Diodes Incorporated DDTD113EC-7-F

Overview

DDTD113EC-7-F from Diodes Incorporated is an NPN pre-biased digital transistor in SOT23 package, featuring integrated 1kΩ and 1kΩ bias resistors (R1 = R2 = 1kΩ), 500mA continuous collector current, 50V V_CBO, and 40V V_CEO. It functions as a single-stage logic-level switch in low-power interface circuits, commonly used in LED driver stages and microcontroller I/O buffering.

For engineers reviewing the DDTD113EC-7-F datasheet, DDTD113EC-7-F pinout, DDTD113EC-7-F application, or DDTD113EC-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(OFF) = 0.5V, V_IN(ON) = 3.0V at I_O = 20mA), output saturation voltage (V_CE(sat) ≤ 0.3V @ I_C = 50mA/I_B = 2.5mA), DC current gain (h_FE = 33–56), and thermal resistance (R_θJA = 500°C/W on FR4).

Technical Context

This device integrates two identical 1kΩ base biasing resistors to simplify external component count in switching applications. Its epitaxial planar construction ensures stable gain and low leakage across -55°C to +150°C operating range, with guaranteed V_CEO = 40V and I_C = 500mA absolute maximum ratings.

The internal resistor network enables direct TTL/CMOS-compatible drive without external base resistors. Input voltage thresholds are specified for reliable turn-on at 3.0V and turn-off below 0.5V, supporting robust noise immunity in industrial control signal conditioning and discrete logic interfacing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTD113EC-7-F, DDTB113EC-7-F provides complementary polarity in identical form factor, while NSVD113EWT1G offers enhanced automotive qualification and improved saturation performance-both retain the core 1kΩ/1kΩ bias architecture but serve distinct system-level requirements.

Availability

DDTD113EC-7-F is available at Aetrix Electronics and suitable for LED driver stages, microcontroller I/O buffering, and power supply enable control requiring stable component supply and long-term production continuity.

Supply support for DDTD113EC-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 components for industrial, computing, and consumer applications.

This part belongs to Diodes' DDTD series of pre-biased NPN transistors, designed specifically to reduce component count and improve board-level reliability in logic-level switching and interface applications.

FAQ

What is the maximum allowable input voltage applied to the base terminal?

The absolute maximum input voltage between pin 1 (emitter) and pin 2 (base) is -10V to +10V per the datasheet's VIN rating for DDTD113EC. Exceeding this range risks permanent damage to the internal bias resistors or emitter-base junction. This limit applies regardless of whether the device is biased or unpowered, and must be respected in both static and transient conditions.

Can DDTD113EC-7-F replace a standard 2N3904 with external base resistors?

Yes, it can functionally replace a 2N3904 with 1kΩ base resistors in low-speed switching applications, provided the design accounts for its fixed 1kΩ/1kΩ network and lower h_FE (33–56 vs. 100–300 for 2N3904). It simplifies layout but offers less gain margin and no flexibility to tune base drive strength.

Is this part qualified for automotive use?

DDTD113EC-7-F is manufactured in IATF 16949 certified facilities and supports PPAP documentation, but it is not formally AEC-Q101 qualified. For automotive applications, Diodes recommends contacting their representative to initiate qualification or selecting the AEC-Q101-certified NSVD113EWT1G alternative.

What is the thermal derating behavior above 25°C ambient?

Power dissipation must be linearly derated above 25°C at 0.5 mW/°C (based on R_θJA = 500°C/W), reaching zero at +75°C ambient on standard FR4. Derating follows the curve in Figure 1 of DS30384 Rev. 12–2, and actual performance depends strictly on PCB copper area and airflow per Diodes' recommended pad layout.