DF08S Bridge Rectifier Diode - Equivalent & Substitute Parts

Part Overview

The DF08S is a single-phase bridge rectifier diode manufactured by onsemi, rated for 800 V peak reverse voltage and 1.5 A average rectified current in a 4-SDIP surface mount package. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the DF08S specifications remain functionally required.

Key Parameters

Parameter	Value
Diode Type	Single Phase Bridge Rectifier
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Operating Temperature Range	-55°C to 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Supplier Device Package	4-SDIP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DF08S is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must be equal to or greater than 800 V to maintain voltage withstand capability
Current - Average Rectified (Io): Must be equal to or greater than 1.5 A to support the same load current
Package / Case: Must be 4-SMD, Gull Wing to ensure mechanical and electrical compatibility with existing PCB layouts
Mounting Type: Must be Surface Mount to match assembly process requirements
Diode Type: Must be Single Phase Bridge Rectifier to maintain functional equivalence

Parts are grouped into three categories:

Direct Equivalents: Identical voltage and current ratings with matching package specifications
Higher-Rated Substitutes: Equal or higher voltage and current ratings, same package, suitable for direct replacement
Lower-Rated Alternatives: Lower voltage or current ratings; substitution only valid if application requirements permit downrating

Parameter Comparison

Part Number	Manufacturer	Voltage (V)	Current (A)	Vf @ If	Reverse Leakage	Package	Status	RoHS
DF08S	onsemi	800	1.5	1.1 V @ 1 A	10 µA @ 800 V	4-SDIP	Not For New Designs	ROHS3
DF08S-T	Diodes Incorporated	800	1.0	1.1 V @ 1 A	10 µA @ 800 V	DF-S	Active	ROHS3
DF10S	Good-Ark Semiconductor	1000	1.0	1.1 V @ 500 mA	5 µA @ 1000 V	DFS	Active	ROHS3
DF06S	Fairchild Semiconductor	600	1.0	1.1 V @ 1 A	10 µA @ 600 V	DF-S	Active	Not Specified
DF04S	Vishay General Semiconductor	400	1.0	1.1 V @ 1 A	5 µA @ 400 V	DFS	Obsolete	Non-compliant
DF01S	onsemi	100	1.5	1.1 V @ 1.5 A	5 µA @ 100 V	4-SDIP	Not For New Designs	ROHS3
DF005S	onsemi	50	1.5	1.1 V @ 1 A	5 µA @ 50 V	4-SDIP	Not For New Designs	ROHS3
SDB105-TP	Micro Commercial Co	600	1.0	1.1 V @ 1 A	10 µA @ 600 V	SDB-1	Active	ROHS3
SDB104-TP	Micro Commercial Co	400	1.0	1.1 V @ 1 A	10 µA @ 400 V	SDB-1	Not For New Designs	ROHS3
SDB103-TP	Micro Commercial Co	200	1.0	1.1 V @ 1 A	10 µA @ 200 V	SDB-1	Not For New Designs	ROHS3

Engineering Selection Recommendations

Direct Replacement (Preferred for Legacy Support)

DF08S-T (Diodes Incorporated) is the closest active equivalent. It maintains 800 V peak reverse voltage and identical forward voltage characteristics. The current rating is reduced to 1.0 A, which is acceptable only if the application circuit operates below 1.5 A. This part carries Active product status and ROHS3 compliance, making it suitable for ongoing procurement.

Higher Voltage Rated Substitute

DF10S (Good-Ark Semiconductor) provides 1000 V peak reverse voltage with 1.0 A current rating. This part is Active and ROHS3 compliant. Substitution is valid for applications where the 800 V specification is a design margin rather than a hard requirement, and where 1.0 A current capacity is sufficient.

Lower Voltage Rated Alternatives

SDB105-TP (Micro Commercial Co) at 600 V and DF06S (Fairchild Semiconductor) at 600 V are suitable only if the application circuit operates at or below 600 V peak reverse voltage. Both are Active status parts with ROHS3 compliance (SDB105-TP confirmed; DF06S compliance not specified). These represent downrating and require circuit analysis to confirm compatibility.

Parts Not Recommended for Substitution

DF005S and DF01S are significantly underrated at 50 V and 100 V respectively and are unsuitable for 800 V applications. DF04S is Obsolete and RoHS non-compliant. SDB103-TP and SDB104-TP are underrated and carry "Not For New Designs" status.

Frequently Asked Questions (FAQ)

Q: Can DF08S-T replace DF08S directly on the PCB?

A: DF08S-T has a different package designation (DF-S vs. 4-SDIP). Physical footprint compatibility must be verified against the PCB layout. Both are 4-SMD, Gull Wing packages, but supplier device package differences may indicate subtle dimensional variations. Consult manufacturer datasheets for pin-to-pin compatibility.

Q: What is the minimum voltage rating required for a substitute?

A: The substitute must have a peak reverse voltage rating equal to or greater than 800 V. Using a lower-rated part (such as 600 V or 400 V) introduces risk of diode failure under transient overvoltage conditions and is not recommended without circuit redesign and analysis.

Q: Can I use DF10S (1000 V, 1.0 A) instead of DF08S (800 V, 1.5 A)?

A: DF10S provides higher voltage margin, which is beneficial. However, the current rating is reduced from 1.5 A to 1.0 A. Substitution is valid only if the application circuit draws 1.0 A or less. If the circuit requires 1.5 A, DF10S will be inadequate.

Q: Are all substitute parts RoHS compliant?

A: Most listed substitutes are ROHS3 compliant. DF04S is explicitly RoHS non-compliant and should not be used in applications requiring RoHS certification. DF06S compliance status is not specified in the provided data.

Q: What is the difference between 4-SDIP and DF-S packages?

A: Both are 4-SMD, Gull Wing surface mount packages. The designations refer to supplier device package naming conventions. Physical compatibility depends on exact pin spacing and body dimensions, which must be verified against manufacturer datasheets before substitution.

Q: Why is DF08S marked "Not For New Designs"?

A: This status indicates the part has reached end-of-life and is no longer recommended for new product development. However, it remains available for legacy system support and repair. Active-status alternatives such as DF08S-T or DF10S are preferred for new applications.

Q: Can lower-rated parts like SDB105-TP (600 V) be used in an 800 V application?

A: No. Using a 600 V part in an 800 V circuit creates a 200 V overvoltage margin deficit. The diode will fail under normal operating conditions or transient spikes. Substitution with lower-rated parts is only valid if the application circuit has been redesigned to operate at the lower voltage level.

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