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Diodes Incorporated DDTC144TUA-7
- Part No.:
- DDTC144TUA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTC144TUA-7.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
DDTC144TUA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in 47 kΩ bias resistor (R1 only), housed in a SOT323 surface-mount package. It delivers VCEO = 50 V, IC(max) = 100 mA, VCE(sat) ≤ 0.3 V at IC/IB = 1 mA/0.1 mA, hFE = 100–600, and operates across –55°C to +150°C - used in discrete logic-level switching and signal conditioning circuits.
For engineers reviewing the DDTC144TUA-7 datasheet, DDTC144TUA-7 pinout, DDTC144TUA-7 application, or DDTC144TUA-7 equivalent, key selection criteria include verified R1 tolerance (±30%), guaranteed VCE(sat) performance under low-base-drive conditions, thermal derating on FR4 PCBs, and compatibility with automated SMT assembly for space-constrained consumer and industrial control boards.
Technical Context
This device integrates a single base-emitter biasing resistor (R1 = 47 kΩ ±30%) to simplify NPN switching design, eliminating external bias components. Its epitaxial planar die construction ensures stable hFE and low leakage (ICBO, IEBO ≤ 0.5 µA), while the SOT323 package supports high-density layouts and meets J-STD-020 Level 1 moisture sensitivity.
It operates as a digital switch or linear amplifier with DC current transfer ratio specified at IC = 1 mA, VCE = 5 V, and exhibits fT = 250 MHz - enabling use in low-frequency signal routing and interface buffering where predictable turn-on threshold and saturation voltage are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V and 36 V rail applications. |
| IC(max) | 100 mA - Continuous collector current rating; supports driving LEDs, small relays, or logic inputs without external heat sinking. |
| VCE(sat) | ≤0.3 V at IC/IB = 1 mA/0.1 mA - Ensures low conduction loss and minimal self-heating during saturated switching. |
| hFE | 100–600 at IC = 1 mA, VCE = 5 V - Wide DC gain range allows robust operation across process and temperature variation. |
| R1 | 47 kΩ ±30% - Single integrated base resistor sets turn-on threshold; eliminates need for external bias network. |
| PD | 200 mW on FR4 board - Defines maximum power handling with standard pad layout; requires thermal derating above +25°C ambient. |
| TJ | –55°C to +150°C - Extended junction temperature range supports automotive cabin and industrial motor-control environments. |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.15 mm × 2.10 mm × 0.95 mm), lead-free, halogen-free, RoHS-compliant, moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for current flow; connected to ground or low-side return path in common-emitter configurations. |
| 2 (Base) | Base input with internal R1 | Input node tied internally to 47 kΩ resistor; accepts TTL/CMOS-compatible drive without external pull-up/down. |
| 3 (Collector) | Collector output | Switched high-side output node; connects to load supply rail and drives downstream circuitry or loads. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | 47 kΩ ±30% - Reduces BOM count and PCB area by replacing two external resistors in classic base-bias topology. |
| SOT323 footprint | 2.15 mm × 2.10 mm - Enables placement in tight spaces such as wearable sensors and portable power management modules. |
| Lead-free & green construction | Halogen- and antimony-free molding compound (Br+Cl <1500 ppm, Sb <1000 ppm) - Meets automotive and industrial environmental compliance mandates. |
| Automated assembly compatibility | Matte tin-plated leads, solderable per MIL-STD-202 Method 208 - Ensures reliable reflow yield in high-volume SMT lines. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
|
Use Scenario: Driving indicator LEDs from 3.3 V or 5 V microcontroller outputs with limited sink/source capability. IC Role / Device Role / Timing Role: Discrete NPN switch providing current amplification and level translation between MCU I/O and LED anode/cathode. Use Value: Eliminates need for external base resistor; VCE(sat) ≤ 0.3 V ensures >90% LED forward voltage utilization and minimal power loss. |
Use Scenario: Extending digital I/O count on resource-constrained MCUs using simple transistor-based open-collector buffers. IC Role / Device Role / Timing Role: Low-latency, non-inverting digital buffer that replicates GPIO state to external peripherals or status indicators. Use Value: hFE ≥ 100 guarantees full saturation with 0.1 mA base drive, enabling direct connection to 3.3 V logic without level shifters. |
| Power Supply Enable Control | Industrial Sensor Interface |
|
Use Scenario: Enabling/disabling auxiliary power rails (e.g., 12 V or 24 V) via microcontroller command in embedded power systems. IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling PMOS/NMOS gate drive or optocoupler input. Use Value: 50 V VCEO and 100 mA IC support direct control of intermediate-voltage enable signals without additional protection circuitry. |
