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

STMicroelectronics LDK130C33R

Name: LDK130C33R
Brand: STMicroelectronics
SKU: LDK130C33R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDK130C33R

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LDK130C33R.pdf

Description:: IC REG LIN 3.3V 300MA SOT323-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,773

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Product details

Overview

LDK130C33R 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 power management for ADAS domain controllers and automotive point-of-load (P.O.L.) rails.

For engineers reviewing the LDK130C33R datasheet, LDK130C33R pinout, LDK130C33R application, or LDK130C33R equivalent, this page delivers verified electrical specs, SOT23-5L package details, automotive thermal performance (−40 °C to 125 °C), shutdown current <1 µA, and ceramic-capacitor compatibility - all critical for battery-powered and safety-critical embedded systems.

Technical Context

The LDK130C33R 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 line (1.9–5.5 V) variations.

Logic-controlled enable (EN) input supports active-high sequencing with 0.4 V max logic-low threshold and 1.2 V min logic-high threshold; 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 3.3 V ±2.0% at 25 °C - ensures stable supply for 3.3 V microcontrollers and sensors without external feedback.
Dropout Voltage	100 mV typ. at 100 mA - enables regulation from 3.4 V input down to 3.3 V output, critical for single-cell Li-ion or LiFePO₄ systems.
Quiescent Current	30 µA typ. (active), <1 µA (shutdown) - extends battery life in always-on automotive modules like telematics or body control units.
Output Noise	51 µV_RMS (10 Hz–100 kHz) - meets low-noise requirements for analog front-ends and RF power amplifiers in ADAS radar receivers.
Supply Rejection	55 dB (120 Hz–10 kHz) - suppresses ripple from switching pre-regulators, enabling clean LDO post-regulation in multi-rail automotive ECUs.
Operating Temp	−40 °C to +125 °C junction - qualified for under-hood and infotainment applications per AEC-Q100 Grade 1.
Input Voltage Range	1.9 V to 5.5 V - supports direct connection to 3.3 V or 5 V system rails and wide-input battery sources.

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 SOT23-5L).

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.
2 (GND)	Power ground reference	Common return path for input, output, and enable circuits; must be low-impedance.
3 (EN)	Enable logic input	Active-high control: <0.4 V = shutdown (<1 µA I_Q), >1.2 V = active; no pull-up required.
4 (BYP)	Bypass capacitor terminal (fixed version)	Optional 10 nF capacitor reduces output noise; floating if unused - no PCB routing needed.
5 (OUT)	Regulated output	Delivers 3.3 V ±2.0% at up to 300 mA; stable with 1–22 µF ceramic C_OUT.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for automotive use from −40 °C to +125 °C ambient, including lifetime reliability testing.
Ceramic capacitor compatibility	Stable with 1 µF C_OUT (no ESR requirement), reducing BOM count and board space vs. tantalum alternatives.
Low-noise regulation	51 µV_RMS noise and 55 dB SVR enable powering noise-sensitive analog/RF ICs without additional filtering.
Logic-controlled shutdown	EN pin draws <100 nA; allows system-level power sequencing and deep-sleep mode activation.
Internal protection	Thermal shutdown (160 °C) with 20 °C hysteresis and constant-current short-circuit limit (450 mA) prevent damage during faults.

Applications

ADAS Camera Module Power

Automotive Infotainment SoC Core Rail

Use Scenario: Powering image signal processor (ISP) and CMOS sensor in rear-view camera ECU.

IC Role / Device Role / Timing Role: Primary 3.3 V P.O.L. regulator supplying noise-sensitive analog front-end and digital core logic.

Use Value: 51 µV_RMS noise prevents image artifacts; 30 µA quiescent current minimizes standby drain during vehicle sleep mode.

Use Scenario: Providing clean 3.3 V supply to application processor I/O and memory interfaces in head-unit design.

IC Role / Device Role / Timing Role: Secondary LDO post-regulator after buck converter, ensuring voltage stability during dynamic load transients.

Use Value: 100 mV dropout enables operation from 3.4 V input during brown-out; 55 dB SVR rejects switching noise from upstream DC/DC.

Telematics Control Unit (TCU) RTC Backup

Body Control Module (BCM) Sensor Interface

Use Scenario: Supplying real-time clock (RTC) and secure element in LTE-connected TCU with battery backup capability.

