DL4001 Equivalent & Substitute Parts

Part Overview

The DL4001 is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount MELF (DO-213AB) package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging and compliance certifications.

Key Parameters

Parameter	DL4001 Specification
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 50 V
Speed	Standard Recovery >500ns, > 200mA (Io)
Mounting Type	Surface Mount
Package / Case	DO-213AB, MELF
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DL4001 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic is determined by the following parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Mounting Type: Must be Surface Mount
Package / Case: Must be DO-213AB or MELF compatible
Moisture Sensitivity Level (MSL): Must be 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Operating range must accommodate 1.1 V @ 1 A or lower
Current - Reverse Leakage @ Vr: Must not exceed 10 µA @ 50 V
Speed: Standard or Fast Recovery acceptable

Substitute parts are divided into two categories:

Category A - Direct Electrical Equivalents (1 A rated current, DO-213AB package): Parts with identical 1 A current rating and DO-213AB packaging that maintain the same electrical performance envelope.

Category B - Higher Current Capability (3 A rated current, alternative MELF packages): Parts with elevated current ratings (3 A) that provide enhanced performance margin while maintaining 50 V voltage rating and surface mount configuration. These parts accommodate applications requiring higher current capacity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Speed	Package	Product Status	RoHS Status
DL4001	Micro Commercial Co	50 V	1	1.1 V @ 1 A	5 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Obsolete	RoHS non-compliant
1N6478-E3/97	Vishay General Semiconductor	50 V	1	1.1 V @ 1 A	10 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Active	ROHS3 Compliant
1N6478HE3/96	Vishay General Semiconductor	50 V	1	1.1 V @ 1 A	10 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Active	ROHS3 Compliant
1N6478HE3/97	Vishay General Semiconductor	50 V	1	1.1 V @ 1 A	10 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Active	ROHS3 Compliant
BYM10-50HE3/96	Vishay General Semiconductor	50 V	1	1.1 V @ 1 A	10 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Active	ROHS3 Compliant
BYM10-50HE3/97	Vishay General Semiconductor	50 V	1	1.1 V @ 1 A	10 µA @ 50 V	Standard Recovery >500ns	DO-213AB, MELF	Active	ROHS3 Compliant
BYM12-50-E3/96	Vishay General Semiconductor	50 V	1	1.0 V @ 1 A	5 µA @ 50 V	Fast Recovery ≤500ns	DO-213AB, MELF	Active	ROHS3 Compliant
BYM12-50-E3/97	Vishay General Semiconductor	50 V	1	1.0 V @ 1 A	5 µA @ 50 V	Fast Recovery ≤500ns	DO-213AB, MELF	Active	ROHS3 Compliant
EGL41A-E3/96	Vishay General Semiconductor	50 V	1	1.0 V @ 1 A	5 µA @ 50 V	Fast Recovery ≤500ns	DO-213AB, MELF	Active	ROHS3 Compliant
1N5807URS	Microchip Technology	50 V	3	875 mV @ 4 A	5 µA @ 50 V	Fast Recovery ≤500ns	SQ-MELF, B	Active	Not specified
1N6073US	Microchip Technology	50 V	3	2.04 V @ 9.4 A	1 µA @ 50 V	Fast Recovery ≤500ns	SQ-MELF, A	Active	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance and Package):

The Vishay General Semiconductor parts 1N6478-E3/97, 1N6478HE3/96, 1N6478HE3/97, BYM10-50HE3/96, and BYM10-50HE3/97 provide direct electrical equivalence to the DL4001 with identical 50 V, 1 A ratings and DO-213AB MELF packaging. These parts are in active production status. The 1N6478 series and BYM10 series maintain standard recovery characteristics matching the original specification. All Vishay parts listed are ROHS3 compliant, addressing regulatory requirements not met by the obsolete DL4001.

For Enhanced Performance with Improved Compliance:

The Vishay BYM12-50-E3/96 and BYM12-50-E3/97 parts offer improved electrical characteristics including fast recovery operation (≤500ns), lower forward voltage (1.0 V @ 1 A), and ROHS3 compliance. These parts maintain the 50 V, 1 A rating and DO-213AB package while providing performance enhancement. The EGL41A-E3/96 part from Vishay provides identical performance characteristics to the BYM12 series with ROHS3 compliance and active product status.

