 1A output current. Product status is Active with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Inventory availability is 25,400 units.

Tier 2 - Texas Instruments Alternatives:

LM2940T-5.0/LF08 provides equivalent electrical performance with ROHS3 compliance and Active status. The primary difference is surface-mount formed leads on the TO-220-3 package, which may require PCB layout modification. Inventory is 3,687 units.

Tier 3 - Microchip Technology Functional Equivalents:

MIC2940A-5.0WT delivers 1.25A output capacity with superior dropout voltage (0.6V @ 1.25A versus 1V @ 1A), maintaining 26V maximum input voltage and through-hole TO-220-3 packaging. ROHS3 compliance and Active status support long-term production. This part is suitable for applications requiring marginal current headroom.

MIC29150-5.0WT provides 1.5A output capacity with 0.6V dropout voltage, offering increased current margin for designs with higher transient demands. ROHS3 compliant and Active status.

MIC29300-5.0WT and MIC29500-5.0WT are suitable for applications requiring 3A and 5A output capacity respectively, with superior dropout characteristics and full protection feature sets.

Tier 4 - Current-Limited Alternatives:

MIC2937A-5.0WT (750mA) and MIC2920A-5.0WT (400mA) are suitable only for applications with output current requirements below 1A. These parts are not recommended as direct replacements for 1A-rated designs.

Tier 5 - Cross-Manufacturer Alternative:

MC7805ABTG (onsemi) meets core voltage and current requirements with 35V maximum input voltage and ROHS3 compliance. Dropout voltage is 2V @ 1A (typical), which is higher than the LM2940T-5.0. This part is suitable for applications where higher dropout voltage is acceptable and onsemi supply chain preference exists.

MIC2954-02WT is limited to 250mA output and is not suitable for 1A applications.

Frequently Asked Questions (FAQ)

Q: Can LM2940T-5.0/NOPB be used as a direct drop-in replacement for LM2940T-5.0?

A: Yes. LM2940T-5.0/NOPB is electrically and mechanically identical to the original part, with identical through-hole TO-220-3 packaging, 1A output current, 5V fixed output, and -40°C to 125°C operating range. The primary difference is ROHS3 compliance status and Active product status, ensuring continued availability.

Q: What is the difference between LM2940T-5.0/LF08 and LM2940T-5.0/NOPB?

A: Both parts have identical electrical specifications. LM2940T-5.0/LF08 features surface-mount formed leads on the TO-220-3 package, requiring different PCB footprint design compared to standard through-hole leads. LM2940T-5.0/NOPB maintains standard through-hole configuration.

Q: Can Microchip MIC2940A-5.0WT replace the LM2940T-5.0 in all applications?

A: MIC2940A-5.0WT is functionally compatible with superior performance characteristics: 1.25A output capacity versus 1A, and 0.6V dropout voltage versus 1V. The part maintains 5V fixed output, 26V maximum input voltage, through-hole TO-220-3 packaging, and -40°C to 125°C operating range. It is suitable for all applications designed for LM2940T-5.0 and provides additional current margin.

Q: Is MC7805ABTG (onsemi) a suitable replacement?

A: MC7805ABTG meets core requirements: 5V fixed output, 1A output current, TO-220-3 package, and through-hole mounting. However, dropout voltage is 2V @ 1A (typical) compared to 1V @ 1A for the LM2940T-5.0. This higher dropout voltage may impact thermal performance in power-limited applications. Substitution is acceptable where dropout voltage specification is not critical.

Q: Why are MIC2920A-5.0WT and MIC2937A-5.0WT listed if they have lower current ratings?

A: These parts are included for reference and applications where output current requirements are below 1A. MIC2920A-5.0WT (400mA) and MIC2937A-5.0WT (750mA) are not suitable as direct replacements for 1A-rated designs but may be used in current-limited applications.

Q: What is the significance of RoHS compliance status in part selection?

A: RoHS3 compliance is required for new designs and long-term production in regulated markets. The original LM2940T-5.0 is RoHS non-compliant and Last Time Buy status. All recommended substitutes (LM2940T-5.0/NOPB, Microchip alternatives, and MC7805ABTG) are ROHS3 compliant, ensuring regulatory alignment and supply chain continuity.

Q: Can higher-current parts like MIC29300-5.0WT (3A) or MIC29500-5.0WT (5A) be used in place of the 1A-rated LM2940T-5.0?

A: Yes. Higher-current-rated parts are electrically compatible and provide additional current capacity margin. These parts maintain 5V fixed output, 26V maximum input voltage, through-hole TO-220-3 packaging, and -40°C to 125°C operating range. They are suitable for applications where future current scaling or design margin is required.

Q: What is the impact of quiescent current differences between substitute parts?

A: Quiescent current affects standby power consumption and thermal performance. The LM2940T-5.0 has 10 mA quiescent current. Microchip alternatives typically have lower quiescent current (300 µA to 500 µA), reducing standby power dissipation. MC7805ABTG has 6 mA quiescent current. Lower quiescent current is beneficial for battery-powered or low-power applications.

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