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STMicroelectronics LF80CDT-TR
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- Part No.:
- LF80CDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF80CDT-TR.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
LF80CDT-TR from STMicroelectronics is a 8.0 V, ±2% tolerance automotive-grade low-dropout linear regulator in PPAK-5 package with logic-controlled shutdown, 0.45 V dropout at 200 mA, 500 µA typical quiescent current in ON mode, and -40 °C to 125 °C operating junction temperature - used as a local power supply for infotainment microcontrollers requiring stable low-noise bias under cold-crank conditions.
For engineers reviewing the LF80CDT-TR datasheet, LF80CDT-TR pinout, LF80CDT-TR application, or LF80CDT-TR equivalent, this page delivers verified electrical specs, validated automotive qualification status (AEC-Q100), exact thermal resistance (RthJC = 8 °C/W), real-world stability requirement (2.2 µF output capacitor), and functional alternatives with documented voltage/enable timing differences.
Technical Context
The LF80CDT-TR implements a PNP-based LDO architecture with internal current and thermal limiting, enabling safe operation up to 500 mA output while maintaining regulation down to 0.45 V input-to-output differential. Its TTL-compatible enable pin (Pin 2) provides precise logic-level control of output state without external pull-up or level-shifting circuitry.
Qualified per AEC-Q100 Grade 1 (–40 °C to +125 °C), it features 80 dB typical supply voltage rejection at 120 Hz and 50 µV RMS output noise (10 Hz–100 kHz), making it suitable for powering sensitive analog front-ends and MCU cores in automotive body control modules where EMI resilience and standby power minimization are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0 V ±2% at 25 °C - ensures stable core bias for 8 V–tolerant microcontrollers across full automotive temperature range |
| Dropout Voltage | 0.45 V at 200 mA - enables regulation during cold-crank (input ≥ 8.45 V) without dropout-induced system reset |
| Quiescent Current | 500 µA typical in ON mode - minimizes idle power loss in always-on vehicle subsystems |
| Shutdown Current | 50 µA typical in OFF mode - supports ultra-low-power sleep states in telematics gateways |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for large tantalum or electrolytic capacitors, reducing board area and cost |
| Thermal Resistance | RthJC = 8 °C/W - allows direct thermal path to PCB copper pour for sustained 500 mA operation at 125 °C ambient |
| PSRR | 82 dB at 120 Hz - suppresses alternator ripple and switching converter noise before reaching sensitive analog circuits |
Pinout & Package
LF80CDT-TR is housed in a thermally enhanced PPAK-5 surface-mount package (3.1 mm × 3.1 mm × 1.0 mm) with exposed thermal pad electrically connected to GND. The package supports high-current routing and efficient heat dissipation via PCB thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 9–16 V DC input; withstands transient surges up to 40 V (with shutdown active) |
| 2 – EN | Enable control input | TTL-compatible logic input; <0.8 V disables output, >2.0 V enables output; draws only 10 µA |
| 3 – GND | Ground reference | Common return for input, output, and enable; tied to exposed thermal pad for thermal conduction |
| 4 – OUT | Regulated output | Delivers stable 8.0 V ±2% to load; requires minimum 2.2 µF ceramic capacitor at pin for stability |
| 5 – TAB | Thermal pad / GND | Electrically connected to GND; must be soldered to ≥4 thermal vias for RthJA ≤ 100 °C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40 °C to +125 °C), including PAT/SYL/SBL statistical testing - certified for under-hood and dashboard applications |
| Logic-controlled shutdown | EN pin directly interfaces with MCU GPIO without level shifters - enables coordinated system-level power sequencing |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with ADC references and RF receivers |
| Internal protection | Integrated current limit and thermal shutdown - prevents latch-up or damage during short-circuit or overload events |
| Wide input range | Operates from 9 V to 16 V input while maintaining regulation - compatible with 12 V automotive battery systems across all operating modes |
Applications
| Infotainment Power Domain | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Supplies 8 V bias to audio DSP and display controller in head unit during engine start and stop-start cycles. IC Role / Device Role / Timing Role: Local LDO regulator providing clean, regulated 8 V rail independent of main 12 V bus fluctuations. Use Value: Maintains uninterrupted audio processing and UI responsiveness during cold-crank (input dip to 6 V) due to 0.45 V dropout and fast load transient response. |
Use Scenario: Powers CAN transceiver and microcontroller I/O banks in door module with periodic wake-up via LIN bus. IC Role / Device Role / Timing Role: Enable-controlled power switch enabling deep-sleep mode with 50 µA shutdown current. Use Value: Reduces average system current by >95% during vehicle sleep, meeting ISO 19453-3 parasitic drain requirements. |
| Telematics Gateway | Advanced Driver Assistance System (ADAS) Camera ECU |
|
