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Diodes Incorporated DDTC143ECA-7
- Part No.:
- DDTC143ECA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTC143ECA-7.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,466
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Product details
Overview
DDTC143ECA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT23 package, featuring integrated bias resistors R1 = R2 = 4.7 kΩ, 100 mA max output current, 50 V VCC, and AEC-Q101 qualification for automotive applications. It functions as a digital switch or level translator in low-power logic interface circuits.
For engineers reviewing the DDTC143ECA-7 datasheet, DDTC143ECA-7 pinout, DDTC143ECA-7 application, or DDTC143ECA-7 equivalent, key selection criteria include input voltage threshold (VIN(on) = 1.9 V typ), saturation voltage (VCE(SAT) ≤ 0.3 V at 20 mA), DC current gain (hFE = 20 min), thermal resistance (RθJA = 625 °C/W), and automotive-grade reliability compliance.
Technical Context
This device integrates two matched 4.7 kΩ bias resistors to configure a single-NPN transistor with base-emitter and base-collector resistor networks, enabling direct TTL/CMOS logic-level drive without external components. Its internal topology supports clean switching between 0 V and 5 V rails with fast turn-on/turn-off characteristics.
The SOT23 package delivers compact surface-mount integration while maintaining 200 mW power dissipation capability and -55°C to +150°C operating temperature range. Its AEC-Q101 qualification confirms suitability for under-hood automotive control modules requiring robust thermal and ESD performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Max | 50 V - Supports rail voltages up to 50 V without breakdown |
| R1 = R2 | 4.7 kΩ ±30% - Enables direct 3.3 V/5 V logic interfacing with defined input impedance |
| IO Max | 100 mA - Drives moderate-current loads such as LEDs or small relays |
| VCE(SAT) | ≤ 0.3 V at IC = 20 mA - Minimizes conduction loss in switching applications |
| hFE | 20 min at VCE = 5 V, IC = 20 mA - Ensures reliable saturation under worst-case gain conditions |
| PD | 200 mW - Limits thermal rise on standard FR4 PCB with minimum pad layout |
| RθJA | 625 °C/W - Defines junction-to-ambient thermal gradient under natural convection |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with 3 terminals, 0.008 g mass, UL 94V-0 rated molding compound, and matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for current sink operation; connects to ground or low-side return path |
| 2 (Base) | Input node with internal R1/R2 network | Accepts logic-level input; internal resistors bias transistor into saturation when driven high |
| 3 (Collector) | Output collector node | Sinks load current from VCC; used for open-collector-style switching |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 = R2 bias network | Eliminates need for two external resistors, reducing BOM count and PCB area |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and lighting |
| Lead-free & halogen-free "Green" construction | Meets RoHS 2/3 and JEDEC J-STD-020 moisture sensitivity Level 1 requirements |
| Epitaxial planar die | Ensures stable hFE and low leakage across temperature and process variation |
Applications
| Automotive Body Control Module | Industrial PLC Input Interface |
|---|---|
Use Scenario: Driving LED status indicators and relay coils in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: NPN digital switch translating microcontroller GPIO outputs to 12 V loads. Use Value: Eliminates discrete base-resistor design effort while meeting AEC-Q101 vibration and thermal cycling requirements. | Use Scenario: Isolating 24 V field sensor inputs from 3.3 V microcontroller I/O pins in factory automation systems. IC Role / Device Role / Timing Role: Logic-level translator and current-limiting interface for dry-contact or PNP sensor signals. Use Value: Provides predictable 4.7 kΩ input impedance and <0.3 V saturation drop for accurate signal detection. |
| Consumer Appliance Power Sequencing | Medical Diagnostic Equipment Signal Conditioning |
Use Scenario: Enabling sequential power-up of subsystems (e.g., display backlight before main processor) in smart home appliances. IC Role / Device Role / Timing Role: Low-power enable switch controlled by system supervisor IC or MCU reset signal. Use Value: Delivers consistent 100 mA drive capability with minimal board space and no external bias components. | Use Scenario: Buffering analog front-end enable signals in portable ultrasound or patient monitor devices. IC Role / Device Role / Timing Role: Safe, low-leakage switch isolating sensitive analog sections during standby mode. Use Value: Maintains <0.5 μA off-state leakage at 50 V VCC, preserving signal integrity and battery life. |
