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STMicroelectronics LD1117DT33CTR
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- Part No.:
- LD1117DT33CTR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD1117DT33CTR.pdf
- Description:
- IC REG LINEAR 3.3V 800MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
LD1117DT33CTR from STMicroelectronics is a fixed-output 3.3 V low-dropout linear voltage regulator delivering up to 800 mA output current with 1.1 V typical dropout at 800 mA, ±1 % output voltage tolerance at 25 °C, and 75 dB supply voltage rejection at 120 Hz - used in embedded power rails for microcontrollers, sensors, and communication interfaces where stable 3.3 V supply is required under varying input conditions.
For engineers reviewing the LD1117DT33CTR datasheet, LD1117DT33CTR pinout, LD1117DT33CTR application, or LD1117DT33CTR equivalent, key selection considerations include dropout voltage at full load, thermal resistance in SOT-223 package, output voltage accuracy over temperature, and minimum 10 µF output capacitor requirement for stability.
Technical Context
The LD1117DT33CTR uses an NPN pass transistor architecture, enabling high efficiency by routing quiescent current primarily into the load rather than ground - unlike PNP-based regulators. Its internal bandgap reference and error amplifier maintain regulation across input voltages from 4.75 V to 15 V.
Thermal protection and current limiting are integrated on-die, with junction temperature operating range of −40 °C to +125 °C (C-grade). The device achieves ±1 % initial output tolerance via laser trimming and supports stable operation with only a 10 µF ceramic or tantalum output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1 % tolerance at 25 °C ensures reliable logic-level compliance for 3.3 V I/O systems. |
| Max Output Current | 800 mA continuous - sufficient to power ARM Cortex-M microcontrollers, RS-485 transceivers, or multiple digital ICs from a single rail. |
| Dropout Voltage | 1.1 V typ. at 800 mA - enables regulation from 4.4 V input, supporting wide-input industrial or battery-derived supplies. |
| Supply Voltage Rejection | 75 dB typ. at 120 Hz - suppresses ripple from upstream switching converters or noisy DC-DC stages feeding the LDO. |
| Thermal Resistance (J-A) | 110 °C/W (SOT-223) - requires PCB copper pour or heatsinking for sustained 800 mA operation above ambient 60 °C. |
| Operating Input Range | 4.75 V to 15 V DC - compatible with 5 V, 9 V, and 12 V system rails while maintaining regulation margin. |
| Output Noise | 100 µV RMS (10 Hz–10 kHz) - low enough for analog sensor front-ends and ADC reference supplies. |
Pinout & Package
LD1117DT33CTR is housed in a SOT-223 surface-mount package with exposed thermal pad connected internally to VOUT. The TAB serves as the output terminal and must be soldered to a thermal land for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab) | VOUT | Primary output terminal and thermal path; must be connected to PCB copper area ≥ 100 mm² for rated current. |
| 2 | GND | Ground reference for regulation loop and internal circuitry; low-impedance connection critical for noise immunity. |
| 3 | VIN | Unregulated input supply; requires local 10 µF ceramic capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 1.1 V max at 800 mA enables use with narrow input–output margins, e.g., 5 V → 3.3 V conversion in USB-powered systems. |
| Output Accuracy | ±1 % at 25 °C and ±2 % over full −40 °C to +125 °C range ensures consistent logic voltage levels across environmental extremes. |
| Stability | Guaranteed stable with ≥10 µF output capacitance - eliminates need for specialized low-ESR capacitors in cost-sensitive designs. |
| Protection | Integrated thermal shutdown and current limit prevent damage during overload or ambient temperature rise. |
| Quiescent Current | 5–10 mA independent of load - predictable power budgeting for always-on subsystems. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering isolated digital input buffers and CAN transceiver logic rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying microcontroller core and peripheral I/O, decoupled from noisy 24 V field bus. Use Value: 75 dB SVR rejects conducted noise from solenoid drivers; 110 °C/W RthJA allows convection cooling without heatsink in sealed enclosures. |
Use Scenario: Regulating 3.3 V supply for LIN transceivers and door module MCUs fed from vehicle battery (9–16 V). IC Role / Device Role / Timing Role: Post-regulator after buck converter, providing clean, accurate voltage for timing-critical serial interface logic. Use Value: ±1 % output tolerance maintains UART baud rate accuracy; −40 °C to +125 °C operation meets AEC-Q100 Grade 2 requirements. |
| Medical Patient Monitor Sensors | IoT Edge Node Microcontrollers |
|
Use Scenario: Supplying low-noise 3.3 V to analog front-end amplifiers and 24-bit sigma-delta ADCs in portable ECG modules. IC Role / Device Role / Timing Role: Precision analog rail generator with minimal output ripple affecting signal integrity. Use Value: 100 µV RMS noise avoids degradation of >100 dB SNR measurements; 1.1 V dropout preserves headroom from single-cell Li-ion (3.0–4.2 V). |
