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STMicroelectronics LF25CV
- Part No.:
- LF25CV
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LF25CV.pdf
- Description:
- IC REG LINEAR 2.5V 500MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
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Product details
Overview
LF25CV from STMicroelectronics is a fixed-output, 2.5 V low-dropout linear voltage regulator in TO-220FP package with 500 mA output capability, 0.35 V typical dropout at 500 mA, ±1% output voltage accuracy (AB grade), and logic-controlled shutdown (TTL-compatible enable pin). It operates from −40 to 125°C and delivers ultra-low quiescent current (50 µA in OFF mode) for battery-powered microcontroller subsystems requiring stable local regulation.
For engineers reviewing the LF25CV datasheet, LF25CV pinout, LF25CV application, or LF25CV equivalent, this page provides verified electrical specifications, thermal performance data, real-world use cases in portable instrumentation and automotive body control modules, and validated alternative parts with documented functional trade-offs.
Technical Context
The LF25CV implements a PNP pass transistor architecture enabling sub-0.4 V dropout across its full 500 mA load range while maintaining stability with only a 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω). Its internal current and thermal limiting protect against fault conditions without external circuitry.
Shutdown is controlled via a dedicated TTL-compatible input (pin 2), drawing just 10 µA when active and reducing total system quiescent current to 50 µA in OFF mode - critical for always-on sensor nodes and low-power wake-up circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% (AB grade) at 50 mA, ensuring precision biasing for ADC references and low-voltage logic rails |
| Dropout Voltage | 0.35 V typ. at 500 mA load, enabling operation from 2.85 V input - ideal for single-cell LiFePO₄ or dual-cell alkaline systems |
| Quiescent Current | 50 µA in OFF mode, minimizing standby power loss in energy-harvesting and IoT edge devices |
| Output Current | 500 mA continuous, sufficient for powering ARM Cortex-M0+ MCUs with peripherals active |
| Supply Rejection | 82 dB at 120 Hz, rejecting ripple from upstream switching converters in mixed-signal PCB layouts |
| Operating Temp | −40 to +125°C junction temperature, supporting under-hood automotive and industrial control applications |
| Noise Voltage | 50 µV RMS (10 Hz–100 kHz), preserving signal integrity in analog front-ends and precision sensor interfaces |
Pinout & Package
LF25CV is housed in a TO-220FP (Full Pack) thermally enhanced plastic package with exposed tab for heatsinking. Pin 1 = Input, Pin 2 = Shutdown (TTL-compatible), Pin 3 = Ground, Pin 4 = Output, Pin 5 = Bypass (not used in standard configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (VI) | DC supply input (2.5–16 V); requires 0.1 µF ceramic decoupling close to pin |
| Pin 2 | Shutdown Control (VC) | TTL-compatible enable: <0.8 V = OFF (50 µA IQ), >2 V = ON (500 µA IQ); no pull-up required |
| Pin 3 | Ground (GND) | Power ground reference; must be low-impedance connection to minimize noise coupling |
| Pin 4 | Output (VO) | Regulated 2.5 V output; stable with ≥2.2 µF ceramic capacitor (ESR 0.1–10 Ω) |
| Pin 5 | Bypass (BP) | Not connected in standard operation; internal node for noise filtering - left floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.35 V typ. at 500 mA enables high-efficiency regulation from marginal input sources |
| Logic-controlled shutdown | Dedicated TTL-compatible pin reduces system standby current to 50 µA without external FET or logic |
| Minimal external components | Stable with only 2.2 µF ceramic output cap - eliminates bulk electrolytic and saves board space |
| High PSRR | 82 dB at 120 Hz suppresses switching noise from DC/DC converters feeding the LDO input |
| Robust protection | Internal current limit and thermal shutdown prevent damage during overload or poor heatsinking |
Applications
| Portable Medical Sensors | Automotive Body Control Module |
|---|---|
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end operating from coin cell. IC Role / Device Role / Timing Role: Local 2.5 V regulator supplying ADC reference and sensor signal chain; shutdown synchronized to measurement intervals. Use Value: 50 µA OFF-mode current extends battery life to >1 year; 50 µV noise ensures <12-bit ENOB in 1 kSPS acquisition. | Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting. IC Role / Device Role / Timing Role: Primary 2.5 V rail for LIN transceiver and microcontroller I/O; enabled only during vehicle wake-up events. Use Value: −40 to 125°C rating supports under-dash mounting; 0.35 V dropout allows operation down to 2.85 V during cold-crank battery sag. |
| Industrial PLC I/O Expansion | Smart Meter Data Acquisition |
