Diodes Incorporated DDTA125TUA-7-F

Overview

DDTA125TUA-7-F from Diodes Incorporated is a PNP pre-biased transistor with single built-in bias resistor (R1 = 200 kΩ), housed in SOT323 package, rated for V_CEO = −50 V, I_C(max) = −100 mA, and h_FE = 100–600 at I_C = −1 mA, V_CE = −5 V. It enables compact, reliable switching in low-power digital interface circuits such as GPIO-driven LED drivers and logic-level translators.

For engineers reviewing the DDTA125TUA-7-F datasheet, DDTA125TUA-7-F pinout, DDTA125TUA-7-F application, or DDTA125TUA-7-F equivalent, key selection criteria include verified R1 tolerance (±30%), guaranteed V_CE(sat) ≤ −0.3 V at I_C/I_B = −0.5 mA/−0.05 mA, thermal resistance (R_θJA = 625 °C/W), and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with an integrated 200 kΩ base-emitter pull-up resistor (R1 only), eliminating external bias components in simple high-side switch configurations. Its epitaxial planar die construction ensures stable gain and leakage performance across −55 °C to +150 °C operating range.

Designed for discrete logic interfacing, it operates with fixed base current derived solely from input voltage applied to the R1-connected base terminal - no second resistor (R2) is present. The SOT323 package supports surface-mount assembly on FR4 PCBs with minimum pad layout per JEDEC standards.

Key Specifications

Pinout & Package

SOT323 three-terminal plastic package (2.15 mm × 2.10 mm × 0.95 mm), matte tin-plated leads, moisture sensitivity level 1, 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 DDTA125TUA-7-F, DDTA124TUA-7-F delivers higher base current but requires stronger input drive, while NSV12500MT1G offers tighter R1 tolerance (±20%) and smaller footprint at the cost of lower gain consistency and reduced thermal margin.

Availability

DDTA125TUA-7-F is available at Aetrix Electronics and suitable for LED driver interfaces, GPIO-level translators, and reset signal conditioners requiring stable component supply despite its obsolete status - inventory is held for legacy design continuity and repair programs.

Supply support for DDTA125TUA-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 part belongs to the DDTA R1-Only Series of pre-biased transistors, engineered specifically for simplified digital interface and low-power switching in automotive, industrial, and consumer electronics where board space and BOM count reduction are critical.

FAQ

Is DDTA125TUA-7-F still in active production?

No - Diodes Incorporated lists DDTA125TUA-7-F as Obsolete in its official ordering information table (DS30327 Rev. 7-2). However, Aetrix Electronics maintains legacy stock for design continuity, repair, and end-of-life program support. No new wafer starts are scheduled.

Can DDTA125TUA-7-F replace DDTA124TUA-7-F in existing PCBs?

No - although both share SOT323 packaging and pinout, their R1 values differ significantly (200 kΩ vs. 22 kΩ), resulting in ~9× lower base current. Substitution would cause incomplete saturation and excessive V_CE(sat) in circuits designed for DDTA124TUA-7-F's higher drive strength.

What is the maximum operating temperature for reliable switching?

The device is rated for continuous operation from −55 °C to +150 °C junction temperature. At ambient temperatures above +85 °C, derating applies: power dissipation must be reduced linearly from 200 mW at +25 °C to zero at +150 °C, per the published derating curve (Fig. 1).

Does this transistor support AEC-Q101 qualification?

Yes - the DDTA (R1-Only Series) UA family is explicitly designated for automotive applications requiring AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949 certified facilities, as stated in the datasheet's "Features" section and confirmed in Diodes' product definitions portal.