DDTA144TCA-7-F

Overview

The DDTA144TCA-7-F is a PNP pre-biased small signal surface mount transistor manufactured by Diodes Incorporated. It features an epitaxial planar die construction and includes built-in biasing resistors with nominal values of R1=47 kΩ and R2=470 kΩ. The device is housed in a SOT-23-3 package, distinct from the SOT-323 case listed for the UA series in the provided datasheet. Key electrical ratings include a maximum collector-emitter voltage (VCEO) of -50 V, a continuous collector current (IC) of -100 mA, and a power dissipation (Pd) of 200 mW. The DC current gain (hFE) has a minimum value of 100 at IC=-1mA and VCE=-5V. The transition frequency (fT) is typically 250 MHz. Operating temperatures range from -55°C to +150°C.

Feature Summary

• Integrates two internal biasing resistors (R1≠R2) to simplify circuit design and reduce component count.
• Utilizes epitaxial planar die construction for reliable performance in surface mount applications.
• Provides complementary NPN types within the DDTC series for push-pull configurations.

Applications

• General-purpose switching circuits requiring simplified base drive networks.
• Driver stages for relays, solenoids, or LED loads.
• Logic level translation between microcontrollers and peripheral devices.

Procurement Notes

Verify the package type carefully, as the 'C' suffix indicates SOT-23-3, whereas the provided datasheet primarily details the 'UA' suffix which uses SOT-323. Confirm RoHS compliance and lead-free status with the supplier, noting that green molding compound usage depends on the date code. Ensure the ordering suffix matches the required packaging format, such as tape and reel quantities.

Selection Notes

Select this component when a PNP digital transistor with a 47 kΩ input resistor is required. Compare against the DDTC144 series if an NPN equivalent is needed. Consider the SOT-23-3 footprint constraints versus the SOT-323 dimensions detailed in the reference document. Verify thermal resistance requirements, as the junction-to-ambient rating is specified at 625 °C/W on FR4 PCBs.

Part Context

This part belongs to the DDTA144 series of pre-biased transistors from Diodes Incorporated. It serves as the PNP counterpart to the DDTC144 series. The specific 'TCA' suffix denotes the SOT-23-3 package variant, differentiating it from the SOT-323 packaged 'UA' variants covered extensively in the standard DDTA UA datasheet.

Replacement Considerations

Direct substitutes include other DDTA144 variants with identical resistor ratios but different packages, such as DDTA144VUA-7-F (SOT-323). Cross-reference with generic PNP digital transistors having similar R1/R2 values and VCEO ratings, ensuring pinout compatibility between SOT-23-3 and alternative packages.