Nexperia USA Inc. 2PC4081R,115

Overview

2PC4081R from Nexperia is an NPN general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for 50 V V_CEO, 150 mA I_C, and DC current gain (h_FE) of 180–390 at 1 mA/6 V. It supports low-voltage switching and small-signal amplification in space-constrained PCB layouts.

For engineers reviewing the 2PC4081R datasheet, 2PC4081R pinout, 2PC4081R application, or 2PC4081R equivalent, key selection criteria include its SC-70 footprint compatibility, 625 K/W junction-to-ambient thermal resistance on FR4, and verified performance at T_amb = 25 °C with f_T = 100 MHz.

Technical Context

This discrete NPN transistor operates as a current-controlled switch or linear amplifier with base-emitter forward bias enabling collector current control. Its 7 V V_EBO and 60 V V_CBO define safe biasing limits, while 400 mV V_CEsat at I_C = 50 mA / I_B = 5 mA confirms low-saturation operation in digital logic interfacing.

Thermal design relies on its 200 mW P_tot rating under standard FR4 mounting, and its 2–3.5 pF C_c at 12 V ensures minimal capacitive loading in RF-coupled preamp stages up to 100 MHz transition frequency.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, optimized for high-density routing and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Compared with BC846B,215 and MMBT3904LT1G, the 2PC4081R offers tighter h_FE consistency and optimal thermal resistance per unit area in SC-70, making it preferred for miniaturized designs where 50 V/150 mA operation is sufficient.

Availability

2PC4081R is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, audio pre-amplifier stages, and power supply enable switches requiring stable component supply and consistent parametric performance.

Supply support for 2PC4081R 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 discrete and logic devices, headquartered in Nijmegen, Netherlands.

The 2PC4081R belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive, space-constrained consumer and industrial applications demanding predictable gain, low saturation voltage, and robust SMT manufacturability.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 200 mA, but for continuous DC operation, the base current must be limited such that the total power dissipation (I_B × V_BE + I_C × V_CE) stays within 200 mW. At typical V_BE ≈ 0.7 V and I_C = 100 mA, I_B should not exceed ~1.5 mA to maintain safe thermal margin on FR4.

Can the 2PC4081R replace a BC547 in existing designs?

No-BC547 uses TO-92 through-hole packaging and has higher V_CEO (45 V vs. 50 V) but significantly larger footprint and different thermal behavior. The 2PC4081R is not a drop-in replacement due to SOT323 vs. TO-92 mechanical incompatibility and differing h_FE distribution (180–390 vs. 110–800), requiring layout and bias network redesign.

Is this transistor qualified for automotive applications?

No-the 2PC4081R is explicitly designated as non-automotive in its revision history (v.7, Jan 2023). It lacks AEC-Q101 qualification, temperature cycling validation, and automotive-grade traceability. For automotive use, refer to Nexperia's 2PC4081-Q series variants with -Q suffix and full AEC-Q101 documentation.

How does ambient temperature affect its current rating?

Per the datasheet, I_C = 150 mA is specified at T_amb ≤ 25 °C. Above 25 °C, the device must be derated linearly: at 75 °C ambient, maximum continuous I_C drops to ~100 mA to maintain T_j ≤ 150 °C, based on R_th(j-a) = 625 K/W and P_tot = 200 mW limit.