Diodes Incorporated DDTC115GCA-7

Overview

DDTC115GCA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT-23 package, featuring a built-in 100 kΩ bias resistor (R2 only), 50 V V_CEO, 100 mA I_C(max), and h_FE = 82 at 5 mA/5 V - used for level-shifting and digital switching in compact logic interface circuits.

For engineers reviewing the DDTC115GCA-7 datasheet, DDTC115GCA-7 pinout, DDTC115GCA-7 application, or DDTC115GCA-7 equivalent, key selection criteria include verified R2-only bias topology, guaranteed h_FE ≥ 82 at standard test conditions, SOT-23 thermal resistance of 625 °C/W on FR4, and RoHS-compliant green molding compound compliance per J-STD-020D Level 1 moisture sensitivity.

Technical Context

This device implements a single-NPN transistor with integrated base-emitter pull-down resistor (R2 = 100 kΩ ±30%), eliminating external bias components in saturated-switch applications. It operates with V_CE(sat) ≤ 0.3 V at I_C = 10 mA / I_B = 0.5 mA and supports DC current gain up to 82 under 5 mA collector drive at 5 V V_CE.

The epitaxial planar die construction ensures stable gain across -55 °C to +150 °C operating range, while the SOT-23 package enables high-density placement in space-constrained PCB layouts. Its f_T = 250 MHz (at V_CE = 10 V, I_E = −5 mA) confirms suitability for low-frequency digital switching rather than RF amplification.

Key Specifications

Pinout & Package

Package: SOT-23 - surface-mount plastic case (UL 94V-0), 0.008 g weight, moisture sensitivity Level 1 per J-STD-020D, matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC115GCA-7, DDTC115ECA-7-F offers identical electrical behavior with alternate marking, while NSV11500MT1G trades guaranteed minimum h_FE for improved thermal dissipation - making the former ideal for design reuse and the latter better suited for high-temperature ambient deployments.

Availability

DDTC115GCA-7 is available at Aetrix Electronics and suitable for logic-level interface, microcontroller GPIO driver, and load switching applications requiring stable component supply, consistent R2 tolerance, and guaranteed h_FE performance across production lots.

Supply support for DDTC115GCA-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, industry-standard components for power management, signal integrity, and protection.

The DDTC R2-only series targets cost-sensitive, space-constrained digital switching applications - delivering pre-biased transistors with tightly controlled h_FE, standardized SOT-23 packaging, and green material compliance without design compromises.

FAQ

What is the function of the R2 resistor in DDTC115GCA-7?

The R2 resistor is a 100 kΩ internal base-emitter pull-down resistor that provides automatic biasing for digital switching applications. It ensures the transistor remains OFF when no drive signal is applied, eliminating the need for an external base resistor and simplifying circuit design for logic-level interfacing.

Is DDTC115GCA-7 suitable for linear amplifier use?

No - DDTC115GCA-7 is optimized for saturated switching, not linear amplification. Its R2-only bias topology lacks collector-base feedback (R1), resulting in unstable Q-point under analog bias conditions. The datasheet specifies parameters only for switching operation (e.g., V_CE(sat), h_FE at I_C = 5 mA), with no linearity or distortion data provided.

How does moisture sensitivity Level 1 affect handling and assembly?

Level 1 per J-STD-020D means DDTC115GCA-7 has unlimited floor life at ≤30 °C/60% RH and requires no dry-pack or baking prior to reflow. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during standard lead-free reflow profiles.

Can DDTC115GCA-7 replace a standard 2N3904 with external bias resistors?

Yes - it can replace a 2N3904 + 100 kΩ base resistor in digital switch applications, provided the circuit relies on saturated operation and does not require adjustable bias or linear gain control. Pin compatibility (SOT-23, E-B-C) and identical voltage/current ratings make it a direct functional substitute with reduced component count.