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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. 2PC4081Q-QX

Name: 2PC4081Q-QX
Brand: Nexperia USA Inc.
SKU: 2PC4081Q-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2PC4081Q-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: 2PC4081Q-QX.pdf

Description:: TRANS NPN 50V 0.15A SOT-323

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2PC4081Q-Q from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT323 (SC-70) package, rated for 50 V V_CEO, 150 mA I_C, and DC current gain (h_FE) of 120–270 at 1 mA/6 V. It serves as a compact switching and small-signal amplification device in automotive body control modules, LED drivers, and sensor interface circuits.

For engineers reviewing the 2PC4081Q-Q datasheet, 2PC4081Q-Q pinout, 2PC4081Q-Q application, or 2PC4081Q-Q equivalent, key selection criteria include its automotive qualification, low-profile SC-70 footprint, guaranteed h_FE range, V_CEsat ≤ 400 mV at 50 mA/5 mA drive, and thermal resistance of 625 K/W on FR4.

Technical Context

This discrete NPN bipolar junction transistor operates in linear and saturation regions with defined V_CEsat (≤400 mV @ IC=50 mA, IB=5 mA) and V_BEsat characteristics across −55 °C to +150 °C. Its f_T of 100 MHz supports RF-coupled pre-amplifier stages and fast-switching digital logic interfaces.

Thermal performance is specified for standard FR4 PCB mounting (single-sided copper, tin-plated), with R_th(j-a) = 625 K/W and T_j max = 150 °C. Absolute maximum ratings include V_CBO = 60 V, V_EBO = 7 V, and P_tot = 200 mW at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating voltage in 12 V/24 V automotive supply rails.
I_C	150 mA - Continuous collector current rating; supports load switching up to ~180 mW dissipation in linear mode.
h_FE	120–270 - DC current gain at V_CE = 6 V, I_C = 1 mA, T_amb = 25 °C; ensures predictable base drive sizing for saturation in digital switches.
V_CEsat	≤ 400 mV - Collector-emitter saturation voltage at I_C = 50 mA, I_B = 5 mA; enables low-loss switching in power-efficient signal routing.
f_T	100 MHz - Transition frequency at V_CE = 12 V, I_C = 2 mA; suitable for audio preamps and sub-100 MHz clock buffering.
R_th(j-a)	625 K/W - Junction-to-ambient thermal resistance on standard FR4; informs derating curves for ambient temperatures above 25 °C.

Pinout & Package

2PC4081Q-Q uses the SOT323 (SC-70) surface-mount plastic package: 3-terminal, 1.3 mm lead pitch, 2.0 mm × 1.25 mm × 0.95 mm body dimensions, optimized for high-density automotive PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal for forward-biased junction; requires current-limited drive (I_B ≤ 200 mA peak) to ensure reliable saturation.
2	Emitter (E)	Current sink node tied to reference potential; forms common-emitter configuration with grounded emitter for amplification or switching.
3	Collector (C)	Output current path; connects to load or next stage; must remain within V_CBO = 60 V and P_tot = 200 mW limits.

Key Features

Feature	Design Value
AEC-Q101 qualification	Qualified per Automotive Electronics Council stress test standard; validated for temperature cycling, HTRB, and ESD robustness in under-hood environments.
Low-profile SOT323 package	2.0 mm × 1.25 mm footprint with 0.95 mm height; enables placement in space-constrained modules like door ECUs and mirror controls.
Guaranteed h_FE range	120–270 at 1 mA/6 V/25 °C; eliminates need for binning or external gain compensation in production-grade signal conditioning.
Low V_CEsat	≤400 mV at 50 mA/5 mA; reduces conduction loss and self-heating during sustained ON-state operation in LED dimming circuits.

Applications

Automotive Body Control Unit (BCU)

LED Driver Circuit

Use Scenario: Switching 12 V loads such as interior lighting, window motors, and door locks in OEM BCU modules.

IC Role / Device Role / Timing Role: Discrete NPN switch controlling ground-side current path with logic-level base drive from MCU GPIO.

Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime; low V_CEsat minimizes heat generation in sealed enclosures.

Use Scenario: Constant-current switching for indicator LEDs and status backlighting in instrument clusters and center consoles.

IC Role / Device Role / Timing Role: Linear-mode current regulator using emitter resistor feedback, or saturated switch for PWM dimming.

Use Value: Tight h_FE range enables consistent current setting across production batches without trimming resistors.

