Nexperia USA Inc. BF820-QR

Overview

BF820-QR from Nexperia is an NPN high-voltage transistor in SOT23 package, rated for 300 V VCBO/VCEO, 50 mA IC, and 60 MHz fT, with AEC-Q101 qualification for automotive signal switching in telephony and professional comms equipment.

For engineers reviewing the BF820-QR datasheet, BF820-QR pinout, BF820-QR application, or BF820-QR equivalent, this page delivers verified electrical ratings, thermal resistance (500 K/W), saturation voltage (600 mV), cut-off current (10 nA), and junction temperature limit (150 °C) to support high-reliability discrete selection.

Technical Context

This NPN bipolar junction transistor operates as a high-voltage switch in open-base or open-emitter configurations, supporting up to 300 V blocking capability and 50 mA continuous collector current at ambient temperatures from –65 °C to +150 °C.

Its 60 MHz transition frequency and 1.6 pF feedback capacitance enable stable RF-adjacent signal routing, while the 50–100 hFE range at 25 mA ensures predictable DC gain in low-current bias networks.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, optimized for reflow and wave soldering per Nexperia footprints sot023_fr and sot023_fw.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Compared with BC846B-Q and BF821-Q, BF820-QR uniquely delivers 300 V blocking in an AEC-Q101-qualified SOT23 NPN device-enabling single-transistor solutions in telecom and automotive high-side switching where voltage margin and qualification are non-negotiable.

Availability

BF820-QR is available at Aetrix Electronics and suitable for telecom line interface, automotive sensor conditioning, professional audio equipment, and industrial power supply feedback requiring stable component supply and automotive-grade traceability.

Supply support for BF820-QR 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, headquartered in Nijmegen, Netherlands.

BF820-QR belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered for robust signal switching in automotive, telecom, and industrial environments where voltage endurance and thermal stability are critical.

FAQ

Is BF820-QR pin-compatible with standard SOT23 NPN transistors like BC817?

No. While both use SOT23 packages, BF820-QR has Base–Emitter–Collector pinout (1–2–3), whereas BC817 uses Emitter–Base–Collector (1–2–3). Incorrect PCB layout may cause functional failure. Always verify pin assignment using Nexperia's official package outline diagram.

What is the maximum allowable power dissipation at 100 °C ambient temperature?

At Tamb = 100 °C, derated power dissipation is 125 mW, calculated from Ptot = 250 mW × (1 − (100 − 25)/500), using Rth(j-a) = 500 K/W. Exceeding this risks junction temperature exceeding 150 °C, triggering permanent degradation.

Does BF820-QR support linear (analog) operation, or is it intended only for switching?

BF820-QR supports both modes: its 60 MHz fT and 50–100 hFE range allow stable linear amplification at low currents (<25 mA), while its 300 V rating and 600 mV VCE(sat) make it equally effective in saturated switching applications such as relay drivers.

How does the AEC-Q101 qualification impact board-level reliability testing?

AEC-Q101 qualification confirms BF820-QR passed accelerated stress tests-including HTGB, HTRB, and temperature cycling-ensuring ≥15-year field life in automotive underhood environments. It does not eliminate need for system-level validation but reduces risk of early-life infant mortality failures.