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

Nexperia USA Inc. BSP19-QX

Name: BSP19-QX
Brand: Nexperia USA Inc.
SKU: BSP19-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP19-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BSP19-QX.pdf

Description:: TRANS NPN 350V 0.1A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:1,000

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Product details

Overview

BSP19-QX from Nexperia is an NPN high-voltage bipolar junction transistor in SOT223 (SC-73) package, rated for 350 V V_CEO, 100 mA I_C, and DC current gain (h_FE) ≥40 at 20 mA/10 V. It serves as a switching or linear amplification device in high-voltage telephony interface circuits and automotive body control modules requiring AEC-Q101 qualified discrete transistors.

For engineers reviewing the BSP19-QX datasheet, BSP19-QX pinout, BSP19-QX application, or BSP19-QX equivalent, key selection criteria include verified V_CEO = 350 V, thermal resistance R_th(j-sp) = 23 K/W, dual-collector SOT223 pinning, and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

This transistor operates as a single NPN silicon switch with open-base collector-emitter breakdown voltage of 350 V and collector-base rating of 400 V. Its h_FE ≥40 at 20 mA ensures stable current amplification in low-to-moderate drive applications, while f_T = 70 MHz supports medium-frequency signal handling.

Thermal design relies on its solder-point thermal resistance of 23 K/W and 1.2 W total power dissipation at T_amb ≤25 °C on 1 cm² copper pad. The dual-collector (pins 2 & 4) configuration enhances current-handling capability and thermal spreading in surface-mount layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 V - Maximum safe collector-emitter voltage under open-base condition; defines high-side switching headroom in telecom line interfaces.
I_C	100 mA - Continuous collector current limit; sets maximum load drive capacity in relay drivers or LED bias circuits.
h_FE	≥40 @ 20 mA/10 V - Minimum DC current gain; ensures predictable base drive sizing for saturation in switching designs.
V_CE(sat)	≤0.5 V @ 50 mA/4 mA - Low saturation voltage reduces conduction loss and self-heating during on-state operation.
R_th(j-sp)	23 K/W - Junction-to-solder-point thermal resistance; enables accurate thermal modeling when mounted on PCB copper pads.
f_T	70 MHz - Transition frequency; supports small-signal amplification up to mid-VHF range in oscillator or buffer stages.

Pinout & Package

The BSP19-QX uses the SC-73 (SOT223) surface-mount plastic package with 4 leads, 2.3 mm pitch, and 6.5 mm × 3.5 mm × 1.65 mm body dimensions. The exposed collector tab (pins 2 & 4) provides enhanced thermal conduction to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input node; requires current-limited drive to achieve target I_C and avoid overdrive-induced storage delay.
2	Collector	Main high-voltage output terminal; electrically and thermally connected to exposed metal tab for heat sinking.
3	Emitter	Reference node for current flow; tied to ground or low-side return path in common-emitter configurations.
4	Collector	Second collector terminal - paralleled internally with pin 2 to increase current capacity and thermal dissipation area.

Key Features

Feature	Design Value
AEC-Q101 qualified	Stress-tested per automotive discrete semiconductor standard; validated for under-hood and body-control module use.
Dual-collector SOT223	Pins 2 and 4 both connect to collector; improves thermal spreading and current sharing versus single-collector variants.
V_CEO = 350 V	Enables direct interface with 200–300 V telecom line voltages without external voltage clamping.
R_th(j-sp) = 23 K/W	Supports reliable operation at 1.2 W P_tot with minimal heatsink area-ideal for space-constrained automotive PCBs.

Applications

Telephony Line Interface

Automotive Body Control Module

Use Scenario: Driving analog telephone line feed circuits requiring 300 V standoff and transient surge tolerance.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling loop current and polarity reversal in SLIC front-end stages.

Use Value: 350 V V_CEO eliminates need for series Zener clamping; dual-collector layout sustains repeated lightning-induced surges.

Use Scenario: Controlling 12 V/24 V solenoid valves and relays in door lock, window lift, and lighting subsystems.

IC Role / Device Role / Timing Role: Medium-current switching element interfacing microcontroller GPIO to inductive loads via flyback protection.

Use Value: AEC-Q101 qualification ensures long-term reliability across -40 °C to +125 °C ambient; 0.5 V V_CE(sat) minimizes coil heating during PWM duty cycles.

