DDTC122TU-7-F

Overview

The DDTC122TU-7-F is an obsolete NPN pre-biased surface mount transistor from Diodes Incorporated, housed in a SOT-323 package. It integrates a 0.22 kΩ base resistor (R1) with no collector resistor (R2 open). Maximum ratings include a 50 V supply voltage, 100 mA output current, and 200 mW power dissipation at 25°C. The device operates within a temperature range of -55°C to +150°C. Electrical characteristics specify a DC current transfer ratio (hFE) of 100 to 600 at IC=1mA, a gain-bandwidth product of 200 MHz, and a collector-emitter saturation voltage of 0.3 V max.

Feature Summary

• Integrates built-in biasing resistors for simplified circuit design
• Utilizes epitaxial planar die construction for reliability
• Compliant with RoHS directives and halogen/antimony-free standards

Applications

• General purpose switching applications
• Driver circuits for low-current loads
• Logic level translation interfaces

Procurement Notes

This component is officially marked as obsolete and discontinued by the manufacturer. Verification of availability requires direct contact with Diodes Incorporated or authorized representatives. Standard distribution channels may not stock this part. Engineers should confirm end-of-life status and lead times through official supplier channels before initiating any procurement processes.

Selection Notes

Select this part only if legacy compatibility is required, as it is no longer in production. Verify that the SOT-323 package dimensions and pinout match the existing PCB layout. Ensure the 0.22 kΩ internal base resistor meets the specific drive requirements of the application. Consider alternative active components if long-term supply stability is a priority.

Part Context

The DDTC122TU-7-F belongs to the DDTC series of NPN pre-biased transistors. It shares the same physical package and general electrical profile as complementary PNP types (DDTA series) and other variants like the DDTC142TU. The suffix '-7-F' indicates tape and reel packaging with 3000 units per reel, consistent with other parts in this family.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the datasheet. As the part is discontinued, engineers must identify equivalent pre-biased NPN transistors with matching R1 values (0.22 kΩ), SOT-323 packages, and similar hFE ranges through independent component cross-reference tools.