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

Nexperia USA Inc. PBSS4021NX,115

Name: PBSS4021NX,115
Brand: Nexperia USA Inc.
SKU: PBSS4021NX,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS4021NX,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS4021NX,115.pdf

Description:: TRANS NPN 20V 7A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS4021NX,115 from Nexperia is an AEC-Q101-qualified NPN low-V_CEsat transistor in SOT89 package, rated for 20 V V_CEO, 7 A continuous collector current, and 15 mΩ typical R_CEsat at 5 A/500 mA drive - used as a high-efficiency load switch in automotive power management and battery-powered motor control circuits.

For engineers reviewing the PBSS4021NX,115 datasheet, PBSS4021NX,115 pinout, PBSS4021NX,115 application, or PBSS4021NX,115 equivalent, this device is selected for low-loss switching where thermal performance on FR4 PCBs, precise base-drive optimization, and automotive-grade reliability are critical design requirements.

Technical Context

This NPN transistor operates with V_CEO = 20 V and supports I_C up to 7 A DC and 15 A peak (1 ms pulse), delivering h_FE = 300–400 at I_C = 8 A with low saturation voltage (110–210 mV at 7 A/350 mA). Its R_CEsat of 15–28 mΩ enables minimal conduction loss in compact power stages.

Thermal resistance varies by PCB construction: R_th(j-a) = 208 K/W (standard FR4) down to 50 K/W (ceramic PCB), while R_th(j-sp) = 20 K/W ensures robust solder-point thermal coupling. Switching times include t_on = 75 ns and t_off = 495 ns under defined 12.5 V/1 A test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage with open base; defines upper rail limit in 12 V automotive systems.
I_C	7 A - Continuous DC collector current rating; supports sustained motor/fan loads without forced cooling.
R_CEsat	15–28 mΩ - Low saturation resistance at 5 A/500 mA; reduces power loss to ≤350 mW at full load.
V_CEsat	110–210 mV - Confirmed saturation voltage at 7 A/350 mA drive; enables <1% voltage drop in 12 V supply rails.
h_FE	300–400 - High DC current gain at I_C = 8 A; allows efficient base drive with modest gate-driver current.
t_off	495 ns - Measured turn-off time under 12.5 V/1 A conditions; supports PWM switching up to ~1 MHz.
AEC-Q101	Qualified - Validated for automotive temperature range (−55 °C to +150 °C) and stress testing per discrete semiconductor standard.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, flat leads optimized for thermal pad soldering on FR4 or ceramic PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance return path; connected directly to ground plane or power return net for minimal loop inductance.
2	Collector	Main current-carrying terminal; large copper pad required for thermal dissipation (up to 2.5 W on ceramic PCB).
3	Base	Control input requiring 350 mA drive for full 7 A saturation; sensitive to ESD and requires series resistor for stability.

Key Features

Feature	Design Value
Very low V_CEsat	110–210 mV at 7 A enables >98% efficiency in 12 V load-switch applications with minimal heatsinking.
High I_C/I_CM	7 A continuous / 15 A pulsed rating supports fan, pump, and solenoid drivers without external current limiting.
High h_FE at high I_C	h_FE ≥ 300 at 8 A reduces base drive power and simplifies driver IC selection (e.g., single-channel logic-level GPIO).
AEC-Q101 qualification	Validated for automotive underhood environments including temperature cycling, humidity, and mechanical shock per Q101-009.
Optimized thermal pad layout	SOT89 collector tab designed for 6 cm² FR4 copper area or 1 cm² 4-layer board, enabling 1.5 W dissipation without derating.

Applications

Automotive Load Switch

Battery-Powered Motor Control

Use Scenario: Engine control module (ECM) output stage switching 12 V fans or fuel pumps.

IC Role / Device Role / Timing Role: NPN power switch controlling high-side or low-side current path with fast turn-on/off timing.

Use Value: 495 ns t_off and 15 mΩ R_CEsat minimize PWM losses and thermal rise during duty-cycle modulation.

Use Scenario: Portable medical device driving 24 V DC brush motors for actuator positioning.

IC Role / Device Role / Timing Role: Discrete NPN switch replacing MOSFETs where gate drive simplicity and cost are prioritized.

Use Value: 7 A I_C and 20 V V_CEO support 24 V nominal operation with headroom for load-dump transients.

