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Diodes Incorporated DDTC144EUAQ-7-F
- Part No.:
- DDTC144EUAQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTC144EUAQ-7-F.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
DDTC144EUAQ-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT323 package with integrated bias resistors R1 = R2 = 47 kΩ, DC current gain (hFE) of 68 at IC = 5 mA and VCE = 5 V, VCEO = 50 V, and IO = 100 mA max output current - used for level-shifting and digital switching in automotive control modules.
For engineers reviewing the DDTC144EUAQ-7-F datasheet, DDTC144EUAQ-7-F pinout, DDTC144EUAQ-7-F application, or DDTC144EUAQ-7-F equivalent, key selection criteria include input voltage thresholds (VIN(OFF) = 0.5 V min, VIN(ON) = 1.4–3 V), saturation voltage (VCE(SAT) ≤ 0.3 V at IC/IB = 10), AEC-Q101 qualification, and SOT323 thermal resistance (RθJA = 625 °C/W).
Technical Context
This device integrates two matched 47 kΩ bias resistors (R1 = R2) to configure a single-NPN inverter with fixed base biasing, eliminating external resistor placement. It operates as a digital switch with guaranteed turn-on/turn-off thresholds across -55°C to +150°C ambient range.
Its 50 V VCEO, 100 mA IO rating, and 200 mW power dissipation support robust operation in 12 V automotive subsystems. The 250 MHz fT enables stable performance up to medium-frequency digital edge rates without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - supports direct interface with 12 V/24 V automotive supply rails without external clamping |
| IO (max) | 100 mA - drives moderate-load logic inputs or small relays without external amplification |
| R1 = R2 | 47 kΩ ±30% - provides fixed, temperature-stable base bias for predictable digital switching behavior |
| hFE | 68 (min) at IC = 5 mA, VCE = 5 V - ensures sufficient current gain for reliable saturation under worst-case conditions |
| VCE(SAT) | ≤ 0.3 V at IC/IB = 10 - minimizes conduction loss and self-heating in high-duty-cycle switching |
| PD | 200 mW on FR-4 PCB - defines maximum continuous power handling with standard layout |
| RθJA | 625 °C/W - determines junction temperature rise under static load; requires thermal-aware board layout |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), moisture sensitivity level 1, matte tin-plated leads, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for input/output current flow; connected to GND or low-side return path |
| 2 (Base) | Input node (via R1/R2 divider) | Accepts TTL/CMOS-compatible logic input; internal R1/R2 network sets bias point |
| 3 (Collector) | Output node | Sinks load current when active; open-collector compatible with pull-up configurations |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and lighting modules |
| Integrated R1 = R2 = 47 kΩ | Reduces BOM count by one resistor pair and eliminates matching tolerance errors in discrete bias networks |
| VIN(OFF) ≤ 1.1 V (typ) | Ensures clean logic-low rejection in noisy 12 V systems with wide ground offsets |
| VIN(ON) ≥ 1.4 V (min) | Guarantees reliable turn-on with standard 3.3 V or 5 V microcontroller GPIO outputs |
| Halogen- and antimony-free "Green" construction | Meets automotive environmental compliance (Br+Cl < 1500 ppm, Sb < 1000 ppm) without performance trade-offs |
Applications
| Automotive Door Module Switch Interface | Industrial PLC Digital Input Stage |
|---|---|
Use Scenario: Detecting mechanical switch closures (e.g., door ajar, trunk latch) in 12 V vehicle architectures with long harness runs. IC Role / Device Role / Timing Role: Level-shifting and noise-immune digital input buffer between switch and MCU GPIO. Use Value: Built-in 47 kΩ bias resistors reject EMI-induced false triggers while maintaining fast edge response (<100 ns propagation delay implied by fT = 250 MHz). |
Use Scenario: Converting 24 V industrial field signals into 3.3 V/5 V logic levels for programmable logic controller (PLC) input cards. IC Role / Device Role / Timing Role: Isolated digital input translator with galvanically referenced common-mode rejection. Use Value: 50 V VCEO withstands transients per IEC 61000-4-4; 100 mA IO supports parallel termination without external driver. |
| LED Driver for Dashboard Backlight | USB Port Power Control Switch |
Use Scenario: Driving multiplexed LED segments in automotive instrument clusters where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Low-side constant-current switch enabling PWM dimming at up to 1 kHz. Use Value: VCE(SAT) ≤ 0.3 V minimizes power loss (≤30 mW at 100 mA), reducing local heating in sealed dash enclosures. |
Use Scenario: Enabling/disabling VBUS power to USB peripherals in embedded host devices with strict inrush control. IC Role / Device Role / Timing Role: Controlled load switch with defined turn-on threshold and soft-start behavior via R1/R2 network. Use Value: Input voltage hysteresis (VIN(OFF) = 0.5 V, VIN(ON) = 1.4–3 V) prevents chatter during hot-plug transitions. |
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 |
|---|---|---|---|
| DDTC144EUA-7-F | No AEC-Q101 qualification; identical electrical specs and SOT323 package | Not approved for automotive production; suitable for industrial or consumer prototypes | Select when AEC-Q101 is not required and cost optimization is prioritized |
| NSV144EUAQ-7F | Same R1=R2=47 kΩ, but higher hFE (min 80), lower VCE(SAT) (0.15 V typ), and tighter R1 tolerance (±20%) | Better suited for low-voltage, high-reliability automotive sensors where margin is critical | Choose when enhanced gain stability and reduced saturation loss justify premium pricing |
Compared with DDTC144EUA-7-F, the Q-grade offers automotive qualification and traceability; compared with NSV144EUAQ-7F, it trades minor hFE and VCE(SAT) margin for broader availability and established qualification history in Tier-1 modules.
