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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

STMicroelectronics STCS05DR

Name: STCS05DR
Brand: STMicroelectronics
SKU: STCS05DR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STCS05DR

Manufacturer:: STMicroelectronics

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STCS05DR.pdf

Description:: IC LED DRVR LIN PWM 500MA 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:7,562

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Product details

Overview

STCS05DR from STMicroelectronics is a BiCMOS constant current LED driver IC delivering up to 0.5 A output with ±10% regulation accuracy, <0.5 V dropout voltage at 0.5 A, and integrated open-drain LED disconnection diagnostic. It operates from 4.5 V to 40 V input and supports PWM dimming for precise brightness control in low-voltage lighting systems.

For engineers reviewing the STCS05DR datasheet, STCS05DR pinout, STCS05DR application, or STCS05DR equivalent, this page provides verified electrical parameters, SO-8 package layout, real-world thermal performance data, and validated alternative drivers for LED current regulation in 5–24 V embedded lighting designs.

Technical Context

The STCS05DR integrates a high-voltage preregulator (45 V max), precision 100 mV feedback reference, and internal N-MOSFET driver with slope control via external capacitor. Its enable logic shuts down quiescent current to <1 µA, while the DISC pin asserts low when drain-to-ground voltage falls below 75 mV - indicating LED string open-circuit.

PWM dimming operates with 3 µs rise/fall delay (TD) and supports frequencies up to 50 kHz; above that, current waveform distortion occurs due to fixed switching timing. The FB pin sets current via external resistor (e.g., 0.2 Ω for 500 mA), with VFB tightly regulated at 90–110 mV across temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Up to 500 mA with ±10% tolerance set by external R_FB; enables precise LED string current matching.
Input Voltage Range	4.5 V to 40 V DC - supports wide-input industrial and automotive auxiliary rails without external buck conversion.
V_FB Reference	90–110 mV (typ. 100 mV) - allows ultra-low-value sense resistors (e.g., 0.2 Ω) minimizing power loss and heat.
Dropout Voltage	0.58–0.9 V at 500 mA - ensures stable regulation even with low headroom (e.g., 12 V input driving 3×3.6 V LEDs).
Quiescent Current	450–750 µA in active mode; <1 µA in shutdown - critical for battery-powered or always-on lighting controls.
Diagnostic Threshold	DISC asserts low when V_DRAIN < 75 mV - detects open LED strings before thermal runaway or system fault escalation.
PWM Delay (T_D)	3 µs (rising), 1.2 µs (falling) - enables synchronized multi-channel dimming with sub-microsecond timing alignment.

Pinout & Package

STCS05DR is housed in a standard SO-8 package (ECOPACK® compliant, 5.0 × 4.0 mm body, 1.27 mm pitch) with exposed pad for thermal enhancement. Pin 7 (N.C.) must remain floating per datasheet requirement.

Pin/Terminal	Circuit Role	Design Meaning
1 VCC	Supply input	Accepts 4.5–40 V DC; powers internal bias and gate driver; bypassed with 0.1 µF ceramic.
2 PWM	Digital dimming control	Active-high TTL/CMOS-compatible input; controls main switch on/off with <4 µs transition delay.
3 EN	Enable/shutdown	Active-high logic; pulls internal N-MOSFET gate low when low, reducing I_CC to <1 µA.
4 DRAIN	N-MOSFET drain terminal	Connects to LED anode; sustains up to 40 V; voltage monitored for open-load detection.
5 FB	Current sense feedback	Connects to source of external sense resistor; regulates current via 100 mV reference.
6 GND	Power and signal ground	Common return for VCC, FB, DISC, PWM, EN; requires low-impedance PCB plane.
7 N.C.	No connection	Mandatory floating pin; solder mask isolation required to prevent parasitic coupling.
8 DISC	Open-drain diagnostic flag	Sinks 5 mA when V_DRAIN < 75 mV; signals LED string failure to host controller.

Key Features

Feature	Design Value
Integrated N-MOSFET driver	Eliminates external high-side switch and gate driver, reducing BOM count and layout area in LED modules.
0.5 A constant current with ±10% accuracy	Ensures consistent LED luminance across units and temperature (-40°C to +125°C junction).
LED disconnection detection (75 mV threshold)	Provides fail-safe monitoring without additional comparators or microcontroller ADC overhead.
PWM dimming with sub-µs timing control	Enables flicker-free, high-frequency dimming (≤50 kHz) and synchronized multi-channel lighting control.
Low 0.58 V dropout at full load	Permits operation with minimal input-output differential - ideal for 5 V or 12 V bus-fed LED arrays.

Applications

Architectural Accent Lighting

Industrial Control Panel Indicators

Use Scenario: Low-profile LED strips powered from 12 V DC supply in commercial building façades and interior coves.

IC Role / Device Role / Timing Role: Constant-current source regulating 350 mA through 3-series white LEDs; DISC pin feeds fault status to building management system.

Use Value: Eliminates discrete current-setting resistors and thermal derating concerns - maintains ±10% luminance uniformity across 50+ fixtures.