USB-C Power Delivery Switch

Industrial Charging Circuit

Use Scenario: USB-C PD sink side enabling/disabling 20 V/5 A power path based on CC logic.

IC Role / Device Role / Timing Role: Low-V_CEsat NPN used in active OR-ing or reverse-polarity protection configuration.

Use Value: 110 mV V_CEsat limits voltage drop to <0.6% at 5 A, preserving PD negotiation accuracy and compliance.

Use Scenario: Smart battery charger managing charge current to Li-ion packs in industrial handheld tools.

IC Role / Device Role / Timing Role: Precision-controlled current switch regulating constant-current phase via base current feedback.

Use Value: Tight h_FE tolerance (300–400) and stable V_BEsat (0.99–1.05 V) enable ±2% current regulation without sense-resistor calibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-V_CEsat transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40201LT1G	20 V V_CEO, 4.5 A I_C, 35 mΩ R_CEsat, SOT-23 package	Lower current rating and higher R_CEsat; suitable only for sub-3 A loads	Select when board space is constrained and thermal budget allows higher conduction loss.
Diodes Incorporated DXT7050QZ-13	20 V V_CEO, 7 A I_C, 22 mΩ R_CEsat, SOT89 package, AEC-Q101 qualified	Nearly identical specs but slightly higher R_CEsat and lower h_FE (200–350)	Prefer for dual-sourcing where identical thermal footprint and pinout are required.

Compared with NSS40201LT1G, PBSS4021NX,115 delivers 56% higher current capacity and 58% lower R_CEsat; versus DXT7050QZ-13, it offers 15% lower saturation resistance and 20% higher h_FE, improving drive efficiency and thermal margin in high-duty-cycle applications.

Availability

PBSS4021NX,115 is available at Aetrix Electronics and suitable for automotive load switching, battery-powered motor control, and industrial charging circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PBSS4021NX,115 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 semiconductors for high-volume applications, with leadership in logic, discrete, and MOSFET technologies.

PBSS4021NX,115 belongs to Nexperia's Automotive-qualified low-V_CEsat transistor family, engineered specifically for energy-efficient power switching in 12 V/24 V automotive and industrial systems.

FAQ

What is the maximum allowable base current for PBSS4021NX,115?

The absolute maximum base current is 1 A per datasheet limiting values. For reliable 7 A saturation, IB = 350 mA is specified; exceeding 500 mA provides no significant V_CEsat improvement and risks thermal overstress at high ambient temperatures.

Can PBSS4021NX,115 be used in high-frequency PWM applications?

Yes - with t_on = 75 ns and t_off = 495 ns, it supports PWM frequencies up to ~1 MHz in low-duty-cycle scenarios. However, switching losses increase above 200 kHz due to finite storage time (t_s = 430 ns), requiring careful gate drive optimization.

How does PCB layout affect thermal performance?

Thermal resistance drops from 208 K/W (standard FR4) to 50 K/W (ceramic Al₂O₃) - a 4× improvement. Using a 6 cm² copper pour under the collector pad on 2-layer FR4 reduces R_th(j-a) to 83 K/W, enabling 1.5 W continuous dissipation without derating.

Is PBSS4021NX,115 pin-compatible with its PNP complement PBSS4021PX?

Yes - both share identical SOT89 pinning: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. This allows mirrored placement in complementary emitter-follower or H-bridge configurations without layout redesign.

PBSS4021NX,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 7 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 210mV @ 350mA, 7A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 4A, 2V

Power - Max:: 2.5 W

Frequency - Transition:: 115MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS4021NX,115 FAQ

1.How can I place an order for PBSS4021NX,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4021NX,115 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 PBSS4021NX,115 reliable?

The price and inventory of PBSS4021NX,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4021NX,115 is usually 5 days.

3.What payment methods are accepted for PBSS4021NX,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4021NX,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4021NX,115?

PBSS4021NX,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4021NX,115 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 PBSS4021NX,115?

For technical support, including PBSS4021NX,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4021NX,115 requirements.

6.How does Aetrix verify that PBSS4021NX,115 is sourced from the original manufacturer or authorized distributors?

All PBSS4021NX,115 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 PBSS4021NX,115 meets industry standards.

7.What is the process for return or replacement of PBSS4021NX,115?

All PBSS4021NX,115 units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4021NX,115, 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 PBSS4021NX,115 part is unused and in its original packaging.

Return procedure for PBSS4021NX,115:

1.Submit a request within 90 days.

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

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