LM340S-5.0 Equivalent & Substitute Parts

Part Overview

The LM340S-5.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 5V output at 1.5A in a TO-263 (DDPAK-3) surface mount package. This device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and production sustainability.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM340S-5.0
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	35V
Dropout Voltage (Max)	2V @ 1A
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM340S-5.0 are classified based on the following substitution criteria:

Direct Manufacturer Equivalent: Parts with identical electrical specifications, output voltage, output current, input voltage rating, dropout voltage, package type, and mounting configuration. These parts maintain full functional and pin compatibility.

Manufacturer Recommended Equivalent: Parts recommended by the original manufacturer that meet the same electrical requirements but may differ in packaging format or product status. These provide validated alternatives from the same manufacturer.

Parametric Equivalent: Parts from the same manufacturer with matching electrical performance specifications and package compatibility, though they may carry different base product numbers.

Cross-Manufacturer Equivalent: Parts from alternative manufacturers meeting the same electrical and mechanical specifications, suitable for applications where multi-source qualification is acceptable.

The key parameters determining substitutability are: fixed output voltage (5V), output current capability (1.5A minimum), maximum input voltage (35V), package type (TO-263-3), and surface mount configuration.

Parameter Comparison

Parameter	LM340S-5.0	LM340S-5.0/NOPB	LM340SX-5.0	LM7805S/NOPB	BD50C0AFP2-CE2
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor
Output Voltage	5V	5V	5V	5V	5V
Output Current	1.5A	1.5A	1.5A	1.5A	1A
Input Voltage (Max)	35V	35V	35V	35V	26.5V
Dropout Voltage (Max)	2V @ 1A	2V @ 1A	2V @ 1A	2V @ 1A	0.5V @ 500mA
Quiescent Current	8 mA	8 mA	8 mA	8 mA	2.5 mA
PSRR	80dB (120Hz)	80dB (120Hz)	80dB (120Hz)	80dB (120Hz)	55dB (120Hz)
Package / Case	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Product Status	Last Time Buy	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

LM340S-5.0/NOPB (Direct Equivalent): This part is the primary substitute for the LM340S-5.0. It maintains identical electrical specifications, package configuration, and thermal characteristics. The primary advantage is Active product status with higher inventory availability (5300 pcs vs. 1400 pcs). This part is recommended for immediate design transitions due to supply continuity.

LM340SX-5.0 (Manufacturer Recommended): Texas Instruments designates this as a manufacturer-recommended equivalent. It provides identical electrical performance and package compatibility. Packaging format differs (Cut Tape & Digi-Reel vs. Tube), which may affect procurement workflows. Product status is Last Time Buy, similar to the original part.

LM7805S/NOPB (Parametric Equivalent): This part delivers equivalent electrical performance with Active product status and established supply chain presence. The base product number differs (LM7805 vs. LM340), but functional specifications are identical. This part is suitable for applications where manufacturer diversification within Texas Instruments' portfolio is acceptable.

BD50C0AFP2-CE2 (Cross-Manufacturer Equivalent): This Rohm Semiconductor part meets the core electrical requirements with notable differences: output current is reduced to 1A (vs. 1.5A), maximum input voltage is 26.5V (vs. 35V), and dropout voltage is superior at 0.5V @ 500mA. This part includes Enable control features and automotive-grade qualification (AEC-Q100). Selection requires verification that the 1A output current and 26.5V input limit are acceptable for the target application. Moisture sensitivity is superior (MSL 1 vs. MSL 3).

Frequently Asked Questions (FAQ)

Q: Can LM340S-5.0/NOPB be used as a direct replacement for LM340S-5.0?

A: Yes. Both parts are identical in electrical specifications, output voltage (5V), output current (1.5A), input voltage rating (35V), dropout voltage (2V @ 1A), package type (TO-263-4, D2PAK), and mounting configuration (Surface Mount). The primary difference is product status: LM340S-5.0/NOPB is Active, while LM340S-5.0 is Last Time Buy. No circuit modifications are required.

Q: What is the difference between LM340SX-5.0 and LM340S-5.0?

A: Electrical specifications are identical. The primary differences are packaging format (Cut Tape & Digi-Reel vs. Tube) and product status (both Last Time Buy). The "X" designation indicates a different packaging option. Pin configuration and functional performance remain unchanged.

Q: Can BD50C0AFP2-CE2 replace LM340S-5.0 in all applications?

A: BD50C0AFP2-CE2 is a parametric equivalent with the same 5V output and TO-263 package. However, it has reduced output current (1A vs. 1.5A) and lower maximum input voltage (26.5V vs. 35V). Applications requiring the full 1.5A output or input voltages above 26.5V must use Texas Instruments parts. The Rohm device is suitable only for applications within its electrical limits.

Q: Why does LM7805S/NOPB have a different base product number?

A: LM7805S/NOPB and LM340S-5.0 are both 5V linear regulators from Texas Instruments with identical electrical performance. The different base numbers (LM7805 vs. LM340) reflect different product lines within the same manufacturer. Both are functionally equivalent for 5V regulation applications.

Q: What does "Last Time Buy" status mean for the LM340S-5.0?

A: Last Time Buy indicates the manufacturer will discontinue this part number. Existing inventory will be sold until depletion, after which the part will no longer be available. Designs should transition to Active status alternatives such as LM340S-5.0/NOPB or LM7805S/NOPB to ensure long-term supply continuity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts, including LM340S-5.0/NOPB, LM340SX-5.0, LM7805S/NOPB, and BD50C0AFP2-CE2, are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: What is the advantage of BD50C0AFP2-CE2 regarding moisture sensitivity?

A: BD50C0AFP2-CE2 has Moisture Sensitivity Level 1 (Unlimited), compared to MSL 3 (168 Hours) for Texas Instruments parts. This means the Rohm device can be stored indefinitely without baking, while Texas Instruments parts require baking after 168 hours of exposure to ambient humidity. For high-volume or long-lead-time applications, this provides handling and storage advantages.

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