LM3940IMP-3.3In StockTexas Instruments
LM3940IMP-3.3 is a 1A low-dropout linear voltage regulator by Texas Instruments, designed to regulate input voltages as low as 1V above the output. Key specs: 3.3V fixed output, 1A output current, low dropout voltage of 0.5V typical. From $0.88, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Price
- From $0.8788(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1A Output Current: Delivers up to 1A of continuous output current, suitable for powering microcontrollers and logic circuits
- Low Dropout Voltage: Typical dropout of only 0.5V at full load, enabling efficient regulation from low supply voltages
- Fixed 3.3V Output: Precise 3.3V regulated output ideal for modern digital systems and communication interfaces
- SOT-223 Package: Compact surface-mount package with excellent thermal dissipation for space-constrained designs
- Stable with Ceramic Capacitors: Compatible with low-ESR ceramic output capacitors for simplified PCB design
Applications
The LM3940IMP-3.3 is widely used in embedded systems and IoT devices where a stable 3.3V rail must be derived from a 5V supply. It is ideal for powering microcontrollers, FPGAs, wireless modules, and sensor interfaces in consumer electronics, industrial control, and communication equipment. Its low dropout characteristic also makes it suitable for battery-powered applications where supply voltage margin is tight.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the output voltage and maximum output current of the LM3940IMP-3.3?
The LM3940IMP-3.3 provides a fixed 3.3V regulated output with a maximum continuous output current of 1A. The typical dropout voltage at full 1A load is approximately 0.5V, meaning a minimum input voltage of around 3.8V is required for proper regulation.
What type of output capacitor is recommended for the LM3940IMP-3.3?
Texas Instruments recommends using a low-ESR output capacitor of at least 33µF for stable operation. The LM3940IMP-3.3 is specifically designed to be stable with ceramic capacitors, which simplifies PCB layout and reduces component count in modern designs.
What are the typical applications for the LM3940IMP-3.3?
The LM3940IMP-3.3 is commonly used to convert a 5V supply to 3.3V for powering microcontrollers, FPGAs, Bluetooth and Wi-Fi modules, sensors, and other 3.3V logic devices. It is also suitable for battery-powered devices requiring a stable low-voltage rail.
Is the LM3940IMP-3.3 available in other package options?
The LM3940IMP-3.3 is offered in the SOT-223 surface-mount package. Texas Instruments also offers the LM3940 series in TO-92 and TO-220 through-hole packages for different thermal and board space requirements, providing design flexibility across various applications.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $2.1600 | $2.16 |
| 3+ | $1.6200 | $4.86 |
| 41+ | $1.2500 | $51.25 |
| 161+ | $1.0000 | $161.00 |
| 220+ | $0.9131 | $200.88 |
| 285+ | $0.8788 | $250.46 |
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