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

STMicroelectronics BUL416

Name: BUL416
Brand: STMicroelectronics
SKU: BUL416
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUL416

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BUL416.pdf

Description:: TRANS NPN 800V 6A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:8,951

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Product details

Overview

BUL416 from STMicroelectronics is a high-voltage, fast-switching NPN power transistor in TO-220 package, rated for 800 V V_CEO, 6 A I_C, and 110 W P_tot at T_C = 25 °C. It features hollow emitter structure for enhanced switching speed, full characterization at 125 °C, and low dynamic parameter spread-optimized for electronic ballasts and low-cost SMPS.

For engineers reviewing the BUL416 datasheet, BUL416 pinout, BUL416 application, or BUL416 equivalent, key selection criteria include V_CEO = 800 V, t_s = 2.3 µs (T_j = 25 °C), R_thj-case = 1.14 °C/W, h_FE Group A/B (10–40), and TO-220 mechanical compatibility with heatsink mounting.

Technical Context

This device employs Multi-Epitaxial Mesa process and hollow emitter geometry to reduce minority carrier storage time and improve turn-off performance under inductive loads. Its SOA is defined up to 150 °C junction temperature with derating beyond 25 °C case temperature.

Designed for hard-switched topologies, it supports sustained V_CE = 800 V at I_C = 100 mA (V_CEO(sus)) and delivers V_CE(sat) = 1.5 V at I_C = 2 A / I_B = 0.4 A, enabling efficient operation in resonant and quasi-resonant lighting drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	800 V - Sustains 800 V collector-emitter voltage with base open, critical for flyback and half-bridge snubberless operation
I_C	6 A continuous - Supports 6 A DC collector current at T_C = 25 °C, suitable for 60–100 W ballast designs
t_s	2.3 µs - Storage time measured under inductive load (L = 200 µH), directly impacts minimum off-time in high-frequency SMPS
R_thj-case	1.14 °C/W - Enables thermal design with standard TO-220 heatsinks for <100 W conduction-limited applications
h_FE (Group A)	10–25 - Pre-selected DC current gain range ensures consistent base drive sizing across production lots
V_CE(sat)	1.5 V @ I_C = 2 A / I_B = 0.4 A - Low saturation voltage reduces conduction loss in linear and switching regions

Pinout & Package

TO-220 package with isolated tab (collector-connected), standard 3-lead through-hole mounting. Tab is electrically connected to collector; mounting screw must be insulated unless collector is at system ground potential.

Pin/Terminal	Circuit Role	Design Meaning
Collector (Tab)	Main power output terminal	Electrically tied to metal tab; requires insulating washer if not referenced to heatsink ground
Base	Control input	Receives forward bias current to saturate transistor; designed for 0.4–1.33 A drive per spec
Emitter	Power return path	Serves as common reference for base drive and load return; low-inductance layout essential for fast switching

Key Features

Feature	Design Value
Hollow emitter structure	Reduces minority carrier storage, enabling t_s = 2.3 µs and t_f = 650 ns under standardized inductive test conditions
Full 125 °C characterization	Guarantees ICEO ≤ 500 µA and h_FE stability at elevated junction temperature for lighting ambient reliability
Low dynamic parameter spread	Narrow distribution of t_s, t_f, and h_FE improves batch-to-batch consistency in mass-produced ballasts
Multi-Epitaxial Mesa process	Enables high breakdown voltage (V_CES = 1600 V) while maintaining competitive on-state performance

Applications

Electronic Ballast

SMPS Primary Switch

Use Scenario: High-frequency (20–60 kHz) resonant driver for T5/T8 fluorescent lamps with integrated igniter function.

IC Role / Device Role / Timing Role: Main switching element in half-bridge topology, handling peak currents up to 9 A during lamp strike.

Use Value: Hollow emitter and low t_s enable reliable zero-voltage switching transitions without external snubbers.

Use Scenario: Primary-side switch in 30–75 W offline flyback converters for LED drivers and auxiliary supplies.

IC Role / Device Role / Timing Role: Hard-switched power transistor operating at 40–100 kHz with duty cycle modulation.

Use Value: V_CEO = 800 V withstands reflected transients in universal-input designs without clamping circuitry.

Inductive Heater Driver

DC Motor Commutation

Use Scenario: Medium-power (40–80 W) induction heating module for small appliances using series-resonant tank.

