EM01 General Purpose Rectifier Diode 400V 1A Equivalent & Substitute Parts

Part Overview

The EM01 is a general purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 400V DC reverse voltage and 1A average rectified current in an axial through-hole package. This component is classified as active and suitable for standard rectification applications requiring standard recovery characteristics.

Equivalent and substitute parts are necessary when the EM01 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple suppliers is needed for supply chain continuity. Substitute parts must maintain electrical equivalence across critical parameters including reverse voltage rating, forward current capacity, and thermal operating range.

Key Parameters

Parameter	EM01 Specification
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	970 mV @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Mounting Type	Through Hole
Package / Case	Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the EM01 are qualified based on the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Speed Classification: Must be Standard Recovery >500ns, > 200mA (Io)
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass or exceed -40°C to 150°C

Mechanical Compatibility Criteria:

Package / Case: Axial or DO-204AL (DO-41) configurations are mechanically compatible with through-hole PCB layouts
Moisture Sensitivity Level: Must be MSL 1 (Unlimited) or equivalent

Compliance Criteria:

RoHS Status: Must be RoHS Compliant or ROHS3 Compliant
ECCN and HTSUS classifications must match for regulatory consistency

Substitute parts are grouped into two categories: direct axial package equivalents and functionally equivalent DO-41 package alternatives. All listed substitutes maintain the 400V/1A electrical specification and standard recovery speed classification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Tj Range	RoHS Status	Product Status
EM01	Sanken Electric USA Inc.	400 V	1 A	970 mV @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 400 V	Axial	-40°C ~ 150°C	RoHS Compliant	Active
1N4004-E3/54	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4004-E3/73	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4004-T	Diodes Incorporated	400 V	1 A	1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 150°C	ROHS3 Compliant	Last Time Buy
1N4004-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4004G	Rectron USA	400 V	1 A	1 V @ 1 A	Standard Recovery >500ns, > 200mA	200 nA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4004G-T	Diodes Incorporated	400 V	1 A	1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4004GP-E3/54	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4004GP-E3/73	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4004GP-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4004RLG	onsemi	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 400 V	Axial	-65°C ~ 175°C	ROHS3 Compliant	Not For New Designs

Engineering Selection Recommendations

Active Status Substitutes (Preferred for New Designs):

The following parts are classified as Active and are suitable for new design implementations:

1N4004-E3/54 (Vishay): Active status, ROHS3 compliant, DO-204AL package, extended temperature range to -55°C
1N4004-E3/73 (Vishay): Active status, ROHS3 compliant, DO-204AL package, extended temperature range to -55°C
1N4004-TP (Micro Commercial Co): Active status, ROHS3 compliant, DO-204AL package
1N4004G (Rectron USA): Active status, ROHS3 compliant, automotive qualified (AEC-Q101), extended temperature range to -65°C ~ 175°C, lowest reverse leakage at 200 nA
1N4004G-T (Diodes Incorporated): Active status, ROHS3 compliant, extended temperature range to -65°C ~ 175°C
1N4004GP-E3/54 (Vishay SUPERECTIFIER® series): Active status, ROHS3 compliant, extended temperature range to -65°C ~ 175°C, highest inventory availability (40,609 pcs)
1N4004GP-E3/73 (Vishay SUPERECTIFIER® series): Active status, ROHS3 compliant, extended temperature range to -65°C ~ 175°C
1N4004GP-TP (Micro Commercial Co): Active status, ROHS3 compliant

Last Time Buy Status (Transition Required):

1N4004-T (Diodes Incorporated): Last Time Buy status indicates this part is being discontinued. Designs currently using this part require transition to an active alternative.

Not For New Designs (Legacy Only):

1N4004RLG (onsemi): Not For New Designs status restricts use to existing production or legacy applications only. This part maintains axial package compatibility with EM01 but should not be selected for new designs.

Package Compatibility Considerations:

The EM01 uses an axial package. Direct axial package substitutes are limited to 1N4004RLG. All other listed substitutes use DO-204AL (DO-41) package format, which is mechanically compatible with through-hole PCB layouts but requires verification of PCB footprint design. DO-41 packages have different lead spacing and form factor compared to axial packages.

Compliance and Certification:

All active substitute parts maintain ROHS3 compliance. The 1N4004G variant includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace EM01 with any of the listed 1N4004 variants?

A: Direct replacement depends on package format. The 1N4004RLG maintains the axial package format of EM01 and is mechanically interchangeable. All other substitutes use DO-204AL (DO-41) package format, which requires PCB footprint compatibility verification. Electrical specifications are equivalent across all listed parts.

Q: What is the difference between DO-204AL and axial packages?

A: Both are through-hole packages suitable for PCB mounting. DO-204AL (DO-41) and axial packages differ in physical dimensions and lead configuration. PCB design must accommodate the specific package form factor. Consult PCB layout documentation to confirm footprint compatibility before substitution.

Q: Why is 1N4004RLG marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and production of this part. While existing inventory may be available, new designs should select from parts with Active status to ensure long-term supply availability and manufacturer support.

Q: What is the significance of the 1N4004G automotive qualification?

A: The 1N4004G carries AEC-Q101 automotive qualification, indicating it meets automotive industry reliability and testing standards. This qualification is relevant only for applications requiring automotive-grade components. Standard industrial applications do not require this certification.

Q: How do forward voltage differences affect circuit performance?

A: The EM01 specifies 970 mV forward voltage at 1A, while most substitutes specify 1.0 to 1.1 V. These differences are within typical rectifier diode tolerances and do not affect circuit functionality in standard rectification applications. Power dissipation increases marginally with higher forward voltage; calculate thermal impact for high-current applications.

Q: Which substitute offers the best reverse leakage performance?

A: The 1N4004G offers the lowest reverse leakage at 200 nA @ 400V, compared to 5-10 µA for other variants. Lower reverse leakage reduces standby current and improves circuit efficiency in applications sensitive to leakage current.

Q: Are all substitutes RoHS compliant?

A: Yes. The EM01 is RoHS Compliant, and all listed substitutes are ROHS3 Compliant, meeting current RoHS directive requirements. ROHS3 compliance is a superset of RoHS compliance.

Q: What packaging formats are available for the 1N4004 base part number?

A: The 1N4004 base part number is available in multiple packaging formats: Cut Tape (CT), Tape & Box (TB), and Tape & Reel (TR). Packaging format affects order quantity, handling, and assembly process compatibility. Verify packaging requirements with manufacturing or procurement specifications.

Q: Can I use 1N4004-T as a substitute despite Last Time Buy status?

A: The 1N4004-T is electrically equivalent and currently available in inventory (7,665 pcs). However, Last Time Buy status means the manufacturer will not produce additional quantities after current stock is exhausted. Use this part only for existing production runs or legacy applications. Select Active status parts for new designs to avoid future supply interruption.

Q: What is the SUPERECTIFIER® designation on Vishay parts?

A: SUPERECTIFIER® is a Vishay product series designation indicating optimized rectifier performance characteristics. Parts bearing this designation (1N4004GP-E3/54, 1N4004GP-E3/73) maintain the same electrical specifications as standard 1N4004 variants but may include enhanced manufacturing processes or tighter tolerances.

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