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

Nexperia USA Inc. BSP19,115

Name: BSP19,115
Brand: Nexperia USA Inc.
SKU: BSP19,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSP19,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BSP19,115.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSP19 from Nexperia is an NPN high-voltage transistor in SOT223 (SC-73) package, rated for 350 V V_CEO, 100 mA I_C, and 1.2 W P_tot at T_amb ≤ 25 °C. It serves as a switching or amplification device in telephony line interface circuits and automotive non-safety-critical power control modules where high breakdown voltage and moderate current handling are required.

For engineers reviewing the BSP19 datasheet, BSP19 pinout, BSP19 application, or BSP19 equivalent, key selection criteria include verified V_CEO = 350 V, h_FE ≥ 40 at 20 mA, R_th(j-sp) = 23 K/W, and dual-collector SOT223 thermal pad configuration for enhanced heat dissipation in space-constrained PCB layouts.

Technical Context

This discrete NPN bipolar junction transistor operates with open-base collector-emitter breakdown up to 350 V and supports DC switching with saturation voltage of 0.5 V at I_C = 50 mA / I_B = 4 mA. Its f_T = 70 MHz enables use in medium-frequency signal amplification.

The device features two collector terminals (pins 2 and 4) bonded internally to a common thermal pad, enabling improved thermal transfer to the PCB copper area. Cutoff currents are tightly specified: I_CBO ≤ 20 nA at V_CB = 300 V and I_EBO ≤ 100 nA at V_EB = 5 V, supporting stable operation in high-impedance bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 V - Maximum safe collector-emitter voltage with base open; defines upper limit for off-state blocking in relay drivers or telephone ring detection.
I_C	100 mA - Continuous collector current rating; sets maximum load drive capability in low-power switching applications.
h_FE	≥40 at V_CE = 10 V, I_C = 20 mA - Minimum DC current gain; ensures reliable base-driven switching with ≤5 mA base current for full turn-on.
V_CE(sat)	≤0.5 V at I_C = 50 mA, I_B = 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 predictable temperature rise when mounted on 1 cm² copper pad.
f_T	70 MHz - Transition frequency; supports linear amplification up to ~10 MHz with acceptable gain margin.

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, and integrated thermal pad connected to pins 2 and 4 (both collectors). Dimensions: 6.5 mm × 3.5 mm × 1.65 mm body; mounting pad for collector occupies 1 cm² on single-sided tinplated PCB.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased B-E junction; requires current-limited drive to achieve target I_C.
2	Collector	Main high-voltage output terminal; electrically and thermally tied to pin 4 for parallel current handling and thermal spreading.
3	Emitter	Reference terminal for B-E and C-E junctions; connects to ground or low-side return path in common-emitter configurations.
4	Collector	Second collector terminal, internally bonded to pin 2; used for enhanced thermal coupling to PCB copper area.

Key Features

Feature	Design Value
Dual-collector thermal design	Pins 2 and 4 share internal collector connection and solder-pad thermal path, reducing R_th(j-a) to 104 K/W on standard PCB.
High-voltage blocking	V_CEO = 350 V and V_CBO = 400 V support direct interface with telephone line ringing (≈90 V RMS, 130 V peak) and automotive 24 V/42 V systems.
Low leakage performance	I_CBO ≤ 20 nA at 300 V ensures minimal standby current in always-on telephony supervision circuits.
Stable gain at operating point	h_FE ≥ 40 guaranteed at V_CE = 10 V, I_C = 20 mA - enables predictable biasing without gain spread compensation.

Applications

Telephone Line Interface

Automotive Door Module Control

Use Scenario: Supervision of analog PSTN line status (on-hook/off-hook, ring detection) in VoIP gateways and PBX systems.

IC Role / Device Role / Timing Role: High-voltage NPN switch amplifying line voltage changes while blocking >300 V transients.

Use Value: V_CEO = 350 V withstands ring voltage surges; low I_CBO prevents false triggering during idle line monitoring.

Use Scenario: Driving small solenoids and LED indicators in vehicle door latch and mirror control units.

IC Role / Device Role / Timing Role: Medium-current discrete switch replacing logic-level MOSFETs in 12 V/24 V battery-fed subsystems.

Use Value: Dual-collector SOT223 layout improves thermal reliability under intermittent 100 mA loads; V_CEO margin accommodates load dump spikes.

