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STMicroelectronics LF25CDT-TRY
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- Part No.:
- LF25CDT-TRY
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF25CDT-TRY.pdf
- Description:
- IC REG LINEAR 2.5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,276
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Product details
Overview
LF25CDT-TRY from STMicroelectronics is a 2.5 V, ±2% tolerance automotive-grade low-dropout linear regulator in PPAK-5 package with 500 mA output current capability, 0.4 V typical dropout at 500 mA, and logic-controlled shutdown (TTL-compatible enable pin). It operates from -40 °C to 125 °C and is qualified per AEC-Q100 for use as a local power rail in engine control units and ADAS domain controllers.
For engineers reviewing the LF25CDT-TRY datasheet, LF25CDT-TRY pinout, LF25CDT-TRY application, or LF25CDT-TRY equivalent, this device is selected for battery-powered automotive subsystems requiring ultra-low quiescent current (50 µA in OFF mode), high PSRR (82 dB at 120 Hz), and minimal external capacitance (2.2 µF ceramic).
Technical Context
The LF25CDT-TRY implements a PNP pass transistor architecture enabling very low dropout voltage (0.4 V typ. at 500 mA) and stable regulation across wide input ranges (3.5–16 V). Its internal current and thermal limiting protect against fault conditions without external circuitry.
It features a dedicated TTL-compatible enable input (pin 2) that places the regulator in ultra-low-power shutdown (50 µA IQ) when pulled low, making it suitable for dynamic power gating in multi-rail automotive ECUs. The device maintains ±2% output accuracy over temperature and load, validated under AEC-Q100 stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% at 25 °C; maintains regulation across -40 to 125 °C ambient |
| Dropout Voltage | 0.4 V typical at 500 mA load; enables operation with minimal headroom (e.g., 2.9 V input) |
| Quiescent Current | 50 µA in OFF mode; 0.5–2 mA in ON mode - critical for always-on vehicle modules |
| PSRR | 82 dB at 120 Hz; suppresses ripple from noisy 12 V battery supply in automotive environments |
| Stability Capacitance | Only 2.2 µF ceramic output capacitor required - reduces BOM cost and PCB area vs. legacy LDOs |
| Operating Range | -40 to 125 °C junction temperature; qualified to AEC-Q100 Grade 1 for under-hood applications |
| Enable Logic | TTL-compatible EN pin (pin 2); active-high, 2 V min VIH, 0.8 V max VIL - interfaces directly with MCU GPIO |
Pinout & Package
LF25CDT-TRY is housed in a thermally enhanced PPAK-5 (Power Package) with exposed thermal pad electrically connected to GND. The package supports high-power dissipation (RthJA = 100 °C/W) and surface-mount reflow assembly.
| 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 |
| 2 – EN | Enable control input | TTL-compatible logic input; high = ON, low = shutdown (50 µA IQ) |
| 3 – GND | Ground reference | Common return for input, output, and enable; tied to exposed thermal pad |
| 4 – OUT | Regulated output | Delivers stable 2.5 V ±2% up to 500 mA; requires 2.2 µF ceramic capacitor |
| 5 – TAB | Thermal pad / GND | Electrically connected to GND; must be soldered to large copper pour for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified (-40 to 125 °C), with PAT/SYL/SBL statistical testing |
| Ultra-low shutdown current | 50 µA max OFF-mode IQ - extends battery life in always-on ECU sleep states |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - suitable for analog sensor rails and ADC references |
| Internal protection | Integrated current limit and thermal shutdown - eliminates need for external fault management |
| Minimal external components | Stable with only 2.2 µF CO (ESR 0.1–10 Ω); no compensation network required |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powers microcontroller core voltage and CAN transceiver bias in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Local 2.5 V LDO supplying safety-critical MCU I/O banks and sensor interface circuits. Use Value: AEC-Q100 qualification and 125 °C operation ensure reliability in high-temperature under-hood environments. |
Use Scenario: Supplies image signal processor (ISP) reference voltage and radar SoC auxiliary rail in front-camera modules. IC Role / Device Role / Timing Role: Low-noise, enable-controlled 2.5 V regulator for analog front-end and timing-sensitive digital blocks. Use Value: 50 µV noise and 82 dB PSRR prevent corruption of high-resolution image data and time-of-flight measurements. |
| Body Control Module (BCM) | Infotainment Power Management |
|
Use Scenario: Provides regulated 2.5 V for LIN transceivers and door module microcontrollers in distributed body electronics. IC Role / Device Role / Timing Role: Shutdown-capable LDO enabling selective power-down of non-critical subfunctions during vehicle sleep. Use Value: 50 µA OFF-mode current minimizes parasitic drain on 12 V battery during extended parking periods. |
