Texas Instruments LM1117IDTX-3.3/NOPB
- Part No.:
- LM1117IDTX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LM1117IDTX-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 800MA TO252-3
- Quantity:
-
Unit Price:$0
Ext Price:$0
- Payment:
-
- Shipping:
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LM1117IDTX-3.3/NOPB Information
- Specifications
- Product Details
- Comparison
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LM1117-3.3
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- 10 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
- Datasheet:
-
LM1117IDTX-3.3/NOPB.pdf
LM1117IDTX-3.3/NOPB — 800mA Fixed 3.3V LDO Voltage Regulator (TO-252)
The LM1117IDTX-3.3/NOPB is a fixed 3.3V LDO linear regulator from Texas Instruments, rated for 800mA output current in a TO-252 (DPAK) surface-mount package. Dropout voltage is 1.2V typical at full load — so you need at least 4.5V in to get a clean 3.3V out.
It's TI's version of the classic 1117-series regulator. Compared to the common AMS1117, it offers ±1% typical accuracy and guaranteed current limiting, thermal shutdown, and −40°C to +125°C operation. The TO-252 package dissipates heat into PCB copper for better thermals than SOT-223 at higher currents.
What Are the Technical Specifications of LM1117IDTX-3.3/NOPB?
| Parameter | Value |
|---|---|
| Type | Fixed Positive Linear LDO Regulator |
| Output Voltage | 3.3V fixed |
| Output Current | 800mA max |
| Input Voltage Range | 2.6V to 15V (regulation from ~4.5V) |
| Dropout Voltage (VDO) | 1.2V typ, 1.4V max @ 800mA |
| Output Accuracy | ±1% typ, ±3% max over temp |
| Line Regulation | 1mV typ |
| Load Regulation (10mA–800mA) | 1mV typ |
| Quiescent Current (IQ) | 5mA typ, 10mA max |
| PSRR @ 120Hz | 75dB typ |
| Output Noise | 38µVRMS |
| Package | TO-252-3 (DPAK), θJA = 45.1°C/W |
| Operating Temperature | −40°C to +125°C (junction) |
| Protection | Current limit, thermal shutdown |
| Output Capacitor | 10µF min tantalum, ESR 0.3Ω–22Ω |
| Packaging | Tape & Reel, 2,500 pcs/reel |
Key numbers that matter. The 1.2V typical dropout at 800mA means a 5V rail gives you 3.8V of headroom — comfortable. A 3.7V Li-ion battery at end-of-discharge gives you only 3.7V − 1.2V = 2.5V — not enough to regulate to 3.3V. This is the single most common misapplication of the 1117 series.
Per the TI LM1117-N datasheet (Rev L, SNOS412L), the output capacitor is not optional. The device needs a minimum 10µF tantalum with ESR between 0.3Ω and 22Ω for stability. Using a ceramic output cap without series resistance can send the control loop into oscillation.
LM1117IDTX-3.3 Pinout (TO-252 / DPAK)
Pin 1 is GND on the fixed-voltage version. The tab is electrically connected to VOUT — do not connect the tab to ground. Solder the tab to a large PCB copper area for heat dissipation.
When Should You Use (and NOT Use) the LM1117IDTX-3.3?
Use LM1117IDTX-3.3 when:
- 5V-to-3.3V regulation at up to 800mA. A 5V USB or ATX rail into an LM1117 gives a clean, low-noise 3.3V rail for microcontrollers, sensors, and logic. At 800mA, power dissipation is (5V−3.3V)×0.8A = 1.36W — manageable with the TO-252's 45°C/W θJA and a reasonable copper pour.
- Post-regulation after a switching converter. A buck converter gives you efficiency; the LM1117 after it gives you low noise. Common in mixed-signal designs: buck for the high-current rail, LDO for the analog supply.
- Industrial and automotive temperature range. −40°C to +125°C with ±3% accuracy across the full range means it works where AMS1117 clones drift or fail.
- Drop-in AMS1117-3.3 replacement where quality matters. Same pinout, same package options. The TI part costs more but delivers tighter accuracy and guaranteed protection features.
Don't use LM1117IDTX-3.3 when:
- Li-ion battery to 3.3V regulation. A single Li-ion cell (3.7V nominal, 3.0V cutoff) doesn't give enough headroom for the 1117's 1.2V dropout. Use a buck-boost converter or a true low-dropout regulator like the TPS73633 (75mV dropout).
- Vin above 9V at high current. At 12V in and 800mA out, you're dissipating (12−3.3)×0.8 = 7W. Even with optimal PCB heatsinking, that's pushing the TO-252 beyond its thermal limit. Use a switching regulator for large Vin-Vout differentials.
- Ultra-low standby power. The 1117 draws 5mA quiescent even at zero load. For battery-powered designs that sleep at microamps, use a low-IQ LDO like the LP5912-3.3 (30µA IQ).