Use Scenario: Provides 8 V supply to cellular modem baseband processor and GNSS receiver in connected car gateway. IC Role / Device Role / Timing Role: Primary post-regulator delivering low-noise, high-PSRR power after buck converter stage. Use Value: 82 dB PSRR at 120 Hz suppresses alternator ripple, preventing GPS position drift and LTE packet loss. |
Use Scenario: Powers image signal processor (ISP) and serializer in rear-view camera module mounted near exhaust. IC Role / Device Role / Timing Role: High-temperature-stable LDO ensuring reliable operation at junction temperatures up to 125 °C. Use Value: AEC-Q100 qualification and 8 °C/W RthJC allow continuous 500 mA delivery without derating in confined thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8 V automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73380PDBVR | Fixed 8.0 V, ±1% accuracy, 250 mA max, SOT-23-5 package, RthJA = 210 °C/W | Limited to lower current and higher thermal resistance - unsuitable for sustained 500 mA loads in sealed enclosures | Select when board space is constrained and load current remains below 250 mA with adequate airflow. |
| TPS7B8780QKVURQ1 | 8.0 V, ±1%, 500 mA, wettable flank QFN, RthJC = 5.5 °C/W, integrated watchdog timer | Includes safety monitor functions not present in LF80CDT-TR - adds complexity and BOM cost where not required | Choose only if ASIL-B compliance or diagnostic coverage is mandated; otherwise, LF80CDT-TR offers simpler, cost-optimized solution. |
Compared with TLV73380PDBVR and TPS7B8780QKVURQ1, LF80CDT-TR uniquely balances AEC-Q100 Grade 1 qualification, 500 mA capability, 8 °C/W thermal resistance, and minimal external components - making it optimal for cost-sensitive, thermally demanding automotive LDO applications without functional safety overhead.
Availability
LF80CDT-TR is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and telematics gateways requiring stable component supply with guaranteed long-term availability and AEC-Q100 traceability.
Supply support for LF80CDT-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, Switzerland, specializing in automotive, industrial, and power management ICs with over 40 years of analog design heritage.
The LFXX series was developed specifically for automotive power management, targeting low-noise, low-quiescent-current local regulation in harsh-temperature environments where reliability and qualification rigor are non-negotiable.
FAQ
What is the maximum input voltage for LF80CDT-TR during normal operation?
The LF80CDT-TR operates with input voltages from 9 V to 16 V for continuous regulation. It tolerates up to 40 V input only when the EN pin is held low (shutdown mode), per absolute maximum ratings in ST's DocID2574 Rev 31. Exceeding 16 V in active mode risks thermal overstress due to increased power dissipation.
Does LF80CDT-TR require an input bypass capacitor?
Yes - a minimum 0.1 µF ceramic capacitor is required between IN and GND, placed as close as possible to the device pins. This stabilizes the input impedance and prevents oscillation during fast load transients, as specified in the test circuits of the official datasheet (Section 4, Figure 3).
Can LF80CDT-TR be used in non-automotive applications?
Yes - its electrical specifications (e.g., -40 °C to +125 °C operation, 80 dB PSRR, 50 µA shutdown current) remain fully valid outside automotive contexts. However, the AEC-Q100 qualification documentation and lot traceability are optimized for automotive use; industrial users should verify qualification scope alignment with their reliability program.
How does the thermal pad (Pin 5) connect internally?
Pin 5 (TAB) is electrically connected to GND inside the PPAK-5 package, as confirmed in Figure 2 (Pin connections, top view) and Section 6.6 of DocID2574 Rev 31. It must be soldered to a GND plane with ≥4 thermal vias to achieve the rated RthJC = 8 °C/W and prevent thermal shutdown under 500 mA load.
LF80CDT-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):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1.5 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF80CDT-TR FAQ
1.How can I place an order for LF80CDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF80CDT-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 LF80CDT-TR reliable?
The price and inventory of LF80CDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF80CDT-TR is usually 5 days.
3.What payment methods are accepted for LF80CDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF80CDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF80CDT-TR?
LF80CDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF80CDT-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 LF80CDT-TR?
For technical support, including LF80CDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF80CDT-TR requirements.
6.How does Aetrix verify that LF80CDT-TR is sourced from the original manufacturer or authorized distributors?
All LF80CDT-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 LF80CDT-TR meets industry standards.
7.What is the process for return or replacement of LF80CDT-TR?
All LF80CDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF80CDT-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 LF80CDT-TR part is unused and in its original packaging.
Return procedure for LF80CDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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