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

Diodes Incorporated DDTC144GUA-7-F

Name: DDTC144GUA-7-F
Brand: Diodes Incorporated
SKU: DDTC144GUA-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC144GUA-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: DDTC144GUA-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:6,000

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Product details

Overview

DDTC144GUA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT-323 package, featuring a built-in 47 kΩ bias resistor (R2 only), 50 V V_CEO, 100 mA I_C(max), and h_FE = 68 at 5 mA/5 V - used for digital switching and level translation in portable power management circuits.

For engineers reviewing the DDTC144GUA-7-F datasheet, DDTC144GUA-7-F pinout, DDTC144GUA-7-F application, or DDTC144GUA-7-F equivalent, key selection criteria include R2-only bias topology, V_CEO/V_CBO rating, h_FE tolerance, ESD robustness, and SOT-323 thermal derating behavior under pulsed vs. DC loads.

Technical Context

This device implements a single-NPN transistor with integrated base-emitter pull-down resistor (R2 = 47 kΩ ±30%), eliminating external bias components in high-speed digital interface stages. It operates within -55°C to +150°C and supports 0.3 V V_CE(sat) at I_C = 10 mA / I_B = 0.5 mA.

The R2-only configuration enables direct microcontroller GPIO drive without external resistors, while its 250 MHz f_T and low C_OB (<10 pF at 5 V) support clean edge response in 1–10 MHz switching applications such as LED drivers and logic buffers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports rail-to-rail switching up to 5 V logic with margin for transient spikes
I_C(max)	100 mA - suitable for driving small relays, LEDs, or logic inputs without heatsinking
R2 (bias)	47 kΩ ±30% - sets fixed base current for predictable saturation in digital on/off control
h_FE	68 min at 5 mA/5 V - ensures reliable turn-on with low drive current from 3.3 V MCU outputs
V_CE(sat)	0.3 V max at I_C = 10 mA/I_B = 0.5 mA - minimizes conduction loss in battery-powered load switching
f_T	250 MHz - enables use in fast-switching digital interfaces up to ~10 MHz clock rates
P_D	200 mW - requires PCB pad layout per AP02001 for full thermal rating at ambient ≤70°C

Pinout & Package

Package: SOT-323 - surface-mount, 3-terminal plastic case (0.006 g), UL 94V-0 rated, moisture sensitivity Level 1, lead-free matte tin plating.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for bias network; connects to ground or low-side return path
2 (Base)	Base input	Driven directly by MCU GPIO; internal R2 pulls base to emitter when inactive
3 (Collector)	Collector output	Switches load between V_CC and this pin; handles up to 100 mA continuous current

Key Features

Feature	Design Value
R2-only bias topology	Eliminates need for external base resistor - reduces BOM count and layout area in space-constrained designs
47 kΩ integrated R2	Optimized for 3.3 V/5 V logic drive - delivers ~68 μA base current enabling full saturation at 10 mA collector load
V_CEO = 50 V	Provides 10× safety margin over standard 5 V supply rails - improves reliability in noisy industrial environments
Moisture Sensitivity Level 1	Allows unlimited floor life before reflow - simplifies inventory handling and eliminates bake requirements
Green molding compound	Halogen-free, RoHS-compliant packaging - meets IPC-1752A reporting and automotive PPAP documentation needs

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU pins in handheld medical devices.

IC Role / Device Role / Timing Role: Digital switch controlling LED anode connection to V_CC; operates in saturated on/off mode.

Use Value: Eliminates external base resistor, reducing component count and PCB area while maintaining <0.3 V dropout across battery life.

Use Scenario: Adding discrete logic-level translation for legacy 5 V peripherals interfaced to modern 3.3 V SoCs.

IC Role / Device Role / Timing Role: Level shifter converting 3.3 V logic high to 5 V-compatible output swing.

Use Value: Achieves <10 ns propagation delay with no external biasing, supporting 5 MHz SPI bus timing margins.

Power Sequencing Control

Load Switch for Sensor Modules

Use Scenario: Enabling/disabling auxiliary 3.3 V sensor rails during sleep/wake transitions in IoT edge nodes.

