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

STMicroelectronics LF80CDT-TRY

Name: LF80CDT-TRY
Brand: STMicroelectronics
SKU: LF80CDT-TRY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF80CDT-TRY

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LF80CDT-TRY.pdf

Description:: IC REG LINEAR 8V 500MA DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:2,360

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Product details

Overview

LF80CDT-TRY from STMicroelectronics is a 5-pin automotive-grade low-dropout linear regulator delivering 8.0 V output at up to 500 mA, featuring 0.45 V dropout (at 200 mA), 50 µA quiescent current in OFF mode, and TTL-compatible shutdown control on pin 2. It is AEC-Q100 qualified for operation from −40 °C to 125 °C and used as a local power supply in engine control units and ADAS domain controllers.

For engineers reviewing the LF80CDT-TRY datasheet, LF80CDT-TRY pinout, LF80CDT-TRY application, or LF80CDT-TRY equivalent, key selection criteria include its 8.0 V fixed output, PPAK package thermal performance (R_thJA = 100 °C/W), shutdown logic compatibility, ±2% output tolerance at 25 °C, and minimal 2.2 µF output capacitance requirement for stability.

Technical Context

The LF80CDT-TRY implements a PMOS pass transistor architecture enabling ultra-low dropout voltage and high PSRR (82 dB at 120 Hz). Its internal current and thermal limiting protect against fault conditions without external circuitry.

Pin 2 accepts TTL-level logic signals (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) to enable or disable regulation, reducing system standby power. The device operates with input voltages from 2.8 V to 16 V and maintains regulation down to 0.4 V above V_OUT at full load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 8.0 V ±2% at 25 °C - ensures stable MCU core or sensor biasing without external feedback.
Dropout Voltage	0.45 V at 200 mA - enables operation from 8.45 V input, critical for 9–12 V automotive battery rails under cold-crank.
Quiescent Current	50 µA in OFF mode - minimizes parasitic drain during vehicle sleep states.
Output Current	500 mA continuous - supports multiple downstream ICs (e.g., CAN transceivers + microcontroller I/O).
PSRR	82 dB at 120 Hz - suppresses alternator ripple and switching noise from adjacent DC/DC converters.
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for bulky electrolytics, saving PCB area and cost.
Operating Temperature	−40 °C to 125 °C junction - meets under-hood AEC-Q100 Grade 1 requirements for engine bay placement.
Shutdown Logic	TTL-compatible (pin 2) - interfaces directly with microcontroller GPIO without level-shifting.

Pinout & Package

LF80CDT-TRY uses the PPAK (Power Package) surface-mount package with exposed thermal pad electrically connected to GND. This 5-pin configuration supports shutdown control and delivers superior thermal performance (R_thJA = 100 °C/W) versus DPAK or TO-220 alternatives.

Pin/Terminal	Circuit Role	Design Meaning
1 – IN	Input voltage supply	Accepts 2.8–16 V DC; must be decoupled with ≥0.1 µF ceramic capacitor close to pin.
2 – SHDN	Active-low shutdown control	TTL-compatible input; <0.8 V disables regulator, >2.0 V enables; draws ≤10 µA when asserted.
3 – GND	Ground reference and thermal path	Connected internally to exposed thermal pad; requires solid copper pour for heatsinking.
4 – OUT	Regulated output	Delivers 8.0 V ±2%; requires 2.2 µF ceramic capacitor (X5R/X7R) with ESR 0.1–10 Ω.
5 – NC	No connect	Internally unconnected; must remain floating - no routing or soldering permitted.

Key Features

Feature	Design Value
AEC-Q100 qualified	Grade 1 (−40 °C to 125 °C) with PAT/SYL/SBL statistical testing - certified for safety-critical automotive systems.
Low-noise regulation	50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with precision ADCs or RF receivers.
Internal protection	Thermal shutdown and current limiting - eliminates need for external foldback or thermal sensors.
Wide input range	2.8 V to 16 V operation - accommodates start-stop battery transients and 12 V nominal systems.
Minimal BOM count	Only two external capacitors required (0.1 µF input, 2.2 µF output) - reduces bill-of-materials and layout complexity.

Applications

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Powers 8-bit/32-bit microcontrollers and analog front-ends in gasoline/diesel engine management modules.

IC Role / Device Role / Timing Role: Local LDO supplying V_CORE and V_IO domains of the MCU and sensor signal conditioning circuitry.

Use Value: Maintains regulation during cold-crank (down to 6.0 V battery) due to 0.45 V dropout, ensuring uninterrupted ECU operation.

Use Scenario: Supplies radar SoCs and camera image signal processors in forward collision warning and lane departure systems.