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 |
|---|---|---|---|
| DDTC123ECA-7-F | R1 = R2 = 2.2 kΩ; lower input impedance; higher input current (3.8 mA at 5 V) | Better suited for driving heavier capacitive loads or faster switching due to stronger base drive | Select when VIN(on) must be lower (<1.1 V) or when driving >50 mA loads reliably |
| DDTC114ECA-7-F | R1 = R2 = 10 kΩ; higher input impedance; lower input current (0.88 mA at 5 V) | Optimized for ultra-low-power microcontroller I/O with limited drive strength | Select when minimizing MCU GPIO loading is critical and load current ≤50 mA |
Compared with DDTC123ECA-7-F and DDTC114ECA-7-F, DDTC143ECA-7 strikes a balance: its 4.7 kΩ bias offers moderate input current (1.8 mA at 5 V) and robust 100 mA output drive, making it ideal for general-purpose 5 V logic interfacing where neither extreme low-power nor high-speed switching dominates.
Availability
DDTC143ECA-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and consumer appliance power sequencing requiring stable component supply and AEC-Q101-compliant reliability.
Supply support for DDTC143ECA-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 automotive, industrial, and consumer markets.
The DDTC series belongs to Diodes' pre-biased transistor product line, designed specifically to simplify digital interface design by integrating precision-matched bias resistors into standard SOT23 packages for automotive and industrial control applications.
FAQ
What is the maximum continuous collector current for DDTC143ECA-7?
The absolute maximum collector current is 100 mA, specified under DC conditions with VCE ≤ 50 V and ambient temperature ≤ +25°C. Derating applies above +25°C per the 625 °C/W thermal resistance; at +85°C ambient, usable current drops to ~65 mA to maintain junction temperature below 150°C.
Does DDTC143ECA-7 require external bias resistors?
No. DDTC143ECA-7 integrates two matched 4.7 kΩ resistors (R1 = R2) internally, forming a complete NPN pre-biased configuration. This eliminates the need for external base resistors when used as a digital switch or logic-level translator, reducing component count and PCB footprint.
Is DDTC143ECA-7 qualified for automotive applications?
Yes. DDTC143ECA-7 is AEC-Q101 qualified and PPAP capable. It meets automotive reliability standards for temperature cycling, humidity, mechanical shock, and long-term operational stability, and is marked "AEC-Q101" in the ordering information table of the datasheet.
What is the typical input voltage required to saturate DDTC143ECA-7?
The typical input voltage to achieve saturation (VCE(SAT) ≤ 0.3 V at IC = 20 mA) is 1.9 V, with a guaranteed maximum of 3.0 V under test conditions. At 5 V supply, input current is approximately 1.8 mA, ensuring reliable turn-on across process and temperature variations.
DDTC143ECA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 4.7 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 20 @ 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-23-3
DDTC143ECA-7 FAQ
1.How can I place an order for DDTC143ECA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC143ECA-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 DDTC143ECA-7 reliable?
The price and inventory of DDTC143ECA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC143ECA-7 is usually 5 days.
3.What payment methods are accepted for DDTC143ECA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC143ECA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC143ECA-7?
DDTC143ECA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC143ECA-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 DDTC143ECA-7?
For technical support, including DDTC143ECA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC143ECA-7 requirements.
6.How does Aetrix verify that DDTC143ECA-7 is sourced from the original manufacturer or authorized distributors?
All DDTC143ECA-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 DDTC143ECA-7 meets industry standards.
7.What is the process for return or replacement of DDTC143ECA-7?
All DDTC143ECA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC143ECA-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 DDTC143ECA-7 part is unused and in its original packaging.
Return procedure for DDTC143ECA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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