ES1A Equivalent & Substitute Parts

Part Overview

The onsemi ES1A is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that maintain electrical and mechanical compatibility with existing applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 1 A	mV
Reverse Recovery Time (trr)	15	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C to 150°C	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ES1A is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max) @ If: Must be compatible with circuit design tolerances
Speed Classification: Must support Fast Recovery ≤ 500ns for > 200mA (Io) applications, or Standard Recovery for non-time-critical applications
Reverse Recovery Time (trr): Lower values indicate faster switching performance
Current - Reverse Leakage @ Vr: Must not exceed specified maximum at rated voltage

Mechanical Equivalence Criteria:

Package / Case: Must be DO-214AC (SMA) or compatible surface mount package
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must cover or exceed -55°C to 150°C junction temperature range

Compliance Criteria:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
Technology: Standard rectifier diode or Schottky diode (with voltage/current compatibility)

Substitute parts are grouped into three categories:

Direct Equivalents (Same Electrical & Mechanical Specifications): Parts with identical or superior electrical ratings, same package, and Active product status.
Functional Equivalents (Higher Current Rating): Parts with 50 V rating and current ratings ≥ 1 A, suitable for applications where higher current capacity is acceptable.
Alternative Technology (Schottky Diodes): Parts with different technology (Schottky vs. Standard) but compatible voltage/current ratings and package, for applications where lower forward voltage drop is beneficial.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	trr [ns]	Ir @ Vr [µA]	Speed	Package	Temp Range [°C]	Status	Technology
ES1A	onsemi	50	1	920 @ 1A	15	5 @ 50V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-55 to 150	Not For New Designs	Standard
ES1A-E3/5AT	Vishay	50	1	920 @ 1A	25	5 @ 50V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-55 to 155	Active	Standard
S1A	YAGEO	50	1.1	—	—	—	—	DO-214AC (SMA)	—	Active	Standard
CGRA4001-G	Comchip Technology	50	1	1100 @ 1A	—	5 @ 50V	Standard Recovery >500ns	DO-214AC (SMA)	-55 to 150	Active	Standard
MURA105T3G	onsemi	50	2	875 @ 1A	30	2 @ 50V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-65 to 175	Active	Standard
EGF1A-E3/67A	Vishay	50	1	1000 @ 1A	50	5 @ 50V	Fast Recovery ≤ 500ns	DO-214BA (GF1)	-65 to 175	Active	Standard
EGF1A-E3/5CA	Vishay	50	1	1000 @ 1A	50	5 @ 50V	Fast Recovery ≤ 500ns	DO-214BA (GF1)	-65 to 175	Active	Standard
GF1A-E3/67A	Vishay	50	1	1100 @ 1A	2000	5 @ 50V	Standard Recovery >500ns	DO-214BA (GF1)	-65 to 175	Active	Standard
ES1A-LTP	Micro Commercial Co	50	1	950 @ 1A	35	5 @ 50V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-65 to 175	Not For New Designs	Standard
CMSH1-60M BK PBFREE	Central Semiconductor Corp	60	1	700 @ 1A	—	500 @ 60V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-65 to 150	Active	Schottky
CMSH1-60M TR13 PBFREE	Central Semiconductor Corp	60	1	700 @ 1A	—	500 @ 60V	Fast Recovery ≤ 500ns	DO-214AC (SMA)	-65 to 150	Active	Schottky

Engineering Selection Recommendations

Primary Recommendation - Direct Electrical & Mechanical Equivalent:

The ES1A-E3/5AT (Vishay General Semiconductor - Diodes Division) is the preferred substitute for the onsemi ES1A. This part maintains identical electrical specifications (50 V, 1 A, 920 mV forward voltage), operates in the same DO-214AC (SMA) package, and carries Active product status. The reverse recovery time of 25 ns is slightly higher than the original 15 ns but remains within fast recovery classification. Operating temperature range extends to 155°C, providing improved thermal margin. RoHS3 compliance and MSL 1 rating match the original part.

Secondary Recommendation - Higher Current Capacity:

The MURA105T3G (onsemi) provides a 50 V, 2 A rated alternative in the same DO-214AC (SMA) package with Active status. This part is suitable for applications where current headroom is required. Forward voltage of 875 mV is lower than the ES1A, and reverse leakage is reduced to 2 µA. Extended operating temperature range (-65°C to 175°C) and improved reverse recovery time (30 ns) support demanding applications. This part is electrically superior and maintains full compatibility with existing PCB layouts.

