NXP Semiconductors PDTA144EK,135

Overview

PDTA144EK from NXP Semiconductors is a PNP resistor-equipped transistor with integrated 47 kΩ base bias resistors (R1 and R2), designed for compact switching applications in space-constrained PCBs. It supports −50 V V_CEO, −100 mA DC output current, and operates in SOT346 (SC-59) surface-mount package - commonly used in level-shifting interfaces and low-power logic drivers.

For engineers reviewing the PDTA144EK datasheet, PDTA144EK pinout, PDTA144EK application, or PDTA144EK equivalent, this page delivers verified electrical parameters, validated SOT346 terminal mapping, real-world switching use cases, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The PDTA144EK integrates two precision 47 kΩ bias resistors (R1 = R2 = 47 kΩ, tolerance ±28%) directly into a monolithic PNP bipolar die, eliminating external base resistors and reducing layout complexity. Its internal resistor ratio (R2/R1 = 1.0 ±20%) ensures stable saturation behavior under varying drive conditions.

It exhibits V_CEsat ≤ −150 mV at I_C = −10 mA / I_B = −0.5 mA and h_FE ≥ 80 at V_CE = −5 V / I_C = −5 mA, enabling reliable digital on/off control without external current limiting. The device is rated for T_j up to +150 °C and requires reflow soldering only.

Key Specifications

Pinout & Package

Package: SOT346 (TO-236AB, SC-59A), plastic surface-mounted package with 3 leads; body dimensions 3.1 × 2.7 × 1.3 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDTC144EK and NSV144EKT3G, the PDTA144EK provides identical bias resistor values and SOT346 mechanical compatibility with legacy Philips/NXP designs, while offering higher thermal mass than SOT-23 alternatives - making it optimal for moderate-power, reliability-focused industrial interfaces where board real estate is less constrained than thermal budget.

Availability

PDTA144EK is available at Aetrix Electronics and suitable for logic level translation, low-power load switching, and interface circuit protection requiring stable component supply across automotive infotainment modules, industrial PLC I/O cards, and consumer appliance control boards.

Supply support for PDTA144EK 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The PDTA144EK belongs to NXP's resistor-equipped transistor (RET) product line, engineered to simplify digital interface design by integrating precision bias resistors directly onto PNP bipolar dies for robust, low-component-count switching.

FAQ

What is the maximum operating junction temperature for PDTA144EK?

The PDTA144EK has a maximum junction temperature (T_j) rating of +150 °C, as specified in the Limiting Values table. This allows reliable operation in industrial environments where ambient temperatures reach +85 °C, provided thermal resistance from junction to ambient (R_{th j-a} = 500 K/W for SOT346) is managed via adequate copper pour or airflow. The PDTA144EK must not exceed this limit to avoid permanent degradation.

Does PDTA144EK require external base resistors?

No, the PDTA144EK does not require external base resistors because it integrates both R1 and R2 (each 47 kΩ) internally between base and emitter/collector terminals. This eliminates the need for two discrete resistors in typical PNP switch configurations, simplifying schematic capture and reducing assembly steps. The internal resistor network is fully characterized in the datasheet's Characteristics section.

What is the pin configuration of PDTA144EK in the SOT346 package?

The PDTA144EK uses pin 1 for base, pin 2 for emitter, and pin 3 for collector in its SOT346 (SC-59A) package, as confirmed in the "Simplified outline, symbol and pinning" section of the official NXP datasheet. This pinout differs from SOT23 variants in the same family and must be verified against the top-marking orientation during PCB layout to prevent functional reversal.

Can PDTA144EK replace a standard PNP transistor like BC807 in existing designs?

The PDTA144EK can replace discrete PNP transistors like BC807 only if the circuit relies on external base biasing and the new design leverages the integrated 47 kΩ resistors. Direct substitution without modifying the base drive network will cause incorrect biasing or failure to saturate. The PDTA144EK is intended for new designs optimizing for component count reduction, not drop-in replacement of conventional transistors.

What is the typical input-off voltage (V_i(off)) specification for PDTA144EK?

The typical input-off voltage (V_i(off)) for PDTA144EK is −1.2 V, with a guaranteed range of −1.2 V to −0.8 V at I_C = −100 μA and V_CE = −5 V. This parameter defines the maximum input voltage at which the device remains reliably off, ensuring noise immunity in digital interface applications. It is measured with the internal R1/R2 network actively shaping the threshold behavior.