BCR431UXTSA1 - 36.5mA Linear LED Driver, 42V | Infineon
MPN: BCR431UXTSA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.49 | $4.90 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
Drop-in alternatives for BCR431UXTSA1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BCR432UXTSA1
β Drop-Inπ Reference alternative (not in catalog)
BCR430UXTSA1
β Drop-Inπ Reference alternative (not in catalog)
BCR431UE6327XTSA1
β Drop-Inπ Reference alternative (not in catalog)
BCR431UXTSA1XTSA1
β Drop-Inπ Reference alternative (not in catalog)
BCR431UW3XTSA1
β Drop-Inπ Reference alternative (not in catalog)
BCR431UXTSA1 Maximum Ratings & Electrical Characteristics
| Product Type | Linear LED Driver / Constant-Current Regulator |
| Number of Outputs | 1 |
| Topology | Linear |
| Dimming | No Dimming |
| Output Current | 36.5 mA (preset) |
| Input Voltage Range | 1.4 V to 42 V |
| Headroom Voltage | 0.6 V (typical) |
| Package | PG-SOT23-6 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Reverse Polarity Protection | Yes (integrated) |
BCR431UXTSA1 Pin Configuration
| Pin 1 | VS β Supply voltage input (1.4 V to 42 V) |
| Pin 2 | GND β Ground reference |
| Pin 3 | OUT β LED cathode connection (constant-current sink output) |
| Pin 4 | NC β Not connected (per datasheet) |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | NC β Not connected (per datasheet) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
BCR431UXTSA1 is suitable for 6 applications: Channel Letter LED Signage, Architectural Cove Lighting, Industrial 24V Signaling Strips, LED Backlight for Small Displays, Automotive Interior LED Lighting, Decorative String Lights.
Channel Letter LED Signage
The BCR431UXTSA1 drives individual LED modules inside illuminated channel letters where 24 V power feeds are common. Its 42 V input ceiling tolerates 24 V industrial rail transients, while the 36.5 mA preset current matches the typical forward current of medium-power white LEDs. Placing one driver per 1 to 3 LEDs keeps brightness uniform across long letter runs.
Recommended
Architectural Cove Lighting
Architectural cove lighting requires a slim, low-EMI driver that fits in a narrow aluminum extrusion. The BCR431UXTSA1's PG-SOT23-6 footprint (under 9 mmΒ²) and linear topology (no inductor, no switching noise) make it ideal for placing one driver per LED cluster in continuous cove runs fed by 24 V or 36 V supplies.
Recommended
Industrial 24V Signaling Strips
Factory-floor status strips run on 24 V industrial rails and demand a rugged, EMI-quiet driver. The BCR431UXTSA1's 1.4 V to 42 V input range absorbs 24 V rail transients without external protection, and its linear operation produces no conducted or radiated noise that could couple into nearby sensor cables.
Recommended
LED Backlight for Small Displays
Compact LCD and TFT backlights in appliances and instrumentation benefit from the BCR431UXTSA1's tiny footprint and stable 36.5 mA drive. With one driver per LED string, brightness uniformity is preserved across the panel, and the linear topology avoids the EMI that could interfere with the display's column driver signals.
Recommended
Automotive Interior LED Lighting
Although the standard BCR431UXTSA1 is industrial-grade, the same die is available in an automotive-qualified variant. The 42 V load-dump-tolerant input and integrated reverse-polarity protection suit door-pocket, footwell, and ambient lighting strips fed from the 12 V automotive bus, with the linear driver ensuring no switcher ripple reaches audio circuits.
Recommended
Decorative String Lights
Seasonal and architectural string lights use long LED strings on a single 24 V or 36 V supply. The BCR431UXTSA1's 36.5 mA preset matches common 5 mm through-hole LEDs, and its 42 V ceiling supports up to 12 LEDs in series per driver, simplifying wiring and reducing the number of drivers required per string.
Recommended
Recommended Products Summary
Engineering reference data for BCR431UXTSA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BCR432UXTSA1 | BCR430UXTSA1 | BCR431UE6327XTSA1 | BCR431UW3XTSA1 |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-SOT23-6 | PG-SOT23-6 - same | PG-SOT23-6 - same | PG-SOT23-6 - same | PG-SOT23-6 - same |
| Output Current | 36.5 mA | 50 mA | 15 mA | 36.5 mA | 36.5 mA |
| Input Voltage Range | 1.4 V to 42 V | 1.4 V to 42 V | 1.4 V to 42 V | 1.4 V to 42 V | 1.4 V to 42 V |
| Topology | Linear | Linear | Linear | Linear | Linear |
| Dimming | No | No | No | No | No |
| Automotive Grade | No | No | No | No | Yes (AEC-Q100) |
| Unit Price (qty 1) | USD 0.55 | [DATA_NEEDED] | [DATA_NEEDED] | USD 0.55 | [DATA_NEEDED] |
Key Differentiators
- Mid-current preset in a 6-pin SOT23-6 (vs BCR430UXTSA1)
- Automotive-grade sibling available (vs BCR431UW3XTSA1)
- Linear topology eliminates EMI (vs Switching LED drivers (e.g. AL8860))
Design Notes
Estimated: at VIN = 24 V and VLED stack = 18 V (6 white LEDs at 3 V each), power dissipation is (24 - 18) x 0.0365 = 0.219 W. With SOT23-6 ΞΈJA of approximately 200 C/W on a 1 oz 1 square-inch copper pour, junction rise is ~44 C, staying within the 150 C absolute maximum. For higher VIN-to-VLED differentials, increase copper area or add thermal vias to keep Tj below 125 C for derated operation.
Place the BCR431UXTSA1 as close as possible to the LED cathode to minimize the parasitic inductance and resistance of the OUT trace. Use a ground plane under the device to provide thermal spreading and a low-impedance return for the OUT current. Keep the input supply trace short and add a 100 nF ceramic decoupling capacitor close to the VS pin if the supply lead is longer than 25 mm.
Do not exceed the 42 V absolute maximum on the VS pin, including transient spikes from inductive loads on the same 24 V rail. Do not connect more LEDs in series than VIN_min minus the 0.6 V headroom allows, or the driver will fall out of regulation at low line. Avoid reversing VS and OUT, although internal reverse-polarity protection on the output limits damage to the device rather than the LEDs.
Compliance Information
RoHS and REACH compliant per Infineon product page. Standard BCR431UXTSA1 is not AEC-Q100 qualified - choose BCR431UW3XTSA1 for automotive applications.
