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

STMicroelectronics LD39015XG33R

Name: LD39015XG33R
Brand: STMicroelectronics
SKU: LD39015XG33R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39015XG33R

Manufacturer:: STMicroelectronics

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

Package:: SOT-563, SOT-666

Datasheet:: LD39015XG33R.pdf

Description:: IC REG LINEAR 3.3V 150MA SOT666

Quantity:: RFQ Add To RFQ list

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Inventory:3,166

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Product details

Overview

LD39015XG33R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator with fixed 3.3 V output, 80 mV typical dropout at 100 mA, ±2.0% output accuracy at 25 °C, and stable operation with 1 µF ceramic output capacitor. It serves as a precision power rail for noise-sensitive analog and RF circuitry in portable battery-powered systems.

For engineers reviewing the LD39015XG33R datasheet, LD39015XG33R pinout, LD39015XG33R application, or LD39015XG33R equivalent, key selection criteria include dropout voltage under load, shutdown current (<1 µA), output noise (29 µVRMS at 0.8 V), PSRR (65 dB @ 1 kHz), and SOT23-5L thermal performance (R_thJA = 255 °C/W).

Technical Context

The LD39015XG33R employs a bandgap reference with internal trimming (1.22 V) and feedback resistors (R1/R2) to regulate output precisely. Its enable-controlled shutdown logic accepts TTL/CMOS-compatible input levels (V_EN(H) ≥ 0.9 V, V_EN(L) ≤ 0.4 V) and achieves <30 µs turn-on time.

It integrates thermal shutdown (160 °C trigger, 20 °C hysteresis) and constant-current short-circuit protection (350 mA typical). Stability is guaranteed with 1 µF–22 µF ceramic capacitors having ESR ≤ 2.4 Ω across 100 kHz, eliminating need for tantalum or electrolytic types.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 3.3 V ±2.0% at 25 °C - ensures reliable logic-level compliance for 3.3 V I/O domains.
Dropout voltage	80 mV typ. at 100 mA - enables regulation from 3.38 V input, critical for single-cell Li-ion or Li-poly backup rails.
Quiescent current	18 µA typ. at no load - minimizes standby power loss in always-on sensor nodes or RTC supplies.
Output noise	29 µV_RMS (1.1–100 kHz, V_OUT = 0.8 V) - supports clean biasing of ADC references and RF synthesizers without bypass cap.
PSRR	65 dB @ 1 kHz - suppresses ripple from switching pre-regulators feeding the LDO input.
Operating temp	−40 °C to +125 °C junction - qualified for automotive cabin and industrial control environments.
Shutdown current	≤1 µA max. - enables deep-sleep modes in wearables and IoT edge devices.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.95 mm × 1.60 mm footprint, 1.45 mm height, ECOPACK® compliant, R_thJA = 255 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	LDO input supply	Accepts 1.5–5.5 V DC; requires 1 µF ceramic input capacitor for stability and transient response.
2 GND	Power ground reference	Must be low-impedance connection to system ground plane; shared return for IN and OUT paths.
3 EN	Logic-enable control input	Active-high; drives device ON when ≥0.9 V, OFF when ≤0.4 V; draws ≤100 nA leakage.
4 NC	No connect	Internally unconnected; must remain floating-no external tie or routing permitted.
5 OUT	Regulated output	Delivers 3.3 V @ up to 150 mA; stable with 1 µF ceramic capacitor (ESR ≤ 2.4 Ω @ 100 kHz).

Key Features

Feature	Design Value
Ultra-low-noise regulation	29 µV_RMS output noise without bypass capacitor-reduces BOM count and PCB area in space-constrained designs.
Sub-1 µA shutdown mode	Guaranteed ≤1 µA total current draw in OFF state-enables multi-year battery life in maintenance-free sensors.
Ceramic-capacitor compatibility	Stable with 1 µF C_OUT (1–22 µF range supported)-eliminates polarized capacitor aging and leakage concerns.
Wide input voltage range	1.5 V to 5.5 V operation-supports direct connection to single-cell Li-ion (3.0–4.2 V), NiMH, or regulated 5 V rails.
Integrated protection	Thermal shutdown (160 °C) + short-circuit current limiting (350 mA)-prevents failure during overload or ambient overtemperature.

Applications

Wearable Health Monitor

IoT Edge Sensor Node

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

IC Role / Device Role / Timing Role: Supplies ultra-clean 3.3 V bias to 16-bit SAR ADC and low-noise instrumentation amplifier.

Use Value: 29 µV_RMS noise prevents quantization error floor elevation; 18 µA quiescent current extends battery life beyond 12 months.

Use Scenario: LoRaWAN temperature/humidity node operating on AA alkaline cells.

