EM01A Equivalent & Substitute Parts

Part Overview

The EM01A is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 600 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as Active product status and is RoHS Compliant. Substitute parts are necessary when the EM01A becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple suppliers is needed for supply chain continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 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 @ 600 V
Mounting Type	Through Hole
Package / Case	Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the EM01A are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Speed: Standard Recovery >500ns, > 200mA (Io)
Technology: Standard

Package Compatibility: The EM01A uses an Axial package. Substitute parts may be available in DO-204AL (DO-41) or Axial configurations. Both package types are through-hole mounted and mechanically compatible in standard PCB applications.

Compliance Considerations: RoHS compliance status varies among substitute parts. The EM01A is RoHS Compliant. Substitute parts with ROHS3 Compliant or RoHS non-compliant status may be selected based on application requirements and regulatory jurisdiction.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Temp Range	RoHS Status	Product Status
EM01A	Sanken Electric USA Inc.	600 V	1 A	970 mV @ 1 A	Axial	-40°C ~ 150°C	RoHS Compliant	Active
1N4005-E3/54	Vishay General Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4005-E3/73	Vishay General Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4005-T	Diodes Incorporated	600 V	1 A	1 V @ 1 A	DO-41	-65°C ~ 150°C	ROHS3 Compliant	Last Time Buy
1N4005-TP	Micro Commercial Co	600 V	1 A	1.1 V @ 1 A	DO-41	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4005G	Good-Ark Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL (DO-41)	-55°C ~ 150°C	ROHS3 Compliant	Active
1N4005G-T	Diodes Incorporated	600 V	1 A	1 V @ 1 A	DO-41	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4005GP-E3/54	Vishay General Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4005GP-E3/73	Vishay General Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL (DO-41)	-65°C ~ 175°C	ROHS3 Compliant	Active
1N4005RLG	onsemi	600 V	1 A	1.1 V @ 1 A	Axial	-65°C ~ 175°C	ROHS3 Compliant	Not For New Designs
1N4247	Microchip Technology	600 V	1 A	1.3 V @ 3 A	Axial	-65°C ~ 175°C	RoHS non-compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

The 1N4005GP-E3/54 and 1N4005GP-E3/73 from Vishay General Semiconductor are the preferred substitutes. Both parts maintain the 600 V / 1 A electrical specifications, offer extended operating temperature range (-65°C ~ 175°C), and carry ROHS3 Compliant certification. These parts are available in DO-204AL (DO-41) package format and are designated as Active products.

Alternative Substitutes (Active Status, ROHS3 Compliant):

The 1N4005-TP from Micro Commercial Co and 1N4005G from Good-Ark Semiconductor are suitable alternatives with Active product status and ROHS3 compliance. The 1N4005G-T from Diodes Incorporated offers an extended upper operating temperature limit of 175°C and is Active status.

Axial Package Alternatives:

The 1N4005RLG from onsemi maintains the axial package format identical to the EM01A. However, this part carries a "Not For New Designs" product status designation and should be used only for legacy system maintenance or repair applications.

Non-Compliant Alternative:

The 1N4247 from Microchip Technology meets the electrical specifications but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not required.

Last Time Buy Consideration:

The 1N4005-T from Diodes Incorporated is designated as Last Time Buy. This status indicates the manufacturer has announced end-of-life for this product. Selection of this part should be limited to applications where long-term availability is not critical.

Frequently Asked Questions (FAQ)

Q: Can I substitute the EM01A with any 600 V / 1 A diode?

A: No. Substitution requires matching the specified electrical parameters (600 V reverse voltage, 1 A average rectified current, standard recovery speed >500ns), mounting type (through-hole), and package compatibility. Forward voltage characteristics and operating temperature range must also be evaluated for the specific application.

Q: What is the difference between DO-204AL and DO-41 packages?

A: DO-204AL and DO-41 are equivalent designations for the same through-hole axial package format. Both terms refer to the same physical package used by multiple manufacturers. The EM01A uses an Axial package, which is mechanically compatible with DO-204AL (DO-41) components in standard PCB applications.

Q: Why do some substitute parts have different forward voltage specifications?

A: Forward voltage (Vf) varies among manufacturers due to differences in semiconductor material quality, junction design, and manufacturing processes. The EM01A specifies 970 mV @ 1 A, while substitute parts range from 1.0 V to 1.3 V @ 1 A or @ 3 A. These variations are within acceptable limits for general-purpose rectifier applications but should be evaluated for circuits with tight voltage regulation requirements.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other jurisdictions. The EM01A is RoHS Compliant. Most substitute parts carry ROHS3 Compliant status. The 1N4247 is RoHS non-compliant and should be used only in applications where RoHS compliance is not required.

Q: What does "Last Time Buy" or "Not For New Designs" mean?

A: These product status designations indicate that the manufacturer has announced end-of-life for the component. "Last Time Buy" means the manufacturer will accept orders for a limited time before discontinuation. "Not For New Designs" means the component should not be used in new product development. These parts are suitable only for legacy system maintenance or repair.

Q: Can I use the 1N4247 as a direct replacement for the EM01A?

A: The 1N4247 meets the core electrical specifications (600 V, 1 A) and uses an axial package. However, it carries RoHS non-compliant status and specifies forward voltage at 3 A rather than 1 A. Use the 1N4247 only if RoHS compliance is not required and the application can tolerate the different forward voltage specification.

Q: Which substitute offers the widest operating temperature range?

A: Multiple substitutes offer -65°C ~ 175°C operating temperature range, including 1N4005G-T, 1N4005GP-E3/54, 1N4005GP-E3/73, 1N4005RLG, and 1N4247. The EM01A is limited to -40°C ~ 150°C. Select extended-range parts only if the application requires operation outside the EM01A temperature limits.

Q: Are there inventory considerations for substitute selection?

A: Yes. Inventory levels vary significantly among substitute parts. The 1N4005-E3/73 has 80,421 pieces in stock, while 1N4005RLG has only 1,200 pieces. High-volume applications should prioritize parts with substantial inventory availability to ensure supply continuity.

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