ES3A Equivalent & Substitute Parts Reference

Part Overview

The ES3A is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMC (DO-214AB) package. This diode features fast recovery characteristics with a reverse recovery time of 35 nanoseconds and operates across a junction temperature range of -55°C to 150°C.

The ES3A from SMC Diode Solutions is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	45	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ES3A is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 3 A
Reverse Recovery Time (trr): 35 ns
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 950 mV @ 3 A (all substitutes match)
Current - Reverse Leakage @ Vr: 1–10 µA @ 50 V (within acceptable range)
Operating Temperature - Junction: -55°C to -65°C minimum; 150°C maximum (all substitutes meet or exceed)
Capacitance @ Vr, F: 45 pF @ 4V, 1MHz (all substitutes match)

Substitute parts are grouped into two categories: direct manufacturer equivalents from SMC Diode Solutions and parametric equivalents from alternative manufacturers (Panjit International Inc. and Taiwan Semiconductor Corporation).

Parameter Comparison

Parameter	ES3A (SMC)	ER3A (SMC)	ER3A_R1_00001 (Panjit)	ES3A (Taiwan Semi)	ES3AH (Taiwan Semi)
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V
Capacitance @ Vr, F	45 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Standard	Standard	Standard	Standard	Automotive (AEC-Q101)

Engineering Selection Recommendations

Primary Substitute: ER3A (SMC Diode Solutions)

The ER3A from SMC Diode Solutions is the direct manufacturer equivalent. It maintains identical electrical specifications to the ES3A across all critical parameters: 50 V reverse voltage, 3 A average rectified current, 35 ns reverse recovery time, and DO-214AB SMC package. The ER3A is currently in active product status with 3225 units in stock. It features an extended minimum operating temperature of -65°C compared to the ES3A's -55°C, providing enhanced low-temperature performance. The ER3A is ROHS3 compliant and REACH affected.

Secondary Substitute: ER3A_R1_00001 (Panjit International Inc.)

The ER3A_R1_00001 from Panjit International Inc. is a parametric equivalent offering identical electrical performance across all critical parameters. This part is active in production with 1118 units in stock. It features superior reverse leakage characteristics at 1 µA @ 50 V compared to the ES3A's 5 µA, resulting in lower leakage current. The ER3A_R1_00001 is ROHS3 compliant and REACH unaffected. Operating temperature range matches the ES3A at -55°C to 150°C.

Tertiary Substitute: ES3A (Taiwan Semiconductor Corporation)

The ES3A from Taiwan Semiconductor Corporation is a parametric equivalent with identical part number designation but different manufacturer. All critical electrical parameters match the original ES3A: 50 V reverse voltage, 3 A average rectified current, 35 ns reverse recovery time, and DO-214AB package. This part is active in production with 17100 units in stock. Reverse leakage is specified at 10 µA @ 50 V, which is within acceptable variation. The part is ROHS3 compliant and REACH unaffected.

Automotive-Grade Substitute: ES3AH (Taiwan Semiconductor Corporation)

The ES3AH from Taiwan Semiconductor Corporation is an automotive-grade variant qualified to AEC-Q101 standard. It maintains identical electrical specifications to the ES3A across all critical parameters. This part is active in production with 956 units in stock. The ES3AH is suitable for applications requiring automotive qualification and reliability standards. It is ROHS3 compliant and REACH unaffected.

Selection Basis:

For direct manufacturer continuity: Select ER3A (SMC Diode Solutions)
For lowest reverse leakage: Select ER3A_R1_00001 (Panjit International Inc.)
For maximum inventory availability: Select ES3A (Taiwan Semiconductor Corporation)
For automotive applications: Select ES3AH (Taiwan Semiconductor Corporation)

All substitute parts are surface mount components in DO-214AB SMC package format, compatible with existing PCB layouts and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ER3A replace the obsolete ES3A in existing designs?

A: Yes. The ER3A from SMC Diode Solutions is a direct manufacturer equivalent with identical electrical specifications, package format, and mounting type. All critical parameters—reverse voltage, average rectified current, reverse recovery time, and thermal characteristics—are equivalent.

Q: What is the difference between the ES3A from SMC and the ES3A from Taiwan Semiconductor Corporation?

A: Both parts share the same part number designation and meet identical electrical specifications for reverse voltage (50 V), average rectified current (3 A), and reverse recovery time (35 ns). The primary difference is manufacturer. The Taiwan Semiconductor version specifies reverse leakage at 10 µA @ 50 V compared to SMC's 5 µA, which remains within acceptable operating parameters. The Taiwan Semiconductor version is currently in active production with higher inventory availability.

Q: Is the ER3A_R1_00001 from Panjit suitable for direct substitution?

A: Yes. The ER3A_R1_00001 is a parametric equivalent meeting all critical electrical requirements. It offers superior reverse leakage performance at 1 µA @ 50 V. The part is surface mount in DO-214AB SMC package, compatible with existing PCB designs and assembly equipment.

Q: What is the significance of the ES3AH automotive qualification?

A: The ES3AH carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and quality standards. This qualification is required for applications in automotive systems. The ES3AH maintains identical electrical specifications to the standard ES3A while meeting additional automotive industry requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed—ER3A, ER3A_R1_00001, ES3A (Taiwan Semiconductor), and ES3AH—are ROHS3 compliant, meeting current environmental and hazardous substance restrictions.

Q: Can these diodes be used interchangeably in the same circuit?

A: Yes, within the specified electrical and thermal operating ranges. All substitute parts maintain identical reverse voltage (50 V), average rectified current (3 A), forward voltage drop (950 mV @ 3 A), and reverse recovery time (35 ns). Reverse leakage variation (1–10 µA @ 50 V) is acceptable for general-purpose rectification applications. Operating temperature ranges are equivalent or superior across all substitutes.

Q: What packaging format do these diodes use?

A: All parts use Surface Mount technology in DO-214AB SMC package format. This package is compatible with standard surface mount assembly processes and existing PCB layouts designed for SMC diodes.

Q: Which substitute offers the best inventory availability?

A: The ES3A from Taiwan Semiconductor Corporation offers the highest inventory availability with 17100 units in stock, followed by the ER3A from SMC Diode Solutions with 3225 units.

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