DF04S/77 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF04S/77 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V peak reverse voltage and 1 A average rectified current in a 4-SMD, Gull Wing surface mount package. The part is currently obsolete, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Type: Single Phase
Voltage - Peak Reverse (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: 4-SMD, Gull Wing
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Grouping Logic:

Parametric Equivalents maintain identical electrical specifications (400 V, 1 A) with matching forward voltage and reverse leakage characteristics. These parts are direct functional replacements with no derating required.

Direct Substitutes meet or exceed the primary electrical specifications while maintaining package compatibility. Parts with higher current ratings (1.5 A) or equivalent voltage ratings are included as they operate within the same thermal and electrical envelope.

Manufacturer Recommended Substitutes are designated by original equipment manufacturers as approved alternatives, ensuring design validation and supply chain continuity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Product Status	RoHS Status	Packaging
DF04S/77	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Obsolete	RoHS non-compliant	Tape & Reel (TR)
DF04S-E3/77	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Active	ROHS3 Compliant	Tape & Reel (TR)
DF04SA-E3/77	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Active	ROHS3 Compliant	Tape & Reel (TR)
DF04S-T	Diodes Incorporated	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-65°C ~ 150°C	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DF1504S-G	Comchip Technology	400 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 400 V	-55°C ~ 150°C	Active	ROHS3 Compliant	Tube
DF1504ST-G	Comchip Technology	400 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 400 V	-55°C ~ 150°C	Obsolete	ROHS3 Compliant	Tube
ABS4-HF	Comchip Technology	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Active	ROHS3 Compliant	Surface Mount
ABS4U	SMC Diode Solutions	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Active	ROHS3 Compliant	Tape & Reel (TR)
DF02S	onsemi	200 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 200 V	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
DF04S	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	Obsolete	RoHS non-compliant	Tube

Engineering Selection Recommendations

For New Designs (Recommended Primary Substitutes):

DF04S-E3/77 and DF04SA-E3/77 are the preferred replacements for the obsolete DF04S/77. Both are manufactured by Vishay General Semiconductor - Diodes Division, maintaining original design validation and supply chain continuity. These parts are ROHS3 compliant, active in production, and provide identical electrical specifications with matching forward voltage and reverse leakage characteristics. Packaging in Tape & Reel (TR) format supports automated assembly processes.

Alternative Active Substitutes:

DF04S-T (Diodes Incorporated) is an active, ROHS3-compliant alternative with identical voltage and current ratings. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin. Reverse leakage is slightly elevated (10 µA vs. 5 µA) but remains within acceptable limits for standard rectification applications.

ABS4U (SMC Diode Solutions) and ABS4-HF (Comchip Technology) are parametric equivalents with identical electrical specifications and ROHS3 compliance. Both are active in production and suitable for direct substitution where package format compatibility is confirmed.

Higher Current Alternatives:

DF1504S-G (Comchip Technology) provides 1.5 A average rectified current at 400 V, offering increased current capacity while maintaining identical forward voltage characteristics. This part is suitable for applications requiring design margin or future current expansion. ROHS3 compliance and active production status support long-term availability.

Not Recommended for New Designs:

DF02S (onsemi) is designated "Not For New Designs" and features reduced peak reverse voltage (200 V), making it unsuitable for 400 V applications. DF1504ST-G is obsolete and should not be selected for new production. All obsolete parts (DF04S/77, DF04S, DF1504ST-G) should be replaced with active alternatives.

Frequently Asked Questions (FAQ)

Q: Can DF04S-E3/77 be used as a direct replacement for DF04S/77?

A: Yes. DF04S-E3/77 is a parametric equivalent with identical electrical specifications (400 V, 1 A, 1.1 V forward voltage, 5 µA reverse leakage) and matching operating temperature range. The primary difference is ROHS3 compliance and active production status. Both use 4-SMD, Gull Wing surface mount packaging.

Q: What is the difference between DF04S-E3/77 and DF04SA-E3/77?

A: Both parts are parametric equivalents with identical electrical and thermal specifications. The designation difference reflects manufacturing process variations within Vishay's product line. Both are ROHS3 compliant and active in production. Selection between them is based on supplier availability and packaging preferences.

Q: Can DF1504S-G replace DF04S/77 in existing designs?

A: DF1504S-G meets the voltage requirement (400 V) and exceeds the current requirement (1.5 A vs. 1 A). Electrical characteristics are compatible. However, packaging differs (Tube vs. Tape & Reel), requiring verification of assembly equipment compatibility. The higher current rating provides design margin but does not affect circuit operation at 1 A load.

Q: Why is DF02S not recommended as a substitute?

A: DF02S has a maximum peak reverse voltage of 200 V, which is insufficient for 400 V applications. Using this part would result in component failure and circuit malfunction. It is not a valid substitute regardless of current rating.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For new designs and production in regulated markets, ROHS3-compliant parts (DF04S-E3/77, DF04SA-E3/77, DF04S-T, DF1504S-G, ABS4U, ABS4-HF) are required. The original DF04S/77 is RoHS non-compliant and unsuitable for new production.

Q: Are there packaging format differences between substitutes?

A: Yes. DF04S-E3/77 and DF04SA-E3/77 use Tape & Reel (TR) format. DF04S-T uses Cut Tape (CT) & Digi-Reel®. DF1504S-G and DF1504ST-G use Tube format. ABS4U uses Tape & Reel (TR). Verify packaging compatibility with assembly equipment before selection. All maintain 4-SMD, Gull Wing surface mount configuration.

Q: What is the operating temperature range difference between DF04S-T and other substitutes?

A: DF04S-T operates from -65°C to 150°C, while most other substitutes operate from -55°C to 150°C. The extended lower temperature limit provides additional thermal margin for applications in extreme cold environments. For standard industrial applications (-55°C to 150°C), this difference is not significant.

Q: Can multiple substitute parts be used interchangeably in production?

A: Yes, provided all selected parts meet the minimum electrical specifications (400 V, 1 A, 1.1 V forward voltage) and packaging requirements (4-SMD, Gull Wing surface mount). Recommended practice is to qualify all substitutes through design validation before production implementation to ensure consistent performance across supply sources.

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