Nexperia USA Inc. PDTC123EU,115

Overview

PDTC123EU from NXP Semiconductors is an NPN resistor-equipped transistor (RET) with integrated 2.2 kΩ base bias resistors (R1 and R2), designed for compact digital switching in space-constrained PCB layouts. It delivers 100 mA DC output current, supports 50 V collector-emitter voltage, and operates reliably up to 150 °C junction temperature - commonly used in logic-level interface circuits driving LEDs, relays, or small-signal MOSFET gates.

For engineers reviewing the PDTC123EU datasheet, PDTC123EU pinout, PDTC123EU application, or PDTC123EU equivalent, key selection criteria include its SOT323 (SC-70) 3-pin surface-mount package, built-in resistor ratio (R1/R2 = 1), input-on voltage of 1.6 V at 20 mA, and thermal resistance of 625 K/W in free air - all critical for low-power, high-density digital I/O buffering.

Technical Context

This device integrates two precision 2.2 kΩ resistors internally connected between base-emitter and base-collector to configure a robust digital switch with predictable turn-on/turn-off behavior. Its fixed resistor ratio (0.8–1.2) ensures stable saturation under varying drive conditions, eliminating external bias network design effort.

It functions as a single-transistor logic buffer with defined input thresholds: Vi(on) = 1.6 V (typ.) at IC = 20 mA and VCE = 0.3 V, while Vi(off) = 0.5 V (max.) at IC = 1 mA and VCE = 5 V - enabling direct interfacing with 3.3 V and 5 V CMOS/TTL outputs without level-shifting.

Key Specifications

Pinout & Package

PDTC123EU uses the SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.15 mm × 0.65 mm body, 3-lead, gull-wing terminations, rated for reflow soldering only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDTC114EU and EMD1020XUMA1, PDTC123EU offers optimal balance of drive strength (100 mA), input sensitivity (1.6 V Vi(on)), and component count reduction for unidirectional low-side switching - making it preferred for cost-sensitive, high-volume digital interface applications.

Availability

PDTC123EU is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, relay coil driving, and logic-level signal inversion requiring stable component supply and long-term manufacturability.

Supply support for PDTC123EU 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.

PDTC123EU belongs to the PDTC123E series of resistor-equipped transistors - engineered specifically to simplify digital switching in space- and cost-constrained applications by integrating precision bias networks into miniature SMT packages.

FAQ

What is the maximum allowable continuous collector current for PDTC123EU?

The PDTC123EU is rated for 100 mA DC output current under standard ambient conditions (T_amb ≤ 25 °C). Derating is required above this temperature - for example, at 70 °C ambient, maximum continuous current drops to approximately 65 mA due to its 200 mW total power dissipation limit and 625 K/W thermal resistance.

Can PDTC123EU replace a standard NPN transistor like BC847 in switching applications?

Yes, but only when the circuit relies on fixed-base biasing and does not require adjustable gain or linear amplification. PDTC123EU integrates 2.2 kΩ resistors, so it cannot substitute for discrete-transistor amplifier stages or configurations needing variable base current. It excels in digital on/off roles where simplicity and reduced part count are priorities.

Is PDTC123EU compatible with lead-free reflow soldering processes?

Yes - the datasheet explicitly states that reflow soldering is the only recommended method, and the SOT323 package is qualified for standard Pb-free reflow profiles (JEDEC J-STD-020). No special pre-bake or moisture sensitivity handling is required beyond standard MSL1 classification for this device.

Does PDTC123EU have a specified ESD rating?

No ESD rating (e.g., HBM or CDM) is published in the official NXP datasheet for PDTC123EU. While the SOT323 package provides some inherent protection, designers must implement board-level ESD safeguards - such as series resistors or TVS diodes - if the device interfaces with exposed connectors or human-accessible ports.