Industrial Power Supply Feedback

AC Mains-Sensing Circuit

Use Scenario: Isolated feedback path in offline flyback converters using optocoupler-driven base drive.

IC Role / Device Role / Timing Role: Linear amplifier stage translating secondary-side error voltage into primary-side PWM controller input.

Use Value: h_FE ≥40 ensures stable closed-loop gain across temperature; 150 °C T_j rating supports operation near transformer hotspots.

Use Scenario: Zero-crossing detection and voltage monitoring in smart energy meters and AC dimmer controls.

IC Role / Device Role / Timing Role: High-impedance, high-voltage sensing switch sampling phase-aligned AC waveform peaks.

Use Value: 400 V V_CBO withstands peak mains transients (e.g., 310 V @ 220 V RMS); low C_c = 2.5 pF preserves timing accuracy.

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
ZTX653	V_CEO = 300 V, h_FE = 100–300, TO-92 package	Lacks AEC-Q101 qualification; lower voltage rating limits use in 300 V telecom lines	Select only for non-automotive, lower-voltage linear amplification where footprint flexibility outweighs qualification needs.
BSP16	V_CEO = 250 V, same SOT223 package, no dual collector	Not qualified to AEC-Q101; insufficient for 350 V surge immunity in automotive gate drivers	Acceptable only in cost-sensitive 24 V industrial controls where 250 V margin is sufficient and thermal demands are lower.

Compared with ZTX653 and BSP16, the BSP19-QX uniquely combines AEC-Q101 qualification, 350 V V_CEO, and dual-collector thermal enhancement-making it the sole choice for automotive and telecom applications demanding simultaneous high voltage, reliability, and board-level thermal performance.

Availability

BSP19-QX is available at Aetrix Electronics and suitable for telephony line interfaces, automotive body control modules, industrial power supply feedback paths, and AC mains-sensing circuits requiring stable component supply across extended product lifecycles.

Supply support for BSP19-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 high-volume, high-reliability essential semiconductors-including logic, discretes, MOSFETs, and ESD protection devices.

The BSP19-QX belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor family, engineered specifically for automotive and industrial applications requiring robustness against voltage transients and thermal stress.

FAQ

What is the maximum allowable junction temperature for BSP19-QX?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in the Absolute Maximum Ratings table. Operation above this threshold risks permanent degradation of h_FE, leakage current, and packaging integrity. Thermal design must ensure T_j remains within this limit under worst-case ambient and power dissipation conditions.

Does BSP19-QX have a built-in base-emitter resistor?

No, BSP19-QX is a standard NPN bipolar transistor without integrated base resistors. External base drive circuitry-including current-limiting resistors-must be provided by the designer to achieve desired I_C and switching speed while avoiding excessive base current beyond the 100 mA I_B absolute maximum rating.

Can BSP19-QX replace BSP17 in existing designs?

Not directly: BSP17 has V_CEO = 300 V and no AEC-Q101 qualification, whereas BSP19-QX offers 350 V rating and automotive qualification. Substitution requires verification of voltage margin, thermal performance, and compliance requirements-especially in safety-critical or automotive applications where qualification status is mandatory.

What is the significance of dual-collector pins (2 and 4) in SOT223?

Pins 2 and 4 are internally connected to the same collector node and share the exposed metal tab. This configuration lowers effective thermal resistance (R_th(j-sp) = 23 K/W), improves current distribution, and increases mechanical robustness during reflow soldering-critical for high-reliability automotive PCB assembly and thermal cycling endurance.

BSP19-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):: 350 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 4mA, 50mA

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 20mA, 10V

Power - Max:: 1.2 W

Frequency - Transition:: 70MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BSP19-QX FAQ

1.How can I place an order for BSP19-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP19-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 BSP19-QX reliable?

The price and inventory of BSP19-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP19-QX is usually 5 days.

3.What payment methods are accepted for BSP19-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP19-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP19-QX?

BSP19-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP19-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 BSP19-QX?

For technical support, including BSP19-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP19-QX requirements.

6.How does Aetrix verify that BSP19-QX is sourced from the original manufacturer or authorized distributors?

All BSP19-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 BSP19-QX meets industry standards.

7.What is the process for return or replacement of BSP19-QX?

All BSP19-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSP19-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 BSP19-QX part is unused and in its original packaging.

Return procedure for BSP19-QX:

1.Submit a request within 90 days.

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

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