Diodes Incorporated DDTC115TUA-7-F

Overview

DDTC115TUA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single integrated 100 kΩ base bias resistor (R1 only), housed in a SOT323 surface-mount package. It supports 50 V V_CEO, 100 mA I_C, 200 mW power dissipation, and delivers h_FE of 100–600 at I_C = 1 mA, V_CE = 5 V - optimized for digital switching in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTC115TUA-7-F datasheet, DDTC115TUA-7-F pinout, DDTC115TUA-7-F application, or DDTC115TUA-7-F equivalent, key selection criteria include verified R1 = 100 kΩ tolerance (±30%), V_CE(sat) ≤ 0.3 V at I_C/I_B = 1 mA/0.1 mA, SOT323 thermal resistance (625 °C/W), and AEC-Q101 readiness for automotive-grade signal conditioning.

Technical Context

This device integrates a single 100 kΩ pull-up resistor between base and supply rail, eliminating external bias components for NPN digital switch operation. Its epitaxial planar die construction ensures stable h_FE across -55 °C to +150 °C and enables fast switching with f_T = 250 MHz under V_CE = 10 V, I_E = -5 mA conditions.

The SOT323 package provides low thermal resistance (625 °C/W on FR4) and supports automated placement. With 0.006 g mass and UL 94V-0 molding compound, it meets stringent reliability requirements for high-density PCBs in portable electronics and automotive body control modules.

Key Specifications

Pinout & Package

Package: SOT323 - 3-terminal plastic surface-mount package with matte tin-plated leads, moisture sensitivity level 1, and 0.006 g weight. Dimensions: D = 2.15 mm, E = 2.10 mm, e = 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSBC115T1X and DTC115EUB-7-F, DDTC115TUA-7-F offers superior h_FE consistency and lower V_CE(sat) in compact SOT323, making it optimal for high-volume, space-constrained digital switching where single-resistor simplicity and AEC-Q101 readiness are critical.

Availability

DDTC115TUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and automotive body control modules requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for DDTC115TUA-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 automotive, industrial, and consumer markets.

This part belongs to the DDTC (R1-Only Series) UA family - engineered specifically for simplified NPN digital switching in space- and cost-sensitive applications, with emphasis on AEC-Q101 qualification and green manufacturing compliance.

FAQ

What is the maximum operating temperature for DDTC115TUA-7-F?

The device operates reliably from -55 °C to +150 °C junction temperature. Its SOT323 package achieves 625 °C/W thermal resistance on FR4 boards with minimum pad layout, allowing continuous 100 mA operation up to +85 °C ambient when derated per Figure 1 in DS30323 Rev. 9-2.

Is DDTC115TUA-7-F qualified for automotive use?

Yes - Diodes Incorporated qualifies this part to AEC-Q101 standards for discrete transistors. It is manufactured in IATF 16949 certified facilities and supports PPAP documentation upon request for automotive body electronics and infotainment subsystems.

How does the R1-only bias configuration affect circuit design?

The single 100 kΩ resistor connects base to V_CC, requiring the control signal to be applied to the emitter (low-side switch) or collector (high-side with inverted logic). This simplifies layout but mandates verification of base current sufficiency - e.g., at 5 V drive, I_B ≈ 50 µA ensures I_C = 1 mA with h_FE ≥ 20.

Can DDTC115TUA-7-F replace a standard 2N3904 in digital switching applications?

Yes, with design adjustments: connect MCU GPIO to base (not emitter), tie emitter to ground, and route load between V_CC and collector. The integrated R1 eliminates the external base resistor, but V_CE(sat) remains comparable (≤0.3 V vs. 0.2 V for 2N3904), and h_FE spread is wider (100–600 vs. 100–300), requiring margin in saturation calculations.