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STMicroelectronics LF50CDT-TRY
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- Part No.:
- LF50CDT-TRY
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF50CDT-TRY.pdf
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
LF50CDT-TRY from STMicroelectronics is a 5.0 V, ±2% automotive-grade low-dropout linear regulator in DPAK package, delivering up to 500 mA output current with 0.45 V dropout at 200 mA and 50 µA quiescent current in shutdown mode. It features logic-controlled inhibit (TTL-compatible), internal thermal/current protection, and stable operation with only 2.2 µF output capacitance - designed for engine control units and ADAS power rails.
For engineers reviewing the LF50CDT-TRY datasheet, LF50CDT-TRY pinout, LF50CDT-TRY application, or LF50CDT-TRY equivalent, key selection criteria include AEC-Q100 qualification, -40 °C to 125 °C operating junction temperature, 80 dB supply rejection at 120 Hz, and compatibility with low-ESR ceramic capacitors in space-constrained automotive modules.
Technical Context
The LF50CDT-TRY implements a PNP-based LDO architecture with integrated enable control (pin 2), allowing full system-level power gating. Its internal current limit and thermal shutdown operate autonomously without external circuitry, ensuring robustness in transient overloads common in 12 V vehicle electrical systems.
It maintains regulation across input voltages from 6 V to 16 V while sustaining 5.0 V ±2% output accuracy over temperature (-40 °C to 125 °C) and load (5–500 mA), with line regulation of ≤28 mV and load regulation of ≤28 mV - critical for noise-sensitive analog and MCU power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% at 25 °C; ensures stable MCU core voltage under battery variation |
| Dropout Voltage | 0.45 V at 200 mA; enables operation down to 5.45 V input during cold-crank conditions |
| Quiescent Current | 50 µA in OFF mode; reduces standby power in always-on vehicle networks |
| Output Current | 500 mA continuous; supports multi-rail local regulation for sensor clusters |
| Supply Rejection | 80 dB at 120 Hz; suppresses alternator ripple in 12 V power distribution |
| Operating Temp | -40 °C to 125 °C junction; qualified per AEC-Q100 Grade 1 for under-hood use |
| Stability Cap | 2.2 µF ceramic; eliminates need for bulky tantalum, saving PCB area and cost |
Pinout & Package
DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND; thermally optimized for high-power-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 6–16 V DC; connects to pre-regulated 12 V rail or battery via fuse |
| 2 (ON/OFF) | Logic-enable control input | TTL-compatible; <0.8 V = shutdown, >2 V = active; drives low-power microcontroller GPIO |
| 3 (GND) | Ground reference and thermal path | Common return for IN/OUT; exposed pad must be soldered to large copper pour for RthJA = 100 °C/W |
| 4 (OUT) | Regulated output | Delivers 5.0 V ±2% to downstream logic; requires 2.2 µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (-40 °C to 125 °C) with PAT/SYL/SBL statistical testing for automotive reliability |
| Logic-controlled shutdown | Pin 2 TTL interface enables system-level power sequencing and sleep-mode current reduction |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) preserves ADC reference integrity in sensor interfaces |
| Internal protection | Auto-recovering thermal shutdown and current limiting prevent latch-up during load faults |
| Minimal external components | Only 0.1 µF input + 2.2 µF output ceramic caps required; no ESR constraints |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powering 32-bit MCU, CAN transceiver, and analog front-end in gasoline/diesel ECU modules. IC Role / Device Role / Timing Role: Primary 5 V local regulator supplying core logic and I/O banks with tight voltage tolerance. Use Value: Maintains 5.0 V ±2% under cold-crank dips to 6 V input and load transients up to 500 mA. |
Use Scenario: Supplying radar processor, camera ISP, and inertial sensor cluster in forward collision warning systems. IC Role / Device Role / Timing Role: Low-noise 5 V rail generator isolated from noisy 12 V chassis supply. Use Value: 80 dB PSRR at 120 Hz rejects alternator ripple; 50 µV noise avoids image sensor pattern noise. |
| Body Control Module (BCM) | Infotainment Power Management |
Use Scenario: Regulating power for door module microcontrollers, LIN transceivers, and LED drivers. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling wake-on-LIN functionality with ultra-low shutdown current. Use Value: 50 µA OFF-mode current extends battery life during vehicle sleep cycles (>30 days). |