Use Scenario: Generates clean 2.5 V supply for audio codec and display timing controller in head-unit designs. IC Role / Device Role / Timing Role: Secondary LDO delivering low-noise bias for precision analog circuitry adjacent to switching power stages. Use Value: 2.2 µF stability requirement simplifies layout and avoids large tantalum capacitors near sensitive audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73325PDBVR | 2.5 V, ±1%, 300 mA, SOT-23-5; 25 µA IQ in shutdown; 0.25 V dropout at 300 mA | Lower current rating and smaller package - suited for space-constrained non-automotive designs | Select if board space is critical and AEC-Q100 is not required; verify thermal derating at 125 °C |
| NCP1117DT25RKG | 2.5 V, ±2%, 1 A, SOT-223; no enable pin; 1.2 V dropout at 800 mA; 6 mA quiescent current | Lacks logic control and automotive qualification; higher dropout and IQ limit its use in battery-sensitive systems | Consider only for cost-driven industrial applications where enable function and ultra-low IQ are unnecessary |
Compared with TLV73325PDBVR and NCP1117DT25RKG, LF25CDT-TRY uniquely combines AEC-Q100 qualification, 500 mA output, TTL-enable, and 50 µA shutdown current - making it the only option for automotive LDO applications demanding both functional safety readiness and dynamic power control.
Availability
LF25CDT-TRY is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, and infotainment systems requiring stable component supply across automotive production lifecycles.
Supply support for LF25CDT-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, power, microcontroller, and automotive ICs.
LF25CDT-TRY belongs to the LFXX family of automotive-grade LDO regulators engineered specifically for under-hood and safety-critical power management in AEC-Q100-compliant vehicle systems.
FAQ
What is the minimum input voltage required for regulation at full 500 mA load?
The LF25CDT-TRY requires a minimum input voltage of 2.9 V to maintain 2.5 V output at 500 mA, based on its 0.4 V typical dropout voltage. At higher temperatures or worst-case process corners, the dropout may reach 1.3 V, so 3.8 V input is recommended for guaranteed regulation across the full -40 to 125 °C range.
Can the EN pin be left floating, or does it require a pull-up/down resistor?
The EN pin must not be left floating. It has no internal pull-up or pull-down; an external 10–100 kΩ pull-up to IN is required for default ON operation. For controlled shutdown, drive it actively low via MCU GPIO or open-drain logic. Floating EN may cause erratic startup or unintended shutdown due to noise coupling.
Is the thermal pad (pin 5) electrically isolated or connected internally?
The thermal pad (pin 5) is electrically connected to GND internally and must be soldered to a PCB GND plane. This connection provides both thermal conduction and electrical grounding. Failure to connect it results in excessive junction temperature rise and potential thermal shutdown during sustained 500 mA operation.
Does LF25CDT-TRY support reverse polarity or reverse current protection?
No. LF25CDT-TRY lacks integrated reverse-polarity or reverse-current protection. External protection - such as a series Schottky diode on the input or a back-to-back MOSFET arrangement - is required if the system risks battery reversal or output voltage exceeding input (e.g., during hot-swap or load-dump events).
LF25CDT-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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 65dB (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
LF25CDT-TRY FAQ
1.How can I place an order for LF25CDT-TRY through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25CDT-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 LF25CDT-TRY reliable?
The price and inventory of LF25CDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25CDT-TRY is usually 5 days.
3.What payment methods are accepted for LF25CDT-TRY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25CDT-TRY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25CDT-TRY?
LF25CDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25CDT-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 LF25CDT-TRY?
For technical support, including LF25CDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25CDT-TRY requirements.
6.How does Aetrix verify that LF25CDT-TRY is sourced from the original manufacturer or authorized distributors?
All LF25CDT-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 LF25CDT-TRY meets industry standards.
7.What is the process for return or replacement of LF25CDT-TRY?
All LF25CDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF25CDT-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 LF25CDT-TRY part is unused and in its original packaging.
Return procedure for LF25CDT-TRY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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