Nexperia USA Inc. PDTC143ET,235

Overview

PDTC143ET from Nexperia is a 50 V, 100 mA NPN resistor-equipped transistor (RET) in SOT23 package, featuring integrated 4.7 kΩ input and feedback bias resistors (R1 = R2 = 4.7 kΩ). It functions as a single-chip digital switch for IC input control and load switching in industrial logic interfaces, with guaranteed V_CEO = 50 V, I_O = 100 mA, and V_CE(sat) ≤ 150 mV at I_C = 10 mA / I_B = 0.5 mA.

For engineers reviewing the PDTC143ET datasheet, PDTC143ET pinout, PDTC143ET application, or PDTC143ET equivalent, this part serves as a drop-in replacement for BC847-based digital switching circuits-offering simplified biasing, reduced BOM count, and validated performance across −40 °C to +100 °C ambient operation.

Technical Context

This NPN RET integrates two precision-matched on-die resistors (R1 = 4.7 kΩ, R2/R1 = 1.0 ± 0.2) to configure base biasing without external components. Its internal transistor exhibits h_FE ≥ 30 at I_C = 10 mA and V_CE = 5 V, with f_T = 230 MHz (typ.) enabling reliable high-speed digital switching up to ~10 MHz edge rates.

The device operates within absolute maximum ratings of V_CBO = 50 V, V_EBO = 10 V, and P_tot = 250 mW (T_amb ≤ 25 °C), with thermal resistance R_th(j-a) = 500 K/W on standard FR4 PCB-supporting stable operation under pulsed loads and moderate continuous duty cycles.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body. Standard footprint per Fig. 11 (reflow) and Fig. 12 (wave) in datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PDTC124ET, PDTC143ET delivers 2× higher output current and tighter input threshold control; versus BC847B, it removes bias design uncertainty and reduces assembly risk-making it optimal for high-volume, cost-sensitive digital switching where reliability and repeatability are prioritized.

Availability

PDTC143ET is available at Aetrix Electronics and suitable for industrial digital control, MCU peripheral switching, LED interface, and BC847 replacement applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for PDTC143ET 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions optimized for efficiency, miniaturization, and manufacturability in high-volume electronics.

PDTC143ET belongs to Nexperia's Resistor-Equipped Transistor (RET) family-designed specifically to simplify digital interface design by integrating precision bias networks into standard SOT23 packages for industrial and consumer control systems.

FAQ

What is the maximum continuous collector current for PDTC143ET?

The PDTC143ET is rated for 100 mA continuous output current (I_O) under standard conditions (T_amb ≤ 25 °C, FR4 PCB). Derating applies above 25 °C per Fig. 1: at 75 °C ambient, maximum sustainable I_O drops to ~60 mA to maintain junction temperature ≤ 150 °C.

Can PDTC143ET replace BC847 in existing designs without layout changes?

Yes-PDTC143ET uses the same SOT23 package and pinout (1=base, 2=emitter, 3=collector) as BC847. Its integrated R1/R2 eliminates the external base resistor, allowing direct substitution in digital switching roles. No PCB modification is needed, though verify V_I(on) compatibility with your logic family's high-level voltage.

What is the typical transition frequency (f_T) and its design implication?

The internal transistor has f_T = 230 MHz (typ.) at V_CE = 5 V, I_C = 10 mA. This supports clean switching of digital signals with rise/fall times < 1.5 ns-enabling reliable operation in 10 MHz clocked logic interfaces, such as address/data strobes or enable signals in industrial controllers.

How does the R2/R1 ratio affect switching behavior?

The R2/R1 ratio of 1.0 ± 0.2 ensures stable feedback from collector to base, improving saturation depth and reducing sensitivity to h_FE variation. This yields consistent V_CE(sat) ≤ 150 mV and sharp turn-off characteristics-critical for minimizing power loss and crosstalk in dense digital PCB layouts.