KBU404G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU404G is a single-phase bridge rectifier manufactured by Taiwan Semiconductor Corporation, designed for applications requiring 400 V peak reverse voltage and 4 A average rectified current. This through-hole component operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP KBU package. The part maintains Active product status and holds ROHS3 compliance with unlimited moisture sensitivity rating. Bridge rectifiers of this specification are essential in AC-to-DC conversion circuits, power supply designs, and industrial control applications where reliable rectification at moderate voltage and current levels is required.

Substiute Parts

KBU404G

Taiwan Semiconductor CorporationIn Stock: 1230KBU404G Datasheet

Current PartRFQ

KBU404G

Taiwan Semiconductor CorporationIn Stock: 1230KBU404G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KBU404G is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Voltage - Peak Reverse (Max): 400 V
• Current - Average Rectified (Io): 4 A
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 4 A
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V

Physical & Operational Characteristics:

• Diode Type: Single Phase
• Technology: Standard
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Through Hole
• Package / Case: 4-SIP, KBU

Compliance & Status:

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

A substitute part must match all electrical parameters, maintain identical mounting and package specifications, operate within the specified temperature range, and retain Active product status with equivalent compliance certifications. Deviations in any of these parameters disqualify a component from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The KBU404G maintains Active product status with full ROHS3 compliance and unlimited moisture sensitivity rating, ensuring suitability for current production and long-term deployment in regulated environments. The component's through-hole 4-SIP KBU package provides robust mechanical connection suitable for high-reliability applications and manual assembly processes.

Selection of equivalent bridge rectifiers must prioritize exact parameter matching across voltage, current, and thermal specifications. The 400 V peak reverse voltage and 4 A average rectified current define the operational envelope; components deviating from these values introduce circuit incompatibility. Forward voltage characteristics at rated current directly impact power dissipation and thermal management; the 1.1 V specification at 4 A must be maintained for accurate circuit design calculations.

Compliance certifications—specifically ROHS3 status and MSL rating—ensure compatibility with modern manufacturing standards and supply chain requirements. Active product status guarantees continued availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: What defines a valid substitute for the KBU404G bridge rectifier?

A: A valid substitute must match all electrical parameters (400 V peak reverse voltage, 4 A average rectified current, 1.1 V forward voltage at 4 A, 5 µA reverse leakage at 400 V), maintain identical single-phase diode type and standard technology classification, operate within the -55°C to 150°C temperature range, use through-hole mounting in a 4-SIP KBU package, and retain Active product status with ROHS3 compliance.

Q: Can bridge rectifiers with higher voltage or current ratings substitute for the KBU404G?

A: No. Higher-rated components introduce unnecessary cost and may alter circuit performance characteristics. Substitution requires exact parameter matching, not over-specification. Components with different electrical ratings are not interchangeable.

Q: Is the 4-SIP KBU package critical for substitution?

A: Yes. The package type determines physical dimensions, pin configuration, and mounting compatibility. Through-hole mounting in the 4-SIP KBU package is mandatory for direct substitution. Alternative package types require circuit board redesign and are not considered equivalent substitutes.

Q: What is the significance of the 1.1 V forward voltage specification?

A: Forward voltage directly affects power dissipation (P = Vf × Io) and thermal performance. At 4 A, the 1.1 V specification results in 4.4 W dissipation per bridge rectifier. Deviations alter heat generation and may compromise thermal design margins in the application circuit.

Q: Does ROHS3 compliance affect substitution eligibility?

A: Yes. ROHS3 compliance is a mandatory requirement for modern electronics manufacturing and supply chain integration. Substitute components must maintain equivalent compliance status to ensure regulatory and procurement compatibility.

Q: Can the KBU404G be used in applications requiring lower voltage or current ratings?

A: Yes. A component rated for 400 V and 4 A operates safely in applications requiring lower specifications, provided the circuit design accounts for the component's actual electrical characteristics. However, this represents application flexibility, not substitution.

Q: What role does the -55°C to 150°C operating temperature range play in substitution?

A: The temperature range defines the component's thermal operating envelope. Substitute components must support the identical range to ensure reliable operation across all specified environmental conditions. Deviations may introduce failure risk in temperature-sensitive applications.