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

Diodes Incorporated DDTC115GUA-7

Name: DDTC115GUA-7
Brand: Diodes Incorporated
SKU: DDTC115GUA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC115GUA-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTC115GUA-7.pdf

Description:: TRANS PREBIAS NPN 200MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:6,043

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Product details

Overview

DDTC115GUA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor with built-in 100 kΩ bias resistor (R2 only), 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 consumer electronics.

For engineers reviewing the DDTC115GUA-7 datasheet, DDTC115GUA-7 pinout, DDTC115GUA-7 application, or DDTC115GUA-7 equivalent, key selection criteria include verified R2-only bias topology, SOT-323 package thermal performance (R_θJA = 625 °C/W), h_FE = 82 at 5 mA/5 V, and guaranteed V_CE(sat) ≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA.

Technical Context

This device implements a single-NPN transistor with monolithic integration of a 100 kΩ base-emitter pull-up resistor (R2), eliminating external bias components. It operates as a digital switch with defined saturation behavior under I_C/I_B = 20 drive conditions and supports ambient temperatures from –55 °C to +150 °C.

The SOT-323 package enables high-density PCB layout while maintaining thermal dissipation capability per JEDEC J-STD-020C Level 1 moisture sensitivity. Its epitaxial planar die construction ensures stable h_FE and low leakage (I_EBO ≤ 58 μA at V_EB = 4 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in 3.3 V/5 V logic interface applications.
I_C (max)	100 mA - Continuous collector current rating; supports driving LEDs, small relays, or logic gate inputs.
P_D	200 mW - Power dissipation limit on FR4 board with recommended pad layout; constrains duty cycle in pulsed switching.
h_FE	82 (min) at I_C = 5 mA, V_CE = 5 V - Confirmed DC current gain; ensures reliable saturation with standard microcontroller GPIO drive.
V_CE(sat)	≤ 0.3 V at I_C = 10 mA, I_B = 0.5 mA - Low saturation voltage reduces power loss and improves logic-level compatibility.
R2	100 kΩ ±30% - Integrated base-emitter bias resistor; eliminates need for external resistor in simple switch configurations.
f_T	250 MHz (typ) - Gain-bandwidth product; confirms suitability for low-speed digital signal routing, not RF use.

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic package (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height), RoHS-compliant, matte tin-plated leads, UL 94V-0 rated, moisture sensitivity Level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for bias network; connects to ground or low-side return path in common-emitter switch.
2 (Base)	Base terminal	Input control node; internally connected to R2 top; accepts TTL/CMOS logic-level signals directly.
3 (Collector)	Collector terminal	Output switching node; sinks load current when biased; requires external pull-up for active-low operation.

Key Features

Feature	Design Value
Integrated R2 bias resistor	100 kΩ ±30% - Enables single-GPIO control without external biasing components; reduces BOM count and layout area.
Low V_CE(sat)	≤ 0.3 V at rated I_C/I_B - Minimizes conduction loss and heat generation in battery-powered systems.
High h_FE	Min 82 at 5 mA/5 V - Ensures robust turn-on margin with weak drive sources such as older MCU I/Os or open-drain outputs.
Green molding compound	Halogen-free, Sb₂O₃-free - Meets IPC-1752A environmental compliance requirements for industrial and consumer shipments.
JEDEC Level 1 MSL	No bake required before reflow - Simplifies manufacturing flow and eliminates moisture-related popcorning risk.

Applications

Smartphone Keypad Interface

USB Port Status Indicator

Use Scenario: Scanning mechanical keypad matrix rows/columns in space-constrained mobile handsets.

IC Role / Device Role / Timing Role: NPN digital switch enabling row activation and column sensing with minimal external components.

Use Value: Integrated 100 kΩ R2 allows direct connection to ASIC GPIOs; low V_CE(sat) preserves battery life during extended keypress detection cycles.

Use Scenario: Driving dual-color LED indicators for USB enumeration status (connect/disconnect) on host controllers.

IC Role / Device Role / Timing Role: Low-current sink switch controlling LED anode/cathode paths in shared I/O pins.

Use Value: Guaranteed h_FE ≥ 82 ensures full LED brightness at 5 mA with 0.5 mA base drive; SOT-323 footprint saves board area near USB connectors.

IoT Sensor Node Wake-Up Circuit

Industrial PLC Input Buffer

Use Scenario: Waking ultra-low-power microcontrollers from deep sleep using external interrupt signals from motion or environmental sensors.

