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Diodes Incorporated DDTC142TU-7
- Part No.:
- DDTC142TU-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTC142TU-7.pdf
- Description:
- TRANS PREBIAS NPN 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,490
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Product details
Overview
DDTC142TU-7 from Diodes Incorporated is an NPN pre-biased digital transistor in SOT-323 package, featuring integrated 47 kΩ input resistor (R1) and open-emitter configuration (R2 = OPEN), rated for 100 mA output current, 50 V VCBO, and 5 V VEBO. It functions as a single-stage logic-level switch in low-power interface circuits, commonly used in LED drivers, microcontroller I/O buffering, and level translation in portable consumer electronics.
For engineers reviewing the DDTC142TU-7 datasheet, DDTC142TU-7 pinout, DDTC142TU-7 application, or DDTC142TU-7 equivalent, key selection criteria include its fixed bias network (R1 = 47 kΩ, R2 = OPEN), guaranteed hFE of 100–600 at IC = 1 mA, VCE(sat) ≤ 0.3 V, and compatibility with 3.3 V/5 V logic families in space-constrained PCB layouts.
Technical Context
This device integrates base-emitter biasing resistors directly into the die structure, eliminating external components for basic switching operation. Its R1-only topology (R2 = OPEN) enables direct connection to logic outputs while providing predictable turn-on threshold and saturation behavior under defined IB/IC conditions.
The SOT-323 package supports high-density mounting and thermal performance up to 200 mW PD at TA = 25°C, with junction-to-ambient thermal resistance of 625°C/W on FR4 board. Electrical specs are validated across –55°C to +150°C operating range, meeting industrial-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 50 V - Maximum collector-base voltage before breakdown; sets upper limit for supply rail compatibility in high-side switch configurations. |
| VEBO | 5 V - Emitter-base reverse voltage rating; constrains allowable negative input swing relative to emitter reference. |
| hFE | 100–600 - DC current gain at IC = 1 mA, VCE = 5 V; ensures reliable saturation with minimal drive current in logic-controlled switches. |
| VCE(sat) | ≤ 0.3 V - Collector-emitter saturation voltage at IC = 5 mA, IB = 0.25 mA; minimizes conduction loss and self-heating in power-sensitive applications. |
| PD | 200 mW - Maximum power dissipation on FR4 board; defines safe continuous operating envelope without heatsinking. |
| RθJA | 625 °C/W - Junction-to-ambient thermal resistance; determines temperature rise per watt under standard PCB layout conditions. |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic case (2.0 × 1.25 × 0.95 mm), RoHS-compliant, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for bias network; connected to ground or low-side return path in common-emitter switch topology. |
| 2 (Base) | Input control node | Access point to internal R1 resistor (47 kΩ); accepts TTL/CMOS logic signals directly without external pull-up/down. |
| 3 (Collector) | Output current path | Sinks load current to emitter; configured for low-side switching with VCC applied externally through load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias network | R1 = 47 kΩ, R2 = OPEN - eliminates two external resistors, reducing BOM count and layout area in discrete logic interface stages. |
| Low saturation voltage | VCE(sat) ≤ 0.3 V at IC = 5 mA - enables efficient switching of LEDs or small relays with minimal voltage drop and heat generation. |
| Wide operating temperature | –55°C to +150°C - supports deployment in automotive cabin modules, industrial sensors, and outdoor IoT nodes without derating. |
| Green compound packaging | Halogen- and antimony-free molding compound (Br+Cl < 1500 ppm, Sb < 1000 ppm) - meets global environmental compliance mandates including RoHS 3. |
Applications
| LED Driver Circuit | Microcontroller I/O Buffer |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V GPIO pins of ARM Cortex-M0 microcontrollers. IC Role / Device Role / Timing Role: Low-side current sink switch with built-in base resistor, eliminating need for external current-limiting resistor at base. Use Value: Reduces component count by one resistor per channel and ensures consistent LED brightness across varying supply voltages due to stable hFE and VCE(sat). | Use Scenario: Level-shifting 1.8 V FPGA output to drive 5 V logic inputs in mixed-voltage systems. IC Role / Device Role / Timing Role: Digital translator with fast turn-on (ton < 50 ns typical) and guaranteed saturation at low input current. Use Value: Enables robust signal integrity without timing skew from RC delays introduced by discrete bias networks. |
| Portable Power Management | Industrial Sensor Interface |
