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STMicroelectronics LF18CDT-TRY
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- Part No.:
- LF18CDT-TRY
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF18CDT-TRY.pdf
- Description:
- IC REG LINEAR 1.8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
LF18CDT-TRY from STMicroelectronics is a 1.8 V, ±2% tolerance automotive-grade low-dropout linear regulator in DPAK package, delivering up to 500 mA output current with 0.7 V dropout at 200 mA, 50 µA quiescent current in OFF mode, and AEC-Q100 qualification for use in engine control units and ADAS power rails.
For engineers reviewing the LF18CDT-TRY datasheet, LF18CDT-TRY pinout, LF18CDT-TRY application, or LF18CDT-TRY equivalent, this device is selected for battery-powered automotive subsystems requiring stable 1.8 V supply, logic-controlled shutdown, and operation from −40 °C to 125 °C junction temperature.
Technical Context
The LF18CDT-TRY implements a PNP pass transistor architecture enabling very low dropout voltage (0.7 V typ. at 200 mA) while maintaining internal thermal and current limiting. Its TTL-compatible inhibit input (Pin 2) enables precise system-level power sequencing in multi-rail automotive ECUs.
It operates across 3 V to 16 V input range, supports 2.2 µF ceramic output capacitance with ESR 0.1–10 Ω, and delivers 82 dB supply voltage rejection at 120 Hz-critical for noise-sensitive microcontroller core supplies in noisy vehicle electrical environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 1.8 V ±2% at 25 °C; maintains regulation across full automotive temp range (−40 to 125 °C) |
| Dropout voltage | 0.7 V typical at 200 mA; enables operation with minimal headroom (e.g., 2.5 V input → 1.8 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 ARM Cortex-M7 cores or CAN transceivers |
| Input voltage range | 3 V to 16 V; compatible with 12 V battery systems including load dump transients |
| SVR @ 120 Hz | 82 dB typical; suppresses alternator ripple and switching noise on MCU VDD lines |
| Thermal shutdown | Integrated protection triggers above 160 °C junction temperature; prevents latch-up during overload |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad electrically connected to GND; 3-pin configuration (Input, GND, Output) - no inhibit function in this variant per datasheet Figure 2 and ordering code suffix "DT".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | DC input supply connection; accepts 3–16 V; requires local 0.1 µF ceramic decoupling |
| Pin 2 (GND) | Ground | Power and control reference; tied to exposed thermal pad for thermal conduction |
| Pin 3 (Output) | VOUT | Regulated 1.8 V output; stable with ≥2.2 µF ceramic capacitor (ESR 0.1–10 Ω) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified for automotive applications per Grade 1 (−40 to 125 °C), including PAT/SYL/SBL statistical testing |
| Low dropout | 0.7 V typical at 200 mA enables use in low-headroom 12 V battery systems with aging or cold-cranking derating |
| Ultra-low quiescent current | 50 µA in OFF mode supports >10-year battery life in telematics sleep states |
| Stable with small capacitor | Only 2.2 µF ceramic output cap required; eliminates need for bulky tantalum or electrolytic capacitors |
| Internal protection | Current limit + thermal shutdown prevent damage during short-circuit or PCB overheating events |
Applications
| Engine Control Unit (ECU) Core Supply | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers 1.8 V I/O or core rail of automotive microcontrollers (e.g., SPC58ECxx) in engine bay environments. IC Role / Device Role / Timing Role: Primary local LDO providing clean, regulated 1.8 V for MCU core logic under wide input voltage and temperature variation. Use Value: AEC-Q100 qualification and −40 to 125 °C operation ensure functional safety compliance without external thermal derating. | Use Scenario: Supplies image sensor interface and ISP core in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Low-noise 1.8 V source for high-speed MIPI CSI-2 receiver blocks requiring stable voltage during vibration and thermal cycling. Use Value: 50 µV RMS output noise and 82 dB SVR preserve signal integrity in analog front-end paths. |
| Body Control Module (BCM) Subsystem | Automotive Infotainment SoC I/O Rail |