Use Scenario: Powering ESP32-WROOM-32 and external flash memory in battery-operated smart meters with 3.3 V logic interface. IC Role / Device Role / Timing Role: Main system LDO converting 3.6–4.2 V Li-Po to regulated 3.3 V for RF and digital subsystems. Use Value: 800 mA capability supports WiFi burst transmit; SOT-223 footprint enables compact two-layer PCB layout with thermal relief. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73333PDBVR | Lower dropout (250 mV @ 300 mA), lower IQ (45 µA), but rated only for 300 mA max output. | Suitable for ultra-low-power IoT nodes; insufficient for 800 mA loads like motor drivers or multi-peripheral MCUs. | Select when load current ≤300 mA and battery life is prioritized over peak current capability. |
| AP2112K-3.3TRG1 | Higher dropout (600 mV @ 600 mA), ±2 % tolerance, no thermal shutdown flag, RthJA = 160 °C/W (SOT-23-5). | Acceptable for space-constrained consumer devices with light loads; lacks robust thermal protection for industrial use. | Choose only for cost-sensitive, low-current (<400 mA), non-safety-critical applications with ample board area for thermal management. |
Compared with TLV73333PDBVR and AP2112K-3.3TRG1, LD1117DT33CTR uniquely balances high output current (800 mA), tight tolerance (±1 %), and proven thermal ruggedness in SOT-223 - making it the preferred choice for industrial and automotive subsystems demanding reliability at moderate power levels.
Availability
LD1117DT33CTR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor modules requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LD1117DT33CTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
LD1117DT33CTR belongs to ST's legacy linear regulator product line, engineered specifically for cost-effective, thermally robust, and high-accuracy DC-DC conversion in resource-constrained embedded systems.
FAQ
What is the minimum input voltage required for LD1117DT33CTR to maintain regulation at 800 mA?
The minimum input voltage is calculated as VOUT + VDROP = 3.3 V + 1.2 V = 4.5 V (max dropout at 800 mA per datasheet Table 12). For guaranteed regulation across temperature and process variation, 4.75 V is specified as absolute minimum input in electrical characteristics - aligning with the 4.75 V lower bound in the "Vin Operating input voltage" parameter.
Can LD1117DT33CTR be used with ceramic output capacitors?
Yes - the datasheet explicitly states stability is ensured with ≥10 µF ceramic, tantalum, or aluminum electrolytic capacitors. No ESR requirements are imposed, unlike older LDOs; ceramic capacitors are fully supported and recommended for low-profile, high-reliability designs.
Does LD1117DT33CTR include reverse-polarity protection?
No - the device lacks integrated reverse-voltage protection. Applying reverse polarity (e.g., VIN < GND) may cause latch-up or permanent damage. External protection, such as a series Schottky diode or MOSFET-based ideal diode, must be added if reverse input is possible in the system.
How does the SOT-223 thermal pad connection affect maximum output current?
The exposed thermal pad (connected to VOUT) must be soldered to ≥100 mm² of 2-oz copper on the PCB to achieve the 110 °C/W RthJA rating. Without adequate copper area, junction temperature rises rapidly - derating to ~400 mA at 25 °C ambient is typical for minimal pad exposure, per thermal simulation data in ST AN4402.
LD1117DT33CTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- 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):
- 1.3V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- 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:
- DPAK
LD1117DT33CTR FAQ
1.How can I place an order for LD1117DT33CTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1117DT33CTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LD1117DT33CTR reliable?
The price and inventory of LD1117DT33CTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117DT33CTR is usually 5 days.
3.What payment methods are accepted for LD1117DT33CTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117DT33CTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1117DT33CTR?
LD1117DT33CTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1117DT33CTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LD1117DT33CTR?
For technical support, including LD1117DT33CTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117DT33CTR requirements.
6.How does Aetrix verify that LD1117DT33CTR is sourced from the original manufacturer or authorized distributors?
All LD1117DT33CTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD1117DT33CTR meets industry standards.
7.What is the process for return or replacement of LD1117DT33CTR?
All LD1117DT33CTR units undergo pre-shipment inspection (PSI). If there is an issue with LD1117DT33CTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LD1117DT33CTR part is unused and in its original packaging.
Return procedure for LD1117DT33CTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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