DB104-BP Bridge Rectifier Single Phase 400V 1A Equivalent & Substitute Parts

Part Overview

The DB104-BP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 400V peak reverse voltage and 1A average rectified current. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer readily available or when design flexibility permits upgraded 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	Through Hole
Package / Case	4-EDIP (0.321", 8.15mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the DB104-BP is determined by the following critical parameters:

Voltage Rating (Peak Reverse): Substitute parts must meet or exceed 400V. Parts rated below 400V are not suitable for direct replacement.
Current Rating (Average Rectified): Substitute parts must support at least 1A. Parts with higher current ratings provide design margin and are acceptable.
Forward Voltage (Vf): Must not exceed 1.1V at the specified current to maintain circuit performance.
Reverse Leakage Current: Must not exceed 10µA at rated voltage to ensure acceptable leakage characteristics.
Operating Temperature Range: Must encompass -55°C to 150°C to match thermal requirements.
Mounting Type & Package: Through-hole mounting is required; package dimensions must be compatible with PCB layouts designed for 4-EDIP form factors.

Substitute parts are categorized as follows:

Direct Parametric Equivalents (400V, 1A): DB104, DF04, and DF04-G meet all electrical specifications identically to the DB104-BP and are pin-compatible replacements.

Upgraded Alternatives (400V, Higher Current): DF04M and DF204-G provide higher current ratings (1.5A and 2A respectively) while maintaining 400V voltage rating, offering improved thermal margin for the same voltage class.

Lower Voltage Alternative: DF005M operates at 50V and is suitable only for applications where the circuit voltage requirement is 50V or lower; it is not a direct replacement for 400V applications.

Higher Voltage Alternative: DF06M operates at 600V and is suitable for applications requiring higher voltage margin; it is not a direct replacement for 400V-rated circuits but may be used in designs where voltage headroom is beneficial.

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
DB104-BP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Not For New Designs
DB104	SMC Diode Solutions	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active
DF04	SMC Diode Solutions	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active
DF04-G	Comchip Technology	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active
DF04M	onsemi	400 V	1.5 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.300", 7.62mm)	Obsolete
DF204-G	Comchip Technology	400 V	2 A	1.1 V @ 2 A	10 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active
DF005M	Fairchild Semiconductor	50 V	1 A	1.1 V @ 1 A	10 µA @ 50 V	-65°C ~ 150°C	4-EDIP (0.300", 7.62mm)	Active
DF06M	onsemi	600 V	1.5 A	1.1 V @ 1 A	5 µA @ 600 V	-55°C ~ 150°C	4-EDIP (0.300", 7.62mm)	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Electrical Performance):

Select DB104 (SMC Diode Solutions) or DF04 (SMC Diode Solutions) as primary alternatives. Both are Active status components with identical 400V/1A ratings and superior reverse leakage characteristics (5µA vs. 10µA). DF04-G (Comchip Technology) is also Active and provides identical performance with the same leakage specification as the original DB104-BP.

For Upgraded Performance (Higher Current Margin):

DF204-G (Comchip Technology, Active status) provides 2A current rating at 400V in the same package footprint as the DB104-BP, offering increased thermal margin for applications where current headroom is beneficial. DF04M (onsemi, Obsolete status) provides 1.5A at 400V but has a slightly different package dimension (0.300" vs. 0.321") requiring PCB layout verification.

For Voltage-Specific Applications:

DF005M is suitable only for circuits operating at 50V or lower and is not a replacement for 400V applications. DF06M is suitable for applications requiring 600V rating and is not a replacement for 400V-rated circuits.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance. DB104 and DF04 are REACH Affected; DF04-G and DF204-G are REACH Unaffected. Verify REACH compliance requirements for your specific application and supply chain.

Frequently Asked Questions (FAQ)

Q: Can I use DF04M or DF06M as a direct replacement for DB104-BP?

A: DF04M and DF06M are not direct replacements due to package dimension differences (0.300" vs. 0.321"). PCB layout compatibility must be verified before substitution. DF04M operates at 400V with higher current; DF06M operates at 600V. Both are Obsolete status components.

Q: What is the difference between DB104-BP and DB104?

A: Both are 400V/1A single-phase bridge rectifiers with identical electrical specifications. DB104 (SMC Diode Solutions, Active) is the current production equivalent. DB104-BP (Micro Commercial Co, Not For New Designs) is end-of-life. DB104 has lower reverse leakage (5µA vs. 10µA), providing improved performance.

Q: Can I substitute DF005M for DB104-BP?

A: No. DF005M is rated for 50V maximum, while DB104-BP is rated for 400V. Using DF005M in a 400V circuit will result in component failure. DF005M is suitable only for applications with 50V or lower voltage requirements.

Q: Are there any package compatibility issues between DB104-BP and its substitutes?

A: Most substitutes use the same 4-EDIP package form factor (0.321", 8.15mm), ensuring PCB compatibility. DF04M and DF005M use a slightly smaller 4-EDIP package (0.300", 7.62mm). Verify PCB pad spacing and hole diameter before substitution. All parts are through-hole mounted.

Q: Which substitute offers the best long-term availability?

A: DB104 (SMC Diode Solutions), DF04 (SMC Diode Solutions), DF04-G (Comchip Technology), and DF204-G (Comchip Technology) are all Active status components with current production. DF04M and DF06M are Obsolete and should be avoided for new designs or long-term supply planning.

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

A: DB104-BP specifies 10µA reverse leakage at 400V. DB104 and DF04 specify 5µA, indicating lower leakage and potentially better performance in high-impedance circuits. DF04-G matches the original 10µA specification. For most applications, this difference is negligible; verify circuit requirements if leakage is critical.

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