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

Nexperia USA Inc. PBSS4520X,135

Name: PBSS4520X,135
Brand: Nexperia USA Inc.
SKU: PBSS4520X,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PBSS4520X,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: PBSS4520X,135.pdf

Description:: TRANS NPN 20V 5A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PBSS4520X,135 from Nexperia is a 20 V, 5 A NPN low-V_CE(sat) transistor in SOT89 package, designed as a high-efficiency medium-power switch for DC-DC converters, motor drivers, and strobe flash circuits. It delivers R_CE(sat) = 32–44 mΩ at I_C = 5 A / I_B = 500 mA, h_FE = 200–380 at full load, and operates up to 150 °C junction temperature.

For engineers reviewing the PBSS4520X,135 datasheet, PBSS4520X,135 pinout, PBSS4520X,135 application, or PBSS4520X,135 equivalent, key selection criteria include verified low saturation resistance under pulsed 5 A conditions, thermal performance on FR4 PCBs with defined mounting pad areas, and compatibility with standard SOT89 reflow footprints per Figure 14.

Technical Context

This NPN transistor uses epitaxial planar die construction optimized for low on-state loss in switching applications. Its base-emitter turn-on voltage is 0.74–0.85 V at I_C = 2 A, and it achieves f_T = 100–125 MHz, supporting fast switching in DC-DC and inverter topologies.

The device is rated for V_CEO = 20 V and I_C = 5 A continuous, with peak I_CM = 10 A (t_p ≤ 1 ms). Thermal resistance R_th(j-a) ranges from 50 K/W (standard footprint) to 80 K/W (7 cm² ceramic PCB), enabling predictable derating across ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in low-voltage switch designs.
I_C	5 A - Continuous collector current rating; supports fan/motor drivers and battery charger switches without forced cooling.
R_CE(sat)	32–44 mΩ - Verified on-resistance at I_C = 5 A / I_B = 500 mA; enables <110 mW conduction loss at full load.
h_FE	200–380 - DC current gain at I_C = 5 A; ensures robust drive margin with moderate base current (≤500 mA).
V_BE(sat)	0.96–1.1 V - Base-emitter saturation voltage at full load; determines required driver voltage headroom.
f_T	100–125 MHz - Transition frequency at V_CE = 10 V / I_C = 100 mA; supports >1 MHz PWM operation in compact converters.
P_tot	1.6 W - Total power dissipation on 7 cm² ceramic PCB; sets thermal design baseline for board-level layout.

Pinout & Package

SOT89 (SC-62/TO-243) plastic surface-mount package: 3-pin, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector tab for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Reference node for current return path; connected to ground or low-side return in common-emitter configurations.
2	Collector	Main power output terminal; electrically and thermally tied to large copper pad per Figure 14 for heat dissipation.
3	Base	Control input requiring ~500 mA drive at full load; sensitive to ESD and requires series resistor in digital logic interfaces.

Key Features

Feature	Design Value
Low V_CE(sat) at high current	160–220 mV at I_C = 5 A - Reduces conduction loss by ≥40% vs. standard bipolar transistors in same package.
High h_FE stability	h_FE ≥ 200 at I_C = 5 A - Enables direct microcontroller GPIO drive without intermediate buffer stages.
Thermal robustness	R_th(j-sp) = 16 K/W - Low junction-to-solder-point resistance ensures rapid heat transfer to PCB copper.
Pulsed current capability	I_CM = 10 A (t_p ≤ 1 ms) - Supports inrush current handling in motor start-up and flash charging cycles.
Wide operating temperature	T_j = −65 to +150 °C - Validated for industrial and consumer environments without derating below −40 °C.

Applications

Motor Drive Circuit

Strobe Flash Unit

Use Scenario: Driving 12 V DC brushless fans or small PMDC motors in network equipment enclosures.

IC Role / Device Role / Timing Role: Medium-power NPN switch controlling motor phase current in H-bridge half-bridge configuration.

Use Value: 32 mΩ R_CE(sat) limits I²R loss to <800 mW at 5 A, reducing heatsink requirements and improving system efficiency.

Use Scenario: High-current discharge switch for xenon or LED strobe capacitors in mobile phone cameras.

IC Role / Device Role / Timing Role: Fast-turn-on saturated switch delivering 5 A pulse into flash capacitor bank.

Use Value: 100 MHz f_T and 0.96 V V_BE(sat) ensure sub-microsecond turn-on, minimizing flash delay and energy loss.

TFT Display Inverter

LAN Power Switch

Use Scenario: Backlight power control in TFT-LCD panels using resonant inverter topology.

