ZDT749TA

Overview

The ZDT749TA is a dual PNP medium power transistor manufactured by Diodes Incorporated, housed in an SM-8 (SOT-223) surface-mount package. It features two independent PNP transistors within a single component. Key electrical ratings include a collector-emitter voltage of -25 V and a continuous collector current of -2 A per die. The device supports a total power dissipation of up to 2.75 W when both dies are active equally at 25°C ambient temperature. Transition frequency reaches 160 MHz, with switching times of 40 ns turn-on and 450 ns turn-off under specified test conditions.

Feature Summary

• Dual configuration integrating two independent PNP transistors into a single compact package for space-efficient designs.
• Medium power handling capability suitable for applications requiring higher current drive than standard small-signal devices.
• Surface-mount construction facilitates automated assembly and integration into modern PCB layouts.

Applications

• General-purpose switching circuits requiring dual PNP control.
• Driver stages for relays or solenoids where compact dual-channel logic is needed.
• Power management modules utilizing medium-current PNP configurations.

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package variant and tape/reel specifications. Ensure compatibility with peak pulse current limits during transient events. Confirm thermal management requirements align with derating curves provided in the datasheet for reliable operation under varying ambient temperatures.

Selection Notes

Select this component when a dual PNP configuration is required in a surface-mount form factor. Evaluate thermal resistance values against expected power dissipation to ensure junction temperatures remain within safe operating limits. Consider the transition frequency and switching speeds for high-speed application suitability compared to slower alternatives.

Part Context

This part belongs to the ZDT series of dual transistors from Diodes Incorporated. The SM-8 package provides a robust solution for medium-power applications. It serves as a discrete alternative to integrated dual-transistor arrays, offering flexibility in circuit design while maintaining a small footprint.

Replacement Considerations

Check pinout compatibility and absolute maximum ratings before substituting. Verify that any replacement part matches the SM-8 package dimensions and thermal characteristics. Ensure the substitute offers equivalent or superior hFE and switching performance for the intended application.

FAQ

What is the maximum power dissipation for the ZDT749TA?

The total power dissipation is 2.25 W if only one die is on, and 2.75 W if both dies are on equally at 25°C ambient temperature.

What is the transition frequency of the ZDT749TA?

The transition frequency (fT) is typically 160 MHz, measured at IC=-100mA, VCE=-5V, and f=100MHz.

What is the collector-emitter saturation voltage at full load?

At IC=-2A and IB=-200mA, the collector-emitter saturation voltage (VCE(sat)) has a maximum value of -0.5 V.