Use Scenario: Enabling/disabling 5 V power rails for Bluetooth modules in battery-powered wearables. IC Role / Device Role / Timing Role: Load switch controlled by low-power MCU sleep/wake signals; operates reliably down to 1.8 V input. Use Value: Achieves sub-1 µA leakage (IO(off) ≤ 0.5 µA) during standby, extending battery life in always-on sensor nodes. | Use Scenario: Isolating analog sensor outputs from noisy digital subsystems in factory automation PLCs. IC Role / Device Role / Timing Role: Signal conditioner that decouples ground loops via optocoupler-like functionality using discrete transistor isolation. Use Value: Provides 50 V VCBO margin against transient surges on 24 V industrial buses, improving system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTC142EU-7-F | R1 = 47 kΩ, R2 = 10 kΩ - includes emitter feedback resistor for improved stability and reduced sensitivity to temperature drift. | Preferred in precision current-sensing or linear amplifier biasing where gain consistency matters more than minimal component count. | Select when tighter hFE tolerance or improved thermal stability is required over raw cost reduction. |
| NSV142TUT1G | Same R1/R2 values (47 kΩ / OPEN), but optimized for AEC-Q101 qualification and automotive-grade traceability (PPAP-capable). | Required for under-hood automotive modules where extended temperature cycling and failure rate reporting are mandated. | Choose for automotive production programs needing IATF 16949 manufacturing evidence and AEC-Q101 test reports. |
Compared with DDTC142TU-7, DDTC142EU-7-F adds emitter feedback for bias stability at the cost of one extra internal resistor, while NSV142TUT1G delivers identical electrical specs with full automotive qualification-making it suitable for safety-critical deployments where DDTC142TU-7's industrial rating is insufficient.
Availability
DDTC142TU-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O buffering, portable power management, and industrial sensor interface applications requiring stable component supply and long-term obsolescence mitigation support.
Supply support for DDTC142TU-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The DDTC series belongs to Diodes' pre-biased transistor product line, engineered specifically for reducing component count and layout complexity in digital switching and interface applications across consumer, industrial, and computing markets.
FAQ
Is DDTC142TU-7 still in active production?
No-DDTC142TU-7 is officially obsolete per Diodes Incorporated's DS30401 Rev. 7-4 (June 2021). However, Aetrix Electronics maintains legacy inventory and offers cross-reference support, including verified alternatives like NSV142TUT1G and engineering guidance for redesign migration paths.
What is the function of the "OPEN" R2 terminal in DDTC142TU-7?
The R2 = OPEN designation means no internal resistor connects between base and emitter. This configuration allows direct emitter grounding for standard common-emitter switching, simplifying circuit design versus dual-resistor variants that require external emitter biasing or feedback.
Can DDTC142TU-7 replace a standard 2N3904 transistor in existing designs?
Only with schematic modification: DDTC142TU-7 includes a built-in 47 kΩ base resistor, so replacing a bare 2N3904 requires removing the external base resistor and verifying drive voltage compatibility. Its VEBO = 5 V also limits reverse input swing compared to 2N3904's 6 V rating.
Does DDTC142TU-7 support PWM dimming of LEDs?
Yes-its fT = 200 MHz and fast switching characteristics (ton/toff < 100 ns typical) support PWM frequencies up to 100 kHz without significant duty-cycle distortion, provided layout minimizes parasitic inductance and the load current stays within 100 mA absolute maximum rating.
DDTC142TU-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 470 Ohms
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 250µA, 5mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 200 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
DDTC142TU-7 FAQ
1.How can I place an order for DDTC142TU-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC142TU-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DDTC142TU-7 reliable?
The price and inventory of DDTC142TU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC142TU-7 is usually 5 days.
3.What payment methods are accepted for DDTC142TU-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC142TU-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC142TU-7?
DDTC142TU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC142TU-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DDTC142TU-7?
For technical support, including DDTC142TU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC142TU-7 requirements.
6.How does Aetrix verify that DDTC142TU-7 is sourced from the original manufacturer or authorized distributors?
All DDTC142TU-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DDTC142TU-7 meets industry standards.
7.What is the process for return or replacement of DDTC142TU-7?
All DDTC142TU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC142TU-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DDTC142TU-7 part is unused and in its original packaging.
Return procedure for DDTC142TU-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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