Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

NXP Semiconductors BF422,116

Name: BF422,116
Brand: NXP Semiconductors
SKU: BF422,116
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BF422,116

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BF422,116.pdf

Description:: TRANS NPN 250V 0.05A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,887

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BF422,116 from NXP Semiconductors is an NPN high-voltage transistor in TO-92 (SOT54) package, rated for 250 V collector-emitter voltage (V_CEO), 100 mA peak collector current (I_CM), and 1.6 pF feedback capacitance (C_re). It serves as a video output stage switch in professional colour TV and monitor equipment.

For engineers reviewing the BF422,116 datasheet, BF422,116 pinout, BF422,116 application, or BF422,116 equivalent, key selection criteria include high-voltage switching capability, low feedback capacitance for stable RF/video gain, DC current gain ≥50 at 25 mA, and thermal resistance of 150 K/W when mounted on PCB.

Technical Context

The BF422,116 operates as a high-voltage NPN switching transistor optimized for Class-B video output stages. Its 250 V V_CEO rating and 1.6 pF C_re enable stable high-frequency amplification without parasitic oscillation in CRT driver circuits.

It features a DC current gain (h_FE) of minimum 50 at V_CE = 20 V and I_C = 25 mA, with V_CE(sat) ≤ 0.6 V at I_C = 30 mA / I_B = 5 mA - ensuring efficient saturation in linear video output configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	250 V - supports operation in high-voltage video output rails up to 250 V without breakdown.
I_CM	100 mA - handles peak video signal current transients in CRT deflection and drive stages.
C_re	1.6 pF - minimizes Miller effect and maintains bandwidth stability in high-gain video amplifiers.
h_FE	≥50 @ 25 mA - ensures reliable base drive efficiency and predictable current amplification in linear Class-B stages.
R_th(j-a)	150 K/W - defines thermal derating slope; requires PCB copper area for safe 830 mW dissipation at T_amb ≤ 25 °C.
f_T	60 MHz - enables usable gain at video frequencies including horizontal scan (15.625 kHz) and chroma (3.58/4.43 MHz) bands.

Pinout & Package

BF422,116 is housed in a plastic single-ended leaded (through-hole) TO-92 package, also designated SC-43A and SOT54, with 3 leads and standard 2.54 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased junction; accepts base current to drive 30–100 mA collector current.
2	Collector	High-voltage output node; connected to video load (e.g., CRT grid or deflection yoke) and supply rail up to 250 V.
3	Emitter	Reference terminal tied to ground or cathode return path; carries full collector current in active/saturation modes.

Key Features

Feature	Design Value
Low feedback capacitance	1.6 pF - reduces unwanted coupling between collector and base, critical for stable video amplifier phase margin.
High collector-emitter voltage rating	250 V V_CEO - enables direct interface with CRT anode supply rails and flyback-derived HV sources.
DC current gain consistency	h_FE ≥ 50 at 25 mA - simplifies bias network design and improves linearity in Class-B video output stages.
Thermal performance on PCB	R_th(j-a) = 150 K/W - allows 830 mW power dissipation with minimal heatsinking when mounted on standard FR-4 board.

Applications

Colour Television Video Output	Professional Monitor Driver
Use Scenario: Driving CRT grid or cathode in PAL/NTSC broadcast receivers with 200–250 V anode supplies. IC Role / Device Role / Timing Role: NPN high-voltage switching transistor operating in Class-B linear mode for luminance and chroma signal amplification. Use Value: 250 V V_CEO and 1.6 pF C_re prevent breakdown and oscillation under dynamic video load conditions.	Use Scenario: Amplifying RGB or composite video signals in studio-grade monitors requiring wide bandwidth and low distortion. IC Role / Device Role / Timing Role: Linear video output stage transistor delivering 30–100 mA peak current into capacitive CRT loads. Use Value: h_FE ≥ 50 and f_T = 60 MHz ensure faithful reproduction of 5–7 MHz video bandwidth without gain roll-off.
Video Deflection Circuit	Legacy Broadcast Equipment Repair
Use Scenario: Horizontal or vertical deflection driver in analog CRT-based test equipment and oscilloscopes. IC Role / Device Role / Timing Role: High-voltage switch controlling sawtooth current through deflection yoke with fast turn-on/turn-off. Use Value: Low V_CE(sat) ≤ 0.6 V and 100 mA I_CM minimize conduction loss and support repetitive pulse operation.	Use Scenario: Replacement part for discontinued BF422 variants in field-repair of 1990s–2000s broadcast infrastructure. IC Role / Device Role / Timing Role: Direct-fit discrete transistor matching original pinout, voltage rating, and gain profile. Use Value: Identical TO-92 (SOT54) footprint and 250 V/100 mA/1.6 pF specs ensure drop-in mechanical and electrical compatibility.

Colour Television Video Output

Professional Monitor Driver

Use Scenario: Driving CRT grid or cathode in PAL/NTSC broadcast receivers with 200–250 V anode supplies.

IC Role / Device Role / Timing Role: NPN high-voltage switching transistor operating in Class-B linear mode for luminance and chroma signal amplification.

Use Value: 250 V V_CEO and 1.6 pF C_re prevent breakdown and oscillation under dynamic video load conditions.

Use Scenario: Amplifying RGB or composite video signals in studio-grade monitors requiring wide bandwidth and low distortion.

