LD1117DT33TR - 800mA Low Dropout Voltage Regulator | STMicroelectronics
N.º da peça: LD1117DT33TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.35 | $0,35 |
| 10 | $0.28 | $2,80 |
| 100 | $0.22 | $22,00 |
| 500 | $0.18 | $90,00 |
| 1.000 | $0.15 | $150,00 |
LD1117DT33TR Visão geral
A low dropout regulator (LDO) is a type of linear voltage regulator that can maintain a stable output voltage even when the input voltage is very close to the output voltage. LDOs are essential in power management systems where noise-sensitive analog circuits require clean, ripple-free power rails. They are part of the voltage regulator family, which also includes switching regulators, and are widely used in consumer electronics, industrial controls, and automotive systems.
Key features of the LD1117DT33TR include a fixed 3.3V output, 800mA output current capability, internal current limiting, and thermal shutdown protection. The device operates over a junction temperature range of -40°C to +125°C, ensuring reliable performance in harsh environments. The SOT-223 package offers a compact footprint with a thermal pad for improved heat dissipation.
The LD1117DT33TR utilizes a PNP pass transistor architecture, which provides low dropout voltage and stable operation. The internal bandgap reference ensures accurate output voltage regulation across temperature and load variations. The device is designed for simplicity, requiring only two external capacitors for stability, making it easy to integrate into various designs.
Typical applications include powering microcontrollers, FPGA core voltages, and analog sensor interfaces. The fixed 3.3V output is ideal for logic circuits and mixed-signal systems. The low dropout voltage allows operation from a 5V rail with sufficient headroom, making it suitable for 5V to 3.3V conversion in embedded systems.
When designing with the LD1117DT33TR, ensure adequate input-to-output voltage headroom to maintain regulation. The input and output capacitors should be placed close to the device pins to minimize parasitic inductance. For high current loads, consider the thermal resistance of the SOT-223 package and provide adequate copper area for heat dissipation.
Alternativas drop-in para LD1117DT33TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LD1117DT33TR (mesmo formato e footprint) — diferindo em Dropout Voltage, Line Regulation, Load Regulation, Operating Temperature Range, Quiescent Current.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LD1117DT33TR
✅ Drop-In✓ Em estoque
$0.15 / unidade
Ver ficha técnica →LD1117S33TR
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$0.2 / unidade
Ver ficha técnica →LD1117V33
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
AMS1117-3.3
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
NCP1117ST33T3G
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
AP1117-33
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LD1117DT33TR Classificações máximas e características elétricas
| Tipo de saída | Fixed |
| Tensão de saída | 3.3 V |
| Corrente máxima de saída | 800 mA |
| Faixa de tensão de entrada | Up to 15 V |
| Tensão de dropout | 1.1 V at 800 mA |
| Line Regulation | 0.2 % (typical) |
| Load Regulation | 0.4 % (typical) |
| Corrente de repouso | 5 mA (typical) |
| Faixa de temperatura de operação | -40°C to +125°C |
| Encapsulamento | SOT-223 |
| Tipo de montagem | Surface Mount |
| Thermal Resistance (θJA) | 50 °C/W (typical) |
| Status RoHS | Compliant |
| Output Capacitor | 10 µF (minimum) |
| Input Capacitor | 10 µF (recommended) |
Configuração de pinos do LD1117DT33TR
| Pino 1 | GND — Ground |
| Pino 2 | VOUT — Regulated 3.3V output |
| Pino 3 | VIN — Input voltage |
| Pino 4 | TAB — Thermal pad, connected to VOUT |
Aplicações típicas
LD1117DT33TR é adequado para 6 aplicaçãos: Microcontroller Power Supply, FPGA Core Voltage, Sensor Interface, Battery-Powered Devices, Industrial Control Systems, Consumer Electronics.
Microcontroller Power Supply
The LD1117DT33TR provides a stable 3.3V rail for microcontrollers, ensuring reliable operation. Its low dropout voltage allows efficient conversion from 5V supplies, and the 800mA current capability supports most MCU boards. The SOT-223 package is compact, making it suitable for space-constrained designs. The device's thermal shutdown protection prevents damage from overcurrent or overtemperature conditions, enhancing system reliability. In a typical application, the regulator is placed between the 5V input and the MCU's VDD pin, with 10µF capacitors on input and output for stability. The low quiescent current of 5mA helps extend battery life in portable devices. Compared to switching regulators, the LDO provides cleaner output with no switching noise, which is critical for analog peripherals. However, power dissipation must be considered; for a 5V to 3.3V conversion at 500mA, the power loss is 0.85W, requiring adequate PCB copper area for heat dissipation.
Recomendado
FPGA Core Voltage
The LD1117DT33TR can power FPGA core logic that requires a 3.3V supply. Its low dropout voltage ensures stable operation even when the input voltage is close to 3.3V, which is common in battery-powered systems. The 800mA output current is sufficient for small to medium FPGAs. The device's fast transient response helps maintain voltage stability during logic switching. In a typical FPGA application, the regulator is placed close to the FPGA's core power pins, with multiple decoupling capacitors to handle high-frequency current demands. The thermal shutdown feature protects the FPGA from overcurrent events. The SOT-223 package's thermal pad aids in heat dissipation, which is important for continuous operation. Compared to switching regulators, the LDO provides lower noise, which is beneficial for FPGA-based signal processing. However, the power dissipation at higher currents may require additional cooling measures.
