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

Diodes Incorporated DDTC115ECA-7

Name: DDTC115ECA-7
Brand: Diodes Incorporated
SKU: DDTC115ECA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC115ECA-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

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

Datasheet:: DDTC115ECA-7.pdf

Description:: TRANS PREBIAS NPN 50V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,912

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Product details

Overview

DDTC115ECA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT23 package, featuring integrated bias resistors R1 = R2 = 100 kΩ, AEC-Q101 qualification, 50 V V_CC, 20 mA I_O max, and 0.3 V V_CE(sat) at I_C/I_B = 10. It serves as a logic-level interface switch in automotive body control modules.

For engineers reviewing the DDTC115ECA-7 datasheet, DDTC115ECA-7 pinout, DDTC115ECA-7 application, or DDTC115ECA-7 equivalent, key selection criteria include input resistor tolerance (±30%), DC current gain (min 82), thermal resistance (625 °C/W), and AEC-Q101 compliance for automotive-grade reliability validation.

Technical Context

This device integrates two matched 100 kΩ bias resistors (R1 = R2) to configure a single-NPN transistor with fixed base biasing, eliminating external components for digital switching. Its internal topology enables direct TTL/CMOS logic-level drive without pull-up or base resistors.

Designed for high-reliability automotive applications, it operates across −55 °C to +150 °C, supports 200 mW power dissipation on FR4 PCB, and delivers V_CE(sat) ≤ 0.3 V at I_C = 5 mA and I_C/I_B = 10 - confirming low-loss switching performance under defined load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Max	50 V - supports rail voltages up to 48 V automotive systems without breakdown
R1 = R2	100 kΩ ±30% - sets fixed base bias ratio for predictable turn-on threshold at ~1.9 V
I_O Max	20 mA - drives LED indicators, small relays, or logic inputs in body electronics
V_CE(sat)	≤0.3 V at I_C/I_B = 10 - ensures <10 mW conduction loss at 5 mA load
h_FE Min	82 at V_CE = 5 V, I_C = 5 mA - guarantees sufficient current gain for stable saturation
P_D	200 mW - limits thermal rise to safe levels on standard FR4 with minimum pad layout
T_J Range	−55 °C to +150 °C - meets under-hood temperature requirements per AEC-Q101 stress testing

Pinout & Package

Package: SOT23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for current sink; connected to ground or low-side return path
2 (Base)	Input node via R1/R2 divider	Internally biased through dual 100 kΩ resistors; accepts logic-high signal directly
3 (Collector)	Output current path	Sinks up to 20 mA load to V_CC; used for driving LEDs, MOSFET gates, or optocouplers

Key Features

Feature	Design Value
Integrated R1 = R2 bias network	Eliminates two external resistors, reducing BOM count and PCB area in space-constrained modules
AEC-Q101 qualification	Validated for automotive use including temperature cycling, HTRB, and ESD robustness per stress test standards
Green compound packaging	Halogen- and antimony-free molding compound (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb) meeting RoHS 3
Low V_CE(sat)	Ensures minimal voltage drop and power loss when switching 5–20 mA loads in battery-powered nodes

Applications

Automotive Door Module

LED Status Indicator

Use Scenario: Controlling window lock/unlock solenoids and mirror position motors via microcontroller GPIO.

IC Role / Device Role / Timing Role: NPN pre-biased switch translating 3.3 V logic signals into 12 V load control paths.

Use Value: Reduces component count by replacing discrete transistor + two base resistors; maintains AEC-Q101 compliance for OEM integration.

Use Scenario: Driving multiple panel-mounted status LEDs in instrument clusters or center consoles.

IC Role / Device Role / Timing Role: Constant-current sink switch enabling uniform brightness across 20 mA LED strings.

Use Value: Delivers consistent V_CE(sat) ≤ 0.3 V across temperature, minimizing LED forward voltage variation and color shift.

Body Control Unit Input

Smart Sensor Interface

Use Scenario: Level-shifting and debouncing mechanical switch inputs (e.g., seatbelt latch, trunk release) before MCU sampling.

IC Role / Device Role / Timing Role: Digital input buffer with built-in pull-down and noise immunity via resistor-stabilized base node.

Use Value: Prevents floating inputs and false triggers without external RC networks; supports −40 °C to +125 °C ambient operation.

