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

onsemi BSV52

Name: BSV52
Brand: onsemi
SKU: BSV52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSV52

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BSV52.pdf

Description:: TRANS NPN 12V 0.2A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSV52 from ON Semiconductor is an NPN switching transistor optimized for high-speed saturated switching at collector currents from 10 mA to 100 mA, with V_CEO = 12 V, f_T = 400 MHz, and t_off = 18 ns. It is fabricated in Process 21 and commonly used in low-power digital logic interface, LED driver, and pulse generation circuits.

For engineers reviewing the BSV52 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package, 200 mA I_C rating, low V_CE(sat) (0.25 V @ I_C=10 mA/I_B=1.0 mA), fast switching times, and guaranteed operation from –55°C to +150°C.

Technical Context

The BSV52 employs a planar epitaxial structure optimized for speed and saturation performance in low-voltage, medium-current switching applications. Its design emphasizes minimal storage time (t_s = 13 ns) and low base-emitter saturation voltage (V_BE(sat) = 0.7 V @ I_C=10 mA/I_B=1.0 mA), enabling efficient drive in TTL/CMOS-compatible interfaces.

Thermal performance is defined by R_θJA = 556°C/W on FR-4 PCB (40 mm × 40 mm × 1.5 mm), with maximum power dissipation of 225 mW at 25°C derating at 1.8 mW/°C above ambient - supporting reliable operation in compact, unheatsinked layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	12 V - Maximum safe collector-emitter voltage under open-base conditions; defines rail compatibility in 3.3 V/5 V logic-driven switches.
f_T	400 MHz - Transition frequency confirming suitability for RF-coupled switching and >10 MHz digital signal routing without gain collapse.
t_off	18 ns - Turn-off delay under standardized 3 V supply, 10 mA load, and 3 mA/1.5 mA base drive; enables sub-50 ns pulse shaping.
V_CE(sat)	0.25 V @ I_C=10 mA/I_B=1.0 mA - Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching.
h_FE	40 @ I_C=10 mA/V_CE=1.0 V - DC current gain sufficient for direct CMOS/TTL drive without external base amplification.
R_θJA	556 °C/W - Junction-to-ambient thermal resistance on standard FR-4 board; sets practical max continuous I_C at ~120 mA in still air.

Pinout & Package

SOT-23 plastic surface-mount package (3-pin, 1.3 mm × 2.9 mm × 1.0 mm), marked "B2", with standard emitter-collector-base pinout (Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; polarity defines NPN topology and dictates common-emitter configuration.
Pin 2 (Base)	Control input	Receives TTL/CMOS-level drive current (e.g., 1–5 mA); requires series resistor to limit I_B and ensure saturation.
Pin 3 (Collector)	Switched output node	Connects to load (e.g., LED anode, relay coil, logic input); voltage swing limited to ≤12 V relative to emitter.

Key Features

Feature	Design Value
High-speed switching	13 ns storage time and 18 ns turn-off enable clean 20+ MHz square-wave generation in gate drivers and pulse modulators.
Low V_CE(sat)	0.25 V at I_C/I_B = 10/1 mA reduces power loss to <2.5 mW per switch event, critical for battery-powered logic interfaces.
Wide temperature range	–55°C to +150°C operating junction range supports automotive under-hood, industrial PLC, and outdoor sensor node deployment.
SOT-23 footprint	Standardized 3-pin package allows drop-in replacement in space-constrained PCBs and compatibility with automated pick-and-place assembly.

Applications

Digital Logic Level Shifting	LED Driver Switching
Use Scenario: Interfacing 3.3 V microcontroller GPIO to 5 V legacy logic inputs requiring active pull-down. IC Role / Device Role / Timing Role: NPN switch configured as level-shifting inverter with fast edge control. Use Value: 12 ns turn-on and 18 ns turn-off ensure timing compliance with 25 MHz SPI clock edges and eliminate metastability in bus arbitration.	Use Scenario: Driving multiplexed indicator LEDs in portable instrumentation with duty-cycled brightness control. IC Role / Device Role / Timing Role: Low-loss saturated switch enabling PWM dimming up to 10 kHz without thermal throttling. Use Value: 0.25 V V_CE(sat) limits power dissipation to <2.5 mW at 10 mA, preserving battery life and preventing LED color shift.
Pulse Generator Output Stage	Relay Coil Driver
Use Scenario: Final-stage buffer in a precision pulse generator delivering 10–100 ns pulses to test equipment inputs. IC Role / Device Role / Timing Role: Fast-switching emitter-follower or common-emitter amplifier stage shaping rise/fall times. Use Value: 400 MHz f_T and 12 ns t_on support sub-10 ns edge fidelity into 50 Ω loads when properly terminated.	Use Scenario: Driving 12 V, 40 mA reed relay coils in HVAC control panels with microcontroller outputs. IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic and inductive load. Use Value: 200 mA I_C rating and 12 V V_CEO safely handle relay back-EMF spikes up to 20 V with flyback diode protection.

Digital Logic Level Shifting

LED Driver Switching

Use Scenario: Interfacing 3.3 V microcontroller GPIO to 5 V legacy logic inputs requiring active pull-down.

IC Role / Device Role / Timing Role: NPN switch configured as level-shifting inverter with fast edge control.

Use Value: 12 ns turn-on and 18 ns turn-off ensure timing compliance with 25 MHz SPI clock edges and eliminate metastability in bus arbitration.

Use Scenario: Driving multiplexed indicator LEDs in portable instrumentation with duty-cycled brightness control.

IC Role / Device Role / Timing Role: Low-loss saturated switch enabling PWM dimming up to 10 kHz without thermal throttling.

