Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. PBSS4021PX-QX

Name: PBSS4021PX-QX
Brand: Nexperia USA Inc.
SKU: PBSS4021PX-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PBSS4021PX-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS4021PX-QX.pdf

Description:: TRANS PNP 20V 6.2A SOT-89

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,580

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PBSS4021PX-QX from Nexperia is a PNP low V_CEsat transistor in SOT89 package, rated for −20 V V_CEO, −6.2 A I_C, and 23 mΩ R_CEsat at −4 A/−400 mA drive. It delivers high current gain (h_FE = 80–210) and qualifies per AEC-Q101 for automotive load switching in battery-powered power management circuits.

For engineers reviewing the PBSS4021PX-QX datasheet, PBSS4021PX-QX pinout, PBSS4021PX-QX application, or PBSS4021PX-QX equivalent, this device is selected for high-efficiency, thermally robust PNP switching where low conduction loss and automotive-grade reliability are required in compact SMT layouts.

Technical Context

This PNP bipolar transistor operates with a maximum collector-emitter breakdown voltage of −20 V and supports continuous collector currents up to −6.2 A, with peak capability of −15 A for ≤1 ms pulses. Its low saturation resistance (23 mΩ typ.) enables minimal power loss during on-state conduction in high-current DC switching paths.

The device features fast switching performance (t_on = 93 ns, t_off = 434 ns) and high DC current gain across temperature (h_FE ≥ 80 at −7 A), optimized for stable operation in automotive ambient ranges (−55 °C to +150 °C). Thermal resistance to ambient varies from 50 K/W (ceramic PCB) to 208 K/W (standard FR4), enabling thermal-aware board-level design.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−20 V - Maximum safe collector-emitter blocking voltage under open-base conditions.
I_C	−6.2 A - Continuous DC collector current rating, defining steady-state load-switching capacity.
R_CEsat	23 mΩ (typ.) - Low on-resistance at −4 A/−400 mA drive, minimizing I²R loss and heat generation.
h_FE	80–210 - High DC current gain at −2 V V_CE, reducing required base drive current for efficient control.
V_CEsat	−160 mV (max) at −6.9 A/−345 mA - Ultra-low saturation voltage ensures <0.11 W conduction loss at full rated current.
T_j max	+150 °C - Maximum junction temperature, supporting operation in under-hood automotive environments.
AEC-Q101	Qualified - Meets stress-test requirements for discrete semiconductors in automotive applications.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector pad for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to system ground or low-side return path in PNP switch configurations.
2	Collector	Main current input terminal; electrically and thermally tied to large copper pour for power dissipation.
3	Base	Control input; requires negative current injection (−100 mA typical) to saturate the transistor.

Key Features

Feature	Design Value
Low V_CEsat	−160 mV max at −6.9 A enables >98% efficiency in 12 V load-switching applications.
High I_C capability	−6.2 A continuous rating supports direct driving of motors, fans, and battery charging FETs without external amplification.
AEC-Q101 qualification	Validated for automotive use including temperature cycling, HTRB, and ESD testing per JESD22 standards.
Thermal robustness	2.5 W total power dissipation on ceramic PCB allows sustained operation without active cooling in space-constrained modules.
Fast switching	434 ns turn-off time minimizes transition losses in PWM-controlled power stages operating up to 100 kHz.

Applications

Automotive Load Switch

Battery Protection Circuit

Use Scenario: Controlling power delivery to infotainment head units or ADAS sensors in 12 V vehicle electrical systems.

IC Role / Device Role / Timing Role: PNP high-side switch managing main power rail activation/deactivation with reverse-polarity protection.

Use Value: Low R_CEsat reduces voltage drop and self-heating during cranking conditions (6.5 V min battery), ensuring reliable startup sequencing.

Use Scenario: Isolating Li-ion battery packs from downstream loads during overcurrent or thermal fault events.

IC Role / Device Role / Timing Role: Primary current-handling switch in smart battery management systems, controlled by microcontroller GPIO.

Use Value: −15 A peak current rating handles surge loads (e.g., motor startup), while AEC-Q101 compliance guarantees field reliability in EV/HEV battery enclosures.

DC Motor Driver Stage

USB-C Power Delivery Switch

Use Scenario: Driving brushed DC cooling fans or auxiliary pumps in engine control modules.