Use Scenario: Powers LIN transceiver, EEPROM, and low-power logic in door module or seat controller. IC Role / Device Role / Timing Role: Always-on LDO supporting wake-on-LIN functionality with ultra-low OFF-mode current. Use Value: 50 µA quiescent current in shutdown extends vehicle battery life during extended parking periods. | Use Scenario: Provides 1.8 V I/O supply for application processors (e.g., i.MX8QXP) in head unit designs. IC Role / Device Role / Timing Role: Secondary LDO decoupling SoC I/O domain from noisy DC/DC converter outputs. Use Value: 2.2 µF ceramic stability reduces board area and cost versus traditional 10–22 µF tantalum solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73318PDBVR | Lower dropout (0.22 V @ 300 mA), but only 300 mA rated; not AEC-Q100 qualified | Suitable for non-automotive portable devices; lacks automotive reliability testing and extended temp support | Select only for industrial or consumer designs where AEC-Q100 and 125 °C operation are not required |
| NCP1117ST18T3G | Higher dropout (1.2 V @ 800 mA), 1.5% initial accuracy, no inhibit function, TO-220 package | Used in legacy automotive body electronics; larger footprint and higher thermal resistance than DPAK | Prefer when existing thermal design uses TO-220 heatsinking and AEC-Q100 is not mandated |
Compared with TLV73318PDBVR and NCP1117ST18T3G, the LF18CDT-TRY uniquely combines AEC-Q100 Grade 1 qualification, DPAK thermal efficiency (RthJA = 100 °C/W), and 500 mA capability in a 1.8 V ±2% automotive LDO - making it optimal for new ECU and ADAS designs requiring compact, qualified, high-current regulation.
Availability
LF18CDT-TRY is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and body electronics requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for LF18CDT-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, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade components.
The LFXX series was developed specifically for automotive power management, targeting high-reliability, low-dropout regulation in engine control, infotainment, and driver-assistance systems with stringent AEC-Q100 and thermal requirements.
FAQ
What is the maximum input voltage for LF18CDT-TRY?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown for inputs above 18 V. For normal regulation, the recommended operating input range is 3 V to 16 V - sufficient to cover automotive battery variations including cold-crank (down to ~6 V) and load dump (up to 16 V).
Does LF18CDT-TRY include an enable/inhibit pin?
No. The LF18CDT-TRY uses the 3-pin DPAK configuration (VIN, GND, VOUT) and lacks the inhibit function. That feature is only present in the 5-pin PPAK variants (e.g., LF18CDTR-TRY). This part is always-on unless externally disabled via input disconnection or upstream switch.
What output capacitor is required for stability?
A minimum 2.2 µF ceramic capacitor with ESR between 0.1 Ω and 10 Ω is required at the output. STMicroelectronics validates stability with X5R/X7R dielectrics; no additional series resistance or parallel capacitor is needed, simplifying layout and reducing BOM count.
Is LF18CDT-TRY compliant with AEC-Q100?
Yes. LF18CDT-TRY is fully AEC-Q100 qualified for Grade 1 (−40 °C to +125 °C ambient), including stress tests PAT, SYL, and SBL. It is intended for automotive power rails where reliability and long-term parametric stability are mandatory.
LF18CDT-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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 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
LF18CDT-TRY FAQ
1.How can I place an order for LF18CDT-TRY through Aetrix?
Please submit a Request for Quotation (RFQ) for LF18CDT-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 LF18CDT-TRY reliable?
The price and inventory of LF18CDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF18CDT-TRY is usually 5 days.
3.What payment methods are accepted for LF18CDT-TRY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF18CDT-TRY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF18CDT-TRY?
LF18CDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF18CDT-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 LF18CDT-TRY?
For technical support, including LF18CDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF18CDT-TRY requirements.
6.How does Aetrix verify that LF18CDT-TRY is sourced from the original manufacturer or authorized distributors?
All LF18CDT-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 LF18CDT-TRY meets industry standards.
7.What is the process for return or replacement of LF18CDT-TRY?
All LF18CDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF18CDT-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 LF18CDT-TRY part is unused and in its original packaging.
Return procedure for LF18CDT-TRY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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