EM1 General Purpose Rectifier Diode 400V 1A Equivalent & Substitute Parts

Part Overview

The EM1 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.

Substitute parts are necessary when the EM1 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for equivalent electrical performance from alternative manufacturers. All substitute parts listed maintain the core electrical parameters: 400V reverse voltage rating, 1A current capacity, and through-hole mounting configuration.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	970 mV @ 1 A	mV
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 to 150	°C
RoHS Status	RoHS Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the EM1 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400V minimum
Current - Average Rectified (Io): 1A minimum
Mounting Type: Through Hole
Speed Classification: Standard Recovery >500ns, > 200mA (Io)
Package / Case: Axial or DO-204AL (DO-41) compatible

Secondary Considerations:

Voltage - Forward (Vf) (Max) @ If: Substitute parts range from 970 mV to 1.1 V at 1A, all within acceptable rectification performance
Current - Reverse Leakage @ Vr: Substitute parts range from 5 µA to 200 nA at 400V, representing improved or equivalent performance
Operating Temperature - Junction: Substitute parts extend from -65°C to -40°C minimum and 150°C to 175°C maximum, providing equal or superior thermal range

All listed substitute parts meet or exceed the EM1 electrical specifications and maintain through-hole mounting compatibility. Package variations (Axial, DO-204AL, DO-41) are mechanically interchangeable in standard through-hole PCB applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (mV)	Reverse Leakage @ 400V	Package	Temp Range (°C)	Product Status
EM1	Sanken Electric USA Inc.	400	1	970	10 µA	Axial	-40 to 150	Active
1N4004-E3/54	Vishay General Semiconductor	400	1	1100	5 µA	DO-204AL (DO-41)	-55 to 150	Active
1N4004-E3/73	Vishay General Semiconductor	400	1	1100	5 µA	DO-204AL (DO-41)	-55 to 150	Active
1N4004-T	Diodes Incorporated	400	1	1000	5 µA	DO-41	-65 to 150	Last Time Buy
1N4004-TP	Micro Commercial Co	400	1	1100	5 µA	DO-41	-55 to 150	Active
1N4004G	Rectron USA	400	1	1000	200 nA	DO-41	-65 to 175	Active
1N4004G-T	Diodes Incorporated	400	1	1000	5 µA	DO-41	-65 to 175	Active
1N4004GP-E3/54	Vishay General Semiconductor	400	1	1100	5 µA	DO-204AL (DO-41)	-65 to 175	Active
1N4004GP-E3/73	Vishay General Semiconductor	400	1	1100	5 µA	DO-204AL (DO-41)	-65 to 175	Active
1N4004GP-TP	Micro Commercial Co	400	1	1100	5 µA	DO-41	-55 to 150	Active
1N4004RLG	onsemi	400	1	1100	10 µA	Axial	-65 to 175	Not For New Designs

Engineering Selection Recommendations

Active Status Parts (Recommended for New Designs):

The following substitute parts carry Active product status and are suitable for new design implementations:

1N4004-E3/54 (Vishay): Active status, ROHS3 compliant, standard recovery characteristics, DO-204AL package
1N4004-E3/73 (Vishay): Active status, ROHS3 compliant, standard recovery characteristics, DO-204AL package with Tape & Box packaging
1N4004-TP (Micro Commercial Co): Active status, ROHS3 compliant, extended temperature range to 150°C, DO-41 package
1N4004G (Rectron USA): Active status, ROHS3 compliant, AEC-Q101 automotive qualified, extended temperature range to 175°C, superior reverse leakage performance (200 nA)
1N4004G-T (Diodes Incorporated): Active status, ROHS3 compliant, extended temperature range to 175°C, DO-41 package
1N4004GP-E3/54 (Vishay SUPERECTIFIER® series): Active status, ROHS3 compliant, extended temperature range to 175°C, DO-204AL package
1N4004GP-E3/73 (Vishay SUPERECTIFIER® series): Active status, ROHS3 compliant, extended temperature range to 175°C, DO-204AL package
1N4004GP-TP (Micro Commercial Co): Active status, ROHS3 compliant, DO-41 package

Conditional Use Parts:

