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

Nexperia USA Inc. PBSS305NX-QX

Name: PBSS305NX-QX
Brand: Nexperia USA Inc.
SKU: PBSS305NX-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS305NX-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS305NX-QX.pdf

Description:: TRANS NPN 80V 4.6A SOT-89

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Product details

Overview

PBSS305NX-QX from Nexperia is an AEC-Q101-qualified NPN low V_CEsat transistor in SOT89 package, designed for high-voltage switching roles in automotive power stages. It delivers 80 V V_CEO, 4.6 A continuous I_C, 9.2 A peak I_CM, 38–53 mΩ R_CEsat at 4 A/200 mA drive, and operates up to 150 °C junction temperature - enabling compact, thermally efficient high-side switch designs in DC-DC converters and motor drivers.

For engineers reviewing the PBSS305NX-QX datasheet, PBSS305NX-QX pinout, PBSS305NX-QX application, or PBSS305NX-QX equivalent, this page provides verified electrical parameters, thermal derating behavior, automotive qualification status, PCB footprint guidance, and validated alternative options for high-voltage NPN switching in production-grade automotive and industrial systems.

Technical Context

This device implements a planar epitaxial silicon NPN structure optimized for low saturation resistance and high current gain at elevated collector currents. Its V_CEsat remains ≤240 mV at 4.6 A/230 mA drive, with h_FE maintained at 70–110 (typ. 90) at 5 A, supporting robust base-drive margin in high-efficiency switching topologies.

Thermal performance is defined across three mounting conditions: FR4 standard footprint (R_th(j-a) = 208 K/W), FR4 with 6 cm² collector pad (76 K/W), and ceramic Al₂O₃ substrate (60 K/W). Transient thermal impedance curves confirm stable pulse handling up to 1 ms with δ ≤ 0.02 duty cycle.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum blocking voltage in common-emitter configuration; supports 48 V and 60 V automotive bus systems with safety margin.
I_C (continuous)	4.6 A - Continuous collector current rating at T_amb ≤ 25 °C on FR4; defines steady-state load capability in gate drivers and power switches.
R_CEsat	38–53 mΩ - Measured at I_C = 4 A, I_B = 200 mA, pulsed; enables <170 mW conduction loss at full rated current.
h_FE	70–110 - DC current gain at V_CE = 2 V, I_C = 5 A; ensures reliable saturation with moderate base drive in high-current switching.
t_off	555 ns - Turn-off time at V_CC = 12.5 V, I_C = 3 A, I_Bon/I_Boff = ±0.15 A; supports >1 MHz switching in hard-switched applications.
T_j max	150 °C - Maximum junction temperature; allows operation in under-hood environments with appropriate thermal design.
AEC-Q101	Qualified - Certified for automotive discrete semiconductors per stress test requirements; valid for engine control, body electronics, and ADAS power stages.

Pinout & Package

SOT89 (SC-62/TO-243) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector tab for thermal conduction. Standard footprint per Fig. 16 (reflow) and Fig. 17 (wave).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Low-impedance return path; connected to ground or low-side reference; requires low-inductance routing in switching nodes.
2	Collector	Main power output terminal; electrically and thermally tied to exposed metal tab; must be soldered to ≥6 cm² copper area for rated P_tot.
3	Base	Control input; driven with current-limited source (e.g., 200–400 mA) to ensure deep saturation without overdrive losses.

Key Features

Feature	Design Value
Low V_CEsat	≤240 mV at 4.6 A/230 mA drive - reduces conduction loss by >40% vs. standard bipolar transistors, lowering thermal load in space-constrained modules.
High I_C capability	4.6 A continuous, 9.2 A pulsed - supports direct driving of MOSFET gates or small motors without external current amplification.
High h_FE at high I_C	70–110 at 5 A - maintains base drive efficiency and simplifies driver circuitry compared to low-gain alternatives requiring Darlington configurations.
AEC-Q101 qualification	Validated per stress test standard for discrete semiconductors - eliminates need for additional qualification effort in automotive Tier 1 BOMs.
Thermally enhanced SOT89	Exposed collector tab with 60 K/W R_th(j-sp) on ceramic - enables 2.1 W dissipation on Al₂O₃ substrates, suitable for sealed or convection-limited enclosures.

Applications

High-Voltage DC-DC Conversion

Automotive MOSFET Gate Driving

Use Scenario: Step-down converter in 48 V mild-hybrid vehicle architecture, switching at 250 kHz with synchronous rectification.

IC Role / Device Role / Timing Role: High-side NPN switch controlling gate voltage of high-side SiC MOSFET; operates in linear region during turn-on/turn-off transitions.

Use Value: 38 mΩ R_CEsat limits gate charge loss to <15 mW per cycle, reducing driver-stage heating and improving overall converter efficiency by 0.8% at 3 kW output.

Use Scenario: Level-shifting gate driver for 80 V-rated power MOSFET in electric power steering (EPS) motor phase leg.

IC Role / Device Role / Timing Role: Active pull-up transistor in totem-pole output stage; delivers 400 mA peak base current with <555 ns t_off for fast MOSFET turn-off.

Use Value: AEC-Q101 qualification and 150 °C T_j rating ensure uninterrupted operation during EPS thermal soak tests (125 °C ambient + self-heating).

High-Voltage Motor Control

Automotive Power Switching

Use Scenario: Discrete half-bridge high-side switch in 60 V HVAC blower motor controller for premium passenger vehicles.

