Diodes Incorporated DDTC142TE-7

Overview

DDTC142TE-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package, featuring a 0.47kΩ input bias resistor (R1) and open-circuit R2 configuration. It delivers hFE = 100–600 at IC = 1mA, VCE = 5V; VCE(SAT) ≤ 0.3V at IC = 5mA/IB = 0.25mA; and BVEBO = 5V. It is AEC-Q101 qualified and used in automotive LED load switching and discrete logic interface circuits.

For engineers reviewing the DDTC142TE-7 datasheet, DDTC142TE-7 pinout, DDTC142TE-7 application, or DDTC142TE-7 equivalent, key selection criteria include its single-bias-resistor topology, 5V emitter-base breakdown rating, 100mA max output current, thermal resistance of 625°C/W, and compatibility with low-voltage digital control signals in space-constrained PCB layouts.

Technical Context

This device integrates a monolithic NPN transistor with a single external-base biasing resistor (R1 = 0.47kΩ), eliminating the need for an external pull-down resistor (R2). Its open-R2 configuration enables direct connection to open-collector or microcontroller GPIO outputs without additional passive components.

The SOT523 package supports high-density mounting and operates across –55°C to +150°C, with 150mW power dissipation and 625°C/W junction-to-ambient thermal resistance on FR-4 board. It meets AEC-Q101 stress testing for automotive under-hood applications.

Key Specifications

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic case (1.60 × 1.60 × 0.75 mm), halogen- and antimony-free, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC142TE-7, DDTC142JE-7-F adds a pull-down resistor for enhanced noise immunity but increases input current, while NSV142T1T1G offers equivalent automotive qualification with marginally lower DC gain - making DDTC142TE-7 optimal where minimal input current and maximal gain consistency are prioritized.

Availability

DDTC142TE-7 is available at Aetrix Electronics and suitable for automotive LED control, industrial PLC output stages, consumer appliance power sequencing, and medical instrument fan management requiring stable component supply and long-term lifecycle visibility.

Supply support for DDTC142TE-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The DDTC series belongs to Diodes' pre-biased transistor product line, engineered to simplify digital interface design in automotive, industrial, and consumer applications by integrating biasing networks into standard transistor packages.

FAQ

What is the function of the open R2 terminal in DDTC142TE-7?

The R2 terminal is internally unconnected (open), meaning no pull-down resistor exists between base and emitter. This allows the device to be driven directly by open-collector or microcontroller GPIO outputs without risk of contention, while relying solely on the 0.47kΩ R1 resistor for base biasing during active drive.

Can DDTC142TE-7 replace a standard NPN transistor like BC847 in a switching circuit?

Yes, but only when the driving signal is actively pulled low or high - not floating. Unlike BC847, DDTC142TE-7 includes R1, so no external base resistor is needed. However, it cannot substitute in circuits requiring adjustable base current or linear amplification due to fixed bias topology.

Is DDTC142TE-7 still in active production despite the "OBSOLETE" notice in the datasheet?

The "OBSOLETE" label in DS30404 Rev. 8 applies only to that specific document revision, not the part itself. DDTC142TE-7 remains active and supported by Diodes Incorporated, with current availability confirmed through authorized distributors and Aetrix Electronics' inventory.

What is the maximum safe operating voltage between emitter and base (V_EBO) for this device?

The absolute maximum emitter-base reverse voltage is 5 V, as specified in the Electrical Characteristics table. Exceeding this rating risks junction breakdown and permanent damage, especially during hot-swap or inductive load transients where emitter can rise above base potential.