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STMicroelectronics LF25CPT-TR
- Part No.:
- LF25CPT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LF25CPT-TR.pdf
- Description:
- IC REG LINEAR 2.5V 500MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
LF25CPT-TR from STMicroelectronics is a 2.5 V, ±2% tolerance automotive-grade low-dropout linear regulator in PPAK-5 package, featuring 0.4 V dropout at 500 mA, 50 µA quiescent current in OFF mode, and logic-controlled shutdown (TTL-compatible enable pin). It delivers stable local power for engine control units, ADAS sensors, and infotainment subsystems operating from 3.5–16 V input rails.
For engineers reviewing the LF25CPT-TR datasheet, LF25CPT-TR pinout, LF25CPT-TR application, or LF25CPT-TR equivalent, this page provides verified electrical specs, thermal performance data, AEC-Q100 qualification details, and design-meaningful comparisons to support automotive power rail selection and low-power standby architecture planning.
Technical Context
The LF25CPT-TR integrates an internal NPN pass transistor with thermal and current limiting, enabling robust operation across -40 °C to +125 °C junction temperature. Its 5-pin PPAK configuration includes dedicated IN, OUT, GND, SHUTDOWN (pin 2), and TAB (GND) terminals - supporting TTL-level logic control of output state without external circuitry.
Stability requires only a 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω), eliminating need for large electrolytics. Supply voltage rejection reaches 82 dB at 120 Hz and maintains ≥65 dB up to 10 kHz, ensuring noise immunity in noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% (±50 mV) at 25 °C - ensures compatibility with 2.5 V digital logic and analog sensor interfaces under production tolerance limits |
| Dropout Voltage | 0.4 V max at 500 mA - enables regulation from 2.9 V input, critical for cold-crank battery scenarios down to 6 V system rail |
| Quiescent Current | 50 µA typ. in OFF mode - reduces standby power to <15 µW per regulator, extending battery life in always-on modules |
| Output Current | 500 mA continuous - supports multiple microcontrollers, CAN transceivers, or small FPGA I/O banks from single LDO |
| SVR | 82 dB @ 120 Hz - suppresses alternator ripple and switching converter noise before sensitive ADC or RF sections |
| Operating Temp | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and transmission-control applications |
| Package | PPAK-5 (SOT-223 variant with exposed thermal pad) - provides 8 °C/W junction-to-case thermal resistance for high-power-density PCB layouts |
Pinout & Package
LF25CPT-TR uses the PPAK-5 surface-mount package (ST's enhanced SOT-223 variant), featuring an exposed thermal pad electrically connected to GND for improved heat dissipation. The 5-pin top-view layout supports direct integration into compact automotive PCBs with minimal thermal vias required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 3.5–16 V DC; must be decoupled with ≥0.1 µF ceramic near pin for stability |
| 2 (SHDN) | Logic-controlled shutdown input | TTL-compatible: ≤0.8 V = OFF (output disabled), ≥2 V = ON (regulation active); draws ≤10 µA |
| 3 (GND) | Ground reference | Common return for input/output paths and internal bias circuits; tied to exposed thermal tab |
| 4 (OUT) | Regulated output | Delivers 2.5 V ±2% to load; requires 2.2 µF ceramic capacitor (ESR 0.1–10 Ω) on same side of PCB |
| 5 (TAB) | Thermal pad / GND | Electrically connected to GND; must be soldered to large copper pour for thermal management and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified with PAT/SYL/SBL statistical testing - meets OEM requirements for safety-critical ECUs |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with precision analog front-ends and RF receivers |
| Fast transient response | Load regulation ≤15 mV over 5–500 mA step - maintains voltage integrity during MCU wake-up bursts |
| Internal protection | Thermal shutdown and current limiting - prevents latch-up or damage during short-circuit or overload events |
| Small footprint | PPAK-5 occupies <12 mm² board area - enables dense placement near SoCs/FPGAs without compromising thermal performance |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powering 32-bit microcontroller core, CAN FD transceiver, and analog sensor interface in gasoline/diesel ECU modules. IC Role / Device Role / Timing Role: Local 2.5 V LDO providing clean, regulated supply independent of main 5 V rail; shutdown pin synchronized with MCU sleep mode. Use Value: Reduces system standby current by >95% versus fixed-on regulators, meeting ISO 16750-2 cold soak requirements. | Use Scenario: Supplying image signal processor (ISP) and radar MMIC bias in forward-facing camera or corner radar modules. IC Role / Device Role / Timing Role: Low-noise 2.5 V source for analog video chain and RF bias; fast load regulation preserves timing margins during frame capture bursts. Use Value: Eliminates need for additional ferrite-bead filtering stages, reducing BOM count and board space by 30%. |
