Diodes Incorporated DDTC115EUA-7-F

Overview

DDTC115EUA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT323 package, featuring integrated bias resistors R1 = R2 = 100 kΩ, V_IN(ON) = 1.4–3.0 V at I_O = 2 mA, I_O(MAX) = 20 mA, and DC current gain (h_FE) ≥ 82 at V_CE = 5 V. It is AEC-Q101 qualified and used for level-shifting and digital switching in automotive body control modules.

For engineers reviewing the DDTC115EUA-7-F datasheet, DDTC115EUA-7-F pinout, DDTC115EUA-7-F application, or DDTC115EUA-7-F equivalent, key selection criteria include input voltage threshold, output saturation voltage (V_CE(SAT) ≤ 0.3 V), resistor tolerance (±30%), thermal resistance (625 °C/W), and AEC-Q101 qualification status for automotive-grade reliability.

Technical Context

This device integrates two matched 100 kΩ bias resistors (R1 = R2) to configure a single-transistor inverter with fixed base biasing-eliminating external components while ensuring stable turn-on/turn-off behavior across temperature. Its V_IN(OFF) ≤ 1.1 V and V_IN(ON) ≥ 1.4 V provide clear logic-level discrimination under 3.3 V and 5 V supply rails.

The SOT323 package enables high-density placement in space-constrained PCBs, and its 200 mW power dissipation rating with 625 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C ambient when mounted on FR-4 with minimum pad layout. Gain-bandwidth product of 250 MHz confirms suitability for low-speed digital switching-not RF or analog amplification.

Key Specifications

Pinout & Package

SOT323 surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), UL 94V-0 rated, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC115EUA-7-F, DDTC114EUA-7-F offers lower input impedance for stronger drive capability but reduced noise immunity, while NSVDDTC115EUA-7F delivers identical performance with added automotive process controls and documentation rigor-making it the preferred choice for safety-critical vehicle subsystems.

Availability

DDTC115EUA-7-F is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O conditioning, and medical device status indication requiring stable component supply and AEC-Q101 compliance.

Supply support for DDTC115EUA-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 pre-biased transistor family, designed specifically to simplify digital interface design in space- and cost-constrained applications by integrating precision-matched bias resistors directly into the transistor die.

FAQ

What is the maximum continuous collector current for DDTC115EUA-7-F?

The absolute maximum continuous collector current is 20 mA, as specified in the Electrical Characteristics table under "Output Current" for DDTC115EUA. This rating applies at T_A = +25°C with proper PCB thermal relief; derating is required above 25°C ambient per the Power Dissipation vs. Ambient Temperature curve (Fig. 1).

Can DDTC115EUA-7-F be used with 3.3 V logic inputs?

Yes. With V_IN(ON) = 1.4–3.0 V and V_IN(OFF) ≤ 1.1 V, the device reliably switches on with standard 3.3 V CMOS outputs (typically 2.4–3.3 V high) while rejecting noise below ~1.1 V. Input current at 3.3 V is approximately 0.15 mA, well within drive capability of most microcontrollers.

Is the SOT323 package lead-free and RoHS compliant?

Yes. DDTC115EUA-7-F uses matte tin-plated leads and a halogen- and antimony-free green molding compound. It is fully RoHS 3 compliant (2015/863/EU), with no purposely added lead, and certified to J-STD-020 moisture sensitivity level 1.

How does the R1 = R2 configuration affect circuit behavior?

The matched 100 kΩ resistors form a Thevenin-equivalent base bias network that fixes the base voltage at ~½ V_IN, enabling predictable turn-on without external components. This eliminates resistor mismatch errors and improves batch-to-batch consistency in logic-level translation circuits, especially under temperature variation.