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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LF50ABDT-TRY

Name: LF50ABDT-TRY
Brand: STMicroelectronics
SKU: LF50ABDT-TRY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF50ABDT-TRY

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LF50ABDT-TRY.pdf

Description:: IC REG LINEAR 5V 500MA DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LF50ABDT-TRY from STMicroelectronics is a 5.0 V, ±1% tolerance automotive-grade low-dropout linear regulator in DPAK package, delivering up to 500 mA output current with 0.4 V dropout at 500 mA and 50 µA quiescent current in shutdown mode. It features logic-controlled inhibit (TTL-compatible), internal thermal/current limiting, and stable operation with only 2.2 µF output capacitance - designed for engine control units and ADAS power rails.

For engineers reviewing the LF50ABDT-TRY datasheet, LF50ABDT-TRY pinout, LF50ABDT-TRY application, or LF50ABDT-TRY equivalent, key selection criteria include automotive AEC-Q100 qualification (-40 °C to 125 °C), 76 dB supply rejection at 120 Hz, 5 mV load regulation (5–500 mA), and DPAK thermal resistance of 100 °C/W (junction-to-ambient).

Technical Context

The LF50ABDT-TRY implements a PNP-based LDO architecture with integrated shutdown control via Pin 2 (INH), enabling system-level power gating. Its feedback loop is internally compensated for stability with ≥2.2 µF ceramic output capacitors (ESR 0.1–10 Ω), eliminating need for external compensation components.

It operates across 6–16 V input range and maintains regulated 5.0 V output under full 500 mA load within ±1% accuracy over -40 °C to 125 °C, meeting AEC-Q100 Grade 1 requirements. Shutdown mode reduces quiescent current to 50 µA typ., while ON-mode current is 500 µA typ. at no load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5.0 V ±1% at 25 °C - ensures precise MCU core or sensor rail regulation without external trimming
Dropout voltage	0.4 V at 500 mA - enables operation from 5.4 V input in cold-crank automotive scenarios
Quiescent current	50 µA in OFF mode - minimizes battery drain during vehicle sleep states
Output current	500 mA continuous - supports multiple downstream ICs (e.g., CAN transceivers + microcontroller)
Supply rejection	76 dB at 120 Hz - suppresses alternator ripple and ignition noise on 12 V systems
Thermal resistance	100 °C/W (J-A, DPAK) - requires minimal copper area for thermal management in compact ECUs
Stability capacitor	2.2 µF ceramic (ESR 0.1–10 Ω) - reduces BOM count and PCB footprint vs. traditional 10–22 µF tantalum

Pinout & Package

DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND; 3-pin configuration (Input, Output, GND) - no inhibit function in this variant (LF50ABDT-TRY is fixed-output, non-shutdown version per ordering code suffix "DT" and absence of Pin 2 control terminal in DPAK 3-pin layout).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	V_IN	Accepts 6–16 V unregulated automotive supply; must be decoupled with ≥0.1 µF ceramic near pin
Pin 2 (Output)	V_OUT	Regulated 5.0 V output; connects directly to load and 2.2 µF stability capacitor
Pin 3 (Tab/GND)	GND	Power ground and thermal path; requires ≥200 mm² copper pour for thermal performance

Key Features

Feature	Design Value
AEC-Q100 qualified	Grade 1 (-40 °C to +125 °C junction), PAT/SYL/SBL tested - certified for powertrain and chassis applications
Low dropout	0.4 V @ 500 mA - extends functional battery voltage down to 5.4 V during cold cranking
Ultra-low shutdown current	50 µA typ. - meets ISO 16750-2 quiescent current limits for always-on ECU modules
Internal protection	Thermal shutdown + current limit - eliminates need for external foldback circuitry in harsh environments
Capacitor-optimized stability	Works with 2.2 µF ceramic (0.1–10 Ω ESR) - avoids costly tantalum and simplifies layout

Applications

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Powers 32-bit MCU, CAN controller, and analog front-end in gasoline/diesel engine management systems.

IC Role / Device Role / Timing Role: Primary 5 V local regulator for safety-critical digital logic and sensor interface circuits.

Use Value: Maintains regulation during 6–16 V battery transients and cold-crank dips to 6.5 V, ensuring uninterrupted MCU operation.

Use Scenario: Supplies radar SoC and camera image signal processor in forward collision warning modules.

