The Texas Instruments LM2940CT-12/NOPB is a fixed 12 V, 1 A low-dropout positive voltage regulator from the LM2940C family. Housed in a 3-pin TO-220 package, it delivers a typical dropout of just 0.5 V at full load across a 6 V to 26 V input range. Designed for automotive duty, it integrates reverse-battery, mirror-image and load-dump transient protection, and is specified for 0°C to 125°C operation.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM2940CT-12/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; 12 V fixed output |
| Output Voltage | 12 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 12 V output trimmed before assembly
- 1 A output with 0.5 V typical dropout at full load
- Reverse battery protection for automotive robustness
- Mirror-image insertion protection
- Internal short-circuit current limiting
- Quiescent current reduction circuit for battery-fed loads
- Load dump transient protection
Applications
- Automotive body electronics
- Battery-powered equipment
- Industrial control supplies
- Post-regulation of switched-mode supplies
- Consumer appliances
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
Quality
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FAQ
What is the difference between the LM2940CT-12/NOPB and the LM2940CT-5.0/NOPB?
Both are through-hole TO-220 LM2940C regulators with the same 1 A capability, but the CT-12 provides a fixed 12 V output while the CT-5.0 provides a fixed 5 V output.
What temperature range does the LM2940CT-12/NOPB support?
This LM2940C “CT” variant is specified for 0°C to 125°C, whereas the LM2940-N family (such as the LM2940IMP-12) is rated down to -40°C.
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