Industrial AC Zero-Crossing Detection

Legacy CRT Monitor Flyback Driver

Use Scenario: Isolated zero-crossing sensing in solid-state relays using optocoupler input stage.

IC Role / Device Role / Timing Role: High-voltage level-shifting transistor converting rectified AC waveform to logic-compatible pulses.

Use Value: 350 V V_CEO safely handles 230 VAC mains peaks (≈325 V); f_T = 70 MHz preserves edge fidelity for timing accuracy.

Use Scenario: Horizontal deflection timing switch in analog CRT displays requiring fast turn-off and high-voltage flyback recovery.

IC Role / Device Role / Timing Role: High-voltage switching transistor in flyback transformer primary drive circuit.

Use Value: V_CBO = 400 V exceeds typical flyback spike voltages; low V_CE(sat) minimizes conduction loss during active scan period.

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
BCP56-10,115	V_CEO = 80 V, I_C = 1 A, h_FE = 63–160 - lower voltage, higher current, higher gain	Not suitable for >100 V blocking; preferred in 24 V industrial I/O where gain stability and current drive dominate	Select only if system voltage remains ≤80 V and higher h_FE simplifies base drive design
BUV27	V_CEO = 450 V, I_C = 2 A, TO-126 package - higher voltage/current, through-hole, no dual-collector thermal pad	Used in legacy flyback supplies and audio output stages requiring >1 A; lacks SMT thermal optimization of SOT223	Choose when board space allows TO-126 and thermal management relies on heatsink rather than PCB copper

Compared with BCP56-10,115 and BUV27, the BSP19 uniquely balances 350 V blocking, SOT223 surface-mount thermal efficiency, and dual-collector layout-making it optimal for modern telephony interfaces and compact automotive modules where voltage margin and PCB-area-constrained cooling are critical.

Availability

BSP19 is available at Aetrix Electronics and suitable for telephone line interface circuits, automotive door module controls, industrial zero-crossing detectors, and legacy CRT flyback drivers requiring stable component supply and long-term obsolescence resilience.

Supply support for BSP19 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.

The BSP19 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust switching and amplification in telephony infrastructure, automotive body electronics, and industrial power interface applications.

FAQ

Is BSP19 qualified for automotive applications?

No. The BSP19 is explicitly marked as non-automotive qualified per Nexperia's revision history (v.4, 20241008). It lacks AEC-Q101 qualification and is not tested to automotive temperature cycling, humidity, or vibration standards. For automotive use, Nexperia recommends BSP19-Q series variants or other AEC-Q101-certified alternatives.

What is the function of pin 4 on BSP19?

Pin 4 is a second collector terminal, internally bonded to pin 2. Both pins connect to the same collector node and share the thermal pad. This dual-collector configuration enhances thermal conduction to the PCB and supports higher pulsed current handling without increasing junction temperature beyond safe limits.

Can BSP19 replace BC817 in a 24 V switching circuit?

Only if voltage stress remains below 350 V and thermal design accounts for lower gain (h_FE ≥ 40 vs. BC817's ≥ 100). BSP19 offers superior voltage rating but reduced current gain and higher V_CE(sat); redesign of base drive and thermal layout is required to maintain reliability and switching speed.

What is the recommended PCB footprint for BSP19?

The official reflow footprint (Fig. 2) specifies a 1 cm² copper pad for the thermal pad (pins 2 and 4), with solder lands sized per SC-73 outline: 6.15 mm × 3.85 mm for main pad, plus defined solder resist openings. Use single-sided, tin-plated copper; avoid thermal relief on collector pads to preserve R_th(j-sp) = 23 K/W performance.

BSP19,115 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

BSP19,115 FAQ

1.How can I place an order for BSP19,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSP19,115 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 BSP19,115 reliable?

The price and inventory of BSP19,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP19,115 is usually 5 days.

3.What payment methods are accepted for BSP19,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP19,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSP19,115?

BSP19,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSP19,115 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 BSP19,115?

For technical support, including BSP19,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP19,115 requirements.

6.How does Aetrix verify that BSP19,115 is sourced from the original manufacturer or authorized distributors?

All BSP19,115 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 BSP19,115 meets industry standards.

7.What is the process for return or replacement of BSP19,115?

All BSP19,115 units undergo pre-shipment inspection (PSI). If there is an issue with BSP19,115, 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 BSP19,115 part is unused and in its original packaging.

Return procedure for BSP19,115:

1.Submit a request within 90 days.

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

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