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

STMicroelectronics LD39015XG08R

Name: LD39015XG08R
Brand: STMicroelectronics
SKU: LD39015XG08R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39015XG08R

Manufacturer:: STMicroelectronics

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

Package:: SOT-563, SOT-666

Datasheet:: LD39015XG08R.pdf

Description:: IC REG LINEAR 0.8V 150MA SOT666

Quantity:: RFQ Add To RFQ list

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Inventory:2,097

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Product details

Overview

LD39015XG08R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator with fixed 0.8 V output, 80 mV typical dropout at 100 mA, 29 µVRMS output noise (no bypass capacitor), ±2.0% output accuracy at 25 °C, and logic-controlled shutdown. It operates from 1.5 V to 5.5 V input and is stable with 1 µF ceramic output capacitance - ideal for powering core rails in battery-operated microcontrollers and RF subsystems.

For engineers reviewing the LD39015XG08R datasheet, LD39015XG08R pinout, LD39015XG08R application, or LD39015XG08R equivalent, key selection criteria include dropout performance under light/heavy load, shutdown current (<1 µA), noise sensitivity in analog/RF supply domains, and SOT23-5L thermal behavior in space-constrained portable designs.

Technical Context

The LD39015XG08R uses a bandgap-referenced feedback loop with internal trimming to maintain 0.8 V output across -40 °C to 125 °C. Its enable-controlled NMOS pass transistor enables fast 30 µs turn-on and sub-1 µA OFF-mode current, while thermal shutdown (160 °C) and short-circuit current limiting (350 mA) ensure robustness in transient fault conditions.

Designed for high PSRR at low frequencies (65 dB @ 1 kHz), it rolls off above 10 kHz and delivers stable regulation with minimal external components: only 1 µF ceramic CIN and COUT required. Its 255 °C/W junction-to-ambient thermal resistance mandates careful PCB copper area allocation in sustained 150 mA operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 0.8 V ±2.0% at 25 °C - matches low-voltage core logic and SoC I/O rails requiring tight tolerance.
Dropout voltage	80 mV typ. at 100 mA - enables regulation from 0.88 V input, critical for single-cell Li-ion or coin-cell systems.
Quiescent current	18 µA typ. at no load; 38 µA typ. at 150 mA - minimizes standby power loss in always-on sensor nodes.
Output noise	29 µVRMS (1.1–100 kHz, VOUT = 0.8 V, no bypass cap) - suitable for noise-sensitive analog/RF power domains.
PSRR	65 dB @ 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input.
Enable threshold	VIL ≤ 0.4 V, VIH ≥ 0.9 V - compatible with 1.2 V/1.8 V logic without level-shifting.
Thermal shutdown	160 °C with 20 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.3 mm × 2.9 mm footprint, 0.95 mm pitch, exposed pad not electrically connected. RoHS-compliant, ECOPACK®2 rated.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	LDO input supply	Accepts 1.5–5.5 V; requires 1 µF ceramic decoupling close to pin for stability.
2 GND	Analog/digital ground reference	Common return path for input/output currents; must connect directly to low-impedance ground plane.
3 EN	Active-high enable control	Pull high ≥0.9 V to activate; pull low ≤0.4 V to enter <1 µA shutdown mode.
4 NC	No connection	Internally unconnected; leave floating or tie to GND per layout best practice (no electrical effect).
5 OUT	Regulated 0.8 V output	Delivers up to 150 mA; requires 1 µF ceramic capacitor with ESR <2.4 Ω for stability.

Key Features

Feature	Design Value
Ultra-low-noise regulation	29 µVRMS output noise without bypass capacitor - eliminates need for extra 2.2 µF ceramic, saving board space and BOM cost.
Sub-1 µA shutdown current	0.001–1 µA max. OFF-mode current - extends battery life in wake-on-event architectures (e.g., BLE sensors).
Ceramic-capacitor stability	Stable with 1 µF ±20% X5R/X7R output capacitor - avoids costly tantalum or polymer caps and simplifies sourcing.
Wide temperature operation	-40 °C to +125 °C junction range - supports automotive cabin modules and industrial edge controllers without derating.
Fast enable response	30 µs turn-on time from EN high to 95% VOUT - meets timing requirements for dynamic power sequencing in multi-rail systems.

Applications

Wearable Sensor Node

Low-Power MCU Core Supply

Use Scenario: Powering an ARM Cortex-M0+ MCU and MEMS accelerometer in a coin-cell-powered fitness tracker.

IC Role / Device Role / Timing Role: Primary 0.8 V core rail regulator with logic-controlled shutdown during sleep cycles.

Use Value: 18 µA quiescent current and <1 µA shutdown minimize average current draw, extending 200 mAh CR2032 life to >12 months.

Use Scenario: Delivering clean 0.8 V to the CPU core of an ultra-low-power IoT SoC operating in deep-sleep and active burst modes.

