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Diodes Incorporated DDTA144WKA-7-F
- Part No.:
- DDTA144WKA-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTA144WKA-7-F.pdf
- Description:
- TRANS PREBIAS PNP 50V SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,168
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Product details
Overview
DDTA144WKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated bias resistors R1 = 47 kΩ and R2 = 22 kΩ (R1 ≠ R2), −40 V VCEO, −30 mA IO, and DC current gain (hFE) of −56 at −10 mA IC. It functions as an inverter or digital switch in low-power logic interface circuits.
For engineers reviewing the DDTA144WKA-7-F datasheet, DDTA144WKA-7-F pinout, DDTA144WKA-7-F application, or DDTA144WKA-7-F equivalent, key selection criteria include input voltage range (−10 V to +15 V), output saturation voltage (−0.3 V), built-in resistor tolerance (±30% for R1, ±20% for R2/R1), and thermal resistance (625 °C/W).
Technical Context
This device implements a single PNP bipolar junction transistor with two non-equal on-die base biasing resistors (R1 = 47 kΩ, R2 = 22 kΩ), enabling direct digital input drive without external bias components. Its −10 V to +15 V input voltage range supports TTL/CMOS-compatible level shifting.
The transistor operates as a saturated switch with guaranteed VCE(sat) ≤ −0.3 V at IC = −2 mA and IB = −0.16 mA, and exhibits fT = 250 MHz for high-speed switching applications up to ~10 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40 V - Maximum collector-emitter blocking voltage before breakdown; defines safe operating range in negative-rail switching. |
| IO (Max) | −30 mA - Continuous output current limit; sets maximum load drive capability in digital output stages. |
| R1 / R2 | 47 kΩ / 22 kΩ - Asymmetric internal bias network enabling precise turn-on threshold and reduced external component count. |
| VIN(on) | −2.5 V @ IO = −20 mA - Input voltage required to fully saturate; ensures compatibility with 3.3 V and 5 V logic families. |
| VCE(sat) | ≤ −0.3 V @ IC/IB = −2 mA/−0.16 mA - Low saturation voltage minimizes power loss and improves noise margin in switching nodes. |
| hFE | −56 @ VCE = −10 V, IC = −10 mA - Confirmed DC current gain supports stable biasing under defined load conditions. |
| fT | 250 MHz - Gain-bandwidth product indicates suitability for signal switching up to ~10 MHz with adequate gain margin. |
Pinout & Package
Package: SC-59 - Surface-mount plastic package (2.7–3.0 mm × 1.5–1.7 mm × 0.35–0.50 mm height), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | GND(+) reference terminal | Common return path for input and output; tied to system ground or positive rail in high-side switch configurations. |
| 2 (Collector) | Output node | Switched output terminal; sinks current when active; connects to load between VCC and collector. |
| 3 (Base) | Input control node | Driven through internal R1–R2 divider; accepts logic-level signals directly without external biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric internal bias resistors (R1 ≠ R2) | Enables optimized input threshold and improved noise immunity vs. symmetric resistor networks. |
| Integrated R1 = 47 kΩ, R2 = 22 kΩ | Eliminates need for two external bias resistors, reducing PCB area and BOM count by one component. |
| Guaranteed VCE(sat) ≤ −0.3 V | Ensures low conduction loss and stable logic-low output in digital interface and LED driver applications. |
| Lead-free and RoHS-compliant construction | Meets global environmental compliance requirements without compromising thermal or electrical performance. |
| SC-59 footprint compatibility | Supports automated SMT assembly and reflow processes using standard JEDEC-compliant land patterns. |
Applications
| Logic Level Translation | LED Driver Interface |
|---|---|
|
Use Scenario: Converting 3.3 V microcontroller GPIO outputs to drive −5 V or −12 V logic inputs in mixed-voltage systems. IC Role / Device Role / Timing Role: Inverting level shifter with fixed threshold and rail-to-rail swing capability. Use Value: Eliminates discrete resistor bias network while maintaining <100 ns propagation delay and −0.3 V output low. |
Use Scenario: Driving common-anode LEDs from low-voltage digital controllers in automotive interior lighting. IC Role / Device Role / Timing Role: High-side current sink switch controlling LED cathode connection to ground. Use Value: Delivers −30 mA sink current with <0.3 V drop, enabling efficient dimming via PWM at up to 5 kHz. |
| Microcontroller I/O Expander | Power Supply Sequencing Monitor |
|
Use Scenario: Extending GPIO count on resource-constrained MCUs by adding buffered open-collector outputs. IC Role / Device Role / Timing Role: Digital buffer/inverter stage with built-in pull-up compatibility and ESD-tolerant input. Use Value: Reduces external passive count per channel and maintains consistent −2.5 V turn-on across temperature (−55°C to +150°C). |
