Diodes Incorporated DDTA143XUA-7

Overview

DDTA143XUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package with integrated bias resistors R1 = 4.7 kΩ and R2 = 10 kΩ, designed for digital switching and level translation in low-power logic interfaces. It delivers −100 mA output current, −20 V maximum input voltage (VIN), −0.3 V typical output saturation voltage (VO(on)), and DC current gain (Gl) of −30 at −10 mA collector current.

For engineers reviewing the DDTA143XUA-7 datasheet, DDTA143XUA-7 pinout, DDTA143XUA-7 application, or DDTA143XUA-7 equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed −20 V VIN(max) rating, confirmed SOT-323 thermal resistance (RθJA = 625 °C/W), and validated −100 mA IO capability under defined test conditions.

Technical Context

This device implements a single PNP bipolar junction transistor with two non-equal on-chip base bias resistors (R1 ≠ R2), enabling direct interface with TTL/CMOS logic without external components. Its internal resistor network provides fixed current-limiting and ensures reliable turn-on/turn-off behavior across temperature.

The transistor operates as an active-low inverter switch: input applied to terminal 1 (base via R1), emitter tied to VCC (terminal 2), collector output at terminal 3. Output voltage swing is constrained by VO(on) ≤ −0.3 V and VCE(sat) performance up to −100 mA, with fT = 250 MHz confirming suitability for moderate-speed digital applications.

Key Specifications

Pinout & Package

Package: SOT-323 - surface-mount plastic case, 0.006 g weight, UL 94V-0 rated, moisture sensitivity level 1 per J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA143XUA-7, DDTA143FUA-7 offers faster turn-off at the cost of reduced input voltage noise margin, while DDTA123JUA-7 lowers required input drive strength and improves low-voltage compatibility-making each suitable for distinct logic family integration needs.

Availability

DDTA143XUA-7 is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller GPIO expansion, and industrial sensor signal conditioning requiring stable component supply and long-term production continuity.

Supply support for DDTA143XUA-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, specializing in high-reliability, energy-efficient components for industrial, computing, and consumer markets.

This part belongs to the DDTA (R1≠R2 Series) UA family of pre-biased transistors, engineered specifically for simplified digital switching in space-constrained, low-power applications where board area and BOM count reduction are critical.

FAQ

What is the exact R1 and R2 resistor configuration for DDTA143XUA-7?

DDTA143XUA-7 integrates R1 = 4.7 kΩ (±30%) between pin 1 and the internal base, and R2 = 10 kΩ (±30%) between the internal base and emitter (pin 2). This asymmetric resistor pair enables precise control of base current and turn-off characteristics without external components.

Can DDTA143XUA-7 replace a standard PNP transistor like BC807 in a switching circuit?

Yes, but only when the circuit relies on external base resistors. DDTA143XUA-7 replaces both the transistor and its bias network-so external resistors must be removed. Its fixed R1/R2 values and −20 V VIN(max) rating make it ideal for logic-level interfacing, unlike general-purpose transistors requiring custom bias design.

Is DDTA143XUA-7 suitable for automotive applications?

Yes. It is qualified for −55 °C to +150 °C operation, RoHS-compliant, and built with green molding compound meeting UL 94V-0. Its SOT-323 package and 625 °C/W thermal resistance support use in engine control modules and body electronics where ambient temperatures exceed 125 °C.

What is the maximum allowable power dissipation at 85 °C ambient?

At TA = 85 °C, derating begins at 25 °C per the datasheet's Fig. 1 curve. With Pd = 200 mW at 25 °C and RθJA = 625 °C/W, maximum dissipation drops to approximately 120 mW. This assumes mounting on FR4 with Diodes' recommended pad layout (AP02001).