IC Role / Device Role / Timing Role: Low-noise, fast-response LDO enabling rapid wake-up from sub-µA retention states.

Use Value: 30 µs turn-on time ensures core voltage settles before first instruction fetch, eliminating boot delays.

Bluetooth LE Transceiver Bias

Industrial Temperature Sensor Signal Chain

Use Scenario: Supplying the RF section of a Bluetooth 5.0 transceiver where phase noise and EVM are sensitive to supply ripple.

IC Role / Device Role / Timing Role: Dedicated low-noise 0.8 V bias rail decoupled from digital switching noise.

Use Value: 29 µVRMS noise and 65 dB PSRR at 1 kHz prevent degradation of receiver sensitivity and transmit spectral mask compliance.

Use Scenario: Powering a precision delta-sigma ADC and analog front-end in a Class A industrial temperature transmitter (-40 °C to 85 °C ambient).

IC Role / Device Role / Timing Role: Stable, low-drift 0.8 V reference rail for ADC internal circuitry and sensor excitation.

Use Value: ±2.0% output tolerance over temperature and 80 mV dropout allow reliable operation even as input drops near end-of-battery life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B082MR-G	0.8 V fixed, 150 mA, 120 mV dropout @ 100 mA, 40 µVRMS noise, requires 2.2 µF ceramic COUT.	Higher dropout and noise limit use in ultra-low-VIN or RF-sensitive designs.	Select when lower cost is prioritized over noise/dropout; verify stability with larger output cap.
Richtek RT9013-08GB	0.8 V fixed, 250 mA, 150 mV dropout @ 150 mA, 45 µVRMS noise, 1 µA shutdown, but only rated to 85 °C ambient.	Not qualified for extended temperature industrial or automotive under-hood use.	Choose for consumer-grade portable devices where junction temperature stays below 105 °C.

Compared with XC6210B082MR-G and RT9013-08GB, the LD39015XG08R offers the lowest combined dropout-noise-shutdown profile across full industrial temperature range, making it optimal for space- and power-constrained embedded systems demanding long-term reliability.

Availability

LD39015XG08R is available at Aetrix Electronics and suitable for wearable electronics, battery-powered IoT endpoints, and industrial sensor transmitters requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for LD39015XG08R 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 chips for industrial, automotive, and consumer markets.

The LD39015 belongs to ST's high-efficiency, low-noise LDO family engineered specifically for ultra-low-power portable and embedded applications where battery longevity, signal integrity, and thermal resilience are critical.

FAQ

What is the minimum input voltage required for regulation at 0.8 V output?

The LD39015XG08R requires VIN ≥ VOUT + VDROP. With 80 mV typical dropout at 100 mA, minimum functional input is 0.88 V. However, the absolute minimum operating input is 1.5 V per datasheet specifications - below this, UVLO disables regulation regardless of load.

Can the LD39015XG08R be used with a 0.47 µF output capacitor?

No. The device requires ≥1 µF ceramic output capacitance for guaranteed stability across temperature and load. Using 0.47 µF risks oscillation, especially at higher temperatures or loads, as confirmed by the COUT stability region plot in Figure 7 of the datasheet.

Does the NC pin (Pin 4) require any PCB routing or grounding?

Pin 4 is internally not connected. ST recommends leaving it unconnected or optionally tying it to GND for mechanical reinforcement - neither choice affects electrical performance. No trace routing or thermal pad connection is needed.

How does thermal shutdown behave during continuous 150 mA operation at 85 °C ambient?

With RthJA = 255 °C/W and 150 mA load at 0.8 V output, power dissipation is ~60 mW. At 85 °C ambient, junction temperature rises to ~100 °C - well below the 160 °C shutdown threshold. Derating is unnecessary unless ambient exceeds 100 °C or PCB copper area is severely restricted.

LD39015XG08R 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):: 0.8V

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

LD39015XG08R FAQ

1.How can I place an order for LD39015XG08R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39015XG08R 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 LD39015XG08R reliable?

The price and inventory of LD39015XG08R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39015XG08R is usually 5 days.

3.What payment methods are accepted for LD39015XG08R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39015XG08R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39015XG08R?

LD39015XG08R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39015XG08R 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 LD39015XG08R?

For technical support, including LD39015XG08R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39015XG08R requirements.

6.How does Aetrix verify that LD39015XG08R is sourced from the original manufacturer or authorized distributors?

All LD39015XG08R 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 LD39015XG08R meets industry standards.

7.What is the process for return or replacement of LD39015XG08R?

All LD39015XG08R units undergo pre-shipment inspection (PSI). If there is an issue with LD39015XG08R, 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 LD39015XG08R part is unused and in its original packaging.

Return procedure for LD39015XG08R:

1.Submit a request within 90 days.

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

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