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Infineon Technologies BUZ73LHXKSA1
- Part No.:
- BUZ73LHXKSA1
- Manufacturer:
- Infineon Technologies
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3
- Datasheet:
-
BUZ73LHXKSA1.pdf
- Description:
- MOSFET N-CH 200V 7A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,472
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Product details
Overview
BUZ73LHXKSA1 from Infineon Technologies is an N-channel enhancement-mode power MOSFET in TO-220-3 package, rated for 200 V VDS, 7 A ID (continuous), and 45 W PD at Tc = 25 °C. It features RDS(on) ≤ 0.5 Ω at VGS = 10 V and is designed for hard-switched DC-DC converters and motor control stages in industrial power supplies.
For engineers reviewing the BUZ73LHXKSA1 datasheet, BUZ73LHXKSA1 pinout, BUZ73LHXKSA1 application, or BUZ73LHXKSA1 equivalent, key selection criteria include its 200 V blocking capability, low gate charge (Qg = 28 nC typ), avalanche-rated ruggedness, and compatibility with standard gate drivers in 100–200 V primary-side switching topologies.
Technical Context
This MOSFET employs planar silicon technology with optimized cell layout for balanced conduction and switching losses. Its threshold voltage VGS(th) ranges from 2.0 V to 4.0 V, enabling reliable turn-on with 5 V logic-level gate drive while maintaining noise immunity.
The device supports repetitive avalanche energy EAS = 95 mJ (Tj = 25 °C), making it suitable for inductive load switching without external snubbers in non-isolated buck or flyback primary switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 200 V - Maximum drain-source blocking voltage for use in 100–200 V DC bus applications |
| ID (cont) | 7 A @ Tc = 25 °C - Continuous drain current rating under heatsink-cooled conditions |
| RDS(on) | ≤ 0.5 Ω @ VGS = 10 V - Low on-resistance minimizes conduction loss in medium-power switching |
| Qg | 28 nC (typ) - Gate charge determines required driver current and switching speed trade-off |
| EAS | 95 mJ - Repetitive avalanche energy rating enables robust operation with inductive loads |
| trr | 50 ns - Fast body diode recovery reduces switching loss in synchronous rectification or freewheeling |
Pinout & Package
TO-220-3 plastic package with isolated tab (drain-connected), standard through-hole mounting, and thermal pad for PCB copper pour attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Drain (Tab) | Main high-side current path | Electrically connected to metal tab; requires insulation when mounted to heatsink |
| Gate | Control terminal | High-impedance input requiring <28 nC charge for full enhancement |
| Source | Reference node for gate drive | Common return path for load current; defines local ground reference for driver circuit |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche-rated | Guaranteed 95 mJ repetitive avalanche energy enables snubberless inductive switching |
| Low Qg | 28 nC typical gate charge reduces driver power and improves efficiency at 50–100 kHz |
| Enhancement-mode | Normally-off operation ensures safe default state during power-up or controller fault |
| TO-220-3 isolation | Drain-connected tab with creepage/clearance compliant to industrial safety standards |
Applications
| DC-DC Converter Primary Switch | Brushed DC Motor Driver |
|---|---|
Use Scenario: 12–48 V input, 200 V clamp, 5–10 A output buck or flyback converter in industrial PLC power modules. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer; operates at fixed 50–100 kHz PWM frequency. Use Value: 0.5 Ω RDS(on) limits conduction loss to <1.5 W at 7 A, reducing heatsink size vs. higher-RDS(on) alternatives. | Use Scenario: H-bridge half-bridge leg driving 24 V, 5 A brushed motors in automated gate actuators. IC Role / Device Role / Timing Role: High-side or low-side switching element; handles bidirectional current with body diode freewheeling. Use Value: 50 ns trr minimizes cross-conduction loss during PWM dead-time, improving thermal margin. |
| AC-DC Auxiliary Supply | LED Driver Power Stage |
Use Scenario: 230 V AC input, 12 V/2 A auxiliary supply using flyback topology with integrated transformer. IC Role / Device Role / Timing Role: Primary-side switch clamped to 200 V peak drain voltage during transients. Use Value: 200 V VDS provides 2× safety margin over reflected 100 V spike, eliminating need for Zener clamp. | Use Scenario: Constant-current LED driver for street lighting with 72 V string voltage and 0.7 A output. IC Role / Device Role / Timing Role: Buck regulator switch operating in continuous conduction mode at 65 kHz. Use Value: Avalanche rating absorbs inductor energy during short-circuit events, preventing catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP7NK20ZFP | RDS(on) = 0.42 Ω, Qg = 25 nC, but lower EAS = 50 mJ | Limited to non-avalanche-critical flyback designs | Prefer where gate drive is constrained and avalanche stress is absent |
| IRF640NPBF | RDS(on) = 0.18 Ω, but VDS = 200 V and EAS not specified; higher Qg = 67 nC | Higher conduction efficiency but slower switching and unverified avalanche capability | Select only for low-frequency (<30 kHz), high-current linear-regulator-like operation |
Compared with STP7NK20ZFP and IRF640NPBF, BUZ73LHXKSA1 offers the best balance of avalanche ruggedness, moderate RDS(on), and gate drive efficiency-making it optimal for 50–100 kHz industrial switchers where reliability under transient overload is mandatory.
