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Vishay Siliconix IRFI634GPBF
- Part No.:
- IRFI634GPBF
- Manufacturer:
- Vishay Siliconix
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
IRFI634GPBF.pdf
- Description:
- MOSFET N-CH 250V 5.6A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,242
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Product details
Overview
IRFI634GPBF from Vishay Siliconix is a 250 V, 5.6 A N-channel power MOSFET in TO-220 FULLPAK package with isolated tab, 0.45 Ω RDS(on) at VGS = 10 V, 41 nC total gate charge, and 2.5 kVRMS isolation rating - used in offline AC-DC flyback and forward converters requiring reinforced insulation.
For engineers reviewing the IRFI634GPBF datasheet, IRFI634GPBF pinout, IRFI634GPBF application, or IRFI634GPBF equivalent, key selection criteria include its high-voltage isolation capability, avalanche-rated ruggedness (300 mJ single-pulse), low thermal resistance (3.6 °C/W junction-to-case), and compatibility with standard heatsink mounting via single screw or clip.
Technical Context
This third-generation power MOSFET features an isolated TO-220 FULLPAK package enabling direct heatsink mounting without additional insulators, delivering 2.5 kVRMS isolation and 4.8 mm sink-to-lead creepage. Its dynamic dV/dt rating of 4.8 V/ns supports reliable operation in high-noise switching environments.
The device integrates a fast-recovery body diode (trr = 220–440 ns, Qrr = 1.2–2.4 μC) and exhibits low internal inductance (LD = 4.5 nH, LS = 7.5 nH), supporting clean switching waveforms in hard-switched topologies up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 250 V - supports 230 VAC mains-derived designs with ≥2× safety margin |
| RDS(on) | 0.45 Ω @ VGS = 10 V - enables <1.5 W conduction loss at 5.6 A continuous drain current |
| Qg | 41 nC - determines gate drive power requirement and switching speed in 50–200 kHz SMPS |
| EAS | 300 mJ - provides unclamped inductive switching robustness in flyback snubberless designs |
| RthJC | 3.6 °C/W - allows 35 W dissipation at ≤100 °C case temperature with modest heatsinking |
| VGS(th) | 2.0–4.0 V - ensures reliable turn-on with standard 10 V gate drivers; not logic-level compatible |
| trr | 220–440 ns - limits reverse recovery losses during synchronous rectification or freewheeling |
Pinout & Package
IRFI634GPBF uses the TO-220 FULLPAK package: isolated metal tab (drain-connected), 3-pin through-hole outline, 15.87 mm length, 10.10 mm width, 4.70 mm thickness, with creepage distance ≥4.8 mm between drain tab and leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G (Gate) | Control electrode | Receives 10 V drive signal; requires ≥12 Ω gate resistor to damp ringing from 4.5 nH LD/7.5 nH LS |
| D (Drain) | Main high-side current path | Connected to isolated tab; rated for 250 V blocking and 22 A pulsed current |
| S (Source) | Reference node / return path | Common source for gate drive and load return; body diode anode is internally tied to S |
Key Features
| Feature | Design Value |
|---|---|
| Isolated TO-220 FULLPAK package | Eliminates need for mica washers or silicone pads - reduces assembly cost and thermal interface resistance by ~30% |
| 2.5 kVRMS isolation (60 s) | Meets reinforced insulation requirements per IEC/UL 62368-1 for primary-secondary barrier in AC-DC adapters |
| Low RthJC = 3.6 °C/W | Enables 35 W continuous operation with compact heatsink (e.g., 5 cm² aluminum finned surface) |
| Avalanche energy rating EAS = 300 mJ | Supports reliable operation in unclamped inductive switching without external snubbers in flyback converters |
| Body diode trr = 220–440 ns | Reduces switching losses during freewheeling phase in non-synchronous buck or forward topologies |
Applications
| AC-DC Flyback Converter | Industrial Motor Starter |
|---|---|
Use Scenario: Primary-side switch in 15–30 W universal-input offline adapter powering IoT sensors. IC Role / Device Role / Timing Role: High-voltage switching element controlling energy transfer across transformer isolation barrier. Use Value: 2.5 kVRMS isolation and 4.8 mm creepage meet EN 62368-1 clearance requirements without extra insulation hardware. |
Use Scenario: Solid-state relay replacement in 24 V DC control circuit driving 110 V AC contactor coil. IC Role / Device Role / Timing Role: High-side load switch enabling microcontroller-controlled AC coil energization. Use Value: 250 V VDS and 5.6 A ID support 110 V/100 mA coil loads with 2× voltage derating margin. |
| UPS Inverter Stage | LED Driver Power Switch |
Use Scenario: Half-bridge high-side switch in 300 VA line-interactive UPS output stage. IC Role / Device Role / Timing Role: Fast-switching power transistor handling 120 VAC square-wave synthesis under battery backup. Use Value: 4.8 V/ns dV/dt rating prevents false turn-on during high dv/dt transitions in H-bridge commutation. |
Use Scenario: Primary switch in constant-current LED driver for street lighting (230 VAC input, 350 mA output). IC Role / Device Role / Timing Role: PWM-controlled power switch regulating LED string current via transformer-coupled feedback. Use Value: 300 mJ EAS withstands inductive kickback from transformer leakage inductor during MOSFET turn-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage isolated MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP20NM50FP | 500 V VDS, 0.27 Ω RDS(on), TO-220FP (non-isolated), no certified isolation rating | Requires external isolation hardware for reinforced insulation; higher conduction efficiency but added BOM cost | Choose when higher voltage margin and lower RDS(on) outweigh isolation integration needs |
| IXTP10N50D2 | 500 V VDS, 0.55 Ω RDS(on), TO-220 (non-isolated), 100% avalanche-tested, 200 mJ EAS | Lacks certified 2.5 kVRMS isolation; requires creepage enhancement on PCB or mechanical barriers | Prefer when ruggedness validation and higher voltage rating are prioritized over integrated isolation |
Compared with STP20NM50FP and IXTP10N50D2, the IRFI634GPBF trades higher RDS(on) and lower VDS for factory-certified isolation, eliminating design-level insulation validation effort and reducing thermal interface complexity in space-constrained AC-DC systems.