IC Role / Device Role / Timing Role: Always-on low-I_Q regulator maintaining timekeeping and cryptographic functions during ignition-off.

Use Value: <1 µA shutdown current extends coin-cell or supercapacitor backup runtime beyond 1 year.

Use Scenario: Powering LIN transceivers and temperature/humidity sensors in door module or lighting controller.

IC Role / Device Role / Timing Role: Local 3.3 V rail generator with EN pin synchronized to microcontroller wake-up signals.

Use Value: Logic-enable sequencing eliminates inrush current; −40 °C to +125 °C rating covers full automotive ambient range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B332MR-G	300 mA, 25 µA I_Q, but only AEC-Q200 qualified (not Q100); 60 µV_RMS noise; SOT23-5 package.	Lacks full AEC-Q100 Grade 1 qualification - unsuitable for ASIL-B/C domains requiring validated automotive reliability.	Select only for non-safety-critical interior modules where Q200 suffices and lower I_Q is prioritized.
Analog Devices ADM7172ACPZ-3.3-R7	3.3 V fixed, 200 mA, 12 µA I_Q, 7 µV_RMS noise, but not AEC-Q100 qualified; 3 mm × 3 mm LFCSP package.	Superior noise performance but lacks automotive qualification and 300 mA output - insufficient for high-current ADAS loads.	Use only in non-automotive industrial or test equipment where ultra-low noise outweighs qualification needs.

Compared with XC6210B332MR-G and ADM7172ACPZ-3.3-R7, the LDK130C33R uniquely combines AEC-Q100 Grade 1 compliance, 300 mA output, and 51 µV_RMS noise in SOT23-5L - making it the only drop-in solution for production automotive P.O.L. rails requiring both safety certification and analog integrity.

Availability

LDK130C33R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LDK130C33R 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 linear regulator portfolio, engineered specifically for low-noise, low-quiescent-power point-of-load regulation in safety-critical vehicle subsystems.

FAQ

What is the minimum input voltage required for LDK130C33R to regulate 3.3 V output?

The LDK130C33R requires a minimum input voltage of 3.4 V to maintain regulation at 3.3 V output under 100 mA load, based on its 100 mV typical dropout voltage. At 300 mA, dropout rises to 200–400 mV depending on temperature, so ≥3.5 V input is recommended for full-load stability across −40 °C to 125 °C.

Can LDK130C33R operate with zero-output-capacitor (capless) configuration?

No. The LDK130C33R requires a minimum 1 µF ceramic output capacitor for stability, as confirmed in Section 6 (Stability region vs. C_OUT) of the datasheet. Capless operation is not supported and will cause oscillation or regulation failure.

Is the BYP pin mandatory to connect for noise reduction?

No. The BYP pin is optional: a 10 nF capacitor between BYP and GND reduces output noise by ~30%, but the device operates fully specified without it. If unused, the pin must be left floating with no PCB trace - not tied to GND or OUT.

Does LDK130C33R support reverse-voltage protection on the IN pin?

No. The LDK130C33R has no internal reverse-voltage protection. Absolute maximum rating specifies −0.3 V minimum IN voltage; applying reverse polarity will damage the device. External protection (e.g., series diode or MOSFET) is required in systems prone to battery reversal.

LDK130C33R 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):: 3.3V

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

LDK130C33R FAQ

1.How can I place an order for LDK130C33R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK130C33R 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 LDK130C33R reliable?

The price and inventory of LDK130C33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK130C33R is usually 5 days.

3.What payment methods are accepted for LDK130C33R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK130C33R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK130C33R?

LDK130C33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK130C33R 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 LDK130C33R?

For technical support, including LDK130C33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK130C33R requirements.

6.How does Aetrix verify that LDK130C33R is sourced from the original manufacturer or authorized distributors?

All LDK130C33R 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 LDK130C33R meets industry standards.

7.What is the process for return or replacement of LDK130C33R?

All LDK130C33R units undergo pre-shipment inspection (PSI). If there is an issue with LDK130C33R, 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 LDK130C33R part is unused and in its original packaging.

Return procedure for LDK130C33R:

1.Submit a request within 90 days.

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

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