Diodes Incorporated DDTA115TUA-7-F

Overview

DDTA115TUA-7-F from Diodes Incorporated is a PNP pre-biased transistor with single built-in bias resistor (R1 = 100 kΩ), housed in SOT323 package, rated for V_CEO = −50 V, I_C(max) = −100 mA, and V_CE(sat) ≤ −0.3 V at I_C/I_B = −0.5 mA/−0.05 mA. It serves as an integrated switch or level translator in low-power digital interface circuits.

For engineers reviewing the DDTA115TUA-7-F datasheet, DDTA115TUA-7-F pinout, DDTA115TUA-7-F application, or DDTA115TUA-7-F equivalent, key selection criteria include its R1-only biasing topology, guaranteed h_FE range (100–600), thermal resistance (625 °C/W), automotive-grade qualification readiness, and SOT323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device integrates a PNP bipolar junction transistor with a single external-base bias resistor (R1 = 100 kΩ ±30%), eliminating discrete base-resistor placement. Its epitaxial planar construction ensures stable gain and low leakage across −55 °C to +150 °C operating range.

Designed for DC switching and signal inversion, it operates with fixed I_B derived solely from V_IN through R1-no external base drive circuitry required. The −0.3 V V_CE(sat) at light load enables efficient logic-level interfacing in 3.3 V and 5 V systems.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), moisture sensitivity level 1, matte tin-plated leads, 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 DDTA115TUA-7-F, the DDTA115TKA-7 offers superior thermal dissipation in legacy SOT-23 layouts, while NSV11501MT1G provides lower V_CE(sat) and dual-resistor biasing-making it preferable for ultra-low-voltage rail interfaces despite higher unit cost and larger die size.

Availability

DDTA115TUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O expansion, automotive switch interface modules, and industrial sensor conditioning requiring stable component supply and consistent SOT323 packaging.

Supply support for DDTA115TUA-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.

This part belongs to the DDTA R1-Only Series of pre-biased transistors, engineered to simplify digital switching designs by integrating a single base bias resistor-targeting cost-sensitive, space-constrained applications in consumer, computing, and automotive electronics.

FAQ

What is the function of the internal 100 kΩ resistor in DDTA115TUA-7-F?

The internal 100 kΩ resistor (R1) connects between the base and emitter terminals, providing fixed base bias current when voltage is applied to the base. This eliminates the need for an external resistor, enabling direct connection to logic outputs and simplifying PCB layout for low-current switching applications up to −0.5 mA base drive.

Can DDTA115TUA-7-F replace a standard PNP transistor like BC807 in existing designs?

No-DDTA115TUA-7-F is not a drop-in replacement for BC807 because it lacks a standalone base terminal; its base is internally tied to R1. To substitute, redesign the base drive network to connect input directly to the base pin (Pin 2), removing any external base resistor, and verify V_CE(sat) and switching speed meet system timing requirements.

Is DDTA115TUA-7-F qualified for automotive use?

DDTA115TUA-7-F is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes Incorporated confirms it meets all stress test requirements for automotive applications upon customer request-making it suitable for cabin electronics, body control modules, and non-safety-critical lighting systems.

How does the SOT323 package affect thermal performance in continuous operation?

With R_θJA = 625 °C/W on FR4 board, DDTA115TUA-7-F dissipates 200 mW at a 125 °C junction-to-ambient rise. At 100 mA I_C, V_CE(sat) ≈ 0.3 V yields only 30 mW power loss-keeping T_J well below 150 °C even at 70 °C ambient, provided minimum pad layout per Diodes' recommended footprint is used.