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BAV99 Dual Switching Diode — SOT-23, 70V, 200mA, Series Configuration (20-Pack)
BAV99 Dual Switching Diode SOT-23, 70V, 200mA, Series Configuration (20-Pack)
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BAV99 Dual Switching Diode — SOT-23, 70V, 200mA, Series Configuration (20-Pack)
The BAV99 contains two small-signal switching diodes in a single SOT-23 SMD package, connected in series with a common anode at pin 2. With a 70V reverse voltage rating, 200mA forward current, and 4ns reverse recovery time, it is widely used for ESD protection, signal clamping, voltage steering, and high-speed signal switching in compact SMD PCB designs. The series configuration makes it ideal for two-diode protection networks and OR-ing circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23 (SMD) |
| Configuration | Dual diode, series (common anode at pin 2) |
| Reverse Voltage (VR) | 70V |
| Forward Current (IF) | 200mA continuous |
| Forward Voltage (VF) | 0.715V typ. (IF=1mA) |
| Reverse Recovery Time (trr) | 4ns |
| Junction Capacitance (Cj) | 1.5pF typ. |
| Operating Temperature | -65°C to +150°C |
| Quantity | 20 pieces |
BAV99 Internal Configuration
| Pin | Connection |
|---|---|
| Pin 1 | Anode of D1 |
| Pin 2 | Cathode of D1 / Anode of D2 (common) |
| Pin 3 | Cathode of D2 |
Why Choose BAV99?
- Dual diodes in SOT-23 — two diodes in one package saves PCB space vs two discrete SOD-323 diodes
- 4ns recovery time — fast switching for high-frequency signal applications
- 1.5pF junction capacitance — minimal signal distortion at RF and high-speed digital frequencies
- 70V reverse rating — suitable for 5V, 12V, and 24V signal protection
- 20-pack value — sufficient for multiple ESD protection networks and repair stock
Compatible With / Common Use Cases
- ESD protection: Clamp GPIO pins of ESP32, STM32, or Arduino to VCC/GND to protect against electrostatic discharge
- Signal OR-ing: Combine two signal sources with diode OR logic (D1 and D2 as separate OR diodes)
- Voltage clamping: Clamp analog signal to reference voltage range before ADC input
- Polarity protection: Reverse polarity protection in low-current circuits
- High-speed switching: Signal switching in RF and high-frequency digital circuits up to 100MHz
Frequently Asked Questions
Q: What is the difference between BAV99, BAV70, and BAV99W?
A: BAV99 has two diodes in series (common anode at pin 2). BAV70 has two diodes in parallel (common cathode). BAV99W is the same as BAV99 but in a smaller SOD-323 package. Choose BAV99 for series/clamping applications, BAV70 for parallel/OR applications.
Q: Can BAV99 be used for ESD protection on Arduino GPIO pins?
A: Yes. Connect pin 1 to GND, pin 3 to VCC (5V), and pin 2 to the GPIO signal line. D1 clamps negative transients to GND, D2 clamps positive transients to VCC. This limits the GPIO voltage to the safe range (GND−0.7V to VCC+0.7V) during ESD events.
Q: What is the maximum switching frequency for BAV99?
A: With 4ns reverse recovery time and 1.5pF junction capacitance, BAV99 can switch reliably up to approximately 100MHz. For higher frequencies (above 500MHz), use a dedicated RF switching diode (BAP50, HSMP-3810) with lower capacitance.
Package Contents
- 20× BAV99 Dual Switching Diode (SOT-23)
