BAT56 Silicon Epitaxial Schottky Barrier Diode

Overview

The BAT56 is a silicon epitaxial Schottky barrier diode designed for high-frequency switching applications, voltage clamping, and reverse polarity protection. Its Schottky barrier construction provides extremely fast switching speeds and low forward voltage drop, making it ideal for high-efficiency circuits. The device is commonly used in power supplies, DC-DC converters, and RF applications where minimal power loss is critical.

Features

• Low leakage current: Ensures minimal power loss in reverse bias conditions, improving overall circuit efficiency.
• Low turn-on voltage: Typically 0.3V to 0.5V, reducing conduction losses compared to standard PN-junction diodes.
• High breakdown voltage: Robust reverse voltage capability for reliable operation in demanding environments.
• Fast switching characteristics: Virtually no reverse recovery time due to Schottky barrier construction.
• High temperature stability: Maintains consistent performance across a wide operating temperature range.
• Small form factor: Available in compact SMD packages for space-constrained applications.

Applications

Primary Applications

• High-frequency rectification in switching power supplies
• Reverse polarity protection circuits
• Voltage clamping and transient suppression
• RF detection and mixing circuits
• DC-DC converter output rectification

Secondary Applications

• Sample-and-hold circuits
• Signal demodulation
• Power OR-ing circuits
• Battery charging circuits

Electrical Characteristics

(Typical values at 25°C unless otherwise specified)

Absolute Maximum Ratings

• Peak Repetitive Reverse Voltage (VRRM): 30V
• Average Rectified Forward Current (IF(AV)): 100mA
• Peak Forward Surge Current (IFSM): 1A (pulse width = 1s)
• Operating Junction Temperature Range (TJ): -65°C to +125°C
• Storage Temperature Range (TSTG): -65°C to +150°C

Forward Characteristics

• Forward Voltage (VF): 0.32V typical at 0.1mA, 0.7V maximum at 100mA
• Forward Current (IF): 100mA continuous
• Temperature Coefficient: -1.5mV/°C typical

Reverse Characteristics

• Reverse Leakage Current (IR): 0.2μA typical at 10V, 5μA maximum at 30V
• Breakdown Voltage (VBR): 40V minimum
• Junction Capacitance (CJ): 2pF typical at 0V, 1MHz

Dynamic Characteristics

• Reverse Recovery Time (trr): Essentially negligible (Schottky characteristic)
• Switching Speed: Typically less than 1ns

Package Information

SOT-23 Package

• Package Type: SOT-23 (TO-236AB)
• Dimensions: 2.9mm × 1.6mm × 1.1mm (L×W×H)
• Termination: 3-pin (common cathode configuration)
• Weight: Approximately 8mg
• Moisture Sensitivity Level (MSL): MSL 1 (unlimited floor life)

Mechanical Characteristics

• Termination Finish: Matte tin (Sn) over copper
• Solderability: Excellent, compatible with lead-free soldering processes
• Mounting: Surface mount (SMD)
• PCB Land Pattern: Compliant with IPC-7351 standards

Reliability Data

• ESD Rating: Human Body Model (HBM) Class 1C (>1000V)
• Flammability Rating: UL 94 V-0 compliant
• MIL-STD-750 Test Method: Passes Method 1021 (Moisture Resistance)
• Mean Time Between Failures (MTBF): >1,000,000 hours at 25°C

Thermal Characteristics

• Thermal Resistance, Junction-to-Ambient (RθJA): 357°C/W
• Thermal Resistance, Junction-to-Lead (RθJL): 125°C/W
• Maximum Power Dissipation (PD): 250mW at 25°C ambient temperature

Handling and Storage Recommendations

• Store in dry, non-corrosive environment at temperatures between -65°C and +150°C
• Use standard ESD precautions during handling and assembly
• Recommended reflow profile per JEDEC J-STD-020
• Clean with isopropyl alcohol if contamination occurs

Design Considerations

PCB Layout Guidelines

• Maintain adequate clearance between pads to prevent solder bridging
• Use thermal relief patterns for hand soldering operations
• Ensure proper grounding for RF applications

Thermal Management

• For high current applications, consider using multiple diodes in parallel
• Use copper pours or thermal vias to improve heat dissipation
• Monitor junction temperature in high ambient temperature environments

Environmental Compliance

• RoHS 3 (2015/863/EU) compliant
• REACH SVHC compliant
• Halogen-free according to IEC 61249-2-21