MDB8S Bridge Rectifier Single Phase 800V 1A Equivalent & Substitute Parts

Part Overview

The MDB8S is a single-phase bridge rectifier manufactured by onsemi, rated for 800V peak reverse voltage and 1A average rectified current in a 4-MicroDIP/SMD surface mount package. This component is classified as Not For New Designs, indicating it has been superseded in onsemi's product line. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MDB8S is determined by strict equivalence across the following parameters:

Diode Type: Single Phase
Technology: Standard
Voltage - Peak Reverse (Max): 800 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Operating Temperature Range: -55°C ~ 150°C (TJ)
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing

All listed substitute parts meet these core electrical specifications. Variations in reverse leakage current, packaging format (tape & reel vs. cut tape), and product status are secondary considerations that do not affect functional substitutability within the specified parameter set.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Io	Vf (Max) @ If	Reverse Leakage @ Vr	Operating Temperature	Product Status	RoHS Status
MDB8S	onsemi	800 V	1 A	1.1 V @ 1 A	10 µA @ 800 V	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
DF08S1	onsemi	800 V	1 A	1.1 V @ 1 A	3 µA @ 800 V	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
ABS8U	SMC Diode Solutions	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
ABS8-HF	Comchip Technology	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
B108S_R2_00001	Panjit International Inc.	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DB106S	SMC Diode Solutions	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DBLS106G	Taiwan Semiconductor Corporation	800 V	1 A	1.1 V @ 1 A	2 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DBLS106GH	Taiwan Semiconductor Corporation	800 V	1 A	1.1 V @ 1 A	2 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DF08S-E3/77	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DF08S-E3/I	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant
DF08SA-E3/77	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically compatible with the MDB8S within the specified parameter set. Selection should prioritize parts with Active product status for new applications and long-term supply assurance. The DF08S1 from onsemi maintains the same manufacturer lineage as the MDB8S and is classified as Not For New Designs, making it suitable for legacy system maintenance. Parts from SMC Diode Solutions (ABS8U, DB106S), Comchip Technology (ABS8-HF), Panjit International Inc. (B108S_R2_00001), Taiwan Semiconductor Corporation (DBLS106G, DBLS106GH), and Vishay (DF08S-E3/77, DF08S-E3/I, DF08SA-E3/77) all carry Active status and ROHS3 compliance. The DBLS106GH variant includes AEC-Q101 automotive qualification for applications requiring automotive-grade reliability. Reverse leakage current variations (2 µA to 10 µA at 800V) remain within acceptable operating margins and do not affect functional substitutability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the MDB8S with any of the listed parts without circuit modification?

A: Yes. All listed parts meet the core electrical specifications: 800V peak reverse voltage, 1A average rectified current, 1.1V forward voltage at 1A, and -55°C to 150°C operating temperature range. They are all surface mount 4-SMD gull wing packages and require no circuit changes.

Q: What is the difference between the various packaging formats listed (Cut Tape, Tape & Reel)?

A: Packaging format affects procurement and handling but not electrical performance. Cut Tape (CT) & Digi-Reel® is suitable for lower-volume orders and manual assembly. Tape & Reel (TR) is optimized for high-volume automated pick-and-place assembly. Select based on your production volume and assembly process.

Q: Why do some parts show lower reverse leakage current than the MDB8S?

A: Reverse leakage current variation (2 µA to 10 µA at 800V) reflects manufacturing process differences between suppliers but remains within acceptable operating margins for standard bridge rectifier applications. Lower leakage is not a disadvantage and may provide improved performance in certain low-current applications.

Q: Is the DBLS106GH suitable for automotive applications?

A: The DBLS106GH carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Other parts in this list do not specify automotive qualification and should be evaluated against your specific automotive requirements if applicable.

Q: What does "Not For New Designs" mean for the MDB8S and DF08S1?

A: This status indicates the manufacturer has superseded these parts in their product line. They remain available for existing designs and legacy system support but should not be selected for new development. Active-status alternatives are recommended for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions.

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