Use Scenario: Providing clean 5 V bias to audio codec, touch controller, and display timing ICs. IC Role / Device Role / Timing Role: Secondary regulator decoupling infotainment SoC from main 12 V bus noise. Use Value: 2.2 µF stability cap allows compact 0805 ceramic placement near SoC power pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73350PDBVR | 300 mA output, 170 µA quiescent current in active mode, no AEC-Q100 qualification | Commercial-grade only; unsuitable for under-hood deployment | Select only for non-automotive, cost-sensitive consumer designs with lower current demand |
| NCP1117ST50T3G | 1 A output, 6 mA quiescent current, 1.2 V dropout at 800 mA, no enable pin | Lacks logic-controlled shutdown; higher dropout limits cold-crank operation | Use where continuous ON operation is acceptable and higher current headroom is needed |
Compared with TLV73350PDBVR and NCP1117ST50T3G, the LF50CDT-TRY uniquely combines AEC-Q100 Grade 1 qualification, 50 µA shutdown current, and 0.45 V dropout - making it the only viable choice for automotive modules requiring both ultra-low standby power and cold-crank resilience.
Availability
LF50CDT-TRY is available at Aetrix Electronics and suitable for engine control units, ADAS sensor nodes, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF50CDT-TRY 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities.
The LFXX series was developed specifically for automotive power management, targeting AEC-Q100-compliant local regulation in ECUs, ADAS, and telematics where low dropout, low IQ, and high PSRR are mandatory.
FAQ
What is the minimum input voltage required for regulation at full 500 mA load?
The LF50CDT-TRY maintains 5.0 V output at 500 mA with a minimum input of 5.45 V (5.0 V + 0.45 V dropout). At cold-crank, input may dip to 6 V - well above this threshold - ensuring uninterrupted operation during engine start.
Can the device operate without the ON/OFF pin connected?
Yes. When pin 2 (ON/OFF) is left unconnected or pulled high (>2 V), the device remains in active mode. Floating the pin does not induce undefined behavior; internal pull-up ensures default ON state if no external control is applied.
Is an input capacitor required, and what value is recommended?
An input capacitor is recommended: 0.1 µF ceramic placed close to the IN pin reduces high-frequency noise and improves transient response. While not strictly mandatory for stability, omission risks increased ripple coupling into the output under fast load steps.
How does thermal performance differ between DPAK and TO-220 packages?
DPAK (LF50CDT-TRY) has RthJA = 100 °C/W vs. TO-220's 50 °C/W. This means DPAK requires larger PCB copper area for heatsinking but offers superior surface-mount reliability and smaller footprint - ideal for automated SMT assembly in automotive modules.
LF50CDT-TRY 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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 76dB ~ 60dB (120Hz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF50CDT-TRY FAQ
1.How can I place an order for LF50CDT-TRY through Aetrix?
Please submit a Request for Quotation (RFQ) for LF50CDT-TRY 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 LF50CDT-TRY reliable?
The price and inventory of LF50CDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50CDT-TRY is usually 5 days.
3.What payment methods are accepted for LF50CDT-TRY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50CDT-TRY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF50CDT-TRY?
LF50CDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF50CDT-TRY 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 LF50CDT-TRY?
For technical support, including LF50CDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50CDT-TRY requirements.
6.How does Aetrix verify that LF50CDT-TRY is sourced from the original manufacturer or authorized distributors?
All LF50CDT-TRY 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 LF50CDT-TRY meets industry standards.
7.What is the process for return or replacement of LF50CDT-TRY?
All LF50CDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF50CDT-TRY, 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 LF50CDT-TRY part is unused and in its original packaging.
Return procedure for LF50CDT-TRY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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