My Inquiry
My Account
STMicroelectronics LF27ABDT-TR
__2.jpg)
- Part No.:
- LF27ABDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF27ABDT-TR.pdf
- Description:
- IC REG LINEAR 2.7V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,136
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LF27ABDT-TR from STMicroelectronics is a 2.7 V fixed-output, very low dropout (LDO) linear voltage regulator in DPAK package with logic-controlled shutdown, delivering up to 500 mA output current, 0.2–0.35 V dropout at 200 mA, and ±1% output voltage accuracy at 25°C. It operates from 3.7 V to 16 V input, features 50 µA quiescent current in OFF mode, and targets battery-powered microcontroller subsystems requiring stable low-noise local regulation.
For engineers reviewing the LF27ABDT-TR datasheet, LF27ABDT-TR pinout, LF27ABDT-TR application, or LF27ABDT-TR equivalent, key selection criteria include its 2.7 V output tolerance, shutdown logic compatibility (TTL), thermal performance in DPAK (RthJA = 100 °C/W), and minimal 2.2 µF ceramic output capacitor requirement for stability.
Technical Context
The LF27ABDT-TR implements a PNP pass transistor architecture enabling ultra-low dropout voltage-0.2 V typical at 200 mA load-while maintaining high PSRR (82 dB at 120 Hz) and low output noise (50 µV RMS, 10 Hz–100 kHz). Its internal current and thermal limiting protect against fault conditions without external components.
Shutdown is controlled via a TTL-compatible enable input (Pin 2), drawing only 10 µA control current and reducing quiescent current to 50 µA in OFF mode. The device sustains full 500 mA output capability across –40 °C to +125 °C junction temperature range with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.7 V ±1% at 25°C; ensures precise rail generation for 2.7 V I/O or core logic without post-regulation trimming. |
| Dropout Voltage | 0.2–0.35 V at 200 mA; enables operation from single-cell Li-ion (3.0 V min) or 3.3 V bus with margin. |
| Max Output Current | 500 mA continuous; supports moderate-power MCU peripherals (ADC, UART, SPI flash) without derating at TJ ≤ 125°C. |
| Quiescent Current | 500 µA typical in ON mode, 50 µA in OFF mode; extends battery life in sleep-wake cycling applications. |
| PSRR | 82 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for tantalum or large electrolytics, reducing board area and cost. |
| Operating Temp | –40 °C to +125 °C junction; qualified for under-hood automotive, industrial PLC, and outdoor IoT node deployment. |
Pinout & Package
LF27ABDT-TR is housed in a surface-mount DPAK (TO-252) package with exposed thermal pad for enhanced heat dissipation. Pin 1 = Input (VI), Pin 2 = Shutdown (SHDN), Pin 3 = Ground (GND), Pin 4 = Output (VO).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VI) | Input supply connection | Accepts 3.7–16 V DC; must be decoupled with ≥0.1 µF ceramic close to pin for transient immunity. |
| Pin 2 (SHDN) | Active-high enable input | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2 V); pulls device into <50 µA standby when driven low. |
| Pin 3 (GND) | Power and control ground reference | Must be low-impedance; ties thermal pad electrically and thermally to PCB ground plane. |
| Pin 4 (VO) | Regulated output | Delivers 2.7 V ±1% to load; requires 2.2 µF ceramic capacitor (X5R/X7R) placed within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.2 V typ. at 200 mA enables use with tight input–output margins (e.g., 3.0 V → 2.7 V). |
| Logic-controlled shutdown | Pin 2 accepts standard TTL levels; reduces system idle power by >90% vs. always-on regulators. |
| High accuracy output | ±1% initial tolerance (AB grade) minimizes need for calibration in precision analog or ADC reference paths. |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) preserves signal integrity in sensor front-ends and audio codecs. |
| Robust protection | Internal current limit and thermal shutdown prevent damage during short-circuit or overload without external circuitry. |
Applications
| Portable Medical Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Wearable ECG patch with ultra-low-power MCU, analog front-end, and BLE radio operating from coin cell or rechargeable Li-ion. IC Role / Device Role / Timing Role: Local 2.7 V LDO supplying MCU I/O domain and precision ADC reference, enabled only during measurement bursts. Use Value: 50 µA OFF-mode current extends battery life to >1 year; 0.2 V dropout allows operation down to 2.9 V battery voltage. | Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting using 12 V vehicle battery. IC Role / Device Role / Timing Role: Secondary 2.7 V regulator powering CAN transceiver logic interface and microcontroller GPIO banks. Use Value: 125 °C junction rating ensures reliability in hot under-dash environments; 82 dB PSRR rejects alternator ripple. |
| Industrial PLC I/O Expansion Card | Smart Home Hub Power Management |
