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

Infineon Technologies BCR421UE6327HTSA1

Name: BCR421UE6327HTSA1
Brand: Infineon Technologies
SKU: BCR421UE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR421UE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: SC-74, SOT-457

Datasheet:: BCR421UE6327HTSA1.pdf

Description:: IC LED DRVR LIN PWM 200MA SC74-6

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Inventory:56,095

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Product details

Overview

BCR421UE6327 from Infineon Technologies is a constant-current LED driver IC with low-side current control, preset 10 mA output, and digital PWM dimming support up to 10 kHz. It operates with supply voltage up to 40 V, delivers continuous output current up to 150 mA via external resistor (R_ext), and features a negative thermal coefficient of −0.2 %/K for inherent thermal derating. It is used in architectural LED lighting, retail fridge/freezer case illumination, and emergency exit signage.

For engineers reviewing the BCR421UE6327 datasheet, BCR421UE6327 pinout, BCR421UE6327 application, or BCR421UE6327 equivalent, this page provides verified electrical parameters, SC74 package layout, thermal behavior, automotive-grade AEC-Q101 qualification, and real-world dimming implementation guidance - all confirmed from Infineon's official Revision 2.2 datasheet (2022-12-08).

Technical Context

The BCR421UE6327 integrates a bipolar transistor-based current regulator with digital enable/dimming input, eliminating need for inductors, capacitors, or flyback diodes. Its EN pin accepts logic-level signals up to 3.3 V, enabling direct microcontroller interface without level-shifting.

It uses internal current-sensing and thermal feedback to maintain stable LED current across temperature and supply variations. The −0.2 %/K coefficient ensures predictable current reduction above 25 °C, supporting safe operation in enclosed fixtures without active cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current (preset)	10 mA fixed - enables direct drive of indicator LEDs without external resistor.
Max Continuous Output Current	150 mA with R_ext - supports higher-brightness 0.25 W LEDs in series strings.
Supply Voltage Range	Up to 40 V - accommodates 24 V industrial rails and 36 V LED string headroom.
PWM Dimming Frequency	Up to 10 kHz - avoids audible noise and enables smooth brightness control in human-visible applications.
Thermal Coefficient	−0.2 %/K - reduces output current linearly with junction temperature rise, preventing thermal runaway.
Package Thermal Resistance	R_thJS = 125 K/W - defines maximum pulse power handling per Figure 3-2 in datasheet.
AEC-Q101 Qualified	Yes - validated for automotive ambient temperature range (−40 °C to +125 °C) and reliability stress tests.

Pinout & Package

BCR421UE6327 is housed in a RoHS-compliant SC74 (SOT-26) surface-mount package - 3.0 mm × 1.7 mm × 1.1 mm, with 6 leads and gull-wing terminations optimized for automated assembly and thermal dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 (EN)	Digital enable input	Active-high logic input; accepts 3.3 V CMOS levels; enables/disables output current and supports PWM dimming up to 10 kHz.
2, 3, 5 (OUT)	Current-source output terminals	Internally paralleled collector outputs - provide low-impedance path to LED anode; share load current for higher drive capability.
4 (GND)	Power and signal reference	Common return for enable logic and output current; must be low-inductance connection to minimize switching noise.
6 (R_ext)	External current-set node	Connects to external resistor to scale output current beyond 10 mA; open-circuit yields 10 mA default.

Key Features

Feature	Design Value
Integrated low-side current regulation	Eliminates need for external sense resistor, op-amp, or MOSFET - reduces BOM count and PCB area by >3 components.
Digital PWM dimming interface	Direct 3.3 V logic compatibility enables MCU-driven brightness control without gate drivers or optocouplers.
Thermally self-protecting behavior	−0.2 %/K coefficient ensures automatic current reduction above 25 °C, avoiding external thermal shutdown circuitry.
SC74 package with 1 W dissipation capability	Enables 150 mA drive at 2 V LED drop in compact footprint - suitable for space-constrained lighting modules.
AEC-Q101 qualification	Validated for automotive interior lighting systems requiring extended temperature operation and long-term reliability.

Applications

Architectural LED Lighting

Retail Refrigeration Lighting

Use Scenario: Linear LED strips mounted on building façades and interior ceilings for ambient and accent illumination.

IC Role / Device Role / Timing Role: Constant-current source controlling individual 0.25 W LED segments with synchronized PWM dimming.

Use Value: Enables uniform brightness across long runs without current drift; −0.2 %/K coefficient prevents hot-spotting in sealed enclosures.

Use Scenario: Illumination inside commercial refrigerators and freezer display cases where condensation and wide temperature swings occur.

IC Role / Device Role / Timing Role: Low-side LED driver powering cold-resistant white LEDs with stable current despite −25 °C to +40 °C ambient variation.

