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Diodes Incorporated KBJ404G
- Part No.:
- KBJ404G
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-SIP, KBJ
- Datasheet:
-
KBJ404G.pdf
- Description:
- BRIDGE RECT 1PHASE 400V 4A KBJ
- Quantity:
- Payment:
- Shipping:
Inventory:2
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Product details
Overview
KBJ404G from Diodes Incorporated is a 4.0A standard recovery bridge rectifier with 400V maximum repetitive peak reverse voltage (VRRM), 1.0V forward voltage at 2.0A, and 5.0µA reverse leakage current at 25°C, designed for AC-to-DC conversion in offline power supplies and industrial control power stages.
For engineers reviewing the KBJ404G datasheet, KBJ404G pinout, KBJ404G application, or KBJ404G equivalent, this device supports through-hole PCB mounting with #6 screw fastening, delivers 120A surge capability, and meets UL Recognized Component Index E95060 and RoHS 3 compliance for regulated industrial and consumer power designs.
Technical Context
The KBJ404G integrates four silicon diodes in a single-phase full-wave bridge configuration with glass-passivated die construction, enabling stable operation across -55°C to +150°C junction temperature range. Its 1500VRMS case dielectric strength ensures isolation integrity in mains-connected circuits.
Thermal resistance from junction to case is 5.5°C/W when mounted on a 75mm × 75mm × 1.6mm aluminum heatsink, supporting continuous 4.0A average output current at TJ = +150°C. Typical junction capacitance is 40pF at 1.0MHz and 4.0V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Withstands up to 400V repetitive reverse voltage in AC line applications without breakdown. |
| IF(AV) | 4.0 A - Sustains 4.0A average forward current at TJ = +150°C with appropriate heatsinking. |
| VF @ 2.0A | 1.0 V - Forward drop limits conduction loss to ≤2.0W per half-cycle at rated DC load current. |
| IR @ 25°C | 5.0 µA - Low leakage preserves efficiency in high-impedance hold-up or standby circuits. |
| IFSM | 120 A - Handles 8.3ms half-sine surge transients common during cold-start or capacitor charging. |
| RθJC | 5.5 °C/W - Enables thermal design with measurable junction-to-heatsink temperature rise under load. |
| CT | 40 pF - Junction capacitance affects high-frequency noise coupling and EMI filter interaction. |
Pinout & Package
Package: KBJ molded plastic housing (UL 94V-0), through-hole mountable with #6 screw, tin-plated leads, 4.6g weight, polarity marked on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | Input AC Terminal 1 | Connects to one leg of AC input; forms half of bridge input pair. |
| AC2 | Input AC Terminal 2 | Connects to second leg of AC input; completes full-wave AC input interface. |
| + (Anode Output) | Positive DC Output | Delivers rectified positive DC voltage to downstream filter and regulation stages. |
| – (Cathode Output) | Negative DC Output | Serves as return path and reference ground for DC output circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enhances long-term reliability and moisture resistance in humid or thermally cycling environments. |
| 1500VRMS dielectric strength | Meets reinforced insulation requirements for Class II AC/DC power supplies without additional barriers. |
| 120A peak surge rating | Survives inrush currents from large bulk capacitors without degradation or failure. |
| UL Recognized (E95060) | Validates safety compliance for end-equipment certification in North America and globally harmonized markets. |
| RoHS 3 compliant / lead-free | Supports environmental compliance for CE-marked and export-controlled industrial electronics. |
Applications
| Industrial Motor Drives | LED Streetlight Power Supplies |
|---|---|
Use Scenario: AC mains-fed rectification stage feeding buck PFC and isolated flyback converters in outdoor-rated lighting systems. IC Role / Device Role / Timing Role: Primary bridge rectifier converting 230VAC input to unregulated DC bus before power factor correction. Use Value: 400V VRRM safely accommodates 230VAC ±10% with margin; low IR minimizes standby losses during dusk-to-dawn operation. | Use Scenario: Input rectification in sealed, convection-cooled LED drivers deployed in highway infrastructure. IC Role / Device Role / Timing Role: Full-wave bridge providing robust DC input to constant-current LED driver ICs. Use Value: 120A IFSM withstands repeated cold starts in sub-zero ambient; UL recognition simplifies regional safety approvals. |
| Appliance Control Boards | AC-DC Wall Adapters |
