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

STMicroelectronics BUL58D

Name: BUL58D
Brand: STMicroelectronics
SKU: BUL58D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUL58D

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BUL58D.pdf

Description:: TRANS NPN 450V 8A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:7,581

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Product details

Overview

BUL58D from STMicroelectronics is a high-voltage fast-switching NPN power transistor in TO-220 package, rated for 800 V V_CES, 8 A I_C, and 85 W P_tot at T_c = 25 °C, with integrated antiparallel collector-emitter diode and fully characterized operation up to 125 °C - used in electronic ballasts for fluorescent lighting.

For engineers reviewing the BUL58D datasheet, BUL58D pinout, BUL58D application, or BUL58D equivalent, key selection criteria include V_CES = 800 V, t_f = 90 ns (T_j = 25 °C), R_thj-case = 1.47 °C/W, integrated diode V_f = 3 V @ 3 A, and rugged RBSOA for inductive switching in lighting SMPS.

Technical Context

The BUL58D employs Multi Epitaxial Planar technology to achieve high voltage capability while preserving wide Reverse Bias Safe Operating Area (RBSOA) and low dynamic parameter spread across lots. It supports reliable inductive load switching with t_s = 1 µs and t_f = 90 ns under specified test conditions (V_CL = 250 V, L = 200 µH).

Its integrated antiparallel diode enables self-commutated operation in half-bridge lighting topologies without external freewheeling diodes. Fully characterized at 125 °C, it delivers stable h_FE = 5–38 and V_CE(sat) ≤ 2 V at I_C = 5 A / I_B = 1 A, supporting low base-drive designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	800 V - supports primary-side switching in 230 VAC-fed SMPS with margin against line surges
I_C	8 A continuous - handles peak currents in 100–150 W electronic ballasts and halogen transformer drivers
t_f	90 ns - enables >100 kHz switching in resonant lamp igniters without excessive switching loss
R_thj-case	1.47 °C/W - allows 85 W dissipation with modest heatsinking in compact lighting enclosures
V_f (integrated diode)	3 V @ 3 A - reduces component count in self-oscillating half-bridge ballast circuits
h_FE	5–38 - supports direct TTL-compatible base drive with minimal external amplification
T_j(max)	150 °C - ensures operation in sealed lamp housings with ambient up to 85 °C

Pinout & Package

Package: TO-220 (3-pin, straight lead, insulated tab). Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab-connected). Mounting tab is electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Current return path for main conduction	Low-inductance emitter connection critical for minimizing switching oscillation in high-dI/dt ballast circuits
Pin 2 (Base)	Control input for bipolar conduction	Low base-drive requirement (I_B = 1 A for 5 A I_C) simplifies driver stage design
Pin 3 (Collector / Tab)	Main high-voltage current path and thermal interface	Collector-connected tab provides direct thermal path to heatsink; requires insulating washer when mounted to grounded chassis

Key Features

Feature	Design Value
High-voltage RBSOA	Enables robust 450 V sustained switching into inductive loads without secondary breakdown
Low lot-to-lot parameter spread	Ensures consistent t_s/t_f and V_CE(sat) across production batches for automated ballast manufacturing
Integrated antiparallel diode	Eliminates need for external flyback diode in self-oscillating half-bridge lamp drivers
Full 125 °C characterization	Guarantees h_FE ≥ 5 and V_CE(sat) ≤ 2 V at max operating temperature
Low base-drive requirement	Supports direct drive from small-signal transistors or logic gates without buffer stages

Applications

Electronic Ballasts

Halogen Lamp Transformers

Use Scenario: High-frequency (20–60 kHz) half-bridge resonant driver for T8/T5 fluorescent tubes.

IC Role / Device Role / Timing Role: Main switching transistor in self-oscillating topology; conducts during alternate half-cycles with integrated diode providing freewheeling path.

Use Value: Integrated diode and 90 ns t_f reduce component count and enable stable ignition without external snubbers.

Use Scenario: Compact 12 V AC output transformer replacement for 12 V/50 W halogen lamps.

IC Role / Device Role / Timing Role: Primary-side switch in push-pull or Royer oscillator configuration driving ferrite core.

Use Value: 800 V V_CES withstands reflected spikes from leakage inductance; ruggedness prevents failure during lamp short-circuit events.

