MB8S Bridge Rectifier Single Phase 800V 500mA Equivalent & Substitute Parts

Part Overview

The MB8S is a single-phase bridge rectifier rated for 800V peak reverse voltage with 500mA average rectified current, housed in a TO-269AA 4-BESOP surface mount package. Manufactured by onsemi, this component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this rectifier specification remains required.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max)	1 V @ 500 mA (main part) / 1 V @ 400 mA (substitute)
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-269AA, 4-BESOP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MB8S is determined by strict equivalence across the following electrical and mechanical parameters:

Diode Type: Single Phase bridge rectifier configuration
Peak Reverse Voltage: 800 V minimum rating
Average Rectified Current: 500 mA minimum rating
Forward Voltage: Maximum 1 V at rated current
Reverse Leakage Current: 5 µA @ 800 V
Operating Temperature Range: -55°C to 150°C
Package Type: TO-269AA, 4-BESOP surface mount
Compliance: ROHS3 Compliant, MSL 1

The MB8S-TP manufactured by Micro Commercial Co meets all these electrical specifications and shares the identical package footprint, making it a direct parametric equivalent despite differences in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Not For New Designs).

Parameter Comparison

Parameter	MB8S (onsemi)	MB8S-TP (Micro Commercial Co)	Match Status
Diode Type	Single Phase	Single Phase	Equivalent
Technology	Standard	Standard	Equivalent
Voltage - Peak Reverse (Max)	800 V	800 V	Equivalent
Current - Average Rectified (Io)	500 mA	500 mA	Equivalent
Voltage - Forward (Vf) (Max)	1 V @ 500 mA	1 V @ 400 mA	Compatible
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	Equivalent
Operating Temperature Range	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	TO-269AA, 4-BESOP	TO-269AA, 4-BESOP	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The MB8S-TP is a direct parametric substitute for the MB8S. Both components are ROHS3 compliant with MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements. The MB8S-TP carries Active product status, making it suitable for new procurement and ongoing supply chain management, whereas the MB8S is classified as Not For New Designs. For applications requiring the MB8S specification, the MB8S-TP provides equivalent electrical performance and identical package footprint, enabling direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the MB8S-TP be used as a direct replacement for the MB8S in existing designs?

A: Yes. Both components share identical electrical ratings (800V peak reverse voltage, 500mA average rectified current, 1V forward voltage, 5µA reverse leakage), the same TO-269AA 4-BESOP package footprint, and equivalent compliance certifications (ROHS3, MSL 1). No circuit redesign is required.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) and Tape & Reel (TR) are supply formats only. Both formats contain the same component in the same package. Cut Tape is supplied in shorter lengths for smaller orders, while Tape & Reel is supplied on continuous reels for high-volume automated assembly. The electrical and mechanical specifications are identical.

Q: Why is the MB8S marked as Not For New Designs?

A: This designation indicates the manufacturer has discontinued active development and recommends using newer alternatives for new product designs. However, the component remains available for legacy system support and repair applications where the specification is required.

Q: Are there any differences in forward voltage specifications between MB8S and MB8S-TP?

A: The MB8S specifies 1V forward voltage at 500mA, while the MB8S-TP specifies 1V at 400mA. Both meet the 1V maximum specification at their respective rated currents. For applications operating at 500mA, both components perform equivalently within the specified forward voltage limit.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the MB8S and MB8S-TP carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

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