EM01Z General Purpose Rectifier Diode – Equivalent & Substitute Parts

Part Overview

The EM01Z is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 200 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as Active product status with RoHS compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the EM01Z becomes unavailable from inventory, when alternative sourcing is required for supply chain continuity, or when design flexibility permits selection from multiple qualified manufacturers offering equivalent electrical and mechanical specifications.

Key Parameters

Parameter	EM01Z Specification
Voltage – DC Reverse (Vr) (Max)	200 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 @ 200 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

Substitution eligibility for the EM01Z is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage – DC Reverse (Vr) (Max): 200 V
Current – Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: Axial or equivalent axial form factor (DO-204AL, DO-41)

Acceptable Variation Ranges:

Voltage – Forward (Vf) (Max) @ If: EM01Z specifies 970 mV @ 1 A; substitute parts with forward voltage up to 1.1 V @ 1 A remain functionally compatible
Current – Reverse Leakage @ Vr: EM01Z specifies 10 µA @ 200 V; substitute parts with leakage up to 5 µA @ 200 V represent improved performance
Operating Temperature – Junction: EM01Z specifies –40°C ~ 150°C; substitute parts with extended ranges (–65°C ~ 175°C) provide additional margin
Speed: All substitute parts maintain Standard Recovery >500ns, > 200mA (Io) specification

Compliance Considerations:

RoHS Status: EM01Z is RoHS Compliant; substitute parts with ROHS3 Compliant status are acceptable
Moisture Sensitivity Level: All substitute parts maintain MSL 1 (Unlimited)

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range (Tj)	RoHS Status	Product Status
EM01Z	Sanken Electric USA Inc.	200 V	1 A	970 mV @ 1 A	10 µA @ 200 V	Axial	–40°C ~ 150°C	RoHS Compliant	Active
1N3611	Microchip Technology	200 V	1 A	1.1 V @ 1 A	1 µA @ 200 V	A, Axial	–65°C ~ 175°C	RoHS non-compliant	Active
1N3611GP-E3/54	Vishay General Semiconductor – Diodes Division	200 V	1 A	1 V @ 1 A	1 µA @ 200 V	DO-204AL, DO-41, Axial	–65°C ~ 175°C	ROHS3 Compliant	Active
1N4003-E3/53	Vishay General Semiconductor – Diodes Division	200 V	1 A	1.1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-E3/54	Vishay General Semiconductor – Diodes Division	200 V	1 A	1.1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-E3/73	Vishay General Semiconductor – Diodes Division	200 V	1 A	1.1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–55°C ~ 150°C	ROHS3 Compliant	Active
1N4003-T	Diodes Incorporated	200 V	1 A	1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–65°C ~ 150°C	ROHS3 Compliant	Last Time Buy
1N4003-TP	Micro Commercial Co	200 V	1 A	1.1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–55°C ~ 150°C	ROHS3 Compliant	Not For New Designs
1N4003G	Taiwan Semiconductor Corporation	200 V	1 A	1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–55°C ~ 150°C	ROHS3 Compliant	Active
1N4003G-T	Diodes Incorporated	200 V	1 A	1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–65°C ~ 175°C	ROHS3 Compliant	Active
1N4003GP-E3/54	Vishay General Semiconductor – Diodes Division	200 V	1 A	1.1 V @ 1 A	5 µA @ 200 V	DO-204AL, DO-41, Axial	–65°C ~ 175°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The following parts are recommended as direct substitutes for the EM01Z based on Active product status and ROHS3 compliance:

1N3611GP-E3/54 (Vishay General Semiconductor – Diodes Division): Meets all electrical parameters with forward voltage of 1 V @ 1 A and extended operating temperature range (–65°C ~ 175°C). Available in DO-204AL (DO-41) axial package with 20,056 units in stock.
1N4003-E3/53, 1N4003-E3/54, 1N4003-E3/73 (Vishay General Semiconductor – Diodes Division): All three variants meet electrical specifications with forward voltage of 1.1 V @ 1 A and reverse leakage of 5 µA @ 200 V. Operating temperature range –55°C ~ 150°C matches EM01Z upper limit. Available in DO-204AL (DO-41) axial package with combined inventory exceeding 69,000 units.
1N4003G (Taiwan Semiconductor Corporation): Meets all electrical parameters with forward voltage of 1 V @ 1 A. Available in DO-204AL (DO-41) axial package with 27,889 units in stock.
1N4003G-T (Diodes Incorporated): Meets all electrical parameters with forward voltage of 1 V @ 1 A and extended operating temperature range (–65°C ~ 175°C). Available in DO-41 axial package with 2,900 units in stock.
1N4003GP-E3/54 (Vishay General Semiconductor – Diodes Division): Meets all electrical parameters with forward voltage of 1.1 V @ 1 A and extended operating temperature range (–65°C ~ 175°C). Available in DO-204AL (DO-41) axial package with 6,663 units in stock.