Use Scenario: Conditioning analog sensor outputs (e.g., thermistor or potentiometer wipers) before ADC sampling in factory automation nodes. IC Role / Device Role / Timing Role: Linear-mode current amplifier or emitter-follower buffer isolating sensitive analog paths from noisy digital domains. Use Value: Stable hFE and low ICBO (≤0.5 µA) minimize offset drift and leakage-induced measurement error over –40°C to +85°C operating range. |
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 |
|---|---|---|---|
| DDTC124TUA-7-F | R1 = 22 kΩ ±30%, lower base resistance increases base current demand for same collector current. | Better suited for higher-speed switching where faster turn-on is required, but less efficient at low-drive logic levels. | Select when driving heavier loads (>5 mA) or when tighter VBE(on) control is needed at elevated temperatures. |
| DDTC143TUA-7-F | R1 = 4.7 kΩ ±30%, tenfold lower resistance yields ~10× higher base current at same VIN. | Optimized for 3.3 V logic with marginal noise margin; may overdrive base in 1.8 V systems causing excess power dissipation. | Prefer for legacy 5 V systems or when fast saturation recovery is prioritized over base drive efficiency. |
Compared with DDTC124TUA-7-F and DDTC143TUA-7-F, DDTC144TUA-7 offers optimal base-resistor scaling for modern low-power 3.3 V microcontrollers - balancing sufficient drive strength against minimal quiescent current and thermal loading in always-on sensing nodes.
Availability
DDTC144TUA-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and power supply enable control requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for DDTC144TUA-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, industry-qualified components for automotive, industrial, and consumer markets.
This part belongs to the DDTC (R1-only series) pre-biased transistor family, designed specifically to reduce design complexity and PCB area in digital interface and low-power switching applications where single-resistor biasing improves manufacturability and testability.
FAQ
What is the function of the internal 47 kΩ resistor in DDTC144TUA-7?
The internal 47 kΩ resistor (R1) connects between the base and emitter terminals, forming a fixed-current bias network that replaces external base resistors. It ensures reliable NPN transistor turn-on with standard logic-level inputs (e.g., 3.3 V CMOS), reduces component count, and improves layout repeatability in high-volume SMT assembly.
Can DDTC144TUA-7 be used in automotive applications?
DDTC144TUA-7 is not AEC-Q101 qualified out-of-the-box, but Diodes Incorporated offers automotive-grade variants of the R1-only series with PPAP capability and IATF 16949 manufacturing. For automotive use, contact Diodes directly to obtain qualified versions with full change control and qualification documentation.
How does the SOT323 package affect thermal performance?
In the SOT323 package, DDTC144TUA-7 achieves RθJA = 625°C/W on FR4 PCBs with minimum recommended pad layout. This limits continuous power dissipation to 200 mW at +25°C ambient; designers must apply linear derating above that temperature - e.g., 160 mW at +65°C - to maintain TJ ≤ 150°C.
Is DDTC144TUA-7 compatible with lead-free reflow profiles?
Yes - DDTC144TUA-7 is fully RoHS-compliant and lead-free, with matte tin-plated leads rated for solderability per MIL-STD-202, Method 208. It supports standard JEDEC J-STD-020 Class 1 moisture sensitivity and withstands peak reflow temperatures up to 260°C for ≤40 seconds without degradation.
DDTC144TUA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- DDTC (R1 ONLY SERIES) UA
- 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):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 250µA, 2.5mA
- Current - Collector Cutoff (Max):
- 500nA (ICBO)
- Frequency - Transition:
- 250 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
DDTC144TUA-7 FAQ
1.How can I place an order for DDTC144TUA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC144TUA-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 DDTC144TUA-7 reliable?
The price and inventory of DDTC144TUA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC144TUA-7 is usually 5 days.
3.What payment methods are accepted for DDTC144TUA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC144TUA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC144TUA-7?
DDTC144TUA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC144TUA-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 DDTC144TUA-7?
For technical support, including DDTC144TUA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC144TUA-7 requirements.
6.How does Aetrix verify that DDTC144TUA-7 is sourced from the original manufacturer or authorized distributors?
All DDTC144TUA-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 DDTC144TUA-7 meets industry standards.
7.What is the process for return or replacement of DDTC144TUA-7?
All DDTC144TUA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC144TUA-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 DDTC144TUA-7 part is unused and in its original packaging.
Return procedure for DDTC144TUA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDTC144TUA-7 Tags
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