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

STMicroelectronics BUV98AV

Name: BUV98AV
Brand: STMicroelectronics
SKU: BUV98AV
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUV98AV

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: ISOTOP

Datasheet:: BUV98AV.pdf

Description:: TRANS NPN 450V 30A ISOTOP

Quantity:: RFQ Add To RFQ list

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Inventory:5,146

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Product details

Overview

BUV98AV from STMicroelectronics is a high-current NPN bipolar power transistor module in ISOTOP package, rated for 1000 V V_CEV, 30 A continuous collector current, and 150 W dissipation at T_c = 25 °C, with fully insulated U.L.-compliant construction for direct heatsink mounting in industrial motor control and welding equipment.

For engineers reviewing the BUV98AV datasheet, BUV98AV pinout, BUV98AV application, or BUV98AV equivalent, key selection criteria include its 0.83 °C/W junction-to-case thermal resistance, 450 V sustained collector-emitter voltage under inductive switching, 100 A/µs di_C/dt capability, and absence of internal base-emitter resistor - critical for gate drive compatibility in snubberless SMPS and UPS inverters.

Technical Context

The BUV98AV is a single-die NPN bipolar junction transistor optimized for hard-switching inductive loads without external snubbers, featuring low internal parasitic inductance and a reverse-biased safe operating area (SOA) validated up to 350 V at 30 A with 125 °C junction temperature.

Its electrical behavior is defined by pulsed h_FE ≥ 9 at I_C = 24 A, V_CE(sat) ≤ 1.5 V at I_C = 16 A / I_B = 3.2 A, and fast switching with t_s = 5 µs and t_f = 0.4 µs under specified inductive test conditions (L = 750 µH, V_BB = −5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEV	1000 V - Maximum non-repetitive collector-emitter voltage with V_BE = −5 V, enabling use in 600–800 V DC bus applications.
I_C	30 A - Continuous collector current rating at T_c = 25 °C, defining steady-state conduction capacity in motor drives.
R_thj-case	0.83 °C/W - Junction-to-case thermal resistance, directly determining heatsink sizing for thermal management.
di_C/dt	100 A/µs - Rate-of-rise capability under V_CC = 300 V, supporting fast turn-on in high-frequency inverter stages.
V_CE(sat)	1.5 V @ I_C = 16 A / I_B = 3.2 A - Low saturation voltage reduces conduction loss and heat generation during on-state.
V_isol	2500 V RMS - Insulation withstand voltage between all four terminals and heatsink, enabling safe chassis-mounting without isolation hardware.

Pinout & Package

The BUV98AV uses the ISOTOP (Insulated Standard Outline Transistor Package), a 4-terminal, fully insulated metal package with baseplate isolation compliant to UL 1557. Pin 4 is not connected.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Main emitter terminal	Low-inductance connection point for emitter return path; electrically isolated from heatsink.
2 (Collector)	Main collector terminal	High-current output node rated for 1000 V transient; mounted on insulated baseplate.
3 (Base)	Control input	Direct base drive interface requiring external current source; no integrated resistor.
4	Not connected	No internal connection; must remain unconnected in PCB layout and mechanical mounting.

Key Features

Feature	Design Value
U.L.-compliant full insulation	Enables direct bolt-down mounting to grounded heatsinks without additional insulating hardware or thermal pads.
Snubberless inductive switching	Validated 350 V off-state voltage at 30 A with 750 µH load, eliminating external RC snubbers in UPS and welding inverters.
Low R_thj-case	0.83 °C/W allows compact thermal design - e.g., 1.25 °C/W total system R_th supports 100 W dissipation at ΔT = 125 °C.
High di_C/dt immunity	100 A/µs rating ensures robust turn-on against stray inductance in high-power PCB layouts and busbar connections.

Applications

Motor Control Inverters

Industrial UPS Systems

Use Scenario: Three-phase IGBT driver stage in 15–30 kW servo drives, switching at 4–8 kHz with 600 V DC bus.

IC Role / Device Role / Timing Role: High-current NPN switch controlling gate drive transformer primary to deliver peak base current >6 A during IGBT turn-on.

Use Value: Low V_CE(sat) (1.5 V) and fast storage time (5 µs) minimize driver losses and enable precise timing control of IGBT switching edges.

Use Scenario: DC-link chopper in 20 kVA online double-conversion UPS, handling 40 A peak load transients.

IC Role / Device Role / Timing Role: Main power switch in boost/buck converter stage, operating in hard-switched mode without snubber network.

Use Value: Reverse-biased SOA and 350 V V_CEW rating allow reliable operation under line surges and battery-backup transitions without derating.

