DDTA143FKA-7-F

Overview

The DDTA143FKA-7-F is a PNP pre-biased small signal surface mount transistor manufactured by Diodes Incorporated. It features an epitaxial planar die construction and integrates built-in biasing resistors with nominal values of R1 = 4.7 kΩ and R2 = 22 kΩ. The device is housed in an SC-59 package, which corresponds to the SOT-363 footprint. Key electrical ratings include a maximum collector-emitter voltage (VCEO) of -50 V, a continuous collector current of -100 mA, and a power dissipation capability of 200 mW at 25°C ambient temperature. The minimum DC current gain (hFE) is specified as -68 under standard test conditions.

Feature Summary

• Integrates two distinct biasing resistors (R1 ≠ R2) within a single compact surface-mount package to simplify circuit design.
• Utilizes epitaxial planar die construction for reliable performance in small signal applications.
• Offers complementary NPN types available within the same series for push-pull configurations.

Applications

• General-purpose switching circuits requiring integrated base drive resistance.
• Driver stages for logic interfaces where simplified biasing networks are preferred.
• Small signal amplification tasks within consumer electronics and industrial control systems.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging configuration. Confirm that the SC-59 package dimensions align with the target PCB land pattern. Check for RoHS compliance status if environmental regulations apply to the final assembly. Ensure storage conditions adhere to moisture sensitivity level requirements prior to soldering.

Selection Notes

Select this component when a PNP transistor with unequal internal biasing resistors is required. The 4.7 kΩ input resistor and 22 kΩ emitter-base resistor combination suits applications needing specific input impedance characteristics. Verify that the -50 V voltage rating and -100 mA current capacity meet the system's operational limits. Consider the SC-59 package size constraints during layout planning.

Part Context

This part belongs to the DDTA143 series of pre-biased transistors from Diodes Incorporated. It shares the same core transistor structure as other variants in the family but differs in its internal resistor network configuration. The 'KA' suffix denotes the SC-59 package type, distinguishing it from other package options like SOT-23 or SOT-523 found in related product lines.

Replacement Considerations

Direct substitutes must match the PNP polarity, SC-59 package, and the specific 4.7 kΩ/22 kΩ resistor ratio. Verify equivalent electrical parameters such as VCEO, IC, and hFE. Cross-reference with other manufacturers offering pre-biased transistors in the SC-59 form factor if availability is constrained.