Specifications
| Type | Description |
|---|---|
| Part Number | LM1117MPX-3.3 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | SOT-223 (DCY), 4-pin, 6.50 mm × 3.50 mm nominal body |
| Output Voltage | 3.267 V min, 3.3 V typ, 3.333 V max; LM1117-3.3, IOUT=10 mA, VIN=5 V, TJ=25°C |
| Output Voltage Over Temperature | 3.235 V min, 3.365 V max; 0 ≤ IOUT ≤ 800 mA, 4.75 V ≤ VIN ≤ 10 V, TJ=0°C to 125°C |
| Output Current | 800 mA rated output current |
| Dropout Voltage at 800 mA | 1.2 V typ, 1.3 V max; IOUT=800 mA |
| Dropout Voltage at 500 mA | 1.15 V typ, 1.25 V max; IOUT=500 mA |
| Dropout Voltage at 100 mA | 1.1 V typ, 1.2 V max; IOUT=100 mA |
| Line Regulation | 1 mV typ, 6 mV max; IOUT=0 mA, 4.75 V ≤ VIN ≤ 15 V |
| Load Regulation | 1 mV typ, 10 mV max; VIN=4.75 V, 0 ≤ IOUT ≤ 800 mA |
| 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; VIN ≤ 15 V |
| Maximum Input Voltage | 20 V absolute maximum rating, VIN to GND |
| Recommended Input Voltage | 15 V max recommended operating condition, VIN to GND |
| Operating Junction Temperature | 0°C to 125°C recommended operating condition |
| Maximum Junction Temperature | 150°C absolute maximum rating |
| Storage Temperature | -65°C to 150°C absolute maximum rating |
| ESD Rating | ±2000 V human-body model per ANSI/ESDA/JEDEC JS-001 |
| Thermal Resistance Junction-to-Ambient | 61.6°C/W, DCY SOT-223 package, 4 pins |
| Thermal Resistance Junction-to-Case Top | 42.5°C/W, DCY SOT-223 package, 4 pins |
| Thermal Resistance Junction-to-Board | 10.4°C/W, DCY SOT-223 package, 4 pins |
| Thermal Regulation | 0.01 %/W typ, 0.1 %/W max; TA=25°C, 30-ms pulse |
| Ripple Rejection | 75 dB typ, 60 dB min; fRIPPLE=120 Hz, VRIPPLE=1 VPP, VIN - VOUT=3 V |
| RMS Output Noise | 0.003% of VOUT; 10 Hz ≤ f ≤ 10 kHz |
| Temperature Stability | 0.5% |
| Long Term Stability | 0.3%; TA=125°C, 1000 hours |
| Output Capacitor Requirement | 10 µF minimum tantalum capacitor required at output for transient response and stability |
| Protection Features | Current limiting and thermal shutdown |
| Input Pin | Pin 3, SOT-223 package |
| Output Pin | Pin 2 and TAB, SOT-223 package |
| Ground Pin | Pin 1, fixed output option, SOT-223 package |
| Datasheet Status | request_only |
Product Overview
LM1117MPX-3.3 is a Texas Instruments fixed-output low-dropout linear regulator for 3.3 V power rails. It is specified as an 800-mA device, with output voltage characterized at 3.267 V minimum, 3.3 V typical, and 3.333 V maximum at IOUT = 10 mA, VIN = 5 V, and TJ = 25°C. Across 0 mA to 800 mA, 4.75 V to 10 V input, and 0°C to 125°C junction temperature, the output range is specified from 3.235 V to 3.365 V.
The regulator supports input operation up to 15 V as a recommended condition, with 20 V listed as the absolute maximum rating from VIN to GND. Dropout voltage is specified at 1.1 V typical at 100 mA, 1.15 V typical at 500 mA, and 1.2 V typical at 800 mA. Line regulation is 1 mV typical, and load regulation is 1 mV typical under the stated LM1117-3.3 test conditions.
The SOT-223 DCY package uses pin 3 for input, pin 2 and TAB for output, and pin 1 for ground on the fixed-output option. The output requires a 10 µF minimum tantalum capacitor for transient response and stability. Protection functions include current limiting and thermal shutdown.
Key Features
- 800 mA rated low-dropout linear regulator output
- Fixed 3.3 V typical output voltage
- 3.235 V to 3.365 V output over temperature
- 1.2 V typical dropout at 800 mA load
- 1 mV typical line regulation
- 1 mV typical load regulation
- 5 mA typical quiescent current
- 75 dB typical ripple rejection at 120 Hz
- Current limiting and thermal shutdown included
- 10 µF minimum tantalum output capacitor required
Typical Applications
- 3.3 V regulated power rails
- Linear post-regulation from higher inputs
- Low-dropout 800 mA supply outputs
- Ripple-sensitive 3.3 V circuits
- SOT-223 board-level power regulation
- Thermally protected fixed-voltage supplies
Procurement Notes
When requesting a quote for LM1117MPX-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 LM1117MPX-3.3 provide?
LM1117MPX-3.3 is specified as a fixed 3.3 V regulator. Under LM1117-3.3 test conditions of IOUT = 10 mA, VIN = 5 V, and TJ = 25°C, output voltage is 3.267 V minimum, 3.3 V typical, and 3.333 V maximum.
What output capacitor is required for this regulator?
The extracted datasheet facts specify a 10 µF minimum tantalum capacitor at the output. This capacitor is required for transient response and stability, so the output capacitor selection is part of the regulator operating requirement.
What are the SOT-223 pin assignments?
For the fixed-output SOT-223 package option, pin 3 is the input, pin 2 and the TAB are the output, and pin 1 is ground. These assignments apply to the SOT-223 package listed for LM1117MPX-3.3.
What protection functions are included?
The device feature description lists current limiting and thermal shutdown. Current limit is specified at 800 mA minimum, 1200 mA typical, and 1500 mA maximum with VIN - VOUT = 5 V at TJ = 25°C.
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.