Specifications
| Type | Description |
|---|---|
| Part Number | LM1117IMPX-3.3 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | DCY SOT-223, 4-pin, 6.50 mm × 3.50 mm nominal body |
| Output Voltage | 3.3 V nominal; LM1117IMPX-3.3 fixed output version |
| Output Current | 800 mA; rated regulator output current |
| Dropout Voltage | 1.2 V; IOUT = 800 mA |
| Line Regulation | 0.2% maximum; general feature specification |
| Load Regulation | 0.4% maximum; general feature specification |
| Operating Junction Temperature | -40°C to +125°C; LM1117I version |
| Maximum Input Voltage | 20 V; absolute maximum rating, VIN to GND |
| Recommended Input Voltage | 15 V maximum; recommended operating condition, VIN to GND |
| Junction Temperature Absolute Maximum | 150°C; absolute maximum rating |
| Storage Temperature | -65°C to +150°C; absolute maximum rating |
| ESD Rating | ±2000 V; human-body model, ANSI/ESDA/JEDEC JS-001 |
| Thermal Resistance Junction-to-Ambient | 61.6°C/W; DCY SOT-223, 4 pins |
| Thermal Resistance Junction-to-Case Top | 42.5°C/W; DCY SOT-223, 4 pins |
| Thermal Resistance Junction-to-Board | 10.4°C/W; DCY SOT-223, 4 pins |
| Junction-to-Top Characterization Parameter | 2.9°C/W; DCY SOT-223, 4 pins |
| Junction-to-Board Characterization Parameter | 10.3°C/W; DCY SOT-223, 4 pins |
| Output Voltage Accuracy | 3.267 V min, 3.3 V typ, 3.333 V max; LM1117I-3.3, IOUT = 10 mA, VIN = 5 V, TJ = 25°C |
| Output Voltage Over Temperature | 3.168 V min, 3.3 V typ, 3.432 V max; LM1117I-3.3, 0 ≤ IOUT ≤ 800 mA, 4.75 V ≤ VIN ≤ 10 V, TJ = -40°C to 125°C |
| Line Regulation | 1 mV typ, 10 mV max; LM1117I-3.3, IOUT = 0 mA, 4.75 V ≤ VIN ≤ 15 V, TJ = -40°C to 125°C |
| Dropout Voltage | 1.1 V typ, 1.2 V max; IOUT = 100 mA, over junction temperature range |
| Dropout Voltage | 1.15 V typ, 1.25 V max; IOUT = 500 mA, over junction temperature range |
| Dropout Voltage | 1.2 V typ, 1.3 V max; IOUT = 800 mA, over junction temperature range |
| Current Limit | 800 mA min, 1200 mA typ, 1500 mA max; VIN - VOUT = 5 V, TJ = 25°C |
| Quiescent Current | 5 mA typ, 10 mA max; LM1117-3.3 fixed output, VIN ≤ 15 V, over junction temperature range |
| Thermal Regulation | 0.01%/W typ, 0.1%/W max; TA = 25°C, 30-ms pulse |
| Ripple Regulation | 75 dB typ, 60 dB min; fRIPPLE = 120 Hz, VRIPPLE = 1 VPP, VIN - VOUT = 3 V, over junction temperature range |
| Temperature Stability | 0.5%; electrical characteristics |
| Long-Term Stability | 0.3%; TA = 125°C, 1000 hours |
| RMS Output Noise | 0.003% of VOUT; 10 Hz ≤ f ≤ 10 kHz |
| Minimum Output Capacitor | 10 µF tantalum minimum; required at output for transient response and stability |
| Protection Features | Current limiting and thermal shutdown; device feature description |
| Pin 1 Function | GND; fixed output option, SOT-223 package |
| Pin 3 Function | VIN; SOT-223 package input voltage pin |
| Pin 2 and Tab Function | VOUT; SOT-223 package output voltage pin |
| Datasheet Status | request_only |
Product Overview
LM1117IMPX-3.3 is the fixed 3.3 V version of Texas Instruments' LM1117I low-dropout regulator family. It is specified as an 800-mA linear regulator for Power_Management designs where a regulated 3.3 V rail is required from an input within the recommended VIN-to-GND limit of 15 V.
The device is supplied in the DCY SOT-223 package, a 4-pin package with a 6.50 mm × 3.50 mm nominal body. For the fixed-output SOT-223 option, pin 1 is GND, pin 3 is VIN, and pin 2 plus the tab are VOUT, which defines the basic board connection and thermal/output node arrangement.
Electrical limits include 3.267 V to 3.333 V output accuracy at 25°C with IOUT = 10 mA and VIN = 5 V, and 3.168 V to 3.432 V across -40°C to +125°C with 0 mA to 800 mA load and 4.75 V to 10 V input. Stability requires at least a 10 µF tantalum output capacitor, and protection features include current limiting and thermal shutdown.
Key Features
- Fixed 3.3 V nominal output version
- Rated 800 mA regulator output current
- 1.2 V dropout at 800 mA load
- 0.2% maximum line regulation feature specification
- 0.4% maximum load regulation feature specification
- -40°C to +125°C operating junction range
- 15 V maximum recommended VIN-to-GND operation
- Current limiting and thermal shutdown protection
- 10 µF tantalum minimum output capacitor required
- DCY SOT-223 package with VOUT tab
Typical Applications
- 3.3 V rail regulation
- 800 mA linear regulation
- VIN-to-3.3 V conversion
- SOT-223 power layouts
- Low-dropout regulator stages
- Ripple-regulated supply outputs
- Temperature-rated power circuits
Procurement Notes
When requesting a quote for LM1117IMPX-3.3, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What output voltage does LM1117IMPX-3.3 provide?
LM1117IMPX-3.3 is the fixed-output 3.3 V nominal version. The extracted electrical data lists 3.267 V minimum, 3.3 V typical, and 3.333 V maximum at IOUT = 10 mA, VIN = 5 V, and TJ = 25°C.
What output current is this regulator rated for?
The device is specified as an 800-mA low-dropout linear regulator. Its rated regulator output current is 800 mA, and the current-limit specification is 800 mA minimum, 1200 mA typical, and 1500 mA maximum at VIN - VOUT = 5 V.
What capacitor is required on the output?
The extracted datasheet facts state that a 10 µF tantalum capacitor minimum is required at the output. This requirement is tied to transient response and stability, so it should be included in the output network design.
How are the SOT-223 pins assigned?
For the fixed-output SOT-223 option, pin 1 is GND, pin 3 is VIN, and pin 2 plus the tab are VOUT. The tab therefore shares the regulated output node in this package configuration.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.