Use Scenario: Isolating analog sensor outputs (e.g., thermistor-based cabin temp) from noisy digital domains.

IC Role / Device Role / Timing Role: Signal conditioning switch enabling MCU ADC channel multiplexing with low leakage (<0.5 μA off-state).

Use Value: Maintains <0.5 μA I_O(off) at V_CC = 50 V, preserving sensor accuracy during sleep modes.

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
DDTC114ECA-7-F	R1 = R2 = 10 kΩ; higher input current (3.8 mA at V_IN = 5 V); lower h_FE min (30)	Better suited for faster switching with stronger drive but less efficient at ultra-low-power wake-up detection	Select when system requires faster turn-on response and can support higher base current draw
DDTC124ECA-7-F	R1 = R2 = 22 kΩ; I_O max = 30 mA; V_CE(sat) ≤ 0.3 V at I_C/I_B = 10	Higher output current capability with same saturation voltage, suitable for driving larger loads	Choose for 30 mA load applications where 20 mA limit of DDTC115ECA-7 is insufficient

Compared with DDTC114ECA-7-F and DDTC124ECA-7-F, DDTC115ECA-7 offers the highest input resistance (100 kΩ), lowest input current (0.15 mA at 5 V), and best suitability for ultra-low-power wake-up sensing - making it optimal for always-on monitoring circuits in battery-sensitive automotive subsystems.

Availability

DDTC115ECA-7 is available at Aetrix Electronics and suitable for automotive body control units, LED driver circuits, smart sensor interfaces, and door module designs requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for DDTC115ECA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTC (R1 = R2 SERIES) CA product line delivers pre-biased NPN transistors optimized for automotive and industrial digital switching applications - reducing design complexity while maintaining AEC-Q101 reliability and green packaging compliance.

FAQ

What is the maximum collector-emitter voltage rating for DDTC115ECA-7?

The absolute maximum V_CE rating is 50 V, verified per DS30329 Rev. 13–2 Absolute Maximum Ratings table. This allows safe operation in 24 V and 48 V automotive systems with margin against transients. Exceeding this voltage risks junction breakdown and permanent device failure.

Does DDTC115ECA-7 require external base resistors?

No - it integrates two 100 kΩ bias resistors (R1 = R2) internally, enabling direct connection of logic-level signals to pin 2 (base). External resistors are unnecessary unless custom biasing or dynamic control is required, which would void the pre-biased advantage.

Is DDTC115ECA-7 suitable for high-temperature under-hood applications?

Yes - it is qualified to AEC-Q101 and specified for operation from −55 °C to +150 °C junction temperature. Thermal resistance R_θJA is 625 °C/W on FR4 with minimum pad layout, allowing use in engine control proximity when power dissipation remains ≤200 mW.

How does the input resistor tolerance affect switching threshold?

R1 and R2 have ±30% tolerance, resulting in a V_IN(on) range of 1.9 V (typ) ±0.4 V. At 25 °C and V_CC = 5 V, turn-on occurs between ~1.5 V and ~2.3 V - compatible with standard CMOS logic thresholds but not recommended for precision analog threshold detection.

DDTC115ECA-7 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:: Discontinued at Digi-Key

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):: 100 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 82 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 250µA, 5mA

Current - Collector Cutoff (Max):: 500nA

Frequency - Transition:: 250 MHz

Power - Max:: 200 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

DDTC115ECA-7 FAQ

1.How can I place an order for DDTC115ECA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC115ECA-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 DDTC115ECA-7 reliable?

The price and inventory of DDTC115ECA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC115ECA-7 is usually 5 days.

3.What payment methods are accepted for DDTC115ECA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC115ECA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC115ECA-7?

DDTC115ECA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC115ECA-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 DDTC115ECA-7?

For technical support, including DDTC115ECA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC115ECA-7 requirements.

6.How does Aetrix verify that DDTC115ECA-7 is sourced from the original manufacturer or authorized distributors?

All DDTC115ECA-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 DDTC115ECA-7 meets industry standards.

7.What is the process for return or replacement of DDTC115ECA-7?

All DDTC115ECA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC115ECA-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 DDTC115ECA-7 part is unused and in its original packaging.

Return procedure for DDTC115ECA-7:

1.Submit a request within 90 days.

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

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