Input protection diodes are semiconductor devices that safeguard ADC chips from voltage transients and electrostatic discharge (ESD) by providing a low-impedance path for excess current.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Capacitance | 1pF to 10pF (low capacitance for high-speed ADCs) | |
| Response Time | <1ns | |
| Clamping Voltage | 6.5V to 40V at specified current | |
| Breakdown Voltage | 5V to 30V (typical for ADC applications) | |
| Peak Pulse Current | 1A to 5A (e.g., for 8/20μs surge) | |
| ESD Protection Level | IEC 61000-4-2, Level 4 (±30kV contact, ±30kV air) | |
| Operating Temperature | -55°C to +150°C |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
Integrated circuit that converts continuous analog signals into discrete digital values for processing by digital systems.
Electronic circuit component that amplifies weak signals and compares voltage levels within input conditioning systems.
The initial amplification stage in a differential receiver that processes the difference between two input signals while rejecting common-mode noise.
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Manufacturer profiles associated with Input Protection Diodes.
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ADC chips are highly sensitive to voltage fluctuations; without protection, transients from sources like motor noise or ESD can cause permanent damage, signal distortion, or data errors. Diodes prevent this by clamping excessive voltages.
Consider the ADC's maximum input voltage, signal frequency (choose low-capacitance diodes for high-speed ADCs), required ESD protection level (e.g., IEC 61000-4-2), and environmental conditions like temperature. Match the diode's breakdown voltage to slightly above the ADC's operating range.
Yes, if not selected properly. High-capacitance diodes can attenuate high-frequency signals, while slow response times may not clamp fast transients. Always verify diode specs against ADC bandwidth and signal requirements.
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