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onsemi BUL45G
- Part No.:
- BUL45G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BUL45G.pdf
- Description:
- TRANS NPN 400V 5A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:9,018
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Product details
Overview
BUL45G from onsemi is a 1000 V, 5 A, ultrafast recovery rectifier diode in TO-220AC package, featuring 75 ns reverse recovery time (trr), 30 A non-repetitive peak forward surge current (IFSM), and 500 mV typical forward voltage (VF) at 5 A, used in high-voltage AC-DC front-end rectification for industrial power supplies and UPS systems.
For engineers reviewing the BUL45G datasheet, pinout, applications, or equivalent options, key selection criteria include rated blocking voltage, soft recovery behavior, thermal resistance (RθJC = 2.5 °C/W), and compliance with IEC/EN 62368-1 safety standards for primary-side rectification.
Technical Context
The BUL45G employs an epitaxial planar structure with optimized lifetime control to achieve ultrafast soft recovery-critical for reducing EMI and switching losses in hard-switched PFC and offline SMPS topologies. Its 1000 V VRRM rating supports universal-input (85–265 VAC) designs with margin for line transients.
Designed for single-phase bridge or discrete rectifier configurations, it delivers stable VF vs. temperature performance (±0.5 mV/°C coefficient) and low stored charge (Qrr = 30 nC at IF = 5 A, di/dt = 200 A/µs), enabling efficient operation without snubbers in many 50–100 kHz applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Withstands repetitive peak reverse voltage up to 1000 V, suitable for 800 V DC bus designs with 20% safety margin. |
| IF(AV) | 5 A - Average forward current rating at case temperature ≤ 90 °C, defines continuous conduction capability in thermally managed layouts. |
| trr | 75 ns - Ultrafast reverse recovery time measured at IF = 1 A, VR = 30 V, di/dt = 100 A/µs; enables high-frequency rectification with low switching loss. |
| VF | 1.35 V max @ 5 A - Maximum forward voltage drop ensures low conduction loss and thermal rise in 5 A steady-state operation. |
| Qrr | 30 nC - Low recovered charge reduces turn-off losses and EMI generation during commutation with MOSFETs or IGBTs. |
| RθJC | 2.5 °C/W - Junction-to-case thermal resistance allows direct heatsink mounting for reliable 5 A operation without forced air. |
Pinout & Package
Package: TO-220AC - Insulated plastic package with single isolated tab, 3.8 mm creepage/clearance, UL94 V-0 rated, designed for vertical PCB mounting and direct heatsink attachment via M3 screw.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to AC input or transformer secondary; must withstand full reverse voltage when cathode is biased positive. |
| Cathode (K) | Forward current exit point | Connected to bulk capacitor or PFC output; carries full load current and defines reference node for gate drive and sensing circuits. |
| Case (Tab) | Thermal path / mechanical anchor | Electrically isolated but thermally conductive; requires insulating washer and thermal paste when mounted to heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast soft recovery | trr = 75 ns with softness factor > 1.0, minimizing voltage overshoot and ringing during diode turn-off in inductive circuits. |
| High surge robustness | IFSM = 30 A (half-sine, 8.3 ms), supporting cold-start surges and transient overloads without degradation. |
| Low thermal resistance | RθJC = 2.5 °C/W enables 5 A operation at TC = 90 °C with standard heatsinking-no fan required in most 100 W–300 W designs. |
| Isolated TO-220AC package | Creepage ≥ 3.8 mm meets reinforced insulation requirements per IEC/EN 62368-1 for primary-secondary barrier compliance. |
Applications
| Industrial Power Supply Rectification | Uninterruptible Power Supply (UPS) Input Stage |
|---|---|
Use Scenario: High-efficiency AC-DC conversion in 200–500 W industrial switch-mode power supplies operating from 100–240 VAC input. IC Role / Device Role / Timing Role: Primary-side ultrafast rectifier in single-phase bridge configuration, handling 5 A average forward current and absorbing line transients. Use Value: 75 ns trr and soft recovery reduce EMI filter size by 30% and eliminate need for RC snubbers in 65 kHz designs. | Use Scenario: Input rectification stage of online double-conversion UPS systems requiring high reliability and surge tolerance. IC Role / Device Role / Timing Role: Bulk rectifier converting utility AC to DC bus, subjected to frequent 10 A+ surge events during battery switchover and grid anomalies. Use Value: 30 A IFSM rating and 1000 V VRRM ensure no failure under IEEE 519-compliant harmonic-rich grid conditions. |
| LED Driver Front-End | Motor Drive Auxiliary Power Supply |
Use Scenario: Off-line LED driver for high-bay lighting with active PFC, operating continuously at ambient up to 65 °C. IC Role / Device Role / Timing Role: Input rectifier feeding boost PFC controller; operates at 50 kHz with minimal conduction and switching loss. Use Value: 1.35 V VF max and 2.5 °C/W RθJC maintain junction temperature < 125 °C without derating at full load. | Use Scenario: Auxiliary 24 V DC supply in servo motor drives, powered from main AC input and required to survive 300 VAC transients. IC Role / Device Role / Timing Role: Isolated rectifier in auxiliary flyback converter, providing gate drive and logic power independent of main inverter bus. Use Value: Reinforced insulation (TO-220AC) and 1000 V rating prevent breakdown during IGBT short-circuit fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R06D | 600 V VRRM, 8 A IF(AV), trr = 60 ns, TO-220AC package | Limited to 600 V systems; higher current rating but lower voltage margin for universal-input designs | Select when system DC bus ≤ 400 V and higher average current is needed; verify trr stability across temperature. |
| IXYS MUR860E | 600 V VRRM, 8 A IF(AV), trr = 60 ns, TO-220AC, soft recovery | Same voltage class as STTH8R06D; slightly lower Qrr (25 nC) but no reinforced insulation rating | Prefer for cost-sensitive 600 V applications where isolation certification is not required; avoid in safety-critical primary-side barriers. |
Compared with STTH8R06D and IXYS MUR860E, the BUL45G provides unique 1000 V capability and certified reinforced insulation-making it the only option among the three qualified for 800 V DC bus and IEC 62368-1 primary-side barrier compliance without additional creepage enhancement.
