Equivalent & Substitute Parts for DF04S Bridge Rectifier

Part Overview

The DF04S 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. This component is classified as obsolete and does not comply with RoHS standards. Due to its obsolete status, identifying equivalent and substitute parts is necessary for ongoing production support, design updates, and compliance with current environmental regulations. Substitute parts must maintain electrical compatibility while meeting modern manufacturing and environmental standards.

Key Parameters

Parameter	DF04S Value	Unit
Diode Type	Single Phase	—
Technology	Standard	—
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 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	4-SMD, Gull Wing	—
RoHS Status	Non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the DF04S bridge rectifier are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Voltage - Peak Reverse (Max): 400 V
Current - Average Rectified (Io): 1 A (or higher rating acceptable)
Diode Type: Single Phase
Technology: Standard
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing

Secondary Considerations:

Forward voltage (Vf) at rated current
Reverse leakage current
Operating temperature range
RoHS compliance status
Product status (Active preferred over Obsolete or Not For New Designs)

Parts are classified into three categories:

Parametric Equivalents: Identical electrical specifications with improved compliance or availability
Direct Manufacturer Alternatives: Same base part number from different manufacturers or product lines
Functional Substitutes: Higher current ratings or alternative voltage ratings that may serve in specific applications

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) V @ If	Ir (Max) µA @ Vr	Temp Range °C	RoHS Status	Product Status
DF04S	Vishay	400	1	1.1 @ 1 A	5 @ 400 V	-55 to 150	Non-compliant	Obsolete
DF04S-E3/45	Vishay	400	1	1.1 @ 1 A	5 @ 400 V	-55 to 150	ROHS3 Compliant	Active
DF04SA-E3/45	Vishay	400	1	1.1 @ 1 A	5 @ 400 V	-55 to 150	ROHS3 Compliant	Active
DF04S-T	Diodes Incorporated	400	1	1.1 @ 1 A	10 @ 400 V	-65 to 150	ROHS3 Compliant	Active
DB104S-G	Comchip Technology	400	1	1.1 @ 1 A	10 @ 400 V	-55 to 150	ROHS3 Compliant	Obsolete
SDB104-TP	Micro Commercial Co	400	1	1.1 @ 1 A	10 @ 400 V	-55 to 150	ROHS3 Compliant	Not For New Designs
DF1504S-G	Comchip Technology	400	1.5	1.1 @ 1.5 A	10 @ 400 V	-55 to 150	ROHS3 Compliant	Active
DF1504ST-G	Comchip Technology	400	1.5	1.1 @ 1.5 A	10 @ 400 V	-55 to 150	ROHS3 Compliant	Obsolete
DF02S	onsemi	200	1.5	1.1 @ 1.5 A	10 @ 200 V	-55 to 150	ROHS3 Compliant	Not For New Designs

Engineering Selection Recommendations

Primary Recommendation: DF04S-E3/45

The DF04S-E3/45 manufactured by Vishay is the direct parametric equivalent with identical electrical specifications to the DF04S. This part maintains 400 V peak reverse voltage and 1 A average rectified current ratings. The DF04S-E3/45 is ROHS3 compliant and carries Active product status, making it suitable for new designs and ongoing production. Inventory availability is 5,400 pieces.

Secondary Recommendation: DF04S-T

The DF04S-T from Diodes Incorporated provides equivalent electrical performance with extended operating temperature range (-65°C to 150°C versus -55°C to 150°C). This part is ROHS3 compliant with Active status and offers the highest inventory availability at 104,400 pieces. The reverse leakage current specification is 10 µA at 400 V, compared to 5 µA for the original DF04S, which remains within acceptable operating parameters for standard bridge rectifier applications.

Higher Current Alternative: DF1504S-G

For applications requiring increased current capacity, the DF1504S-G from Comchip Technology provides 1.5 A average rectified current while maintaining 400 V peak reverse voltage. This part is ROHS3 compliant with Active status. Use this substitute only when circuit design permits the higher current rating and when the 4-SMD, Gull Wing package is compatible with board layout.

Compliance Consideration:

All recommended substitutes are ROHS3 compliant, addressing the non-compliance status of the original DF04S. Parts marked as Obsolete or Not For New Designs should be avoided for new product development, though they may serve as interim solutions for legacy system support.

Frequently Asked Questions (FAQ)

Q1: Can DF04S-E3/45 be used as a direct replacement for DF04S?

Yes. The DF04S-E3/45 maintains identical electrical specifications: 400 V peak reverse voltage, 1 A average rectified current, 1.1 V forward voltage at 1 A, and -55°C to 150°C operating temperature range. The primary difference is ROHS3 compliance and Active product status. Both parts use the same 4-SMD, Gull Wing package.

Q2: What is the difference between DF04S-T and DF04S-E3/45?

Both parts meet the electrical requirements of the DF04S. The DF04S-T from Diodes Incorporated extends the lower operating temperature limit to -65°C (versus -55°C) and specifies 10 µA reverse leakage current at 400 V (versus 5 µA for DF04S-E3/45). The DF04S-T offers significantly higher inventory availability. Selection depends on temperature range requirements and leakage current specifications for the application.

Q3: When should DF1504S-G be used instead of DF04S-E3/45?

The DF1504S-G is suitable when the circuit design requires 1.5 A average rectified current capacity. Both parts maintain 400 V peak reverse voltage and use identical packaging. Do not use DF1504S-G as a substitute unless the application specifically requires the higher current rating, as it represents a design change rather than a direct replacement.

Q4: Why is DF02S listed as a substitute if it has different voltage and current ratings?

The DF02S from onsemi is included for reference only. It operates at 200 V peak reverse voltage with 1.5 A current capacity, making it unsuitable as a direct replacement for the 400 V, 1 A DF04S. This part should be used only in applications with lower voltage requirements.

Q5: Are all substitute parts available in the same packaging?

Yes. All recommended substitutes use 4-SMD, Gull Wing surface mount packaging, ensuring mechanical compatibility with existing PCB layouts designed for the DF04S. Packaging variations exist only in supplier delivery format (Tube, Cut Tape, or Tape & Reel), which does not affect component functionality.

Q6: What is the significance of RoHS compliance for bridge rectifier selection?

RoHS3 compliance indicates the part meets current environmental regulations restricting hazardous substances. The original DF04S is RoHS non-compliant. All active substitutes listed are ROHS3 compliant, making them suitable for products subject to environmental regulations and customer requirements for lead-free components.

Q7: Should obsolete parts be used in new designs?

No. Parts with Obsolete or Not For New Designs status should not be selected for new product development. Use Active status parts such as DF04S-E3/45 or DF04S-T. Obsolete parts may be used only for legacy system maintenance when no alternative exists.

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