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Diodes Incorporated DDTC143XUA-7
- Part No.:
- DDTC143XUA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTC143XUA-7.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,360
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Product details
Overview
DDTC143XUA-7 from Diodes Incorporated is a 50V NPN pre-biased transistor in SOT323 package, featuring integrated 4.7kΩ and 10kΩ bias resistors (R1/R2), 100mA max output current, 200mW power dissipation, and VIN(on) = 2.5V at IOUT = 20mA. It serves as a compact, surface-mount logic-level switch in low-power digital interface circuits.
For engineers reviewing the DDTC143XUA-7 datasheet, DDTC143XUA-7 pinout, DDTC143XUA-7 application, or DDTC143XUA-7 equivalent, key selection criteria include input voltage threshold (2.5V), guaranteed DC current gain (GL = 30), R1/R2 tolerance (±30% / ±20%), and SOT323 thermal resistance (625°C/W) for board-level thermal design.
Technical Context
This device integrates an NPN transistor with two discrete on-chip resistors-R1 (4.7kΩ) connected between base and input, R2 (10kΩ) between base and emitter-to enable single-pin logic-level drive without external bias components. It operates with VCC up to 50V and supports switching at frequencies up to 250MHz (fT).
The SOT323 package delivers 200mW power handling under standard FR4 mounting, with VOUT(on) ≤ 0.3V at IOUT = 20mA and IOUT(off) ≤ 0.5μA at VCC = 50V, ensuring low-loss saturation and high off-state blocking in signal routing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Max | 50V - Supports rail voltages up to 50V in industrial and automotive supply domains |
| R1 / R2 | 4.7kΩ / 10kΩ - Fixed internal bias network eliminates need for external resistors |
| IOUT Max | 100mA - Sufficient for driving LEDs, small relays, or logic inputs directly |
| VIN(on) | 2.5V @ IOUT = 20mA - Compatible with 3.3V CMOS/TTL logic without level shifting |
| GL | 30 min @ VCE = 5V, IOUT = 10mA - Ensures stable current amplification in saturated switching |
| fT | 250MHz - Enables use in medium-speed digital switching and pulse applications |
| PD | 200mW - Requires minimal PCB copper area for thermal management on standard FR4 |
Pinout & Package
Package: SOT323 - Ultra-small surface-mount plastic package (2.15 × 2.10 × 0.95 mm), moisture sensitivity level 1, matte tin-plated leads, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitting terminal of NPN transistor | Connected to ground or low-side return path; forms common reference for bias network |
| 2 (Base) | Control node for transistor conduction | Internally tied to R1 and R2; no external access - driven only via Pin 3 |
| 3 (Collector) | Current-sinking output terminal | Switches load to VCC; handles up to 100mA with VCE(sat) ≤ 0.3V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1/R2 bias network | Eliminates 2 external resistors, reducing BOM count and layout area in space-constrained designs |
| SOT323 footprint | Enables automated placement and reflow; compatible with 0.65mm pitch PCB assembly processes |
| VIN(on) = 2.5V | Guarantees turn-on with standard 3.3V logic outputs without pull-up or level translation |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and automotive green standards; suitable for AEC-Q101 qualified systems |
| 625°C/W RθJA | Allows thermal design using standard FR4 pads without heatsinks or thermal vias in low-duty-cycle operation |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving indicator LEDs from 3.3V MCU pins with current limiting handled internally. IC Role / Device Role: Single-transistor current sink replacing discrete BJT + resistor combinations. Use Value: Reduces component count by 2 per channel while maintaining 20mA LED current with <0.3V dropout. | Use Scenario: Extending limited GPIO count to control multiple peripheral enable lines. IC Role / Device Role: Logic-level buffer and level translator for 3.3V-to-5V/12V signal interfacing. Use Value: Enables direct connection to 50V rails without external protection diodes or voltage dividers. |
| Low-Power Sensor Interface | Automotive Body Control Module |
Use Scenario: Enabling/disabling analog sensor power rails in battery-powered IoT nodes. IC Role / Device Role: Low-quiescent-current active-high switch for sensor VDD control. Use Value: Achieves <0.5μA off-state leakage at 50V, extending battery life in sleep modes. | Use Scenario: Controlling interior lighting, mirror heaters, or door lock actuators in 12V/24V systems. IC Role / Device Role: AEC-Q101-compatible load switch for non-safety-critical body electronics. Use Value: Delivers 100mA drive capability with built-in biasing, simplifying qualification for automotive PPAP. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pre-biased NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSV143XUAT2G | R1/R2 values match (4.7kΩ/10kΩ); fT = 200MHz vs 250MHz; same SOT-323 package | Qualified to AEC-Q101 Grade 1 (−40°C to +125°C); tighter R1 tolerance (±20%) | Select for automotive production requiring full AEC-Q101 certification and extended temperature validation. |