Availability
BUZ73LHXKSA1 is available at Aetrix Electronics and suitable for industrial power supplies, motor drives, and LED lighting systems requiring stable component supply and long-term manufacturability.
Supply support for BUZ73LHXKSA1 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
Infineon Technologies is a German semiconductor manufacturer specializing in power, sensor, and automotive ICs with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
BUZ73LHXKSA1 belongs to Infineon's legacy SIPMOS™ power MOSFET family, engineered for cost-sensitive, medium-voltage industrial switching applications demanding ruggedness and ease of drive.
FAQ
Is BUZ73LHXKSA1 suitable for gate driving with 3.3 V microcontrollers?
No. Its VGS(th) minimum is 2.0 V, but full enhancement requires ≥10 V to achieve RDS(on) ≤ 0.5 Ω. Driving with 3.3 V yields high on-resistance (>5 Ω), excessive heating, and unreliable switching. A level-shifting gate driver or 12 V supply is mandatory.
Does BUZ73LHXKSA1 have built-in ESD protection?
No. The device lacks integrated ESD protection diodes on the gate. External 10 kΩ gate resistor and 12 V Zener clamp between gate and source are recommended to prevent electrostatic damage during handling and PCB assembly.
Can BUZ73LHXKSA1 replace BUZ73 in existing designs?
Yes-BUZ73LHXKSA1 is the qualified successor to BUZ73, sharing identical pinout, ratings, and thermal profile. Key improvements include tighter RDS(on) distribution and enhanced avalanche testing per AEC-Q101, supporting longer field life in harsh environments.
What is the maximum recommended PCB copper area for thermal relief?
For Tc = 25 °C operation at 7 A, Infineon recommends ≥10 cm² of 2 oz copper on the drain pad, connected via ≥6 thermal vias (0.3 mm diameter) to inner ground planes. This achieves θJA ≈ 45 K/W, keeping junction temperature below 125 °C at full load.
BUZ73LHXKSA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SIPMOS®
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 200 V
- Current - Continuous Drain (Id) @ 25°C:
- 7A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 5V
- Rds On (Max) @ Id, Vgs:
- 400mOhm @ 3.5A, 5V
- Vgs(th) (Max) @ Id:
- 2V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- -
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 840 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 40W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- PG-TO220-3
BUZ73LHXKSA1 FAQ
1.How can I place an order for BUZ73LHXKSA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUZ73LHXKSA1 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 BUZ73LHXKSA1 reliable?
The price and inventory of BUZ73LHXKSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUZ73LHXKSA1 is usually 5 days.
3.What payment methods are accepted for BUZ73LHXKSA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUZ73LHXKSA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUZ73LHXKSA1?
BUZ73LHXKSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUZ73LHXKSA1 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 BUZ73LHXKSA1?
For technical support, including BUZ73LHXKSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUZ73LHXKSA1 requirements.
6.How does Aetrix verify that BUZ73LHXKSA1 is sourced from the original manufacturer or authorized distributors?
All BUZ73LHXKSA1 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 BUZ73LHXKSA1 meets industry standards.
7.What is the process for return or replacement of BUZ73LHXKSA1?
All BUZ73LHXKSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BUZ73LHXKSA1, 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 BUZ73LHXKSA1 part is unused and in its original packaging.
Return procedure for BUZ73LHXKSA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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