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Diodes Incorporated DDTA144WUA-7
- Part No.:
- DDTA144WUA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
DDTA144WUA-7.pdf
- Description:
- TRANS PREBIAS PNP 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,624
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Product details
Overview
DDTA144WUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring R1 = 47 kΩ and R2 = 22 kΩ bias resistors, −10 V input voltage rating (VI(on)), −0.3 V output saturation voltage (VO(on)), and −30 mA maximum output current (IO). It functions as a logic-level interface switch in low-power digital control circuits.
For engineers reviewing the DDTA144WUA-7 datasheet, DDTA144WUA-7 pinout, DDTA144WUA-7 application, or DDTA144WUA-7 equivalent, key selection criteria include verified input/output voltage thresholds, confirmed R1/R2 resistor values, validated SOT-323 thermal derating at 625 °C/W, and documented DC current gain of −56 at −10 mA collector current.
Technical Context
This device integrates a PNP bipolar junction transistor with two non-matching on-chip bias resistors (R1 ≠ R2), enabling single-resistor logic-level input drive without external base biasing. Its internal configuration supports direct TTL/CMOS-compatible switching with defined turn-on/off thresholds.
The transistor operates with a guaranteed DC current gain (GL) of −56 at VCE = −10 V and IC = −10 mA, and exhibits a gain-bandwidth product (fT) of 250 MHz under specified test conditions, confirming suitability for moderate-speed digital signal routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R1 Resistor | 47 kΩ ±30% - sets input current limit and defines logic-high threshold |
| R2 Resistor | 22 kΩ ±20% - provides base-emitter feedback path for stable saturation |
| VI(on) | −2.5 V @ IO = −2 mA - minimum negative input voltage to ensure reliable turn-on |
| VO(on) | −0.3 V max @ IO/IL = −2 mA/−0.16 mA - low saturation voltage enables efficient low-side switching |
| GL | −56 min @ VCE = −10 V, IC = −10 mA - ensures sufficient current amplification for load driving |
| PD | 200 mW - maximum power dissipation on FR4 board with recommended pad layout |
| RθJA | 625 °C/W - thermal resistance determines safe operating ambient temperature range |
Pinout & Package
Package: SOT-323 - surface-mount plastic case, UL 94V-0 rated, moisture sensitivity level 1, weight ≈ 0.006 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Base via R1) | Logic input node connected through 47 kΩ resistor to internal base |
| 2 | Emiter (GND/+) | Common reference terminal; connects to system ground or positive rail depending on circuit topology |
| 3 | Output (Collector) | Switched output node; sinks up to −30 mA when active |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased configuration with R1 ≠ R2 | Eliminates need for external base resistors; enables direct logic-level drive with predictable switching thresholds |
| Lead-free / RoHS-compliant construction | Meets global environmental compliance requirements without compromising solderability or reliability |
| Green molding compound | Halogen-free packaging material compliant with Diodes Inc.'s sustainability policy effective from date code 0627 onward |
| Guaranteed DC current gain (GL) | −56 minimum ensures consistent switching performance across production lots and temperature ranges |
Applications
| LED Driver Interface | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving low-current indicator LEDs from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: PNP pre-biased switch providing inverted logic-level current sinking. Use Value: Eliminates discrete base resistor; reduces BOM count and PCB area while maintaining −0.3 V saturation for minimal LED voltage drop. | Use Scenario: Extending limited GPIO count by adding buffered open-collector outputs. IC Role / Device Role / Timing Role: Digital signal inverter and level translator between MCU and peripheral logic. Use Value: −2.5 V VI(on) ensures compatibility with standard CMOS logic families; −30 mA IO supports multiple parallel loads. |
| Power Rail Enable Switch | Level-Shifting Signal Gate |