1N4004-T (Diodes Incorporated): Last Time Buy status indicates this part is in end-of-life phase. Use only when existing inventory is available and long-term supply is not required
1N4004RLG (onsemi): Not For New Designs status. This part is restricted from new design implementations and should be used only for legacy system maintenance or repair

Compliance Considerations:

All substitute parts listed carry ROHS3 compliance or RoHS Compliant status, meeting environmental regulatory requirements. The EM1 carries RoHS Compliant status. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Package Selection:

Axial Package: EM1 and 1N4004RLG maintain the original axial through-hole format
DO-204AL (DO-41) Package: Vishay 1N4004 series and Diodes Incorporated 1N4004G-T provide standard DO-41 compatibility
Packaging Format: Cut Tape (CT), Tape & Box (TB), and Tape & Reel (TR) options are available across manufacturers for different assembly processes

Frequently Asked Questions (FAQ)

Q: Can I substitute the EM1 with any of the listed 1N4004 variants?

A: Yes. All listed 1N4004 variants meet the core electrical specifications of the EM1: 400V reverse voltage, 1A average rectified current, and standard recovery characteristics. The primary difference is package format (Axial vs. DO-41) and operating temperature range. Verify your PCB layout accommodates the selected package type.

Q: What is the difference between Axial and DO-41 packages?

A: Both are through-hole packages suitable for PCB mounting. Axial packages have leads extending from opposite ends of the component body. DO-41 (DO-204AL) packages have leads extending from the same end. Both are mechanically and electrically interchangeable in standard through-hole applications. Verify your PCB footprint design before selection.

Q: Why do some parts show "Last Time Buy" or "Not For New Designs" status?

A: These designations indicate the manufacturer is discontinuing the part. Last Time Buy parts have limited remaining inventory. Not For New Designs parts should not be used in new product development. Use Active status parts for new designs to ensure long-term supply availability.

Q: What is the significance of the forward voltage (Vf) difference between the EM1 (970 mV) and substitute parts (1000-1100 mV)?

A: The EM1 exhibits lower forward voltage drop at 1A compared to most substitutes. In rectification applications, this difference results in marginally lower power dissipation in the EM1. However, all values fall within standard rectifier performance ranges. Substitute parts with higher Vf will generate slightly more heat but remain functionally equivalent for standard applications.

Q: What does "Standard Recovery >500ns, > 200mA (Io)" mean?

A: This specifies the reverse recovery time classification. Standard recovery diodes have recovery times exceeding 500 nanoseconds at currents greater than 200 milliamps. All listed parts share this classification, ensuring consistent switching behavior in rectification circuits.

Q: Are the Vishay SUPERECTIFIER® parts (1N4004GP series) superior to standard 1N4004 parts?

A: The SUPERECTIFIER® designation indicates optimized performance characteristics. These parts feature lower capacitance (8pF vs. 15pF) and extended temperature range (-65°C to 175°C vs. -55°C to 150°C). For standard rectification applications, the performance difference is minimal. Select SUPERECTIFIER® variants when lower capacitance or extended temperature operation is required.

Q: Can I use the 1N4004G automotive-qualified part in non-automotive applications?

A: Yes. The 1N4004G carries AEC-Q101 automotive qualification, indicating it meets stringent automotive reliability standards. This qualification exceeds requirements for general industrial and consumer applications. The part is suitable for any application requiring 400V 1A rectification.

Q: What is the difference between Cut Tape (CT), Tape & Box (TB), and Tape & Reel (TR) packaging?

A: These are supply format variations, not component variations. Cut Tape provides individual components on carrier tape. Tape & Box supplies components on tape in a box. Tape & Reel supplies components on continuous reel tape. All three formats contain electrically identical components. Selection depends on your assembly process and volume requirements.

Q: Is the EM1 still available, or should I transition to a substitute?

A: The EM1 is listed as Active with 922 pieces in stock. However, multiple substitute parts carry higher inventory levels (up to 40,609 pieces for 1N4004GP-E3/54). If long-term supply security is a concern, consider transitioning to high-inventory alternatives while maintaining electrical equivalence.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All listed substitute parts carry ROHS3 Compliant or RoHS Compliant status, meeting environmental regulatory requirements equivalent to the EM1.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message