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

STMicroelectronics BULT3P3

Name: BULT3P3
Brand: STMicroelectronics
SKU: BULT3P3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BULT3P3

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: BULT3P3.pdf

Description:: TRANS PNP 200V 3A SOT-32-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,402

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Product details

Overview

BULT3P3 from STMicroelectronics is a medium-voltage fast-switching PNP power transistor designed for electronic ballasts in compact fluorescent lamps (CFLs), operating up to −300 V V_CES, delivering −3 A continuous collector current, and achieving 60 ns rise time with 1.2 µs storage time under resistive load conditions.

For engineers reviewing the BULT3P3 datasheet, BULT3P3 pinout, BULT3P3 application, or BULT3P3 equivalent, key selection criteria include its −200 V V_CEO(sus), low R_thJC of 3.9 °C/W, complementary pairing with BULT3N4, and suitability for high-frequency CFL driver topologies requiring robust RBSOA and tight dynamic parameter spread.

Technical Context

The BULT3P3 employs high-voltage multi-epitaxial planar technology with cellular emitter structure and planar edge termination to simultaneously optimize switching speed and ruggedness. Its design targets stable operation under repetitive inductive switching at ≥25 kHz, with specified V_CE(sat) ≤ −0.5 V at I_C = −0.7 A / I_B = −0.1 A and h_FE = 10–36 across I_C = −10 mA to −2 A.

It is expressly co-designed with the NPN complement BULT3N4 for push-pull or half-bridge CFL ballast drivers. The device sustains −200 V under I_C = −10 mA with zero base drive (V_CEO(sus)), and exhibits tightly controlled dynamic parameters-tr ≤ 100 ns, ts ≤ 180 ns, tf ≤ 70 ns-ensuring consistent timing behavior across production lots.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	−300 V: Maximum blocking voltage with base open; enables use in 230 V AC mains-fed CFLs with margin for voltage spikes.
I_C (cont.)	−3 A: Continuous collector current rating; supports lamp power up to ~40 W in standard CFL driver designs.
R_thJC	3.9 °C/W: Junction-to-case thermal resistance; allows 32 W dissipation at T_C = 25 °C with manageable heatsinking.
t_r / t_f	60 ns / 100 ns (resistive): Fast switching enables >25 kHz operation while minimizing switching losses in resonant ballast circuits.
h_FE	10–36: DC current gain range across I_C = 10 mA–2 A; ensures reliable base drive design across temperature and process variation.
V_CE(sat)	≤ −0.5 V @ I_C = −0.7 A, I_B = −0.1 A: Low saturation voltage reduces conduction loss and improves efficiency in hard-switched topologies.

Pinout & Package

SOT-32 (TO-220AB) package: insulated case, vertical mounting, 3-pin through-hole configuration with metal tab electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitting terminal for PNP current flow	Connected to positive rail in common-emitter CFL driver; requires low-inductance layout to minimize switching overshoot.
2 (Base)	Control electrode for minority-carrier injection	Driven by dedicated base driver IC or transformer-coupled network; −1.5 A max base current supports fast turn-on/turn-off.
3 (Collector / Tab)	Main current path and thermal interface	Collector tied to metal tab for direct heatsink mounting; electrically active-requires isolation when mounted to chassis.

Key Features

Feature	Design Value
Low dynamic parameter spread	Tight lot-to-lot consistency in t_r, t_s, t_f, and V_CE(sat) ensures predictable timing and thermal behavior across mass production.
Wide RBSOA	Robust secondary breakdown immunity enables safe operation under inductive switching stress without snubber networks.
Cellular emitter + planar termination	Enables simultaneous high-speed switching and high-voltage capability-unachievable with conventional planar or mesa structures.
ECOPACK® compliant	Meets RoHS and halogen-free requirements per ST's environmental packaging standards for lighting applications.

Applications

Compact Fluorescent Lamp (CFL) Ballast

LED Driver with Boost-PFC Stage

Use Scenario: High-frequency (25–65 kHz) electronic ballast driving 18–36 W T8/T5 fluorescent tubes in commercial lighting fixtures.

IC Role / Device Role / Timing Role: Main switching transistor in half-bridge topology; handles high dv/dt and repetitive avalanche stress during resonant ignition and steady-state operation.

Use Value: −200 V V_CEO(sus) and 1.2 µs t_s ensure reliable lamp starting and flicker-free operation without external clamping.

Use Scenario: Primary-side switch in boost power factor correction (PFC) stage powering high-bay LED luminaires from 230 V AC mains.

IC Role / Device Role / Timing Role: Medium-voltage PNP switch replacing MOSFETs in cost-sensitive industrial LED drivers where gate drive simplicity and avalanche ruggedness are prioritized.

Use Value: Cellular emitter structure delivers lower E_off than comparable bipolar transistors, reducing thermal stress in continuous conduction mode (CCM) PFC.

DC-DC Converter for Industrial Sensors

Ignition Circuit for Gas Discharge Lamps

Use Scenario: Isolated flyback converter supplying 12 V/500 mA to analog sensor modules in factory automation systems with 48 V DC input.

