Diodes Incorporated DDTA144VUA-7

Overview

DDTA144VUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring R1 = 47 kΩ and R2 = 10 kΩ bias resistors, −40 V input voltage range (VI(on)), −30 mA output current rating, and DC current gain (hFE) of −33 at −10 mA collector current. It functions as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA144VUA-7 datasheet, DDTA144VUA-7 pinout, DDTA144VUA-7 application, or DDTA144VUA-7 equivalent, key selection criteria include verified input voltage thresholds (−40 V VI(on)), guaranteed off-state leakage (<0.5 μA), built-in resistor ratio tolerance (±20%), and thermal resistance (625 °C/W) for surface-mount logic interfacing under ambient conditions up to +150 °C.

Technical Context

This device integrates a PNP bipolar junction transistor with two non-matching on-chip bias resistors (R1 ≠ R2), enabling direct TTL/CMOS-compatible switching without external base drive components. Its internal resistor network sets precise turn-on/off thresholds and stabilizes operating point against temperature drift.

The SOT-323 package supports high-density PCB layouts, and its epitaxial planar die construction ensures consistent gain (hFE = −33 min) and low saturation voltage (VO(on) ≤ −0.3 V) at IO = −10 mA, making it suitable for discrete logic inversion and level translation in space-constrained embedded systems.

Key Specifications

Pinout & Package

SOT-323 plastic surface-mount package with lead-free matte tin plating, UL 94V-0 flammability rating, and moisture sensitivity level 1 per J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA144VUA-7, DDTA144WUA-7 offers quicker turn-off due to higher R2, while DDTC144VUA-7 provides functional symmetry in NPN-based architectures but demands logic inversion - both require revalidation of input threshold compatibility and load drive capability.

Availability

DDTA144VUA-7 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control, consumer IoT button debounce, and medical wearable power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for DDTA144VUA-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 and manufacturing operations across Asia and the Americas.

The DDTA series targets cost-sensitive, space-constrained digital interface applications where integrated biasing improves reliability and reduces bill-of-materials complexity in consumer, industrial, and automotive electronics.

FAQ

What is the absolute maximum input voltage for DDTA144VUA-7?

The absolute maximum input voltage (VI) is −40 V, specified under test condition VO = −0.3 V and IO = −2 mA. This rating reflects the device's ability to withstand negative logic swings during transient events such as ESD or inductive kickback, provided power dissipation remains within 200 mW limits.

Can DDTA144VUA-7 replace a standard PNP BJT with external base resistors?

Yes - DDTA144VUA-7 replaces discrete PNP transistors plus two external bias resistors (47 kΩ and 10 kΩ). Its integrated R1/R2 network delivers identical DC operating point and switching behavior, eliminating layout errors and solder joint failures associated with three-component solutions.

Is DDTA144VUA-7 suitable for 5 V logic interfacing?

Yes - with VI(on) = −40 V (max), it reliably activates from 0 V input (logic high) referenced to a positive rail, making it ideal for interfacing with 3.3 V or 5 V CMOS outputs driving the base through a pull-up configuration. Input current at −5 V is −0.16 mA, ensuring minimal loading.

Does DDTA144VUA-7 have qualified AEC-Q101 automotive grade variants?

No - DDTA144VUA-7 is rated for industrial temperature range (−55 °C to +150 °C) but is not AEC-Q101 qualified. For automotive applications requiring qualification, Diodes' APxxxx series or DDTA144VUA-Q variants (if available) must be selected and validated per vehicle OEM requirements.