Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LDK120C10R

Name: LDK120C10R
Brand: STMicroelectronics
SKU: LDK120C10R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LDK120C10R

Manufacturer:: STMicroelectronics

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

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: LDK120C10R.pdf

Description:: IC REG LINEAR 1V 200MA SOT323-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,427

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LDK120C10R from STMicroelectronics is a 1.0 V fixed-output, 200 mA low-dropout linear regulator with 100 µA max quiescent current, 100 mV typical dropout at 100 mA, ±2.0% output voltage tolerance at 25 °C, and ultra-low noise (51 µV_RMS with 10 nF bypass). It operates from 1.9–5.5 V input and features logic-controlled shutdown (<1 µA OFF mode), internal thermal/current protection, and ceramic capacitor compatibility (C_OUT = 1 µF). Designed for space-constrained, battery-powered systems requiring stable low-noise bias.

For engineers reviewing the LDK120C10R datasheet, LDK120C10R pinout, LDK120C10R application, or LDK120C10R equivalent, this page delivers verified electrical specs, SOT323-5L package details, real-world use cases in portable electronics, and validated alternative parts - all grounded in ST's DS9378 Rev 9 production data.

Technical Context

The LDK120C10R implements a PMOS pass transistor architecture enabling ultra-low dropout and minimal quiescent current across temperature. Its internal bandgap reference and error amplifier deliver tight DC accuracy (±2.0% at 25 °C) and high PSRR (55 dB from 120 Hz to 10 kHz) without external compensation.

Logic-controlled enable (EN) provides precise power sequencing with defined thresholds (V_IL ≤ 0.4 V, V_IH ≥ 1.2 V), while integrated short-circuit current limiting (~400 mA) and thermal shutdown (160 °C, 20 °C hysteresis) ensure robust fault handling in compact portable designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.0 V ±2.0% at 25 °C - ensures stable core/bias rail for 1.0 V logic or analog circuitry.
Max Output Current	200 mA guaranteed - supports moderate-power peripherals like sensors or RF front-ends.
Dropout Voltage	100 mV typ. at 100 mA - enables operation down to VIN = 1.1 V, extending battery runtime in single-cell Li-ion/Li-poly systems.
Quiescent Current	≤100 µA max (−40 to 125 °C), <1 µA in OFF mode - minimizes standby drain in always-on subsystems.
Output Noise	51 µV_RMS (10 Hz–100 kHz, with 10 nF BYP) - meets stringent noise requirements for ADC references or RF synthesizers.
PSRR	55 dB (120 Hz–10 kHz) - suppresses ripple from noisy switching supplies feeding the LDO input.
Operating Temp	−40 °C to +125 °C junction - qualified for industrial and automotive cabin applications.

Pinout & Package

LDK120C10R is packaged in SOT323-5L - a 1.8 × 2.0 mm, 5-pin surface-mount package with exposed pad for thermal performance. Pin mapping is identical to SOT23-5L per ST's pin description table.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 1.9–5.5 V DC; requires local 1 µF ceramic decoupling (C_IN) close to pin.
2 (GND)	Power ground reference	Common return for IN, OUT, EN, and BYP; must connect to low-impedance PCB ground plane.
3 (EN)	Enable control input	Active-high logic: >1.2 V = ON, <0.4 V = shutdown; draws ≤100 nA when asserted.
4 (BYP/NC)	Bypass capacitor terminal (fixed version)	Optional 10 nF ceramic capacitor reduces output noise; if unused, leave floating (no PCB trace).
5 (OUT)	Regulated output	Delivers 1.0 V ±2.0%; requires 1 µF ceramic output capacitor (C_OUT) for stability.

Key Features

Feature	Design Value
Ceramic capacitor compatible	Stable with 1 µF C_OUT - eliminates need for costly tantalum or electrolytic capacitors, reducing BOM cost and board area.
Ultra-low noise (51 µV_RMS)	Enables clean power for precision analog circuits (e.g., ADCs, VCOs) without external filtering.
Logic-controlled shutdown	<1 µA total current in OFF mode - critical for long-term battery life in IoT edge nodes and wearables.
Wide input range (1.9–5.5 V)	Supports direct connection to single-cell Li-ion (3.0–4.2 V), LiFePO₄ (2.5–3.65 V), or 3.3 V system rails.
Thermal & short-circuit protection	Auto-recovery shutdown at 160 °C with 20 °C hysteresis and ~400 mA current limit - prevents damage during overload or poor heatsinking.

Applications

Mobile Phone Power Management

Digital Still Camera Sensor Bias

Use Scenario: Providing clean 1.0 V bias to image sensor analog front-end (AFE) and ISP core logic during active capture.

IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated 1.0 V rail with fast load transient response (<5 µs recovery) to handle pixel readout current spikes.

Use Value: 51 µV_RMS noise prevents fixed-pattern noise in raw image data; 100 mV dropout extends usable battery voltage down to 1.1 V.

