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

Infineon Technologies BCR431UXTSA1

Name: BCR431UXTSA1
Brand: Infineon Technologies
SKU: BCR431UXTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR431UXTSA1

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: SOT-23-6

Datasheet:: BCR431UXTSA1.pdf

Description:: IC LED DRV LIN NO 36.5MA SOT23-6

Quantity:: RFQ Add To RFQ list

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Inventory:6,935

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Product details

Overview

BCR431UXTSA1 from Infineon Technologies is a linear constant-current LED driver IC in PG-SOT23-6 package, regulating up to 36.5 mA LED current with 200 mV saturation voltage at 32.8 mA, ±10% current precision, and smart thermal foldback. It operates from 6 V to 42 V supply and requires only one external R_set resistor for current programming-used in architectural lighting strips and retail channel letters.

For engineers reviewing the BCR431UXTSA1 datasheet, BCR431UXTSA1 pinout, BCR431UXTSA1 application, or BCR431UXTSA1 equivalent, key selection criteria include low-dropout operation under wide input voltage range, thermal foldback behavior vs. junction temperature, R_set-based current scaling ratio (~760:1), and SOT23-6 thermal performance on JEDEC-compliant PCBs.

Technical Context

The BCR431UXTSA1 integrates a bandgap reference, bias generator, and current mirror with thermal shutdown (TSD) circuitry. Its LED current is set by external R_set connected to RS pin, where I_LED ≈ 760 × I_RS; RS voltage remains stable at ~1.2 V across operating conditions.

Smart overtemperature protection reduces I_LED progressively above ~125 °C junction temperature without full shutdown; maximum power dissipation is thermally limited to 600 mW at T_A ≤ 36 °C on JESD 51-7 board, with R_thJA ranging from 182–288 K/W depending on PCB copper area.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	6 V to 42 V - supports wide-input industrial LED systems without pre-regulation
Max LED Current	36.5 mA - sufficient for medium-brightness single-string LED modules
Saturation Voltage	200 mV at 32.8 mA - enables >95% efficiency in low-V_f LED strings
Current Accuracy	±10% - ensures consistent brightness across units without trimming
RS Pin Voltage	1.172–1.22 V - stable reference for precise R_set-based current setting
Junction Temp Limit	150 °C max - defines safe continuous operation boundary with thermal foldback activation
Thermal Resistance	182 K/W (with 300 mm² GND copper) - guides PCB layout for thermal reliability

Pinout & Package

BCR431UXTSA1 uses the PG-SOT23-6 package (JEDEC TO-236-3 variant with 6 pins), featuring exposed thermal pad connected to GND for enhanced heat dissipation. Pin 2 (GND) serves as both electrical ground and primary thermal path to PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 N.C.	No connection	Internally unconnected; must remain floating or grounded per layout best practice
2 GND	Ground reference & thermal sink	Primary return path and thermal interface to PCB copper pour
3 RS	Current-setting reference output	Provides ~1.2 V reference; sets I_LED via external R_set (I_LED ≈ 760 × V_RS/R_set)
4 VS	Positive supply input	Accepts 6–42 V DC; internal regulator derives bias from this rail
5 N.C.	No connection	Internally unconnected; no routing required
6 LED	Constant-current output	Sinks regulated current to LED anode; voltage headroom limited to 200 mV max drop

Key Features

Feature	Design Value
Low saturation voltage	200 mV at 32.8 mA enables use with low-forward-voltage LEDs and extends usable supply headroom
Single-resistor current setting	R_set on RS pin eliminates need for feedback loop or op-amp, reducing BOM count and layout complexity
Integrated thermal foldback	Gradual I_LED reduction above ~125 °C prevents thermal runaway while maintaining partial illumination
High ESD robustness	6 kV HBM rating allows handling in standard assembly environments without special precautions
Industrial qualification	Qualified per JEDEC47/20/22 standards for reliability in extended temperature and humidity stress tests

Applications

Architectural Lighting

Retail Channel Letters

Use Scenario: Linear LED strips mounted on building façades or landscape features, powered from 24 V DC distribution rails.

IC Role / Device Role / Timing Role: Constant-current sink controlling individual LED segments to maintain uniform brightness despite V_f variation and ambient temperature drift.

Use Value: 200 mV dropout preserves >95% of supply voltage for LED string, enabling longer runs and tighter dimming control.

Use Scenario: Illuminated signage with acrylic or metal channel letters, requiring consistent luminance across multiple parallel LED strings.

IC Role / Device Role / Timing Role: Standalone current regulator per LED string, eliminating need for external MOSFETs or current-sense resistors.

Use Value: ±10% current accuracy ensures visual uniformity across signage modules without per-unit calibration.

