LM2940IMP-9.0 Equivalent & Substitute Parts

Part Overview

The LM2940IMP-9.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 1A output current at a fixed 9V output with a maximum dropout voltage of 1V. The device integrates protection features including over-current, over-temperature, reverse polarity, and short-circuit protection, making it suitable for regulated power supply applications in industrial and commercial equipment.

The LM2940IMP-9.0 carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently using this regulator.

Substiute Parts

LM2940IMP-9.0

Texas InstrumentsIn Stock: 1866LM2940IMP-9.0 Datasheet

Current PartRFQ

LM2940IMP-9.0/NOPB

Texas InstrumentsIn Stock: 3233LM2940IMP-9.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2940IMP-9.0 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 9V
• Output current capability of 1A
• Maximum input voltage of 26V
• Dropout voltage specification of 1V @ 1A
• SOT-223-4 package configuration
• Positive output configuration with fixed regulation
• Identical protection feature set (over-current, over-temperature, reverse polarity, short-circuit)
• Operating temperature range of -40°C to 85°C

The LM2940IMP-9.0/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The LM2940IMP-9.0/NOPB is the direct substitute for the obsolete LM2940IMP-9.0. Both parts share identical electrical specifications and package configuration. The primary distinction is product status: the LM2940IMP-9.0/NOPB maintains active production status with current availability.

The LM2940IMP-9.0/NOPB additionally carries ROHS3 compliance, whereas the original LM2940IMP-9.0 is RoHS non-compliant. This compliance improvement supports modern regulatory requirements without altering electrical or mechanical performance.

Both parts maintain equivalent REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring consistent export and supply chain handling.

Frequently Asked Questions (FAQ)

Q: Can the LM2940IMP-9.0/NOPB directly replace the LM2940IMP-9.0 in existing designs?

A: Yes. The LM2940IMP-9.0/NOPB is electrically and mechanically identical to the LM2940IMP-9.0. Both devices deliver 1A at 9V fixed output with identical dropout voltage, protection features, and SOT-223-4 package configuration. No design modifications are required.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates lead-free, RoHS3-compliant manufacturing. This reflects modern environmental and regulatory standards while maintaining full electrical equivalence to the original part.

Q: Are there any differences in thermal or electrical performance between these parts?

A: No. Both parts specify identical quiescent current (10 mA), supply current (15 mA maximum), PSRR (64dB at 120Hz), and operating temperature range (-40°C to 85°C). Thermal and electrical performance are equivalent.

Q: Why is the original LM2940IMP-9.0 marked as obsolete?

A: The LM2940IMP-9.0 has been superseded by the LM2940IMP-9.0/NOPB in Texas Instruments' product portfolio. The newer variant incorporates RoHS3 compliance while maintaining full functional equivalence.

Q: Is the SOT-223-4 package compatible with existing PCB layouts?

A: Yes. Both the LM2940IMP-9.0 and LM2940IMP-9.0/NOPB use the SOT-223-4 package (TO-261-4, TO-261AA case designation). PCB footprints and land patterns are identical, requiring no layout modifications.