Diodes Incorporated DDTC113TUA-7

Overview

DDTC113TUA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single integrated 1 kΩ base bias resistor (R1 only), housed in a SOT323 surface-mount package. It supports switching and amplification in low-power digital logic interfaces, level translation, and LED driver stages, with V_CEO = 50 V, I_C(max) = 100 mA, and h_FE = 100–600 at I_C = 1 mA.

For engineers reviewing the DDTC113TUA-7 datasheet, DDTC113TUA-7 pinout, DDTC113TUA-7 application, or DDTC113TUA-7 equivalent, key selection criteria include its R1-only bias configuration, SOT323 thermal performance (R_θJA = 625 °C/W), guaranteed V_CE(sat) ≤ 0.3 V at I_C/I_B = 10 mA/1 mA, and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This device implements a monolithic NPN bipolar junction transistor with a single external-terminal biasing resistor (R1) connected between base and supply - no R2 feedback path. Its epitaxial planar die construction ensures stable h_FE across temperature (-55 to +150 °C) and low leakage (I_CBO, I_EBO ≤ 0.5 µA).

The SOT323 package enables high-density PCB layout and automated reflow assembly, while its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance require careful trace width and copper pour design under continuous 100 mA operation.

Key Specifications

Pinout & Package

Package: SOT323 - 3-pin ultra-small plastic surface-mount package (2.15 mm × 2.10 mm × 0.95 mm), lead-free, halogen-free, moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSV113T1T1G and DTC113ZKAT2L, DDTC113TUA-7 offers the smallest footprint (SOT323), lowest cost for R1-only switching, and optimized manufacturability for high-speed pick-and-place - making it preferred for space-constrained digital interface applications where gain precision is secondary to size and simplicity.

Availability

DDTC113TUA-7 is available at Aetrix Electronics and suitable for LED driver stages, microcontroller GPIO expansion, and automotive sensor interface circuits requiring stable component supply and RoHS-compliant sourcing.

Supply support for DDTC113TUA-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 components for automotive, industrial, and consumer markets.

The DDTC (R1-Only Series) UA product line delivers pre-biased transistors optimized for simplified digital switching in space- and cost-sensitive applications - emphasizing ease of use, AEC-Q101 readiness, and green packaging compliance.

FAQ

What is the function of the internal R1 resistor in DDTC113TUA-7?

The internal R1 resistor (1 kΩ ±30%) connects the base terminal to the input supply rail, providing fixed base current to bias the NPN transistor into saturation or active mode. This eliminates the need for an external base resistor, reducing component count and PCB area while ensuring repeatable turn-on characteristics across operating temperatures from −55 °C to +150 °C.

Can DDTC113TUA-7 be used in linear amplifier configurations?

Yes - its h_FE range of 100–600 at I_C = 1 mA and f_T = 250 MHz supports low-gain, low-noise amplification in audio preamp or sensor signal conditioning stages. However, the absence of R2 means bias point stability relies solely on external circuitry; it is primarily optimized for switching, not precision analog gain.

Is DDTC113TUA-7 qualified for automotive applications?

DDTC113TUA-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 out-of-box, Diodes Incorporated confirms this part family is designed for automotive-grade reliability and can be qualified per customer-specific change control requirements - including transient testing, temperature cycling, and humidity exposure.

How does the SOT323 package affect thermal performance?

The SOT323 package delivers a thermal resistance of R_θJA = 625 °C/W on FR4 PCB with minimum pad layout. At 100 mA and V_CE(sat) = 0.3 V, power dissipation reaches 30 mW, resulting in ~19 °C junction rise above ambient. For sustained operation near maximum ratings, additional copper pour or thermal vias are recommended to mitigate localized heating.