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STMicroelectronics LF50ABDT-TR
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- Part No.:
- LF50ABDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF50ABDT-TR.pdf
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:18,009
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Product details
Overview
LF50ABDT-TR from STMicroelectronics is a 5.0 V, ±1% tolerance automotive-grade low-dropout linear regulator in DPAK package, featuring 0.4 V dropout at 500 mA, 50 µA quiescent current in OFF mode, and logic-controlled shutdown. It delivers stable local power for engine control units, body electronics, and infotainment subsystems under harsh automotive conditions (−40 °C to 125 °C).
For engineers reviewing the LF50ABDT-TR datasheet, LF50ABDT-TR pinout, LF50ABDT-TR application, or LF50ABDT-TR equivalent, key selection criteria include dropout voltage at full load, shutdown logic compatibility (TTL), AEC-Q100 qualification, thermal resistance (RthJA = 100 °C/W), and minimum 2.2 µF output capacitance requirement.
Technical Context
The LF50ABDT-TR implements a PNP-based LDO architecture with internal current and thermal limiting, enabling robust operation without external protection circuitry. Its inhibit function accepts TTL-compatible logic signals on pin 2 to disable output and reduce quiescent current to 50 µA.
Designed for automotive systems, it meets AEC-Q100 Grade 1 requirements and supports input voltages from 6 V to 16 V with line regulation of ≤28 mV and load regulation of ≤28 mV across its operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1% at 25 °C; ensures precise rail generation for MCU core and peripheral supplies |
| Dropout Voltage | 0.4 V max at 500 mA; enables operation with minimal headroom (e.g., 5.4 V input sustains 5.0 V output) |
| Quiescent Current | 50 µA in OFF mode; reduces standby power in always-on vehicle modules |
| Output Current | 500 mA continuous; sufficient for powering microcontrollers, sensors, and CAN transceivers |
| Supply Rejection | 76 dB at 120 Hz; suppresses battery ripple and alternator noise in automotive electrical systems |
| Operating Temp | −40 °C to +125 °C junction; qualified per AEC-Q100 for under-hood and cabin applications |
| Stability Cap | 2.2 µF ceramic output capacitor; minimizes board area and cost vs. traditional 10–22 µF electrolytics |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad electrically connected to GND; thermally optimized for PCB copper pour mounting and high-reliability automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 6–16 V DC; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 2 – INH | Inhibit control input | TTL-compatible enable/disable: <0.8 V = OFF (50 µA IQ), >2.0 V = ON (500 µA IQ) |
| 3 – GND | Ground reference | Common return path; tied to exposed thermal pad for thermal and electrical integrity |
| 4 – OUT | Regulated output | Delivers 5.0 V ±1%; requires ≥2.2 µF ceramic capacitor with ESR 0.1–10 Ω |
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 accepts standard TTL levels to reduce system-level standby power without external FET |
| Low thermal resistance | RthJA = 100 °C/W (DPAK); enables 500 mA operation with minimal heatsinking on 2-layer PCB |
| High PSRR at low frequency | 76 dB @ 120 Hz; mitigates alternator-induced ripple in 12 V battery systems |
| Minimal external components | Only two capacitors required (0.1 µF input, 2.2 µF output); simplifies layout and BOM |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering 32-bit MCU, CAN controller, and analog sensor interface in engine bay. IC Role / Device Role / Timing Role: Local 5 V LDO providing clean, regulated supply independent of noisy 12 V battery rail. Use Value: 0.4 V dropout allows operation during cranking (battery dip to 6.5 V); AEC-Q100 qualification ensures lifetime reliability at 125 °C junction. |
Use Scenario: Supplying door module microcontroller and LIN transceiver in passenger compartment. IC Role / Device Role / Timing Role: Primary 5 V regulator with logic-controlled shutdown to enter ultra-low-power sleep state. Use Value: 50 µA OFF-mode current extends battery life during vehicle park mode; ±1% accuracy maintains sensor ADC reference stability. |
| Infotainment Head Unit | Advanced Driver Assistance (ADAS) Camera Module |
|
Use Scenario: Generating 5 V rail for display interface and audio codec in center console. IC Role / Device Role / Timing Role: Secondary LDO downstream of main PMIC, delivering low-noise power with fast transient response. Use Value: 50 µV RMS output noise prevents audible artifacts in audio paths; 2.2 µF stability cap saves space in dense layout. |
