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ESD9B3.3ST5G

Single bidirectional ESD protection diode, 3.3V VRWM, 15 pF, ±18 kV, SOD-923, AEC-Q101

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Manufacturer Part：

ESD9B3.3ST5G

Package：

SOD-923 (1.0 x 0.6 mm)

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Description

The ESD9B3.3ST5G is a bidirectional TVS ESD protection diode from onsemi featuring 3.3 V working voltage, ±18 kV IEC 61000-4-2 ESD rating, 10.5 V clamping at 1 A IPP, and 15 pF junction capacitance. AEC-Q101 qualified and PPAP capable, it is designed for automotive and portable electronics. Housed in an ultra-small SOD-923 (1.0 x 0.6 x 0.4 mm) package with 100 nA max leakage, less than 1 ns response time, and 35 W peak pulse power rating, it operates over -55°C to +150°C junction temperature range.

The ESD9B3.3ST5G is a bidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed to protect voltage-sensitive components from electrostatic discharge (ESD) events. It features a working peak reverse voltage (VRWM) of 3.3 V, breakdown voltage (VBR) of 5.0 V minimum at 1 mA test current, and clamping voltage of 10.5 V maximum at IPP = 1 A (8/20 μs waveform).

The device provides IEC 61000-4-2 Level 4 ESD protection rated at ±18 kV for both contact and air gap discharge. It has a capacitance of 15 pF at 1 MHz, leakage current of 100 nA maximum at VRWM, and response time of less than 1 ns. The ESD9B3.3ST5G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications.

Packaged in the ultra-small SOD-923 (Case 514AB) with body dimensions of 1.0 x 0.6 x 0.4 mm, it is ideal for space-constrained portable applications such as cellular phones, MP3 players, and digital cameras. The device is Pb-free with matte tin lead finish, MSL-1 rated, and operates over a junction temperature range of -55°C to +150°C. Tape and reel packaging of 8000 units per reel.

The ESD9B3.3ST5G operates as a bidirectional TVS diode, providing ESD protection by clamping transient voltage excursions to safe levels.

Normal Operation: When the protected line voltage is within the working range (0 to ±3.3 V), the TVS diode is in its high-impedance state. The device presents minimal loading to the circuit with a leakage current of only 100 nA maximum and a junction capacitance of 15 pF, ensuring signal integrity on the protected line.

ESD Event: When an electrostatic discharge event occurs, the voltage on the protected line rises above the breakdown voltage (VBR ≥ 5.0 V). The TVS diode avalanches, transitioning from high impedance to low impedance within less than 1 nanosecond. The ESD current is diverted through the diode to ground, clamping the voltage at the protected node to 10.5 V maximum (at IPP = 1 A). This fast response and low clamping voltage prevent damage to downstream ICs.

Bidirectional Protection: The bidirectional structure contains two back-to-back Zener junctions, allowing the device to clamp both positive and negative transient events. This is essential for protecting AC-coupled or bidirectional signal lines where voltage can swing in either polarity.

Surge Current Handling: For IEC 61000-4-5 surge events (8/20 μs), the device can handle up to 2 A peak pulse current (IPP = 2 A) with a clamping voltage of 11.5 V. The peak pulse power dissipation is rated at 35 W (8/20 μs).

Thermal Behavior: Under transient events, the heat generated in the avalanche junction is dissipated through the lead frame and PCB. The thermal resistance (RθJA) is 400°C/W on FR-5 board. The device is designed to handle repeated transient events within its rated specifications without degradation.

Pin Name Type Default Function Description
1 Cathode / Anode I/O Protected Line Connection Bidirectional ESD clamp; connect to the signal or power line being protected
2 Anode / Cathode I/O Ground / Return Path Bidirectional ESD clamp; connect to system ground or return path
Application Description
Portable Consumer Electronics ESD protection for I/O ports in cellular phones, MP3 players, and digital cameras where board space is at a premium
Automotive Electronics AEC-Q101 qualified ESD protection for sensor lines, CAN bus, and LIN bus in automotive body electronics and infotainment
USB 2.0 Data Lines Single-channel ESD clamping for D+ and D- lines in USB 2.0 ports; 15 pF capacitance is compatible with USB 2.0 specification
Keypad and Button Interfaces ESD protection for human-interface GPIO lines exposed to frequent touch events
General-Purpose I/O Protection Low-cost ESD clamping for any 3.3V signal line requiring IEC 61000-4-2 Level 4 protection
Model Manufacturer Compatibility Key Difference
ESD9B5.0ST5G onsemi Pin-Compatible Same package and series, 5.0V VRWM instead of 3.3V; for 5V signal lines
SZESD9B3.3ST5G onsemi Pin-Compatible Automotive-specific prefix (SZ); unique site and control change requirements; identical electrical specs
PRTR5V0U2X NXP Functionally Similar Dual channel, 5V VRWM, 0.5 pF ultra-low capacitance, SOT-363; different voltage range and package
ESD204DQAR TI Functionally Similar Quad channel, 3.6V VRWM, 0.55 pF, USON-10; multi-channel solution with lower capacitance
PESD3V3L1BA NXP Functionally Similar Single channel, 3.3V VRWM, SOD-323; larger package with similar protection capability
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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