ESD5Z3.3T5G

ESD5Z3.3T5G is a small, unidirectional ESD protection diode (TVS) designed to guard 3.3V logic and IO lines from electrostatic discharges and fast transients. It clamps surge voltages to a safe level by shunting current to ground, protecting connected ICs.
Key points:
- Voltage rating: about 3.3V reverse standoff; clamps surges to a few volts above that.
- Package: tiny T5G/SMD package for close placement to inputs or connectors.
- Electricals: very fast response, low leakage in normal operation, and very low junction capacitance to minimize signal disruption on high-speed lines.
- Typical use: protect 3.3V microcontrollers, sensors, and data lines near external interfaces.
How to use:
- Place closest to the protected line or connector with a solid ground return.
- Ensure the clamping voltage and peak pulse current rating meet your device’s tolerances (refer to the specific datasheet for exact values).
If you need exact electrical specs (V_C, I_pp, capacitance), consult the ESD5Z3.3T5G datasheet for the current revision.

Concise features of ESD5Z3.3T5G:
- 3.3 V working voltage for single-line ESD protection
- Very low input capacitance (suitable for high-speed data lines)
- Unidirectional Zener-type clamp to protect I/O pins
- Fast response time to transients
- Low leakage in normal operation
- Small 3-pin package (T5G), suitable for compact designs
- RoHS-compliant; wide operating temperature range (typical industrial range)
- Suitable for protecting microcontrollers, USB/I2C/SPI lines, and other I/O interfaces
Notes: For exact ESD ratings (HBM/CDM, clamp voltages, capacitance), refer to the datasheet.

- Pin count: 3 pins (SOT-23-3 package)
- Function: 1-channel ESD protection diode (unidirectional) for a 3.3 V I/O line; clamps electrostatic discharges to ground to protect a low-voltage IC.

- Manufacturer: Littelfuse, Inc.
- What kind of company: A global electronics company specializing in circuit protection products (fuses, ESD protection diodes, TVS diodes, etc.), publicly traded on NASDAQ.

ESD5Z3.3T5G is a 3.3V low-capacitance unidirectional ESD protection diode. Applications:
- Protect 3.3V logic I/O on MCUs, SoCs, FPGAs, sensors, and memory
- Safeguard interface lines (I2C, SPI, UART, GPIO) from ESD
- Protect external connectors and cables (power/data interfaces, displays, sensors)
- Suitable for mobile/portable devices, wearables, consumer electronics, and industrial equipment using 3.3V logic
- Used in automotive 3.3V subsystems requiring ESD protection
Benefits: fast response, low leakage, minimal signal distortion due to low capacitance.

SC-70-3 (SOT-323) 3-pin package.