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Diodes Incorporated KBP408G
- Part No.:
- KBP408G
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-SIP, KBP
- Datasheet:
-
KBP408G.pdf
- Description:
- BRIDGE RECT 1PHASE 800V 4A KBP
- Quantity:
- Payment:
- Shipping:
Inventory:31
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Product details
Overview
KBP408G from Diodes Incorporated is a 4.0A, 800V peak repetitive reverse voltage (VRRM) standard recovery bridge rectifier in KBP package, featuring 1.1V max forward voltage at 4.0A, 5μA max reverse leakage at 1000V/25°C, and 130A non-repetitive surge rating - used for AC/DC full-wave rectification in LED lighting power supplies and office equipment.
For engineers reviewing the KBP408G datasheet, KBP408G pinout, KBP408G application, or KBP408G equivalent, key selection criteria include VRRM derating for capacitive loads, thermal resistance (RθJC = 6°C/W with heatsink), IFSM surge capability, and UL recognition (E95060) for safety-critical board-level deployments.
Technical Context
This single-phase, full-wave bridge rectifier integrates four silicon diodes in a common cathode/anode configuration to convert AC input into unidirectional DC output. It operates across -55°C to +150°C junction temperature range and supports both resistive and inductive loads at 60Hz.
Thermal performance is defined by two distinct RθJA values: 15°C/W with heatsink (75mm × 75mm × 1.6mm Cu plate) and 40°C/W without heatsink - requiring explicit thermal design consideration based on ambient and mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - maximum peak reverse voltage the device withstands without breakdown; defines safe AC input voltage ceiling (e.g., ≤560V RMS). |
| IO (TC=105°C) | 4.0 A - average rectified current with heatsink; derates to 2.0A without heatsink. |
| VF (IF=4.0A) | 1.1 V max - forward voltage drop per diode element; determines conduction loss (≈4.4W total at full load). |
| IR (VR=1000V) | 5 μA max @ 25°C - low reverse leakage ensures minimal standby power loss in high-impedance circuits. |
| IFSM (8.3ms) | 130 A - surge current rating for transient line events; enables robustness against inrush in transformer-fed supplies. |
| RθJC | 6 °C/W - junction-to-case thermal resistance with heatsink; critical for calculating die temperature rise under load. |
Pinout & Package
Package: KBP - molded plastic case (UL 94V-0), 1.52g weight, lead finish: bright tin, polarity marked on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ~ (AC1) | AC Input Terminal 1 | One of two AC input nodes; connects to live/neutral side of transformer secondary or AC line. |
| ~ (AC2) | AC Input Terminal 2 | Second AC input node; completes full-wave bridge input path with AC1. |
| + (DC+) | Positive DC Output | Anode of internal upper diodes; delivers rectified positive output to filter capacitor/load. |
| – (DC–) | Negative DC Output / Common Return | Cathode of internal lower diodes; serves as circuit ground reference and return path. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die construction | Enhances long-term reliability and moisture resistance in humid environments (e.g., indoor LED drivers). |
| UL Recognized File # E95060 | Validates compliance with UL/CSA safety standards for end-equipment certification in North America. |
| Surge overload rating: 130A (8.3ms) | Withstands transformer inrush and lightning-induced transients without failure in AC/DC front-end stages. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU; suitable for environmentally regulated industrial and consumer products. |
Applications
| LED Lighting Power Supply | Office Equipment AC/DC Adapter |
|---|---|
Use Scenario: Rectifying 120/230VAC mains to DC for constant-current LED driver ICs in downlights and panel lights. IC Role / Device Role / Timing Role: Full-wave bridge rectifier providing unidirectional DC bus prior to PFC and DC-DC conversion stages. Use Value: Low IR (5μA) minimizes no-load power loss; 800V VRRM accommodates 230VAC + 20% tolerance and line surges. | Use Scenario: Converting AC input in compact wall-wart adapters for printers, scanners, and monitors. IC Role / Device Role / Timing Role: Primary rectification stage delivering bulk DC to downstream switching regulators. Use Value: KBP package enables high-power density PCB layout; UL recognition simplifies adapter safety certification. |
| Home Appliance Power Input | Telecom Wall-Mounted Power Module |