Use Scenario: Mains-powered control logic boards in washing machines and HVAC controllers requiring isolated auxiliary supply. IC Role / Device Role / Timing Role: Bridge rectifier feeding linear regulator or small SMPS for microcontroller and sensor power rails. Use Value: Through-hole KBJ package enables mechanical stability under vibration; 5.5°C/W RθJC allows compact heatsink integration. | Use Scenario: Input-stage rectification in universal-input (90–264VAC) 12V/24V wall adapters for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Standard-recovery bridge delivering DC bus to primary-side controller and transformer. Use Value: 4.0A IF(AV) supports >30W output with derating; RoHS 3 compliance meets global retail packaging mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBU4K | Same 400V VRRM and 4.0A IF(AV), but GBU package has lower thermal resistance (4.5°C/W) and higher IFSM (140A). | Preferred where higher surge immunity or tighter thermal budget is required in space-constrained adapters. | Select GBU4K if board layout permits larger footprint and heatsink optimization is critical. |
| KBPC404 | Identical electrical specs (400V/4A), but KBPC package uses larger metal heat sink tab and requires different mounting hardware. | Better suited for chassis-mounted industrial power supplies needing direct metal-to-chassis thermal transfer. | Choose KBPC404 when mechanical mounting to metal enclosure is preferred over PCB screw-mounting. |
Compared with GBU4K and KBPC404, the KBJ404G offers optimized balance of PCB-mount convenience, UL recognition, and RoHS compliance-making it ideal for certified, volume-manufactured consumer and industrial power supplies where standardized through-hole assembly is prioritized.
Availability
KBJ404G is available at Aetrix Electronics and suitable for industrial motor drives, LED streetlight power supplies, appliance control boards, and AC-DC wall adapters requiring stable component supply, consistent lot-to-lot performance, and long-term production continuity.
Supply support for KBJ404G 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.
The KBJ series belongs to Diodes' standard-recovery bridge rectifier product line, engineered for cost-effective, reliable AC/DC front-end conversion in mainstream industrial, consumer, and lighting power supplies.
FAQ
What is the maximum operating temperature for KBJ404G?
The KBJ404G has a specified junction temperature range of -55°C to +150°C. Its 4.0A average current rating assumes operation at TJ = +150°C with proper heatsinking-specifically a 75mm × 75mm × 1.6mm aluminum plate. Ambient temperature must be derated accordingly based on actual thermal design.
Is KBJ404G suitable for use in automotive applications?
KBJ404G is not AEC-Q200 qualified and lacks automotive-specific change control, PPAP documentation, or IATF 16949-certified manufacturing traceability. It may be used in non-safety-critical aftermarket accessories, but Diodes recommends contacting their automotive team for AEC-Q200-compliant alternatives like the ABS404Q.
How does the KBJ package differ from KBPC or GBU packages?
The KBJ package is a compact, molded-plastic, four-terminal through-hole bridge with integrated screw-mount feature (for #6 screw). KBPC uses a larger metal heat sink tab requiring chassis mounting, while GBU employs a rectangular plastic body with coplanar leads optimized for wave soldering and higher thermal performance-each differing in footprint, thermal path, and mechanical retention method.
Does KBJ404G require external snubbers in typical applications?
No external snubber is required for standard line-frequency rectification (50/60Hz) due to its standard recovery time and low junction capacitance (40pF). However, snubbers may be needed in high-dv/dt switching environments (e.g., phase-angle dimming circuits) to suppress ringing and reduce EMI-design validation with oscilloscope measurement is recommended.
KBJ404G 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):
- 400 V
- Current - Average Rectified (Io):
- 4 A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 2 A
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 V
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- KBJ
KBJ404G FAQ
1.How can I place an order for KBJ404G through Aetrix?
Please submit a Request for Quotation (RFQ) for KBJ404G 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 KBJ404G reliable?
The price and inventory of KBJ404G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KBJ404G is usually 5 days.
3.What payment methods are accepted for KBJ404G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KBJ404G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KBJ404G?
KBJ404G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KBJ404G 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 KBJ404G?
For technical support, including KBJ404G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KBJ404G requirements.
6.How does Aetrix verify that KBJ404G is sourced from the original manufacturer or authorized distributors?
All KBJ404G 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 KBJ404G meets industry standards.
7.What is the process for return or replacement of KBJ404G?
All KBJ404G units undergo pre-shipment inspection (PSI). If there is an issue with KBJ404G, 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 KBJ404G part is unused and in its original packaging.
Return procedure for KBJ404G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KBJ404G Tags
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