LM340T-5.0/LB01 Equivalent & Substitute Parts

Part Overview

The LM340T-5.0/LB01 is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed 5V positive output at 1A maximum current in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator features integrated over-temperature and short-circuit protection, suitable for general-purpose power management applications requiring stable 5V regulation from input sources up to 35V.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM340T-5.0/LB01
Output Voltage	5V Fixed
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout	2V @ 1A
Package	TO-220-3
Mounting Type	Through Hole
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LM340T-5.0/LB01 is determined by the following critical parameters: fixed 5V output voltage, TO-220-3 package configuration, through-hole mounting, positive output configuration, and compliance with ROHS3 standards. Substitute parts are grouped into three categories based on output current capability and product status:

Category 1: Direct Manufacturer Substitutes (Texas Instruments) Parts maintaining the same manufacturer and base product line with enhanced specifications or different packaging variants.

Category 2: Cross-Manufacturer Equivalents (Active Status) Parts from alternative manufacturers (STMicroelectronics, UMW, onsemi) offering identical or superior electrical performance with active product status.

Category 3: Current-Reduced Alternatives Parts with lower output current ratings suitable for applications not requiring full 1A capacity, offering improved quiescent current performance.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout	Operating Temp	Product Status	Package
LM340T-5.0/LB01	Texas Instruments	1A	35V	2V @ 1A	0°C ~ 125°C	Obsolete	TO-220-3
LM340T-5.0/LF01	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	Active	TO-220-3, Formed Leads
L7805ABV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	-40°C ~ 125°C	Active	TO-220-3
L7805ACV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	0°C ~ 125°C	Active	TO-220-3
L7805CV	UMW	1.2A	35V	Not Specified	-40°C ~ 105°C	Active	TO-220-3
L78M05ABV	STMicroelectronics	500mA	35V	Not Specified	-40°C ~ 125°C	Active	TO-220-3
L78M05CV	STMicroelectronics	500mA	35V	Not Specified	0°C ~ 150°C	Active	TO-220-3
L78S05CV	STMicroelectronics	2A	35V	Not Specified	0°C ~ 150°C	Obsolete	TO-220-3
LM2931AT-5.0G	onsemi	100mA	26V	0.6V @ 100mA	-40°C ~ 125°C	Active	TO-220-3
LM2931T-5.0G	onsemi	100mA	26V	0.6V @ 100mA	-40°C ~ 125°C	Active	TO-220-3
MC7805ABTG	onsemi	1A	35V	2V @ 1A (Typ)	-40°C ~ 125°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

LM340T-5.0/LF01 from Texas Instruments serves as the direct successor within the same manufacturer's product line. This part maintains identical electrical specifications while offering increased output current capability (1.5A) and active product status, ensuring long-term availability and supply chain stability.

MC7805ABTG from onsemi provides equivalent 1A output current with identical input voltage range and dropout characteristics. This part is actively manufactured and offers extended operating temperature range (-40°C to 125°C), providing superior thermal performance compared to the original part's 0°C to 125°C specification.

Secondary Substitutes (Suitable for Current-Compatible Applications)

L7805ACV and L7805ABV from STMicroelectronics both deliver 1.5A output current in TO-220-3 packages with active product status. L7805ABV extends the lower operating temperature to -40°C, while L7805ACV maintains the original 0°C lower limit. Both parts are ROHS3 compliant with unlimited moisture sensitivity rating.

L7805CV from UMW provides 1.2A output current, meeting or exceeding the original 1A specification. This part maintains 35V maximum input voltage and is actively produced with extended temperature range to 105°C.

Current-Reduced Alternatives (For Lower-Current Applications)

L78M05ABV and L78M05CV from STMicroelectronics are suitable only for applications requiring 500mA or less. These parts offer improved quiescent current (6mA) and enhanced protection features including over-current detection. L78M05CV extends operating temperature to 150°C.

LM2931AT-5.0G and LM2931T-5.0G from onsemi are restricted to 100mA applications and feature significantly lower quiescent current (1mA) and dropout voltage (0.6V @ 100mA). These parts are suitable only for low-power 5V regulation circuits.

Obsolete Status Consideration

L78S05CV from STMicroelectronics, despite offering 2A output current, carries obsolete product status and should not be selected for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LM340T-5.0/LF01 directly replace LM340T-5.0/LB01?

A: Yes. Both parts are manufactured by Texas Instruments with identical 5V fixed output, 35V maximum input, and TO-220-3 package. LM340T-5.0/LF01 offers higher output current (1.5A vs 1A) and active product status, making it a superior direct replacement.

Q: What is the difference between L7805ACV and L7805ABV?

A: Both parts deliver 1.5A output current and are manufactured by STMicroelectronics. The primary difference is operating temperature range: L7805ABV operates from -40°C to 125°C, while L7805ACV operates from 0°C to 125°C. Select L7805ABV for applications requiring extended low-temperature performance.

Q: Can I use MC7805ABTG as a substitute?

A: Yes. MC7805ABTG from onsemi provides identical 1A output current, 35V input voltage, and 2V dropout specification. It maintains TO-220-3 package compatibility and offers extended operating temperature range (-40°C to 125°C). This part is actively manufactured and ROHS3 compliant.

Q: Are L78M05 series parts suitable replacements?

A: No, not for applications requiring 1A output. L78M05ABV and L78M05CV are rated for 500mA maximum output current, which is insufficient for the original part's 1A specification. These parts are suitable only for circuits designed for 500mA or lower current requirements.

Q: What about LM2931 series regulators?

A: LM2931AT-5.0G and LM2931T-5.0G are not suitable direct replacements. These parts are limited to 100mA output current and 26V maximum input voltage, both significantly below the original part's specifications. They are appropriate only for low-power 5V regulation applications.

Q: Is the TO-220-3 package consistent across all substitutes?

A: Yes. All listed substitute parts use TO-220-3 package configuration with through-hole mounting, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the LM340T-5.0/LB01.

Q: Which substitute offers the best long-term availability?

A: LM340T-5.0/LF01 from Texas Instruments and MC7805ABTG from onsemi both carry active product status with substantial inventory levels, ensuring reliable long-term supply. Both are ROHS3 compliant and suitable for new design implementations.

Q: Can I use higher-current rated parts like L78S05CV?

A: L78S05CV offers 2A output current but carries obsolete product status. While electrically compatible, its obsolete classification makes it unsuitable for designs requiring supply chain continuity. Select active-status alternatives such as LM340T-5.0/LF01 or MC7805ABTG instead.

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