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

STMicroelectronics STLQ015M31R

Name: STLQ015M31R
Brand: STMicroelectronics
SKU: STLQ015M31R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STLQ015M31R

Manufacturer:: STMicroelectronics

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

Package:: SC-74A, SOT-753

Datasheet:: STLQ015M31R.pdf

Description:: IC REG LINEAR 3.1V 150MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:900

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Product details

Overview

STLQ015M31R from STMicroelectronics is a 3.1 V, 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, designed for battery-powered systems requiring extended standby life. It delivers ±2% output voltage accuracy at 25 °C, features 112 mV typical dropout at 150 mA, and supports ceramic output capacitors down to 1 µF. Its logic-controlled enable pin reduces shutdown current to 1 nA, making it ideal for always-on sensor and microcontroller power rails.

For engineers reviewing the STLQ015M31R datasheet, STLQ015M31R pinout, STLQ015M31R application, or STLQ015M31R equivalent, key selection criteria include quiescent current behavior across temperature and load, dropout performance at low input voltages (1.5 V min), thermal shutdown threshold (170 °C), and compatibility with 0.47–10 µF ceramic output capacitors with ESR between 0.056 Ω and 6 Ω.

Technical Context

The STLQ015M31R employs a P-channel MOSFET pass element enabling ultra-low IQ operation independent of load-1.0 µA typ. at no load and only 1.4 µA typ. at full 150 mA output. Its internal reference and error amplifier maintain tight regulation across -40 °C to 125 °C, with line regulation of ±0.01 %/V and load regulation of ±0.002 %/mA.

Enable control is TTL/CMOS-compatible: V_EN < 0.4 V disables the device (IOFF ≤ 200 nA at 125 °C), while V_EN > 0.7 V enables operation. Integrated protection includes constant-current short-circuit limiting (250–350 mA) and thermal shutdown with 15 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 3.1 V ±2% at 25 °C; ensures stable MCU core or sensor bias without external feedback.
Max output current	150 mA guaranteed; sufficient for low-power microcontrollers (e.g., STM32L0/L4), BLE SoCs, and analog sensors.
Quiescent current	1.4 µA typ. at 150 mA load; extends battery life in multi-year IoT endpoint deployments.
Dropout voltage	112 mV typ. at 150 mA; enables regulation from 3.21 V input-critical for single-cell Li-ion or LiFePO₄ systems.
Shutdown current	1 nA typ. at 25 °C; reduces system leakage to negligible levels during deep sleep modes.
Input voltage range	1.5 V to 5.5 V; supports coin cells (1.5 V), alkaline (up to 1.6 V × 3), and regulated 3.3/5 V rails.
Thermal shutdown	170 °C junction temperature with 15 °C hysteresis; prevents permanent damage under sustained overload or poor PCB thermal design.

Pinout & Package

SOT23-5L package: 2.95 mm × 1.60 mm × 1.45 mm body height, 0.95 mm pitch, lead-free and RoHS-compliant per ECOPACK® standards.

Pin/Terminal	Circuit Role	Design Meaning
3 (EN)	Enable input	Active-high logic control: tie to MCU GPIO or system PMIC rail; 1 nA leakage preserves battery during OFF state.
2 (GND)	Ground reference	Common return path for input, output, and internal circuitry; requires low-impedance PCB connection to minimize noise coupling.
1 (IN)	Input voltage supply	Accepts 1.5–5.5 V DC; must be decoupled with ≥1 µF ceramic capacitor close to pin 1 to suppress high-frequency ripple.
5 (OUT)	Regulated output	Delivers stable 3.1 V; compatible with 0.47–10 µF ceramic capacitors (ESR 0.056–6 Ω) for unconditional stability.
4 (NC)	No connect	Internally unconnected; must remain floating-no PCB trace or solder mask opening required.

Key Features

Feature	Design Value
Ultra-low quiescent current	1.4 µA at full 150 mA load enables >10-year battery life in 20 µA average-current IoT nodes.
Ceramic capacitor compatibility	Stable with 1 µF X5R/X7R output cap-eliminates costly tantalum or electrolytic alternatives and saves board space.
Logic-controlled shutdown	EN pin reduces total system current to 1 nA, enabling true zero-power sleep states in portable medical and wearables.
Integrated protection	Current-limiting and thermal shutdown prevent field failures in unattended edge devices operating in variable ambient conditions.
Wide temperature range	-40 °C to +125 °C operation supports automotive cabin modules, industrial sensors, and outdoor metering applications.

Applications

Wearable Health Monitor

Smart Meter Sensor Node

Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell with 10-year target lifetime.

IC Role / Device Role / Timing Role: Primary LDO supplying 3.1 V to ultra-low-power ADC and BLE transceiver during active sensing bursts and deep-sleep intervals.

Use Value: 1.4 µA quiescent current at load and 1 nA shutdown current directly extend battery life beyond 10 years under ISO 14155 duty cycle assumptions.

Use Scenario: Battery-backed gas meter with optical encoder and LoRaWAN radio operating in -25 °C to 70 °C outdoor enclosures.

IC Role / Device Role / Timing Role: Regulator for MEMS pressure sensor and microcontroller, activated only during hourly measurement cycles.