IC Role / Device Role / Timing Role: High-dV/dt switch controlling resonant current flow into ferrite-loaded coil.

Use Value: R_thj-case = 1.14 °C/W allows direct heatsink mounting for stable 100 °C junction operation under burst-mode control.

Use Scenario: Brushed DC motor H-bridge upper-leg switch in industrial actuators and HVAC dampers.

IC Role / Device Role / Timing Role: Unidirectional high-side switch handling 6 A stall current with PWM-controlled torque.

Use Value: V_CE(sat) = 1.5 V minimizes I²R loss during extended conduction periods in low-speed operation.

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
STBUL7416	Same die, TO-220FP (full-pack) variant with shorter leads and lower R_thj-amb (50 °C/W vs. 62.5 °C/W)	Better suited for compact PCB layouts where lead bending is restricted	Select when board space is constrained and forced-air cooling is available
BU508A	Lower V_CEO = 1500 V but higher V_CE(sat) = 2.0 V @ I_C = 2 A; no 125 °C characterization	Used in legacy CRT flyback designs requiring higher breakdown than BUL416	Choose only if >1500 V blocking is mandatory and thermal margin permits higher saturation loss

Compared with STBUL7416 and BU508A, the BUL416 offers superior thermal resistance to case (1.14 °C/W), guaranteed 125 °C parametric performance, and tighter dynamic parameter spread-making it optimal for cost-sensitive, thermally demanding lighting and SMPS applications where consistency matters.

Availability

BUL416 is available at Aetrix Electronics and suitable for electronic ballasts, switch-mode power supplies, and inductive heater drivers requiring stable component supply and long-term manufacturability support.

Supply support for BUL416 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, and analog ICs for industrial, automotive, and consumer markets.

The BUL series belongs to ST's high-voltage power transistor product line, engineered specifically for cost-effective, thermally robust switching in lighting and low-to-mid power SMPS applications.

FAQ

Is BUL416 still in active production?

No-BUL416 is marked "Obsolete Product(s)" in the official STMicroelectronics datasheet (Rev. 3, Jan 2005). While legacy stock remains available through authorized distributors and Aetrix Electronics, ST no longer manufactures this part. Customers should evaluate STBUL7416 or newer alternatives like STGP10NC60KD for new designs.

Can BUL416 be used in avalanche mode?

No-BUL416 is not rated for repetitive avalanche operation. Its safe operating area (SOA) curves assume non-avalanche switching with external clamping or snubbing. The V_CEO(sus) = 800 V rating applies only under specified inductive test conditions (L = 25 mH, I_C = 100 mA), not unclamped inductive turn-off.

What is the meaning of Group A and Group B in h_FE specification?

Group A specifies h_FE = 10–25, Group B = 12–27 at I_C = 0.7 A, V_CE = 5 V. ST pre-sorts devices into these groups to tighten DC gain distribution. Either group may ship depending on production availability; design must accommodate the full combined range (10–27) for robust base drive sizing.

Does the TO-220 tab require electrical isolation?

Yes-the metal tab is internally connected to the collector. If the heatsink is grounded or at a different potential than the collector node, an insulating washer (e.g., mica or silicone pad) and shoulder washer must be used to prevent short circuits. Thermal interface material must maintain dielectric integrity above 1600 V isolation rating.

BUL416 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 6 A

Voltage - Collector Emitter Breakdown (Max):: 800 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 1.33A, 4A

Current - Collector Cutoff (Max):: 250µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 12 @ 700mA, 5V

Power - Max:: 110 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BUL416 FAQ

1.How can I place an order for BUL416 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUL416 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 BUL416 reliable?

The price and inventory of BUL416 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUL416 is usually 5 days.

3.What payment methods are accepted for BUL416?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUL416 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUL416?

BUL416 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUL416 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 BUL416?

For technical support, including BUL416 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUL416 requirements.

6.How does Aetrix verify that BUL416 is sourced from the original manufacturer or authorized distributors?

All BUL416 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 BUL416 meets industry standards.

7.What is the process for return or replacement of BUL416?

All BUL416 units undergo pre-shipment inspection (PSI). If there is an issue with BUL416, 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 BUL416 part is unused and in its original packaging.

Return procedure for BUL416:

1.Submit a request within 90 days.

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

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