Diodes Incorporated DDTA124EUA-7-F

Overview

DDTA124EUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = R2 = 22 kΩ, −40 V V_IN rating, −30 mA I_O max, and DC current gain (G_L) of −56 at V_CE = −5 V, I_C = −5 mA. It functions as an inverter-level digital switch in low-power logic interface circuits.

For engineers reviewing the DDTA124EUA-7-F datasheet, DDTA124EUA-7-F pinout, DDTA124EUA-7-F application, or DDTA124EUA-7-F equivalent, key selection considerations include input voltage threshold (V_IN(on) = −1.9 to −3 V), output saturation voltage (V_O(on) = −0.1 to −0.3 V), resistor tolerance (±30%), and thermal resistance (R_θJA = 625 °C/W) for PCB layout planning.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two matched on-die base biasing resistors (R1 = R2 = 22 kΩ), enabling direct TTL/CMOS-compatible digital input drive without external bias components. Its epitaxial planar die construction ensures stable gain and leakage performance across −55 °C to +150 °C.

The internal resistor ratio (R2/R1 = 0.8–1.2) and guaranteed G_L ≥ −56 support reliable switching in 3.3 V and 5 V logic systems, while the −40 V V_IN rating allows safe operation under transient overvoltage conditions typical in industrial I/O protection.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic package (2.00–2.20 mm length, 1.15–1.35 mm width, 0.25–0.40 mm thickness), RoHS-compliant, moisture sensitivity level 1, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124EUA-7-F, DDTA124W-7-F offers improved bias precision and gain stability at marginal cost premium, while NSV124EUA-7 trades drive strength and saturation performance for lower quiescent current in battery-sensitive applications.

Availability

DDTA124EUA-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED indicator drivers, microcontroller GPIO expanders, and level-shifting logic interfaces requiring stable component supply and long-term manufacturability.

Supply support for DDTA124EUA-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, specializing in high-reliability, industry-standard components for automotive, industrial, and consumer markets.

This part belongs to the DDTA R1 = R2 series of pre-biased transistors, designed specifically to simplify digital interface design by integrating matched base resistors and delivering predictable switching performance across extended temperature ranges.

FAQ

What is the absolute maximum input voltage for DDTA124EUA-7-F?

The absolute maximum input voltage (V_IN) is −40 V, measured between pin 1 (emitter) and pin 2 (base). This rating applies under continuous DC conditions at T_A = 25 °C and ensures safe operation during transient overvoltage events in industrial I/O environments. Exceeding this value risks permanent damage to the internal base-emitter junction.

Can DDTA124EUA-7-F be used as a high-side switch?

Yes - its PNP structure and emitter-connected pin 1 allow it to function as a high-side switch when the emitter is tied to a positive rail (e.g., +5 V or +24 V) and the collector drives the load to ground. The integrated R1/R2 network provides automatic base biasing, eliminating need for external pull-up resistors in such configurations.

What is the typical input current at −5 V input voltage?

At V_I = −5 V, the typical input current (I_L) is −0.36 mA, as specified in the Electrical Characteristics table. This value reflects current drawn through the R1 resistor path and confirms low static power consumption, making the device suitable for always-on monitoring circuits with tight current budgets.

Is DDTA124EUA-7-F pin-compatible with other DDTA series variants?

Yes - all DDTA-x-xx-EUA devices share identical SOT-323 pinout (Emitter-Base-Collector on pins 1-2-3) and mechanical footprint. However, electrical parameters differ significantly: R1/R2 values range from 2.2 kΩ to 100 kΩ, and I_O ratings vary from −20 mA to −100 mA. Swapping variants requires verification of bias compatibility and load current capability.