Diodes Incorporated DDTC115EE-7-F

Overview

DDTC115EE-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated bias resistors (R1 = R2 = 100 kΩ), designed for digital logic interface and level-shifting applications. It delivers 20 mA max output current, 0.3 V typical saturation voltage at 5 mA/0.25 mA drive, and supports input voltages up to +40 V with guaranteed turn-on above 1.9 V and turn-off below 0.5 V - used in automotive body control modules for LED driver enable logic.

For engineers reviewing the DDTC115EE-7-F datasheet, DDTC115EE-7-F pinout, DDTC115EE-7-F application, or DDTC115EE-7-F equivalent, key selection criteria include verified input resistor tolerance (±30%), DC current gain of 82 at 5 mA, thermal resistance of 833 °C/W on FR-4, and AEC-Q101 qualification readiness for automotive signal conditioning circuits.

Technical Context

This device integrates a monolithic NPN transistor with two matched 100 kΩ base bias resistors (R1 = R2) in a single SOT523 package, eliminating external bias components. Its internal resistor ratio tolerance is tightly controlled at 0.8–1.2%, enabling predictable switching thresholds across temperature.

The transistor operates with guaranteed VI(on) ≥ 1.9 V and VI(off) ≤ 0.5 V at TA = 25°C, supporting direct interfacing with 3.3 V and 5 V logic families. With fT = 250 MHz and COBO = 5 pF at VR = 5 V, it maintains fast switching performance suitable for low-power digital control signals.

Key Specifications

Pinout & Package

SOT523 surface-mount package: ultra-compact 1.6 mm × 1.6 mm footprint with 0.65 mm height, matte tin-plated leads, moisture sensitivity level 1, and UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC115EE-7-F, DDTC114EE-7-F provides stronger base drive but higher static power, while DDTC124EE-7-F offers intermediate bias strength ideal for 3.3 V systems - all share identical SOT523 footprint and thermal performance.

Availability

DDTC115EE-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input conditioning, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for DDTC115EE-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 automotive, industrial, and consumer markets.

This part belongs to the DDTC (R1 = R2 Series) EE family of pre-biased NPN transistors, engineered to simplify digital interface design by integrating matched bias resistors and ensuring consistent switching behavior across temperature and voltage ranges.

FAQ

What is the maximum allowable input voltage for DDTC115EE-7-F?

The absolute maximum input voltage (Pin 1 to Pin 2) is +40 V, as specified in the Absolute Maximum Ratings table. Operation beyond this value risks permanent damage to the internal bias resistors or transistor junction. For sustained reliability in automotive applications, design margins should limit VI to ≤36 V under worst-case transients.

Does DDTC115EE-7-F meet AEC-Q101 requirements?

DDTC115EE-7-F is manufactured in IATF 16949 certified facilities and supports PPAP documentation; however, Diodes Incorporated lists it as "for automotive applications requiring specific change control" rather than pre-qualified. Customers must initiate formal AEC-Q101 stress testing and qualification through Diodes' automotive team before deployment in safety-critical systems.

Can DDTC115EE-7-F replace a standard NPN transistor with external base resistors?

Yes - its integrated 100 kΩ R1/R2 network replicates the function of two discrete 100 kΩ resistors in classic pre-biased configuration. Layout simplification is immediate: no routing or placement of external bias components is required, and the SOT523 footprint matches common 3-pin transistor land patterns.

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

Power dissipation must be linearly derated at 180 µW/°C above 25°C ambient, based on RθJA = 833 °C/W. At 85°C ambient, maximum allowable PD drops to 39 mW. This requires careful thermal design on FR-4 boards, especially when operating near 20 mA output current for extended periods.