IC Role / Device Role / Timing Role: Single-transistor half-bridge high-side element in H-bridge or single-direction drive topologies.

Use Value: High h_FE at −4 A reduces base drive power requirement, simplifying gate driver IC selection and lowering BOM count.

Use Scenario: Enabling/disabling VBUS power paths in automotive USB-C docking stations with programmable current limiting.

IC Role / Device Role / Timing Role: Precision-controlled PNP pass element responding to I²C-configured load switch controllers.

Use Value: Tight V_CEsat tolerance (±110 mV) ensures consistent voltage regulation across production units, meeting USB PD 3.1 ±5% VBUS accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40201LT1G	−20 V V_CEO, −4.8 A I_C, 45 mΩ R_CEsat - lower current rating and higher saturation resistance.	Less suitable for >5 A continuous loads; acceptable only in derated 12 V fan control with forced air cooling.	Select when cost sensitivity outweighs thermal margin and peak current demand.
Diodes Incorporated DXT3904PZ-7	−40 V V_CEO, −3 A I_C, 100 mΩ R_CEsat - higher voltage rating but significantly higher conduction loss.	Applicable in industrial 24 V systems but inefficient in 12 V automotive due to excessive V_CEsat (>300 mV).	Choose only if system requires >30 V blocking and thermal budget permits 2× conduction loss.

Compared with PBSS4021PX-QX, both alternatives trade off either current handling (NSS40201LT1G) or conduction efficiency (DXT3904PZ-7), making them suboptimal for automotive 12 V/6 A load switching where thermal density and AEC-Q101 validation are critical.

Availability

PBSS4021PX-QX is available at Aetrix Electronics and suitable for automotive load switching, battery protection circuits, and DC motor driver stages requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PBSS4021PX-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 high-volume, high-reliability logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.

PBSS4021PX-QX belongs to Nexperia's low V_CEsat bipolar transistor product line, engineered specifically for energy-efficient, thermally constrained automotive power switching applications.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum base current is −1 A per datasheet limiting values. However, for reliable continuous operation at −6.2 A collector current, the recommended base drive is −345 mA (IC/IB = 18), ensuring saturation while avoiding excessive base power dissipation and thermal stress on the bond wires.

Can PBSS4021PX-QX be used in parallel configurations for higher current?

No - this PNP bipolar transistor lacks inherent current-sharing characteristics due to negative temperature coefficient of V_CEsat. Parallel operation risks thermal runaway; discrete current balancing resistors or dedicated current-sharing ICs would be required, negating size and efficiency advantages.

Is the SOT89 package lead-free and RoHS compliant?

Yes - PBSS4021PX-QX uses lead-free terminations and complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with homogeneous material declarations available upon request through Nexperia's compliance portal.

How does thermal performance differ between FR4 and ceramic PCB mounting?

On standard FR4 (single-layer, 35 µm Cu), R_th(j-a) is 208 K/W, limiting continuous power to ~600 mW at 25 °C ambient. On Al₂O₃ ceramic PCB, R_th(j-a) drops to 50 K/W, enabling full 2.5 W dissipation - a 4.2× improvement critical for sealed automotive enclosures without airflow.

PBSS4021PX-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 6.2 A

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

Vce Saturation (Max) @ Ib, Ic:: 270mV @ 40mA, 4A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 1A, 2V

Power - Max:: 600 mW

Frequency - Transition:: 105MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS4021PX-QX FAQ

1.How can I place an order for PBSS4021PX-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4021PX-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 PBSS4021PX-QX reliable?

The price and inventory of PBSS4021PX-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4021PX-QX is usually 5 days.

3.What payment methods are accepted for PBSS4021PX-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4021PX-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4021PX-QX?

PBSS4021PX-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4021PX-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 PBSS4021PX-QX?

For technical support, including PBSS4021PX-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4021PX-QX requirements.

6.How does Aetrix verify that PBSS4021PX-QX is sourced from the original manufacturer or authorized distributors?

All PBSS4021PX-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 PBSS4021PX-QX meets industry standards.

7.What is the process for return or replacement of PBSS4021PX-QX?

All PBSS4021PX-QX units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4021PX-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 PBSS4021PX-QX part is unused and in its original packaging.

Return procedure for PBSS4021PX-QX:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…