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Diodes Incorporated KBJ408G
- Part No.:
- KBJ408G
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-SIP, KBJ
- Datasheet:
-
KBJ408G.pdf
- Description:
- BRIDGE RECT 1PHASE 800V 4A KBJ
- Quantity:
- Payment:
- Shipping:
Inventory:20
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Product details
Overview
KBJ408G from Diodes Incorporated is a 4.0A, 800V standard recovery bridge rectifier in a KBJ through-hole package, featuring 1.0V max forward voltage at 2.0A, 5.0µA max reverse leakage at 25°C, 120A peak surge rating, and UL 94V-0 molded plastic housing-used for AC/DC conversion in offline power supplies and industrial motor controls.
For engineers reviewing the KBJ408G datasheet, KBJ408G pinout, KBJ408G application, or KBJ408G equivalent, this device supports high-reliability mains-input rectification where thermal stability, low IR, and 1500VRMS dielectric strength are critical design requirements.
Technical Context
This single-phase full-wave bridge rectifier integrates four silicon diodes in a common cathode/anode configuration with glass-passivated junctions. It operates across -55°C to +150°C junction temperature and delivers 4.0A average output current when mounted on a 75mm × 75mm × 1.6mm aluminum heatsink.
Its 5.5°C/W typical junction-to-case thermal resistance and 40pF junction capacitance (measured at 1MHz, 4V reverse bias) support stable performance in 50/60Hz line-frequency applications without high-frequency switching artifacts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive peak reverse voltage; defines safe AC input voltage ceiling before breakdown. |
| IF(AV) | 4.0 A - Average rectified output current at TJ = +150°C with heatsink; sets continuous DC load capability. |
| VF Max | 1.0 V @ 2.0A - Forward voltage drop; determines conduction loss and thermal dissipation in linear operation. |
| IR Max | 5.0 µA @ 25°C - Reverse leakage current; impacts standby power and insulation integrity in high-impedance circuits. |
| IFSM | 120 A - Non-repetitive peak forward surge current (8.3ms half-sine); withstands inrush during cold-start. |
| RθJC | 5.5 °C/W - Junction-to-case thermal resistance; enables heatsink sizing for thermal management under load. |
Pinout & Package
Package: KBJ molded plastic case, UL 94V-0 rated, tin-plated leads, through-hole mountable with #6 screw and 5.0 in-lbs max torque. Weight: ~4.6 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | Input AC Terminal 1 | One of two AC input nodes; connects to live/neutral side of transformer secondary or mains input. |
| AC2 | Input AC Terminal 2 | Second AC input node; completes full-wave bridge input path with AC1. |
| + (Anode Common) | Positive DC Output | Full-wave rectified positive output node; feeds bulk capacitor or downstream regulator. |
| – (Cathode Common) | Negative DC Output | Full-wave rectified negative/return node; serves as system ground reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die construction | Enhances long-term reliability and moisture resistance in humid or thermally cycled environments. |
| 1500VRMS dielectric strength | Ensures isolation safety between AC inputs and DC outputs per IEC/UL standards for Class II equipment. |
| 120A peak surge rating | Supports repeated cold-start events in motor drives and industrial SMPS without degradation. |
| RoHS-compliant lead-free finish | Meets EU RoHS 3 (2015/863/EU) and automotive change-control readiness per AEC-Q200 alignment. |
Applications
| Industrial Power Supplies | AC Motor Drives |
|---|---|
Use Scenario: Rectifying 230VAC mains input in DIN-rail-mounted 24V/48V industrial PSUs. IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting AC to unregulated DC prior to bulk filtering and regulation. Use Value: 800V VRRM and 120A IFSM ensure robustness against line surges and transformer inrush currents. | Use Scenario: Input stage of three-phase inverter front-end (single-phase variant) for HVAC blowers. IC Role / Device Role / Timing Role: Mains-side rectification feeding DC bus capacitors in variable-frequency drive input stages. Use Value: 5.5°C/W RθJC and 1500VRMS isolation enable reliable operation under sustained 4A load and EMI-prone factory environments. |
| LED Streetlight Drivers | Appliance Control Boards |