- Ceramic-only output capacitor without ESR consideration. The LM1117 was designed for tantalum capacitors with 0.3Ω–22Ω ESR. A pure MLCC on the output can cause oscillation. If you must use ceramic, add a series resistor or use a ceramic-stable LDO.
What Are the Alternatives to LM1117IDTX-3.3/NOPB?
| Model | Type | Key Difference | Best For |
|---|---|---|---|
| AMS1117-3.3 | Fixed LDO, SOT-223 | Same 3.3V/800mA, lower cost, looser accuracy | Cost-sensitive, non-critical 3.3V rails |
| LM1117MPX-3.3/NOPB | Fixed LDO, SOT-223 | Same specs, smaller SOT-223 package | Space-constrained layouts |
| TPS73633DBVR | True LDO, SOT-23-5 | 75mV dropout, 400mA, 30µA IQ | Li-ion to 3.3V, battery-powered |
| LP5912-3.3DRVR | Low-Noise LDO, WSON-6 | 95mV dropout @ 500mA, 12µV noise | Low-noise analog, RF, ADC supplies |
| LM317AMDTX/NOPB | Adjustable LDO, TO-252 | 1.2V–37V adjustable, 1.5A, needs R-divider | Non-standard voltages, high current |
LM1117 vs AMS1117 — TI or clone? The AMS1117 is the original second-source, but the market is flooded with clones. TI's LM1117IDTX-3.3/NOPB gives you a traceable part with ±1% typical accuracy and a current limit that works. Price difference at volume: under $0.10. For production, it's cheap insurance.
LM1117 vs TPS73633 — dropout voltage is the fork in the road. The TPS73633's 75mV dropout means it regulates 3.3V from a 3.4V input. But it's limited to 400mA and costs more. If your input is a solid 5V and you need 800mA, the 1117 is the better fit.
Dropout Voltage: 1117-Class LDOs Compared
The LM1117 is a medium-dropout regulator. It's low-dropout compared to old-school NPN regulators like the 7805, but not low-dropout by modern CMOS standards. Plan your input voltage accordingly.
Typical Application: 5V to 3.3V MCU Supply
Standard 5V-to-3.3V configuration. The input capacitor handles line transients; the output capacitor is mandatory for loop stability. For ESP32 applications, add a 100µF bulk electrolytic near the module to handle WiFi transmit current spikes.
How Much Does the LM1117IDTX-3.3/NOPB Cost and Is It in Stock?
| Quantity | Reference Price (per unit) |
|---|---|
| 1–99 | $0.20–$0.40 |
| 100–999 | $0.12–$0.25 |
| 1,000+ (full reel) | $0.08–$0.15 |
Contact ICMASS for a same-day quote. The TI LM1117 costs more than no-name AMS1117 clones but less than a buck converter plus the inductors and caps it needs. For production BOMs where reliability matters, it's the right price point. Reel quantities of 2,500 ship same-day from Shenzhen.
What Are the Typical Applications of LM1117IDTX-3.3?
Microcontroller 3.3V rail from 5V USB or ATX power. The most common application: regulate a noisy 5V rail down to a clean 3.3V for STM32, ESP32, or ATmega MCUs. The 75dB PSRR at 120Hz and 47dB at 100kHz filters out switching noise from upstream converters.
Post-regulator for analog supplies. After a buck converter delivers the main 5V rail, an LM1117 provides a low-noise 3.3V rail for ADCs, op-amps, and voltage references. The 38µVRMS output noise is quiet enough for 12-bit ADC applications.
Automotive 12V to 3.3V (low current). With 12V input at 200mA, dissipation is (12−3.3)×0.2 = 1.74W. A 45°C/W TO-252 on 2cm² of copper keeps the junction at ~100°C at 25°C ambient. For higher currents from 12V, use a switching pre-regulator.
Why Buy LM1117IDTX-3.3/NOPB from ICMASS?
Genuine TI parts, full traceability. We source LM1117IDTX-3.3/NOPB direct from TI authorized distribution. Every reel has date code traceability back to the TI fab. No remarked AMS1117s with the TI logo scrubbed on.
Cross-reference and BOM support. If your BOM calls for LM1117IDTX-3.3 but the SOT-223 version (LM1117MPX-3.3) fits your layout better, we'll flag it. Need an adjustable version? We stock the LM317AMDTX in the same TO-252 package.
Single-source power management procurement. You're likely ordering 1117s alongside buck converters, MOSFETs, Schottky diodes, and the MCUs they power. One shipment covers the entire power tree.
Shenzhen warehouse, same-day shipping. Orders before 15:00 CST ship same day. International DHL/FedEx delivery in 5–10 business days.
Frequently Asked Questions About LM1117IDTX-3.3/NOPB
Q1: Can I power an ESP32 directly from the LM1117IDTX-3.3 with a 5V USB supply?
