Product Summary

The SD16R3 is a high-performance 3-terminal surge protection device for sensitive data lines. It operates at a nominal voltage of 16Vdc or 11Vac with a 400mA current rating. This module limits voltage spikes to under 25V, ensuring downstream equipment safety. Its compact design integrates a 4.7-ohm series resistor for effective signal conditioning. Engineers trust this component for reliable transient voltage suppression in industrial networks.

Expert Technical Evaluation & Performance Review

Precision Voltage Clamping for Sensitive Circuits

The SD16R3 delivers a voltage protection level (Up) of less than 25V when tested at 1kV/µs. This fast clamping action protects sensitive ICs from damage. The module’s rated voltage (MCOV) is 17V, providing a safe operating margin. Its low residual voltage of 40V at Isn ensures minimal stress on protected components. This performance makes it ideal for telecom and data acquisition systems.

Robust Electrical Characteristics for Continuous Duty

This device maintains a maximum leakage current of only 5µA, preserving system efficiency. The series resistance of 4.7 ohms per line helps match impedance and reduce signal reflection. With a bandwidth up to 50MHz, the SD16R3 supports high-speed digital signals without distortion. These specs allow it to handle nominal currents of 400mA while maintaining signal integrity.

Three-Terminal Topology for Enhanced Protection

The 3-terminal configuration of the SD16R3 provides a dedicated ground path for surge currents. This design improves common-mode noise rejection compared to 2-terminal alternatives. It allows for precise differential and common-mode voltage clamping. Engineers can easily integrate this component into balanced line interfaces. The result is a more robust defense against lightning-induced transients.

Product Procurement & Buyer Guide

Selecting the Right Voltage Protection Level

When sourcing the SD16R3, verify your system’s nominal voltage matches its 16Vdc rating. This part is perfect for 12Vdc or 24Vdc bus protection with proper derating. Its 11Vac rating also suits low-voltage AC control circuits. The MCOV of 17V ensures it does not clip normal operating signals. Always check the protection level against your equipment’s maximum input voltage.

Ensuring Current and Bandwidth Compatibility

Confirm your circuit’s normal operating current does not exceed the 400mA rating. The SD16R3 handles this current without degrading its protective elements. Its 50MHz bandwidth supports modern high-speed protocols like RS-485 or CAN bus. The 4.7-ohm series resistance is critical for impedance matching in transmission lines. Mismatched impedance can cause signal reflections and data errors.

Evaluating Leakage Current for Low-Power Systems

For battery-powered or energy-harvesting devices, the 5µA leakage current is a key advantage. This extremely low value prevents unnecessary power drain. It allows the SD16R3 to remain in circuit without affecting system efficiency. This makes it a superior choice for remote monitoring stations. You can leave the protection permanently connected without penalty.

Logistics & Standard Packaging Details

• One SD16R3 surge protection device per anti-static bag.
• Each bag includes a product specification label.
• Orders ship in sturdy, ESD-safe cardboard boxes.
• Express delivery is available via FedEx, UPS, and DHL.
• Standard lead time is 2-3 business days for stock items.