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

Nexperia USA Inc. BF720-QX

Name: BF720-QX
Brand: Nexperia USA Inc.
SKU: BF720-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF720-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: BF720-QX.pdf

Description:: TRANS NPN 300V 0.1A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:1,000

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Product details

Overview

BF720-QX from Nexperia is an AEC-Q101-qualified NPN high-voltage transistor in SOT223 (SC-73) package, rated for 300 V V_CEO, 100 mA I_C, and 60 MHz f_T, with low 1.6 pF feedback capacitance. It serves as a robust switching element in automotive high-voltage bias, ignition interface, and LED driver circuits where voltage standoff and thermal reliability are critical.

For engineers reviewing the BF720-QX datasheet, BF720-QX pinout, BF720-QX application, or BF720-QX equivalent, key selection criteria include verified 300 V collector-emitter breakdown, AEC-Q101 qualification status, SOT223 thermal resistance (R_th(j-sp) = 25 K/W), DC current gain (h_FE ≥ 50 at 25 mA), and low Cre for high-frequency stability.

Technical Context

This discrete NPN bipolar junction transistor operates in linear or saturated switching mode with open-base V_CEO = 300 V and peak collector current I_CM = 200 mA. Its f_T = 60 MHz and C_re = 1.6 pF support stable operation in medium-frequency HV switching applications up to ~10 MHz.

Thermal design relies on the SOT223 package's exposed collector pad: R_th(j-a) = 106 K/W (PCB-mounted, 1 cm² copper) and R_th(j-sp) = 25 K/W enable 1.2 W P_tot dissipation at T_amb ≤ 25 °C - critical for under-hood automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - supports primary-side switching in 24 V/48 V automotive systems with 2× safety margin against transients
I_C	100 mA continuous - suitable for driving small solenoids, relays, or gate resistors in HV MOSFET interfaces
h_FE	≥50 at V_CE = 20 V, I_C = 25 mA - ensures reliable base drive efficiency in low-power control stages
C_re	1.6 pF - minimizes Miller effect, enabling clean turn-off in fast-switching HV loads
f_T	60 MHz - validates usable bandwidth for PWM frequencies up to 1–2 MHz with margin
R_th(j-sp)	25 K/W - enables direct thermal coupling to PCB copper, reducing junction temperature rise by >40 K vs. standard SOT23
V_CE(sat)	≤0.6 V at I_C = 30 mA, I_B = 5 mA - limits conduction loss to <18 mW in saturated switch mode

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and thermally enhanced exposed collector pad (pins 2 and 4).

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input; requires current-limited drive (I_BM ≤ 100 mA peak) to avoid saturation delay
2	Collector (C)	Main high-voltage output node; electrically and thermally connected to exposed pad for heatsinking
3	Emiter (E)	Reference return path; must be low-inductance connection to minimize switching noise
4	Collector (C)	Duplicate collector terminal - tied internally to pin 2; used for mechanical stability and dual thermal paths

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive under-hood use per stress test standard, including temperature cycling and HTRB
Low feedback capacitance	1.6 pF Cre reduces unwanted coupling in high-dV/dt environments (e.g., ignition coil drivers)
Enhanced thermal performance	R_th(j-sp) = 25 K/W enables 1.2 W power handling without external heatsink on standard FR4
High voltage rating	300 V V_CEO and V_CBO supports 24 V/48 V bus designs with ISO 7637-2 pulse immunity margin

Applications

Automotive Ignition Interface

LED Driver Bias Circuit

Use Scenario: Switching signal from microcontroller to primary winding of ignition coil in 12 V gasoline engine ECUs.

IC Role / Device Role / Timing Role: High-voltage NPN switch amplifying logic-level pulses into 300 V-capable collector current pulses.

Use Value: 300 V V_CEO withstands coil flyback spikes; low Cre prevents false triggering during rapid dV/dt transitions.

Use Scenario: Constant-current bias control for high-brightness LED strings in automotive lighting modules.

IC Role / Device Role / Timing Role: Linear current regulator using emitter degeneration resistor, operating in active region.

Use Value: h_FE ≥ 50 ensures stable current setpoint over temperature; 1.2 W P_tot supports 100 mA at 12 V drop without derating.

