Diodes Incorporated DDTC115TCA-7-F

Overview

DDTC115TCA-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT23 package with a single integrated 100 kΩ bias resistor (R1 only), V_CEO = 50 V, I_C(max) = 100 mA, V_CE(sat) ≤ 0.3 V at I_C/I_B = 0.5 mA/0.05 mA, and h_FE = 100–600. It enables compact, reliable switching in low-power digital interface and level-shifting circuits.

For engineers reviewing the DDTC115TCA-7-F datasheet, DDTC115TCA-7-F pinout, DDTC115TCA-7-F application, or DDTC115TCA-7-F equivalent, key selection criteria include R1 tolerance (±30%), thermal resistance (625 °C/W), AEC-Q101 qualification status (not applicable to this variant), and compatibility with 3.3 V/5 V logic-driven loads requiring minimal external components.

Technical Context

This device implements a monolithic NPN transistor with a single on-die base bias resistor (R1 = 100 kΩ, ±30%), eliminating discrete resistor placement while maintaining predictable turn-on behavior under defined I_C/I_B conditions. Its epitaxial planar construction ensures stable gain and low leakage across -55 °C to +150 °C.

The SOT23 package supports surface-mount assembly with JEDEC-standard footprint and J-STD-020 Level 1 moisture sensitivity. Electrical performance is specified at T_A = +25 °C, with derating applied above 25 °C per the 200 mW power limit and 625 °C/W R_θJA.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated molding compound, and 0.008 g typical weight. Moisture sensitivity level: J-STD-020 Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC123TCA-7-F and DDTC144TCA-7-F, DDTC115TCA-7-F provides the highest input impedance (100 kΩ) and lowest base current demand (50 µA), making it optimal for high-impedance, low-power logic interfaces-whereas the alternatives trade impedance for gain or drive strength.

Availability

DDTC115TCA-7-F is available at Aetrix Electronics and suitable for LED indicator control, microcontroller GPIO expansion, and level-shifting applications requiring stable component supply, consistent R1 tolerance, and industrial-grade temperature operation.

Supply support for DDTC115TCA-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, consumer, and automotive markets.

This part belongs to the DDTC (R1-only series) pre-biased transistor product line, designed specifically to reduce bill-of-materials count and improve assembly yield in space-constrained digital interface circuits.

FAQ

What is the function of the internal R1 resistor in DDTC115TCA-7-F?

The internal R1 resistor (100 kΩ ±30%) connects the base to the input terminal, providing fixed bias current to saturate the NPN transistor when driven by logic-level voltages. It eliminates the need for an external base resistor, simplifying layout and improving consistency in low-current switching applications such as LED driving and GPIO buffering.

Is DDTC115TCA-7-F qualified for automotive use?

No. While the related DDTC143TCAQ-7-F variant is AEC-Q101 qualified and PPAP capable, DDTC115TCA-7-F is not automotive-qualified. It is rated for industrial temperature range (-55 °C to +150 °C) and intended for commercial and industrial applications where automotive certification is not required.

How does the SOT23 package affect thermal performance?

The SOT23 package has a thermal resistance of 625 °C/W (junction-to-ambient) when mounted on an FR4 board with minimum recommended copper pad area. This limits continuous power dissipation to 200 mW at 25 °C ambient, requiring derating above that temperature-critical for sustained 100 mA operation in enclosed or high-ambient environments.

Can DDTC115TCA-7-F replace a standard NPN transistor like BC847?

It can replace BC847 in saturated-switch applications where the 100 kΩ R1 bias matches the required base drive, but not in linear amplifier or variable-bias configurations. Unlike BC847, DDTC115TCA-7-F lacks a separate base terminal-its base is internally tied to R1-so circuit topology must accommodate fixed-bias operation and verify V_CE(sat) and switching speed meet requirements.