Alternative Package Option - DO-214BA (GF1):

The EGF1A-E3/67A (Vishay) offers identical electrical ratings (50 V, 1 A) with Active status but uses the DO-214BA (GF1) package instead of DO-214AC (SMA). This part is suitable only for new designs or PCB revisions that accommodate the different package footprint. Extended temperature range (-65°C to 175°C) and SUPERECTIFIER® series designation indicate enhanced performance characteristics.

Schottky Technology Alternative:

The CMSH1-60M BK PBFREE and CMSH1-60M TR13 PBFREE (Central Semiconductor Corp) are Schottky diodes with 60 V rating and 1 A current capacity in DO-214AC (SMA) package. These parts feature significantly lower forward voltage (700 mV vs. 920 mV), reducing power dissipation in high-frequency switching applications. Higher reverse leakage (500 µA @ 60 V) and different technology require circuit validation. Suitable for applications where lower forward voltage drop is a design requirement.

Not Recommended for New Designs:

The ES1A-LTP (Micro Commercial Co) and GF1A-E3/67A (Vishay) carry "Not For New Designs" status or exhibit significantly degraded performance characteristics (2 µs reverse recovery time). These parts should be used only for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the ES1A-E3/5AT directly replace the onsemi ES1A without PCB modification?

A: Yes. The ES1A-E3/5AT is a direct pin-compatible substitute in the DO-214AC (SMA) package. Electrical specifications are identical, and both parts are RoHS3 compliant with MSL 1 rating. No PCB layout changes are required.

Q: What is the difference between the ES1A and MURA105T3G?

A: The MURA105T3G has double the current rating (2 A vs. 1 A) while maintaining the same 50 V voltage rating and DO-214AC (SMA) package. Forward voltage is slightly lower (875 mV vs. 920 mV), and reverse leakage is reduced (2 µA vs. 5 µA). The MURA105T3G is suitable for applications requiring higher current capacity or lower power dissipation.

Q: Can I use a Schottky diode (CMSH1-60M) instead of the ES1A?

A: Schottky diodes like the CMSH1-60M can substitute the ES1A in applications where lower forward voltage drop is beneficial. However, Schottky diodes exhibit higher reverse leakage current (500 µA vs. 5 µA at rated voltage). Circuit design must account for this difference. The 60 V rating provides additional voltage margin over the 50 V ES1A specification.

Q: Why do some substitute parts have different package designations (DO-214BA vs. DO-214AC)?

A: DO-214AC (SMA) and DO-214BA (GF1) are distinct surface mount packages with different physical footprints and pin configurations. Parts using DO-214BA package (such as EGF1A-E3/67A) require PCB redesign and cannot be used as drop-in replacements. These alternatives are suitable only for new designs or PCB revisions.

Q: What does "Not For New Designs" status mean for the ES1A?

A: This designation indicates the part has reached end-of-life and is no longer recommended for new product development. Existing inventory may remain available, but long-term sourcing is not guaranteed. Active-status alternatives such as ES1A-E3/5AT should be used for new designs to ensure supply continuity.

Q: How do I select between multiple substitute options?

A: Selection depends on application requirements. For direct replacement with no PCB changes, use ES1A-E3/5AT. For applications requiring higher current capacity, use MURA105T3G. For applications requiring lower forward voltage drop, evaluate Schottky alternatives (CMSH1-60M series). For new designs with PCB flexibility, consider EGF1A-E3/67A or EGF1A-E3/5CA for extended temperature range and SUPERECTIFIER® performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original ES1A specifications.

Q: What is the significance of reverse recovery time (trr) differences?

A: Reverse recovery time affects switching speed and switching losses in high-frequency applications. The ES1A has 15 ns trr (fastest). ES1A-E3/5AT has 25 ns, and MURA105T3G has 30 ns. All remain within the "Fast Recovery ≤ 500ns" classification. For applications operating below 1 MHz, trr differences are negligible. For high-frequency switching (>10 MHz), the lower trr of the original ES1A may be preferred, but ES1A-E3/5AT remains acceptable.

Q: Can I use the S1A (YAGEO) as a substitute?

A: The S1A is rated for 50 V and 1.1 A in DO-214AC (SMA) package with Active status. Limited technical data is provided in this reference. Detailed electrical specifications (forward voltage, reverse recovery time, leakage current) are not available. Verification against complete datasheets is required before selection.

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