Diodes Incorporated DDC143TU-7-F

Overview

DDC143TU-7-F from Diodes Incorporated is an NPN pre-biased dual small-signal transistor in SOT363 package, featuring a single integrated 4.7 kΩ input bias resistor (R1 only), 50 V V_CEO, 100 mA I_O, 0.3 V V_CE(sat) at 1 mA/0.1 mA drive, and h_FE of 100–600. It serves as a compact, space-saving logic-level interface switch in digital I/O buffering and LED driver stages.

For engineers reviewing the DDC143TU-7-F datasheet, DDC143TU-7-F pinout, DDC143TU-7-F application, or DDC143TU-7-F equivalent, key selection criteria include its R1-only bias configuration, dual-element isolation, SOT363 thermal performance (625 °C/W R_θJA), and suitability for low-power 3.3 V/5 V logic interfacing with guaranteed saturation under light load conditions.

Technical Context

This device integrates two independent NPN transistors, each with a dedicated 4.7 kΩ base-emitter pull-up resistor-no external R2-enabling direct TTL/CMOS-compatible switching without discrete bias networks. The dual topology supports isolated signal routing or mirrored load control.

It operates across –55 °C to +150 °C, meets AEC-Q101 stress testing for automotive use, and delivers 200 mW total power dissipation (150 mW per element max) on FR-4 PCBs with recommended pad layout. Its f_T of 250 MHz supports high-speed digital edge response.

Key Specifications

Pinout & Package

Package: SOT363 - 6-pin ultra-small surface-mount package with 0.65 mm lead pitch, 2.15 mm × 2.10 mm footprint, and 0.95 mm height; rated for moisture sensitivity level 1 (J-STD-020) and UL 94V-0 flammability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDC143TU-7-F, DDC114TU-7-F trades lower base current for reduced 3.3 V drive margin, while DDC123JU-7-F adds hysteresis at the cost of higher static power and non-R1-only topology-making DDC143TU-7-F optimal for simple, low-power, GPIO-direct applications.

Availability

DDC143TU-7-F is available at Aetrix Electronics and suitable for automotive interior lighting, industrial pushbutton interfaces, and microcontroller I/O expansion requiring stable component supply, AEC-Q101 qualification, and green manufacturing compliance.

Supply support for DDC143TU-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DDC series targets cost-sensitive, space-constrained digital interface applications-specifically delivering pre-biased transistor solutions that reduce external component count while maintaining AEC-Q101 and green compliance for automotive and industrial end equipment.

FAQ

What is the maximum continuous collector current per transistor in DDC143TU-7-F?

The device supports 100 mA output current (I_O) per transistor under standard test conditions (V_CC = 5 V, T_A = 25 °C). Derating applies above 25 °C ambient per the 625 °C/W R_θJA curve; at 75 °C, max I_O drops to ~60 mA to maintain junction temperature below 150 °C.

Can DDC143TU-7-F be used with 3.3 V microcontroller GPIOs without external components?

Yes-its 4.7 kΩ R1 ensures sufficient base current (≈0.7 mA at 3.3 V) to saturate the transistor with I_C/I_B = 10, achieving V_CE(sat) ≤ 0.3 V. No external resistors are needed, and the device remains fully compatible with 3.3 V logic levels per VI(on) = 1.1 V (max) specification.

Does DDC143TU-7-F have separate emitter connections for each transistor?

Yes-pins 1 (E1) and 6 (E2) are physically and electrically isolated emitters. This allows independent grounding, floating emitter configurations, or differential sensing. Unlike common-emitter dual transistors, E1 and E2 are not internally bonded and must be routed separately on PCB.

Is thermal performance affected if both transistors operate simultaneously at full load?

Yes-the 200 mW total power dissipation rating assumes both elements share the die. At full 100 mA per channel and 0.3 V V_CE(sat), combined power is 60 mW, well within limit. However, derating follows the single R_θJA value (625 °C/W), so simultaneous operation raises junction temperature proportionally-designers must verify T_J using P_D(total) × R_θJA + T_A.