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

Diodes Incorporated DDTC143TKA-7-F

Name: DDTC143TKA-7-F
Brand: Diodes Incorporated
SKU: DDTC143TKA-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC143TKA-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

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

Datasheet:: DDTC143TKA-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SC59-3

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Product details

Overview

DDTC143TKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in 4.7 kΩ base resistor (R1), housed in SC-59 package, rated for 50 V V_CEO, 100 mA I_C, and 200 mW P_D; used in digital switching and level translation circuits in portable power management and LED driver stages.

For engineers reviewing the DDTC143TKA-7-F datasheet, DDTC143TKA-7-F pinout, DDTC143TKA-7-F application, or DDTC143TKA-7-F equivalent, key selection criteria include verified R1 tolerance (±30%), guaranteed h_FE range (100–600 at I_C = 1 mA), V_CE(sat) ≤ 0.3 V at I_C/I_B = 1 mA/0.1 mA, and SC-59 thermal performance (R_θJA = 625 °C/W on FR4).

Technical Context

This device integrates a monolithic NPN transistor with a precision-trimmed 4.7 kΩ base biasing resistor (R1 only), eliminating external bias components in saturated-switch applications. It operates as a digital switch with guaranteed turn-on behavior at low input drive levels (V_IN ≥ 0.2 V) and supports fast switching up to 250 MHz f_T.

The SC-59 package enables high-density placement in space-constrained PCBs while maintaining thermal stability across –55 °C to +150 °C operating range. Its "Green" molding compound complies with UL 94V-0 and RoHS, with moisture sensitivity Level 1 per J-STD-020C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown; ensures safe operation in 3.3 V/5 V logic interface and 12 V auxiliary rail switching.
I_C (max)	100 mA - Continuous collector current rating; suitable for driving LEDs, small relays, or logic-level MOSFET gates.
V_CE(sat)	≤ 0.3 V at I_C/I_B = 1 mA/0.1 mA - Low saturation voltage minimizes power loss and heat generation in on-state switching.
h_FE	100–600 at I_C = 1 mA, V_CE = 5 V - Wide DC current gain range ensures reliable turn-on margin across process and temperature variation.
R1	4.7 kΩ ±30% - Integrated base resistor simplifies PCB layout and eliminates discrete bias network; tolerance validated per datasheet test condition.
f_T	250 MHz - Gain-bandwidth product confirms suitability for high-speed digital signal routing and pulse-width modulation (PWM) control paths.

Pinout & Package

Package: SC-59 - surface-mount, 3-terminal plastic package with gull-wing leads; dimensions: A = 0.35–0.50 mm, B = 1.50–1.70 mm, C = 2.70–3.00 mm, H = 2.90–3.10 mm; weight ≈ 0.008 g; UL 94V-0 rated.

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 switch configuration.
2 (Base)	Input control node	Connected internally to R1; accepts TTL/CMOS-compatible logic-level drive without external pull-up/down.
3 (Collector)	Output current sink	Drives load (e.g., LED anode or MOSFET gate) when biased; handles up to 100 mA continuous current.

Key Features

Feature	Design Value
Integrated R1 bias resistor	4.7 kΩ ±30% - reduces component count by one resistor and eliminates layout-dependent bias drift in production.
Guaranteed saturation performance	V_CE(sat) ≤ 0.3 V at I_C/I_B = 1 mA/0.1 mA - ensures predictable low-loss switching even under marginal drive conditions.
High h_FE range	100–600 - provides robust turn-on margin across temperature (–55 °C to +150 °C) and manufacturing spread.
RoHS-compliant "Green" construction	Halogen-free molding compound, matte tin lead finish - meets environmental compliance requirements without sacrificing solderability or reliability.

Applications

LED Driver Stage

Microcontroller GPIO Expander

Use Scenario: Driving indicator LEDs from 3.3 V MCU outputs with limited sink current capability.

IC Role / Device Role: Digital switch that translates logic-high to LED-on state with minimal external components.

Use Value: Eliminates need for discrete base resistor and reduces BOM count; V_CE(sat) ≤ 0.3 V ensures >90% LED forward voltage utilization.

Use Scenario: Adding extra low-side switch outputs to resource-constrained microcontrollers.

IC Role / Device Role: Current-sinking buffer for expanding GPIO count without loading MCU pins.

Use Value: Guaranteed h_FE ≥ 100 at I_C = 1 mA enables reliable switching with weak MCU drive (e.g., 0.1 mA base current).