IC Role / Device Role / Timing Role: Linear video output stage transistor delivering 30–100 mA peak current into capacitive CRT loads.

Use Value: h_FE ≥ 50 and f_T = 60 MHz ensure faithful reproduction of 5–7 MHz video bandwidth without gain roll-off.

Video Deflection Circuit

Legacy Broadcast Equipment Repair

Use Scenario: Horizontal or vertical deflection driver in analog CRT-based test equipment and oscilloscopes.

IC Role / Device Role / Timing Role: High-voltage switch controlling sawtooth current through deflection yoke with fast turn-on/turn-off.

Use Value: Low V_CE(sat) ≤ 0.6 V and 100 mA I_CM minimize conduction loss and support repetitive pulse operation.

Use Scenario: Replacement part for discontinued BF422 variants in field-repair of 1990s–2000s broadcast infrastructure.

IC Role / Device Role / Timing Role: Direct-fit discrete transistor matching original pinout, voltage rating, and gain profile.

Use Value: Identical TO-92 (SOT54) footprint and 250 V/100 mA/1.6 pF specs ensure drop-in mechanical and electrical compatibility.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BF420,116	Higher V_CEO/V_CBO (300 V vs. 250 V); otherwise identical pinout, package, and gain specs.	Suitable for designs requiring extra 50 V margin in flyback-derived supplies or transient-prone environments.	Select BF420,116 only if system-level overvoltage stress exceeds 250 V; BF422,116 remains optimal for standard 200–250 V video rails.
BC639,116	Lower V_CEO (80 V), higher I_C (1000 mA), different h_FE range (40–160); same TO-92 package but not voltage-compatible.	Intended for low-voltage switching (e.g., relay drivers), not high-voltage video stages.	Not interchangeable - BC639,116 lacks required 250 V rating and exhibits higher C_re; use only in non-high-voltage contexts.

Compared with BF420,116, the BF422,116 trades 50 V headroom for tighter specification control in legacy video designs; versus BC639,116, it delivers essential high-voltage integrity but lower current capacity - making BF422,116 uniquely suited for CRT video output where voltage, capacitance, and gain stability are co-critical.

Availability

BF422,116 is available at Aetrix Electronics and suitable for colour television repair, professional video monitor manufacturing, and legacy broadcast equipment maintenance requiring stable component supply and long-term obsolescence mitigation.

Supply support for BF422,116 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in high-performance analog, logic, and RF components for industrial, automotive, and consumer electronics.

The BF422,116 belongs to NXP's legacy discrete transistor portfolio designed specifically for analog video signal processing and high-voltage linear amplification in CRT-based systems.

FAQ

What is the maximum collector-emitter voltage rating for BF422,116?

The BF422,116 has a maximum collector-emitter voltage (V_CEO) rating of 250 V under open-base conditions. This rating is verified per IEC 60134 limiting values and applies to continuous DC operation at T_amb ≤ 25 °C. Exceeding this voltage risks irreversible junction breakdown, especially under transient conditions common in CRT flyback circuits.

Is BF422,116 pin-compatible with BF420,116?

Yes, BF422,116 is pin-compatible with BF420,116 - both use identical TO-92 (SOT54) packaging with base-collector-emitter pinning (1-2-3). However, BF420,116 supports 300 V V_CEO, while BF422,116 is rated for 250 V; substituting BF422,116 in a BF420-design requires verification that operating voltage stays within 250 V.

What is the typical feedback capacitance (C_re) of BF422,116 and why does it matter?

The BF422,116 has a maximum feedback capacitance (C_re) of 1.6 pF at V_CE = 30 V and f = 1 MHz. This low value minimizes Miller multiplication in high-gain video amplifiers, preventing instability and oscillation - a critical requirement for maintaining flat frequency response in CRT video output stages.

Can BF422,116 be used in switching power supply applications?

No - BF422,116 is not recommended for switching power supply applications. Its 250 V V_CEO and 100 mA I_CM are insufficient for typical SMPS primary-side switching, and its transition frequency (60 MHz) and saturation characteristics are optimized for linear video amplification, not high-speed PWM switching.

What is the thermal resistance (R_th(j-a)) of BF422,116 and how should it guide PCB layout?

The BF422,116 has a thermal resistance from junction to ambient (R_th(j-a)) of 150 K/W when mounted on a standard PCB. To sustain its 830 mW total power dissipation, designers must allocate adequate copper area around the emitter pad and avoid enclosing the device in thermally isolated zones - especially important in compact video output modules.

BF422,116 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 830 mW

Frequency - Transition:: 60MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BF422,116 FAQ

1.How can I place an order for BF422,116 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF422,116 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 BF422,116 reliable?

The price and inventory of BF422,116 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF422,116 is usually 5 days.

3.What payment methods are accepted for BF422,116?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF422,116 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF422,116?

BF422,116 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF422,116 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 BF422,116?

For technical support, including BF422,116 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF422,116 requirements.

6.How does Aetrix verify that BF422,116 is sourced from the original manufacturer or authorized distributors?

All BF422,116 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 BF422,116 meets industry standards.

7.What is the process for return or replacement of BF422,116?

All BF422,116 units undergo pre-shipment inspection (PSI). If there is an issue with BF422,116, 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 BF422,116 part is unused and in its original packaging.

Return procedure for BF422,116:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…