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

Part Overview

The DB104 is a single-phase bridge rectifier diode rated for 400V peak reverse voltage and 1A average rectified current in a through-hole 4-EDIP package. The original Micro Commercial Co version is obsolete, necessitating equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance variations.

Key Parameters

Parameter	Value	Unit
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 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	4-EDIP (0.321", 8.15mm)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Direct Substitutes maintain identical electrical specifications (400V, 1A) and compatible package dimensions. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgrade Substitutes exceed the original specifications in current rating (1.5A or higher) while maintaining or exceeding voltage rating. These provide enhanced performance margin and are suitable for applications where increased current capacity is acceptable.

Parametric Equivalents match core electrical parameters (400V, 1A) but may originate from different manufacturers or have minor package variations. These require physical verification of board fit and pin alignment.

Similar Parts share the same diode type and mounting method but differ in voltage or current ratings. These are suitable only when the application can tolerate the specified parameter deviation.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) V @ If	Ir (Max) µA @ Vr	Tj (°C)	Package	Status	RoHS
DB104	Micro Commercial Co	400	1	1.1 @ 1A	10 @ 400V	-55 to 150	4-EDIP (0.321")	Obsolete	Non-compliant
DB104-BP	Micro Commercial Co	400	1	1.1 @ 1A	10 @ 400V	-55 to 150	4-EDIP (0.321")	Not For New Designs	ROHS3 Compliant
DF04M	onsemi	400	1.5	1.1 @ 1A	5 @ 400V	-55 to 150	4-EDIP (0.300")	Obsolete	ROHS3 Compliant
DF04	SMC Diode Solutions	400	1	1.1 @ 1A	5 @ 400V	-55 to 150	4-EDIP (0.321")	Active	ROHS3 Compliant
DF04-G	Comchip Technology	400	1	1.1 @ 1A	10 @ 400V	-55 to 150	4-EDIP (0.321")	Active	ROHS3 Compliant
DB104 (SMC)	SMC Diode Solutions	400	1	1.1 @ 1A	5 @ 400V	-55 to 150	4-EDIP (0.321")	Active	ROHS3 Compliant
DF06M	onsemi	600	1.5	1.1 @ 1A	5 @ 600V	-55 to 150	4-EDIP (0.300")	Obsolete	ROHS3 Compliant
DF204-G	Comchip Technology	400	2	1.1 @ 2A	10 @ 400V	-55 to 150	4-EDIP (0.321")	Active	ROHS3 Compliant
DF005M	Fairchild Semiconductor	50	1	1.1 @ 1A	10 @ 50V	-65 to 150	4-EDIP (0.300")	Active	Not specified

Engineering Selection Recommendations

Preferred Direct Substitutes (Pin-Compatible, No Circuit Modification Required):

DF04 (SMC Diode Solutions) and DF04-G (Comchip Technology) are the primary alternatives. Both maintain 400V/1A specifications with identical package dimensions (0.321" 4-EDIP). DF04 is active production status with ROHS3 compliance. DF04-G is also active with ROHS3 compliance. Both feature reduced reverse leakage (5 µA vs. 10 µA), improving reliability.

DB104 (SMC Diode Solutions) provides an exact parametric match with active production status and ROHS3 compliance, suitable for direct replacement in new designs.

Upgrade Substitutes (Enhanced Current Rating):

DF04M (onsemi) provides 1.5A current capacity at 400V with reduced reverse leakage (5 µA). Package dimension is 0.300" (7.62mm), requiring physical board verification. Suitable for applications requiring increased current margin.

DF204-G (Comchip Technology) provides 2A current capacity at 400V with identical package dimensions (0.321"). Active production status with ROHS3 compliance. Suitable for applications with higher current requirements.

Not Recommended for Direct Substitution:

DF005M (Fairchild Semiconductor) operates at 50V maximum, insufficient for 400V applications.

DF06M (onsemi) operates at 600V, exceeding application requirements and introducing unnecessary cost.

DB104-BP (Micro Commercial Co) is marked "Not For New Designs" and should be avoided in new production.

Frequently Asked Questions (FAQ)

Q: Can DF04M replace DB104 directly on the PCB?

A: DF04M maintains electrical compatibility (400V, 1.5A) but has a different package dimension (0.300" vs. 0.321"). Physical board fit must be verified before installation. Pin configuration remains compatible.

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

A: Both are identical electrically (400V, 1A). DB104-BP is tube-packaged and marked "Not For New Designs," while the original DB104 is obsolete. For new applications, use DF04, DF04-G, or DB104 (SMC Diode Solutions).

Q: Is DF04-G a suitable replacement for DB104?

A: Yes. DF04-G matches all critical parameters (400V, 1A, -55 to 150°C) with identical package dimensions (0.321" 4-EDIP). It is active production status with ROHS3 compliance.

Q: Can I use DF204-G instead of DB104?

A: DF204-G is electrically compatible with identical package dimensions but provides 2A current capacity instead of 1A. It is suitable if the application can tolerate higher current rating. No circuit modification is required.

Q: Why does DF04 show lower reverse leakage (5 µA vs. 10 µA)?

A: Lower reverse leakage indicates improved device quality and reduced off-state current. This is a performance enhancement and does not affect substitution compatibility.

Q: Is the SMC Diode Solutions DB104 the same as the original Micro Commercial Co DB104?

A: Both are electrically identical (400V, 1A, -55 to 150°C) with the same package. The SMC version is active production status with ROHS3 compliance, making it the preferred choice for new designs.

Q: What does "ROHS3 Compliant" mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. For applications requiring RoHS compliance, select parts marked "ROHS3 Compliant." The original DB104 is RoHS non-compliant.

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