IC Role / Device Role / Timing Role: Clean, low-noise 5 V rail for high-speed digital interfaces and precision ADC references.

Use Value: 50 µV RMS output noise and 76 dB PSRR suppress switching noise from adjacent DC/DC converters.

Body Control Module (BCM)

Infotainment Power Sequencing

Use Scenario: Regulates power for door module microcontrollers and LIN transceivers in centralized body electronics.

IC Role / Device Role / Timing Role: Secondary LDO providing isolated 5 V domain with independent fault containment.

Use Value: Internal current limit prevents single-point failure from shorted downstream loads in distributed architectures.

Use Scenario: Generates controlled 5 V enable signal for main PMIC sequencing in head unit designs.

IC Role / Device Role / Timing Role: Voltage supervisor + regulator for deterministic power-up timing of multi-rail SoCs.

Use Value: Stable 5 V output ensures accurate reset assertion and avoids brown-out resets during startup.

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	300 mA output, 170 mV dropout @ 300 mA, SOT-23-5 package, no AEC-Q100	Limited to infotainment peripherals; not qualified for powertrain or ADAS	Select only for non-safety-critical cabin modules where space is constrained
TPS7B6950QDCYRQ1	500 mA, 300 mV dropout @ 500 mA, 60 dB PSRR @ 1 kHz, AEC-Q100 Grade 1	Higher PSRR at high frequencies but lower low-frequency rejection (60 dB vs. 76 dB at 120 Hz)	Prefer when switching noise >1 kHz dominates; LF50ABDT-TRY better for alternator ripple suppression

Compared with TLV73350PDBVR and TPS7B6950QDCYRQ1, the LF50ABDT-TRY delivers superior low-frequency PSRR for automotive battery ripple suppression, wider input range (6–16 V), and proven thermal robustness in DPAK - making it optimal for ECU and ADAS main rail regulation where reliability trumps miniaturization.

Availability

LF50ABDT-TRY is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for LF50ABDT-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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The LFXX series was developed specifically for automotive power management, emphasizing AEC-Q100 compliance, ultra-low quiescent current, and ruggedized thermal performance in TO-220, DPAK, and PPAK packages.

FAQ

What is the maximum input voltage for LF50ABDT-TRY?

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 - covering nominal 12 V automotive systems including cold-crank (6.5 V) and load-dump (up to 16 V) conditions per ISO 7637-2.

Does LF50ABDT-TRY require an input bypass capacitor?

Yes - a minimum 0.1 µF ceramic capacitor must be placed as close as possible to the IN pin and GND. This stabilizes the input impedance during transient load steps and prevents oscillation caused by source inductance in long harness-fed automotive wiring.

Is the thermal pad on the DPAK package electrically connected?

Yes - the exposed thermal tab (Pin 3) is internally connected to GND. It must be soldered to a dedicated GND plane with ≥4 thermal vias (0.3 mm diameter) to achieve the specified 100 °C/W junction-to-ambient thermal resistance and prevent thermal shutdown under full 500 mA load.

Can LF50ABDT-TRY be used in non-automotive applications?

Yes - its electrical specifications (5 V ±1%, 500 mA, -40 °C to +125 °C) remain valid outside automotive use. However, AEC-Q100 qualification testing (PAT/SYL/SBL) provides added confidence for industrial or medical applications demanding high reliability, though formal certification for those sectors requires separate validation.

LF50ABDT-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

LF50ABDT-TRY FAQ

1.How can I place an order for LF50ABDT-TRY through Aetrix?

Please submit a Request for Quotation (RFQ) for LF50ABDT-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 LF50ABDT-TRY reliable?

The price and inventory of LF50ABDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50ABDT-TRY is usually 5 days.

3.What payment methods are accepted for LF50ABDT-TRY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50ABDT-TRY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF50ABDT-TRY?

LF50ABDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF50ABDT-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 LF50ABDT-TRY?

For technical support, including LF50ABDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50ABDT-TRY requirements.

6.How does Aetrix verify that LF50ABDT-TRY is sourced from the original manufacturer or authorized distributors?

All LF50ABDT-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 LF50ABDT-TRY meets industry standards.

7.What is the process for return or replacement of LF50ABDT-TRY?

All LF50ABDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF50ABDT-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 LF50ABDT-TRY part is unused and in its original packaging.

Return procedure for LF50ABDT-TRY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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