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

Nexperia USA Inc. BC55-16PAS-QX

Name: BC55-16PAS-QX
Brand: Nexperia USA Inc.
SKU: BC55-16PAS-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC55-16PAS-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: 3-UDFN Exposed Pad

Datasheet:: BC55-16PAS-QX.pdf

Description:: TRANS NPN 60V 1A DFN2020D-3

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Product details

Overview

BC55-16PAS-Q from Nexperia is an AEC-Q101-qualified NPN medium power transistor in a DFN2020D-3 (SOT1061D) leadless package, rated for 60 V V_CEO, 1 A continuous collector current, and 2 A peak pulse current. It delivers h_FE = 100–250 at V_CE = 2 V, I_C = 150 mA, and is optimized for automotive-grade high-side switching and MOSFET driver stages where thermal efficiency and AOI compatibility are critical.

For engineers reviewing the BC55-16PAS-Q datasheet, BC55-16PAS-Q pinout, BC55-16PAS-Q application, or BC55-16PAS-Q equivalent, this device is selected for linear voltage regulation, battery-powered load control, and power management circuits requiring stable DC current gain, low saturation voltage (≤500 mV), and robust thermal performance on FR4 PCBs with side-wettable flanks.

Technical Context

This NPN bipolar junction transistor operates as a medium-power amplifying or switching element with base-controlled current gain. Its design supports pulsed operation up to 2 A (t_p ≤ 1 ms) and maintains h_FE stability across −55 °C to 150 °C ambient range, validated per AEC-Q101 stress testing.

The DFN2020D-3 package integrates exposed collector pad for direct thermal conduction and solderable side flanks enabling automated optical inspection. Thermal resistance R_th(j-a) ranges from 76 K/W (4-layer PCB + 1 cm² collector pad) to 298 K/W (standard single-sided FR4), directly linking layout choices to safe operating area.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in 12 V/24 V automotive systems.
I_C (continuous)	1 A - Sustained collector current capability; enables driving loads such as relay coils or gate resistors of power MOSFETs.
h_FE	100–250 @ V_CE=2 V, I_C=150 mA - Confirmed DC current gain range ensures predictable base drive sizing without overdesign.
V_CE(sat)	≤500 mV @ I_C=500 mA, I_B=50 mA - Low saturation voltage minimizes conduction loss and self-heating in switching applications.
P_tot	1.65 W @ T_amb≤25 °C on 4-layer FR4 with 1 cm² collector pad - Defines maximum dissipation under controlled board-level thermal conditions.
f_T	100–180 MHz - Transition frequency confirms suitability for moderate-speed switching (e.g., PWM frequencies up to ~10 MHz).
R_th(j-sp)	20 K/W - Junction-to-solder-point thermal resistance enables accurate transient thermal modeling during pulse operation.

Pinout & Package

BC55-16PAS-Q uses the DFN2020D-3 (SOT1061D) ultra-thin, leadless surface-mount package measuring 2.0 mm × 2.0 mm × 0.65 mm with side-wettable flanks and an exposed collector thermal pad. The package supports reflow soldering per JEDEC J-STD-020 and is qualified for automotive use.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires series resistor to limit I_B ≤ 0.3 A and ensure h_FE-driven saturation.
2	Emitter (E)	Reference terminal for biasing; connected to ground or low-side return path in high-side switch configurations.
3	Collector (C)	Power output node; electrically and thermally tied to exposed bottom pad for enhanced heat dissipation and low-inductance routing.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including engine control, body electronics, and ADAS subsystems.
Side-wettable flanks (SWF)	Enables reliable automated optical inspection (AOI) of solder joints without X-ray, reducing manufacturing defect escape.
Exposed collector pad	Provides low-thermal-resistance path to PCB copper, improving power handling by up to 115% vs. standard SOT-23.
Two h_FE variants	BC55-16PAS-Q (100–250) and BC55-10PAS-Q (63–160) allow precise gain matching for analog feedback or digital switching thresholds.
Ultra-thin profile	0.65 mm max height enables use in space-constrained modules like ECU daughterboards and compact battery management units.

Applications

Linear Voltage Regulators

Battery-Driven Devices

Use Scenario: Used as pass transistor in adjustable LDOs or discrete emitter-follower regulators supplying 3.3 V/5 V rails from 12 V vehicle batteries.

IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via base bias network; operates in linear region with continuous I_C ≤ 1 A.

Use Value: Low V_CE(sat) reduces dropout voltage and improves efficiency at full load; AEC-Q101 rating ensures reliability across temperature cycling.

Use Scenario: Controls power to portable medical monitors, handheld test equipment, or IoT sensors powered by Li-ion or alkaline cells.

IC Role / Device Role / Timing Role: High-side load switch enabling system-level power gating; driven by microcontroller GPIO with minimal external components.

Use Value: 60 V rating accommodates battery stack voltages and surge transients; SWF package allows AOI verification in low-volume assembly.

MOSFET Drivers

Power Management

Use Scenario: Drives the gate of N-channel power MOSFETs in buck converters, motor drivers, or LED current sources.