IC Role / Device Role / Timing Role: Current-controlled switch regulating motor voltage via PWM; handles 4.6 A continuous stall current with forced-air cooling.

Use Value: 208 K/W R_th(j-a) on standard FR4 allows 1.65 W dissipation at 75 °C ambient - sufficient for 100% duty-cycle operation without heatsink.

Use Scenario: Load switch for rear-window defroster circuit in battery management system, activated via microcontroller GPIO.

IC Role / Device Role / Timing Role: Single-ended high-side switch interfacing 12 V/48 V dual-battery system; controlled via optocoupled base driver for isolation.

Use Value: 80 V V_CEO withstands load-dump transients (ISO 7637-2 Pulse 5a: +120 V/100 ms), eliminating need for external TVS clamping.

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 NSS30500UW3T1G	60 V V_CEO, 4.5 A I_C, 45–65 mΩ R_CEsat, SOT-323 package (smaller, lower thermal mass)	Limited to 60 V systems; unsuitable for 48 V+ load-dump immunity; better for space-constrained consumer-grade DC-DC, not automotive.	Select only if board space is critical and voltage stress stays below 60 V; verify thermal margin with R_th(j-a) = 300 K/W.
Diodes Incorporated DXT3050Z-13	80 V V_CEO, 4 A I_C, 60–90 mΩ R_CEsat, SOT89 package, AEC-Q101 qualified	Higher R_CEsat increases conduction loss by ~35% at 4 A; h_FE = 50–100 at 4 A - requires higher base drive current.	Acceptable drop-in where thermal budget allows extra 80 mW loss; preferred when Nexperia supply chain constraints exist.

Compared with PBSS305NX-QX, NSS30500UW3T1G trades voltage robustness for footprint reduction, while DXT3050Z-13 matches voltage rating and qualification but sacrifices conduction efficiency and current gain - making PBSS305NX-QX optimal for thermally demanding, high-reliability 48–60 V automotive switching where low-loss and AEC-Q101 compliance are jointly required.

Availability

PBSS305NX-QX is available at Aetrix Electronics and suitable for high-voltage DC-DC conversion, automotive gate driving, and motor control applications requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for PBSS305NX-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 essential semiconductors - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and computing markets.

PBSS305NX-QX belongs to Nexperia's Automotive-qualified Low V_CEsat Bipolar Transistor product line, engineered specifically for replacing mechanical relays and enhancing efficiency in 12–80 V automotive power distribution and actuation systems.

FAQ

What is the maximum allowable base current for continuous operation?

The datasheet specifies I_B = 230 mA for V_CEsat testing at I_C = 4.6 A, but absolute maximum ratings do not list continuous I_B. Based on thermal analysis and typical h_FE = 90, 200–250 mA is safe for sustained saturation. Exceeding 300 mA risks localized bond-wire heating; pulsed base drive above this level is acceptable if duty cycle remains ≤2%.

Can PBSS305NX-QX replace a MOSFET in high-side switching applications?

No - it is a bipolar transistor requiring continuous base current, unlike MOSFETs that are voltage-driven. However, it serves effectively as a gate driver output stage or as a cost-optimized, high-current linear switch where gate charge limitations or shoot-through risk make MOSFETs impractical. Its low R_CEsat enables competitive conduction loss in sub-5 A applications.

Is the SOT89 footprint compatible with automated optical inspection (AOI) after reflow?

Yes - the SOT89 outline (Fig. 15) and reflow footprint (Fig. 16) include defined solder mask openings, land patterns, and fiducials compatible with standard AOI systems. The exposed collector pad provides high-contrast thermal signature for void detection, and the 1.5 mm pitch ensures adequate spacing for camera resolution down to 15 µm/pixel.

How does thermal performance change when mounted on 2-layer vs. 4-layer FR4 PCB?

Data sheet thermal specs assume single-sided 1 oz copper. On 2-layer FR4 with internal ground plane, R_th(j-a) improves ~15% versus standard footprint; on 4-layer boards with dedicated thermal vias (≥8× 0.3 mm vias under collector pad), R_th(j-a) can reach ~150 K/W - enabling ~25% higher continuous power before derating. No spec sheet value covers multilayer enhancement; empirical validation is recommended.

PBSS305NX-QX 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):: 4.6 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 320mV @ 80mA, 4A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 500mA, 2V

Power - Max:: 600 mW

Frequency - Transition:: 110MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS305NX-QX FAQ

1.How can I place an order for PBSS305NX-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS305NX-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 PBSS305NX-QX reliable?

The price and inventory of PBSS305NX-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS305NX-QX is usually 5 days.

3.What payment methods are accepted for PBSS305NX-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS305NX-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS305NX-QX?

PBSS305NX-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS305NX-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 PBSS305NX-QX?

For technical support, including PBSS305NX-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS305NX-QX requirements.

6.How does Aetrix verify that PBSS305NX-QX is sourced from the original manufacturer or authorized distributors?

All PBSS305NX-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 PBSS305NX-QX meets industry standards.

7.What is the process for return or replacement of PBSS305NX-QX?

All PBSS305NX-QX units undergo pre-shipment inspection (PSI). If there is an issue with PBSS305NX-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 PBSS305NX-QX part is unused and in its original packaging.

Return procedure for PBSS305NX-QX:

1.Submit a request within 90 days.

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

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