DDTA144TKA-7-F

Overview

The DDTA144TKA-7-F is a PNP pre-biased small signal surface mount transistor from Diodes Incorporated, housed in an SC-59 (SOT-23-3) package. It features a built-in base bias resistor (R1) with a nominal value of 47 kΩ. Key electrical ratings include a collector-emitter voltage (VCEO) of -50 V, a continuous collector current (IC) of -100 mA, and power dissipation (Pd) of 200 mW at 25°C ambient temperature. The device exhibits a DC current transfer ratio (hFE) ranging from 100 to 600 at IC = -1mA and VCE = -5V, with a gain-bandwidth product (fT) of 250 MHz. Operating temperatures span from -55°C to +150°C.

Feature Summary

• Integrates a single built-in bias resistor (R1 only) to simplify circuit design by eliminating external input resistors.
• Utilizes epitaxial planar die construction for reliable performance in surface mount applications.
• Provides complementary NPN types within the same series for flexible system configuration.

Applications

• Inverter circuits requiring simplified input biasing networks.
• Switching applications in consumer electronics and portable devices.
• General-purpose digital logic interfacing and level shifting.

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm RoHS compliance and green molding compound status based on date codes. Ensure proper handling procedures are followed due to surface mount packaging requirements. Check datasheet revisions for any updates to mechanical or electrical specifications before finalizing procurement decisions.

Selection Notes

Select this component when a PNP pre-biased transistor with a 47 kΩ base resistor is required. Consider the -50 V voltage rating and -100 mA current limit for load compatibility. Evaluate thermal resistance characteristics if operating near maximum temperature limits. Compare against complementary NPN variants if symmetrical switching pairs are needed.

Part Context

Part of the DDTA144 series of PNP pre-biased transistors. Shares the SC-59 package form factor with other members like DDTA114TKA and DDTA124TKA. Differentiated by its specific 47 kΩ internal resistor value. Designed for high-volume surface mount assembly processes.

Replacement Considerations

Direct substitutes include other DDTA144TKA variants from different manufacturers if pinout and electrical parameters match exactly. Complementary DDTC144TKA can be used if NPN polarity is acceptable. Verify resistor tolerance and hFE ranges before substitution.

FAQ

What is the function of the built-in resistor in the DDTA144TKA?

The built-in resistor (R1) is connected to the base terminal, providing a fixed bias path that simplifies circuit design by removing the need for an external input resistor.

What is the maximum collector-emitter voltage for this device?

The maximum collector-emitter voltage (VCEO) is rated at -50 V.

Does the DDTA144TKA support negative input biasing?

Yes, the thin-film bias resistors provide complete isolation, allowing for negative biasing of the input without affecting the device operation.