SMPS for Lighting

Lamp Ignition Circuits

Use Scenario: Low-cost 60–100 W offline flyback or forward converter powering LED drivers or auxiliary supplies.

IC Role / Device Role / Timing Role: Primary switch handling 230 VAC rectified input; operates in discontinuous conduction mode.

Use Value: 85 W P_tot and 1.47 °C/W R_thj-case allow thermally constrained PCB-mount designs without forced air.

Use Scenario: High-voltage pulse generator for cold-cathode fluorescent lamp (CCFL) or neon tube ignition.

IC Role / Device Role / Timing Role: Fast turn-off switch discharging resonant capacitor into step-up transformer primary.

Use Value: 1 µs t_s and 90 ns t_f ensure precise timing control of ignition pulses with minimal energy loss.

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
STBUL74A	V_CES = 700 V, I_C = 10 A, t_f = 120 ns, no integrated diode	Higher current rating but lower voltage margin; requires external diode	Preferred where higher I_C and lower V_CE(sat) are prioritized over integrated diode and 800 V headroom
BUL49D	V_CES = 1000 V, I_C = 6 A, t_f = 150 ns, same integrated diode	Higher voltage rating trades off speed and current capability	Selected when surge immunity beyond 800 V is required, e.g., industrial outdoor lighting with lightning exposure

Compared with BUL58D, STBUL74A offers higher current but sacrifices voltage margin and integration; BUL49D extends voltage rating at the cost of slower switching and reduced current - choice depends on whether system priority is efficiency (BUL58D), current headroom (STBUL74A), or surge resilience (BUL49D).

Availability

BUL58D is available at Aetrix Electronics and suitable for electronic ballasts for fluorescent lighting, halogen lamp transformers, and switch-mode power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for BUL58D 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, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for automotive, industrial, and consumer markets.

The BUL series targets cost-sensitive, high-reliability lighting and SMPS applications - engineered for low dynamic parameter spread, rugged inductive switching, and simplified driver design in compact form factors.

FAQ

What is the maximum safe operating voltage for BUL58D in continuous DC blocking?

The absolute maximum V_CES is 800 V with base open, verified per STMicroelectronics datasheet Rev. 6 (2001). For reliable long-term operation in AC-line applications, derating to ≤600 V is recommended to accommodate transients and aging effects. The device is not rated for repetitive avalanche operation.

Does the integrated diode support reverse recovery in hard-switched topologies?

No - the integrated diode is a standard PN junction with no soft-recovery or ultrafast specification. Its V_f = 3 V @ 3 A and lack of specified t_rr indicate suitability only for low-frequency freewheeling (e.g., <50 kHz ballasts), not high-frequency synchronous rectification or ZVS transitions.

Can BUL58D be used in parallel configurations for higher current?

Parallel operation is not recommended due to positive thermal coefficient of V_CE(sat) and limited matching of h_FE and dynamic parameters across units. STMicroelectronics does not specify paralleling guidelines; thermal runaway risk increases without individual emitter resistors and matched layout.

Is the TO-220 package electrically insulated?

No - the metal tab is internally connected to the collector terminal. Electrical isolation from the heatsink requires a mica or ceramic insulator plus shoulder washer. STMicroelectronics specifies "insulated tab" only in mechanical drawings, meaning physical insulation from leads - not electrical isolation of the tab itself.

BUL58D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 450 V

Vce Saturation (Max) @ Ib, Ic:: 2V @ 1A, 5A

Current - Collector Cutoff (Max):: 200µA

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

Power - Max:: 85 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BUL58D FAQ

1.How can I place an order for BUL58D through Aetrix?

Please submit a Request for Quotation (RFQ) for BUL58D 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 BUL58D reliable?

The price and inventory of BUL58D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUL58D is usually 5 days.

3.What payment methods are accepted for BUL58D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUL58D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUL58D?

BUL58D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUL58D 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 BUL58D?

For technical support, including BUL58D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUL58D requirements.

6.How does Aetrix verify that BUL58D is sourced from the original manufacturer or authorized distributors?

All BUL58D 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 BUL58D meets industry standards.

7.What is the process for return or replacement of BUL58D?

All BUL58D units undergo pre-shipment inspection (PSI). If there is an issue with BUL58D, 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 BUL58D part is unused and in its original packaging.

Return procedure for BUL58D:

1.Submit a request within 90 days.

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

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