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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Diodes Incorporated DDTC115TKA-7-F

Name: DDTC115TKA-7-F
Brand: Diodes Incorporated
SKU: DDTC115TKA-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC115TKA-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: DDTC115TKA-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SC59-3

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Inventory:4,155

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Product details

Overview

DDTC115TKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in 100 kΩ base bias resistor (R1), housed in SC-59 surface-mount package, rated for 50 V V_CEO, 100 mA I_C, and 200 mW P_D, used in digital switching and level-shifting circuits in consumer and industrial control modules.

For engineers reviewing the DDTC115TKA-7-F datasheet, DDTC115TKA-7-F pinout, DDTC115TKA-7-F application, or DDTC115TKA-7-F equivalent, key selection criteria include verified R1 = 100 kΩ tolerance (±30%), h_FE = 100–600 at I_C = 1 mA, V_CE(sat) ≤ 0.3 V at I_C/I_B = 0.5 mA/0.05 mA, and SC-59 thermal resistance of 625 °C/W on FR4 board.

Technical Context

This device integrates a monolithic NPN transistor with a single external-base resistor (R1 only), eliminating need for discrete bias components in low-power digital interface stages. It operates with guaranteed breakdown voltages of 50 V (V_CBO, V_CEO) and 5 V (V_EBO), supporting robust noise immunity in 3.3 V and 5 V logic systems.

The transistor delivers DC current gain (h_FE) from 100 to 600 under standard test conditions (I_C = 1 mA, V_CE = 5 V), and exhibits f_T = 250 MHz, enabling reliable operation in moderate-speed switching applications up to ~10 MHz edge rates.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before avalanche, suitable for 24 V industrial I/O and 5 V logic interfacing
I_C (max)	100 mA - Continuous collector current rating, supports driving LEDs, small relays, or logic gate inputs
R1	100 kΩ ±30% - Integrated base bias resistor enables direct microcontroller GPIO connection without external pull-up/down
V_CE(sat)	≤0.3 V at I_C/I_B = 0.5 mA/0.05 mA - Ensures low conduction loss and minimal voltage drop in saturated switch mode
h_FE	100–600 at I_C = 1 mA, V_CE = 5 V - Wide gain range accommodates production variation while maintaining reliable turn-on margin
P_D	200 mW - Power dissipation limit on FR4 PCB defines maximum continuous switching duty at ambient temperature
f_T	250 MHz - Gain-bandwidth product confirms suitability for signal routing and fast digital edge handling

Pinout & Package

Package: SC-59 (SOT-23 variant), molded plastic case with UL 94V-0 flammability rating, moisture sensitivity level 1, and matte tin-plated copper leadframe.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for current flow; connects to ground or low-side return path in common-emitter configuration
2 (Base)	Base input with internal R1	Single-point bias input; R1 connects internally between pin 2 and collector (pin 3), enabling simplified drive
3 (Collector)	Collector output	Switched high-side output node; connects to load supply rail and drives downstream logic or passive loads

Key Features

Feature	Design Value
Integrated R1 bias resistor	100 kΩ ±30% eliminates external bias network, reducing BOM count and PCB area in GPIO interface designs
SC-59 package	Standardized SMT footprint compatible with automated assembly and reflow processes; 0.008 g weight supports lightweight portable electronics
Lead-free/RoHS-compliant construction	Matte tin finish over copper leadframe meets global environmental compliance requirements without solderability compromise
High V_CEO/V_CBO	50 V rating allows use in 24 V industrial control systems and automotive body electronics with margin against transients

Applications

Industrial Sensor Interface

Microcontroller GPIO Expander

Use Scenario: Level-shifting and isolation between 3.3 V MCU outputs and 24 V field sensors in PLC I/O modules.

IC Role / Device Role / Timing Role: NPN switch configured as low-side driver, turning on/off sensor power rails or pull-up networks.

Use Value: Built-in 100 kΩ R1 ensures predictable base current and saturation at 3.3 V GPIO levels, eliminating design iteration on external resistor values.

Use Scenario: Driving multiple LED indicators or optocoupler inputs from limited GPIO pins on embedded controllers.

IC Role / Device Role / Timing Role: Digital switch providing current gain and voltage translation between MCU logic and higher-current loads.

Use Value: V_CE(sat) ≤ 0.3 V minimizes power loss and heat generation during sustained LED drive, extending battery life in portable devices.

Consumer Appliance Control

Automotive Body Electronics

Use Scenario: Controlling solenoid valves and small relays in washing machines and HVAC control boards.