Resistance Welding Controls

SMPS Primary Switches

Use Scenario: Secondary-side current switch in capacitor-discharge weld controllers delivering 5–10 kA pulses over 10–100 ms.

IC Role / Device Role / Timing Role: High-pulse-current switch conducting 60 A peak (I_CM) with minimal voltage overshoot during turn-off.

Use Value: 0.05 °C/W case-to-heatsink thermal resistance (with grease) sustains repetitive pulse duty cycles without thermal runaway.

Use Scenario: Primary-side switch in 3–5 kW telecom rectifier, operating at 100 kHz with 400 V DC input.

IC Role / Device Role / Timing Role: Hard-switched bipolar transistor replacing MOSFETs where cost and ruggedness outweigh switching speed requirements.

Use Value: 100 A/µs di_C/dt and low internal parasitic inductance reduce voltage spikes and EMI in high-di/dt primary circuits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BUV98AX	Same die, but non-insulated package (no U.L. isolation); R_thj-case = 0.75 °C/W	Requires external insulator and thermal pad; unsuitable for direct-chassis mounting	Select only when isolation is handled externally and lower thermal resistance is prioritized.
STGD10NB60KD	600 V, 10 A N-channel MOSFET in TO-247; logic-level gate, no base drive needed	Lower peak current (10 A), higher R_DS(on); suited for <5 kW, higher-frequency SMPS	Prefer for designs needing simplified gate drive and <100 kHz operation, but not for 30 A+ or snubberless inductive loads.

Compared with BUV98AX, the BUV98AV trades 0.08 °C/W higher thermal resistance for full U.L.-rated insulation - essential for safety-critical industrial mounting. Versus STGD10NB60KD, it delivers triple the current and superior ruggedness in snubberless inductive switching, albeit with more complex base drive requirements.

Availability

BUV98AV is available at Aetrix Electronics and suitable for motor control inverters, industrial UPS systems, resistance welding equipment, and high-power SMPS requiring stable component supply and long-lifecycle support.

Supply support for BUV98AV 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The BUV98AV belongs to ST's high-voltage bipolar power transistor family, engineered specifically for rugged, high-current industrial switching where reliability under accidental overload and thermal stress is paramount.

FAQ

Is the BUV98AV still in active production?

No - the BUV98AV is marked "Obsolete Product(s)" in its official STMicroelectronics datasheet (March 2003). However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for redesign evaluation and drop-in alternatives where applicable.

Can Pin 4 be used as a heatsink connection or ground reference?

No - Pin 4 is explicitly designated "not connected" in the internal schematic and mechanical drawings. It has no internal bond wire or die connection. Using it as a heatsink contact or signal reference violates the ISOTOP insulation integrity and may cause short circuits or safety hazards.

What base drive current is required for full saturation at 30 A collector current?

Per datasheet electrical characteristics, h_FE ≥ 9 at I_C = 24 A, so minimum base current is ~2.67 A. For reliable saturation across temperature and process variation, ST recommends I_B = 5 A at I_C = 24 A - implying ~6.25 A for 30 A, consistent with the 8 A I_B absolute maximum rating.

Does the 2500 V isolation rating apply to DC or AC stress?

The 2500 V rating is specified as RMS AC withstand voltage per UL 1557, verified at 50/60 Hz. It corresponds to ~3535 V peak sinusoidal stress. For DC applications, ST does not publish a separate DC isolation rating; design margin should be applied based on creepage/clearance distances shown in the ISOTOP mechanical drawing (P093A).

BUV98AV Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: ISOTOP

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 30 A

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

Vce Saturation (Max) @ Ib, Ic:: 5V @ 5A, 24A

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 9 @ 24A, 5V

Power - Max:: 150 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: ISOTOP

BUV98AV FAQ

1.How can I place an order for BUV98AV through Aetrix?

Please submit a Request for Quotation (RFQ) for BUV98AV 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 BUV98AV reliable?

The price and inventory of BUV98AV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUV98AV is usually 5 days.

3.What payment methods are accepted for BUV98AV?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUV98AV transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUV98AV?

BUV98AV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUV98AV 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 BUV98AV?

For technical support, including BUV98AV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUV98AV requirements.

6.How does Aetrix verify that BUV98AV is sourced from the original manufacturer or authorized distributors?

All BUV98AV 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 BUV98AV meets industry standards.

7.What is the process for return or replacement of BUV98AV?

All BUV98AV units undergo pre-shipment inspection (PSI). If there is an issue with BUV98AV, 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 BUV98AV part is unused and in its original packaging.

Return procedure for BUV98AV:

1.Submit a request within 90 days.

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

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