Use Value: 112 mV dropout allows reliable 3.1 V output from partially discharged 3.6 V LiSOCl₂ primary cell, maintaining accuracy across full battery discharge curve.

Industrial Wireless Sensor

Portable Diagnostic Device

Use Scenario: Vibration-monitoring node on rotating machinery using piezoelectric sensor and ARM Cortex-M0+ MCU.

IC Role / Device Role / Timing Role: Power source for analog front-end and MCU during triggered 5-second acquisition windows every 15 minutes.

Use Value: Thermal shutdown at 170 °C protects against overheating in sealed metal housings exposed to direct sunlight or motor heat radiation.

Use Scenario: Handheld blood glucose meter with LCD display and electrochemical test strip interface.

IC Role / Device Role / Timing Role: Stable 3.1 V rail for precision analog front-end and touch controller during 30-second test sequence.

Use Value: ±2% output tolerance ensures consistent ADC reference accuracy across temperature, critical for sub-5% clinical measurement repeatability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-I_Q LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P312MR	3.1 V fixed, 150 mA, 1.0 µA I_Q (no load), but only 1.8 µA at 150 mA; no thermal shutdown; SOT23-5 pinout identical.	Lacks overtemperature protection-requires external thermal monitoring in enclosed designs.	Select when lowest possible no-load IQ is prioritized and thermal risk is mitigated by system-level controls.
Richtek RT9013-31	3.1 V fixed, 300 mA, 2.5 µA I_Q at full load; includes thermal shutdown but higher dropout (200 mV @ 150 mA); SOT23-5 pinout differs (EN on pin 2).	Higher current capability suits future-proofing, but 200 mV dropout limits use with sub-3.3 V inputs.	Select when headroom exists above 3.3 V input and higher output current margin is needed for peripheral expansion.

Compared with XC6206P312MR, STLQ015M31R adds thermal protection and maintains lower loaded IQ; versus RT9013-31, it achieves significantly lower dropout and tighter output tolerance-making it optimal for space-constrained, thermally aggressive, single-cell battery systems where regulation margin and reliability are non-negotiable.

Availability

STLQ015M31R is available at Aetrix Electronics and suitable for wearable health monitors, smart meter sensor nodes, industrial wireless sensors, and portable diagnostic devices requiring stable component supply with long-term lifecycle assurance.

Supply support for STLQ015M31R 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 STLQ015 series belongs to ST's ultra-low-power LDO portfolio, engineered specifically for energy-harvesting and battery-operated edge devices demanding nanowatt-level shutdown and microampere-loaded quiescent operation.

FAQ

What is the minimum input voltage required for regulation at 3.1 V output?

The STLQ015M31R maintains regulation down to 1.5 V input, but usable headroom begins at VIN = VOUT + VDROP. With 112 mV typical dropout at 150 mA, the practical minimum is 3.212 V. At light loads (<1 mA), dropout drops further-enabling operation from 3.15 V sources while retaining ±2% accuracy.

Can the STLQ015M31R be used with a 0.47 µF ceramic output capacitor?

Yes-the datasheet specifies stable operation with COUT as low as 0.47 µF (X5R/X7R), provided ESR remains between 0.056 Ω and 6 Ω. This enables compact layouts in space-constrained wearables, though 1 µF is recommended for optimal transient response and PSRR across frequency.

Does the NC pin (pin 4) require any PCB layout consideration?

No-pin 4 is internally unconnected and must remain floating. Do not route traces, apply solder mask openings, or place vias near this pad. ST's SOT23-5L footprint drawing explicitly excludes pin 4 from thermal or electrical connectivity requirements.

How does the enable pin behave under fast GPIO toggling?

The EN pin has 160 µs typical turn-on time (to 95% VOUT) and no specified turn-off delay. Fast toggling (>10 kHz) is not recommended: internal logic lacks hysteresis, and repeated transitions may induce output instability or increased switching current. Use debounced signals or RC filtering for reliable enable control.

STLQ015M31R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.1V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 1.7 µA

Current - Supply (Max):: 2.4 µA

PSRR:: 40dB ~ 15dB (1kHz ~ 100kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

STLQ015M31R FAQ

1.How can I place an order for STLQ015M31R through Aetrix?

Please submit a Request for Quotation (RFQ) for STLQ015M31R 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 STLQ015M31R reliable?

The price and inventory of STLQ015M31R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLQ015M31R is usually 5 days.

3.What payment methods are accepted for STLQ015M31R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLQ015M31R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLQ015M31R?

STLQ015M31R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLQ015M31R 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 STLQ015M31R?

For technical support, including STLQ015M31R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLQ015M31R requirements.

6.How does Aetrix verify that STLQ015M31R is sourced from the original manufacturer or authorized distributors?

All STLQ015M31R 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 STLQ015M31R meets industry standards.

7.What is the process for return or replacement of STLQ015M31R?

All STLQ015M31R units undergo pre-shipment inspection (PSI). If there is an issue with STLQ015M31R, 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 STLQ015M31R part is unused and in its original packaging.

Return procedure for STLQ015M31R:

1.Submit a request within 90 days.

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

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