IC Role / Device Role / Timing Role: Powers microcontroller, RF transceiver, and digital sensor interface during active transmit/receive bursts.

Use Value: 80 mV dropout enables >95% usable battery voltage range; 1 µA shutdown current preserves charge during 99.9% sleep duty cycle.

Automotive Cabin Camera

Industrial PLC I/O Module

Use Scenario: Always-on rear-view camera with wake-on-motion functionality.

IC Role / Device Role / Timing Role: Provides 3.3 V rail to image sensor and ISP ASIC during both active video streaming and standby monitoring.

Use Value: −40 °C to +125 °C operation ensures reliability in parked-car thermal extremes; EN pin enables synchronized power sequencing with SoC.

Use Scenario: DIN-rail mounted controller powering isolated RS-485 transceivers and analog input front-end.

IC Role / Device Role / Timing Role: Delivers stable 3.3 V to communication ICs and precision op-amps in electrically noisy factory environments.

Use Value: 65 dB PSRR at 1 kHz attenuates switching noise from adjacent 24 V DC-DC converters; thermal protection prevents latch-up during ambient overheating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P332MR	3.3 V fixed, 150 mA, 120 mV dropout @ 100 mA, 25 µA IQ, no EN pin	Lacks enable control and thermal shutdown; requires external shutdown circuitry	Choose only if enable function is unnecessary and board space permits discrete enable logic.
ROHM BD39015FVM-C	3.3 V fixed, 150 mA, 70 mV dropout @ 100 mA, 20 µA IQ, integrated EN, same SOT23-5L	Lower dropout but tighter output tolerance (±1.0%) and higher cost; identical pinout	Select when minimum input headroom is critical and ±1.0% accuracy justifies premium pricing.

Compared with XC6206P332MR and BD39015FVM-C, the LD39015XG33R offers balanced trade-offs: best-in-class noise performance (29 µV_RMS), robust protection set, and industry-standard enable threshold-making it optimal for mixed-signal battery systems where noise, efficiency, and reliability are co-prioritized.

Availability

LD39015XG33R is available at Aetrix Electronics and suitable for wearable health monitors, IoT edge sensor nodes, and automotive cabin cameras requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LD39015XG33R 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 LD39015 belongs to ST's high-efficiency, low-noise LDO portfolio targeting portable and battery-operated equipment where power integrity, thermal resilience, and minimal bill-of-materials are design imperatives.

FAQ

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

The LD39015XG33R requires VIN ≥ VOUT + VDROP to maintain regulation. With 80 mV typical dropout at 100 mA, minimum functional input is 3.38 V. Absolute minimum operating input is 1.5 V per datasheet, but regulation fails below ~3.38 V under load. UVLO turns off the device below 1.45 V (typical), preventing unstable operation.

Can the LD39015XG33R be used with a 10 µF ceramic output capacitor?

Yes-datasheet Section 6 (Figure 7) confirms stability with COUT = 1 µF to 22 µF ceramic capacitors, provided ESR remains ≤2.4 Ω at 100 kHz. A 10 µF X7R 0603 ceramic meets this requirement and improves load-transient response versus the minimum 1 µF case.

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

Pin 4 is internally unconnected and must remain electrically floating. Do not route traces to it, tie it to GND/VIN/EN, or place solder mask openings that could cause accidental shorts. Maintain standard SOT23-5L footprint clearance; no thermal pad or via is needed beneath this pin.

How does the LD39015XG33R behave during thermal shutdown?

When junction temperature reaches 160 °C (typical), internal thermal protection disables the pass transistor, dropping output to near zero volts while drawing <1 µA. Output resumes automatically after temperature falls by ~20 °C hysteresis. No latch-up occurs, and the device cycles safely under sustained overload.

LD39015XG33R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOT-563, SOT-666

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.1V @ 100mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: 70 µA

PSRR:: 65dB ~ 62dB (1kHz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-666

LD39015XG33R FAQ

1.How can I place an order for LD39015XG33R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39015XG33R 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 LD39015XG33R reliable?

The price and inventory of LD39015XG33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39015XG33R is usually 5 days.

3.What payment methods are accepted for LD39015XG33R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39015XG33R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39015XG33R?

LD39015XG33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39015XG33R 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 LD39015XG33R?

For technical support, including LD39015XG33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39015XG33R requirements.

6.How does Aetrix verify that LD39015XG33R is sourced from the original manufacturer or authorized distributors?

All LD39015XG33R 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 LD39015XG33R meets industry standards.

7.What is the process for return or replacement of LD39015XG33R?

All LD39015XG33R units undergo pre-shipment inspection (PSI). If there is an issue with LD39015XG33R, 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 LD39015XG33R part is unused and in its original packaging.

Return procedure for LD39015XG33R:

1.Submit a request within 90 days.

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

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