A: Yes, with adequate output capacitance. The LM1117's 800mA rating covers ESP32 peak current (~500mA during WiFi TX). Add a 100µF bulk capacitor near the ESP32 module to handle ~300mA transmit current spikes lasting 100–400µs. Without it, the LDO's transient response can dip the rail and cause brownout resets.
Q2: Why does my LM1117 oscillate with a ceramic output capacitor?
A: The LM1117 control loop requires ESR between 0.3Ω and 22Ω on the output capacitor. MLCC capacitors have ESR well below 0.1Ω — too low. The loop phase margin collapses and the output oscillates. Fix: use a tantalum capacitor, or add a 0.5Ω–1Ω resistor in series with your ceramic cap. Per the TI LM1117-N datasheet (Rev L), the ESR requirement is explicit in the stability section.
Q3: Can I use the LM1117IDTX-3.3 from a single Li-ion cell?
A: No. A Li-ion cell ranges from 4.2V (full) to 3.0V (cutoff). At 3.7V nominal, the 1.2V dropout leaves only 2.5V at the output — not enough for 3.3V regulation. Use a buck-boost converter (TPS630xx) or a true low-dropout LDO (TPS73633, 75mV dropout) for Li-ion applications.
Q4: LM1117IDTX vs LM1117MPX — what's the difference?
A: Package only. The IDTX is TO-252 (DPAK) with a metal tab for PCB heatsinking. The MPX is SOT-223, smaller footprint but higher thermal resistance. At 800mA from 5V, the TO-252 runs about 15–20°C cooler with the same PCB copper area. Choose TO-252 for >400mA continuous; SOT-223 for lighter loads.
Q5: Do I need a heatsink on the LM1117IDTX-3.3?
A: The PCB copper is the heatsink. The TO-252's exposed tab solders directly to a copper pour on the PCB. At 800mA from 5V (1.36W dissipation), a 2cm² copper area keeps the junction within safe limits. For higher dissipation, increase the copper area or add thermal vias to a ground plane on the back side.
Q6: What's the minimum input voltage for reliable 3.3V output?
A: 4.5V minimum, 4.75V recommended. The 1.2V typical dropout plus some margin for line transients puts the practical minimum at ~4.5V. Below this, the output voltage drops and PSRR degrades significantly. A 5V USB rail (4.75V–5.25V) is the ideal input source.
Related Products
- LM1117MPX-3.3/NOPB — Same regulator, SOT-223 package
- LM1117MPX-1.8/NOPB — 1.8V fixed output version
- LM317AMDTX/NOPB — Adjustable 1.5A LDO, same TO-252
- LP5912-3.3DRVR — Low-noise 500mA LDO, 95mV dropout
- AMS1117-3.3 — Lower-cost 3.3V LDO, SOT-223
- TPS73633DBVR — True LDO, 75mV dropout, 400mA
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| Part Number | LM1117IDTX-3.3/NOPB | LM1117IDTX-ADJ/NOPB | LM1117IDTX-5.0/NOPB | LM1117IDTX-5.0 | LM1117IDTX-3.3/J7003099 |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Series | LM1117-3.3 | - | - | - | - |
| Package/Case | TO-252-3, DPAK (2 Leads + Tab), SC-63 | TO-252-3, DPAK (2 Leads + Tab), SC-63 | TO-252-3, DPAK (2 Leads + Tab), SC-63 | TO-252-3, DPAK (2 Leads + Tab), SC-63 | TO-252-3, DPAK (2 Leads + Tab), SC-63 |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Bulk |
| Product Status | Active | Active | Active | Obsolete | Active |
| Output Configuration | Positive | Positive | Positive | Positive | Positive |
| Output Type | Fixed | Adjustable | Fixed | Fixed | Adjustable |
| Number of Regulators | 1 | 1 | 1 | 1 | 1 |
| Voltage - Input (Max) | 15V | 15V | 15V | 15V | 15V |
| Voltage - Output (Min/Fixed) | 3.3V | 1.25V | 5V | 5V | 3.3V |
| Voltage - Output (Max) | - | 13.8V | - | - | - |
| Voltage Dropout (Max) | 1.2V @ 800mA | 1.2V @ 800mA | 1.2V @ 800mA | 1.2V @ 800mA | 1.3V @ 800mA |
| Current - Output | 800mA | 800mA | 800mA | 800mA | 800mA |
| Current - Quiescent (Iq) | 5 mA | 5 mA | 5 mA | 5 mA | 10 mA |
| Current - Supply (Max) | 10 mA | 10 mA | 10 mA | 10 mA | - |
| PSRR | 75dB (120Hz) | 75dB (120Hz) | 75dB (120Hz) | 75dB (120Hz) | 75dB (120Hz) |
| Control Features | - | - | - | - | - |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature | Over Current, Over Temperature | Over Current, Over Temperature | Over Current, Over Temperature |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Supplier Device Package | TO-252-3 | TO-252-3 | TO-252-3 | TO-252-3 | TO-252 |
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