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Diodes Incorporated DDTC144ECAQ-7-F
- Part No.:
- DDTC144ECAQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTC144ECAQ-7-F.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,371
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Product details
Overview
DDTC144ECAQ-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT23 package with integrated bias resistors R1 = R2 = 47 kΩ, 30 mA maximum output current, 0.3 V typical VCE(sat) at IC = 2 mA, and AEC-Q101 qualified for automotive applications including LED load switching and logic-level interface circuits.
For engineers reviewing the DDTC144ECAQ-7-F datasheet, DDTC144ECAQ-7-F pinout, DDTC144ECAQ-7-F application, or DDTC144ECAQ-7-F equivalent, key selection criteria include input resistor tolerance (±30%), DC current gain (GL = 68 typ), VI(OFF)/VI(ON) thresholds, thermal resistance (625 °C/W), and automotive qualification status.
Technical Context
This device integrates two matched 47 kΩ bias resistors (R1 = R2) to configure a single-NPN transistor as a digital switch with defined turn-on/turn-off voltage thresholds. It operates as a current-controlled inverter with fixed base biasing, eliminating external resistor networks in low-power digital interface and load driver designs.
Designed for 5 V logic systems, it delivers 2 mA output current with 0.3 V saturation voltage and supports ambient temperatures from –55 °C to +150 °C. Its 200 mW power dissipation and 625 °C/W junction-to-ambient thermal resistance are specified under FR4 PCB mounting with minimum pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R1, R2 Nominal Value | 47 kΩ - sets input threshold and base current for predictable digital switching behavior |
| VI(OFF) | 0.5–1.1 V - ensures reliable cutoff below standard TTL/CMOS logic low levels |
| VI(ON) | 1.9–3.0 V - guarantees full turn-on across process and temperature for 5 V logic drive |
| VCE(sat) | 0.1–0.3 V at IC/IB = 2 mA/0.5 mA - minimizes conduction loss in load-switching applications |
| GL (DC Current Gain) | 68 typ at VO = 5 V, IC = 5 mA - provides stable current amplification without external gain-setting components |
| PD | 200 mW - defines maximum continuous power handling on standard FR4 PCB with recommended pad layout |
| RθJA | 625 °C/W - quantifies thermal performance for ambient temperature derating in enclosed automotive modules |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 rated molding compound, and 0.008 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for current sink operation; connected to ground or low-side return path |
| 2 (Base) | Input node via R1/R2 network | Internal connection point between two 47 kΩ resistors; accepts logic-level input signal |
| 3 (Collector) | Output node | Current-sourcing terminal for driving loads such as LEDs, relays, or gate inputs |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 = R2 bias network | 47 kΩ ±30% - eliminates external resistors and reduces BOM count in digital interface circuits |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress test requirements for temperature cycling, HTRB, and ESD robustness |
| Green construction | Halogen- and antimony-free, RoHS 3 compliant - satisfies environmental compliance for Tier 1 automotive supply chain |
| SOT23 footprint compatibility | Standard 3-pin SOT23 outline - enables drop-in replacement and automated assembly using industry-standard pick-and-place equipment |
Applications
| Automotive LED Indicator Control | Industrial Logic-Level Translation |
|---|---|
|
Use Scenario: Driving discrete indicator LEDs in instrument clusters and body control modules where space and component count are constrained. IC Role / Device Role / Timing Role: NPN pre-biased switch providing current sink path from LED anode to ground. Use Value: Eliminates need for two external bias resistors while maintaining 2 mA drive capability and <0.3 V saturation for minimal power loss. |
Use Scenario: Converting 3.3 V or 5 V microcontroller GPIO outputs to drive higher-current loads like optocoupler inputs or small relays. IC Role / Device Role / Timing Role: Digital inverter with defined VI(ON)/VI(OFF) thresholds ensuring clean logic transitions. Use Value: Provides guaranteed turn-on at 1.9 V and turn-off below 1.1 V, reducing susceptibility to noise in noisy industrial environments. |
| Consumer Appliance Power Sequencing | Medical Diagnostic Equipment Interface |
|
Use Scenario: Enabling/disabling auxiliary power rails or sensor bias supplies in smart home appliances during power-up/down sequences. IC Role / Device Role / Timing Role: Low-power enable switch controlled by MCU GPIO with built-in current limiting via R1/R2. Use Value: Delivers precise 0.5 mA base current at 5 V input, enabling predictable timing margins and repeatable sequencing behavior. |