IC Role / Device Role / Timing Role: Primary switch operating at 100 kHz with 50% duty cycle; subjected to 150 V reflected output voltage plus leakage spike.

Use Value: −300 V V_CES and 3.9 °C/W R_thJC allow full-load operation without forced air cooling in sealed enclosures.

Use Scenario: Series-pass switch in high-voltage pulse generator for xenon flash tubes or sodium-vapor lamp igniters.

IC Role / Device Role / Timing Role: Fast-turn-off switch controlling energy dump into ignition transformer primary; triggered by microcontroller with precise timing control.

Use Value: 70 ns t_f (inductive load) enables sub-microsecond current cutoff, ensuring repeatable high-voltage pulse amplitude and timing jitter < 50 ns.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU508A	Higher V_CES (−1500 V) but slower switching (t_r ≈ 500 ns); TO-3 package; no ECOPACK® compliance.	Designed for CRT flyback and HV capacitor charging-not optimized for high-frequency CFL ballasts.	Choose only if extreme voltage margin (>1 kV) outweighs efficiency and size penalties.
MJE13005	Lower V_CES (−400 V), higher I_C (−12 A), but wider h_FE spread (8–40); TO-220 non-insulated package.	Targeted at general-purpose SMPS and motor control-not characterized for CFL RBSOA or dynamic parameter consistency.	Acceptable for non-critical 20–30 kHz converters where timing precision and lot uniformity are not required.

Compared with BU508A and MJE13005, the BULT3P3 offers uniquely tight dynamic parameter control and optimized RBSOA for CFL ballast reliability, while maintaining SOT-32 compatibility and ECOPACK® compliance-making it the preferred choice for volume lighting OEMs requiring long-term supply stability and design repeatability.

Availability

BULT3P3 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, industrial DC-DC converters, gas discharge lamp igniters, and LED driver PFC stages requiring stable component supply and long-lifecycle support.

Supply support for BULT3P3 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 discrete devices, microcontrollers, sensors, and automotive ICs.

The BULT3P3 belongs to ST's high-voltage bipolar transistor family engineered specifically for energy-efficient lighting systems, emphasizing switching speed, ruggedness, and manufacturing consistency in consumer and industrial lighting applications.

FAQ

Is the BULT3P3 pin-compatible with the BULT3N4?

No-the BULT3P3 (PNP) and BULT3N4 (NPN) share the same SOT-32 package footprint and complementary electrical ratings, but their pinouts are mirror-symmetric: BULT3P3 has emitter-base-collector on pins 1-2-3, while BULT3N4 has collector-base-emitter on pins 1-2-3. Direct substitution without PCB redesign is not possible.

Can the BULT3P3 be used in avalanche mode?

Yes-the device is characterized for repetitive avalanche operation with V_CEO(sus) = −200 V at I_C = −10 mA and specified t_s/t_f under inductive load conditions. However, ST does not guarantee single-pulse avalanche energy (E_AS) ratings; derating and thermal monitoring are required for sustained avalanche use.

What is the maximum recommended case temperature for continuous operation?

The absolute maximum junction temperature is 150 °C, and R_thJC is 3.9 °C/W. For continuous 32 W dissipation, the case temperature must remain ≤ 25 °C. In practice, with realistic heatsinking (R_thCS + R_thSA ≈ 10 °C/W), maximum allowable case temperature is 95 °C to maintain T_J ≤ 135 °C for 10-year reliability.

Does the BULT3P3 require a base resistor in series with the driver?

Yes-a base resistor is mandatory to limit peak base current to ≤ −3 A (IBM) and ensure controlled turn-on/turn-off. Typical values range from 10 Ω to 47 Ω depending on driver strength and desired switching speed; omission risks second breakdown due to localized emitter current crowding during transition.

BULT3P3 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 3 A

Voltage - Collector Emitter Breakdown (Max):: 200 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 200mA, 1A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10 @ 10mA, 5V

Power - Max:: 32 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-32-3

BULT3P3 FAQ

1.How can I place an order for BULT3P3 through Aetrix?

Please submit a Request for Quotation (RFQ) for BULT3P3 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 BULT3P3 reliable?

The price and inventory of BULT3P3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BULT3P3 is usually 5 days.

3.What payment methods are accepted for BULT3P3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BULT3P3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BULT3P3?

BULT3P3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BULT3P3 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 BULT3P3?

For technical support, including BULT3P3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BULT3P3 requirements.

6.How does Aetrix verify that BULT3P3 is sourced from the original manufacturer or authorized distributors?

All BULT3P3 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 BULT3P3 meets industry standards.

7.What is the process for return or replacement of BULT3P3?

All BULT3P3 units undergo pre-shipment inspection (PSI). If there is an issue with BULT3P3, 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 BULT3P3 part is unused and in its original packaging.

Return procedure for BULT3P3:

1.Submit a request within 90 days.

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

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