DDTA124XKA-7-F

Overview

The DDTA124XKA-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 = 22 kΩ and R2 = 47 kΩ. The device is housed in an SC-59 (SOT-23) package and supports a maximum supply voltage of -50 V and a continuous collector current of -100 mA. Power dissipation is rated at 200 mW, with an operating temperature range from -55°C to +150°C. It meets RoHS compliance standards.

Feature Summary

• Integrates two distinct biasing resistors (R1 ≠ R2) to simplify circuit design and reduce component count.
• Utilizes epitaxial planar die construction for reliable performance in surface mount applications.
• Manufactured using lead-free plating and compliant green molding compounds.

Applications

• General-purpose switching circuits requiring integrated base biasing.
• Driver stages for logic interfaces or relay control.
• High-frequency signal processing utilizing the 250 MHz gain-bandwidth product.

Procurement Notes

Verify the specific ordering suffix '-7-F' against official manufacturer documentation to confirm tape and reel packaging quantities. Ensure that the 'Green' status aligns with manufacturing date codes post-2006 if halogen-free requirements are critical. Cross-reference the SC-59 footprint dimensions with PCB layout guidelines provided by the manufacturer.

Selection Notes

Select this component when a PNP configuration with unequal biasing resistors is required. The 22 kΩ input resistor and 47 kΩ emitter resistor provide specific drive characteristics suitable for standard logic levels. Consider the SC-59 package size constraints and the 200 mW thermal dissipation limit during board layout planning.

Part Context

This part belongs to the DDTA series of pre-biased transistors where the internal resistors are not equal. It serves as the PNP counterpart to the DDTC series NPN devices. The KA suffix specifically denotes the SC-59 surface mount package format used across this product family.

Replacement Considerations

Direct substitutes within the same series include DDTA124YKA-7-F and DDTA124ZKA-7-F, which share the SC-59 package but feature different resistor ratios. Verify electrical parameters such as DC current gain and saturation voltages before substituting with other manufacturers' equivalents.