Use Value: AEC-Q101 qualification ensures reliability under thermal cycling; SC74 package resists moisture ingress during defrost cycles.

Emergency Exit Signage

Channel Letter Advertising

Use Scenario: Battery-backed LED arrays in exit signs and stairwell markers requiring fail-safe illumination during power loss.

IC Role / Device Role / Timing Role: Primary current regulator operating from 12–24 V backup supply, with EN pin controlled by system supervisor IC.

Use Value: 40 V max supply rating allows use with 24 V battery stacks; 10 mA preset mode enables ultra-low-power standby indication.

Use Scenario: Front-lit aluminum channel letters in outdoor signage, driven by segmented LED strings behind translucent acrylic.

IC Role / Device Role / Timing Role: Parallel-configured current driver delivering 150 mA per segment for high-lumen density in narrow profiles.

Use Value: Multiple OUT pins (2/3/5) allow current sharing across parallel dies - improves thermal distribution and extends lifetime in sun-exposed housings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED current regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCR420UE6327	40 V EN-pin rating; no digital PWM input - uses analog enable only.	Suitable for on/off control only; cannot support dynamic dimming.	Select when system requires simple enable/disable without MCU involvement.
NSI45020AZT1G (onsemi)	Fixed 20 mA output; no R_ext adjustment; 45 V max supply; no PWM input.	Limited to low-current indicator LEDs; no dimming or current scaling capability.	Select for cost-sensitive status indicators where 20 mA suffices and dimming is unnecessary.

Compared with BCR421UE6327, BCR420UE6327 lacks PWM dimming but offers higher EN-voltage tolerance, while NSI45020AZT1G trades flexibility for lower unit cost and simpler layout - making BCR421UE6327 optimal for digitally controllable, thermally robust, medium-current LED systems.

Availability

BCR421UE6327 is available at Aetrix Electronics and suitable for architectural LED lighting, retail refrigeration lighting, and emergency exit signage requiring stable component supply, automotive-grade reliability, and consistent thermal performance across production batches.

Supply support for BCR421UE6327 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 AG is a German semiconductor manufacturer specializing in power management, sensor, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949 standards.

BCR421UE6327 belongs to Infineon's BCR family of linear LED drivers - designed specifically for cost-sensitive, space-constrained, and thermally demanding LED lighting applications in industrial and automotive environments.

FAQ

What is the maximum allowable voltage on the EN pin of BCR421UE6327?

The EN pin is rated for 3.3 V logic levels only - applying more than 3.3 V risks permanent damage. Unlike BCR420U, it does not support 40 V tolerant enable input. For higher-voltage enable signals, a level-shifter or resistive divider must be used before connecting to EN.

Can BCR421UE6327 drive multiple LEDs in series?

No - BCR421UE6327 is a low-side constant-current sink with fixed compliance voltage margin. It is intended for single-LED or parallel-LED configurations where total forward voltage remains ≤ (V_S − 2 V). Series strings exceeding ~3.5 V total V_F risk dropout and unstable regulation.

How does the −0.2 %/K thermal coefficient affect LED brightness over temperature?

At 85 °C junction temperature, output current drops to ≈ 88 % of its 25 °C value - a 12 % reduction. This directly lowers LED luminous flux proportionally, providing passive thermal protection without abrupt shutdown, ideal for enclosed fixtures where forced cooling is impractical.

Is R_ext required for basic operation of BCR421UE6327?

No - R_ext is optional. Leaving pin 6 open configures the device for its default 10 mA output. R_ext is only needed to scale current above 10 mA; values from 6 Ω to 20 Ω yield 150 mA to 75 mA respectively, per Figure 3-15 in the datasheet.

BCR421UE6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-74, SOT-457

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: -

Voltage - Supply (Max):: 4.5V

Voltage - Output:: 40V

Current - Output / Channel:: 200mA

Frequency:: -

Dimming:: PWM

Applications:: Lighting

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SC74-6

BCR421UE6327HTSA1 FAQ

1.How can I place an order for BCR421UE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR421UE6327HTSA1 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 BCR421UE6327HTSA1 reliable?

The price and inventory of BCR421UE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR421UE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCR421UE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR421UE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR421UE6327HTSA1?

BCR421UE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR421UE6327HTSA1 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 BCR421UE6327HTSA1?

For technical support, including BCR421UE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR421UE6327HTSA1 requirements.

6.How does Aetrix verify that BCR421UE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCR421UE6327HTSA1 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 BCR421UE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCR421UE6327HTSA1?

All BCR421UE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCR421UE6327HTSA1, 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 BCR421UE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCR421UE6327HTSA1:

1.Submit a request within 90 days.

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

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