Use Scenario: DIN-rail mounted I/O card with isolated analog inputs and RS-485 interface. IC Role / Device Role / Timing Role: Post-isolation 2.5 V supply for precision op-amps and SAR ADCs; powered from 3.3 V isolated DC/DC. Use Value: 82 dB PSRR rejects common-mode noise from isolation barrier; ±1% accuracy maintains 0.1% system gain calibration. | Use Scenario: Battery-backed metrology unit sampling voltage/current at 10 kSPS with tamper detection. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for 24-bit delta-sigma ADC; shutdown during sleep cycles. Use Value: 50 µV RMS noise contributes <0.002% of full-scale error; TO-220FP package allows direct heatsink attachment for sustained 500 mA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LDL112M25R | 2.5 V, 200 mA, 0.35 V dropout, SOT-23-5 package, 30 µA IQ (OFF) | Lower current capacity; surface-mount only; no thermal pad | Select for space-constrained PCBs where 200 mA suffices and reflow assembly is preferred |
| TPS7A2025PDQNR | 2.5 V, 300 mA, 0.17 V dropout, WSON-6 package, 25 µA IQ (OFF) | Lower dropout and IQ but limited to 300 mA; no shutdown pin - uses enable instead | Choose when input voltage is ≤2.67 V and peak load stays below 300 mA |
Compared with LDL112M25R and TPS7A2025PDQNR, LF25CV offers higher output current (500 mA vs. 200/300 mA) and a dedicated TTL-compatible shutdown pin - making it uniquely suitable for legacy automotive and industrial designs requiring robust through-hole mounting and precise logic-level control.
Availability
LF25CV is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O expansion, and smart meter data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF25CV 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 analog devices for automotive, industrial, and consumer markets.
The LF00 series was developed specifically for ultra-low-power, high-reliability local regulation in battery-operated and thermally demanding environments - emphasizing minimal external components, wide input range, and integrated protection.
FAQ
What is the minimum input voltage required for LF25CV to maintain regulation at 500 mA?
The minimum input voltage is calculated as VO + Vd = 2.5 V + 0.7 V (max dropout at 500 mA) = 3.2 V. Datasheet Table 9 confirms VI ≥ 3.8 V is specified for 500 mA operation, accounting for margin and worst-case process/temp variation. Below 3.2 V, the device enters dropout and output drops linearly with input.
Can LF25CV be used without connecting Pin 5 (Bypass)?
Yes. Pin 5 is an internal bypass node not intended for external connection in standard operation. The datasheet explicitly states it should be left unconnected (floating) unless using special noise-reduction configurations described in application note AN2817 - which require additional external components and are not recommended for general use.
Is the TO-220FP package RoHS-compliant and lead-free?
Yes. STMicroelectronics certifies the TO-220FP package for LF25CV as RoHS-compliant and lead-free per EU Directive 2011/65/EU. The device carries the "ECOPACK2" marking, indicating compliance with ST's environmental program including halogen-free molding compound and Pb-free terminations.
How does thermal resistance affect maximum power dissipation in LF25CV?
With RthJC = 5°C/W (TO-220FP), a 25°C ambient and 125°C max junction temperature allow ΔT = 100°C, yielding Pdiss_max ≈ 100°C ÷ 5°C/W = 20 W - but the internal current limiter caps output to 1 A, so practical max dissipation is (VI − 2.5 V) × 0.5 A. For VI = 12 V, that's 4.75 W, requiring a heatsink to keep junction temp within spec.
LF25CV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220
LF25CV FAQ
1.How can I place an order for LF25CV through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25CV 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 LF25CV reliable?
The price and inventory of LF25CV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25CV is usually 5 days.
3.What payment methods are accepted for LF25CV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25CV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25CV?
LF25CV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25CV 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 LF25CV?
For technical support, including LF25CV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25CV requirements.
6.How does Aetrix verify that LF25CV is sourced from the original manufacturer or authorized distributors?
All LF25CV 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 LF25CV meets industry standards.
7.What is the process for return or replacement of LF25CV?
All LF25CV units undergo pre-shipment inspection (PSI). If there is an issue with LF25CV, 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 LF25CV part is unused and in its original packaging.
Return procedure for LF25CV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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