Load Switch for Sensor Bias

Level Translator for Legacy Logic

Use Scenario: Enabling/disabling bias current to analog sensors (e.g., thermistors, photodiodes) during sleep mode.

IC Role / Device Role: Power-gating transistor controlled by system enable signal.

Use Value: Low I_CBO ≤ 0.5 μA and high V_CEO = 50 V prevent leakage-induced sensor offset and support 12 V bias rails.

Use Scenario: Interfacing 5 V legacy peripherals with 3.3 V microcontrollers in mixed-voltage systems.

IC Role / Device Role: Unidirectional level shifter using saturated NPN topology.

Use Value: R1 = 4.7 kΩ sets optimal base current for clean 0 V / 5 V transitions; f_T = 250 MHz supports >1 MHz data rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar pre-biased NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NSV143T1T1G	Same R1 = 4.7 kΩ, but SOT-23 package; higher R_θJA = 750 °C/W; h_FE min = 80.	Lower power dissipation margin due to smaller thermal footprint; less suitable for sustained 100 mA loads.	Select if board space is constrained and peak I_C < 60 mA.
EMH11T2R	R1 = 4.7 kΩ, SC-70 package; V_CEO = 50 V, but I_C max = 80 mA; h_FE = 120–470.	Reduced current rating limits use in relay or high-brightness LED drivers.	Prefer for ultra-compact designs where 80 mA suffices and thermal load is light.

Compared with NSV143T1T1G and EMH11T2R, DDTC143TKA-7-F offers superior thermal performance (R_θJA = 625 °C/W) and full 100 mA rating in SC-59-making it optimal for industrial-grade digital switching where reliability under sustained load matters.

Availability

DDTC143TKA-7-F is available at Aetrix Electronics and suitable for LED driver stages, microcontroller GPIO expansion, and sensor bias load switching requiring stable component supply and long-term manufacturability.

Supply support for DDTC143TKA-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 power management, signal integrity, and protection.

This part belongs to the DDTC R1-only pre-biased transistor family, designed specifically to replace discrete transistor + resistor combinations in cost-sensitive, high-volume digital interface and switching applications.

FAQ

What is the exact value and tolerance of the internal base resistor R1?

The internal base resistor R1 is 4.7 kΩ with a tolerance of ±30%, as specified in the Electrical Characteristics table and confirmed in the Ordering Information section of the DS30339 datasheet. This tolerance is tested and guaranteed across production lots and applies under standard operating conditions (T_A = 25 °C).

Can DDTC143TKA-7-F be used in linear amplifier configurations?

No-this device is optimized and characterized exclusively for saturated switching operation. Its h_FE specification is given at I_C = 1 mA and V_CE = 5 V, and no linearity, distortion, or small-signal parameters (e.g., r_π, g_m) are provided. Use only in digital on/off roles per datasheet guidance.

Is the SC-59 package compatible with standard reflow profiles for lead-free assembly?

Yes-the DDTC143TKA-7-F uses matte tin-plated copper leadframes and "Green" molding compound qualified for lead-free reflow. Its moisture sensitivity level is Level 1 per J-STD-020C, meaning it can be stored indefinitely at ≤30 °C/60% RH and processed using standard IPC/JEDEC J-STD-020D profile without baking.

How does V_CE(sat) vary with temperature and current?

V_CE(sat) increases slightly with temperature and collector current: typical values are ≤0.3 V at I_C/I_B = 1 mA/0.1 mA and 25 °C, rising to ≤0.35 V at 100 °C per Figure 2 in DS30339. At I_C = 10 mA, V_CE(sat) remains ≤0.3 V under same bias ratio, confirming stable saturation across its rated range.

DDTC143TKA-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):: 4.7 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:: SC-59-3

DDTC143TKA-7-F FAQ

1.How can I place an order for DDTC143TKA-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC143TKA-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 DDTC143TKA-7-F reliable?

The price and inventory of DDTC143TKA-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 DDTC143TKA-7-F is usually 5 days.

3.What payment methods are accepted for DDTC143TKA-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC143TKA-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC143TKA-7-F?

DDTC143TKA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC143TKA-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 DDTC143TKA-7-F?

For technical support, including DDTC143TKA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC143TKA-7-F requirements.

6.How does Aetrix verify that DDTC143TKA-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC143TKA-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 DDTC143TKA-7-F meets industry standards.

7.What is the process for return or replacement of DDTC143TKA-7-F?

All DDTC143TKA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC143TKA-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 DDTC143TKA-7-F part is unused and in its original packaging.

Return procedure for DDTC143TKA-7-F:

1.Submit a request within 90 days.

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

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