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Product Detailed Parameters
- Description：TRANS PREBIAS NPN 200MW SOT323
- Series：*
- Mfr：Diodes Incorporated
- Package：Tape & Reel (TR),Tape & Reel (TR),Cut Tape (CT)
- Resistors Included：-
- Transistor Type：-
- Current - Collector (Ic) (Max)：-
- Voltage - Collector Emitter Breakdown (Max)：-
- Resistor - Base (R1)：-
- Resistor - Emitter Base (R2)：-
- DC Current Gain (hFE) (Min) @ Ic, Vce：-
- Vce Saturation (Max) @ Ib, Ic：-
- Current - Collector Cutoff (Max)：-
- Frequency - Transition：-
- Power - Max：-
- Grade：-
- Qualification：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
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Overview
The DDTD142TU-7 is an NPN pre-biased transistor manufactured by Diodes Incorporated, housed in a surface-mount SOT323 package. It integrates a single biasing resistor (R1) with a nominal value of 0.47 kΩ, while the second resistor position remains open. The device supports a maximum collector-emitter voltage (BVCEO) of 40 V and a continuous collector current of 500 mA. Key electrical characteristics include a DC current transfer ratio (hFE) ranging from 100 to 600 at IC = 5mA, and a gain-bandwidth product (fT) of 200 MHz. Thermal performance specifies a power dissipation of 250 mW and a junction-to-ambient thermal resistance of 500 °C/W.
Feature Summary
- Integrates a built-in base biasing resistor to simplify circuit design and reduce component count.
- Utilizes epitaxial planar die construction for reliable high-reliability performance.
- Complies with RoHS standards and is halogen-free and antimony-free.
- Designed for automated assembly using standard surface-mount packaging.
Applications
- General-purpose switching applications
- Driver circuits for low-power loads
- Logic interface buffering
Procurement Notes
Verify the specific ordering suffix against the manufacturer's official documentation before procurement. The datasheet indicates that the -7-F variant is listed as obsolete; confirm current availability status directly with authorized distributors or the manufacturer. Ensure the selected part matches the required R1 resistance value and package type for your specific application requirements.
Selection Notes
Select this component when a compact NPN solution with integrated biasing is required for space-constrained designs. Verify that the 40V collector-emitter breakdown voltage meets the system's supply requirements. Consider the 250mW power dissipation limit and ensure adequate PCB copper area for thermal management, as the thermal resistance is relatively high compared to larger packages.
Part Context
This component belongs to the DDTD series of NPN pre-biased transistors from Diodes Incorporated. It is part of a family that includes variants with different resistor values (e.g., DDTD122TU) and complementary PNP types (DDTB series). The SOT323 package is commonly used in portable electronics and consumer devices where small form factors are critical.
Replacement Considerations
Check for direct pin-compatible alternatives within the same series, such as DDTD122TU-7 if a 0.22kΩ resistor is acceptable. Cross-reference with other manufacturers' SOT323 NPN pre-biased transistors, ensuring matching BVCEO, hFE, and resistor tolerance specifications.