Recomendado
Sensor Interface
The LD1117DT33TR provides a clean 3.3V supply for analog sensors, ensuring accurate readings. Its low noise output minimizes interference in sensitive measurement circuits. The 800mA current capability can power multiple sensors simultaneously. The device's line and load regulation of 0.2% and 0.4% respectively ensure stable voltage under varying conditions. In a typical sensor application, the regulator is used to power a temperature sensor or pressure sensor, with a 10µF output capacitor to filter noise. The low dropout voltage allows operation from a 3.6V battery, extending battery life. The thermal shutdown protection prevents damage from short circuits. Compared to switching regulators, the LDO's low noise is essential for high-precision analog measurements. However, the power dissipation must be managed, especially when powering multiple sensors at higher currents.
Recomendado
Battery-Powered Devices
The LD1117DT33TR is ideal for battery-powered devices due to its low quiescent current of 5mA and low dropout voltage. It can efficiently regulate a 3.3V output from a 3.7V Li-ion battery, maximizing battery life. The 800mA output current supports a wide range of portable applications. The device's thermal shutdown protection ensures safe operation during high current draws. In a typical battery-powered device, the regulator is placed between the battery and the main circuit, with a 10µF input capacitor to handle battery voltage fluctuations. The low dropout voltage allows the device to operate until the battery is nearly discharged. Compared to switching regulators, the LDO's simplicity and low noise are advantageous for audio and RF circuits. However, the power dissipation in the LDO can reduce efficiency, so it is important to match the load current to the regulator's capabilities.
Recomendado
Industrial Control Systems
The LD1117DT33TR is suitable for industrial control systems that require a reliable 3.3V supply. Its wide operating temperature range of -40°C to +125°C ensures performance in harsh environments. The 800mA output current can power logic circuits, relays, and sensors. The device's thermal shutdown and current limiting features protect against faults. In a typical industrial application, the regulator is used to power a PLC's I/O modules, with input and output capacitors for stability. The low dropout voltage allows operation from a 5V rail with sufficient headroom. The SOT-223 package is robust and suitable for PCB mounting in industrial equipment. Compared to switching regulators, the LDO's low noise is beneficial for analog control signals. However, the power dissipation at high currents may require heatsinking or forced air cooling.
Recomendado
Consumer Electronics
The LD1117DT33TR is widely used in consumer electronics such as set-top boxes, routers, and gaming consoles. Its fixed 3.3V output is compatible with many digital ICs. The 800mA current capability supports multiple peripherals. The device's low cost and small SOT-223 package make it ideal for high-volume production. In a typical consumer device, the regulator is used to power a system-on-chip (SoC) or memory, with 10µF capacitors for stability. The low dropout voltage allows efficient conversion from a 5V USB supply. The thermal shutdown protection prevents damage from overheating. Compared to switching regulators, the LDO's simplicity reduces BOM cost and design complexity. However, the power dissipation must be considered for continuous operation, and adequate PCB copper area is recommended.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LD1117DT33TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LD1117S33TR | AMS1117-3.3 | NCP1117ST33T3G |
|---|---|---|---|---|
| Package | SOT-223 | SOT-223 | SOT-223 | SOT-223 |
| Brand | STMicroelectronics | STMicroelectronics | Advanced Monolithic Systems | onsemi |
| Output Voltage | 3.3V | 3.3V | 3.3V | 3.3V |
| Maximum Output Current | 800mA | 800mA | 1A | 1A |
| Dropout Voltage | 1.1V at 800mA | 1.1V at 800mA | 1.3V at 1A | 1.2V at 1A |
| Quiescent Current | 5mA | 5mA | 5mA | 5mA |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
| RoHS Compliant | Yes | Yes | Yes | Yes |
Principais diferenciais
- Low dropout voltage of 1.1V at 800mA (vs AMS1117-3.3)
- Lower quiescent current of 5mA (vs NCP1117ST33T3G)
- Wide operating temperature range (vs AP1117-33)
Notas de projeto
The SOT-223 package has a thermal resistance (θJA) of approximately 50°C/W. For a 5V to 3.3V conversion at 800mA, power dissipation is 1.36W, resulting in a junction temperature rise of 68°C above ambient. Ensure adequate PCB copper area (at least 1 square inch) connected to the thermal pad to keep the junction temperature within the -40°C to +125°C range.
Place a 10µF input capacitor and a 10µF output capacitor as close to the VIN and VOUT pins as possible. Use low-ESR ceramic capacitors for better high-frequency performance. The thermal pad (pin 4) should be connected to a large copper area for heat dissipation and also connected to VOUT for proper operation.
Do not exceed the maximum input voltage of 15V. Ensure the output capacitor is at least 10µF to maintain stability; using a smaller capacitor may cause oscillation. The device does not have an enable pin, so power sequencing must be handled externally if required.
Informações de conformidade
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualification not specified for this part.
