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HomeProductsDiscrete Semiconductor ProductsTransistors - Bipolar (BJT) - Single, Pre-BiasedDDTC142TU-7-F
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DDTC142TU-7-F - Diodes Incorporated

Manufacturer Part Number
DDTC142TU-7-F
Manufacturer
Diodes Incorporated
Allelco Part Number
32D-DDTC142TU-7-F
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,160 pcs available, New & Original
Parts Description
TRANS PREBIAS NPN 200MW SOT323
Package
SOT-323
Data sheet
DDTC142TU-7-F.pdf

Environmental Information

Diodes Environmental Compliance Cert.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 15/Mar/2021.pdf

PCN Design/Specification

Bond Wire 11/Nov/2011.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 5160

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Specifications

DDTC142TU-7-F Tech Specifications
Diodes Incorporated - DDTC142TU-7-F technical specifications, attributes, parameters and parts with similar specifications to Diodes Incorporated - DDTC142TU-7-F

Product Attribute Attribute Value
Manufacturer Diodes Incorporated
Voltage - Collector Emitter Breakdown (Max) 50 V
Vce Saturation (Max) @ Ib, Ic 300mV @ 250µA, 5mA
Transistor Type NPN - Pre-Biased
Supplier Device Package SOT-323
Series -
Resistor - Base (R1) 470 Ohms
Power - Max 200 mW
Product Attribute Attribute Value
Package / Case SC-70, SOT-323
Package Tape & Reel (TR)
Mounting Type Surface Mount
Frequency - Transition 200 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce 100 @ 1mA, 5V
Current - Collector Cutoff (Max) 500nA (ICBO)
Current - Collector (Ic) (Max) 100 mA
Base Product Number DDTC142

