SDB104-TP Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The SDB104-TP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 400 V peak reverse voltage and 1 A average rectified current. This surface mount component in 4-SMD Gull Wing package is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing production support, maintenance applications, and design transitions to active alternatives.

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	10 µA @ 400 V
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 for the SDB104-TP is determined by matching the following critical electrical and mechanical parameters:

Voltage Rating: Peak reverse voltage must be 400 V or higher
Current Rating: Average rectified current must be 1 A or higher
Forward Voltage: Maximum forward voltage drop at rated current must not exceed 1.1 V
Reverse Leakage: Maximum reverse leakage current at rated voltage must not exceed 10 µA
Package: 4-SMD Gull Wing surface mount configuration
Temperature Range: Operating range must cover -55°C to 150°C minimum
Compliance: RoHS3 compliance preferred for new applications

Substitute parts are categorized as:

Direct Equivalents – Identical electrical specifications and package, differing only in manufacturer or packaging format.

Upgrade Alternatives – Enhanced specifications (wider temperature range, active product status) with identical or superior electrical performance.

Similar Alternatives – Different voltage or current ratings that may suit specific application requirements while maintaining package compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage (V)	Current (A)	Vf @ If (V)	Reverse Leakage (µA)	Temp Range (°C)	Product Status	RoHS	Packaging
SDB104-TP	Micro Commercial Co	400	1	1.1 @ 1 A	10 @ 400 V	-55 ~ 150	Not For New Designs	ROHS3	Tape & Reel
DF04S-G	Comchip Technology	400	1	1.1 @ 1 A	10 @ 400 V	-55 ~ 150	Obsolete	ROHS3	Tube
DF04S-T	Diodes Incorporated	400	1	1.1 @ 1 A	10 @ 400 V	-65 ~ 150	Active	ROHS3	Cut Tape & Digi-Reel
DF04S	Vishay General Semiconductor	400	1	1.1 @ 1 A	5 @ 400 V	-55 ~ 150	Obsolete	RoHS Non-compliant	Tube
DF005S	onsemi	50	1.5	1.1 @ 1 A	5 @ 50 V	-55 ~ 150	Not For New Designs	ROHS3	Cut Tape & Digi-Reel
DF01S	onsemi	100	1.5	1.1 @ 1.5 A	5 @ 100 V	-55 ~ 150	Not For New Designs	ROHS3	Cut Tape & Digi-Reel
DF02S	onsemi	200	1.5	1.1 @ 1.5 A	10 @ 200 V	-55 ~ 150	Not For New Designs	ROHS3	Cut Tape & Digi-Reel
DF06S	Fairchild Semiconductor	600	1	1.1 @ 1 A	10 @ 600 V	-65 ~ 150	Active	Not Specified	Not Specified
DF08S	onsemi	800	1.5	1.1 @ 1 A	10 @ 800 V	-55 ~ 150	Not For New Designs	ROHS3	Cut Tape & Digi-Reel
DF10S	Good-Ark Semiconductor	1000	1	1.1 @ 500 mA	5 @ 1000 V	-55 ~ 150	Active	ROHS3	Tape & Reel
DF1504S	Diodes Incorporated	400	1.5	1.1 @ 1.5 A	10 @ 400 V	-65 ~ 150	Active	ROHS3	Bulk

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

DF04S-T (Diodes Incorporated) is the primary recommended substitute. It maintains 400 V / 1 A specifications with identical forward voltage and reverse leakage characteristics. The part is Active status with extended temperature range (-65°C to 150°C) and ROHS3 compliance. Packaging is available in Cut Tape and Digi-Reel formats with high inventory availability (104,400 pcs).

For Enhanced Performance:

DF1504S (Diodes Incorporated) provides upgraded specifications with 1.5 A current rating at the same 400 V voltage, maintaining identical forward voltage characteristics. Active product status and ROHS3 compliance make it suitable for new designs. Extended temperature range (-65°C to 150°C) provides additional operational margin.

For Higher Voltage Applications:

DF06S (Fairchild Semiconductor) and DF10S (Good-Ark Semiconductor) offer higher voltage ratings (600 V and 1000 V respectively) while maintaining 1 A current capability. Both are Active status products. These are suitable when circuit requirements exceed 400 V specifications.

Avoid:

DF04S (Vishay) is RoHS non-compliant and Obsolete status. DF04S-G (Comchip Technology) is Obsolete. Parts rated below 400 V (DF005S, DF01S, DF02S) are unsuitable for 400 V applications and should not be used as direct replacements.

Frequently Asked Questions (FAQ)

Q: Can DF04S-T directly replace SDB104-TP in existing designs?

A: Yes. DF04S-T matches all critical electrical parameters (400 V, 1 A, 1.1 V forward voltage, 10 µA reverse leakage) and uses identical 4-SMD Gull Wing packaging. The extended temperature range (-65°C vs -55°C minimum) provides additional operational margin. Packaging format differs (Cut Tape & Digi-Reel vs Tape & Reel), but component specifications are functionally equivalent.

Q: What is the difference between DF04S-T and DF1504S?

A: DF1504S has a higher current rating (1.5 A vs 1 A) at the same 400 V voltage. Both maintain 1.1 V maximum forward voltage and 10 µA reverse leakage. DF1504S is suitable for applications requiring higher current capacity while maintaining the same voltage specification. Both are Active status with ROHS3 compliance.

Q: Can lower voltage parts like DF005S or DF01S be used instead of SDB104-TP?

A: No. DF005S (50 V) and DF01S (100 V) have insufficient voltage ratings for 400 V applications. Using undersized voltage-rated components will result in component failure. Voltage rating must equal or exceed 400 V.

Q: Why is DF04S (Vishay) not recommended?

A: DF04S is RoHS non-compliant and classified as Obsolete. While electrical specifications match, regulatory compliance and product availability make it unsuitable for new applications or ongoing production support.

Q: Are there packaging considerations when substituting?

A: Yes. SDB104-TP uses Tape & Reel packaging. DF04S-T is available in Cut Tape and Digi-Reel formats. Both are surface mount compatible with identical 4-SMD Gull Wing footprints. Verify packaging format availability with your supplier for production requirements.

Q: What is the temperature range difference between SDB104-TP and DF04S-T?

A: SDB104-TP operates -55°C to 150°C. DF04S-T operates -65°C to 150°C. The extended lower temperature limit in DF04S-T provides additional operational margin for cold environment applications without affecting performance in standard temperature ranges.

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