Use Scenario: Mains rectification in washing machine control boards and microwave oven logic supplies. IC Role / Device Role / Timing Role: Standard recovery bridge handling 50/60Hz input with inductive load compatibility. Use Value: 130A IFSM protects against motor startup surges; -55°C to +150°C rating supports wide ambient operation. | Use Scenario: AC/DC front-end in telecom-grade power modules for VoIP phones and small base stations. IC Role / Device Role / Timing Role: Isolated AC input rectification feeding regulated DC outputs for digital signal processing. Use Value: Glass passivation improves humidity resistance in non-hermetic enclosures; RoHS 3 compliance meets telecom supply chain requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBU8K (ON Semiconductor) | Same KBP package, 800V VRRM, but 1.05V VF max at 4A; slightly lower RθJA (14°C/W w/ heatsink). | Higher efficiency at light loads due to lower VF; identical thermal mounting requirements. | Select when optimizing for conduction loss in thermally constrained designs. |
| GBU8J (Vishay) | Same 800V/4A rating, but 1.2V VF max; higher IR (10μA) and lower IFSM (100A). | Reduced surge margin and higher standby loss; otherwise pin-identical. | Acceptable where cost sensitivity outweighs surge robustness and leakage targets. |
Compared with GBU8K and GBU8J, KBP408G offers superior surge immunity (130A vs. ≤100A), lowest leakage (5μA), and UL recognition - making it preferred for safety-certified, high-reliability AC/DC front-ends.
Availability
KBP408G is available at Aetrix Electronics and suitable for LED lighting power supplies, office equipment AC/DC adapters, and home appliance control boards requiring stable component supply and UL-recognized rectification.
Supply support for KBP408G 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 KBP series belongs to Diodes' standard recovery bridge rectifier product line, engineered for cost-effective, high-surge-capability AC/DC conversion in consumer, industrial, and telecom power supplies.
FAQ
What is the maximum operating temperature for KBP408G?
KBP408G has an operating junction temperature range of -55°C to +150°C. Its thermal resistance depends on mounting: RθJA is 15°C/W with a 75mm × 75mm × 1.6mm copper heatsink, but rises to 40°C/W without heatsink - requiring derating to 2.0A average current in free-air conditions.
Can KBP408G be used in capacitive-input filter applications?
Yes, but with 20% current derating per datasheet guidance. For example, its rated 4.0A average output must be limited to 3.2A when driving a large electrolytic capacitor directly after rectification - due to increased peak currents and associated thermal stress on the diode junctions.
Is KBP408G automotive-qualified?
No - KBP408G is not AEC-Q101 qualified. While it operates from -55°C to +150°C, Diodes specifies that automotive use requires explicit AEC-Q101 qualification, PPAP capability, and IATF 16949 manufacturing - which this part does not carry unless specially ordered and designated.
How is polarity marked on the KBP408G package?
Polarity is marked on the top surface of the KBP package: a white band identifies the DC+ (positive) output terminal, while the opposite corner marks the DC– (negative/common) terminal. The two unmarked terminals are the AC inputs (~), arranged diagonally across the bridge.
KBP408G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SIP, KBP
- 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:
- 1.1 V @ 4 A
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- KBP
KBP408G FAQ
1.How can I place an order for KBP408G through Aetrix?
Please submit a Request for Quotation (RFQ) for KBP408G 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 KBP408G reliable?
The price and inventory of KBP408G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KBP408G is usually 5 days.
3.What payment methods are accepted for KBP408G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KBP408G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KBP408G?
KBP408G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KBP408G 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 KBP408G?
For technical support, including KBP408G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KBP408G requirements.
6.How does Aetrix verify that KBP408G is sourced from the original manufacturer or authorized distributors?
All KBP408G 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 KBP408G meets industry standards.
7.What is the process for return or replacement of KBP408G?
All KBP408G units undergo pre-shipment inspection (PSI). If there is an issue with KBP408G, 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 KBP408G part is unused and in its original packaging.
Return procedure for KBP408G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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