Nexperia USA Inc. PDTA123TT,235

Overview

PDTA123TT from Nexperia is a PNP resistor-equipped transistor (RET) with integrated 2.2 kΩ base bias resistor, designed for digital switching applications where simplified drive circuitry and reduced component count are critical. It delivers −100 mA output current, −50 V collector-emitter voltage rating, and −150 mV saturation voltage at IC = −10 mA/IB = −0.5 mA, commonly used in microcontroller I/O load switching and level translation circuits.

For engineers reviewing the PDTA123TT datasheet, PDTA123TT pinout, PDTA123TT application, or PDTA123TT equivalent, this device serves as a cost-optimized, surface-mount alternative to discrete BJT + resistor combinations in low-power digital logic interfacing, IO expansion, and signal conditioning designs requiring predictable turn-on behavior without external bias network design.

Technical Context

This RET integrates a single 2.2 kΩ input bias resistor (R1) between base and input terminal, with R2 open - enabling direct connection to CMOS/TTL logic outputs without external pull-up or current-limiting resistors. Its PNP topology provides active-low switching control with emitter grounded configuration.

Designed for operation up to 150 °C junction temperature, it features −1 µA ICEO at VCE = −30 V and IB = 0 A, ensuring low leakage in standby states, and exhibits hFE ≥ 30 at VCE = −5 V and IC = −20 mA - supporting reliable saturation under typical microcontroller GPIO drive conditions.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact 3.0 × 1.4 × 1.1 mm body, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP resistor-equipped transistor applications.

Compared with PDTC123TT and BC857B,215, PDTA123TT uniquely combines fixed PNP RET functionality, minimal footprint, and guaranteed bias ratio - making it optimal for high-volume, cost-sensitive digital interface designs where consistent turn-on behavior and zero-resistor layout are prioritized.

Availability

PDTA123TT is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver modules, and microcontroller I/O expansion requiring stable component supply and long-term manufacturability assurance.

Supply support for PDTA123TT 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

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products business, with deep expertise in automotive, industrial, and consumer applications.

The PDTA123TT belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered specifically to replace discrete BJT + resistor combinations in digital switching applications while improving reliability and reducing assembly cost.

FAQ

What is the function of the internal resistor in PDTA123TT?

The PDTA123TT integrates a single 2.2 kΩ resistor (R1) between the input (pin 1) and base terminal, eliminating the need for an external base resistor. This allows direct connection to logic outputs, ensures predictable base current for saturation, and reduces PCB component count and layout complexity in digital switching circuits.

Can PDTA123TT be used in linear amplifier configurations?

No - PDTA123TT is optimized for digital switching operation, not analog amplification. Its fixed R1 bias network and specified hFE range (≥30 at IC = −20 mA) are intended for saturated on/off operation. For linear gain applications, discrete transistors like BC857B with externally adjustable bias are recommended.

What is the maximum allowable continuous current for PDTA123TT?

The absolute maximum continuous output current (IO) is −100 mA, as defined in the limiting values table. At this current, VCEsat remains ≤ −150 mV under specified test conditions. Derating is required above Tamb = 25 °C per the thermal resistance Rth(j-a) = 500 K/W for SOT23 package.

How does PDTA123TT differ from standard PNP transistors like BC857?

Unlike BC857, which requires an external base resistor for biasing, PDTA123TT integrates R1 = 2.2 kΩ internally. This reduces component count, improves manufacturing yield, and guarantees consistent turn-on characteristics. It also uses a smaller SOT23 footprint and is qualified for higher temperature operation (Tj up to 150 °C).