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STMicroelectronics LF25CDT-TR
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- Part No.:
- LF25CDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF25CDT-TR.pdf
- Description:
- IC REG LINEAR 2.5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
LF25CDT-TR from STMicroelectronics is a 2.5 V, ±2% tolerance automotive-grade low-dropout linear regulator in DPAK package, delivering up to 500 mA output current with 0.4 V dropout at 500 mA, 50 µA quiescent current in OFF mode, and AEC-Q100 qualification for use in engine control units requiring stable 2.5 V bias for microcontroller I/O or sensor signal conditioning.
For engineers reviewing the LF25CDT-TR datasheet, LF25CDT-TR pinout, LF25CDT-TR application, or LF25CDT-TR equivalent, this page provides verified electrical specs, thermal performance data, shutdown logic interface behavior, and automotive-grade reliability context - all confirmed from ST's official DocID2574 Rev 31 production datasheet.
Technical Context
The LF25CDT-TR implements a PNP-based LDO architecture with internal current and thermal limiting, enabling safe operation under overload or high ambient temperature. Its TTL-compatible inhibit input (pin 2) allows precise system-level power sequencing in multi-rail automotive modules.
Stable with only 2.2 µF ceramic output capacitance (ESR 0.1–10 Ω), it achieves 82 dB supply voltage rejection at 120 Hz and maintains ±2% output accuracy over -40 °C to 125 °C junction temperature - meeting AEC-Q100 Grade 1 requirements for under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% at 25 °C; maintains regulation across -40 °C to 125 °C for automotive ECU sensor interfaces |
| Dropout Voltage | 0.4 V max at 500 mA load; enables operation from 2.9 V input in start-stop battery conditions |
| Quiescent Current | 50 µA typ. in OFF mode; reduces standby power in always-on vehicle networks |
| Output Current | 500 mA continuous; supports multiple downstream logic rails or analog circuitry |
| Supply Rejection | 82 dB at 120 Hz; suppresses alternator ripple and switching noise in 12 V systems |
| Thermal Resistance | RthJA = 100 °C/W (DPAK); requires minimal copper area for 125 °C operation at full load |
| Shutdown Logic | TTL-compatible inhibit input (VIL ≤ 0.8 V, VIH ≥ 2 V); enables microcontroller-controlled power gating |
Pinout & Package
LF25CDT-TR is housed in a surface-mount DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND. The package supports high-power dissipation in compact automotive PCB layouts and is compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 2.9–16 V DC; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 2 – INH | Inhibit control input | Active-low TTL-compatible enable; pulls device into <50 µA shutdown when ≤0.8 V |
| 3 – GND | Ground reference and thermal pad connection | Must be soldered to large PCB copper pour for thermal management and noise immunity |
| 4 – OUT | Regulated 2.5 V output | Stable with 2.2 µF ceramic capacitor (ESR 0.1–10 Ω); supplies MCU core or ADC reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (-40 °C to +125 °C) with PAT/SYL/SBL statistical testing for automotive deployment |
| Ultra-low shutdown current | 50 µA typical OFF-mode draw enables >10-year battery life in always-on telematics modules |
| Minimal external components | Only 2.2 µF CO required; eliminates bulk electrolytic capacitors and saves board space |
| Robust protection | Internal current limit and thermal shutdown prevent damage during load faults or overheating |
| High PSRR at low frequency | 82 dB at 120 Hz rejects alternator ripple without additional LC filtering |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powering 2.5 V analog front-end of knock sensor interface in gasoline direct injection engines. IC Role / Device Role / Timing Role: Local LDO providing clean, regulated bias for precision op-amps and ADC drivers. Use Value: 0.4 V dropout ensures operation down to 2.9 V battery during cranking; ±2% tolerance meets ASIL-B sensor accuracy requirements. |
Use Scenario: Supplying image signal processor (ISP) I/O banks in surround-view camera modules. IC Role / Device Role / Timing Role: Dedicated low-noise 2.5 V rail for high-speed digital I/O with tight voltage margin. Use Value: 50 µA shutdown current enables camera sleep mode without compromising wake latency; AEC-Q100 qualification ensures field reliability. |
| Body Control Module (BCM) | Infotainment Head Unit |
|
