Diodes Incorporated DDTA122TU-7

Overview

DDTA122TU-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, featuring integrated 220 Ω and open-circuit bias resistors (R1 = 220 Ω, R2 = open), −40 V V_CEO, −5 V V_EBO, and h_FE = 100–600 at I_C = −1 mA. It functions as a logic-level interface switch in low-power digital control circuits such as microcontroller GPIO drivers.

For engineers reviewing the DDTA122TU-7 datasheet, DDTA122TU-7 pinout, DDTA122TU-7 application, or DDTA122TU-7 equivalent, key selection criteria include verified V_EBO rating, confirmed R1/R2 configuration, h_FE consistency across temperature, and SOT-323 thermal derating behavior under pulsed load conditions.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with on-die base-emitter and base-collector biasing resistors-R1 connected between base and input, R2 omitted (open)-enabling single-resistor pull-up operation. Its −5 V emitter-base breakdown supports direct interfacing with 3.3 V/5 V logic families without external level-shifting.

The SOT-323 package delivers 625 °C/W junction-to-ambient thermal resistance when mounted per recommended FR4 pad layout, and its −55 °C to +150 °C operating range supports industrial ambient environments. The "Green" molding compound complies with UL 94V-0 and RoHS, with moisture sensitivity Level 1.

Key Specifications

Pinout & Package

SOT-323 (SC-70) plastic surface-mount package with gull-wing leads, 0.006 g mass, UL 94V-0 flammability rating, and matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA122TU-7, DDTA122JK-7-F adds R2 for improved noise immunity but increases input capacitance, while NSV12200MT1G provides identical electrical function plus automotive qualification-neither is pin-compatible due to differing marking and tape/reel packaging.

Availability

DDTA122TU-7 is available at Aetrix Electronics and suitable for microcontroller GPIO drivers, level-shifting interfaces, low-power sensor enable circuits, and standby mode controllers requiring stable component supply across industrial and consumer electronics programs.

Supply support for DDTA122TU-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, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTA series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface applications where board area and assembly cost reduction are critical.

FAQ

Is DDTA122TU-7 still in active production?

No-DDTA122TU-7 is officially obsolete and discontinued per Diodes Incorporated's DS30402 Rev. 7-4 (June 2021). Aetrix Electronics maintains limited legacy stock for design continuity and last-time buy support, but no future manufacturing is planned. Customers should evaluate NSV12200MT1G or DDTA122JK-7-F for new designs.

What is the exact pin configuration for DDTA122TU-7 in SOT-323?

Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector-confirmed by the schematic diagram on page 2 of DS30402. This matches standard SOT-323 PNP orientation, with emitter adjacent to the package notch or marking dot. Layout files must observe 0.65 mm nominal lead pitch and 1.2–1.4 mm body width.

Can DDTA122TU-7 replace a standard PNP transistor like BC807?

Only with circuit redesign: DDTA122TU-7 integrates R1 = 220 Ω and omits R2, so it cannot substitute for a bare transistor without removing external bias resistors. Its V_EBO = −5 V also limits base drive swing versus BC807's −6 V rating. Direct replacement risks insufficient base current or overvoltage damage.

Does DDTA122TU-7 support PWM switching above 100 kHz?

Yes-its f_T = 200 MHz and V_CE(sat) = −0.3 V at I_C = −5 mA support clean 100 kHz PWM with <5% duty-cycle distortion. However, thermal derating applies: at 85 °C ambient, max continuous I_C drops to −60 mA to stay within 200 mW P_D limit on standard FR4.