Secondary Substitutes (Conditional Use):

1N3611 (Microchip Technology): Meets all electrical parameters but carries RoHS non-compliant status. Use only in applications where RoHS compliance is not required. Available in A, Axial package with 1,465 units in stock.
1N4003-T (Diodes Incorporated): Meets all electrical parameters with forward voltage of 1 V @ 1 A. Product status is Last Time Buy, indicating limited future availability. Use only when primary substitutes are unavailable. Available in DO-41 axial package with 38,027 units in stock.
1N4003-TP (Micro Commercial Co): Meets all electrical parameters with forward voltage of 1.1 V @ 1 A. Product status is Not For New Designs, indicating obsolescence trajectory. Use only in legacy system maintenance. Available in DO-41 axial package with 34,146 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the EM01Z be replaced with any 200 V, 1 A diode?

A: No. Substitution requires matching the 200 V reverse voltage rating, 1 A average rectified current, and through-hole axial package form factor. Forward voltage, reverse leakage, and operating temperature range must fall within acceptable variation ranges specified in the Parameter Comparison table.

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

A: DO-204AL and DO-41 are equivalent package designations for the same axial through-hole diode form factor. Both terms refer to the same physical package used by multiple manufacturers.

Q: Why do some substitute parts have lower reverse leakage current than the EM01Z?

A: Lower reverse leakage current (5 µA versus 10 µA @ 200 V) represents improved device performance and is acceptable for substitution. This does not affect functional compatibility; it only provides additional margin in circuit operation.

Q: Is the EM01Z forward voltage of 970 mV significantly different from substitute parts rated at 1 V or 1.1 V?

A: The EM01Z forward voltage of 970 mV is within the normal variation range for general-purpose rectifier diodes. Substitute parts with forward voltage up to 1.1 V @ 1 A are functionally compatible. The difference of 30–130 mV is negligible in most rectifier circuit applications.

Q: Can I use a substitute part with an extended operating temperature range (–65°C ~ 175°C) in place of the EM01Z (–40°C ~ 150°C)?

A: Yes. An extended operating temperature range provides additional design margin and is acceptable for substitution. The substitute part will operate safely within the EM01Z temperature specification and beyond.

Q: Why is RoHS compliance status important for substitution?

A: RoHS compliance status indicates regulatory conformance to hazardous substance restrictions. The EM01Z is RoHS Compliant. Substitute parts with ROHS3 Compliant status maintain this compliance. Parts with RoHS non-compliant status should be used only in applications where RoHS compliance is not required.

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

A: Last Time Buy indicates the manufacturer will cease production after a final order window. Not For New Designs indicates the part is obsolete and should not be selected for new circuit designs. These parts are acceptable only for legacy system maintenance or when primary substitutes are unavailable.

Q: Are all substitute parts available in the same packaging format as the EM01Z?

A: The EM01Z is supplied in Bulk packaging. Most substitute parts are available in Cut Tape (CT) or Tape & Reel (TR) packaging. Physical form factor (axial through-hole) remains consistent across all substitutes. Packaging format does not affect electrical or mechanical compatibility.

Q: Can I mix different substitute parts in the same circuit board assembly?

A: Yes. All listed substitute parts meet the same electrical specifications and are mechanically compatible. Mixing different manufacturers or part numbers in the same assembly is acceptable from an engineering standpoint.

Q: Which substitute part offers the best overall compatibility with the EM01Z?

A: The 1N3611GP-E3/54 (Vishay General Semiconductor – Diodes Division) and 1N4003G-T (Diodes Incorporated) offer the closest electrical match with forward voltage of 1 V @ 1 A and extended operating temperature ranges. Both are Active status with ROHS3 compliance and high inventory availability.

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