For Higher Current Applications:

The Microchip Technology 1N5807URS provides 3 A current capability at 50 V reverse voltage with fast recovery characteristics and SQ-MELF packaging. This part accommodates applications requiring higher current capacity while maintaining the 50 V voltage rating. The 1N6073US from Microchip also provides 3 A capability with enhanced reverse leakage performance (1 µA @ 50 V) and D-5A package configuration.

Compliance Considerations:

All recommended Vishay substitutes (1N6478 series, BYM10 series, BYM12 series, EGL41A series) are ROHS3 compliant and REACH unaffected, addressing modern regulatory requirements. The Microchip 1N5807URS is REACH unaffected. The 1N6073US is RoHS non-compliant, limiting its application in regulated environments.

Frequently Asked Questions (FAQ)

Q: Can the DL4001 be directly replaced with any of the listed substitute parts?

A: Direct replacement is possible with parts maintaining identical electrical specifications and packaging. The Vishay 1N6478-E3/97, 1N6478HE3/96, 1N6478HE3/97, BYM10-50HE3/96, and BYM10-50HE3/97 provide direct equivalence with 50 V, 1 A ratings and DO-213AB MELF packaging. These parts are pin-compatible and electrically interchangeable.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Recovery speed refers to the time required for a diode to transition from conducting to blocking state. The DL4001 specifies standard recovery (>500ns), while some substitutes offer fast recovery (≤500ns). Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Both types are acceptable for the DL4001 application unless specific circuit timing requirements mandate standard recovery characteristics.

Q: Why do some substitute parts have higher current ratings (3 A) than the DL4001 (1 A)?

A: Higher current-rated parts (1N5807URS, 1N6073US) provide enhanced performance margin and thermal headroom for applications approaching the 1 A limit. These parts maintain the 50 V voltage rating while accommodating higher current demands. Selection depends on actual circuit current requirements; oversizing is acceptable but unnecessary for applications strictly limited to 1 A operation.

Q: Are the Microchip parts (1N5807URS, 1N6073US) compatible with the DL4001 application?

A: The 1N5807URS is compatible with the DL4001 application, providing 50 V, 3 A capability in SQ-MELF packaging with fast recovery characteristics. The 1N6073US is also compatible electrically but uses D-5A package configuration and is RoHS non-compliant. Package differences may require PCB layout modifications.

Q: What is the significance of RoHS compliance for the DL4001 replacement?

A: RoHS compliance restricts hazardous substances in electronic components. The original DL4001 is RoHS non-compliant. All recommended Vishay substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and production in regulated markets. The Microchip 1N6073US is RoHS non-compliant and unsuitable for RoHS-regulated applications.

Q: Can forward voltage differences between substitute parts affect circuit performance?

A: Forward voltage differences are minor across the recommended substitutes (1.0 V to 1.1 V @ 1 A). These variations fall within typical circuit tolerance margins for rectifier applications. Circuits with strict voltage regulation requirements should be evaluated individually, but standard rectifier applications accommodate this range without modification.

Q: What packaging considerations apply when selecting a substitute?

A: The DL4001 uses DO-213AB MELF packaging. Direct replacements (1N6478, BYM10, BYM12, EGL41A series) maintain identical packaging for direct PCB compatibility. The Microchip 1N5807URS uses SQ-MELF packaging (compatible MELF variant), while the 1N6073US uses D-5A package, both requiring PCB layout verification before implementation.

Q: Is moisture sensitivity a concern when selecting a substitute?

A: All listed parts specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage and handling requirements are identical to the original DL4001. No special moisture control measures are required during component storage or assembly.

Q: Which substitute part offers the best overall compatibility with the DL4001?

A: The Vishay BYM12-50-E3/97 provides optimal compatibility, offering identical 50 V, 1 A electrical specifications, DO-213AB MELF packaging, ROHS3 compliance, and active product status with high inventory availability (20,200 pcs). This part directly addresses the obsolescence of the DL4001 while meeting modern regulatory requirements.

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