Diodes Incorporated DDTA115GUA-7

Overview

DDTA115GUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor with built-in 100 kΩ bias resistor (R2 only), housed in an SOT-323 package, rated for -50 V V_CEO, -100 mA I_C, and 200 mW P_D; used in digital switching and level translation circuits in portable power management and interface logic.

For engineers reviewing the DDTA115GUA-7 datasheet, DDTA115GUA-7 pinout, DDTA115GUA-7 application, or DDTA115GUA-7 equivalent, key selection criteria include verified R2-only biasing topology, guaranteed h_FE ≥ 82 at I_C = -5 mA, V_CE(sat) ≤ -0.3 V, ESD robustness per JESD22-A114, and RoHS-compliant green molding compound.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with a single integrated base-emitter pull-up resistor (R2), eliminating external bias components in high-side switch and inverter configurations. It operates with V_EBO = -5 V, supports I_C up to -100 mA DC, and delivers f_T = 250 MHz under V_CE = -10 V, I_E = 5 mA conditions.

The SOT-323 package enables surface-mount assembly on space-constrained PCBs, with thermal resistance R_θJA = 625 °C/W on FR4 board using AP02001-recommended pad layout. Moisture sensitivity is Level 1 per J-STD-020C, and terminal plating uses matte tin over Alloy 42.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount package (2.20 × 1.35 × 0.95 mm max), UL 94V-0 rated, lead-free, green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA115GUA-7, DDTA115T-7 offers identical functionality in a smaller footprint but reduced thermal capability, while NSV11500MT1G trades gain and saturation performance for broader second-source availability in cost-sensitive consumer designs.

Availability

DDTA115GUA-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, and power rail enable switches requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for DDTA115GUA-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 and manufacturing operations across Asia and the Americas.

The DDTA (R2-only series) UA family targets cost-sensitive, space-constrained digital interface applications where simplified biasing, guaranteed gain, and green compliance are essential - especially in portable, battery-powered, and industrial control systems.

FAQ

What is the function of the internal R2 resistor in DDTA115GUA-7?

The internal R2 resistor (100 kΩ) connects the base to the emitter, forming a built-in pull-up that allows direct connection to open-drain or CMOS logic outputs without external components. It establishes predictable base current for saturation, enabling reliable switching with minimal external circuitry in high-side configurations.

Can DDTA115GUA-7 replace a standard PNP transistor like BC807 in existing designs?

No - DDTA115GUA-7 is not a drop-in replacement for non-pre-biased transistors. Its internal R2 alters biasing behavior: removing external resistors may cause unintended conduction or incomplete turn-off. Redesign is required to leverage its integrated bias architecture and verify V_CE(sat) and timing under actual load conditions.

Is DDTA115GUA-7 suitable for linear amplification applications?

No - this device is optimized for digital switching, not analog amplification. Its h_FE variation across I_C, lack of specified linearity parameters (e.g., distortion, output impedance), and R2-only biasing limit usable dynamic range. Use general-purpose PNP transistors like MMBT3906 for amplifier stages.

What does the "GUA" suffix indicate in DDTA115GUA-7?

The "GUA" suffix denotes the SOT-323 package variant with green (halogen-free) molding compound and matte tin lead finish, compliant with Diodes Inc.'s environmental policy effective from date code 0627 onward. It distinguishes this version from older non-green variants and confirms RoHS/lead-free status per JEDEC J-STD-609.