| EMH143X | Same R1/R2; higher IOUT(max) = 150mA; PD = 300mW; larger SOT-363 package | Offers higher power margin and dual-channel option; not pin-compatible due to 6-pin layout | Choose when thermal headroom or multi-channel integration is required, accepting larger footprint. |
Compared with NSV143XUAT2G and EMH143X, DDTC143XUA-7 provides optimal balance of 3.3V logic compatibility, ultra-compact size, and cost efficiency for consumer and industrial control applications where full AEC-Q101 or dual-channel functionality is not mandated.
Availability
DDTC143XUA-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and low-power sensor interface applications requiring stable component supply and consistent SOT323 sourcing.
Supply support for DDTC143XUA-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, specializing in high-reliability, energy-efficient components for industrial, automotive, and computing markets.
This part belongs to the DDTC (R1≠R2 Series) UA family of pre-biased transistors, designed specifically to reduce component count and improve layout efficiency in logic-level switching applications across consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous collector current for DDTC143XUA-7?
The absolute maximum continuous collector current is 100mA, verified per the DS30322 datasheet Absolute Maximum Ratings table. This rating applies at Tamb = +25°C with proper PCB thermal relief; derating is required above 25°C ambient per the published derating curve (200mW total power limit).
Does DDTC143XUA-7 require external bias resistors?
No - it integrates both R1 (4.7kΩ) and R2 (10kΩ) internally, eliminating the need for external base bias components. The device is configured as a single-input switch: Pin 3 is the input, Pin 1 is emitter (ground), and Pin 3 sinks current through Pin 2 (collector) to load.
Is DDTC143XUA-7 suitable for automotive applications?
It is designed for automotive-grade manufacturing (IATF 16949 facilities) and supports PPAP documentation, but formal AEC-Q101 qualification requires explicit part-number validation. Customers targeting automotive use must contact Diodes Incorporated to confirm qualification status for this specific orderable number.
What is the typical input current at 3.3V supply?
At VIN = 3.3V, the typical input current is 1.8mA, as specified in the Electrical Characteristics table under "Input Current" for DDTC143XUA. This value ensures reliable turn-on while minimizing MCU GPIO loading in 3.3V systems.
DDTC143XUA-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):
- 4.7 kOhms
- Resistor - Emitter Base (R2):
- 10 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 30 @ 10mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 500µA, 10mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 250 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
DDTC143XUA-7 FAQ
1.How can I place an order for DDTC143XUA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC143XUA-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 DDTC143XUA-7 reliable?
The price and inventory of DDTC143XUA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC143XUA-7 is usually 5 days.
3.What payment methods are accepted for DDTC143XUA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC143XUA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC143XUA-7?
DDTC143XUA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC143XUA-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 DDTC143XUA-7?
For technical support, including DDTC143XUA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC143XUA-7 requirements.
6.How does Aetrix verify that DDTC143XUA-7 is sourced from the original manufacturer or authorized distributors?
All DDTC143XUA-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 DDTC143XUA-7 meets industry standards.
7.What is the process for return or replacement of DDTC143XUA-7?
All DDTC143XUA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC143XUA-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 DDTC143XUA-7 part is unused and in its original packaging.
Return procedure for DDTC143XUA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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