Equivalent & Substitute Parts for onsemi S3AB

Part Overview

The onsemi S3AB is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The S3AB is qualified to AEC-Q101 automotive standards and operates across a junction temperature range of -55°C to 150°C. Substitute parts are necessary due to product discontinuation and to provide alternative sourcing options with comparable electrical and mechanical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the onsemi S3AB is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Package / Case: DO-214AA (SMB) surface mount
Operating Temperature - Junction: -55°C to 150°C minimum range
RoHS Status: ROHS3 Compliant
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Current - Average Rectified (Io): Substitute parts rated at 2 A or higher are electrically compatible for applications requiring up to 3 A
Voltage - Forward (Vf): Substitute parts with forward voltage ≤ 1.15 V @ rated current maintain circuit performance
Reverse Recovery Time (trr): Substitute parts with trr ≤ 1.5 µs are compatible; faster recovery (≤ 500 ns) represents improved performance

Substitutes Identified:

Substitute parts meeting all primary criteria with 2 A current rating:

ES2A-E3/52T (Vishay)
ES2A-E3/5BT (Vishay)
ES2A-M3/52T (Vishay)
ES2A-M3/5BT (Vishay)
ES2AHE3_A/H (Vishay, Automotive AEC-Q101)
ES2AHE3_A/I (Vishay, Automotive AEC-Q101)
ES2AHM3/5BT (Vishay)

Substitute parts meeting primary criteria with different package:

ES2AA-13-F (Diodes Incorporated, DO-214AC SMA package)

Substitute parts with reduced current rating (1.5 A):

RS2A-13-F (Diodes Incorporated, DO-214AC SMA package)

Parameter Comparison

Parameter	onsemi S3AB	ES2A-E3/52T	ES2A-E3/5BT	ES2A-M3/52T	ES2A-M3/5BT	ES2AHE3_A/H	ES2AHE3_A/I	ES2AHM3/5BT	ES2A-13-F	ES2AA-13-F	RS2A-13-F
Manufacturer	onsemi	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Diodes Inc.	Diodes Inc.	Diodes Inc.
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	2 A	2 A	2 A	2 A	2 A	2 A	2 A	2 A	2 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	920 mV @ 2 A	900 mV @ 2 A	900 mV @ 2 A	900 mV @ 2 A	900 mV @ 2 A	900 mV @ 2 A	900 mV @ 2 A	920 mV @ 2 A	920 mV @ 2 A	1.3 V @ 1.5 A
Reverse Recovery Time (trr)	1.5 µs	30 ns	30 ns	30 ns	30 ns	20 ns	20 ns	30 ns	25 ns	25 ns	150 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 150°C
Grade	Automotive	—	—	—	—	Automotive	Automotive	—	—	—	—
Qualification	AEC-Q101	—	—	—	—	AEC-Q101	AEC-Q101	—	—	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

For applications requiring automotive qualification and AEC-Q101 compliance, ES2AHE3_A/H and ES2AHE3_A/I are direct functional equivalents. Both maintain the same 50 V reverse voltage rating, DO-214AA SMB package, automotive grade designation, and AEC-Q101 qualification as the onsemi S3AB. These parts operate across the full -55°C to 150°C junction temperature range and are ROHS3 compliant. The primary difference is reduced current rating (2 A versus 3 A), which is acceptable for applications where the circuit design accommodates this lower current specification.

Secondary Substitutes (DO-214AA SMB Package):

ES2A-E3/52T, ES2A-M3/52T, ES2A-M3/5BT, and ES2AHM3/5BT are functionally compatible alternatives in the same DO-214AA SMB package. All maintain 50 V reverse voltage rating and ROHS3 compliance. These parts feature fast recovery characteristics (trr ≤ 30 ns) compared to the S3AB standard recovery (trr = 1.5 µs), resulting in improved switching performance. Operating temperature ranges are -55°C to 150°C, matching the S3AB specification. Current rating is 2 A, requiring circuit design verification for applications originally specified at 3 A.

