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 LDK130C18R

Name: LDK130C18R
Brand: STMicroelectronics
SKU: LDK130C18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LDK130C18R

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LDK130C18R.pdf

Description:: IC REG LIN 1.8V 300MA SOT323-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,551

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

Product details

Overview

LDK130C18R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator delivering 300 mA output current with 100 mV typical dropout at 100 mA, 30 µA typical quiescent current, ±2.0% output voltage accuracy at 25 °C, and 51 µV_RMS output noise (10 Hz–100 kHz) - deployed in ADAS power management and automotive point-of-load systems.

For engineers reviewing the LDK130C18R datasheet, LDK130C18R pinout, LDK130C18R application, or LDK130C18R equivalent, this page provides verified electrical characteristics, SOT23-5L package mapping, automotive thermal performance data (−40 °C to 125 °C), and validated alternatives for battery-powered and safety-critical vehicle subsystems.

Technical Context

The LDK130C18R implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with 1 µF ceramic output capacitance. Its internal bandgap reference and error amplifier maintain tight regulation across load (1–300 mA) and input (1.9–5.5 V) variations.

Logic-controlled enable (EN) pin supports active-high operation with 1.2 V min high-threshold and 0.4 V max low-threshold, while integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typ.) ensure robust fault protection in automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8 V - eliminates external feedback resistors and reduces BOM count in space-constrained automotive modules.
Max Output Current	300 mA - sufficient to power microcontrollers, sensors, and CAN transceivers in ADAS ECUs without derating at 125 °C junction.
Dropout Voltage	100 mV typ. at 100 mA - enables regulation from 1.9 V input down to 1.8 V output, critical for Li-ion battery discharge tail-end operation.
Quiescent Current	30 µA typ. (active), <1 µA (shutdown) - extends battery life in always-on vehicle subsystems such as telematics wake-up circuits.
Output Noise	51 µV_RMS (10 Hz–100 kHz) - meets stringent noise requirements for analog sensor signal chains and RF front-end biasing.
Supply Rejection	55 dB (120 Hz–10 kHz) - suppresses ripple from switching DC/DC converters feeding the LDO input in multi-rail automotive power architectures.
Operating Temp	−40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and cabin-mounted electronic control units.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.9 mm × 1.6 mm footprint, 1.3 mm height, thermal pad optional (no exposed pad in standard variant). Compatible with reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 1.9–5.5 V DC; requires local 1 µF ceramic decoupling capacitor close to pin.
2 (GND)	Power ground reference	Common return path for IN, OUT, and EN; must be low-impedance connection to PCB ground plane.
3 (EN)	Enable logic input	Active-high control: ≥1.2 V enables regulator; ≤0.4 V forces shutdown (<1 µA I_Q).
4 (BYP)	Bypass capacitor terminal (fixed version)	Optional 10 nF capacitor reduces output noise; floating if unused - no routing or stubs permitted.
5 (OUT)	Regulated output voltage	Delivers stable 1.8 V ±2.0% to load; requires 1 µF ceramic output capacitor with ESR <1 Ω for stability.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for automotive use up to 125 °C ambient, including temperature cycling, HTOL, and ESD testing per ISO 16750.
Ultra-low-noise regulation	51 µV_RMS noise with 10 nF bypass capacitor - enables clean power for precision ADCs and image sensors in camera modules.
Ceramic capacitor compatibility	Stable with 1 µF X7R/X5R ceramic C_OUT - eliminates need for tantalum or aluminum electrolytic, reducing size and improving reliability.
Logic-controlled shutdown	EN pin draws <100 nA; allows microcontroller GPIO to manage system-level power sequencing without additional level shifters.
Thermal and short-circuit protection	Auto-recovery thermal shutdown at 160 °C with 20 °C hysteresis; constant-current limit clamps output at ~450 mA during overload.

Applications

ADAS Camera Module Power

Automotive Telematics MCU Supply

Use Scenario: Powers 1.8 V core rail of image signal processor (ISP) and CMOS image sensor in forward-facing ADAS camera.

IC Role / Device Role / Timing Role: Primary low-noise post-regulator downstream of buck converter; maintains <50 µV_RMS noise floor for 12-bit ADC sampling.

Use Value: Prevents fixed-pattern noise in captured video by suppressing switching ripple and thermal drift across −40 °C to 85 °C operating range.

Use Scenario: Supplies 1.8 V I/O and core voltage to LTE/GNSS SoC in vehicle telematics control unit with always-on cellular connectivity.

IC Role / Device Role / Timing Role: Always-on LDO with shutdown mode activated during deep sleep; enables sub-µA system standby current.

Use Value: Extends backup battery life from 72 to >200 hours by reducing quiescent current from 30 µA to <1 µA during GPS cold-start intervals.