IC Role / Device Role / Timing Role: Clean 8.0 V rail for analog power domains of mmWave radar transceivers and ISP voltage references.

Use Value: 50 µV output noise prevents spurious tones in radar IF stages; 82 dB PSRR rejects DC/DC switching coupling.

Body Control Module (BCM)

Infotainment Power Management

Use Scenario: Provides regulated power to door module MCUs, LIN transceivers, and LED drivers.

IC Role / Device Role / Timing Role: Shutdown-controlled LDO enabling selective subsystem wake-up while maintaining ultra-low sleep current.

Use Value: 50 µA OFF-mode current extends vehicle battery life during extended parking; TTL shutdown integrates with BCM wake-up logic.

Use Scenario: Generates auxiliary 8.0 V rail for display backlight drivers and audio amplifier biasing in head units.

IC Role / Device Role / Timing Role: Secondary LDO supporting non-critical infotainment peripherals independent of main 5 V/3.3 V rails.

Use Value: ±2% output tolerance ensures consistent LED brightness and amplifier gain across temperature; PPAK package allows compact placement near loads.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output automotive LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV73380PDBVR	8.0 V, 300 mA, 250 mV dropout, SOT-23-5 package, R_thJA = 210 °C/W	Limited to ambient-temp-only industrial use; not AEC-Q100 qualified	Select only for non-automotive, space-constrained designs where thermal derating permits 300 mA at 85 °C ambient.
TPS7B8780QKVURQ1	8.0 V, 500 mA, 300 mV dropout, 35 µA quiescent current, WSON-10 package	Higher PSRR (85 dB @ 120 Hz), but requires 4.7 µF output cap and external enable pull-up	Prefer when lowest possible noise and higher PSRR outweigh board space penalty of larger capacitor and extra resistor.

Compared with TLV73380PDBVR, LF80CDT-TRY provides automotive qualification and 200 mA higher current capacity; compared with TPS7B8780QKVURQ1, it achieves stable operation with half the output capacitance and simpler enable interface, at the cost of slightly lower PSRR.

Availability

LF80CDT-TRY is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and infotainment systems requiring stable component supply across automotive production lifecycles.

Supply support for LF80CDT-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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

LFXX regulators belong to ST's automotive-qualified linear regulator product line, engineered specifically for robust, low-noise local power delivery in harsh-temperature vehicle subsystems.

FAQ

What is the maximum input voltage for LF80CDT-TRY?

The absolute maximum DC input voltage is 40 V, but regulation is only guaranteed between 2.8 V and 16 V. Input voltages above 18 V force the device into shutdown mode per Table 1 of the datasheet, protecting downstream circuitry during load-dump transients.

Does LF80CDT-TRY require an input capacitor?

Yes - a minimum 0.1 µF ceramic capacitor must be placed within 5 mm of the IN pin to ensure stability and suppress high-frequency noise. Larger values (e.g., 1 µF) improve transient response but are not mandatory for basic operation.

Can LF80CDT-TRY be used without connecting the SHDN pin?

No - pin 2 (SHDN) must be actively driven. Leaving it floating may cause erratic enable/disable behavior. For always-on operation, tie SHDN to IN through a 10 kΩ resistor or drive it high with a GPIO; do not leave unconnected.

Is the exposed thermal pad on the PPAK package electrically isolated?

No - the exposed pad is internally connected to GND. It must be soldered to a dedicated GND plane with ≥4 thermal vias (0.3 mm diameter) to achieve rated thermal performance (R_thJA = 100 °C/W); failure to do so risks thermal shutdown under load.

LF80CDT-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):: 8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.3V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 2.5 mA

Current - Supply (Max):: 12 mA

PSRR:: 72dB ~ 57dB (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

LF80CDT-TRY FAQ

1.How can I place an order for LF80CDT-TRY through Aetrix?

Please submit a Request for Quotation (RFQ) for LF80CDT-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 LF80CDT-TRY reliable?

The price and inventory of LF80CDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF80CDT-TRY is usually 5 days.

3.What payment methods are accepted for LF80CDT-TRY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF80CDT-TRY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF80CDT-TRY?

LF80CDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF80CDT-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 LF80CDT-TRY?

For technical support, including LF80CDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF80CDT-TRY requirements.

6.How does Aetrix verify that LF80CDT-TRY is sourced from the original manufacturer or authorized distributors?

All LF80CDT-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 LF80CDT-TRY meets industry standards.

7.What is the process for return or replacement of LF80CDT-TRY?

All LF80CDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF80CDT-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 LF80CDT-TRY part is unused and in its original packaging.

Return procedure for LF80CDT-TRY:

1.Submit a request within 90 days.

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

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