Use Scenario: Enabling/disabling auxiliary 3.3 V or 5 V power rails in portable electronics. IC Role / Device Role / Timing Role: Low-side enable switch controlling PMOS gate or LDO EN pin. Use Value: −0.3 V VO(on) minimizes voltage loss across switch; 200 mW PD allows continuous operation at full rated current. | Use Scenario: Converting 1.8 V logic signals to 3.3 V domain in mixed-voltage systems. IC Role / Device Role / Timing Role: Active-low level shifter with defined input hysteresis and output drive strength. Use Value: R1/R2 ratio provides stable threshold behavior; −56 GL ensures clean edge transitions up to 10 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTA144VUA-7-F | R1 = 47 kΩ, R2 = 10 kΩ; VI(on) = −3.0 V; GL = −33 | Higher input threshold and lower gain; suited for higher-noise environments requiring stronger input drive | Select when higher noise immunity is needed and lower current gain is acceptable |
| DDTC144WUA-7-F | NPN complement; same R1/R2 values but opposite polarity; VI(on) = +2.5 V | Used in high-side switching or non-inverting configurations where sourcing current is required | Select for NPN-based designs needing identical bias network geometry and thermal profile |
Compared with DDTA144VUA-7-F, DDTA144WUA-7 offers tighter input threshold control (−2.5 V vs −3.0 V) and higher current gain (−56 vs −33), improving sensitivity and drive capability in low-power logic interfaces; versus DDTC144WUA-7-F, it provides complementary PNP functionality essential for sink-type load control and inverted logic paths.
Availability
DDTA144WUA-7 is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller GPIO expansion, and power rail enable switching requiring stable component supply and consistent pre-biased switching behavior.
Supply support for DDTA144WUA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The DDTA series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface applications where simplified PCB layout and guaranteed switching thresholds are critical.
FAQ
What is the maximum continuous output current for DDTA144WUA-7?
The maximum continuous output current (IO) is −30 mA, tested under VCC = −50 V and TA = 25 °C. This rating assumes proper PCB thermal management per AP02001 pad layout; derating applies above 25 °C ambient per the 625 °C/W RθJA specification.
Does DDTA144WUA-7 require an external base resistor?
No. DDTA144WUA-7 integrates two on-die bias resistors (R1 = 47 kΩ, R2 = 22 kΩ), eliminating the need for external base components. The asymmetric R1/R2 configuration ensures stable saturation and predictable turn-on characteristics without additional passive parts.
Is DDTA144WUA-7 compatible with lead-free reflow processes?
Yes. It features matte tin-plated leads over Alloy 42, qualified for standard lead-free reflow profiles (J-STD-020C Level 1 moisture sensitivity). The package uses halogen-free "Green" molding compound compliant with Diodes Inc.'s environmental policy since date code 0627.
How does the R1/R2 ratio affect switching behavior in DDTA144WUA-7?
The R1/R2 ratio of ~2.14 establishes the internal base bias point, directly determining VI(on) (−2.5 V) and VI(off) (−0.8 V). This fixed ratio ensures repeatable logic threshold margins and prevents unintended conduction during slow-rising or noisy input transitions.
DDTA144WUA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Resistor - Base (R1):
- -
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- Frequency - Transition:
- -
- Power - Max:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DDTA144WUA-7 FAQ
1.How can I place an order for DDTA144WUA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTA144WUA-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 DDTA144WUA-7 reliable?
The price and inventory of DDTA144WUA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA144WUA-7 is usually 5 days.
3.What payment methods are accepted for DDTA144WUA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA144WUA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTA144WUA-7?
DDTA144WUA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTA144WUA-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 DDTA144WUA-7?
For technical support, including DDTA144WUA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA144WUA-7 requirements.
6.How does Aetrix verify that DDTA144WUA-7 is sourced from the original manufacturer or authorized distributors?
All DDTA144WUA-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 DDTA144WUA-7 meets industry standards.
7.What is the process for return or replacement of DDTA144WUA-7?
All DDTA144WUA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA144WUA-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 DDTA144WUA-7 part is unused and in its original packaging.
Return procedure for DDTA144WUA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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