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

STMicroelectronics STBV45

Name: STBV45
Brand: STMicroelectronics
SKU: STBV45
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STBV45

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: STBV45.pdf

Description:: TRANS NPN 400V 0.75A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:7,477

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Product details

Overview

STBV45 from STMicroelectronics is a high-voltage fast-switching NPN power transistor designed for inductive switching in compact fluorescent lamp (CFL) ballasts and low-power SMPS battery chargers. It features V_CEO = 400 V, I_C = 0.75 A, t_f = 0.3 µs, R_thj-case = 131.6 °C/W, and TO-92 package with halogen-free molding compound.

For engineers reviewing the STBV45 datasheet, STBV45 pinout, STBV45 application, or STBV45 equivalent, key selection criteria include its 400 V sustaining voltage under zero-base drive, sub-microsecond fall time in inductive loads, low V_CE(sat) at 0.2–0.4 A, and thermal performance in through-hole CFL driver designs.

Technical Context

This device uses high-voltage multi-epitaxial planar technology with cellular emitter structure and planar edge termination to simultaneously achieve high RBSOA and fast switching. Its 0.3 µs fall time is measured under standardized inductive load conditions (L = 3 mH, V_clamp = 300 V, I_B1 = –I_B2 = 40 mA).

The STBV45 operates with DC current gain (h_FE) ranging from 5 to 30 depending on bias point (e.g., 12 at I_C = 0.5 mA/V_CE = 2 V; 10 at I_C = 0.2 A/V_CE = 5 V), and supports pulsed collector currents up to 1.5 A for <5 ms durations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Sustaining voltage with open base; defines maximum off-state blocking capability in CFL resonant circuits
t_f	0.3 µs - Measured fall time under 3 mH inductive load; enables high-frequency (>30 kHz) ballast operation
V_CE(sat)	0.2–0.5 V - Saturation voltage across 0.2–0.4 A range; minimizes conduction loss in low-duty-cycle switching
R_thj-case	131.6 °C/W - Junction-to-case thermal resistance; determines heatsink requirement for 0.95 W dissipation at T_c = 25 °C
I_C	0.75 A - Continuous collector current rating; sets maximum RMS current in half-bridge CFL driver legs
h_FE	5–30 - DC current gain variation with operating point; informs base drive design margin for reliable turn-on

Pinout & Package

Package: TO-92 (standard bulk) and TO-92AP (ammopack). Both variants use halogen-free molding compound and comply with ECOPACK® environmental specifications.

Pin/Terminal	Circuit Role	Design Meaning
E	Emitter	Reference node for base drive; connected to ground or low-side return path in CFL half-bridge
B	Base	Control input requiring ~40–135 mA peak drive for full saturation at 0.2–0.4 A collector current
C	Collector	High-voltage switching node; handles 400 V blocking and 0.75 A continuous current in resonant tank interface

Key Features

Feature	Design Value
Cellular emitter + planar edge termination	Enables simultaneous wide RBSOA and 0.3 µs fall time without trade-off between ruggedness and speed
Low dynamic parameter spread	Ensures consistent switching timing and V_CE(sat) across production lots in mass-produced CFL drivers
Halogen-free molding compound	Meets RoHS and JEDEC JESD97 compliance for environmentally regulated lighting and charger applications
ECOPACK® packaging	Lead-free second-level interconnect with marked soldering profile on inner box label for process control

Applications

Compact Fluorescent Lamp (CFL) Ballast

SMPS Battery Charger

Use Scenario: Half-bridge resonant inverter driving 10–30 W fluorescent tube with frequency sweep start.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling primary side of resonant tank; commutated at 30–60 kHz.

Use Value: 400 V V_CEO withstands reflected transients during zero-current switching; 0.3 µs t_f maintains efficiency above 40 kHz.

Use Scenario: Low-cost flyback converter for 5–12 V/1 A wall adapters powering portable electronics.

IC Role / Device Role / Timing Role: Primary-side switching transistor in self-oscillating or discrete PWM-controlled flyback topology.

Use Value: 0.95 W P_TOT and 131.6 °C/W R_thj-case allow operation without heatsink at ambient ≤50 °C.

Electronic Ballast for T5/T8 Lamps

DC-DC Converter in Portable Medical Devices

Use Scenario: Dimmable electronic ballast with analog or digital control interfacing to triac-dimmable input stage.