Use Scenario: Monitoring delayed power rail activation in multi-rail FPGA or ASIC supplies. IC Role / Device Role / Timing Role: Voltage comparator input stage feeding into a latch or MCU interrupt pin. Use Value: Provides hysteresis-free threshold detection at −10 V with <0.5 μA leakage in off-state, minimizing quiescent current. |
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 |
|---|---|---|---|
| DDTA144VKA-7-F | R1 = 47 kΩ, R2 = 10 kΩ (R2/R1 = 0.21 vs. 0.47); higher input current (−0.36 mA vs. −0.16 mA) | Better suited for lower-threshold logic (e.g., 1.8 V CMOS) but higher static input power | Select when driving from ultra-low-voltage sources where −2.5 V threshold is too high |
| DDTA124XKA-7-F | R1 = 22 kΩ, R2 = 47 kΩ (R2 > R1); VIN(on) = −1.4 V; higher IO = −50 mA | Lower turn-on voltage enables faster edge response in high-speed data lines | Choose for 5 V logic interfaces requiring sub-2 V switching thresholds and higher sink current |
Compared with DDTA144VKA-7-F and DDTA124XKA-7-F, DDTA144WKA-7-F offers the highest input impedance and lowest static power consumption among the three, making it optimal for battery-powered logic translation where input drive strength is not limiting.
Availability
DDTA144WKA-7-F is available at Aetrix Electronics and suitable for logic level translation, LED driver interface, and microcontroller I/O expander applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for DDTA144WKA-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, manufacturing, and sales operations across Asia, Europe, and North America.
This part belongs to the DDTA R1≠R2 series of pre-biased transistors, designed specifically for reducing component count and improving reliability in digital interface, logic buffering, and low-power switching applications.
FAQ
What is the maximum operating temperature for DDTA144WKA-7-F?
The device is rated for junction and storage temperatures from −55 °C to +150 °C. Its thermal resistance (RθJA) is 625 °C/W on FR4 board with recommended pad layout, meaning it can dissipate 200 mW at ambient up to +85 °C without exceeding 150 °C junction temperature.
Does DDTA144WKA-7-F require external bias resistors?
No. It integrates R1 = 47 kΩ and R2 = 22 kΩ on-die, forming a dedicated PNP bias network. This eliminates the need for external base resistors in standard inverter or switch configurations, simplifying layout and improving production yield.
How does the R1 ≠ R2 architecture improve performance over symmetric pre-biased transistors?
The asymmetric ratio (R2/R1 = 0.47) provides sharper turn-on characteristics and better noise rejection compared to 1:1 networks. It yields a well-defined −2.5 V input threshold with tighter distribution across temperature and process variation, critical for reliable logic interfacing.
Can DDTA144WKA-7-F be used in linear amplifier applications?
No. It is characterized and optimized for saturated switching operation only. The datasheet specifies no linear-region parameters (e.g., hFE vs. IC curves beyond −10 mA, linearity, or distortion metrics), and its R1–R2 network prevents stable DC biasing in active-mode amplification.
DDTA144WKA-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:
- Obsolete
- Transistor Type:
- PNP - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 47 kOhms
- Resistor - Emitter Base (R2):
- 22 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 56 @ 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:
- SC-59-3
DDTA144WKA-7-F FAQ
1.How can I place an order for DDTA144WKA-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTA144WKA-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 DDTA144WKA-7-F reliable?
The price and inventory of DDTA144WKA-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 DDTA144WKA-7-F is usually 5 days.
3.What payment methods are accepted for DDTA144WKA-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA144WKA-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTA144WKA-7-F?
DDTA144WKA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTA144WKA-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 DDTA144WKA-7-F?
For technical support, including DDTA144WKA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA144WKA-7-F requirements.
6.How does Aetrix verify that DDTA144WKA-7-F is sourced from the original manufacturer or authorized distributors?
All DDTA144WKA-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 DDTA144WKA-7-F meets industry standards.
7.What is the process for return or replacement of DDTA144WKA-7-F?
All DDTA144WKA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTA144WKA-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 DDTA144WKA-7-F part is unused and in its original packaging.
Return procedure for DDTA144WKA-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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