Nexperia USA Inc. PDTD123YUX

Overview

PDTD123YUX from Nexperia is an NPN resistor-equipped transistor (RET) in SOT323 (SC-70) package, designed for digital switching applications with 50 V V_CEO, 500 mA I_O, and built-in bias resistors R₁ = 2.2 kΩ and R₂ = 10 kΩ. It simplifies logic-level interface circuits by integrating base biasing, supports AEC-Q101 automotive qualification, and operates up to 175 °C ambient temperature - used in automotive body control modules for LED driver enable/disable control.

For engineers reviewing the PDTD123YUX datasheet, PDTD123YUX pinout, PDTD123YUX application, or PDTD123YUX equivalent, key selection criteria include input voltage thresholds (V_I(on) = 0.5–1.4 V, V_I(off) = 0.4–1.0 V), resistor ratio tolerance (±10 %), thermal derating on FR4 PCBs, and compatibility with 3.3 V/5 V microcontroller GPIO outputs driving inductive or resistive loads.

Technical Context

This RET integrates an NPN transistor with two monolithic silicon resistors: R₁ (2.2 kΩ) connects input to base, and R₂ (10 kΩ) connects base to emitter, enabling single-resistor external drive and eliminating discrete bias networks. Its ±10 % resistor ratio tolerance ensures predictable DC current gain (h_FE = 70 typ. at I_C = 50 mA) and stable saturation behavior (V_CE(sat) ≤ 100 mV).

Qualified to AEC-Q101, it sustains operation from −55 °C to +175 °C junction temperature, with thermal resistance R_th(j-a) = 353 K/W on 4-layer FR4 PCB. The device exhibits f_T = 225 MHz (typ.) and C_c = 7 pF, supporting high-speed digital switching while maintaining low input capacitance for clean edge response.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: 3-pin, ultra-small footprint (2.2 × 1.35 × 0.95 mm), optimized for high-density PCB layouts and reflow/wave soldering per JEDEC J-STD-020 and J-STD-006 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDTB123YU, PDTD123YUX provides complementary functionality rather than functional equivalence; compared with BC847BW, it trades off maximum h_FE for reduced component count, tighter input threshold control, and automotive-grade reliability - making it superior for cost-sensitive, high-volume digital switching where integration and qualification matter.

Availability

PDTD123YUX is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, and consumer appliance control boards requiring stable component supply, AEC-Q101 compliance, and compact SMT packaging.

Supply support for PDTD123YUX 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 high-volume, high-reliability essential semiconductors - delivering efficient, reliable, and scalable solutions for automotive, industrial, and consumer markets.

PDTD123YUX belongs to the PDTD1xxxU series of resistor-equipped transistors, engineered specifically to replace discrete BJT + resistor combinations in digital logic interfacing, reducing design complexity and improving manufacturing yield in automotive and industrial control applications.

FAQ

What is the maximum allowable input voltage (V_I) for PDTD123YUX?

The absolute maximum input voltage is +12 V (with −5 V minimum), as specified in Table 6. This rating applies with the emitter grounded and accounts for internal R₁/R₂ power dissipation limits. Operation above +12 V risks irreversible damage to the integrated resistors or transistor junction.

Can PDTD123YUX drive a 500 mA inductive load directly?

Yes - its 500 mA continuous output current rating and 100 mV V_CE(sat) allow direct drive of inductive loads up to that current, provided external flyback diode protection is used. Thermal limits require ≤300 mW total power dissipation, so sustained 500 mA operation demands adequate PCB copper area or forced airflow.

How does the R₂/R₁ ratio of 4.55 affect switching behavior?

The measured R₂/R₁ ratio of 4.55 (10 kΩ / 2.2 kΩ) sets the internal feedback strength, resulting in V_I(off) = 0.4–1.0 V and V_I(on) = 0.5–1.4 V. This narrow window ensures clean digital transitions with minimal sensitivity to supply ripple or noise, unlike standard BJTs requiring external hysteresis.

Is PDTD123YUX compatible with lead-free reflow profiles?

Yes - the SOT323 package is qualified for standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. The recommended footprint (Fig 54) uses 0.55 mm wide solder pads and 0.6 mm spacing; thermal pad grounding is not required but improves heat dissipation in high-duty-cycle applications.