Industrial Sensor Power Switch

Relay Driver Interface

Use Scenario: Isolated 24 V sensor supply enable/disable in factory automation PLC I/O modules.

IC Role / Device Role / Timing Role: High-side or low-side switch controlling power rail to analog sensors with transient protection.

Use Value: V_CEO = 300 V accommodates 24 V + 100 V surge; AEC-Q101 grade assures long-term reliability in industrial ambient.

Use Scenario: Driving electromagnetic relay coils in automotive body control modules (BCM).

IC Role / Device Role / Timing Role: Saturated switch providing 100 mA coil current with minimal V_CE(sat) loss.

Use Value: V_CE(sat) ≤ 0.6 V limits power dissipation to <60 mW; dual collector pins improve solder joint reliability.

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
BC817-40-Q	V_CEO = 45 V, h_FE = 250–630, SOT23 package	Lacks 300 V rating; unsuitable for ignition or 24 V+ transient-prone rails	Select only for low-voltage (<50 V), high-gain linear amplification where voltage margin is not required.
BF723-Q	PNP complement; identical V_CEO, I_C, and thermal specs; mirrored polarity	Used in complementary push-pull or high-side switch configurations requiring matched characteristics	Choose when designing symmetric HV driver stages or level-shifting circuits needing matched NPN/PNP pairs.

Compared with BC817-40-Q and BF723-Q, the BF720-QX uniquely delivers 300 V capability in automotive-qualified SOT223, making it irreplaceable in primary-side ignition and 24 V+ transient-tolerant switching - whereas BC817-40-Q is limited to low-voltage apps, and BF723-Q serves only complementary roles.

Availability

BF720-QX is available at Aetrix Electronics and suitable for automotive ignition interfaces, LED driver bias circuits, industrial sensor power switches, and relay driver interfaces requiring stable component supply across production lifecycles.

Supply support for BF720-QX 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 essential efficiency technologies, delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The BF720-QX belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered specifically for robust switching in automotive power management and interface circuits where voltage endurance and thermal resilience are mandatory.

FAQ

Is BF720-QX pin-compatible with standard SOT223 NPN transistors?

Yes - BF720-QX uses the standard SC-73 (SOT223) footprint with pin 1 = Base, pins 2 & 4 = Collector (tied internally), and pin 3 = Emitter. Its mechanical dimensions and land pattern match JEDEC MO-178, enabling drop-in replacement in existing SOT223 layouts designed for 4-lead variants.

What is the maximum allowable PCB copper area for optimal thermal performance?

For rated 1.2 W power dissipation, Nexperia specifies a minimum 1 cm² single-sided, tin-plated copper pad connected to pins 2 and 4. Increasing pad area beyond 1 cm² yields diminishing returns; thermal simulation shows <5 K additional junction-to-ambient reduction beyond 2 cm².

Does BF720-QX support pulsed operation above 100 mA?

Yes - its I_CM (peak collector current) is rated at 200 mA. Operation at 150–200 mA is permitted for pulse widths ≤100 µs and duty cycles ≤1%, provided average power remains within 1.2 W and junction temperature stays below 150 °C.

Can BF720-QX replace older BF720 variants without redesign?

Yes - BF720-QX supersedes prior BF720 versions with identical electrical specs, pinout, and package. The "-QX" suffix denotes updated AEC-Q101 qualification and enhanced process control; no layout or schematic changes are needed for migration from legacy BF720 parts.

BF720-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 300 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:: 1.2 W

Frequency - Transition:: 60MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BF720-QX FAQ

1.How can I place an order for BF720-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BF720-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 BF720-QX reliable?

The price and inventory of BF720-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF720-QX is usually 5 days.

3.What payment methods are accepted for BF720-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF720-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF720-QX?

BF720-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF720-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 BF720-QX?

For technical support, including BF720-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF720-QX requirements.

6.How does Aetrix verify that BF720-QX is sourced from the original manufacturer or authorized distributors?

All BF720-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 BF720-QX meets industry standards.

7.What is the process for return or replacement of BF720-QX?

All BF720-QX units undergo pre-shipment inspection (PSI). If there is an issue with BF720-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 BF720-QX part is unused and in its original packaging.

Return procedure for BF720-QX:

1.Submit a request within 90 days.

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

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