IC Role / Device Role / Timing Role: Current amplifier stage translating logic-level signals into higher gate charge current (I_B → I_C × h_FE).

Use Value: 100–250 h_FE ensures fast turn-on with modest base drive; f_T > 100 MHz supports switching up to 10 MHz PWM.

Use Scenario: Implements overcurrent protection, load dump clamping, or auxiliary supply sequencing in automotive infotainment and ADAS ECUs.

IC Role / Device Role / Timing Role: Discrete switch or current-sense amplifier front-end; handles repetitive 2 A pulses during fault events.

Use Value: 2 A I_CM withstands short-duration surges; R_th(j-sp) = 20 K/W enables accurate thermal response modeling during transient overload.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC54-16PAS-Q	PNP complement; identical package, ratings, and h_FE range but opposite polarity.	Suitable for low-side switching or complementary push-pull stages; not interchangeable in high-side configurations.	Select when circuit topology requires PNP functionality or complementary pair matching.
ZTX1051A	TO-92 package; 60 V V_CEO, 1 A I_C, h_FE = 100–300, but no AEC-Q101 qualification or SWF features.	Limited to non-automotive industrial or consumer use; lacks AOI support and thermal pad for high-power density layouts.	Choose only for cost-sensitive, non-automotive designs where manual inspection and larger footprint are acceptable.

Compared with BC55-16PAS-Q, BC54-16PAS-Q provides polarity-matched functionality in identical automotive-qualified packaging, while ZTX1051A offers higher h_FE but sacrifices AEC-Q101 compliance, thermal performance, and manufacturability-making it unsuitable for safety-critical or high-density automotive PCBs.

Availability

BC55-16PAS-Q is available at Aetrix Electronics and suitable for automotive ECUs, battery management systems, and industrial power controllers requiring stable component supply, AEC-Q101 compliance, and consistent parametric performance across production lots.

Supply support for BC55-16PAS-Q 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 specializing in high-performance, high-reliability discrete, logic, and MOSFET devices, with leadership in automotive-qualified components and advanced packaging technologies.

The BC55xPAS-Q series belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor product line, engineered specifically for automotive power management, load switching, and driver applications demanding robust thermal behavior and AOI-compatible assembly.

FAQ

What is the maximum allowable base current for BC55-16PAS-Q?

The absolute maximum base current is 0.3 A, as specified in the Limiting Values table. Exceeding this risks permanent damage to the base-emitter junction. For reliable switching, design base drive to deliver I_B = I_C/10 (e.g., 100 mA for 1 A I_C) using h_FE ≥ 100, ensuring saturation while staying within safe operating limits.

Can BC55-16PAS-Q be used in high-frequency switching applications above 1 MHz?

Yes-its f_T of 100–180 MHz supports switching up to ~10 MHz with adequate gain margin. However, practical use above 1 MHz requires careful PCB layout: minimize trace inductance on collector/base paths, use ground plane beneath the exposed pad, and verify V_CE(sat) and switching losses under actual load conditions per Figure 10.

How does the DFN2020D-3 package improve thermal performance over traditional SOT-23?

The DFN2020D-3 package reduces R_th(j-a) by up to 75% versus SOT-23 due to its exposed collector pad and side-wettable flanks, which increase copper contact area and enable direct thermal conduction to inner PCB layers. On a 4-layer board with 1 cm² collector pad, R_th(j-a) drops to 76 K/W-enabling 1.65 W dissipation at 25 °C ambient, versus ~0.5 W for standard SOT-23.

Is BC55-16PAS-Q pin-compatible with other devices in the BC55xPAS-Q series?

Yes-all BC55xPAS-Q variants (BC55PAS-Q, BC55-10PAS-Q, BC55-16PAS-Q) share identical DFN2020D-3 pinout (B-E-C), package dimensions, and thermal characteristics. Only h_FE range differs: BC55-16PAS-Q (100–250), BC55-10PAS-Q (63–160), and BC55PAS-Q (63–250). This allows drop-in gain optimization without layout changes.

BC55-16PAS-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC55xPAS-Q

Package/Case:: 3-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 2V

Power - Max:: 420 mW

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DFN2020D-3

BC55-16PAS-QX FAQ

1.How can I place an order for BC55-16PAS-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BC55-16PAS-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 BC55-16PAS-QX reliable?

The price and inventory of BC55-16PAS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC55-16PAS-QX is usually 5 days.

3.What payment methods are accepted for BC55-16PAS-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC55-16PAS-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC55-16PAS-QX?

BC55-16PAS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC55-16PAS-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 BC55-16PAS-QX?

For technical support, including BC55-16PAS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC55-16PAS-QX requirements.

6.How does Aetrix verify that BC55-16PAS-QX is sourced from the original manufacturer or authorized distributors?

All BC55-16PAS-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 BC55-16PAS-QX meets industry standards.

7.What is the process for return or replacement of BC55-16PAS-QX?

All BC55-16PAS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC55-16PAS-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 BC55-16PAS-QX part is unused and in its original packaging.

Return procedure for BC55-16PAS-QX:

1.Submit a request within 90 days.

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

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