Sensor Signal Conditioning

Industrial I/O Interface

Use Scenario: Amplifying low-level analog outputs from temperature, pressure, or position sensors before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network and bypassed emitter resistor.

Use Value: f_T = 100 MHz supports bandwidths up to ~10 MHz for fast transient response in closed-loop feedback paths.

Use Scenario: Level-shifting and isolation between 3.3 V microcontrollers and 24 V industrial fieldbus nodes (e.g., IO-Link sinks).

IC Role / Device Role / Timing Role: Digital input buffer or optocoupler driver with defined turn-on/turn-off timing via base resistor network.

Use Value: Guaranteed V_CEO = 50 V and V_CBO = 60 V provide margin against inductive kickback in relay and solenoid interfaces.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	Higher h_FE range (100–300), same SOT-23 package but larger footprint (2.9 mm × 1.3 mm); no AEC-Q101 qualification.	Not approved for automotive use; suitable for commercial-grade consumer or industrial control where qualification is not mandated.	Select when cost sensitivity outweighs automotive compliance and board space allows larger SOT-23.
BC846B,215	Same SOT323 package, AEC-Q101 qualified, but lower I_C rating (100 mA) and narrower h_FE (200–450 at 2 mA).	Optimized for low-current signal amplification rather than 150 mA switching; less margin in high-load BCU nodes.	Prefer for low-power sensor front-ends where gain consistency > current capacity.

Compared with MMBT3904LT1G and BC846B,215, the 2PC4081Q-Q uniquely balances AEC-Q101 compliance, 150 mA current capability, and SC-70 miniaturization-making it optimal for space-constrained automotive switching where both reliability and size matter.

Availability

2PC4081Q-Q is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting control, sensor interface circuits, and industrial I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for 2PC4081Q-Q 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, high-reliability discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.

The 2PC4081Q-Q belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust, miniaturized switching and amplification in harsh automotive environments.

FAQ

Is 2PC4081Q-Q suitable for automotive under-hood applications?

Yes. It is fully qualified to AEC-Q101 standards-including temperature cycling, high-temperature reverse bias, and ESD testing-and rated for T_amb from −65 °C to +150 °C. Its 150 °C T_j max and FR4 thermal data confirm suitability for engine bay and transmission control units when mounted per recommended footprint.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 200 mA, but continuous operation should limit I_B to values ensuring I_C ≤ 150 mA and P_tot ≤ 200 mW. At V_CEsat ≤ 400 mV and h_FE ≥ 120, typical design uses I_B ≈ 1.25 mA for 150 mA I_C, well within safe DC limits.

Can 2PC4081Q-Q replace BC847B in existing designs?

It can serve as a functional upgrade: both are SOT323 NPN transistors with overlapping h_FE, but 2PC4081Q-Q offers higher I_C (150 mA vs. 100 mA), AEC-Q101 qualification, and tighter V_CEsat. Pin-compatible replacement is valid if layout accommodates identical SC-70 footprint and thermal constraints are re-verified.

Does the marking "Z%Q" indicate RoHS or halogen-free compliance?

Yes. Per Nexperia's standard marking convention, "Z" denotes RoHS-compliant and halogen-free packaging. The "%" placeholder represents the manufacturing site code, and "Q" confirms AEC-Q101 qualification. Full compliance documentation is available in Nexperia's product change notices and declarations.

2PC4081Q-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 150 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 1mA, 6V

Power - Max:: 200 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

2PC4081Q-QX FAQ

1.How can I place an order for 2PC4081Q-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for 2PC4081Q-QX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2PC4081Q-QX reliable?

The price and inventory of 2PC4081Q-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2PC4081Q-QX is usually 5 days.

3.What payment methods are accepted for 2PC4081Q-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2PC4081Q-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2PC4081Q-QX?

2PC4081Q-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2PC4081Q-QX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2PC4081Q-QX?

For technical support, including 2PC4081Q-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2PC4081Q-QX requirements.

6.How does Aetrix verify that 2PC4081Q-QX is sourced from the original manufacturer or authorized distributors?

All 2PC4081Q-QX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2PC4081Q-QX meets industry standards.

7.What is the process for return or replacement of 2PC4081Q-QX?

All 2PC4081Q-QX units undergo pre-shipment inspection (PSI). If there is an issue with 2PC4081Q-QX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2PC4081Q-QX part is unused and in its original packaging.

Return procedure for 2PC4081Q-QX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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