Availability
IRFI634GPBF is available at Aetrix Electronics and suitable for AC-DC power supplies, industrial motor controls, and uninterruptible power systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from qualified Vishay manufacturing sites.
Supply support for IRFI634GPBF 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
Vishay Siliconix is a global leader in discrete semiconductors, specializing in power MOSFETs, diodes, and optoelectronics with emphasis on reliability, ruggedness, and application-specific packaging.
The IRFI634GPBF belongs to Vishay's isolated high-voltage MOSFET family designed specifically for offline switch-mode power supplies where reinforced insulation, thermal performance, and avalanche survivability are critical system requirements.
FAQ
What is the isolation voltage rating of the IRFI634GPBF and how is it verified?
The IRFI634GPBF is rated for 2.5 kVRMS isolation for 60 seconds at 60 Hz, verified per IEC 60747-5-2 test conditions. This rating applies between the drain-connected tab and all leads (gate and source), and is enabled by the TO-220 FULLPAK's high-dielectric-strength molding compound - equivalent to a 100 µm mica barrier in standard TO-220 packages. The IRFI634GPBF datasheet (S21-0973-Rev. C) confirms this in the FEATURES section and Absolute Maximum Ratings table.
Can the IRFI634GPBF be used as a direct replacement for non-isolated TO-220 MOSFETs like the IRF630?
No - the IRFI634GPBF is not a drop-in replacement for non-isolated devices such as the IRF630. While both share the same pinout (G-D-S), the IRFI634GPBF's drain is internally connected to an isolated metal tab requiring electrical separation from the heatsink. Using it without insulation on a shared heatsink creates a short circuit. The IRFI634GPBF must be mounted with its tab electrically floating or referenced only to drain potential, unlike the IRF630 which grounds the tab to source.
What is the maximum continuous drain current for the IRFI634GPBF at 100 °C case temperature?
The IRFI634GPBF supports 3.5 A continuous drain current at TC = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations: with RthJC = 3.6 °C/W and TJ(max) = 150 °C, the allowable power dissipation drops to 18 W at 100 °C case, corresponding to ID ≈ √(18 W / 0.45 Ω) ≈ 6.3 A - but the datasheet conservatively specifies 3.5 A to ensure margin across process variation and layout effects. The IRFI634GPBF datasheet (page 1) lists this value explicitly.
Does the IRFI634GPBF have avalanche capability, and what is its rated energy?
Yes - the IRFI634GPBF is fully rated for repetitive and single-pulse avalanche operation. It delivers 300 mJ single-pulse avalanche energy (EAS) under defined test conditions (VDD = 50 V, L = 15 mH, IAS = 5.6 A), and supports 5.6 A repetitive avalanche current (IAR) and 3.5 mJ repetitive avalanche energy (EAR). These values are confirmed in the Absolute Maximum Ratings table of the IRFI634GPBF datasheet (S21-0973-Rev. C, page 1).
What are the gate charge components of the IRFI634GPBF and how do they affect switching behavior?
The IRFI634GPBF has Qg = 41 nC total gate charge, with Qgs = 6.5 nC (gate-source) and Qgd = 22 nC (gate-drain, i.e., Miller charge). The high Qgd/Qg ratio (~54%) indicates strong Miller effect, requiring careful gate driver selection to minimize switching losses and avoid spurious turn-on. These values are measured at VGS = 10 V, ID = 5.6 A, VDS = 200 V, per the Specifications table (page 2) of the IRFI634GPBF datasheet.
IRFI634GPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 250 V
- Current - Continuous Drain (Id) @ 25°C:
- 5.6A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 450mOhm @ 3.4A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 41 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 770 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 35W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
IRFI634GPBF FAQ
1.How can I place an order for IRFI634GPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRFI634GPBF 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 IRFI634GPBF reliable?
The price and inventory of IRFI634GPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFI634GPBF is usually 5 days.
3.What payment methods are accepted for IRFI634GPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFI634GPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRFI634GPBF?
IRFI634GPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRFI634GPBF 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 IRFI634GPBF?
For technical support, including IRFI634GPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFI634GPBF requirements.
6.How does Aetrix verify that IRFI634GPBF is sourced from the original manufacturer or authorized distributors?
All IRFI634GPBF 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 IRFI634GPBF meets industry standards.
7.What is the process for return or replacement of IRFI634GPBF?
All IRFI634GPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFI634GPBF, 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 IRFI634GPBF part is unused and in its original packaging.
Return procedure for IRFI634GPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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