Use Scenario: Status indicators on PLC I/O modules operating from 24 V industrial rail with reverse-polarity risk.

IC Role / Device Role / Timing Role: LED driver with EN-controlled on/off sequencing and built-in reverse-polarity protection via external BAT46 diode.

Use Value: Reduces component count by 4 parts per channel versus discrete FET + op-amp solution; DISC flag enables predictive maintenance alerts.

Smart Home Appliance Lighting

Automotive Interior Ambient Lighting

Use Scenario: RGBW backlighting in refrigerator control panels using 5 V USB-derived supply.

IC Role / Device Role / Timing Role: PWM-dimmable current source with 3 µs TD for synchronized color mixing; FB resistor sets 200 mA per channel.

Use Value: Enables smooth 0–100% dimming without audible noise or LED current overshoot - meets IEC 62368-1 EMC requirements.

Use Scenario: Footwell and map-light modules supplied from 12 V vehicle battery with transient voltage spikes up to 40 V.

IC Role / Device Role / Timing Role: High-voltage-tolerant LED driver with thermal shutdown (155°C) and open-load detection for safety-critical cabin lighting.

Use Value: Sustains operation during cold-crank (4.5 V) and load-dump (40 V) events without external TVS or LDO - improves ASIL-B readiness.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862SP-13	Switching buck regulator (not linear); 60 V input; 1.5 A max; requires external inductor and diode.	Better efficiency (>90%) at high input-output differentials; unsuitable for ultra-low-noise or EMI-sensitive environments.	Choose for >12 V input with >100 mA load where thermal dissipation is constrained.
LM3407MMX/NOPB	Linear regulator with 30 V max input; 1.5 A max; no integrated diagnostic pin; ±5% current accuracy.	Lacks open-drain DISC output and has higher dropout (1.25 V typical); simpler enable-only control.	Choose when diagnostic reporting is unnecessary and tighter current tolerance (±5% vs ±10%) is prioritized over fault detection.

Compared with AL8862SP-13 and LM3407MMX/NOPB, STCS05DR uniquely combines linear simplicity, integrated open-load detection, and SO-8 footprint - making it optimal for cost-sensitive, space-constrained 5–24 V LED systems requiring reliability-aware diagnostics.

Availability

STCS05DR is available at Aetrix Electronics and suitable for architectural accent lighting, industrial control panel indicators, and smart home appliance lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STCS05DR 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 analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STCS05 belongs to ST's LED linear driver product line, engineered specifically to replace discrete transistor-resistor current sources in low-voltage, medium-current (100–500 mA) lighting applications where integration, precision, and diagnostic capability are critical.

FAQ

What is the minimum input voltage required for STCS05DR to regulate 500 mA?

The STCS05DR requires a minimum input voltage of 4.5 V to maintain regulation at 500 mA output. At this current, the dropout voltage is 0.58–0.9 V, meaning the LED string forward voltage must be ≤3.6 V to ensure stable operation. Below 4.5 V, the device enters undervoltage lockout and disables output.

Can STCS05DR drive multiple parallel LED strings?

No - STCS05DR is designed for single-string constant-current operation. Driving parallel strings would cause current imbalance due to V_F mismatch, risking thermal runaway. For multi-string applications, one STCS05DR per string or a switching architecture (e.g., AL8862) is required.

How does the DISC pin behave during PWM dimming?

The DISC pin remains functional during PWM dimming: it continuously monitors V_DRAIN and pulls low whenever V_DRAIN < 75 mV, regardless of PWM state. This allows real-time open-load detection even while the LED is being pulsed - critical for safety-critical lighting systems.

Is external reverse-polarity protection mandatory for STCS05DR?

Yes - the datasheet explicitly requires reverse-polarity protection on the VCC pin using a series diode (e.g., BAT46). Without it, applying negative voltage to VCC can damage the internal BiCMOS structure. The LED string itself also requires breakdown voltage rating exceeding the reverse input magnitude.

STCS05DR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 40V

Voltage - Output:: -

Current - Output / Channel:: 500mA

Frequency:: -

Dimming:: PWM

Applications:: -

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STCS05DR FAQ

1.How can I place an order for STCS05DR through Aetrix?

Please submit a Request for Quotation (RFQ) for STCS05DR 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 STCS05DR reliable?

The price and inventory of STCS05DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STCS05DR is usually 5 days.

3.What payment methods are accepted for STCS05DR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STCS05DR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STCS05DR?

STCS05DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STCS05DR 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 STCS05DR?

For technical support, including STCS05DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STCS05DR requirements.

6.How does Aetrix verify that STCS05DR is sourced from the original manufacturer or authorized distributors?

All STCS05DR 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 STCS05DR meets industry standards.

7.What is the process for return or replacement of STCS05DR?

All STCS05DR units undergo pre-shipment inspection (PSI). If there is an issue with STCS05DR, 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 STCS05DR part is unused and in its original packaging.

Return procedure for STCS05DR:

1.Submit a request within 90 days.

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

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