Use Scenario: DIN-rail mounted controller adding isolated digital inputs/outputs, powered from 24 V DC bus. IC Role / Device Role / Timing Role: Point-of-load regulator for FPGA configuration I/O bank and level-shifting buffers. Use Value: 2.2 µF ceramic stability simplifies layout on dense multi-layer PCB; ±1% accuracy ensures consistent logic thresholds. | Use Scenario: Wi-Fi/Zigbee hub with voice assistant SoC, memory, and multiple USB peripherals, powered from 5 V adapter. IC Role / Device Role / Timing Role: Standby rail generator for real-time clock, wake-on-LAN circuitry, and secure element. Use Value: TTL shutdown synchronizes with host SoC sleep states; 50 µA quiescent current meets Energy Star standby limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LDL1127PT50R | 2.7 V, 200 mA, 120 mV dropout, SOT-23-5 package | Lower current capacity; no thermal pad; limited to <200 mA loads | Select when board space is critical and load current ≤200 mA; not suitable for 500 mA peak demands. |
| NCP1117DT27T5G | 2.7 V, 800 mA, 1.2 V dropout, SOT-223 package | Higher dropout (1.2 V) requires ≥3.9 V input; larger RthJA (65 °C/W) | Choose if higher output current is needed and input voltage ≥4.0 V; avoid in battery systems with <3.5 V minimum. |
Compared with LDL1127PT50R and NCP1117DT27T5G, LF27ABDT-TR uniquely balances 500 mA capability, 0.2 V dropout, and DPAK thermal performance-making it optimal for space-constrained yet thermally demanding 2.7 V applications where input voltage headroom is minimal.
Availability
LF27ABDT-TR is available at Aetrix Electronics and suitable for portable medical devices, automotive body electronics, industrial PLC I/O modules, and smart home hubs requiring stable component supply with long-term manufacturability.
Supply support for LF27ABDT-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 microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The LF00 series was developed specifically for ultra-low-dropout, low-quiescent-current regulation in battery-powered and thermally constrained systems-emphasizing simplicity (no external compensation), robustness (integrated protection), and wide-input-voltage flexibility.
FAQ
What is the minimum input voltage required for stable 2.7 V output at 500 mA?
The LF27ABDT-TR requires a minimum input voltage of 3.1 V to maintain regulation at 500 mA load, based on its maximum dropout of 0.7 V (per Table 9, Vd = 0.4–0.7 V at 500 mA). At 200 mA, the typical dropout is 0.2 V, allowing stable operation from 2.9 V input.
Can the LF27ABDT-TR be used without an output capacitor?
No. A minimum 2.2 µF ceramic output capacitor (X5R/X7R, ESR 0.1–10 Ω) is mandatory for stability per the datasheet. Omitting it causes oscillation and potential damage. The capacitor must be placed within 5 mm of Pins 3 (GND) and 4 (VO) with low-inductance layout.
Is the shutdown pin active-high or active-low?
The shutdown pin (Pin 2) is active-high: the regulator operates normally when SHDN ≥ 2 V (TTL high), and enters ultra-low-power OFF mode when SHDN ≤ 0.8 V (TTL low). Pulling SHDN to GND disables the output; leaving it open is undefined and not recommended.
Does LF27ABDT-TR require a bypass capacitor on the input pin?
Yes. A 0.1 µF ceramic capacitor is specified in all electrical characteristic test conditions (Table 9) and must be placed as close as possible to Pin 1 (VI) and Pin 3 (GND) to suppress high-frequency noise and ensure transient response stability, especially when fed from a switching regulator.
LF27ABDT-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):
- 2.7V
- 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
LF27ABDT-TR FAQ
1.How can I place an order for LF27ABDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF27ABDT-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 LF27ABDT-TR reliable?
The price and inventory of LF27ABDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF27ABDT-TR is usually 5 days.
3.What payment methods are accepted for LF27ABDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF27ABDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF27ABDT-TR?
LF27ABDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF27ABDT-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 LF27ABDT-TR?
For technical support, including LF27ABDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF27ABDT-TR requirements.
6.How does Aetrix verify that LF27ABDT-TR is sourced from the original manufacturer or authorized distributors?
All LF27ABDT-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 LF27ABDT-TR meets industry standards.
7.What is the process for return or replacement of LF27ABDT-TR?
All LF27ABDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF27ABDT-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 LF27ABDT-TR part is unused and in its original packaging.
Return procedure for LF27ABDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF27ABDT-TR Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
