DF08ST-HF Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF08ST-HF is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 800 V peak reverse voltage and 1 A average rectified current. This component is classified as Obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The DF08ST-HF operates across a temperature range of -55°C to 150°C and is packaged in a 4-SMD Gull Wing surface mount configuration (DFS package).

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
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DF08ST-HF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

Secondary Compatibility Considerations:

Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A (maximum allowable)
Current - Reverse Leakage @ Vr: Specified at 10 µA @ 800 V for the main part; substitute parts may exhibit lower leakage current without affecting compatibility

Substitute parts are grouped into two categories: the MFR Recommended substitute (DF08S-HF) and Parametric Equivalents. All listed substitutes meet or exceed the electrical and mechanical specifications of the DF08ST-HF while maintaining identical package geometry and mounting characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status	RoHS Status
DF08ST-HF	Comchip Technology	800 V	1 A	1.1 V @ 1 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Obsolete	Not Specified
DF08S-HF	Comchip Technology	800 V	1 A	1.1 V @ 1 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active	Not Specified
ABS8-HF	Comchip Technology	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active	ROHS3 Compliant
ABS8U	SMC Diode Solutions	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	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	4-SMD, Gull Wing	Active	ROHS3 Compliant
DB106S	SMC Diode Solutions	800 V	1 A	1.1 V @ 1 A	5 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active	ROHS3 Compliant
DBLS106G	Taiwan Semiconductor Corporation	800 V	1 A	1.1 V @ 1 A	2 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active	ROHS3 Compliant
DBLS106GH	Taiwan Semiconductor Corporation	800 V	1 A	1.1 V @ 1 A	2 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	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	4-SMD, Gull Wing	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	4-SMD, Gull Wing	Active	Not Specified
DF08S1	onsemi	800 V	1 A	1.1 V @ 1 A	3 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: DF08S-HF

The DF08S-HF is the MFR Recommended substitute and is manufactured by Comchip Technology, the original manufacturer of the DF08ST-HF. This part maintains identical electrical specifications and package configuration while offering Active product status. Selection of DF08S-HF ensures design continuity with minimal qualification effort.

Secondary Recommendations: Active Status Parametric Equivalents

The following parts are classified as Active and provide parametric equivalence with improved or equivalent reverse leakage characteristics:

ABS8-HF (Comchip Technology): Active status, ROHS3 Compliant, reduced reverse leakage (5 µA @ 800 V)
ABS8U (SMC Diode Solutions): Active status, ROHS3 Compliant, REACH Affected designation, reduced reverse leakage (5 µA @ 800 V)
B108S_R2_00001 (Panjit International Inc.): Active status, ROHS3 Compliant, REACH Unaffected, reduced reverse leakage (5 µA @ 800 V)
DB106S (SMC Diode Solutions): Active status, ROHS3 Compliant, REACH Affected designation, reduced reverse leakage (5 µA @ 800 V), highest inventory availability (33,300 pcs)
DBLS106G (Taiwan Semiconductor Corporation): Active status, ROHS3 Compliant, REACH Unaffected, superior reverse leakage performance (2 µA @ 800 V)
DBLS106GH (Taiwan Semiconductor Corporation): Active status, ROHS3 Compliant, REACH Unaffected, AEC-Q101 Automotive qualification, superior reverse leakage performance (2 µA @ 800 V)
DF08S-E3/77 (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 Compliant, REACH Unaffected, reduced reverse leakage (5 µA @ 800 V), high inventory availability (10,300 pcs)
DF08S-E3/I (Vishay General Semiconductor - Diodes Division): Active status, REACH Unaffected, reduced reverse leakage (5 µA @ 800 V)

Not Recommended for New Designs: DF08S1

The DF08S1 (onsemi) is classified as Not For New Designs and should not be selected for new circuit implementations, despite meeting electrical and mechanical specifications.

Compliance Considerations

All recommended substitutes are ROHS3 Compliant. For applications requiring REACH Unaffected status, select from: B108S_R2_00001, DBLS106G, DBLS106GH, DF08S-E3/77, or DF08S-E3/I.

For automotive applications requiring AEC-Q101 qualification, DBLS106GH is the designated option.

Frequently Asked Questions (FAQ)

Q: Can DF08S-HF directly replace DF08ST-HF in existing designs?

A: Yes. The DF08S-HF is the MFR Recommended substitute and maintains identical electrical specifications (800 V peak reverse voltage, 1 A average rectified current, 1.1 V forward voltage @ 1 A) and package configuration (4-SMD Gull Wing). The primary difference is product status: DF08ST-HF is Obsolete while DF08S-HF is Active.

Q: What is the significance of reverse leakage current differences among substitute parts?

A: All substitute parts specify reverse leakage current at 10 µA @ 800 V or lower. The DF08ST-HF specifies 10 µA @ 800 V. Substitute parts with lower reverse leakage (5 µA, 3 µA, or 2 µA @ 800 V) provide equivalent or superior performance and do not require circuit redesign. Lower reverse leakage reduces power dissipation and improves circuit efficiency.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All listed substitute parts are packaged in 4-SMD Gull Wing surface mount configuration, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the DF08ST-HF.

Q: Which substitute part offers the best availability?

A: DB106S (SMC Diode Solutions) offers the highest inventory availability at 33,300 pcs. DF08S-E3/77 (Vishay General Semiconductor - Diodes Division) provides the second-highest availability at 10,300 pcs.

Q: What is the difference between DBLS106G and DBLS106GH?

A: Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications and reverse leakage performance (2 µA @ 800 V). The primary distinction is that DBLS106GH carries AEC-Q101 Automotive qualification and is designated as Grade: Automotive, making it suitable for automotive applications requiring formal qualification documentation.

Q: Are there packaging format differences among substitute parts?

A: Packaging formats vary among substitutes. DF08ST-HF does not specify packaging format. Substitute parts are available in the following formats: Cut Tape (CT) & Digi-Reel® (DF08S-E3/77), Tape & Reel (TR) (ABS8U, B108S_R2_00001, DBLS106G, DBLS106GH, DF08S-E3/I, DF08S1), or unspecified format (DF08S-HF, ABS8-HF, DB106S). Verify packaging format compatibility with procurement and assembly processes.

Q: Which substitute parts are ROHS3 Compliant?

A: All substitute parts except DF08S-E3/I are explicitly designated as ROHS3 Compliant. DF08S-E3/I does not specify RoHS status in the provided data.

Q: Can substitute parts be used interchangeably in the same circuit?

A: Yes. All substitute parts meet or exceed the electrical specifications of the DF08ST-HF across the mandatory matching parameters: 800 V peak reverse voltage, 1 A average rectified current, 1.1 V maximum forward voltage @ 1 A, -55°C to 150°C operating temperature range, and 4-SMD Gull Wing package configuration. Interchangeability is confirmed at the electrical and mechanical level.

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