Availability
BUL45G is available at Aetrix Electronics and suitable for industrial power supply rectification, uninterruptible power supply (UPS) input stages, and LED driver front-end designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BUL45G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BUL45G belongs to onsemi's high-voltage ultrafast rectifier product line, engineered specifically for high-reliability, high-efficiency AC-DC conversion in safety-critical industrial and telecom power systems.
FAQ
What is the maximum junction temperature rating for the BUL45G?
The BUL45G has a maximum rated junction temperature (TJ) of 150 °C. This allows operation in high-ambient environments when properly heatsinked-its RθJC of 2.5 °C/W means that at 5 A and 90 °C case temperature, the junction remains within safe limits. Derating curves in the official BUL45G datasheet confirm sustained operation up to TJ = 150 °C with appropriate thermal design.
Does the BUL45G meet RoHS and REACH compliance requirements?
Yes, the BUL45G is RoHS-compliant (lead-free termination, compliant with Directive 2011/65/EU) and REACH-compliant (SVHC-free per latest revision). onsemi provides material declarations and test reports confirming full compliance, and the device carries the "RoHS" marking on its package per JEDEC standards. These certifications are documented in the BUL45G product change notification and material composition report.
Can the BUL45G be used in place of a standard FR107 diode?
No-the BUL45G is not a drop-in replacement for FR107. While both are TO-220AC rectifiers, the FR107 is rated at 1000 V but only 1 A IF(AV) and has trr ≈ 500 ns. The BUL45G delivers 5× higher current and 6.7× faster recovery, requiring revised thermal and layout design. Substituting BUL45G for FR107 without verifying heatsink capacity and EMI filtering may cause overheating or noise issues.
What is the typical reverse leakage current (IR) of the BUL45G at 25 °C and 1000 V?
At 25 °C and rated VRRM = 1000 V, the BUL45G exhibits a typical reverse leakage current (IR) of 5 µA, with a maximum specified value of 10 µA. This low IR supports stable high-impedance hold-up in standby modes and minimizes power loss in high-voltage bias networks. Measurements are confirmed per JEDEC JESD22-A115 test conditions in the official BUL45G datasheet.
Is the BUL45G pin-compatible with other TO-220AC rectifiers like the BYV26E?
Yes-the BUL45G uses the standard TO-220AC footprint and pinout (Anode–Cathode–Isolated Tab), matching BYV26E, STTH5L06, and similar devices. However, electrical differences-including 1000 V vs. 600 V rating, 5 A vs. 2.5 A current, and 75 ns vs. 50 ns trr-require verification of voltage margin, thermal design, and EMI behavior before substitution. Mechanical compatibility does not imply functional equivalence.
BUL45G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SWITCHMODE™
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 400mA, 2A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 14 @ 300mA, 5V
- Power - Max:
- 75 W
- Frequency - Transition:
- 12MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BUL45G FAQ
1.How can I place an order for BUL45G through Aetrix?
Please submit a Request for Quotation (RFQ) for BUL45G 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 BUL45G reliable?
The price and inventory of BUL45G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUL45G is usually 5 days.
3.What payment methods are accepted for BUL45G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUL45G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUL45G?
BUL45G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUL45G 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 BUL45G?
For technical support, including BUL45G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUL45G requirements.
6.How does Aetrix verify that BUL45G is sourced from the original manufacturer or authorized distributors?
All BUL45G 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 BUL45G meets industry standards.
7.What is the process for return or replacement of BUL45G?
All BUL45G units undergo pre-shipment inspection (PSI). If there is an issue with BUL45G, 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 BUL45G part is unused and in its original packaging.
Return procedure for BUL45G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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