Use Scenario: Isolating microcontroller I/O from analog front-end circuitry in portable diagnostic tools requiring low leakage and stable biasing. IC Role / Device Role / Timing Role: High-impedance input stage with <0.5 μA off-state leakage, minimizing loading on sensitive analog nodes. Use Value: Achieves 0.5 μA IO(off) at VCC = 50 V, preserving signal integrity in battery-powered medical devices. |
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 |
|---|---|---|---|
| DDTC144ECA-7-F | Same electrical specs but non-automotive grade; no AEC-Q101 qualification or PPAP support | Not approved for automotive production; suitable only for industrial or consumer use | Select when AEC-Q101 compliance is not required and cost optimization is prioritized |
| ADTC144ECAQ-7-F | Successor part with identical R1/R2 = 47 kΩ, improved GL (min 80), and tighter R1 tolerance (±20%) | Backward-compatible pinout and function; designed for next-gen automotive platforms requiring higher gain stability | Choose for new designs targeting extended temperature margin and enhanced current gain consistency |
Compared with DDTC144ECAQ-7-F, DDTC144ECA-7-F lacks automotive qualification but offers identical performance in non-automotive settings, while ADTC144ECAQ-7-F improves gain and resistor tolerance for more demanding automotive applications without changing layout or firmware.
Availability
DDTC144ECAQ-7-F is available at Aetrix Electronics and suitable for automotive LED control, industrial logic translation, and medical diagnostic interface applications requiring stable component supply, AEC-Q101 qualification, and long-term lifecycle support.
Supply support for DDTC144ECAQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.
This part belongs to the DDTC (R1 = R2 Series) CA pre-biased transistor family, engineered to simplify digital interface design in space-constrained, high-volume applications requiring AEC-Q101 compliance and green manufacturing standards.
FAQ
What is the difference between DDTC144ECAQ-7-F and DDTC144ECA-7-F?
DDTC144ECAQ-7-F is the automotive-grade version qualified to AEC-Q101 and PPAP capable, with "Q" denoting automotive qualification in the part number. DDTC144ECA-7-F is the industrial-grade variant with identical electrical specifications but no automotive qualification or associated documentation support.
Can DDTC144ECAQ-7-F replace a standard NPN transistor with external bias resistors?
Yes - it replaces a discrete NPN transistor plus two 47 kΩ base resistors in common-emitter switch configurations. Its internal R1 = R2 network provides the same biasing function, reducing PCB area and assembly steps while maintaining consistent VI(ON)/VI(OFF) thresholds across temperature and process variation.
What is the maximum continuous collector current for DDTC144ECAQ-7-F?
The absolute maximum output current is 30 mA per the datasheet's Absolute Maximum Ratings table. However, the Electrical Characteristics table specifies test conditions up to 2 mA for VO(on) and 68× DC current gain, indicating optimal linear switching operation within that range under typical 5 V supply conditions.
Is DDTC144ECAQ-7-F compatible with lead-free reflow soldering processes?
Yes - it is fully RoHS 3 compliant, lead-free, and halogen-free, with matte tin-plated leads qualified per MIL-STD-202, Method 208. The SOT23 package supports standard lead-free reflow profiles, including peak temperatures up to 260 °C, and has moisture sensitivity level 1 per J-STD-020.
DDTC144ECAQ-7-F 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:
- 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-23-3
DDTC144ECAQ-7-F FAQ
1.How can I place an order for DDTC144ECAQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC144ECAQ-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 DDTC144ECAQ-7-F reliable?
The price and inventory of DDTC144ECAQ-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 DDTC144ECAQ-7-F is usually 5 days.
3.What payment methods are accepted for DDTC144ECAQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC144ECAQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC144ECAQ-7-F?
DDTC144ECAQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC144ECAQ-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 DDTC144ECAQ-7-F?
For technical support, including DDTC144ECAQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC144ECAQ-7-F requirements.
6.How does Aetrix verify that DDTC144ECAQ-7-F is sourced from the original manufacturer or authorized distributors?
All DDTC144ECAQ-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 DDTC144ECAQ-7-F meets industry standards.
7.What is the process for return or replacement of DDTC144ECAQ-7-F?
All DDTC144ECAQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC144ECAQ-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 DDTC144ECAQ-7-F part is unused and in its original packaging.
Return procedure for DDTC144ECAQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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