Diodes Incorporated DDTA144EE-7-F

Overview

DDTA144EE-7-F from Diodes Incorporated is a 50V PNP pre-biased transistor in SOT523 package with integrated bias resistors R1 = R2 = 47kΩ, designed for digital switching and level translation in low-power logic interfaces. It delivers VO(on) ≤ −0.3V at IO = −2mA, supports VIN range of +10V to −40V, and features DC current gain (Gl) of −68 at VO = −5V, IO = −5mA.

For engineers reviewing the DDTA144EE-7-F datasheet, DDTA144EE-7-F pinout, DDTA144EE-7-F application, or DDTA144EE-7-F equivalent, key selection criteria include input voltage tolerance, guaranteed saturation voltage under defined load, resistor ratio accuracy (R2/R1 = 0.8–1.2%), thermal resistance (833°C/W), and JEDEC-qualified reliability for industrial control and automotive subsystems.

Technical Context

This device integrates a PNP bipolar junction transistor with two matched 47kΩ bias resistors (R1 = R2) in a single SOT523 package, enabling direct connection to CMOS/TTL logic without external base resistors. Its internal inverter-like configuration provides predictable turn-on/off thresholds and eliminates discrete bias network design effort.

It operates as a saturated switch with guaranteed VO(on) ≤ −0.3V at IO = −2mA and Il = −0.25mA, supporting rail-to-rail input swing from +10V to −40V. The −68 DC current gain ensures stable conduction under specified load conditions while maintaining low quiescent current in off-state (IO(off) ≤ −0.5µA).

Key Specifications

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), moisture sensitivity level 1, matte tin-plated leads, 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 DDTA124EE-7-F and DDTA115EE-7-F, DDTA144EE-7-F balances input sensitivity and output drive-offering −0.25mA input current and −2mA output capability-making it ideal for general-purpose 3.3V/5V logic interfacing where moderate speed and robust saturation are required.

Availability

DDTA144EE-7-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and consumer appliance control boards requiring stable component supply and AEC-Q101-compliant reliability.

Supply support for DDTA144EE-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, energy-efficient components for industrial, automotive, and computing markets.

This part belongs to the DDTA (R1 = R2 Series) EE family of pre-biased transistors, engineered to simplify digital interface design by integrating matched bias resistors and delivering guaranteed switching performance across temperature and voltage extremes.

FAQ

What is the maximum allowable input voltage for DDTA144EE-7-F?

The absolute maximum input voltage (VIN) is +10 V to −40 V, measured between pin 1 (emitter) and pin 3 (base). This range enables compatibility with both positive logic systems and negative-rail applications such as automotive battery monitoring, where transient suppression and wide common-mode tolerance are essential.

Does DDTA144EE-7-F require external bias resistors?

No. It integrates two matched 47kΩ resistors (R1 = R2) internally, forming a complete bias network that allows direct connection to logic outputs without external components. This eliminates resistor matching errors and reduces PCB footprint by up to 20% compared to discrete transistor + resistor solutions.

Is DDTA144EE-7-F qualified for automotive use?

Yes. It is qualified to AEC-Q101 standards and manufactured in IATF 16949-certified facilities. Its JEDEC-qualified reliability, −55°C to +150°C operating range, and 833°C/W thermal resistance make it suitable for under-hood and body electronics applications requiring PPAP documentation and change control.

What is the typical saturation voltage at rated output current?

At IO = −2 mA and Il = −0.25 mA, VO(on) is typically −0.1 V and guaranteed ≤ −0.3 V. This low saturation voltage minimizes power loss in the switched path and ensures sufficient noise margin when interfacing with downstream logic inputs referenced to ground or negative rails.