Alternative Package Options:

ES2AA-13-F (Diodes Incorporated) provides equivalent electrical performance in a DO-214AC SMA package. This part is suitable only for applications where SMA package footprint is acceptable. RS2A-13-F (Diodes Incorporated) offers 50 V reverse voltage in SMA package but with reduced current rating (1.5 A) and extended temperature range (-65°C to 150°C).

Compliance Considerations:

All identified substitutes maintain ROHS3 compliance and are rated for -55°C to 150°C operation (with exception of ES2A-E3/5BT at -50°C minimum). For automotive applications requiring AEC-Q101 qualification, only ES2AHE3_A/H and ES2AHE3_A/I meet this requirement. Non-automotive substitute parts are suitable for industrial and commercial applications where automotive qualification is not mandated.

Frequently Asked Questions (FAQ)

Q: Can ES2A-E3/52T directly replace the onsemi S3AB in all applications?

A: ES2A-E3/52T is electrically compatible for applications where 2 A average rectified current is sufficient. The part maintains identical 50 V reverse voltage rating, DO-214AA SMB package, and operating temperature range (-55°C to 150°C). However, if the original circuit design requires 3 A current capacity, this substitute is not suitable. The faster reverse recovery time (30 ns versus 1.5 µs) represents improved performance and does not create compatibility issues.

Q: What is the difference between ES2AHE3_A/H and ES2AHE3_A/I?

A: Both parts are electrically identical with identical specifications: 50 V reverse voltage, 2 A current rating, 20 ns reverse recovery time, DO-214AA SMB package, automotive grade, and AEC-Q101 qualification. The difference is in the tape and reel packaging designation (H versus I suffix), which relates to supplier packaging format. Either part is functionally equivalent for circuit design purposes.

Q: Why do some substitutes have faster reverse recovery times than the S3AB?

A: Reverse recovery time (trr) indicates the speed at which a diode transitions from conducting to blocking state. The S3AB has standard recovery (trr = 1.5 µs), while most ES2A variants have fast recovery (trr ≤ 30 ns). Faster recovery reduces switching losses and improves efficiency in high-frequency applications. This difference does not prevent substitution; circuits designed for standard recovery diodes operate correctly with fast recovery alternatives.

Q: Can I use RS2A-13-F as a substitute if my application only requires 1.5 A?

A: RS2A-13-F is compatible for applications rated at 1.5 A or lower. This part maintains 50 V reverse voltage and ROHS3 compliance. However, the package is DO-214AC SMA, not DO-214AA SMB, requiring PCB layout modification. Additionally, RS2A-13-F is not automotive qualified, making it unsuitable for applications requiring AEC-Q101 certification.

Q: What is the significance of the DO-214AA SMB versus DO-214AC SMA package difference?

A: DO-214AA (SMB) and DO-214AC (SMA) are different surface mount diode packages with different physical dimensions and PCB footprints. SMB packages are larger than SMA packages. Substituting between these packages requires PCB redesign and is not a direct replacement. Parts with identical DO-214AA SMB package designation (ES2A-E3/52T, ES2A-M3/52T, ES2AHE3_A/H, ES2AHE3_A/I, ES2AHM3/5BT) are direct mechanical replacements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (ES2A series from Vishay and ES2A/RS2A series from Diodes Incorporated) are ROHS3 compliant, matching the onsemi S3AB compliance status. This ensures compatibility with environmental and regulatory requirements.

Q: Which substitute is best for automotive applications?

A: ES2AHE3_A/H and ES2AHE3_A/I are the only substitutes carrying automotive grade designation and AEC-Q101 qualification, matching the S3AB. Both maintain identical operating temperature range (-55°C to 150°C) and package format (DO-214AA SMB). These parts are specified for automotive circuit applications where qualification standards are mandatory.

Q: What happens if I use a 2 A rated substitute in a circuit designed for 3 A?

A: Using a 2 A rated diode in a 3 A circuit creates risk of thermal stress and potential component failure. The diode would operate above its rated current specification, generating excessive heat and reducing reliability. Substitution to lower-current parts is only acceptable when circuit design is verified to operate within the substitute part's current rating.

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