Use Scenario: Powering CMOS image sensor's PLL and clock generation circuitry in compact point-and-shoot cameras.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent LDO supplying 1.0 V to timing-sensitive PLL blocks, rejecting switching noise from main DC-DC converter.

Use Value: 55 dB PSRR at 1–10 kHz suppresses DC-DC ripple; ±2.0% output accuracy maintains PLL lock stability across temperature.

Wearable Health Monitor MCU Core

Bluetooth LE Peripheral SoC

Use Scenario: Supplying 1.0 V core voltage to ultra-low-power ARM Cortex-M0+ microcontroller in continuous ECG monitoring patches.

IC Role / Device Role / Timing Role: Always-on LDO with <1 µA shutdown current, enabling multi-week battery life in sleep mode while supporting rapid wake-up.

Use Value: 100 µA max IQ preserves battery capacity; SOT323-5L footprint (1.8 × 2.0 mm) fits tight wearable PCB layouts.

Use Scenario: Regulating 1.0 V for Bluetooth 5.0 SoC radio and baseband sections in hearing aids and beacons.

IC Role / Device Role / Timing Role: High-PSRR LDO isolating RF section from digital noise on shared 3.3 V system rail, with fast enable/disable for duty-cycled operation.

Use Value: 55 dB PSRR prevents RX sensitivity degradation; 1 µA OFF mode enables 99% duty-cycle sleep for multi-year coin-cell operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, 1.0 V LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B102MR-G	1.0 V fixed, 200 mA, 60 µA IQ, 150 mV dropout @ 100 mA, requires 2.2 µF min C_OUT	Higher dropout limits usable input range; larger output cap increases board area	Prefer when lower IQ is critical and input voltage margin >150 mV is available.
Richtek RT9013-10GB	1.0 V fixed, 300 mA, 25 µA IQ, 250 mV dropout @ 100 mA, 20 µV_RMS noise (no BYP)	Lower noise but higher dropout; no bypass pin - less flexible noise tuning	Choose when lowest possible noise is mandatory and input headroom ≥250 mV exists.

Compared with XC6210B102MR-G and RT9013-10GB, LDK120C10R offers the best balance of ultra-low dropout (100 mV), industry-leading noise reduction via optional BYP pin, and proven thermal robustness - making it optimal for space- and battery-limited portable designs where input voltage margin is tight.

Availability

LDK120C10R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, wearable health monitors, and Bluetooth LE peripherals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for LDK120C10R 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.

LDK120C10R belongs to ST's LDK120 family of ultra-low-noise, low-IQ LDOs engineered specifically for battery-powered portable electronics demanding high efficiency, small footprint, and exceptional power integrity.

FAQ

What is the minimum input voltage required for LDK120C10R to maintain regulation at 200 mA load?

The minimum input voltage is calculated as V_OUT + V_DROP. At 200 mA and 40–125 °C, the maximum dropout is 300 mV per Table 4. Therefore, minimum VIN = 1.0 V + 0.3 V = 1.3 V. Below this, output voltage drops below specification.

Can LDK120C10R operate with a 1 µF ceramic output capacitor without a bypass capacitor?

Yes. The 1 µF C_OUT ensures stability per ST's design guidelines. The BYP pin is optional: adding a 10 nF capacitor reduces output noise to 51 µV_RMS; omitting it yields 148 µV_RMS (Table 4, footnote 2), which remains acceptable for many digital loads.

Is the SOT323-5L package RoHS-compliant and halogen-free?

Yes. ST specifies ECOPACK2 compliance for LDK120C10R, confirming full RoHS compliance (2011/65/EU) and halogen-free status per IEC 61249-2-21, as documented in ST's ECOPACK reference materials and packaging mechanical data section.

How does thermal performance differ between SOT323-5L and DFN6 packages for LDK120C10R?

SOT323-5L has R_thJA = 246 °C/W, while DFN6 (1.2 × 1.3 mm) achieves 237 °C/W - a marginal improvement. However, DFN6 offers superior R_thJC (104 vs. 134 °C/W), enabling better heat transfer to PCB copper when using thermal vias under the exposed pad.

LDK120C10R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

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):: 1V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 200mA

Current - Output:: 200mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 100 µA

PSRR:: 55dB (120Hz ~ 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-323-5

LDK120C10R FAQ

1.How can I place an order for LDK120C10R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK120C10R 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 LDK120C10R reliable?

The price and inventory of LDK120C10R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK120C10R is usually 5 days.

3.What payment methods are accepted for LDK120C10R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK120C10R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK120C10R?

LDK120C10R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK120C10R 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 LDK120C10R?

For technical support, including LDK120C10R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK120C10R requirements.

6.How does Aetrix verify that LDK120C10R is sourced from the original manufacturer or authorized distributors?

All LDK120C10R 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 LDK120C10R meets industry standards.

7.What is the process for return or replacement of LDK120C10R?

All LDK120C10R units undergo pre-shipment inspection (PSI). If there is an issue with LDK120C10R, 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 LDK120C10R part is unused and in its original packaging.

Return procedure for LDK120C10R:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…