LM340LAH-5.0/NOPB Equivalent & Substitute Parts

Part Overview

The LM340LAH-5.0/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed 5V positive output at 100mA. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The part operates across a 0°C to 70°C temperature range and is housed in a TO-39-3 metal can package suitable for through-hole mounting applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM340LAH-5.0/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC REG LINEAR 5V 100MA TO39-3
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	35V
Current - Output	100mA
Voltage Dropout (Max)	2V @ 1A
Operating Temperature	0°C ~ 70°C
Package / Case	TO-205AD, TO-39-3 Metal Can
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM340LAH-5.0/NOPB is determined by the following critical parameters:

Output voltage specification: 5V fixed
Output current capability: minimum 100mA
Package type: TO-39-3 metal can (through-hole mounting)
Input voltage rating: 35V maximum
Output configuration: positive fixed regulator
Protection features: over-current and short-circuit protection

Substitute parts must maintain electrical compatibility across these parameters while accommodating variations in quiescent current, PSRR performance, and operating temperature ranges. Parts with higher current ratings (500mA) remain functionally compatible for applications requiring the 100mA specification, as they operate within the same voltage and package constraints.

Parameter Comparison

Parameter	LM340LAH-5.0/NOPB	LM140LAH-5.0/NOPB	SG7805AT-DESC	SG7805T-JAN
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology
Output Voltage (Fixed)	5V	5V	5V	5V
Current - Output	100mA	100mA	500mA	500mA
Voltage - Input (Max)	35V	35V	35V	35V
Voltage Dropout (Max)	2V @ 1A	2V @ 1A	2.5V @ 500mA	2.5V @ 500mA
Operating Temperature	0°C ~ 70°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	TO-205AD, TO-39-3 Metal Can	TO-205AD, TO-39-3 Metal Can	TO-205AD, TO-39-3 Metal Can	TO-205AD, TO-39-3 Metal Can
Product Status	Obsolete	Active	Active	Active
Protection Features	Over Current, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The LM140LAH-5.0/NOPB represents the primary direct substitute for the obsolete LM340LAH-5.0/NOPB. Both parts are manufactured by Texas Instruments, share identical electrical specifications for output voltage and current, maintain the same TO-39-3 package configuration, and are ROHS3 compliant. The LM140LAH-5.0/NOPB is currently in active production status with higher inventory availability (1445 pcs vs. 687 pcs).

The SG7805AT-DESC and SG7805T-JAN, manufactured by Microchip Technology, serve as functional alternatives for applications where higher output current capacity (500mA) is acceptable. Both Microchip devices maintain the 5V fixed output, 35V maximum input voltage, and TO-39-3 package format. The SG7805T-JAN carries MIL-STD-883 qualification and JAN grade designation, suitable for military-grade applications. Both Microchip alternatives provide extended operating temperature ranges (-55°C to 125°C) compared to the original part specification.

Frequently Asked Questions (FAQ)

Q: Can the LM140LAH-5.0/NOPB directly replace the LM340LAH-5.0/NOPB?

A: Yes. The LM140LAH-5.0/NOPB is a direct electrical and mechanical equivalent. Both parts provide 5V fixed output at 100mA, use identical TO-39-3 packaging, and maintain the same 35V maximum input voltage specification. The primary difference is product status: LM140LAH-5.0/NOPB is active production while LM340LAH-5.0/NOPB is obsolete.

Q: Are the Microchip SG7805 variants compatible with the original LM340LAH-5.0/NOPB?

A: The SG7805AT-DESC and SG7805T-JAN are functionally compatible for applications requiring 5V fixed output regulation. Both maintain the same package type (TO-39-3), input voltage rating (35V), and output voltage (5V). The primary difference is output current capacity: Microchip parts provide 500mA versus the original 100mA specification. Applications designed for 100mA operation will function correctly with these higher-capacity alternatives.

Q: What are the key differences between the substitute parts?

A: LM140LAH-5.0/NOPB matches the original 100mA output current specification and operating temperature range of 0°C to 70°C. SG7805AT-DESC and SG7805T-JAN both provide 500mA output current and extended operating temperature range (-55°C to 125°C). SG7805T-JAN includes MIL-STD-883 qualification for military applications.

Q: Does package compatibility affect substitution?

A: All substitute parts use the TO-39-3 metal can package with through-hole mounting configuration, identical to the original LM340LAH-5.0/NOPB. No PCB layout modifications are required for mechanical compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. The LM140LAH-5.0/NOPB, SG7805AT-DESC, and SG7805T-JAN are all ROHS3 compliant, matching the environmental compliance status of the original part.

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