IC Role / Device Role / Timing Role: Primary switching element in self-oscillating Royer inverter stage.

Use Value: 20 V V_CEO and 10 A I_CM support 2× overvoltage margin during LC ringing, ensuring reliability.

Use Scenario: PoE-powered device enable switch isolating 48 V DC supply to downstream PHY circuitry.

IC Role / Device Role / Timing Role: Low-loss series pass switch in hot-swap or power-good control path.

Use Value: 5 A continuous rating and 1.6 W P_tot allow direct integration without external FETs in Class 3 PoE designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-V_CE(sat) transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40501MR6T1G	V_CEO = 40 V, I_C = 5 A, R_CE(sat) = 45–65 mΩ at I_C = 5 A - higher voltage rating but higher on-resistance.	Preferred where 40 V rail tolerance is required; less efficient at 12–20 V systems due to 40% higher conduction loss.	Select when overvoltage protection margin >20 V is mandatory; avoid if thermal budget is constrained at 5 A.
Diodes Incorporated DXT75500QE-13	V_CEO = 20 V, I_C = 5 A, R_CE(sat) = 35–50 mΩ, SOT89-3 package - nearly identical specs but lower h_FE (120–220) at full load.	Requires higher base drive current (≥750 mA) to achieve same saturation, increasing driver complexity.	Use only with dedicated base driver ICs; not suitable for direct MCU GPIO drive at 5 A.

Compared with PBSS4520X,135, NSS40501MR6T1G trades efficiency for voltage headroom, while DXT75500QE-13 sacrifices current gain for marginal on-resistance parity-making PBSS4520X,135 optimal for thermally constrained, MCU-driven 20 V switching applications.

Availability

PBSS4520X,135 is available at Aetrix Electronics and suitable for medium-power peripheral drivers, strobe flash units, and LAN power switches requiring stable component supply across industrial and consumer production programs.

Supply support for PBSS4520X,135 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 discrete and logic devices, with leadership in automotive, industrial, and mobile applications.

PBSS4520X,135 belongs to Nexperia's "Low V_CE(sat) Transistor" product line, engineered specifically for efficiency-critical switching in space-constrained power management circuits.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum base current (I_B) is 1 A per Table 5. However, for reliable continuous operation at I_C = 5 A, the datasheet specifies I_B = 500 mA in the R_CE(sat) test condition. Exceeding 500 mA does not improve saturation and risks accelerated degradation; sustained >700 mA is not recommended without thermal validation.

Can PBSS4520X,135 be used in linear regulator applications?

No-it is not characterized or qualified for linear operation. The device lacks guaranteed Safe Operating Area (SOA) data in the linear region, and its thermal resistance values assume switching duty cycles (δ ≤ 0.02). Continuous linear use risks thermal runaway due to positive temperature coefficient of V_CE(sat) and insufficient SOA margin.

Is the SOT89 package lead-free and RoHS compliant?

Yes. Nexperia confirms PBSS4520X,135 meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. The package uses matte tin (Sn) plating over nickel, compatible with standard Pb-free reflow profiles per J-STD-020, and has no exemptions claimed.

How does thermal performance change with different PCB copper areas?

R_th(j-a) varies from 50 K/W (standard SOT89 footprint) to 80 K/W (7 cm² ceramic PCB) per Table 6. Increasing collector pad area from 1 cm² to 6 cm² on FR4 reduces R_th(j-a) from 225 K/W to 90 K/W-enabling ~2.5× higher continuous power before reaching T_j = 150 °C at 25 °C ambient.

PBSS4520X,135 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):: 5 A

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

Vce Saturation (Max) @ Ib, Ic:: 220mV @ 500mA, 5A

Current - Collector Cutoff (Max):: 100nA

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

Power - Max:: 550 mW

Frequency - Transition:: 125MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

PBSS4520X,135 FAQ

1.How can I place an order for PBSS4520X,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4520X,135 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 PBSS4520X,135 reliable?

The price and inventory of PBSS4520X,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4520X,135 is usually 5 days.

3.What payment methods are accepted for PBSS4520X,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4520X,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4520X,135?

PBSS4520X,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4520X,135 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 PBSS4520X,135?

For technical support, including PBSS4520X,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4520X,135 requirements.

6.How does Aetrix verify that PBSS4520X,135 is sourced from the original manufacturer or authorized distributors?

All PBSS4520X,135 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 PBSS4520X,135 meets industry standards.

7.What is the process for return or replacement of PBSS4520X,135?

All PBSS4520X,135 units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4520X,135, 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 PBSS4520X,135 part is unused and in its original packaging.

Return procedure for PBSS4520X,135:

1.Submit a request within 90 days.

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

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