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

Nexperia USA Inc. BF822-QR

Name: BF822-QR
Brand: Nexperia USA Inc.
SKU: BF822-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF822-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BF822-QR.pdf

Description:: TRANS NPN 250V 0.05A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BF822-QR from Nexperia is an NPN high-voltage bipolar junction transistor in SOT23 package, rated for 250 V V_CEO and 250 V V_CBO, with 50 mA I_C max and 60 MHz f_T, designed for high-voltage switching in telephony line interface circuits and automotive signal conditioning stages.

For engineers reviewing the BF822-QR datasheet, BF822-QR pinout, BF822-QR application, or BF822-QR equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (500 K/W), saturation voltage (600 mV at I_C = 30 mA), and exact SOT23 terminal mapping to support robust high-voltage discrete selection.

Technical Context

This device operates as a high-voltage NPN switch with low leakage (I_CBO ≤ 10 nA at 200 V, 25 °C) and stable DC current gain (h_FE ≥ 50 at V_CE = 20 V, I_C = 25 mA). Its 150 °C maximum junction temperature and FR4-mount R_th(j-a) of 500 K/W define thermal limits under continuous operation.

The transistor supports fast switching via 60 MHz transition frequency and exhibits minimal feedback capacitance (C_re = 1.6 pF at V_CB = 30 V), enabling use in high-impedance, low-noise analog signal paths where voltage standoff and capacitive loading are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	250 V - Enables direct interface with telephone line voltages up to −48 V with margin for transients
I_C max	50 mA - Supports low-power relay driving and biasing of downstream high-impedance stages
f_T	60 MHz - Permits stable operation in audio-band amplifiers and broadband line drivers
V_CE(sat)	600 mV @ I_C = 30 mA - Minimizes conduction loss in saturated-switch applications
R_th(j-a)	500 K/W - Requires careful PCB copper area planning on FR4 for sustained 250 mW dissipation
I_CBO	10 nA @ V_CB = 200 V - Ensures negligible leakage in high-impedance voltage sensing nodes

Pinout & Package

SOT23 plastic surface-mounted package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, optimized for automated reflow assembly per IPC-7351 footprint (sot023_fr).

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires series resistor to limit I_B ≤ 50 mA peak
2	Emitter (E)	Common reference terminal; tied to system ground or negative rail in common-emitter configuration
3	Collector (C)	High-voltage output node; handles up to 250 V reverse-biased with respect to emitter

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114
250 V breakdown rating	Supports telecom line interface designs compliant with ITU-T K.20 surge immunity requirements
Low I_CBO leakage	Preserves signal integrity in high-impedance bias networks over full −65 °C to +150 °C range
SOT23 footprint	Enables space-constrained PCB layouts while maintaining thermal performance via exposed pad alternatives (not present here)

Applications

Telephone Line Interface

Automotive Sensor Signal Conditioning

Use Scenario: Isolating and switching −48 V POTS line signals with transient protection.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling relay coil drive or hybrid circuit biasing.

Use Value: 250 V V_CEO provides 5× margin over nominal line voltage, reducing need for external clamping.

Use Scenario: Amplifying low-level signals from pressure or position sensors in engine control modules.

IC Role / Device Role / Timing Role: Discrete gain stage or level-shifting element in analog front-end signal chain.

Use Value: Stable h_FE ≥ 50 and low C_re (1.6 pF) preserve bandwidth and minimize loading on sensor outputs.

Industrial Analog Multiplexing

LED Driver Bias Control

Use Scenario: Selecting between multiple high-impedance analog inputs in programmable logic controller I/O modules.

IC Role / Device Role / Timing Role: Voltage-controlled switch enabling channel isolation without CMOS leakage penalties.

Use Value: I_CBO ≤ 10 nA ensures <1 µV offset drift across 10 kΩ source impedances at 85 °C.

Use Scenario: Regulating current through high-brightness LEDs in automotive interior lighting.

IC Role / Device Role / Timing Role: Linear current sink with base-driven precision in constant-current topology.

Use Value: V_CE(sat) ≤ 600 mV reduces power loss and thermal rise in thermally constrained lamp housings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC846B-Q	Lower V_CEO (65 V), higher h_FE (200–450), same SOT23 package	Not suitable for >100 V applications; limited to low-voltage logic interfacing	Select only when voltage stress remains below 50 V and higher gain is required
BF823-Q	PNP complement; identical voltage/current ratings and AEC-Q101 qualification	Used in complementary push-pull or level-shifting configurations requiring matched characteristics	Choose when designing symmetric high-voltage driver stages or active clamps

Compared with BC846B-Q and BF823-Q, BF822-QR uniquely balances 250 V capability with automotive qualification and low-leakage performance-making it irreplaceable in telecom and high-side sensing where voltage margin and reliability are non-negotiable.

Availability

BF822-QR is available at Aetrix Electronics and suitable for telephone line interface, automotive sensor signal conditioning, and industrial analog multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BF822-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 essential semiconductors, delivering discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

BF822-QR belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered specifically for robust signal switching and conditioning in harsh-environment communication and vehicle subsystems.

FAQ

Is BF822-QR pin-compatible with standard SOT23 NPN transistors like BC817?

No. While both use SOT23 packaging, BF822-QR follows Nexperia's specific pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. BC817 uses Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Physical insertion into the same footprint will result in incorrect biasing and potential device failure.

What is the maximum allowable continuous power dissipation at 85 °C ambient?

At T_amb = 85 °C, derated power dissipation is 125 mW, calculated using P_tot = (T_j(max) − T_amb) / R_th(j-a) = (150 − 85) / 500 = 0.13 W. This assumes mounting on FR4 with no additional copper heatsinking per the datasheet test condition.

Does BF822-QR support pulsed operation beyond its 50 mA DC rating?

Yes. The datasheet specifies I_CM = 100 mA for single pulses ≤ 1 ms. For repetitive pulsing, duty cycle must be limited to maintain average power within 250 mW and junction temperature ≤ 150 °C, requiring thermal modeling based on actual PCB layout and pulse profile.

Can BF822-QR be used in linear amplifier configurations?

Yes, but with constraints: f_T = 60 MHz and h_FE ≥ 50 support stable small-signal amplification up to ~10 MHz. However, V_CE(sat) and thermal resistance limit usable output swing and power efficiency-best suited for low-gain, high-input-impedance preamplifier stages rather than power output stages.

BF822-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 50 mA

Voltage - Collector Emitter Breakdown (Max):: 250 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 30mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 25mA, 20V

Power - Max:: 250 mW

Frequency - Transition:: 60MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BF822-QR FAQ

1.How can I place an order for BF822-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BF822-QR 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 BF822-QR reliable?

The price and inventory of BF822-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF822-QR is usually 5 days.

3.What payment methods are accepted for BF822-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF822-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF822-QR?

BF822-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF822-QR 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 BF822-QR?

For technical support, including BF822-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF822-QR requirements.

6.How does Aetrix verify that BF822-QR is sourced from the original manufacturer or authorized distributors?

All BF822-QR 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 BF822-QR meets industry standards.

7.What is the process for return or replacement of BF822-QR?

All BF822-QR units undergo pre-shipment inspection (PSI). If there is an issue with BF822-QR, 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 BF822-QR part is unused and in its original packaging.

Return procedure for BF822-QR:

1.Submit a request within 90 days.

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

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