IC Role / Device Role / Timing Role: Low-side power switch controlled by PMIC enable signal.

Use Value: Delivers 0.3 V V_CE(sat) at 50 mA load, limiting power loss to <15 mW and avoiding thermal throttling.

Use Scenario: Isolating MEMS accelerometer supply during standby to reduce system quiescent current.

IC Role / Device Role / Timing Role: High-side or low-side load disconnect switch activated by host processor.

Use Value: Supports fast turn-off (<100 ns) with minimal leakage (I_EBO = 65 μA @ 4 V), preserving battery runtime.

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
DDTC124GUA-7-F	R2 = 22 kΩ, h_FE = 56 min - higher base current, lower gain	Better suited for 1.8 V logic drive where higher I_B compensates for reduced V_BE headroom	Select when driving heavier loads (>20 mA) from low-voltage MCUs with limited I_OH
DDTC115GUA-7-F	R2 = 100 kΩ, h_FE = 82 min - lower base current, higher gain	Preferred for ultra-low-power wake-up circuits requiring <10 μA standby base leakage	Choose for battery-critical applications where I_EBO = 30 μA and lower drive current are prioritized

Compared with DDTC124GUA-7-F and DDTC115GUA-7-F, the DDTC144GUA-7-F strikes a balance between base drive efficiency and gain stability - optimal for 3.3 V systems needing consistent 10–50 mA switching without excessive base loading or gain variation.

Availability

DDTC144GUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and power sequencing control requiring stable component supply and long-term production continuity.

Supply support for DDTC144GUA-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, energy-efficient components for industrial, computing, and consumer markets.

The DDTC R2-only series targets cost-sensitive, space-constrained digital interface applications - designed to replace discrete transistor + resistor combinations in portable and battery-powered electronics.

FAQ

What is the function of the R2-only bias configuration in DDTC144GUA-7-F?

The R2-only configuration integrates a single 47 kΩ resistor between base and emitter, providing automatic turn-off without requiring an external pull-down. This simplifies circuit design for digital switching, reduces component count, and ensures predictable saturation behavior when driven by open-drain or push-pull logic outputs.

Can DDTC144GUA-7-F be used in linear amplifier applications?

No - this device is optimized for digital switching operation, not linear amplification. Its h_FE is specified only at I_C = 5 mA/V_CE = 5 V, and it lacks guaranteed linearity, frequency response flatness, or thermal stability required for analog gain stages.

What is the maximum allowable continuous collector current at 85°C ambient?

At 85°C ambient, derating per Figure 1 reduces P_D to ~125 mW. With V_CE(sat) ≤ 0.3 V, maximum continuous I_C is approximately 417 mA in theory, but the absolute I_C(max) rating remains 100 mA - so 100 mA is the hard limit regardless of temperature.

Is DDTC144GUA-7-F compatible with lead-free reflow profiles?

Yes - it uses matte tin-plated leads and complies with J-STD-020C Level 1 moisture sensitivity. Standard lead-free reflow profiles (peak 260°C, 10 s max) are fully supported without preconditioning or baking.

DDTC144GUA-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: DDTC (R2-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):: -

Resistor - Emitter Base (R2):: 47 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 68 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 500µA, 10mA

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

DDTC144GUA-7-F FAQ

1.How can I place an order for DDTC144GUA-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC144GUA-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 DDTC144GUA-7-F reliable?

The price and inventory of DDTC144GUA-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 DDTC144GUA-7-F is usually 5 days.

3.What payment methods are accepted for DDTC144GUA-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC144GUA-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC144GUA-7-F?

DDTC144GUA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC144GUA-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 DDTC144GUA-7-F?

For technical support, including DDTC144GUA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC144GUA-7-F requirements.

6.How does Aetrix verify that DDTC144GUA-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC144GUA-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 DDTC144GUA-7-F meets industry standards.

7.What is the process for return or replacement of DDTC144GUA-7-F?

All DDTC144GUA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC144GUA-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 DDTC144GUA-7-F part is unused and in its original packaging.

Return procedure for DDTC144GUA-7-F:

1.Submit a request within 90 days.

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

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