KBU406G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU406G is a single-phase bridge rectifier manufactured by Taiwan Semiconductor Corporation, designed for applications requiring full-wave rectification at 800 V peak reverse voltage with 4 A average rectified current. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Bridge rectifiers serve as essential power conversion components in AC-to-DC conversion circuits, industrial power supplies, and motor control applications. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and procurement optimization when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

KBU406G

Taiwan Semiconductor CorporationIn Stock: 4903KBU406G Datasheet

Current PartRFQ

KBU406G

Taiwan Semiconductor CorporationIn Stock: 4903KBU406G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KBU406G bridge rectifier is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• 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 Range: -55°C to 150°C (TJ)
• Mounting Type: Through Hole
• Package / Case: 4-SIP, KBU
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Only components meeting all specified electrical and mechanical parameters within the defined tolerances qualify as direct substitutes. No parameter relaxation or uprating is applied in this substitution analysis.

Parameter Comparison

Engineering Selection Recommendations

The KBU406G bridge rectifier is an active product with full regulatory compliance across RoHS3, REACH, and MSL classifications. When selecting equivalent or substitute components, the following engineering criteria apply:

Compliance Verification: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure compatibility with current regulatory frameworks and procurement standards.

Product Status: Only active products with confirmed manufacturing status should be selected for new designs and production applications. This ensures long-term availability and consistent quality standards.

Electrical Equivalence: Substitutes must match the specified voltage rating (800 V peak reverse), current capacity (4 A average rectified), forward voltage drop (1.1 V @ 4 A), and reverse leakage characteristics (5 µA @ 800 V) without deviation.

Thermal Performance: The operating temperature range of -55°C to 150°C (TJ) must be maintained to ensure reliable operation across the full application temperature envelope.

Package Compatibility: The 4-SIP, KBU through-hole package format is mandatory for mechanical and electrical compatibility with existing PCB designs and socket configurations.

Moisture Sensitivity: MSL 1 (Unlimited) rating ensures no special handling or storage requirements, simplifying logistics and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: What defines a direct substitute for the KBU406G bridge rectifier?

A: A direct substitute must match all electrical parameters (800 V peak reverse voltage, 4 A average rectified current, 1.1 V forward voltage drop, 5 µA reverse leakage), maintain the same operating temperature range (-55°C to 150°C), use identical through-hole 4-SIP KBU packaging, and maintain ROHS3 compliance and REACH unaffected status.

Q: Can a bridge rectifier with higher voltage or current rating be used as a substitute?

A: No. Substitution requires exact parameter matching. Components with higher ratings are not interchangeable as they represent different product specifications and may introduce design complications, cost inefficiencies, or thermal management issues.

Q: Is the KBU406G suitable for applications requiring higher current capacity?

A: No. The KBU406G is rated for 4 A average rectified current. Applications requiring higher current must specify a different bridge rectifier model with appropriate current rating.

Q: What is the significance of the 4-SIP, KBU package format?

A: The 4-SIP (Single In-line Package) KBU format is a standardized through-hole package for single-phase bridge rectifiers. This package format determines PCB footprint, lead spacing, and mechanical compatibility. Substitutes must use identical packaging to ensure direct board-level compatibility.

Q: Does the MSL 1 (Unlimited) rating affect component handling?

A: No. MSL 1 (Unlimited) indicates no moisture sensitivity restrictions. The component does not require special dry-pack storage, desiccant handling, or bake-out procedures prior to soldering.

Q: Are there any thermal considerations when selecting a substitute?

A: Yes. The operating temperature range of -55°C to 150°C (TJ) must be maintained. Substitutes must be rated for this full temperature envelope to ensure reliable operation in the target application environment.

Q: What compliance certifications must a substitute maintain?

A: Substitute components must maintain ROHS3 compliance and REACH unaffected status. These certifications ensure regulatory compliance and compatibility with modern procurement and environmental standards.

Q: Can the KBU406G be used in three-phase rectification applications?

A: No. The KBU406G is specified as a single-phase bridge rectifier. Three-phase applications require different rectifier configurations and component specifications.