LED Display Backlighting

Industrial Control Panel Indicators

Use Scenario: Small-format monochrome or RGB LED displays in factory HMIs, where space and thermal constraints limit component count.

IC Role / Device Role / Timing Role: Low-profile current source driving discrete LEDs behind segmented displays or status indicators.

Use Value: PG-SOT23-6 footprint and 182 K/W thermal resistance allow direct mounting on dense control panel PCBs without heatsinks.

Use Scenario: Status LEDs on PLC I/O modules or motor drives operating in high-ambient-temperature enclosures (up to 70 °C).

IC Role / Device Role / Timing Role: Thermally adaptive LED driver that maintains visibility while preventing overheating during sustained operation.

Use Value: Smart foldback reduces current gradually above 125 °C junction temp-preserving indicator function without abrupt failure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862SP-13	Switching buck LED driver; higher efficiency but requires inductor, diode, and compensation network	Preferred for >100 mA loads or battery-powered systems where efficiency >85% is critical	Select when input voltage varies widely or thermal budget is extremely tight; not drop-in for BCR431UXTSA1's linear topology
NSIC2020JB	Two-terminal constant-current regulator (CCR); no supply pin, self-biasing, ±5% tolerance	Better for ultra-simple, ultra-low-cost replacements where no external R_set adjustment is needed	Choose when fixed 20 mA current suffices and board space is constrained-no VS or RS pins required

Compared with AL8862SP-13 and NSIC2020JB, BCR431UXTSA1 uniquely balances simplicity (single R_set), precision (±10%), and thermal intelligence in a 6-pin SOT23, making it optimal for medium-current industrial LED arrays where layout density and thermal predictability outweigh peak efficiency needs.

Availability

BCR431UXTSA1 is available at Aetrix Electronics and suitable for architectural lighting, retail signage, and industrial HMI indicator systems requiring stable component supply, long-lifecycle support, and JEDEC-qualified reliability.

Supply support for BCR431UXTSA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The BCR431UXTSA1 belongs to Infineon's BCR family of linear LED drivers-designed specifically for cost-sensitive, thermally constrained industrial LED lighting where minimal external components and predictable thermal foldback are prioritized over switching efficiency.

FAQ

What is the minimum supply voltage required for BCR431UXTSA1 to regulate LED current?

The BCR431UXTSA1 requires a minimum supply voltage of 6 V to maintain regulation. Below this, the internal bias circuit cannot sustain stable RS pin voltage (~1.2 V) or accurate current mirroring, resulting in unregulated or rapidly decreasing I_LED. At 6 V, it delivers full 36.5 mA only if V_f of the LED string is ≤ 5.8 V.

Can BCR431UXTSA1 drive multiple parallel LED strings?

No-BCR431UXTSA1 is a single-channel constant-current sink. Driving parallel strings requires one IC per string to ensure current matching; sharing a single IC across parallel paths causes unequal current distribution due to V_f mismatch, risking thermal imbalance and premature LED failure.

How does the smart overtemperature protection behave during sustained high-temperature operation?

When junction temperature exceeds ~125 °C, BCR431UXTSA1 progressively reduces I_LED by lowering RS pin voltage-causing proportional current decrease in the LED path. At 150 °C, I_LED drops to ~50% of nominal; it never cuts off completely, preserving basic indicator functionality while preventing thermal damage.

Is a capacitor required at the LED pin, and why?

Yes-a 10 nF ceramic capacitor between LED and GND is recommended for installations with long PCB traces (>10 cm) or cables. It suppresses high-frequency ringing caused by parasitic inductance interacting with LED junction capacitance, preventing electromagnetic interference and false triggering of internal protection circuits.

BCR431UXTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 6V

Voltage - Supply (Max):: 42 V

Voltage - Output:: -

Current - Output / Channel:: 36.5mA

Frequency:: -

Dimming:: No

Applications:: Lighting

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23-6

BCR431UXTSA1 FAQ

1.How can I place an order for BCR431UXTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR431UXTSA1 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 BCR431UXTSA1 reliable?

The price and inventory of BCR431UXTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR431UXTSA1 is usually 5 days.

3.What payment methods are accepted for BCR431UXTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR431UXTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR431UXTSA1?

BCR431UXTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR431UXTSA1 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 BCR431UXTSA1?

For technical support, including BCR431UXTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR431UXTSA1 requirements.

6.How does Aetrix verify that BCR431UXTSA1 is sourced from the original manufacturer or authorized distributors?

All BCR431UXTSA1 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 BCR431UXTSA1 meets industry standards.

7.What is the process for return or replacement of BCR431UXTSA1?

All BCR431UXTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCR431UXTSA1, 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 BCR431UXTSA1 part is unused and in its original packaging.

Return procedure for BCR431UXTSA1:

1.Submit a request within 90 days.

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

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