Availability
DDTC144EUAQ-7-F is available at Aetrix Electronics and suitable for automotive body control units, industrial programmable logic controllers, and USB power management systems requiring stable component supply with full AEC-Q101 documentation and PPAP support.
Supply support for DDTC144EUAQ-7-F 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 centers across Asia and manufacturing in Taiwan and China.
This part belongs to the DDTC R1=R2 series of pre-biased transistors - designed specifically for automotive and industrial digital interface simplification, reducing external component count while maintaining AEC-Q101 reliability.
FAQ
What is the difference between DDTC144EUAQ-7-F and DDTC144EUA-7-F?
The 'Q' suffix denotes AEC-Q101 qualification and automotive-specific PPAP capability. Electrically and thermally, both share identical specifications, SOT323 packaging, and 47 kΩ bias resistors. Only the Q-grade undergoes extended stress testing (HTOL, TC, UHAST) and receives automotive-grade lot traceability and documentation.
Can DDTC144EUAQ-7-F replace a discrete NPN transistor plus two resistors?
Yes - it replaces a standard NPN transistor (e.g., MMBT3904) plus two 47 kΩ base bias resistors. Its internal R1=R2 configuration matches typical voltage-divider biasing for digital switching, reducing PCB area by ~1.5 mm² and eliminating resistor matching drift over temperature.
What is the maximum operating frequency for switching applications?
The device has a gain-bandwidth product (fT) of 250 MHz, but practical digital switching is limited by package parasitics and layout. For clean 0–1 V logic transitions, it reliably supports ≤1 MHz square-wave operation with <100 ns rise/fall times when driven with ≤50 Ω source impedance and loaded with ≤100 pF.
Is this part suitable for linear amplifier use?
No - it is optimized for saturated switching, not linear operation. The integrated bias network fixes the base voltage divider ratio, preventing adjustable Q-point setting. Small-signal parameters like hfe variation and fT are specified only for switching conditions (IC = 5 mA, VCE = 5 V); no linearity, THD, or noise data is provided in the datasheet.
DDTC144EUAQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 47 kOhms
- Resistor - Emitter Base (R2):
- 47 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 80 @ 5mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 500µA, 10mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 250 MHz
- Power - Max:
- 200 mW
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
DDTC144EUAQ-7-F FAQ
1.How can I place an order for DDTC144EUAQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC144EUAQ-7-F 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 DDTC144EUAQ-7-F reliable?
The price and inventory of DDTC144EUAQ-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC144EUAQ-7-F is usually 5 days.
3.What payment methods are accepted for DDTC144EUAQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC144EUAQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC144EUAQ-7-F?
DDTC144EUAQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC144EUAQ-7-F 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 DDTC144EUAQ-7-F?
For technical support, including DDTC144EUAQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC144EUAQ-7-F requirements.
6.How does Aetrix verify that DDTC144EUAQ-7-F is sourced from the original manufacturer or authorized distributors?
All DDTC144EUAQ-7-F 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 DDTC144EUAQ-7-F meets industry standards.
7.What is the process for return or replacement of DDTC144EUAQ-7-F?
All DDTC144EUAQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC144EUAQ-7-F, 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 DDTC144EUAQ-7-F part is unused and in its original packaging.
Return procedure for DDTC144EUAQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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