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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LK112M17TR

Name: LK112M17TR
Brand: STMicroelectronics
SKU: LK112M17TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LK112M17TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-74A, SOT-753

Datasheet:: LK112M17TR.pdf

Description:: IC REG LINEAR 1.7V 150MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:1,833

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Product details

Overview

LK112M17TR from STMicroelectronics is a low-noise, low-dropout linear voltage regulator with integrated shutdown control and internal PNP pass transistor. It delivers up to 150 mA output current with 350 mV dropout at full load, 30 µVrms output noise (10 Hz–80 kHz), and 0.1 µA quiescent current in OFF mode. It operates from input voltages as low as V_OUT + 0.5 V (for V_OUT > 2 V) and supports 1.7 V fixed output - ideal for powering precision analog sensors and ultra-low-power microcontrollers in battery-operated IoT nodes.

For engineers reviewing the LK112M17TR datasheet, LK112M17TR pinout, LK112M17TR application, or LK112M17TR equivalent, key selection criteria include its 1.7 V fixed output, SOT23-5L package thermal performance (R_thJA = 255 °C/W), shutdown logic compatibility with TTL/CMOS, and bypass-capacitor-enabled noise reduction capability.

Technical Context

The LK112M17TR uses an internal PNP pass transistor architecture to achieve low dropout and high PSRR (55 dB at 400 Hz). Its shutdown function accepts logic-level inputs (ON ≥ 1.8 V, OFF ≤ 0.6 V), enabling precise system-level power sequencing.

Thermal protection activates below 150 °C junction temperature, and current limiting responds to short-circuit or overcurrent conditions. Output stability is ensured with standard 2.2 µF ceramic output capacitance and optional 0.1 µF bypass capacitor on the dedicated Bypass pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 1.7 V ±2% - ensures stable bias for low-voltage ADC references and RF front-end LDO stages.
Max output current	150 mA - sufficient for powering Cortex-M0+ MCUs with peripherals active in sleep-wake cycles.
Dropout voltage	0.35 V max at 150 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) sources.
Quiescent current	250 µA max in ON mode, 0.1 µA in OFF mode - critical for multi-year battery life in wireless sensor transmitters.
Output noise	30 µV_rms (10 Hz–80 kHz) with 0.1 µF bypass cap - meets noise floor requirements of 16-bit SAR ADCs and op-amp signal chains.
PSRR	55 dB at 400 Hz - suppresses ripple from switching DC-DC converters upstream in hybrid power architectures.
Input voltage range	2.5 V to 14 V (for V_OUT < 2 V); V_OUT + 0.5 V to 14 V (for V_OUT > 2 V) - supports wide-input industrial supply rails.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, thermally enhanced with die attach flag connected to GND pin (Pin 2) to reduce R_thJA.

Pin/Terminal	Circuit Role	Design Meaning
1 (SHDN)	Shutdown control input	Active-high TTL/CMOS-compatible enable; pulls regulator into sub-100 nA shutdown state when ≤0.6 V.
2 (GND)	Ground reference & thermal path	Internally bonded to die attach flag - primary thermal conduction path to PCB copper pour.
3 (BYPASS)	Noise reduction node	Accepts 0.1 µF capacitor to shunt high-frequency noise and reduce output RMS noise to 30 µV.
4 (OUT)	Regulated output	Delivers stable 1.7 V to load; requires ≥2.2 µF ceramic output capacitor for stability.
5 (IN)	Unregulated input	Accepts input from DC-DC converter or battery; must exceed V_OUT + 0.5 V for regulation.

Key Features

Feature	Design Value
Low-noise regulation	30 µV_rms output noise with external 0.1 µF bypass cap - eliminates need for secondary filtering in precision analog stages.
Ultra-low shutdown IQ	≤0.1 µA shutdown current - extends shelf life and standby time in energy-harvesting systems.
Integrated protection	Thermal shutdown (T_J < 150 °C) and current limiting (150 mA) - prevents damage during fault conditions without external circuitry.
Wide input compatibility	Operates down to V_OUT + 0.5 V (for V_OUT > 2 V) or 2.5 V absolute min (for V_OUT = 1.7 V) - supports direct connection to buck converter outputs or aging batteries.

Applications

Wearable Health Monitor

Industrial Sensor Node

Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery.

IC Role / Device Role / Timing Role: Primary 1.7 V LDO supplying analog front-end and ultra-low-power MCU.

Use Value: 30 µV_rms noise ensures <1 LSB error in 16-bit ADC conversion; 0.1 µA shutdown extends battery life beyond 3 years.

Use Scenario: Wireless vibration sensor mounted on rotating machinery with 10-year deployment target.

