Diodes Incorporated DDTA123TUA-7

Overview

DDTA123TUA-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT323 package with single built-in bias resistor R1 = 2.2 kΩ, 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 switching in low-power logic interface and LED driver circuits.

For engineers reviewing the DDTA123TUA-7 datasheet, DDTA123TUA-7 pinout, DDTA123TUA-7 application, or DDTA123TUA-7 equivalent, key selection criteria include verified R1 tolerance (±30%), guaranteed V_CE(sat) under defined I_C/I_B conditions, h_FE range at I_C = −1 mA/V_CE = −5 V, and SOT323 thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates a single base-emitter biasing resistor (R1 only, no R2), simplifying PCB layout for discrete PNP switching where fixed current gain and predictable turn-on threshold are required. Its epitaxial planar construction ensures stable h_FE across temperature (−55°C to +150°C) and low leakage (I_CBO, I_EBO ≤ −0.5 μA).

Designed for DC-coupled digital interface applications, it operates with V_EB ≤ −5 V and delivers f_T = 250 MHz at V_CE = −10 V/I_E = −5 mA - confirming suitability for medium-speed switching up to ~10 MHz with controlled rise/fall times.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount, 3-terminal plastic package with 0.65 mm lead pitch, UL 94V-0 rated molding compound, and matte tin-plated leads compliant with MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA123TUA-7, DDTA123JU-7 offers channel density at the expense of layout compatibility, while NSV123TUT1G trades guaranteed h_FE and tighter V_CE(sat) for lower unit cost - making DDTA123TUA-7 optimal for industrial designs demanding consistent parametric performance.

Availability

DDTA123TUA-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, and consumer IoT gateway designs requiring stable component supply, AEC-Q101-aligned reliability, and RoHS 3 compliance.

Supply support for DDTA123TUA-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 targets cost-effective, space-efficient discrete switching in automotive and industrial applications, emphasizing simplified design, AEC-Q101 qualification readiness, and green packaging compliance.

FAQ

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

R1 is a 2.2 kΩ resistor connecting the base to the emitter internally. It provides automatic biasing so that applying a logic-high voltage to the base terminal turns the PNP transistor on without needing an external resistor. This simplifies circuit design and improves consistency across production units by eliminating variability from discrete resistor placement and tolerance.

Can DDTA123TUA-7 be used in automotive applications?

Yes - DDTA123TUA-7 is manufactured in IATF 16949-certified facilities and meets AEC-Q101 stress-test requirements for discrete transistors. Its −55°C to +150°C operating range, moisture sensitivity Level 1 rating, and halogen-free "Green" construction align with automotive under-dash and body-control module specifications.

How does the SOT323 package affect thermal performance?

The SOT323 package has a junction-to-ambient thermal resistance (R_θJA) of 625 °C/W when mounted on a standard FR4 PCB with minimum recommended copper pad area. This means at 100 mA collector current and 0.3 V V_CE(sat), power dissipation is ~30 mW, resulting in ~19°C junction rise above ambient - well within safe limits for continuous operation.

Is there a complementary NPN version of DDTA123TUA-7?

Yes - the DDTC123TUA-7 is the complementary NPN pre-biased transistor with identical R1 = 2.2 kΩ, SOT323 package, and matching electrical specs (V_CEO = 50 V, I_C(max) = 100 mA, V_CE(sat) ≤ 0.3 V). It is designed for use alongside DDTA123TUA-7 in push-pull or H-bridge configurations requiring matched bias networks.