The Texas Instruments LM2940CT-5.0/NOPB is a fixed 5 V, 1 A low-dropout positive regulator in the LM2940C family. Supplied in a through-hole TO-220 package, it regulates a 6 V to 26 V input to a trimmed 5 V output with a typical dropout of 0.5 V at 1 A. A quiescent-current reduction circuit plus reverse-battery and short-circuit protection make it well suited to battery-fed and automotive systems over 0°C to 125°C.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM2940CT-5.0/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LM2940 |
| Package / Case | TO-220 (NDE), 3-pin |
| Mounting Type | Through Hole |
| Operating Temperature | 0°C to 125°C |
| Power Supply | 6 V to 26 V input; 5 V fixed output |
| Output Voltage | 5 V (fixed) |
| Output Current | 1 A |
| Dropout Voltage | 0.5 V typ / 1 V max at 1 A |
| Input Voltage Range | 6 V to 26 V |
| Operating Temperature | 0°C to 125°C |
| Protection | Reverse battery, short-circuit, thermal overload |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- Fixed 5 V output trimmed before assembly
- 1 A output with 0.5 V typical dropout at full load
- Reverse battery protection
- Mirror-image insertion protection
- Internal short-circuit current limiting
- Quiescent current reduction circuit
Applications
- 5 V logic and microcontroller rails
- Automotive electronics
- Industrial controls
- Battery-powered instruments
- Post-regulation stages
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
Quality
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FAQ
How does the LM2940CT-5.0/NOPB differ from the LM2940S-5.0/NOPB?
Both deliver 5 V at 1 A, but the CT-5.0 is a through-hole TO-220 part rated 0°C to 125°C, while the S-5.0 is the surface-mount TO-263 version rated -40°C to 125°C.
Can the LM2940CT-5.0/NOPB be used with a 12 V input?
Yes, it accepts a 6 V to 26 V input and drops to a regulated 5 V with only 0.5 V typical dropout at 1 A.
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