BAT54S 40V 100mA 200mW Schottky Diode SOT-23

BAT54S 40V 100mA 200mW Schottky Diode SOT-23 is a high-speed dual Schottky barrier diode integrated into a compact Surface Mount Device (SMD) package. This component features two series-connected Schottky diodes designed for efficient low-voltage signal clamping and reverse polarity protection circuit designs. Consequently, engineers frequently select this diode array for high-speed switching applications that demand extremely low forward voltage drop and fast recovery times. Furthermore, the ultra-small SOT-23 enclosure saves critical board real estate on high-density printed circuit boards. Therefore, incorporating this dual-diode solution into your hardware optimizes overall power efficiency while safeguarding sensitive logic inputs against voltage transients.

Key Features:

• Low Forward Voltage: Exhibits a minimal forward voltage drop of ≈ 0.32 V to minimize power dissipation.
• Dual Series Configuration: Integrates two Schottky diodes connected in series inside a single 3-pin package for versatile clamping designs.
• Fast Switching Speed: Delivers an ultra-fast reverse recovery time of under 5 ns, making it ideal for high-frequency signal lines.
• High Reliability: Features Guard-Ring construction for transient protection and improved long-term junction stability.
• Compact SOT-23 Packaging: Fits standard automated surface-mount manufacturing processes while reducing PCB footprint requirements.

Technical Specifications:

• Maximum Reverse Voltage (V_R): 40 V
• Continuous Forward Current (I_F): 100 mA
• Power Dissipation (P_tot): 200 mW
• Forward Voltage Drop (V_F): ≤ 1.0 V at 100 mA (≈ 0.32 V at 1 mA)
• Reverse Current (I_R): ≤ 2 μA at 30 V
• Reverse Recovery Time (t_rr): ≤ 5 ns
• Junction Temperature Range (T_j): -55 °C to ±150 °C

Mechanical Specifications:

• Package Type: SOT-23 (TO-236AB) Surface Mount
• Lead Format: Matte tin-plated Gull Wing terminals
• Flammability Rating: UL 94 V-0 molded plastic compound
• Moisture Sensitivity Level: MSL 1 according to J-STD-020

Dimensions:

• Overall Length: 2.90 mm ±0.10 mm
• Overall Width: 2.40 mm ±0.10 mm
• Body Height: 0.95 mm ±0.10 mm
• Lead Pitch: 1.90 mm nominal

Pinout and Wiring:

• Pin 1 (Anode 1): Connects to the anode of the first internal diode (Diode 1).
• Pin 2 (Cathode 2): Connects to the cathode of the second internal diode (Diode 2).
• Pin 3 (Anode 2 / Cathode 1): Acts as the common node connecting the cathode of Diode 1 and the anode of Diode 2.
• Clamping Wiring: However, to use this device as an I/O clamping diode, connect Pin 1 to GND, Pin 2 to VCC, and Pin 3 directly to the signal input line.

Datasheet Reference:

• Download Nexperia BAT54S Datasheet

Commonly Used in:

• Microcontroller Input Protection: Clamping voltage spikes on sensitive ADC or digital GPIO pins.
• High-Speed Data Lines: Suppressing noise and reverse transients on communication buses like I2C, SPI, and UART.
• Battery-Powered Electronics: Preventing accidental reverse battery insertion damage in handheld gadgets.

Applications:

• Voltage Clamping: Redirecting over-voltage transients safely away from delicate CMOS circuits.
• OR-ing Power Supplies: Steering low-voltage backup power sources cleanly into microcontroller supply rails.
• Ultra-Fast Switching: Executing high-frequency rectification steps in low-power DC-DC converters.

Equivalent Models:

• BAS70-04: Dual series Schottky diode offering higher reverse voltage (70V), although with slightly higher forward voltage.
• SD103AW: Single Schottky diode option offering high current capability in an SOD-123 surface-mount housing.
• BAT54A / BAT54C: Alternate internal configurations of the BAT54 family providing common-anode and common-cathode topologies.

Package Includes:

• 1 x BAT54S 40V 100mA 200mW Schottky Diode SOT-23