ZTX689B

Single Bipolar Transistors Overview

The ZTX689B is an NPN silicon planar medium-power high-gain transistor manufactured by Diodes Incorporated. It features a collector-emitter voltage (VCEO) of 20 V and a continuous collector current (IC) of 3 A. The device provides a static forward current transfer ratio (hFE) of 400 at IC = 2 Amps. Practical power dissipation is rated at 1.5 W, with a thermal resistance junction-to-ambient of 175 °C/W. Transition frequency (fT) is 150 MHz. Operating temperature range spans -55 to 200 °C.

Single Bipolar Transistors Feature Summary

• High gain capability with hFE of 400 at 2 Amps
• Very low saturation voltage for efficient switching
• Robust peak pulse current handling up to 8 A
• Wide operating temperature range from -55 to 200 °C

Single Bipolar Transistors Applications

• Darlington replacement circuits
• Flash gun converters
• Battery-powered circuits
• Motor drivers

Single Bipolar Transistors Procurement Notes

Verify the document revision status before procurement, as the datasheet explicitly states the ZTX689B is not recommended for new designs. Confirm availability through authorized channels, as end-of-life or obsolescence notices may apply. Ensure compliance with RoHS3 standards if required by your specific application environment. Cross-reference part numbers carefully to avoid confusion with similar variants in the ZTX series.

Single Bipolar Transistors Selection Notes

Select this component only for legacy designs or maintenance upgrades where the ZTX689B was originally specified. Evaluate the 20 V collector-emitter voltage limit against your circuit's maximum transient spikes. Consider the 3 A continuous current rating and ensure adequate heat sinking to manage the 1.5 W power dissipation within the specified thermal resistance limits. Verify that the E-Line package fits your PCB layout constraints.

Single Bipolar Transistors Part Context

The ZTX689B belongs to the ZTX series of NPN silicon planar transistors produced by Diodes Incorporated. These devices are designed for medium-power applications requiring high gain and low saturation voltage. The E-Line package offers a TO-92 compatible footprint, facilitating easy integration into existing through-hole designs. This series is commonly used in automotive and industrial control systems where reliability under varying temperatures is critical.

Single Bipolar Transistors Replacement Considerations

No direct public substitute part numbers are documented in the provided datasheet. Consult Diodes Incorporated directly for potential alternatives or updated components suitable for new designs, as the ZTX689B is not recommended for new implementations.