Diodes Incorporated DDTC143FUA-7

Overview

DDTC143FUA-7 from Diodes Incorporated is a 50V NPN pre-biased transistor in SOT323 package, featuring integrated R1 = 4.7kΩ and R2 = 22kΩ bias resistors. It delivers 100mA max output current, 68 DC current gain (h_FE) at 5V/10mA, and V_CE(sat) ≤ 0.3V - optimized for low-power digital switching in space-constrained PCBs.

For engineers reviewing the DDTC143FUA-7 datasheet, DDTC143FUA-7 pinout, DDTC143FUA-7 application, or DDTC143FUA-7 equivalent, key selection criteria include input voltage threshold (1.3V @ I_OUT = 3mA), thermal resistance (625°C/W), RoHS-compliant "Green" construction, and AEC-Q101 qualification readiness for automotive signal conditioning.

Technical Context

This device integrates two precision bias resistors (R1 = 4.7kΩ ±30%, R2 = 22kΩ) to eliminate external base drive components. Its epitaxial planar die construction ensures stable gain (h_FE = 68 typ.) and fast switching with f_T = 250MHz at V_CE = 10V, I_E = 5mA.

Designed for direct logic-level interfacing, it operates with input voltage thresholds as low as 1.3V (V_IN(on)) while maintaining I_OUT(off) ≤ 0.5μA at V_CC = 50V - enabling reliable high-side or low-side switching in 3.3V/5V microcontroller I/O expansion circuits.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount outline (2.15mm × 2.10mm × 0.95mm), moisture sensitivity level 1, matte tin-plated leads solderable per MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSVD143FDT5G and EMD143FMT2G, DDTC143FUA-7 offers optimal thermal performance (625°C/W) and lowest input threshold (1.3V) for 3.3V logic systems, while maintaining smallest single-channel footprint and lowest cost per function.

Availability

DDTC143FUA-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O expander modules, and automotive door control systems requiring stable component supply and long-term lifecycle support.

Supply support for DDTC143FUA-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 centers across Asia and manufacturing in IATF 16949-certified facilities.

This part belongs to the DDTC (R1≠R2 Series) pre-biased transistor family, engineered specifically for reducing component count and improving reliability in logic-level switching applications across consumer, industrial, and automotive markets.

FAQ

What is the maximum continuous collector current for DDTC143FUA-7?

The absolute maximum collector current is 100mA, verified per the DS30322 datasheet Absolute Maximum Ratings table. This rating applies at T_amb = +25°C with proper PCB thermal relief; derating is required above +25°C per the 625°C/W R_θJA curve.

Does DDTC143FUA-7 require external base resistors?

No - it integrates R1 = 4.7kΩ (collector-to-base) and R2 = 22kΩ (base-to-emitter) internally. The base terminal (pin 2) is not externally accessible; only emitter (pin 1) and collector (pin 3) are user-connected terminals.

Is DDTC143FUA-7 qualified for automotive applications?

It is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes Incorporated confirms this part is eligible for AEC-Q101 stress testing and change-controlled automotive release upon customer request.

What is the typical input current at 3.3V supply?

At V_IN = 3.3V, the input current is 1.8mA (per Electrical Characteristics table, "Input Current" row for DDTC143FUA). This value reflects current drawn through the internal R1–R2 divider network when the transistor is active.