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Nexperia USA Inc. 2PC4081S-QX
- Part No.:
- 2PC4081S-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
2PC4081S-QX.pdf
- Description:
- TRANS NPN 50V 0.15A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
2PC4081S-QX from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT323 (SC-70) package, rated for 50 V VCEO, 150 mA IC, and DC current gain (hFE) of 270–560 at 1 mA/6 V. It serves as a low-voltage switching or small-signal amplification device in automotive body control modules, LED drivers, and sensor interface circuits.
For engineers reviewing the 2PC4081S-QX datasheet, 2PC4081S-QX pinout, 2PC4081S-QX application, or 2PC4081S-QX equivalent, key selection criteria include its AEC-Q101 qualification, SC-70 thermal resistance (625 K/W), VCE(sat) ≤ 400 mV at 50 mA/5 mA drive, and guaranteed hFE range across −55 °C to +150 °C.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching modes with base-emitter turn-on voltage ~0.7 V and transition frequency fT ≥ 100 MHz at 12 V/2 mA. Its design supports stable DC biasing and fast edge response in low-power signal paths.
The device complies with IEC 60134 absolute maximum ratings, including 60 V VCBO, 7 V VEBO, and 200 mW Ptot at Tamb ≤ 25 °C on FR4 PCB. Junction temperature is rated to 150 °C, enabling operation in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in 12 V/24 V automotive systems. |
| IC | 150 mA - Continuous collector current rating; supports driving small relays, LEDs, or logic-level interfaces without heatsinking. |
| hFE | 270–560 - DC current gain at VCE = 6 V, IC = 1 mA; ensures predictable base drive requirements across production lots and temperature. |
| VCE(sat) | ≤ 400 mV - Collector-emitter saturation voltage at IC = 50 mA, IB = 5 mA; minimizes conduction loss in switching applications. |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4 board; informs derating curves for ambient temperatures up to 105 °C. |
| fT | ≥ 100 MHz - Transition frequency at VCE = 12 V, IC = 2 mA; enables use in audio preamps and low-speed digital signal conditioning. |
| Cc | 2–3.5 pF - Collector capacitance at VCB = 12 V; limits high-frequency parasitic coupling in RF-adjacent analog stages. |
Pinout & Package
2PC4081S-QX is housed in a surface-mount SOT323 (SC-70) plastic package measuring 2.0 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch and three terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biased junction; requires current-limited drive (IB ≤ 200 mA peak) to avoid saturation delay or thermal stress. |
| 2 | Emitter (E) | Current return path; internally connected to substrate in SC-70; must be routed with low-inductance trace for switching stability. |
| 3 | Collector (C) | Output current path; electrically isolated from package tab; connects to load or next-stage input with minimal trace length for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability per stress test standard; supports PPAP documentation and zero-defect manufacturing programs. |
| Low VCE(sat) | ≤ 400 mV at 50 mA/5 mA ensures <10 mW conduction loss in always-on control nodes like door lock actuators or HVAC fan enable lines. |
| Wide temperature hFE stability | hFE remains ≥270 from −55 °C to +150 °C (Fig. 2), reducing need for temperature-compensated base bias networks. |
| Small footprint | SOT323 package enables high-density placement in space-constrained ECUs such as mirror control units or seat position sensors. |
| Low leakage | ICBO ≤ 100 nA at 25 °C and ≤5 µA at 150 °C maintains standby current integrity in battery-sensitive modules. |
Applications
| Automotive Body Control Unit | LED Indicator Driver |
|---|---|
Use Scenario: Switching 12 V incandescent or LED loads (e.g., interior dome lights, hazard flashers) controlled by microcontroller GPIO. IC Role / Device Role / Timing Role: Discrete NPN switch providing level-shifted, current-amplified drive with fast turn-on/turn-off (<1 µs propagation). Use Value: Low VCE(sat) reduces heat generation in sealed enclosures; AEC-Q101 rating ensures 15-year field reliability under thermal cycling. |
Use Scenario: Constant-current sink for status LEDs in instrument clusters or center consoles where brightness must remain stable over temperature. IC Role / Device Role / Timing Role: Linear-mode current regulator using emitter resistor feedback and fixed base bias. Use Value: Tight hFE tolerance (270–560) enables ±5% LED current accuracy without trimming; SC-70 footprint fits behind thin bezels. |
| Sensor Signal Conditioning | Microcontroller Interface Buffer |
Use Scenario: Amplifying low-level analog signals from resistive temperature sensors (RTDs) or potentiometers before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with gain set by collector/emitter resistors and hFE-stabilized bias. Use Value: fT ≥ 100 MHz supports bandwidth >10 kHz for engine coolant or cabin air temperature monitoring without phase lag. |