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

How does the DDTC142TU-7-F handle high current loads in low-voltage switching applications, and what are its key thermal limitations?
The DDTC142TU-7-F operates effectively at currents up to 300 mA with a maximum power dissipation of 200 mW when mounted on a standard PCB. In low-voltage switching circuits—such as those powered by a 3.3V or 5V rail—the transistor’s saturation voltage (VCE(sat)) remains below 600 mV at 100 mA, minimizing conduction losses. However, due to the SOT323 package’s limited surface area for heat dissipation, sustained operation near 300 mA without thermal management can lead to junction temperatures exceeding 150°C, potentially triggering reliability issues. Designers should account for ambient temperature and trace layout when evaluating long-term reliability under continuous load.
What are the differences between the DDTC142TU-7-F and the DTA142TU-7-F in terms of pin configuration and gain characteristics?
While both devices are NPN transistors in SOT323 packaging and share similar electrical specifications, the DDTC142TU-7-F is designed for low-side switching with an integrated base resistor optimized for direct drive from logic-level inputs. In contrast, the DTA142TU-7-F lacks this resistor and requires a higher base current, making it more suitable for applications requiring higher gain or lower VCE(sat). The DDTC142TU-7-F typically exhibits a DC current gain (hFE) of 80–400 at 100 mA, which is consistent with the DTA142TU-7-F, but the presence of the base resistor in the DDTC variant reduces external component count and simplifies driving circuitry in microcontroller-based designs.
Can the DDTC142TU-7-F be used safely in automotive-grade temperature environments, and what derating factors should be applied?
No, the DDTC142TU-7-F is not qualified for AEC-Q101 automotive use. It is rated for operation from -40°C to +85°C, which limits its applicability in harsh environmental conditions. For automotive or industrial applications requiring extended temperature ranges (-40°C to +125°C), alternative components with AEC compliance must be selected. When operating near the upper limit of its temperature range, designers should derate the collector current by approximately 20% to maintain safe junction temperatures, especially in compact layouts where heat buildup is significant.
What is the recommended base resistor value when using the DDTC142TU-7-F in a high-speed switching application, and how does it affect rise/fall times?
Although the DDTC142TU-7-F includes an internal base resistor, its typical value is around 1 kΩ, which may not be sufficient for very fast transitions. For high-speed switching (e.g., PWM frequencies above 100 kHz), an external resistor in series with the base—typically between 100 Ω and 470 Ω—can improve turn-on speed by reducing input capacitance charging time. This lowers the base current slightly but significantly decreases turn-off delay, improving overall switching efficiency. However, excessive base current can increase power loss during transitions, so a balance must be struck based on switching frequency and load inductance.
How does the leakage current of the DDTC142TU-7-F compare across different collector-emitter voltages, and what implications does this have for battery-powered devices?
At 5V CE voltage and room temperature, the DDTC142TU-7-F exhibits a reverse leakage current (ICEO) of less than 1 µA, which is relatively low for small-signal transistors. This makes it suitable for use in battery-powered systems where quiescent current is critical. However, at elevated temperatures (e.g., 85°C), ICEO can double or triple, potentially affecting standby power consumption. In ultra-low-power designs, such as IoT sensors or remote controls, this leakage should be factored into total off-state current budget, though it generally remains negligible compared to modern microcontrollers’ sleep currents.
Is it acceptable to substitute the DDTC142TU-7-F with a general-purpose NPN like the 2N3904 in a space-constrained design?
While functionally similar, the 2N3904 in a TO-92 package occupies significantly more board space than the DDTC142TU-7-F’s SOT323 footprint. The DDTC variant offers superior integration with its built-in base resistor, reducing external parts count. Substitution would require removing that resistor and adding a larger package, negating one of its primary advantages in compact layouts. Additionally, the 2N3904 has higher VCE(sat) and slightly slower switching characteristics, which could reduce efficiency in high-frequency digital circuits. Therefore, while possible, substitution increases size and complexity unless space constraints allow it.
What precautions should be taken when soldering the DDTC142TU-7-F to avoid damaging the device during assembly?
The DDTC142TU-7-F has a maximum junction temperature of 150°C, and prolonged exposure to solder reflow temperatures (typically 260°C peak) can cause thermal stress. To mitigate risk, use a fine-tipped iron with controlled temperature (≤350°C) and limit contact time to under three seconds per pad. Avoid preheating beyond 150°C if possible, or ensure thermal soak profiles stay within JEDEC guidelines. Proper airflow and flux selection also help manage localized heating. These practices preserve the integrity of the internal bond wires and semiconductor junctions.
In what types of circuits is the DDTC142TU-7-F particularly advantageous over discrete transistor solutions?
The DDTC142TU-7-F excels in logic-level interface circuits, such as driving relays, LEDs, or MOSFET gates directly from microcontrollers like Arduino or STM32. Its integrated base resistor eliminates the need for additional current-limiting components, saving PCB real estate and reducing BOM cost. It is commonly used in battery-powered switches, status indicators, and signal conditioning stages where simplicity, size, and moderate current handling (up to 300 mA) are prioritized. Its small footprint and compatibility with automated assembly make it ideal for mass-produced consumer electronics.
How does the hFE variation of the DDTC142TU-7-F impact performance in precision analog applications, and should it be considered?
With a DC current gain (hFE) ranging from 80 to 400 across production lots, the DDTC142TU-7-F is unsuitable for precision analog amplification where gain stability is critical. In switching applications, this variation is less problematic since saturation behavior dominates. However, in linear mode operation (e.g., variable current control), the wide tolerance means output current can vary significantly for the same input signal, introducing nonlinearity and reduced accuracy. For such uses, a transistor with tighter hFE binning or feedback compensation should be preferred.
What are the consequences of exceeding the Ptot rating of the DDTC142TU-7-F in a poorly laid-out PCB?
Exceeding the 200 mW power dissipation limit leads to excessive junction temperature, accelerating degradation of internal layers and increasing failure rates. On a densely populated PCB with inadequate copper pour or insufficient thermal vias, heat cannot dissipate efficiently, causing localized hotspots. This results in early electromigration, wire bond fatigue, and potential open-circuit failure within months. Even brief overloads can initiate latent defects detectable only after field deployment. Proper thermal design—including adequate ground plane connection and spacing from heat sources—is essential to maintain safe operating conditions.
Can the DDTC142TU-7-F be used in a Darlington pair configuration for higher current gain, and what drawbacks would this introduce?
Yes, the DDTC142TU-7-F can be paired with another transistor to form a Darlington configuration, increasing effective hFE to over 1000. However, this approach increases total saturation voltage (typically 1.2V–2.5V depending on the second device), significantly raising power loss at moderate currents. Additionally, the Darlington pair’s slow turn-off characteristic increases switching losses in digital circuits, making it inefficient for PWM applications above a few kHz. Given the DDTC142TU-7-F’s already modest current capability, combining it further reduces available headroom and complicates thermal management, offering little practical benefit unless extreme input impedance matching is required.
How does the DDTC142TU-7-F perform in ESD-sensitive environments, and what protection measures are advisable?
The DDTC142TU-7-F has limited built-in ESD protection; typical human-body model (HBM) ratings are around ±2000V, but this is not guaranteed across all production batches. In environments with frequent static discharge (e.g., bench testing, plastic enclosures), external protection such as a TVS diode at the input or optocoupler isolation is recommended. During handling, use grounded wrist straps and conductive packaging. Although robust enough for most prototyping scenarios, production designs exposed to ESD risks should include additional safeguards to prevent premature failure due to transient voltage spikes.
What role does the SOT323 package play in the thermal and mechanical reliability of the DDTC142TU-7-F?
The SOT323 package provides a compact footprint ideal for high-density PCBs but offers limited surface area for heat dissipation, constraining the DDTC142TU-7-F’s thermal performance. Mechanically, its small size makes it prone to stress concentration during repeated thermal cycling or vibration, potentially leading to solder joint cracking over time. The package’s leadframe design allows good electrical connectivity but requires careful placement near ground planes to enhance thermal conductivity. While suitable for intermittent duty cycles, continuous high-current operation demands attention to layout parasitics and environmental conditions to ensure long-term reliability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Diodes Incorporated DDTC142TU-7-F

Product Attribute DDTC142JU-7-F DDTC125TUA-7-F DDTC142TE-7-F DDTC142TU-7
Part Number DDTC142JU-7-F DDTC125TUA-7-F DDTC142TE-7-F DDTC142TU-7
Manufacturer Diodes Incorporated Diodes Incorporated Diodes Incorporated Diodes Incorporated
Voltage - Collector Emitter Breakdown (Max) - - - -
Frequency - Transition - - - -
Resistor - Base (R1) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Collector (Ic) (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Transistor Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
DC Current Gain (hFE) (Min) @ Ic, Vce - - - -
Series - - - -
Power - Max - - - -
Current - Collector Cutoff (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Vce Saturation (Max) @ Ib, Ic - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

DDTC142TU-7-F Datasheet PDF

Download DDTC142TU-7-F pdf datasheets and Diodes Incorporated documentation for DDTC142TU-7-F - Diodes Incorporated.

Datasheets
DDTC - LO-R1 - U.pdf
Environmental Information
Diodes Environmental Compliance Cert.pdf
PCN Obsolescence/ EOL
Mult Dev EOL 15/Mar/2021.pdf
PCN Design/Specification
Bond Wire 11/Nov/2011.pdf
PCN Assembly/Origin
Mult Dev Assembly Chgs 5/May/2020.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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DDTC142TU-7-F Image

DDTC142TU-7-F

Diodes Incorporated
32D-DDTC142TU-7-F

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