DB104S Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DB104S is a single-phase bridge rectifier manufactured by SMC Diode Solutions, rated for 400 V peak reverse voltage and 1 A average rectified current. This component is actively produced and widely used in power supply and rectification applications requiring surface mount packaging in the DB-S configuration.

Substitute parts become necessary when the DB104S reaches end-of-life status, when alternative sourcing is required due to supply constraints, or when design requirements call for equivalent performance with different package designations or manufacturer certifications such as automotive qualification.

Key Parameters

Parameter	Value
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
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 DB104S is determined by strict adherence to the following electrical and mechanical parameters:

Voltage - Peak Reverse (Max): 400 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
Diode Type: Single Phase
Technology: Standard

All substitute parts listed meet these core electrical specifications. Variations in reverse leakage current, product status, and manufacturer certifications are noted but do not disqualify substitution based on functional equivalence. Package designations (DB-S, DBLS, DFS, 4-SDIP, SDB-1) differ by manufacturer but maintain mechanical and electrical compatibility within the 4-SMD, Gull Wing form factor.

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
DB104S	SMC Diode Solutions	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
DBLS104G	Taiwan Semiconductor Corporation	400 V	1 A	1.1 V @ 1 A	2 µA @ 400 V	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
DBLS104GH	Taiwan Semiconductor Corporation	400 V	1 A	1.1 V @ 1 A	2 µA @ 400 V	-55°C ~ 150°C (TJ)	Active	ROHS3 Compliant
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 (TJ)	Active	ROHS3 Compliant
DF04S1	onsemi	400 V	1 A	1.1 V @ 1 A	3 µA @ 400 V	-55°C ~ 150°C (TJ)	Not For New Designs	ROHS3 Compliant
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 (TJ)	Active	ROHS3 Compliant
DF04ST-G	Comchip Technology	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C (TJ)	Obsolete	ROHS3 Compliant
SDB104-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C (TJ)	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and active production, select from parts with Active product status: DBLS104G, DBLS104GH, DF04S-E3/77, or DF04SA-E3/77. These parts ensure long-term availability and manufacturer support.

DBLS104GH is qualified to AEC-Q101 automotive standards and carries the automotive grade designation, making it suitable for applications requiring automotive-level reliability and traceability.

DF04S-E3/77 and DF04SA-E3/77 from Vishay offer the highest inventory availability (38,100 and 2,216 units respectively) and are recommended when supply chain continuity is a primary concern.

Parts marked "Not For New Designs" (DF04S1, SDB104-TP) and "Obsolete" (DF04ST-G) are suitable only for legacy system maintenance or repair applications where the original part number must be maintained. These parts should not be selected for new product development.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can I substitute DB104S with DBLS104G or DBLS104GH?

A: Yes. Both DBLS parts meet all core electrical parameters: 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. Both are surface mount 4-SMD Gull Wing packages. DBLS104GH includes AEC-Q101 automotive qualification if that certification is required.

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

A: Both parts are manufactured by Vishay and meet identical electrical specifications. The primary difference is inventory availability: DF04S-E3/77 has 38,100 units in stock compared to 2,216 units for DF04SA-E3/77. Both are Active status parts suitable for new designs.

Q: Why are DF04S1 and SDB104-TP marked "Not For New Designs"?

A: These parts are in end-of-life status and manufacturers no longer recommend them for new product development. They remain available for legacy system support and repair. New designs should use Active status alternatives such as DBLS104G, DBLS104GH, DF04S-E3/77, or DF04SA-E3/77.

Q: Are all substitute parts in the same physical package?

A: All substitute parts use 4-SMD Gull Wing surface mount packaging and are mechanically compatible. Manufacturer-specific package designations (DB-S, DBLS, DFS, 4-SDIP, SDB-1) reflect different supplier conventions but do not affect PCB footprint compatibility.

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

A: Reverse leakage current varies among substitutes (2 µA to 10 µA at 400 V) but all values remain within acceptable ranges for standard rectifier applications. The DB104S and most active alternatives specify 5 µA. Higher leakage values (DF04ST-G, SDB104-TP at 10 µA) do not disqualify substitution for typical power supply applications but may be relevant in high-impedance or precision measurement circuits.

Q: Is DBLS104GH recommended for automotive applications?

A: DBLS104GH carries AEC-Q101 qualification and automotive grade designation, making it the appropriate choice for automotive applications requiring documented reliability standards and traceability. Standard industrial-grade alternatives do not carry this certification.

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