Diodes Incorporated DDTA123TUA-7-F

Overview

DDTA123TUA-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT323 package with built-in 2.2 kΩ base bias resistor (R1 only), V_CEO = −50 V, I_C(max) = −100 mA, V_CE(sat) = −0.3 V at I_C/I_B = −2.5 mA/−0.25 mA, and h_FE = 100–600. It enables compact, reliable digital switching in low-voltage logic interface circuits.

For engineers reviewing the DDTA123TUA-7-F datasheet, DDTA123TUA-7-F pinout, DDTA123TUA-7-F application, or DDTA123TUA-7-F equivalent, key selection criteria include verified R1-only biasing topology, guaranteed saturation performance under defined I_C/I_B conditions, SOT323 thermal derating behavior, and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This device implements a single-PNP bipolar junction transistor with monolithically integrated base-emitter pull-up resistor (R1 = 2.2 kΩ ±30%), eliminating external bias components. It operates as a saturated switch in DC-coupled logic-level translation and load control.

Its design targets low-power, space-constrained applications where predictable turn-on threshold and stable h_FE across −55°C to +150°C are required. The SOT323 package supports surface-mount assembly with 625°C/W junction-to-ambient thermal resistance on FR4 PCBs.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, lead-free, halogen-free, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA123TUA-7-F, DDTA123JU-7-F adds channel density at the cost of footprint size, while NSV123TUT1G extends absolute maximum ratings but requires revalidation of thermal performance in existing layouts.

Availability

DDTA123TUA-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC input stages, consumer appliance control panels, and medical patient monitor interfaces requiring stable component supply and long-term manufacturability.

Supply support for DDTA123TUA-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 North America.

This device belongs to the DDTA R1-only series of pre-biased transistors, designed specifically to reduce component count and improve reliability in digital switching and interface applications across automotive, industrial, and consumer markets.

FAQ

What is the function of the internal R1 resistor in DDTA123TUA-7-F?

The internal R1 resistor (2.2 kΩ ±30%) connects between base and emitter, forming a fixed-current bias network that allows direct connection to logic-level signals without external components. It ensures predictable turn-on behavior and eliminates resistor placement errors during assembly.

Can DDTA123TUA-7-F be used in high-frequency switching applications?

No-it is optimized for DC and low-frequency switching (≤100 kHz). Its f_T is specified at 250 MHz only for characterization; actual switching speed is limited by stored charge and package parasitics. For >1 MHz operation, dedicated RF or high-speed switching transistors are recommended.

Is DDTA123TUA-7-F qualified for automotive use?

While not individually AEC-Q101 certified, it is manufactured in IATF 16949 certified facilities and supports PPAP documentation. Customers must perform system-level qualification per AEC-Q100/101 requirements; Diodes provides change control and traceability for automotive programs.

How does the SOT323 package affect thermal performance?

With R_θJA = 625°C/W on FR4 PCB using minimum pad layout, the SOT323 limits continuous power dissipation to ~200 mW at +25°C ambient. Derating is required above 25°C-e.g., max P_D drops to ~120 mW at +70°C ambient per Fig. 1 in the datasheet.