BAT18,235

RF Diode Overview

The BAT18,235 is a planar high-performance band-switching diode manufactured by NXP Semiconductors. It is housed in a small rectangular SOT-23 surface-mount plastic package with three leads. The device supports a maximum continuous reverse voltage of 35 V and a continuous forward current of 100 mA. Key electrical characteristics include a low diode capacitance of up to 1.0 pF at 20 V reverse bias and 1 MHz frequency, and a low diode forward resistance of 0.7 Ω maximum at 5 mA forward current and 200 MHz. The junction temperature range extends from -55 °C to +125 °C.

RF Diode Feature Summary

• Planar silicon construction designed for high performance in RF applications
• Low diode capacitance suitable for high-frequency signal integrity
• Low forward resistance minimizes insertion loss during switching operations

RF Diode Applications

• Band switching circuits
• VHF/UHF RF switching above 10 MHz
• Low-loss pin diode applications

RF Diode Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to confirm packaging details such as tape and reel specifications. Confirm that the component status remains active or qualified for production before initiating design-in processes. Cross-reference the marking code '10' on the physical device to ensure authenticity and traceability to the correct datasheet revision.

RF Diode Selection Notes

Select this component when designing circuits requiring low capacitance and low forward resistance for RF band switching. Ensure the operating conditions remain within the specified absolute maximum ratings, particularly the 35 V reverse voltage limit and 100 mA forward current capacity. Consider the thermal resistance values if mounting density on FR4 substrates is high.

RF Diode Part Context

The BAT18 belongs to the family of silicon planar diodes originally developed by Philips Semiconductors. It is specifically engineered as a pin diode for use as a low-loss switch in Very High Frequency (VHF) and Ultra High Frequency (UHF) ranges. The SOT-23 package allows for compact surface-mount integration in modern electronic assemblies.

RF Diode Replacement Considerations

Check for direct replacements from other manufacturers offering identical SOT-23 pinouts and matching electrical parameters for RF switching. Verify compatibility regarding forward voltage drop and capacitance levels to maintain circuit performance without redesign.