DF04M/45 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF04M/45 is a single-phase bridge rectifier diode 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, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part is housed in a 4-EDIP (0.300", 7.62mm) through-hole package and operates across a temperature range of -55°C to 150°C.

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
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-EDIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitution for the DF04M/45 is determined by the following critical parameters:

Voltage Rating: Peak reverse voltage must be 400 V or higher to maintain circuit protection margins
Current Rating: Average rectified current must be 1 A or higher to handle design load requirements
Forward Voltage Drop: Maximum forward voltage of 1.1 V @ 1 A ensures thermal and efficiency compatibility
Package Compatibility: Through-hole mounting in 4-EDIP format with 0.300" (7.62mm) or 0.321" (8.15mm) spacing for PCB layout compatibility
Operating Temperature Range: -55°C to 150°C junction temperature for environmental suitability

Substitute parts are grouped into two categories:

Direct Equivalents (identical electrical and mechanical specifications):

DF04M-E3/45 (Vishay, Active status, ROHS3 compliant)
DF04M (onsemi, Obsolete status, higher current rating of 1.5 A)

Functional Substitutes (meet or exceed all critical parameters):

DB104-BP (Micro Commercial Co, 400 V / 1 A, Not For New Designs)
DB105-BP (Micro Commercial Co, 600 V / 1 A, Active status)
DB106-BP (Micro Commercial Co, 800 V / 1 A, Active status)
DB107-BP (Micro Commercial Co, 1 kV / 1 A, Active status)
DF005M (Fairchild Semiconductor, 50 V / 1 A, Active status)

Lower voltage-rated parts (DB101-BP, DB102-BP, DB103-BP, DF005M) are listed as functional alternatives but operate below the 400 V specification and are suitable only for applications with reduced voltage requirements.

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	RoHS Status
DF04M/45	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.300", 7.62mm)	Obsolete	RoHS non-compliant
DF04M-E3/45	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-EDIP (0.300", 7.62mm)	Active	ROHS3 Compliant
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	ROHS3 Compliant
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	ROHS3 Compliant
DB105-BP	Micro Commercial Co	600 V	1 A	1.1 V @ 1 A	10 µA @ 600 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active	ROHS3 Compliant
DB106-BP	Micro Commercial Co	800 V	1 A	1.1 V @ 1 A	10 µA @ 800 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active	ROHS3 Compliant
DB107-BP	Micro Commercial Co	1 kV	1 A	1.1 V @ 1 A	10 µA @ 1000 V	-55°C ~ 150°C	4-EDIP (0.321", 8.15mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: DF04M-E3/45

The DF04M-E3/45 is the optimal direct replacement for the obsolete DF04M/45. It maintains identical electrical specifications (400 V, 1 A) and mechanical compatibility (4-EDIP 0.300" package). The part is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Inventory availability is substantial at 17,819 pieces.

Secondary Recommendation: DB104-BP

The DB104-BP provides functional equivalence with 400 V / 1 A ratings and ROHS3 compliance. The package footprint differs slightly (0.321" vs. 0.300" spacing), requiring PCB layout verification. Product status is "Not For New Designs," limiting suitability for new development but acceptable for legacy system maintenance. Inventory is available at 7,488 pieces.

Higher Voltage Alternatives: DB105-BP, DB106-BP, DB107-BP

These parts exceed the 400 V specification with active product status and ROHS3 compliance. DB105-BP (600 V) and DB106-BP (800 V) are recommended only when circuit design permits higher voltage ratings without performance degradation. DB107-BP (1 kV) is suitable for applications requiring maximum voltage margin. All three maintain 1 A current rating and -55°C to 150°C operating range.

Not Recommended for Direct Substitution:

Parts with voltage ratings below 400 V (DB101-BP, DB102-BP, DB103-BP, DF005M) do not meet the original specification and are suitable only for applications with reduced voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can DF04M-E3/45 be used as a direct replacement for DF04M/45?

A: Yes. The DF04M-E3/45 is electrically and mechanically identical to the DF04M/45, with identical voltage (400 V), current (1 A), forward voltage drop (1.1 V @ 1 A), and package dimensions (4-EDIP 0.300"). The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the 0.300" and 0.321" package spacing?

A: The 0.300" (7.62mm) and 0.321" (8.15mm) refer to the center-to-center distance between pin rows. While both are 4-EDIP through-hole packages, the spacing difference requires PCB layout verification. Parts with 0.321" spacing (DB-series) may not fit directly into boards designed for 0.300" spacing without modification.

Q: Can DB105-BP or DB106-BP be used instead of DF04M/45?

A: Yes, functionally. Both parts exceed the 400 V specification (600 V and 800 V respectively) and maintain 1 A current rating. Higher voltage ratings provide additional safety margin but may introduce unnecessary cost. Use only if circuit design permits higher voltage operation without performance impact.

Q: Why do some substitute parts have higher reverse leakage current (10 µA vs. 5 µA)?

A: Reverse leakage current is a characteristic of the diode technology and manufacturing process. The DB-series parts (10 µA @ rated voltage) have slightly higher leakage than the DF-series (5 µA @ rated voltage). This difference is within acceptable limits for standard bridge rectifier applications and does not affect functional compatibility.

Q: Is DF04M from onsemi a suitable substitute?

A: DF04M from onsemi meets the 400 V / 1 A specification with higher current capability (1.5 A) and ROHS3 compliance. However, it is classified as obsolete, limiting long-term availability. DF04M-E3/45 from Vishay is preferred due to active production status.

Q: What is the operating temperature range compatibility?

A: All recommended substitute parts operate across -55°C to 150°C junction temperature, matching the original DF04M/45 specification. This ensures thermal compatibility in applications with identical environmental requirements.

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