IC Role / Device Role / Timing Role: Signal-level translator converting sensor open-collector output to clean CMOS-compatible wake signal.

Use Value: I_EBO ≤ 58 μA at V_EB = 4 V prevents false wake-ups; –55 °C to +150 °C rating supports outdoor deployment.

Use Scenario: Isolating 24 V DC field inputs from 3.3 V logic in programmable logic controller input modules.

IC Role / Device Role / Timing Role: Level-shifting interface between industrial voltage domains and FPGA/CPLD I/O banks.

Use Value: 50 V V_CEO withstands transients on 24 V lines; R_θJA = 625 °C/W enables operation without heatsink in sealed enclosures.

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 R2 = 100 kΩ, but h_FE min = 68 (vs. 82); SOT-23 package (larger footprint, higher R_θJA = 400 °C/W)	Higher thermal resistance limits continuous current in compact layouts; lower h_FE may require increased base drive.	Select if SOT-23 handling is preferred and thermal margin exists; verify saturation at target I_C.
DXTN115TQ-7	Same R2 = 100 kΩ, h_FE min = 80, but rated for 150 mA I_C and 350 mW P_D; SOT-363 package (dual-device, 6-pin)	Higher current/power rating enables multi-channel use; dual configuration adds routing complexity.	Choose for designs needing multiple identical switches on one die; confirm layout accommodates 6-pin footprint.

Compared with NSBC115T1G and DXTN115TQ-7, DDTC115GUA-7 offers the highest guaranteed h_FE in the smallest footprint (SOT-323), making it optimal for space- and drive-limited applications where single-switch simplicity is critical.

Availability

DDTC115GUA-7 is available at Aetrix Electronics and suitable for smartphone keypad interfaces, USB status indicators, and IoT sensor node wake-up circuits requiring stable component supply and consistent parametric performance across production lots.

Supply support for DDTC115GUA-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, specializing in high-reliability, cost-optimized components for consumer, computing, industrial, and automotive markets.

The DDTC (R2-only series) UA family delivers pre-biased NPN transistors optimized for digital switching in space-constrained, low-power applications-designed to reduce design time and bill-of-materials complexity.

FAQ

What is the function of the internal 100 kΩ resistor in DDTC115GUA-7?

The internal 100 kΩ resistor (R2) connects between base and emitter, providing fixed bias to ensure reliable NPN transistor turn-on with minimal external components. It eliminates the need for an external pull-up resistor, simplifying circuit design for digital switching applications where GPIO drive strength is limited.

Can DDTC115GUA-7 replace a standard NPN transistor like 2N3904 in existing designs?

No-DDTC115GUA-7 is not a drop-in replacement for discrete transistors like 2N3904 because it integrates a base-emitter bias resistor. Using it without adjusting surrounding circuitry may cause incorrect biasing or saturation. Redesign is required to remove external bias resistors and verify drive conditions match the R2-only topology.

Is DDTC115GUA-7 suitable for linear amplifier applications?

No-DDTC115GUA-7 is characterized and qualified exclusively for digital switching operation. Its h_FE tolerance, R2 integration, and lack of linearity specifications (e.g., distortion, noise figure) make it unsuitable for analog amplification. Use dedicated small-signal amplifiers such as BC847 or MMBT3904 for linear gain stages.

What does the "-7" suffix indicate in DDTC115GUA-7?

Per Diodes Incorporated ordering conventions, the "-7" suffix denotes tape-and-reel packaging with 3,000 units per reel, compatible with automated SMT placement equipment. It also implies RoHS-compliant plating and green molding compound per date code 0627 and newer, as specified in DS30324 Rev. 7.

DDTC115GUA-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:: -

DDTC115GUA-7 FAQ

1.How can I place an order for DDTC115GUA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC115GUA-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 DDTC115GUA-7 reliable?

The price and inventory of DDTC115GUA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC115GUA-7 is usually 5 days.

3.What payment methods are accepted for DDTC115GUA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC115GUA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC115GUA-7?

DDTC115GUA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC115GUA-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 DDTC115GUA-7?

For technical support, including DDTC115GUA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC115GUA-7 requirements.

6.How does Aetrix verify that DDTC115GUA-7 is sourced from the original manufacturer or authorized distributors?

All DDTC115GUA-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 DDTC115GUA-7 meets industry standards.

7.What is the process for return or replacement of DDTC115GUA-7?

All DDTC115GUA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC115GUA-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 DDTC115GUA-7 part is unused and in its original packaging.

Return procedure for DDTC115GUA-7:

1.Submit a request within 90 days.

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

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