IC Role / Device Role / Timing Role: Regulator for MEMS accelerometer and sub-GHz RF transceiver.

Use Value: 150 mA capability supports burst transmission; low dropout allows operation until battery reaches 2.2 V.

Smart Meter Auxiliary Rail

Portable Diagnostic Instrument

Use Scenario: Secondary 1.7 V rail for metrology ADC and real-time clock in polyphase electricity meter.

IC Role / Device Role / Timing Role: Low-noise analog supply isolated from noisy digital domain.

Use Value: 55 dB PSRR rejects switching noise from main 3.3 V DC-DC; SOT23-5L footprint minimizes board area.

Use Scenario: Handheld ultrasound probe requiring silent power for analog beamforming ICs.

IC Role / Device Role / Timing Role: Clean 1.7 V source for high-gain, low-offset op-amps and DACs.

Use Value: Bypass pin enables <30 µV_rms noise floor - avoids signal corruption in MHz-range echo processing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6217D172MR-G	1.7 V fixed output, 150 mA, 250 mV dropout, 40 µV_rms noise, SOT23-5	Higher noise (40 vs. 30 µV_rms) and no dedicated bypass pin - less suitable for sub-LSB analog accuracy.	Select when cost sensitivity outweighs 10 µV noise margin and thermal performance is secondary.
Richtek RT9013-17GB	1.7 V fixed output, 300 mA, 300 mV dropout, 45 µV_rms noise, SOT23-5	Higher output current but higher noise and no thermal shutdown - requires external fault management.	Choose only if >150 mA load headroom is mandatory and system-level thermal monitoring exists.

Compared with XC6217D172MR-G and RT9013-17GB, the LK112M17TR provides the lowest noise floor and integrated thermal/current protection in a thermally optimized SOT23-5L package - making it optimal for space-constrained, battery-powered precision analog systems where reliability and signal integrity are non-negotiable.

Availability

LK112M17TR is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart meter auxiliary rails, and portable diagnostic instruments requiring stable component supply across multi-year production cycles.

Supply support for LK112M17TR 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 LK112 series belongs to ST's precision analog LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current regulation in battery-powered and signal-integrity-critical applications.

FAQ

What is the minimum input voltage required for regulation with LK112M17TR?

The LK112M17TR requires a minimum input voltage of 2.5 V due to its 1.7 V output being less than 2 V. This is specified in the datasheet's "Operative input voltage" section and verified across electrical characteristics tables for versions with V_OUT < 2 V.

Can the Bypass pin be left unconnected?

Yes, the Bypass pin may be left floating, but doing so results in higher output noise (typ. 50–60 µV_rms). To achieve the rated 30 µV_rms, a 0.1 µF ceramic capacitor must be placed between Bypass and GND - confirmed in the "Description" and "Electrical Characteristics" sections of the datasheet.

Does LK112M17TR support reverse polarity protection?

No, the LK112M17TR does not integrate reverse polarity protection. The absolute maximum rating for reverse input voltage is 0 V, and the device can be damaged if IN is driven negative relative to GND. External diode protection is required in systems with potential reverse-battery or hot-swap conditions.

Is the shutdown function compatible with 1.8 V GPIOs from modern microcontrollers?

Yes - the SHDN pin is TTL/CMOS compatible with a guaranteed ON threshold of ≥1.8 V and OFF threshold of ≤0.6 V. This matches standard 1.8 V logic families, and the shutdown input current remains ≤35 µA at V_SHDN = 1.8 V, ensuring minimal loading on MCU GPIOs.

LK112M17TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 14V

Voltage - Output (Min/Fixed):: 1.7V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 150mA

Current - Quiescent (Iq):: 250 µA

Current - Supply (Max):: -

PSRR:: 55dB (400Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -30°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

LK112M17TR FAQ

1.How can I place an order for LK112M17TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LK112M17TR 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 LK112M17TR reliable?

The price and inventory of LK112M17TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LK112M17TR is usually 5 days.

3.What payment methods are accepted for LK112M17TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LK112M17TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LK112M17TR?

LK112M17TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LK112M17TR 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 LK112M17TR?

For technical support, including LK112M17TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LK112M17TR requirements.

6.How does Aetrix verify that LK112M17TR is sourced from the original manufacturer or authorized distributors?

All LK112M17TR 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 LK112M17TR meets industry standards.

7.What is the process for return or replacement of LK112M17TR?

All LK112M17TR units undergo pre-shipment inspection (PSI). If there is an issue with LK112M17TR, 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 LK112M17TR part is unused and in its original packaging.

Return procedure for LK112M17TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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