Use Scenario: Isolating and translating 3.3 V MCU output signals to drive 5 V logic inputs or legacy peripherals in infotainment gateways. IC Role / Device Role / Timing Role: Digital buffer with active pull-down and open-collector-compatible output stage. Use Value: Guaranteed VCE(sat) ≤ 400 mV ensures logic-low voltage stays below 0.4 V at 10 mA, meeting TTL and CMOS input thresholds. |
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 |
|---|---|---|---|
| 2PA1576S-Q | PNP complement with identical package, ratings (−50 V VECO, −150 mA IC), and AEC-Q101 qualification. | Used in complementary push-pull output stages or high-side switching where sourcing current is required. | Select when circuit topology demands matched PNP/NPN pair with identical thermal and qualification profiles. |
| BC846BW | Same SOT323 package but lower VCEO (65 V), higher hFE (110–220), no AEC-Q101 qualification, and non-automotive grade. | Suitable for industrial or consumer boards where automotive reliability and extended temperature range are not mandated. | Choose for cost-sensitive non-automotive designs requiring same footprint but without qualification overhead. |
Compared with 2PA1576S-Q, this part provides NPN polarity for low-side switching; compared with BC846BW, it adds AEC-Q101 validation and guaranteed hFE minimum, making it the only option qualified for safety-critical automotive subsystems.
Availability
2PC4081S-QX is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting control, sensor interface circuits, and microcontroller peripheral buffering requiring stable component supply and long-term lifecycle support.
Supply support for 2PC4081S-QX 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 mobile markets.
2PC4081S-QX belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust, low-cost switching and amplification in harsh automotive environments.
FAQ
Is 2PC4081S-QX pin-compatible with BC847 series transistors?
No. While both use SOT323 packages, 2PC4081S-QX has base-emitter-collector pinout (1-B, 2-E, 3-C), whereas BC847 variants follow emitter-base-collector order (1-E, 2-B, 3-C). Physical insertion into BC847 footprints will reverse polarity and cause immediate failure.
What is the maximum allowable PCB copper area for thermal relief on the emitter pad?
The datasheet specifies thermal resistance Rth(j-a) = 625 K/W assumes single-sided FR4 with standard footprint and tin-plated copper. No additional copper pour is required; adding >10 mm² of exposed copper on the emitter pad may reduce Rth(j-a) by ≤15%, but does not change derating curves unless validated per JEDEC JESD51-2.
Does 2PC4081S-QX support pulse-width modulation (PWM) dimming of LEDs?
Yes. With ton/toff < 1 µs (per typical switching curves), it supports PWM frequencies up to 500 kHz at 50 mA load. For 100 Hz–10 kHz dimming, ensure base drive current ≥5 mA and duty cycle >5% to maintain linear hFE behavior and avoid storage time delays.
Can 2PC4081S-QX replace MMBT3904 in automotive applications?
No. MMBT3904 lacks AEC-Q101 qualification, has wider hFE variation (100–300), and is rated only to 125 °C junction temperature. 2PC4081S-QX meets automotive thermal and reliability requirements that MMBT3904 does not satisfy, making substitution invalid for PPAP-compliant designs.
2PC4081S-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:
- 270 @ 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
2PC4081S-QX FAQ
1.How can I place an order for 2PC4081S-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for 2PC4081S-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 2PC4081S-QX reliable?
The price and inventory of 2PC4081S-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2PC4081S-QX is usually 5 days.
3.What payment methods are accepted for 2PC4081S-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2PC4081S-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2PC4081S-QX?
2PC4081S-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2PC4081S-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 2PC4081S-QX?
For technical support, including 2PC4081S-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2PC4081S-QX requirements.
6.How does Aetrix verify that 2PC4081S-QX is sourced from the original manufacturer or authorized distributors?
All 2PC4081S-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 2PC4081S-QX meets industry standards.
7.What is the process for return or replacement of 2PC4081S-QX?
All 2PC4081S-QX units undergo pre-shipment inspection (PSI). If there is an issue with 2PC4081S-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 2PC4081S-QX part is unused and in its original packaging.
Return procedure for 2PC4081S-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2PC4081S-QX Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
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