DDTA143EUA-7

Overview

The DDTA143EUA-7 is a PNP pre-biased small signal surface mount transistor manufactured by Diodes Incorporated. It features built-in biasing resistors where R1 equals R2, with a nominal resistance of 4.7 kOhms each. The device utilizes an epitaxial planar die construction and is housed in a SOT-323 package. Key electrical characteristics include a maximum supply voltage (VCC) 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 -20 at a collector current of -10 mA. The transition frequency (fT) is typically 250 MHz. The operating and storage temperature range spans from -55°C to +150°C.

Feature Summary

• Integrates two equal-value biasing resistors (R1 = R2) directly on the chip 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 or differential configurations.

Applications

• General-purpose switching circuits requiring integrated base drive resistors.
• Driver stages for relays, solenoids, or small loads in consumer electronics.
• Logic level translation and interface buffering between microcontrollers and peripheral devices.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging quantity and tape-and-reel specifications. Confirm that the requested variant matches the required RoHS compliance and green molding compound status if applicable for environmental regulations. Cross-reference the date code key to determine manufacturing timing relative to material composition changes.

Selection Notes

Select this component when a single PNP transistor with matched internal biasing resistors is required for space-constrained designs. Ensure the 4.7 kOhm resistor value aligns with the target input current and logic voltage levels. Consider the SOT-323 package dimensions and thermal resistance characteristics for adequate heat dissipation under maximum load conditions.

Part Context

This part belongs to the DDTA1xxEUA series of pre-biased transistors from Diodes Incorporated. The '143' designation specifically indicates the 4.7 kOhm resistor value configuration. It is part of a broader family including variants with different resistance values such as 2.2 kOhm, 10 kOhm, and 100 kOhm, all sharing the same SOT-323 footprint and electrical topology.

Replacement Considerations

Direct functional substitutes may include other PNP pre-biased transistors with similar 4.7 kOhm internal resistances and SOT-323 packaging. Verify pinout compatibility and electrical ratings before substitution. Note that while other manufacturers offer similar devices, exact parameter matching requires datasheet comparison.