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

Nexperia USA Inc. PBSS4021NT,215

Name: PBSS4021NT,215
Brand: Nexperia USA Inc.
SKU: PBSS4021NT,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS4021NT,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PBSS4021NT,215.pdf

Description:: TRANS NPN 20V 4.3A TO-236AB

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Product details

Overview

PBSS4021NT,215 from Nexperia is an AEC-Q101-qualified NPN low-V_CEsat transistor in SOT23 package, rated for 20 V V_CEO, 4.3 A continuous collector current, and 32.5 mΩ typical R_CEsat. It serves as a high-efficiency load switch in automotive power management circuits where thermal performance and board space are constrained.

For engineers reviewing the PBSS4021NT,215 datasheet, PBSS4021NT,215 pinout, PBSS4021NT,215 application, or PBSS4021NT,215 equivalent, key selection criteria include its 130–200 mV V_CEsat at 4 A/400 mA drive, AEC-Q101 qualification, SOT23 footprint compatibility, and thermal resistance down to 115 K/W on ceramic PCB.

Technical Context

This device operates as a saturated-switching NPN transistor with base-driven control logic, optimized for low-loss conduction in DC load switching applications. Its design emphasizes minimal V_CEsat across wide temperature range (−55 °C to 150 °C) and high h_FE (100–300) at IC = 6 A, enabling efficient drive with modest base current.

Thermal behavior is defined by five distinct R_th(j-a) values (115–320 K/W) depending on PCB construction, and transient impedance curves support pulse-width and duty-cycle validation. Switching times (t_on = 50 ns, t_off = 425 ns) are characterized under standardized 12.5 V/1 A test conditions with ±50 mA base drive.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating voltage headroom in 12 V automotive systems.
I_C	4.3 A - Continuous DC collector current rating; supports motor/fan drivers and battery charging switches without forced cooling.
V_CEsat	130–200 mV @ IC = 4 A, IB = 400 mA - Low saturation voltage reduces conduction loss and self-heating in high-current switching paths.
R_CEsat	32.5–50 mΩ @ IC = 4 A, IB = 400 mA - Enables precise power loss calculation (P = I² × R) for thermal design in compact layouts.
h_FE	100–300 @ IC = 6 A - High DC current gain allows robust switching with low base drive current, reducing MCU GPIO loading.
t_off	425 ns - Fast turn-off time minimizes switching losses in PWM-controlled loads up to ~1 MHz effective frequency.
AEC-Q101	Qualified - Meets automotive stress-test requirements for temperature cycling, humidity, and mechanical shock; suitable for under-hood use.

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), thermally enhanced for FR4 and ceramic PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Control input terminal; requires ≥400 mA pulsed drive to achieve specified R_CEsat; connected to microcontroller GPIO or driver stage.
2 (E)	Emitter	Reference node for collector current path; tied to system ground or low-side return; forms common emitter configuration.
3 (C)	Collector	High-current output terminal; connects to load (e.g., motor, LED string, battery charge path); thermally coupled to PCB copper pour.

Key Features

Feature	Design Value
Low V_CEsat	130–200 mV enables ≤0.8 W conduction loss at 4 A, reducing heatsink need in space-constrained modules.
High I_C capability	4.3 A continuous rating supports direct driving of 5 W–10 W loads (e.g., cooling fans, solenoids) without external MOSFET buffering.
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, ESD, and accelerated life testing per JESD22 standards.
Small SOT23 footprint	2.9 mm × 1.3 mm area saves >40% board space vs. TO-236 or SC-70 equivalents while maintaining thermal performance.
High h_FE at high current	h_FE ≥100 at IC = 6 A ensures stable saturation with standard 5 V logic-level base drive, simplifying gate-driver design.

Applications

Automotive Load Switch

Battery Charging Control

Use Scenario: Controlling power to auxiliary lighting or infotainment peripherals in 12 V vehicle electrical systems.

IC Role / Device Role / Timing Role: NPN low-side switch turning on/off load current under MCU command with fast edge control.

Use Value: 130–200 mV V_CEsat limits power dissipation to <0.8 W at 4 A, eliminating need for heatsinks in dashboard modules.

Use Scenario: Enabling/disabling charging current path between USB-PD source and Li-ion battery pack in portable automotive accessories.

IC Role / Device Role / Timing Role: Precision current-path switch activated during charge enable phase; handles up to 4.3 A continuous charge current.

Use Value: 32.5 mΩ R_CEsat ensures <0.06 V drop at 2 A, preserving voltage headroom for accurate battery voltage sensing.

Motor/Fan Driver

Power Management Subsystem

Use Scenario: Driving brushed DC cooling fans or small pumps in engine control units or HVAC modules.

IC Role / Device Role / Timing Role: High-current saturated switch modulated via PWM to regulate fan speed; base driven by dedicated driver IC.

