LM2940S-8.0 Equivalent & Substitute Parts

Part Overview

The LM2940S-8.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output regulation at 8V with 1A output current capability. This device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support and procurement continuity. The LM2940S-8.0 operates in the TO-263 (DDPAK-3) surface mount package and provides integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection.

Substiute Parts

LM2940S-8.0

Texas InstrumentsIn Stock: 1295LM2940S-8.0 Datasheet

Current PartRFQ

LM2940S-8.0/NOPB

National SemiconductorIn Stock: 1391LM2940S-8.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2940S-8.0 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 8V
• Maximum input voltage of 26V
• Output current capability of 1A
• Maximum dropout voltage of 1V at 1A
• Quiescent current of 10 mA
• PSRR specification of 66dB at 120Hz
• Identical protection feature set (over-current, over-temperature, reverse polarity, short-circuit)
• Operating temperature range of -40°C to 125°C
• TO-263 (DDPAK-3) surface mount package configuration

The LM2940S-8.0/NOPB from National Semiconductor meets all specified electrical and mechanical parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The LM2940S-8.0/NOPB from National Semiconductor is the qualified substitute for the obsolete LM2940S-8.0 from Texas Instruments. Both devices are electrically and mechanically identical across all specified parameters. The primary distinction is product status: the original part is obsolete while the substitute maintains active production status, ensuring long-term availability and supply chain continuity.

Selection of the LM2940S-8.0/NOPB is appropriate for applications requiring direct replacement without circuit modification. The device maintains identical electrical performance, protection characteristics, and thermal operating range. Compliance certifications (ECCN: EAR99, HTSUS: 8542.39.0001) are consistent between both variants.

Frequently Asked Questions (FAQ)

Q: Can the LM2940S-8.0/NOPB be used as a direct replacement for the LM2940S-8.0?

A: Yes. Both devices are electrically and mechanically equivalent across all specified parameters including output voltage, current rating, dropout voltage, quiescent current, PSRR, protection features, operating temperature range, and TO-263 package configuration. No circuit modifications are required.

Q: What is the difference between the LM2940S-8.0 and LM2940S-8.0/NOPB?

A: The primary difference is manufacturer designation and product status. The LM2940S-8.0 is from Texas Instruments and is classified as obsolete. The LM2940S-8.0/NOPB is from National Semiconductor and maintains active production status. All electrical and mechanical specifications are identical.

Q: Are there any package compatibility considerations?

A: Both parts use the TO-263 (DDPAK-3) surface mount package with identical pinout and thermal characteristics. PCB layout and footprint remain unchanged during substitution.

Q: What protection features are included in both devices?

A: Both the LM2940S-8.0 and LM2940S-8.0/NOPB include over-current protection, over-temperature protection, reverse polarity protection, and short-circuit protection.

Q: Is the operating temperature range the same for both parts?

A: Yes. Both devices operate across the temperature range of -40°C to 125°C with identical thermal performance characteristics.