Diodes Incorporated ADTA144VCAQ-13

Overview

ADTA144VCAQ from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT23 package, featuring integrated 47 kΩ and 10 kΩ bias resistors, AEC-Q101 qualification for automotive use, -100 mA maximum collector current, and -50 V V_CC rating. It functions as an inverter-level switching device in low-power digital interface circuits.

For engineers reviewing the ADTA144VCAQ datasheet, ADTA144VCAQ pinout, ADTA144VCAQ application, or ADTA144VCAQ equivalent, key selection criteria include guaranteed turn-on/off thresholds (-5.0 V / -1.0 V), low saturation voltage (-0.1 V typ at -10 mA), ±30% input resistor tolerance, and IATF 16949-certified manufacturing traceability.

Technical Context

This device implements a monolithic PNP bipolar transistor with two on-die base biasing resistors (R1 = 47 kΩ, R2 = 10 kΩ) forming a fixed-voltage divider network. Its internal topology enables direct logic-level interfacing without external bias components.

It operates as a single-stage inverting switch: input applied to Pin 1 (base via R1/R2 network), emitter tied to V_CC (Pin 2), collector output at Pin 3. Guaranteed V_IN(ON) ≤ -5.0 V and V_IN(OFF) ≥ -1.0 V ensure robust noise margin in 5 V or 3.3 V CMOS/TTL-compatible systems.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount, 3-pin plastic package with 0.915 mm nominal 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 NSV144VCAQ and DXTA144VCAQ, ADTA144VCAQ offers optimal balance of automotive qualification, SMT scalability, and thermal efficiency for space-constrained 10–30 mA switching tasks-making it preferred for dashboard displays and sensor interface boards where board area and qualification alignment are critical.

Availability

ADTA144VCAQ is available at Aetrix Electronics and suitable for automotive interior lighting control, industrial PLC digital input conditioning, and consumer appliance panel indicator driving requiring stable component supply and long-term lifecycle support.

Supply support for ADTA144VCAQ 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 ADTA144VCAQ belongs to Diodes' Automotive-Grade Pre-Biased Transistor product line, engineered specifically for simplified, reliable, and qualified signal-level switching in harsh-environment electronic control units.

FAQ

What is the function of Pin 2 on the ADTA144VCAQ?

Pin 2 is the emitter terminal and serves as the V_CC connection point in its PNP common-emitter configuration. It must be connected to the most positive supply rail in the circuit (e.g., -12 V in a negative-rail system). This pin establishes the reference for both bias network operation and output saturation behavior, and is not ground or signal return.

Does ADTA144VCAQ require external bias resistors?

No. The ADTA144VCAQ integrates a 47 kΩ resistor (R1) between Pin 1 and the internal base, and a 10 kΩ resistor (R2) between the internal base and Pin 2 (emitter). These on-die resistors provide fixed base biasing, eliminating the need for external components while ensuring repeatable turn-on/turn-off thresholds across temperature and process variation.

Can ADTA144VCAQ drive a 20 mA LED directly?

Yes. With a typical V_CE(SAT) of -0.1 V at -10 mA and derated capability up to -30 mA continuous, the ADTA144VCAQ can safely sink 20 mA in pulsed or DC operation when properly heatsinked on FR-4. Its -100 mA absolute maximum rating provides headroom, and the guaranteed -5.0 V V_IN(ON) ensures reliable activation from standard logic outputs.

Is ADTA144VCAQ pin-compatible with generic SOT23 transistors?

No. While physically packaged in SOT23, ADTA144VCAQ has a proprietary pinout: Pin 1 = input (base via R1), Pin 2 = emitter (V_CC), Pin 3 = collector (output). Standard PNP transistors (e.g., MMBT3906) use Pin 1 = emitter, Pin 2 = base, Pin 3 = collector. Substitution without circuit redesign will result in non-functional or damaged operation.