Use Value: 425 ns t_off supports PWM frequencies up to 1 MHz, enabling fine-grained speed resolution without excessive switching loss.

Use Scenario: Managing power distribution to sub-circuits (e.g., sensor clusters, CAN transceivers) in ADAS domain controllers.

IC Role / Device Role / Timing Role: Programmable power rail switch controlled by system PMIC or safety MCU; provides fault-isolated supply enable.

Use Value: AEC-Q101 qualification and 150 °C T_j rating ensure reliable operation in high-ambient under-hood environments.

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 A I_C, 180–250 mV V_CEsat @ 4 A - higher saturation voltage than PBSS4021NT's 130–200 mV.	Same SOT23 footprint but lower thermal efficiency; less suitable for high-duty-cycle fan control.	Select when cost sensitivity outweighs thermal performance; verify base drive capability for higher V_CEsat.
Diodes Incorporated DXTN20020CTR	20 V V_CEO, 4.5 A I_C, 150–220 mV V_CEsat @ 4 A - slightly higher V_CEsat, not AEC-Q101 qualified.	Lacks automotive qualification; limited to industrial/commercial power switches only.	Choose for non-automotive designs requiring marginally higher I_C; avoid in safety-critical or temperature-cycled environments.

Compared with NSS40201LT1G and DXTN20020CTR, PBSS4021NT delivers the lowest V_CEsat and certified AEC-Q101 reliability, making it optimal for thermally constrained automotive load switching where conduction loss and qualification compliance are primary selection drivers.

Availability

PBSS4021NT,215 is available at Aetrix Electronics and suitable for automotive load switching, battery charging control, and motor/fan driver applications requiring stable component supply, AEC-Q101 compliance, and high-current SOT23 packaging.

Supply support for PBSS4021NT,215 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, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

PBSS4021NT belongs to Nexperia's Automotive Logic and Discrete portfolio, engineered specifically for high-efficiency, space-constrained power switching in automotive subsystems where low V_CEsat and AEC-Q101 qualification are mandatory.

FAQ

What is the maximum allowable junction temperature for PBSS4021NT,215?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in the Limiting Values table. Operation beyond this temperature risks permanent degradation of h_FE and increased leakage currents. Thermal design must ensure T_j remains below 150 °C under worst-case ambient and power dissipation conditions, using the appropriate R_th(j-a) value for the actual PCB layout.

Is PBSS4021NT,215 pin-compatible with its PNP complement PBSS4021PT,215?

Yes - both devices share identical SOT23 pinning: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. However, polarity differs: PBSS4021NT is NPN (emitter grounded, collector switched), while PBSS4021PT is PNP (emitter tied to supply, collector switched). Layout reuse is possible, but biasing and drive logic must be inverted.

What base current is required to achieve full saturation at 4 A collector current?

Per the datasheet, 400 mA of pulsed base current (IB = 400 mA) is specified to achieve V_CEsat = 130–200 mV at IC = 4 A. This corresponds to an overdrive ratio (IC/IB) of 10, ensuring deep saturation and minimizing dependence on h_FE variation across temperature and unit-to-unit spread.

Does PBSS4021NT,215 support reflow soldering per JEDEC J-STD-020?

Yes - the SOT23 package is qualified for lead-free reflow soldering per JEDEC J-STD-020D. The recommended peak temperature is 260 °C, with a maximum time above 217 °C of 60–150 seconds. Figure 20 in the datasheet provides the exact solder land pattern (0.6 mm × 0.7 mm pads, 0.5 mm spacing) for optimal thermal and mechanical reliability.

PBSS4021NT,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 4.3 A

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

Vce Saturation (Max) @ Ib, Ic:: 200mV @ 400mA, 4A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 2A, 2V

Power - Max:: 1.1 W

Frequency - Transition:: 165MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PBSS4021NT,215 FAQ

1.How can I place an order for PBSS4021NT,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4021NT,215 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 PBSS4021NT,215 reliable?

The price and inventory of PBSS4021NT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4021NT,215 is usually 5 days.

3.What payment methods are accepted for PBSS4021NT,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4021NT,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4021NT,215?

PBSS4021NT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4021NT,215 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 PBSS4021NT,215?

For technical support, including PBSS4021NT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4021NT,215 requirements.

6.How does Aetrix verify that PBSS4021NT,215 is sourced from the original manufacturer or authorized distributors?

All PBSS4021NT,215 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 PBSS4021NT,215 meets industry standards.

7.What is the process for return or replacement of PBSS4021NT,215?

All PBSS4021NT,215 units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4021NT,215, 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 PBSS4021NT,215 part is unused and in its original packaging.

Return procedure for PBSS4021NT,215:

1.Submit a request within 90 days.

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

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