Use Value: 0.25 V V_CE(sat) limits power dissipation to <2.5 mW at 10 mA, preserving battery life and preventing LED color shift.

Pulse Generator Output Stage

Relay Coil Driver

Use Scenario: Final-stage buffer in a precision pulse generator delivering 10–100 ns pulses to test equipment inputs.

IC Role / Device Role / Timing Role: Fast-switching emitter-follower or common-emitter amplifier stage shaping rise/fall times.

Use Value: 400 MHz f_T and 12 ns t_on support sub-10 ns edge fidelity into 50 Ω loads when properly terminated.

Use Scenario: Driving 12 V, 40 mA reed relay coils in HVAC control panels with microcontroller outputs.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic and inductive load.

Use Value: 200 mA I_C rating and 12 V V_CEO safely handle relay back-EMF spikes up to 20 V with flyback diode protection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT2222A	V_CEO = 40 V, f_T = 300 MHz, t_off = 300 ns - higher voltage rating but slower switching.	Better suited for general-purpose 12–24 V switching where speed is secondary to breakdown margin.	Select BSV52 over MMBT2222A when sub-20 ns off-time and 400 MHz f_T are required for high-frequency digital interfacing.
BC846B	V_CEO = 65 V, h_FE = 200–450 @ I_C=10 mA, t_off = 200 ns - higher gain but significantly slower.	Preferred for linear amplification or low-speed logic buffering where gain stability matters more than speed.	Choose BSV52 instead of BC846B when designing for <50 ns pulse widths, high-speed data lines, or minimal propagation delay in feedback paths.

Compared with MMBT2222A and BC846B, the BSV52 delivers superior high-frequency switching performance (400 MHz f_T, 18 ns t_off) at the expense of lower V_CEO; it is purpose-built for speed-critical, low-voltage (<12 V) saturated switching rather than general-purpose amplification or high-voltage tolerance.

Availability

BSV52 is available at Aetrix Electronics and suitable for digital logic interfacing, LED driver circuits, pulse generation, and relay control applications requiring stable component supply across industrial, automotive, and consumer electronics production programs.

Supply support for BSV52 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The BSV52 belongs to ON Semiconductor's legacy high-speed bipolar transistor product line, originally developed by Fairchild Semiconductor and optimized for fast, low-loss saturated switching in compact SOT-23 packages.

FAQ

What is the maximum collector current rating for the BSV52?

The BSV52 has a continuous collector current rating (I_C) of 200 mA at T_A = 25°C. This value is derated above 25°C at 1.8 mW/°C due to its thermal resistance of 556°C/W. At 85°C ambient, the practical I_C limit drops to approximately 120 mA to maintain junction temperature below 150°C. The BSV52 datasheet specifies this absolute maximum under steady-state conditions.

Does the BSV52 support operation at elevated temperatures?

Yes, the BSV52 is rated for junction temperatures from –55°C to +150°C, making it suitable for under-hood automotive, industrial control, and outdoor embedded systems. Its electrical characteristics - including h_FE, V_CE(sat), and switching times - are specified at 25°C but remain functional across the full range. For example, h_FE decreases to ~25 at 125°C (I_C=10 mA), and V_CE(sat) increases modestly to 0.4 V, both confirmed in the BSV52 typical characteristics curves.

What is the pin configuration of the BSV52 in the SOT-23 package?

The BSV52 uses standard SOT-23 pinout: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector - verified by ON Semiconductor's official package drawing and test circuit diagrams. This matches JEDEC MO-203AB and is consistent across all SOT-23-marked variants (marking "B2"). No alternate pinouts or variants exist for the BSV52; incorrect orientation results in reverse-biased operation and failure to switch.

Can the BSV52 be used as a direct replacement for the MMBT2222A?

No - the BSV52 is not a direct replacement for the MMBT2222A due to significant differences in voltage rating (V_CEO = 12 V vs. 40 V) and switching speed (t_off = 18 ns vs. ~300 ns). While both are SOT-23 NPN transistors, substituting BSV52 in a 24 V relay driver designed for MMBT2222A risks catastrophic breakdown. The BSV52 should only replace MMBT2222A in verified low-voltage (<12 V), high-speed applications with appropriate layout review.

What is the transition frequency (f_T) of the BSV52 and how is it measured?

The BSV52 has a minimum transition frequency (f_T) of 400 MHz, measured at I_C = 10 mA, V_CE = 10 V, and f = 100 MHz per the official ON Semiconductor datasheet. This parameter reflects the frequency at which small-signal current gain drops to unity and confirms the device's capability for RF-coupled switching and high-speed digital edge control - critical for applications like pulse generators and clock buffers where bandwidth exceeds 100 MHz.

BSV52 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 12 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 10mA, 1V

Power - Max:: 225 mW

Frequency - Transition:: 400MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BSV52 FAQ

1.How can I place an order for BSV52 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSV52 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 BSV52 reliable?

The price and inventory of BSV52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSV52 is usually 5 days.

3.What payment methods are accepted for BSV52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSV52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSV52?

BSV52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSV52 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 BSV52?

For technical support, including BSV52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSV52 requirements.

6.How does Aetrix verify that BSV52 is sourced from the original manufacturer or authorized distributors?

All BSV52 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 BSV52 meets industry standards.

7.What is the process for return or replacement of BSV52?

All BSV52 units undergo pre-shipment inspection (PSI). If there is an issue with BSV52, 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 BSV52 part is unused and in its original packaging.

Return procedure for BSV52:

1.Submit a request within 90 days.

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

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