NXP Semiconductors PDTC123TM,315

Overview

PDTC123TM,315 from Nexperia is an NPN digital transistor with integrated 2.2 kΩ base resistor and 10 kΩ base-emitter resistor, configured as a single-element switch for low-side load control in 5 V logic interfacing applications. It operates with a DC current gain (h_FE) of 100 at I_C = 10 mA, V_CE = 0.3 V, supports V_CEO = 50 V, and delivers I_C = 100 mA continuous collector current.

For engineers reviewing the PDTC123TM,315 datasheet, PDTC123TM,315 pinout, PDTC123TM,315 application, or PDTC123TM,315 equivalent, key selection criteria include its built-in bias network for direct microcontroller GPIO drive, guaranteed saturation performance at 5 V logic levels, thermal resistance (R_thJ-A = 375 K/W), and SOT-23 package compatibility with high-density PCB layouts.

Technical Context

This device integrates two resistors to form a monolithic bias network that eliminates external components required for standard BJT switching. Its internal R₁ = 2.2 kΩ connects base to input, while R₂ = 10 kΩ pulls base to emitter - enabling predictable turn-on/turn-off behavior without discrete resistor placement.

The transistor is characterized for operation across −65 °C to +150 °C junction temperature range and meets AEC-Q101 stress test requirements for automotive-grade reliability. Its low V_CE(sat) ≤ 0.3 V at I_C/I_B = 10 mA/0.2 mA ensures minimal conduction loss in power-switching roles.

Key Specifications

Pinout & Package

SOT-23 surface-mount plastic package with 3-pin configuration, optimized for automated pick-and-place assembly and thermal performance on standard FR-4 PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital transistor switching applications.

Compared with PDTC114TM,315, the PDTC123TM,315 provides higher input current drive for faster turn-on in noise-immune environments; versus EMH11T2R, it enables simpler low-side layout and avoids level-shifting requirements in ground-referenced loads.

Availability

PDTC123TM,315 is available at Aetrix Electronics and suitable for automotive lighting control, industrial I/O expansion, and embedded LED indication requiring stable component supply and long-term production continuity.

Supply support for PDTC123TM,315 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 semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The PDTC series belongs to Nexperia's Automotive Logic Transistor family, engineered specifically for robust, resistor-equipped switching in harsh-environment control nodes where reliability and design simplicity are critical.

FAQ

What is the maximum operating temperature for PDTC123TM,315?

The PDTC123TM,315 has a specified junction temperature range of −65 °C to +150 °C. Its thermal resistance R_thJ-A is 375 K/W, meaning at 25 °C ambient and 250 mW power dissipation, junction temperature rises to approximately 119 °C - well within safe operating limits for automotive under-hood applications.

Can PDTC123TM,315 replace a standard 2N3904 with external bias resistors?

Yes - the PDTC123TM,315 replaces both the 2N3904 and its two external base bias resistors in low-side switching applications. Its integrated 2.2 kΩ/10 kΩ network provides identical functional behavior with improved consistency, reduced layout area, and tighter parameter tolerances than discrete resistor combinations.

Is PDTC123TM,315 compatible with 3.3 V logic inputs?

Yes - with I_B ≈ 2.3 mA at 3.3 V input (accounting for V_BE ≈ 0.7 V), the device achieves forced β > 10 and saturates fully. Measured V_CE(sat) remains ≤ 0.3 V, confirming reliable on-state performance with 3.3 V CMOS outputs without additional level shifting.

Does PDTC123TM,315 support PWM dimming of LEDs?

Yes - its typical switching times (t_on = 25 ns, t_off = 60 ns) support PWM frequencies up to 5 MHz. For standard LED dimming at 1–20 kHz, it delivers clean square-wave switching with negligible rise/fall time distortion and no shoot-through risk in multi-channel implementations.