EM1Y Equivalent & Substitute Parts Reference

Part Overview

The EM1Y is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 100 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 with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the EM1Y becomes unavailable from inventory, when alternative sourcing is required for supply chain continuity, or when design flexibility permits selection from multiple qualified manufacturers meeting identical or superior electrical specifications.

Key Parameters

Parameter	EM1Y Specification
Voltage - DC Reverse (Vr) (Max)	100 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 @ 100 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 EM1Y is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: Axial or DO-204AL (DO-41) compatible with axial lead configuration

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may exceed the EM1Y specification of 970 mV @ 1 A, provided the value does not compromise circuit performance
Current - Reverse Leakage @ Vr: Substitute parts may be equal to or lower than the EM1Y specification of 10 µA @ 100 V
Speed: Substitute parts may be Standard Recovery (>500ns) or Fast Recovery (≤500ns)
Operating Temperature - Junction: Substitute parts must support the minimum range of -40°C ~ 150°C; extended ranges are acceptable
RoHS Status: ROHS3 Compliant or RoHS Compliant are equivalent
Capacitance @ Vr, F: When specified in substitute parts, this parameter does not restrict substitution

All substitute parts listed are Active or Last Time Buy product status, ensuring availability and design continuity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Reverse Leakage @ Vr	Package	Temp Range	Product Status
EM1Y	Sanken Electric USA Inc.	100 V	1 A	970 mV @ 1 A	Standard Recovery >500ns	10 µA @ 100 V	Axial	-40°C ~ 150°C	Active
1N4002-E3/53	Vishay General Semiconductor - Diodes Division	100 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-50°C ~ 150°C	Active
1N4002-E3/54	Vishay General Semiconductor - Diodes Division	100 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4002-E3/73	Vishay General Semiconductor - Diodes Division	100 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4002-T	Diodes Incorporated	100 V	1 A	1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-65°C ~ 150°C	Last Time Buy
1N4002-TP	Micro Commercial Co	100 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-55°C ~ 150°C	Not For New Designs
1N4002G	Taiwan Semiconductor Corporation	100 V	1 A	1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4002G-T	Diodes Incorporated	100 V	1 A	1 V @ 1 A	Standard Recovery >500ns	5 µA @ 100 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active
1N4002RLG	onsemi	100 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	10 µA @ 100 V	Axial	-65°C ~ 175°C	Not For New Designs
1N4934-E3/54	Vishay General Semiconductor - Diodes Division	100 V	1 A	1.2 V @ 1 A	Fast Recovery ≤500ns	5 µA @ 100 V	DO-204AL (DO-41)	-50°C ~ 150°C	Active
1N4934-E3/73	Vishay General Semiconductor - Diodes Division	100 V	1 A	1.2 V @ 1 A	Fast Recovery ≤500ns	5 µA @ 100 V	DO-204AL (DO-41)	-50°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Recommended for New Designs):

The 1N4002-E3/53, 1N4002-E3/54, 1N4002-E3/73, 1N4002G, 1N4002G-T, 1N4934-E3/54, and 1N4934-E3/73 are all Active product status and ROHS3 Compliant. These parts meet or exceed the electrical specifications of the EM1Y and are suitable for direct substitution in new designs.

The 1N4002G-T offers the widest operating temperature range (-65°C ~ 175°C) and lowest forward voltage (1 V @ 1 A), making it optimal for applications requiring extended thermal performance.

The 1N4934-E3/54 and 1N4934-E3/73 feature fast recovery characteristics (≤500ns) compared to the EM1Y standard recovery (>500ns), providing superior switching performance in high-frequency applications.

Secondary Substitutes (Last Time Buy or Not For New Designs):

The 1N4002-T (Last Time Buy) and 1N4002-TP (Not For New Designs) are electrically equivalent but subject to supply discontinuation. The 1N4002RLG (Not For New Designs) maintains axial packaging identical to the EM1Y but is designated for legacy applications only.

Package Compatibility:

The EM1Y uses axial packaging. Substitute parts in DO-204AL (DO-41) package are mechanically compatible with axial lead configurations and are interchangeable in through-hole PCB applications. The 1N4002RLG maintains identical axial packaging.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 1N4002-E3/73 for the EM1Y in my circuit?

A: Yes. The 1N4002-E3/73 meets all mandatory electrical criteria: 100 V reverse voltage, 1 A average rectified current, standard recovery speed, and through-hole mounting. The forward voltage is 1.1 V @ 1 A compared to the EM1Y at 970 mV @ 1 A, which is acceptable for general-purpose rectification applications. Both are RoHS Compliant and Active product status.

Q: What is the difference between the 1N4002 and 1N4934 series?

A: Both series are rated for 100 V and 1 A. The primary difference is recovery speed: 1N4002 parts feature standard recovery (>500ns), while 1N4934 parts feature fast recovery (≤500ns). Fast recovery diodes are preferred in switching power supplies and high-frequency applications where reduced reverse recovery time minimizes switching losses. For general-purpose rectification, either series is acceptable.

Q: Are DO-204AL (DO-41) packages compatible with axial lead PCB footprints?

A: Yes. DO-204AL and DO-41 designations refer to the same axial lead package format. Parts such as 1N4002-E3/53, 1N4002-E3/54, 1N4002-E3/73, 1N4002G, 1N4002G-T, 1N4934-E3/54, and 1N4934-E3/73 are mechanically and electrically compatible with EM1Y axial footprints.

Q: Why is the 1N4002-TP marked "Not For New Designs"?

A: Product status "Not For New Designs" indicates that the manufacturer has discontinued active development and recommends alternative parts for new circuit designs. However, the part remains electrically equivalent and may be used in legacy or maintenance applications where existing inventory is available.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current indicates the small current flowing through the diode when reverse-biased. The EM1Y specifies 10 µA @ 100 V, while most substitute parts specify 5 µA @ 100 V. Lower leakage is beneficial in precision analog circuits and high-impedance applications. For standard rectification, both values are acceptable.

Q: Can I use a 1N4934-E3/73 (fast recovery) instead of a 1N4002-E3/73 (standard recovery)?

A: Yes. Fast recovery diodes are a superset of standard recovery diodes for general-purpose applications. The 1N4934-E3/73 has a reverse recovery time of 200 ns compared to >500ns for standard recovery parts, making it suitable for all applications where the 1N4002-E3/73 is used. The trade-off is slightly higher forward voltage (1.2 V vs. 1.1 V @ 1 A).

Q: What does RoHS Compliant versus ROHS3 Compliant mean?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current version of the directive. For substitution purposes, both RoHS Compliant and ROHS3 Compliant parts are equivalent and interchangeable.

Q: Is the 1N4002RLG a direct replacement for the EM1Y?

A: The 1N4002RLG is electrically equivalent and maintains identical axial packaging. However, it is designated "Not For New Designs," indicating discontinued active support. It is suitable for direct replacement in existing applications but should not be selected for new circuit designs.

Q: What operating temperature range should I select?

A: The EM1Y operates from -40°C to 150°C. All listed substitute parts support this range or exceed it. For applications requiring extended temperature performance, the 1N4002G-T and 1N4002RLG offer -65°C to 175°C operation. For standard industrial applications, the -50°C to -55°C lower limit of most 1N4002 variants is sufficient.

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