Infotainment Display Interface

Electric Power Steering (EPS) Sensor Bias

Use Scenario: Provides regulated 1.8 V to MIPI D-PHY receiver circuitry in digital instrument cluster display driver IC.

IC Role / Device Role / Timing Role: Low-dropout buffer for high-speed serial interface; rejects noise from nearby DC/DC converters operating at 2 MHz.

Use Value: Eliminates bit errors in MIPI lanes by maintaining SVR >55 dB up to 10 kHz and ensuring <100 ps jitter on clock recovery paths.

Use Scenario: Supplies precision 1.8 V bias to Hall-effect position sensors in EPS motor control module.

IC Role / Device Role / Timing Role: Stable analog reference source with ±2.0% tolerance and <0.006 %/mA load regulation.

Use Value: Reduces torque-sensing error from ±1.2° to ±0.3° over full temperature range by minimizing output voltage drift under dynamic load steps.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TI TPS7A0518PDBVR	1.8 V fixed, 200 mA, 25 µA I_Q, but only AEC-Q100 Grade 2 (−40 °C to 105 °C); no bypass pin.	Limited to cabin-grade modules; insufficient for under-hood EPS or radar units requiring 125 °C operation.	Select when cost sensitivity outweighs junction temperature margin and noise performance is secondary.
Analog Devices ADM7172ACPZ-1.8-R7	1.8 V fixed, 300 mA, 150 µA I_Q, 125 °C rating, but 100 µV_RMS noise and requires ≥2.2 µF C_OUT.	Higher noise degrades SNR in camera ISPs; larger output cap increases PCB area and cost in compact modules.	Prefer only if higher PSRR (>70 dB) at >100 kHz is required, accepting trade-offs in quiescent current and layout density.

Compared with TPS7A0518PDBVR and ADM7172ACPZ-1.8-R7, the LDK130C18R uniquely balances AEC-Q100 Grade 1 compliance, 30 µA quiescent current, 51 µV_RMS noise, and SOT23-5L footprint - making it optimal for thermally constrained, noise-sensitive ADAS subsystems where size and efficiency are co-prioritized.

Availability

LDK130C18R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, infotainment display interfaces, and electric power steering sensor biasing requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LDK130C18R 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 LDK130 series belongs to ST's automotive-qualified power management portfolio, engineered specifically for low-noise, low-quiescent-current point-of-load regulation in safety-critical vehicle systems including ADAS, body electronics, and powertrain control.

FAQ

What is the minimum input voltage required for LDK130C18R to regulate 1.8 V output?

The LDK130C18R requires a minimum input voltage of 1.9 V to maintain regulation at 1.8 V output. At 100 mA load, its typical dropout is 100 mV, so VIN must exceed VOUT + VDROP - i.e., ≥1.9 V. Below this, the device enters dropout and output voltage drops linearly with input.

Can LDK130C18R operate with a 0.47 µF output capacitor?

No. The datasheet specifies a minimum 1 µF ceramic output capacitor (X5R/X7R) for stability across all loads and temperatures. Using 0.47 µF risks oscillation, especially under transient load conditions, as confirmed by Figure 24's stability region boundary requiring ≥1 µF at ESR <1 Ω.

Is the BYP pin mandatory for LDK130C18R operation?

No. The BYP pin is optional for noise reduction: a 10 nF capacitor lowers output noise to 51 µV_RMS, but the device operates fully functional without it. If unused, BYP must be left floating - no PCB trace or connection to GND or any other node is permitted.

Does LDK130C18R support reverse polarity protection on the IN pin?

No. The LDK130C18R lacks internal reverse-voltage protection. Absolute maximum rating for VIN is −0.3 V; applying reverse polarity will damage the IC. External protection - such as a series Schottky diode or ideal diode controller - must be added if reverse input is possible in the target application.

LDK130C18R 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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.4V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 120 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

LDK130C18R FAQ

1.How can I place an order for LDK130C18R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK130C18R 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 LDK130C18R reliable?

The price and inventory of LDK130C18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK130C18R is usually 5 days.

3.What payment methods are accepted for LDK130C18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK130C18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK130C18R?

LDK130C18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK130C18R 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 LDK130C18R?

For technical support, including LDK130C18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK130C18R requirements.

6.How does Aetrix verify that LDK130C18R is sourced from the original manufacturer or authorized distributors?

All LDK130C18R 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 LDK130C18R meets industry standards.

7.What is the process for return or replacement of LDK130C18R?

All LDK130C18R units undergo pre-shipment inspection (PSI). If there is an issue with LDK130C18R, 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 LDK130C18R part is unused and in its original packaging.

Return procedure for LDK130C18R:

1.Submit a request within 90 days.

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

Tech Hub

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…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…