Use Scenario: Off-line constant-current LED driver powering 40W–100W outdoor luminaires. IC Role / Device Role / Timing Role: Primary rectifier delivering high-voltage DC bus for flyback or buck-boost converter stages. Use Value: Low 5.0µA IR at 25°C minimizes no-load power loss and improves energy efficiency compliance (e.g., ERP Tier 2). | Use Scenario: Embedded control board in washing machine or dishwasher requiring isolated AC sensing and relay drive. IC Role / Device Role / Timing Role: Auxiliary rectifier powering microcontroller and relay coil supply rails from internal transformer. Use Value: UL Recognized Component status (E95060) and 94V-0 housing satisfy end-product safety certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard recovery bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBU8K | Same 800V VRRM and 4A IF(AV), but GBU package (larger footprint, higher RθJC ≈ 7.0°C/W). | Less compact PCB layout; requires larger heatsink area for same thermal margin. | Select when existing GBU footprint compatibility is required over KBJ space constraints. |
| KBPC408 | Identical electrical specs, but KBPC package (square base, 4-pin inline) and non-RoHS lead finish. | Not compliant with RoHS 3 or automotive PPAP-ready sourcing; legacy manufacturing process. | Choose only for backward-compatible repair or non-regulated markets with legacy BOMs. |
Compared with GBU8K and KBPC408, KBJ408G offers superior thermal performance in minimal PCB area and full RoHS 3 compliance-critical for new industrial and outdoor lighting designs requiring certification and lifecycle assurance.
Availability
KBJ408G is available at Aetrix Electronics and suitable for industrial power supplies, AC motor drives, LED streetlight drivers, and appliance control boards requiring stable component supply, long-term manufacturability, and UL-recognized safety compliance.
Supply support for KBJ408G 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
KBJ408G belongs to Diodes' standard recovery bridge rectifier product line, engineered for cost-effective, high-reliability AC/DC conversion in mains-powered industrial, commercial, and consumer equipment.
FAQ
What is the maximum operating temperature for KBJ408G?
KBJ408G has a specified junction temperature range of -55°C to +150°C. Its 4.0A average current rating assumes mounting on a 75mm × 75mm × 1.6mm aluminum heatsink at TJ = +150°C. Derating is required above ambient temperatures exceeding +40°C without forced cooling.
Is KBJ408G suitable for high-frequency switching applications?
No-KBJ408G is a standard recovery rectifier with no specified reverse recovery time (trr). Its 40pF junction capacitance and lack of fast-recovery optimization make it unsuitable for PWM frequencies above 20kHz. Use fast or ultrafast rectifiers (e.g., UF4007) for switch-mode topologies.
Does KBJ408G require a heatsink for 4A continuous operation?
Yes-its 5.5°C/W junction-to-case thermal resistance necessitates a heatsink to maintain TJ ≤ +150°C at 4.0A. Without heatsinking, derated continuous current is approximately 1.2A at +25°C ambient, based on RθJA ≈ 45°C/W for typical PCB layouts.
How is polarity marked on the KBJ408G package?
Polarity is molded directly onto the plastic body: "+" and "–" symbols identify the DC output terminals, while "~" symbols (or AC markings) indicate the two AC input pins. The physical layout follows standard KBJ orientation-AC1 and AC2 on left/right, + on top right, – on bottom right when viewed with marking side up and leads downward.
KBJ408G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SIP, KBJ
- Packaging:
- Tube
- Product Status:
- Active
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 800 V
- Current - Average Rectified (Io):
- 4 A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 2 A
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- KBJ
KBJ408G FAQ
1.How can I place an order for KBJ408G through Aetrix?
Please submit a Request for Quotation (RFQ) for KBJ408G 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 KBJ408G reliable?
The price and inventory of KBJ408G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KBJ408G is usually 5 days.
3.What payment methods are accepted for KBJ408G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KBJ408G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KBJ408G?
KBJ408G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KBJ408G 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 KBJ408G?
For technical support, including KBJ408G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KBJ408G requirements.
6.How does Aetrix verify that KBJ408G is sourced from the original manufacturer or authorized distributors?
All KBJ408G 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 KBJ408G meets industry standards.
7.What is the process for return or replacement of KBJ408G?
All KBJ408G units undergo pre-shipment inspection (PSI). If there is an issue with KBJ408G, 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 KBJ408G part is unused and in its original packaging.
Return procedure for KBJ408G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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