TDZ4V7J,115

The TDZ4V7J,115 from Nexperia is a high-performance planar zener diode in the compact SOD323F (SC-79) surface-mount package, offering 4.7V zener voltage with ±5% tolerance for voltage regulation and overvoltage protection applications. Built on advanced planar technology, this zener diode provides a sharp reverse breakdown characteristic with low dynamic resistance (15Ω max at 5mA test current), ensuring stable voltage regulation even with varying load currents. The 250mW power rating makes it suitable for low to medium power regulation tasks in space-constrained designs. The TDZ4V7J features low reverse leakage current and fast response time, making it effective for transient voltage suppression and ESD clamping applications as well. Fully qualified to AEC-Q101 automotive standards, with a -55°C to +150°C operating junction temperature range, this device is engineered for reliable performance in harsh automotive and industrial environments. The small SOD323F package measures just 1.9mm × 1.3mm × 0.95mm, saving valuable board space in high-density designs. The planar construction provides excellent long-term stability and uniform electrical characteristics across the operating temperature range. Supplied in 7″ tape-and-reel packaging with 3,000 pieces per reel, the TDZ4V7J is widely used in automotive electronics, power supply circuits, signal line protection, and consumer appliances requiring precise voltage reference and regulation.

The TDZ4V7J operates as a zener diode, exploiting the reverse breakdown phenomenon in a p-n junction to provide a stable reference voltage. When reverse-biased below the zener voltage (VZ = 4.7V), the diode conducts only a tiny leakage current. As the reverse voltage approaches and exceeds VZ, the diode enters the zener breakdown region (for voltages below approximately 5.6V, the breakdown mechanism is primarily the Zener effect; above 5.6V it transitions to avalanche breakdown). In the breakdown region, the voltage across the diode remains relatively constant over a wide range of reverse currents, making it useful as a voltage reference or regulator. The dynamic resistance (ZZ = 15Ω max) quantifies how much the zener voltage changes with current — lower dynamic resistance means better voltage regulation. The planar fabrication process creates a uniform p-n junction with controlled doping profiles, resulting in consistent breakdown voltage and low leakage. The diode is manufactured with a passivated junction and robust packaging to ensure long-term reliability and stability under thermal stress and mechanical vibration. In forward bias, the TDZ4V7J behaves like a regular silicon diode with a forward voltage drop of approximately 0.9V at 100mA, which can be useful in some applications (e.g., as a forward-biased reference diode). The device can handle non-repetitive surge currents up to 30W (10/1000µs pulse), providing protection against transient voltage spikes and ESD events.

Marking: The SOD323F package is marked with “D%” where % is the date/batch code. The cathode side is indicated by a line or band on the corresponding end of the package body. For zener regulator operation, the cathode is connected to the higher potential and the anode to the lower potential (reverse-biased configuration). Always verify polarity from the official datasheet before assembly.

• Voltage Regulation: Used as a shunt regulator to provide a stable 4.7V reference voltage for low-power circuits, sensor biasing, and precision measurement applications
• Overvoltage Protection: Provides voltage clamping and overvoltage protection for sensitive IC inputs, protecting against supply transients and ESD events in automotive and industrial systems
• Power Supply Circuits: Serves as a voltage reference in linear regulators, switching power supplies, and DC-DC converters for output voltage setting and error amplifier references
• Automotive Electronics: Deployed in BCM modules, sensor interfaces, and control units requiring AEC-Q101 qualified voltage regulation and transient protection
• Signal Line Protection: Protects data lines, sensor inputs, and communication interfaces from overvoltage transients and ESD discharges
• Battery Management: Used in battery chargers and battery protection circuits for voltage detection, overvoltage protection, and reference generation
• Telecommunications: Provides voltage reference and transient protection in telecom equipment, modems, routers, and networking devices
• Consumer Electronics: Found in TVs, audio equipment, home appliances, and portable devices for local voltage regulation and input protection