The LM2937IMP-3.3/NOPB from Texas Instruments is a 500 mA, 3.3 V fixed low-dropout regulator designed for harsh automotive and industrial supplies. It accepts inputs up to 26 V with immunity to 60 V load-dump transients and reverse-battery or mirror-image insertion. Featuring a typical 0.5 V dropout and a trimmed ±5 % output tolerance, it remains stable with low-ESR ceramic output capacitors. Internal short-circuit and thermal-overload protection complete the device, housed in a 4-pin SOT-223 package across -40 °C to +125 °C.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM2937IMP-3.3/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LM2937 |
| Package / Case | SOT-223 (DCY) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to +125°C |
| Power Supply | Up to 26 V (input) |
| Output Current | 500 mA |
| Output Voltage | 3.3 V (Fixed) |
| Dropout Voltage | 0.5 V (typical) |
| Input Voltage | Up to 26 V |
| Output Tolerance | ±5% |
| Quiescent Current | 10 mA (typ., full load) |
| Protection | Thermal, short-circuit, reverse-battery |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- 500 mA output current with fixed 3.3 V output
- Survives 60 V load-dump and reverse-battery transients
- Typical 0.5 V dropout at full load
- Trimmed ±5 % output tolerance over all conditions
- Stable with low-ESR ceramic output capacitors
- Internal short-circuit and thermal-overload protection
- Mirror-image insertion protection
Applications
- Automotive body and engine electronics
- Industrial 24 V supply rails
- Post-regulation in switched-mode supplies
- Battery-powered equipment
- Microcontroller power supplies
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
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FAQ
What distinguishes the LM2937IMP-3.3/NOPB from other LM2937 packages?
This part is the 3.3 V fixed output in a 4-pin SOT-223 (IMP) surface-mount package, whereas the ET variant is TO-220 and the ES is TO-263, all sharing the same 500 mA regulator core.
What output capacitor does the LM2937 require for stability?
It remains stable with an output capacitor ESR below 3 Ω, allowing low-ESR ceramic or other chip capacitors rather than bulky tantalum types.
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