Use Scenario: Regulating power to LIN transceiver and CAN physical layer buffers in door module ECUs. IC Role / Device Role / Timing Role: System-level power gate controlled via microcontroller GPIO to reduce parasitic drain. Use Value: TTL-compatible inhibit pin allows direct MCU control without level-shifting; 100 °C/W RthJA permits compact layout in sealed enclosures. |
Use Scenario: Biasing audio codec and touch controller in automotive infotainment displays. IC Role / Device Role / Timing Role: Low-noise local regulator isolating sensitive analog circuitry from noisy digital domains. Use Value: 50 µV RMS output noise prevents audible artifacts; 82 dB PSRR suppresses switching noise from DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD29300PT25R | 2.5 V, ±2%, 3 A output, higher quiescent current (120 µA OFF), TO-220 package | Higher current capability but larger footprint and no AEC-Q100 grade | Choose for non-automotive industrial applications needing >500 mA |
| TLV73325PDBVR | 2.5 V, ±1%, 300 mA, 45 µA OFF, SOT-23-5, no AEC-Q100 | Smaller package and tighter tolerance, but lower current and unqualified for automotive | Choose for space-constrained consumer or industrial designs where AEC-Q100 is not required |
Compared with LD29300PT25R and TLV73325PDBVR, the LF25CDT-TR uniquely combines AEC-Q100 Grade 1 qualification, 500 mA output, ultra-low shutdown current, and DPAK thermal performance - making it the only drop-in solution for production automotive modules requiring validated reliability and compact thermal design.
Availability
LF25CDT-TR is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, and infotainment head units requiring stable component supply under AEC-Q100-compliant manufacturing and traceability.
Supply support for LF25CDT-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 power management applications.
The LFXX series is ST's automotive-qualified LDO family targeting under-hood and cabin electronics, engineered specifically for robustness in harsh environments and compliance with AEC-Q100 stress testing protocols.
FAQ
What is the maximum input voltage for LF25CDT-TR?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown above 18 V. For normal regulation, the recommended operating input range is 2.9 V to 16 V - sufficient to cover automotive battery transients including cold-crank (6.5 V) and load-dump (up to 40 V, handled by upstream protection).
Does LF25CDT-TR require an input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor is required between IN and GND, placed as close as possible to the device. This stabilizes the input impedance and prevents oscillation during fast load transients, especially critical in automotive environments with long harness traces.
How is thermal performance affected by PCB layout?
Thermal resistance (RthJA = 100 °C/W) assumes a 100 mm² 2-oz copper pad connected to the exposed thermal tab. Reducing pad area or omitting thermal vias increases junction temperature by up to 30 °C at full 500 mA load - potentially triggering thermal shutdown in enclosed housings.
Can LF25CDT-TR be used without the inhibit function?
Yes - tying INH to IN (or 3.3 V/5 V logic HIGH) forces permanent ON operation. However, doing so forfeits the 50 µA shutdown benefit. For always-on applications like ECU main power, this configuration is valid and commonly implemented with a pull-up resistor.
LF25CDT-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:
- 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:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF25CDT-TR FAQ
1.How can I place an order for LF25CDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25CDT-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 LF25CDT-TR reliable?
The price and inventory of LF25CDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25CDT-TR is usually 5 days.
3.What payment methods are accepted for LF25CDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25CDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25CDT-TR?
LF25CDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25CDT-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 LF25CDT-TR?
For technical support, including LF25CDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25CDT-TR requirements.
6.How does Aetrix verify that LF25CDT-TR is sourced from the original manufacturer or authorized distributors?
All LF25CDT-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 LF25CDT-TR meets industry standards.
7.What is the process for return or replacement of LF25CDT-TR?
All LF25CDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF25CDT-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 LF25CDT-TR part is unused and in its original packaging.
Return procedure for LF25CDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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