Use Scenario: Powering image signal processor and serializer in rear-view camera housing. IC Role / Device Role / Timing Role: Isolated 5 V supply with thermal shutdown protection against enclosure overheating. Use Value: Internal thermal limit prevents damage during sustained 85 °C ambient; RthJA = 100 °C/W enables conduction cooling via metal chassis mount. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73350PDBVR | Lower dropout (0.22 V @ 300 mA), but only AEC-Q200 rated (not Q100); 300 mA max output | Limited to non-safety-critical cabin modules; insufficient for ECU peak loads | Select when lower dropout is critical and AEC-Q100 is not mandated |
| TPS7B6750QPWPRQ1 | Higher IQ in shutdown (1 µA), wider input (4–40 V), but larger DGN package and 1.5% tolerance | Better suited for wide-input front-end regulation; less precise for ADC reference-sensitive loads | Prefer for systems requiring VIN > 16 V or sub-µA sleep current, accepting ±1.5% VO |
Compared with TLV73350PDBVR and TPS7B6750QPWPRQ1, LF50ABDT-TR uniquely balances AEC-Q100 Grade 1 compliance, ±1% output accuracy, 500 mA capability, and DPAK thermal performance-making it optimal for cost-sensitive, space-constrained ECU and BCM designs where precision and qualification are non-negotiable.
Availability
LF50ABDT-TR is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment systems requiring stable component supply across automotive production lifecycles.
Supply support for LF50ABDT-TR 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, specializing in automotive, industrial, and power management ICs with strong vertical integration and automotive qualification expertise.
The LFXX series was developed specifically for automotive power management, targeting local regulation in ECUs, ADAS, and body electronics where AEC-Q100 compliance, low dropout, and ultra-low shutdown current are essential.
FAQ
What is the maximum input voltage for LF50ABDT-TR?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown above 18 V. For normal regulation, the recommended operating input range is 6 V to 16 V - sufficient to cover automotive battery variations including cold-crank (down to ~6.5 V) and load-dump transients (clamped externally).
Does LF50ABDT-TR require an input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor must be placed as close as possible to the IN pin to ensure stability and suppress high-frequency noise. This capacitor is mandatory per the datasheet test conditions and prevents oscillation during load transients.
Can LF50ABDT-TR be used without the INH pin connected?
No - the INH pin must be actively driven. Leaving it floating may cause unpredictable enable/disable behavior. For always-on operation, tie INH to VIN through a pull-up resistor (e.g., 10 kΩ) or directly to VIN if source voltage is within 2.0–16 V and logic-high compatible.
Is the thermal pad on the DPAK package electrically connected?
Yes - the exposed thermal pad on the LF50ABDT-TR's DPAK package is internally connected to GND. It must be soldered to a PCB GND plane with adequate thermal vias to achieve specified RthJA = 100 °C/W and prevent thermal shutdown under 500 mA load.
LF50ABDT-TR 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):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF50ABDT-TR FAQ
1.How can I place an order for LF50ABDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF50ABDT-TR 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 LF50ABDT-TR reliable?
The price and inventory of LF50ABDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50ABDT-TR is usually 5 days.
3.What payment methods are accepted for LF50ABDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50ABDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF50ABDT-TR?
LF50ABDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF50ABDT-TR 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 LF50ABDT-TR?
For technical support, including LF50ABDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50ABDT-TR requirements.
6.How does Aetrix verify that LF50ABDT-TR is sourced from the original manufacturer or authorized distributors?
All LF50ABDT-TR 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 LF50ABDT-TR meets industry standards.
7.What is the process for return or replacement of LF50ABDT-TR?
All LF50ABDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF50ABDT-TR, 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 LF50ABDT-TR part is unused and in its original packaging.
Return procedure for LF50ABDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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