IC Role / Device Role / Timing Role: Saturated-mode switch managing 12 V/50 mA actuator loads with fast turn-on/turn-off response.

Use Value: h_FE ≥ 100 guarantees full saturation even with worst-case gain, ensuring reliable relay coil energization across temperature and process variation.

Use Scenario: Signal conditioning and load switching in door module ECUs for mirror/window controls.

IC Role / Device Role / Timing Role: Interface buffer isolating MCU pins from noisy 12 V vehicle bus environments.

Use Value: 50 V V_CEO and -55 to +150 °C operating range meet AEC-Q101 stress requirements for under-hood and cabin applications.

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
NSBC115T1G	Same R1 = 100 kΩ, but SOT-23 package with different pinout (Emitter/Base/Collector vs. Emitter/Base/Collector in SC-59); slightly lower h_FE min (80 vs. 100)	Compatible in layout if pad stack matches; requires verification of thermal derating on target PCB	Select when sourcing flexibility is needed and SOT-23 footprint is already standardized in design
EMH115T2R	R1 = 100 kΩ, same SC-59 package, but h_FE min = 80 and V_CE(sat) max = 0.4 V at same test condition	Acceptable where marginal V_CE(sat) increase does not impact system voltage budget	Prefer when cost optimization is prioritized and gain margin is sufficient for target load

Compared with NSBC115T1G and EMH115T2R, DDTC115TKA-7-F offers highest guaranteed h_FE minimum (100) and lowest V_CE(sat) (≤0.3 V), making it optimal for designs requiring tight saturation voltage control and robust turn-on margin across temperature and process variation.

Availability

DDTC115TKA-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO expansion, and consumer appliance control requiring stable component supply and long-term manufacturability.

Supply support for DDTC115TKA-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, application-optimized components for industrial, computing, and consumer markets.

This part belongs to the DDTC R1-only pre-biased transistor series, designed specifically to simplify digital interface design by integrating critical biasing into the package-reducing external component count and improving layout efficiency in space-constrained applications.

FAQ

What is the exact pin configuration of DDTC115TKA-7-F?

The DDTC115TKA-7-F uses SC-59 (SOT-23-compatible) pinout: Pin 1 = Emitter, Pin 2 = Base (internally connected to R1), Pin 3 = Collector. This matches JEDEC TO-236AB mechanical standard and is verified in Diodes' DS30339 Rev. 6 schematic diagram and mechanical drawing.

Does DDTC115TKA-7-F require an external base resistor?

No. The device integrates a single 100 kΩ base bias resistor (R1) between base and collector terminals. No external resistor is needed for standard digital switching applications driven by 3.3 V or 5 V logic outputs, as confirmed in the "Built-In Biasing Resistor, R1 only" feature list and electrical test conditions.

Is DDTC115TKA-7-F qualified for automotive use?

DDTC115TKA-7-F is not AEC-Q101 qualified. While its operating temperature range (-55 to +150 °C) meets automotive ambient requirements, Diodes Incorporated does not list it in their AEC-Q101 product portfolio, and no qualification report is published for this specific part number per official documentation.

How does the 100 kΩ R1 tolerance affect circuit performance?

The ±30% R1 tolerance directly impacts base current magnitude, causing up to ±30% variation in I_B and thus affecting saturation margin. At worst case (R1 = 130 kΩ), I_B drops ~23%, requiring verification that h_FE remains sufficient to maintain V_CE(sat) ≤ 0.3 V under all operating conditions per datasheet test setup.

DDTC115TKA-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:: NPN - Pre-Biased

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Resistor - Base (R1):: 100 kOhms

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 100µA, 1mA

Current - Collector Cutoff (Max):: 500nA (ICBO)

Frequency - Transition:: 250 MHz

Power - Max:: 200 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-59-3

DDTC115TKA-7-F FAQ

1.How can I place an order for DDTC115TKA-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC115TKA-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 DDTC115TKA-7-F reliable?

The price and inventory of DDTC115TKA-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 DDTC115TKA-7-F is usually 5 days.

3.What payment methods are accepted for DDTC115TKA-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC115TKA-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC115TKA-7-F?

DDTC115TKA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC115TKA-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 DDTC115TKA-7-F?

For technical support, including DDTC115TKA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC115TKA-7-F requirements.

6.How does Aetrix verify that DDTC115TKA-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC115TKA-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 DDTC115TKA-7-F meets industry standards.

7.What is the process for return or replacement of DDTC115TKA-7-F?

All DDTC115TKA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC115TKA-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 DDTC115TKA-7-F part is unused and in its original packaging.

Return procedure for DDTC115TKA-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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