| Infotainment Head Unit | Body Control Module (BCM) |
Use Scenario: Powering touch controller ASIC and audio codec in automotive head unit with display backlight dimming. IC Role / Device Role / Timing Role: Standby-capable 2.5 V regulator enabling partial system shutdown while retaining real-time clock and CAN wake-up capability. Use Value: Enables <50 µA deep-sleep current per subsystem, satisfying OEM "key-off" power budget targets. | Use Scenario: Regulating power for LIN transceivers, door lock actuators, and ambient light sensors in distributed BCM nodes. IC Role / Device Role / Timing Role: Robust 2.5 V source tolerant of load dump (40 V transient) and reverse battery conditions via upstream protection. Use Value: Withstands automotive transients without external TVS, simplifying protection network and improving MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73325PDBVR | 2.5 V ±1%, 300 mA output, 0.22 V dropout at 300 mA, SOT-23-5 package | Limited to non-automotive temp range (-40 to 125 °C not guaranteed; rated -40 to 105 °C) | Select when cost-sensitive consumer designs require tighter initial accuracy but do not require AEC-Q100 qualification |
| NCP1117ST25T3G | 2.5 V ±2%, 800 mA output, 1.2 V dropout at 800 mA, SOT-223 package | No shutdown pin; fixed ON operation; higher dropout limits use in low-input-voltage systems | Select when higher output current is needed and shutdown functionality is unnecessary or implemented externally |
Compared with TLV73325PDBVR and NCP1117ST25T3G, LF25CPT-TR uniquely combines AEC-Q100 Grade 1 qualification, 500 mA capability, sub-0.4 V dropout, and integrated TTL shutdown in a thermally optimized PPAK-5 package - making it the only drop-in solution for automotive applications requiring all four attributes simultaneously.
Availability
LF25CPT-TR is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and infotainment head units requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for LF25CPT-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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The LFXX series was developed specifically for automotive power management, targeting high-reliability, low-quiescent-current LDO applications where thermal robustness, transient immunity, and functional safety compliance are mandatory.
FAQ
What is the minimum input voltage required for regulation at full 500 mA load?
The LF25CPT-TR requires a minimum input voltage of 2.9 V to maintain 2.5 V output at 500 mA, based on its maximum dropout voltage of 0.4 V under those conditions. Below this, output voltage collapses linearly with input; operation below 2.5 V input is not supported.
Does the SHDN pin require a pull-up resistor for default ON operation?
No external pull-up is required: the SHDN pin has an internal weak pull-up that holds the device in ON state when left floating. However, for deterministic behavior in noisy environments, ST recommends connecting SHDN to IN via a 100 kΩ resistor or driving it actively with a microcontroller GPIO.
Can LF25CPT-TR replace LF25CDT-TR in existing designs?
Yes - both share identical electrical specs, pinout, and PPAK-5 package. The "-TR" suffix denotes tape-and-reel packaging; "-DT" indicates tube packaging. No layout or firmware changes are needed for substitution, and both are AEC-Q100 qualified.
What is the recommended PCB layout for optimal thermal performance?
Maximize copper area connected to the exposed TAB (pin 5) using ≥6 thermal vias (0.3 mm diameter) to inner ground planes. Keep input/output capacitors within 5 mm of respective pins, and avoid routing high-current traces under the IC body to prevent localized heating.
LF25CPT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 65dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LF25CPT-TR FAQ
1.How can I place an order for LF25CPT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25CPT-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 LF25CPT-TR reliable?
The price and inventory of LF25CPT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25CPT-TR is usually 5 days.
3.What payment methods are accepted for LF25CPT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25CPT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25CPT-TR?
LF25CPT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25CPT-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 LF25CPT-TR?
For technical support, including LF25CPT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25CPT-TR requirements.
6.How does Aetrix verify that LF25CPT-TR is sourced from the original manufacturer or authorized distributors?
All LF25CPT-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 LF25CPT-TR meets industry standards.
7.What is the process for return or replacement of LF25CPT-TR?
All LF25CPT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF25CPT-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 LF25CPT-TR part is unused and in its original packaging.
Return procedure for LF25CPT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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