STMicroelectronics STLQ015XG33R

Overview

STLQ015XG33R from STMicroelectronics is a 150 mA ultra-low-quiescent-current linear voltage regulator in SOT23-5L package, delivering fixed 3.3 V output with ±2% tolerance at 25 °C, 112 mV typical dropout at 150 mA, and 1.4 µA typical quiescent current under full load - designed for battery-powered microcontroller power supply and sensor biasing in portable electronics.

For engineers reviewing the STLQ015XG33R datasheet, STLQ015XG33R pinout, STLQ015XG33R application, or STLQ015XG33R equivalent, key selection criteria include shutdown current (≤200 nA at 125 °C), ceramic capacitor compatibility (1 µF min), thermal protection (170 °C shutdown), line/load regulation (±0.01 %/V, ±0.002 %/mA), and operating temperature range (–40 °C to 125 °C).

Technical Context

The STLQ015XG33R integrates a P-channel pass transistor with logic-controlled enable input (EN), internal current limiting, and thermal shutdown at 170 °C with 15 °C hysteresis. Its low-noise LDO architecture achieves 75 µVRMS output noise (10–100 kHz) and maintains stability with 0.47–10 µF ceramic output capacitors (ESR 0.056–6 Ω).

It operates across 1.5–5.5 V input while sustaining 3.3 V output with static line regulation of ±0.01 %/V and load regulation of ±0.002 %/mA. The device enters sub-1 nA OFF mode when EN = GND and exhibits 160 µs turn-on time to 95% of nominal output.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.95 mm × 1.60 mm footprint, 1.45 mm max height, ECOPACK®-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P332MR and RP111N331B-TR-F, STLQ015XG33R uniquely combines 150 mA capability, integrated EN control, thermal shutdown, and certified 1.4 µA loaded IQ - making it optimal for unattended, thermally constrained, battery-operated systems requiring full self-protection.

Availability

STLQ015XG33R is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial handheld scanners, and automotive cabin occupancy sensors requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STLQ015XG33R 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 analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STLQ015 series belongs to ST's ultra-low-power linear regulator product line, engineered specifically for energy-constrained portable and IoT devices where multi-year battery life and robust thermal behavior are mandatory design requirements.

FAQ

What is the minimum input voltage required for 3.3 V output regulation?

The STLQ015XG33R requires a minimum input voltage of 1.55 V at 150 mA load across –40 °C to 125 °C, but practical regulation starts at VIN ≥ VOUT + VDROP = 3.3 V + 0.112 V = 3.412 V. Below this, output drops linearly; datasheet guarantees 150 mA only when VIN ≥ 3.412 V.

Can the STLQ015XG33R be used with a 0.47 µF ceramic output capacitor?

Yes - the device is stable with output capacitors from 0.47 µF to 10 µF, provided ESR remains between 0.056 Ω and 6 Ω. A 0.47 µF X5R ceramic capacitor meets these criteria and is validated in Figure 15 (stability region) of the datasheet for all output voltages including 3.3 V.

Does the NC pin require any PCB layout treatment?

No - Pin 4 (NC) is internally unconnected and must remain electrically floating. Do not route traces to it, tie it to GND/VIN/EN, or place vias or test points. ST specifies no external connection; violating this may cause unpredictable behavior due to parasitic coupling or ESD path disruption.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 170 °C, the device shuts down output and holds OFF until temperature falls by ~15 °C (hysteresis). During shutdown, IQ drops to ≤200 nA. Recovery is automatic and does not require cycling EN - output resumes once Tj ≤ 155 °C, provided VIN and EN remain valid.