BAT41

The STMicroelectronics BAT41 is a high-speed, low-capacitance Schottky barrier diode designed for fast switching, low forward voltage drop, and minimal reverse leakage. Its silicon Schottky construction enables high efficiency in rectification, clamping, and protection applications. The BAT41 is suitable for surface-mount and through-hole PCB layouts, offering a compact package footprint and robust electrical performance. It is commonly used in high-frequency rectifiers, voltage clamping, mixer circuits, and fast switching logic circuits. The diode’s low forward voltage, fast recovery, and low junction capacitance make it ideal for both analog and digital high-speed applications.

## Key Features

* Device Type: Schottky Barrier Diode
* Polarity: Anode-Cathode standard configuration
* Package Type: SOD-123 for surface-mount and SOT-23 variant available
* Maximum Reverse Voltage (V_R): 100 V
* Average Forward Current (I_F(AV)): 200 mA continuous
* Peak Forward Surge Current (I_FSM): 600 mA for 1 µs pulse
* Forward Voltage Drop (V_F): 0.55 V typical at 200 mA
* Reverse Leakage Current (I_R): 25 µA typical at 25°C, 250 µA at 100°C
* Fast Switching Speed: Reverse recovery time negligible (<5 ns)
* Low Junction Capacitance: 4 pF typical at 0 V, f = 1 MHz
* Operating Temperature Range (T_J): -65°C to +150°C
* Storage Temperature Range (T_STG): -65°C to +150°C
* Lead-Free RoHS Compliant: Environmentally safe for modern electronics

## Electrical Characteristics

* Maximum Repetitive Reverse Voltage (V_RRM): 100 V
* DC Reverse Voltage (V_R): 100 V
* Forward Continuous Current (I_F(AV)): 200 mA
* Non-Repetitive Peak Surge Current (I_FSM): 600 mA, 1 µs pulse
* Forward Voltage (V_F): 0.55 V typical, 0.75 V maximum at I_F = 200 mA
* Reverse Leakage Current (I_R): 25 µA typical at V_R = 20 V and T_A = 25°C
* Junction Capacitance (C_J): 4 pF typical at 0 V, f = 1 MHz
* Thermal Resistance (R_θJA): 500°C/W typical for SOD-123 package in free air
* Reverse Recovery Time (t_rr): Negligible (<5 ns), ideal for high-speed switching applications
* Temperature Coefficient: Forward voltage decreases with temperature at approximately -2 mV/°C

## Functional Description

The BAT41 operates as a high-speed Schottky diode optimized for switching and rectification in low-current, high-frequency applications. Its Schottky junction structure ensures low forward voltage drop, reducing conduction losses and improving efficiency in rectification circuits. The diode exhibits negligible reverse recovery, making it suitable for high-speed logic, RF mixing, and signal clamping.

Due to its low junction capacitance, the BAT41 can operate at MHz frequencies without significant signal distortion or loss, providing reliable performance in RF circuits, mixers, and voltage clamp networks. The diode is also suitable for protecting sensitive electronics from voltage spikes due to its fast response and low leakage characteristics.

The BAT41 can be used in series or parallel configurations for applications requiring higher voltage or current handling, with careful thermal management and layout considerations. Its compact SOD-123 package allows for high-density PCB designs, minimizing parasitic inductances and improving high-frequency performance.

## Applications

* High-speed switching in digital and analog circuits
* Voltage clamping and transient protection
* RF mixer circuits and detectors
* Low-current rectification in power supplies and AC-DC converters
* Signal demodulation and waveform shaping
* Fast logic level conversion and interfacing
* Battery-powered devices requiring low forward voltage drop for efficiency
* Surface-mount, space-constrained circuits in portable electronics

## Package and Mechanical Information

* Package Type: SOD-123 surface-mount
* Dimensions: Body length 2.8 mm, width 1.6 mm, height 1.1 mm typical
* Lead Pitch: 1.9 mm typical
* Mounting: Standard reflow soldering recommended for surface-mount applications
* Mechanical Robustness: Designed for automated assembly with reliable solderability
* Thermal Dissipation: Low power device; PCB copper area recommended to improve heat spreading
* Moisture Sensitivity: Compatible with standard MSL 1 storage conditions

## Design Considerations

* Ensure maximum continuous current does not exceed 200 mA to prevent thermal runaway
* Account for forward voltage drop in low-voltage circuits to maintain efficient operation
* Consider series or parallel arrangements cautiously for applications exceeding single-diode ratings
* Minimize parasitic inductance in high-frequency layouts to reduce voltage overshoot and ringing
* Implement proper PCB creepage and clearance if used in circuits with higher voltages to prevent arcing
* Low reverse leakage ensures minimal standby power loss in battery-powered applications

## Reliability and Compliance

* Operating Temperature Range: -65°C to +150°C
* Storage Temperature Range: -65°C to +150°C
* ESD Protection: Human Body Model ±2 kV, Machine Model ±200 V
* RoHS Compliant: Lead-free and environmentally compliant
* High MTBF: Suitable for continuous operation in industrial and consumer electronics
* Automotive Grade Applications: Compatible with non-critical low-voltage automotive circuits

## Summary

The STMicroelectronics BAT41 is a high-speed, low-leakage Schottky diode suitable for high-frequency, low-current applications. With a 100 V reverse voltage rating, 200 mA forward current, and negligible reverse recovery, it provides fast switching, high efficiency, and reliable operation. Its low forward voltage drop, small junction capacitance, and compact SOD-123 surface-mount package make it ideal for rectification, voltage clamping, RF signal processing, and logic-level conversion in industrial, consumer, and portable electronic systems. The BAT41 delivers robust performance across a wide temperature range, ensuring reliability in demanding environments.