IC Role / Device Role / Timing Role: Main switching element in series-resonant half-bridge; subjected to repetitive avalanche stress during dimming transitions.

Use Value: Wide RBSOA and low lot-to-lot parameter spread ensure stable dimming performance across production batches.

Use Scenario: Isolated 5 V to ±12 V dual-output DC-DC module for ECG front-end signal conditioning.

IC Role / Device Role / Timing Role: Primary-side switch in low-noise, low-EMI flyback with synchronous rectification secondary.

Use Value: Low V_CE(sat) (0.2 V @ 0.2 A) reduces conduction loss and improves light-load efficiency critical for battery runtime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU2520DX	V_CEO = 1000 V, I_C = 2 A, TO-220 package, higher P_TOT = 125 W	Designed for higher-power CFLs (>40 W) and TV horizontal deflection; requires heatsink	Select when >0.75 A continuous current or >400 V blocking is required; not drop-in due to package and drive differences
2SC4027	V_CEO = 400 V, I_C = 0.5 A, TO-92, t_f = 0.5 µs, h_FE = 60–120	Higher gain but slower switching; used in lower-frequency (<20 kHz) linear-regulated ballasts	Choose for gain-sensitive base-drive-limited designs where 0.3 µs fall time is not mandatory

Compared with BU2520DX and 2SC4027, the STBV45 offers optimal balance of 400 V blocking, 0.3 µs speed, and TO-92 form factor for cost-sensitive <30 W CFL and charger designs-neither over-specified nor under-specified for its target application class.

Availability

STBV45 is available at Aetrix Electronics and suitable for compact fluorescent lamp (CFL) ballasts, SMPS battery chargers, and low-power electronic lighting systems requiring stable component supply and legacy-compatible through-hole packaging.

Supply support for STBV45 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive ICs.

The STBV45 belongs to ST's high-voltage bipolar transistor product line, engineered specifically for energy-efficient lighting and low-power AC/DC conversion where reliability, thermal robustness, and switching speed are co-optimized.

FAQ

Is STBV45 still in active production?

No-STBV45 is an obsolete product per ST's official documentation (marked "Obsolete Product(s)" on all datasheet pages). Aetrix Electronics maintains limited legacy stock for design continuity and repair programs, with full traceability and documented shelf-life verification.

Can STBV45 replace STBV45G in a PCB layout?

Yes-STBV45 and STBV45G share identical TO-92 mechanical dimensions, pinout, and electrical specifications except for halogen-free material content. STBV45G adds ECOPACK® compliance but requires no layout or schematic changes for drop-in substitution.

What is the maximum safe operating frequency for STBV45 in a CFL half-bridge?

Based on measured t_f = 0.3 µs and typical t_r ~0.5 µs, the practical upper limit is ~60 kHz for reliable zero-voltage switching in resonant CFL ballasts. Operation beyond this risks increased switching loss and thermal runaway without active gate control.

Does STBV45 support avalanche energy rating?

No-ST's datasheet does not specify single-pulse or repetitive avalanche energy (E_AS). The device relies on external snubbers or clamping circuits in inductive applications; its RBSOA curve (Figure 2) defines safe operating limits under transient conditions instead.

STBV45 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 750 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 135mA, 400mA

Current - Collector Cutoff (Max):: 250µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 5 @ 400mA, 5V

Power - Max:: 950 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

STBV45 FAQ

1.How can I place an order for STBV45 through Aetrix?

Please submit a Request for Quotation (RFQ) for STBV45 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 STBV45 reliable?

The price and inventory of STBV45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STBV45 is usually 5 days.

3.What payment methods are accepted for STBV45?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STBV45 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STBV45?

STBV45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STBV45 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 STBV45?

For technical support, including STBV45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STBV45 requirements.

6.How does Aetrix verify that STBV45 is sourced from the original manufacturer or authorized distributors?

All STBV45 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 STBV45 meets industry standards.

7.What is the process for return or replacement of STBV45?

All STBV45 units undergo pre-shipment inspection (PSI). If there is an issue with STBV45, 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 STBV45 part is unused and in its original packaging.

Return procedure for STBV45:

1.Submit a request within 90 days.

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

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