S3A Equivalent & Substitute Parts

Part Overview

The S3A is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 50 V DC reverse voltage and 3 A average rectified current. The device is packaged in the DO-214AB (SMC) surface mount configuration and is classified as Active product status with ROHS3 compliance. This diode is suitable for standard recovery applications requiring moderate current handling in compact surface mount form factors.

Substitute parts are identified to address supply chain continuity, alternative packaging options, or performance variations while maintaining electrical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 3 A
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V (exact match required)
Current - Average Rectified (Io): 3 A (exact match required for direct substitution)
Package / Case: DO-214AB, SMC (exact match required for mechanical compatibility)
Mounting Type: Surface Mount (required)
RoHS Status: ROHS3 Compliant (required)

Secondary Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 900 mV to 1.15 V @ 3 A
Reverse Recovery Time (trr): Acceptable range 25 ns to 2.5 µs
Current - Reverse Leakage @ Vr: Acceptable range 5 µA to 10 µA @ 50 V
Operating Temperature - Junction: Acceptable range -65°C to -55°C (minimum), 150°C to 175°C (maximum)

Non-Substitutable Variants:

S3AB-13-F: Different package (DO-214AA, SMB) — mechanical incompatibility
S5A-E3/57T: Different current rating (5 A vs. 3 A) — electrical incompatibility

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns/µs]	Ir @ Vr [µA]	Package	Tj (Min-Max) [°C]	RoHS
S3A	SMC Diode Solutions	50	3	1.1 @ 3 A	2.5 µs	5 @ 50 V	DO-214AB, SMC	-65 to 175	ROHS3
ES3A	Taiwan Semiconductor Corporation	50	3	0.95 @ 3 A	35 ns	10 @ 50 V	DO-214AB, SMC	-55 to 150	ROHS3
ES3A-13-F	Diodes Incorporated	50	3	0.9 @ 3 A	25 ns	10 @ 50 V	DO-214AB, SMC	-55 to 150	ROHS3
ES3A-E3/57T	Vishay General Semiconductor - Diodes Division	50	3	0.9 @ 3 A	30 ns	10 @ 50 V	DO-214AB, SMC	-55 to 150	ROHS3
S3A-13-F	Diodes Incorporated	50	3	1.15 @ 3 A	>500 ns	10 @ 50 V	DO-214AB, SMC	-65 to 150	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original S3A component.

Direct Electrical Equivalents (50 V, 3 A, DO-214AB SMC):

ES3A, ES3A-13-F, ES3A-E3/57T, and S3A-13-F are electrically compatible substitutes. These parts satisfy the primary substitution criteria of 50 V reverse voltage, 3 A average rectified current, and DO-214AB SMC packaging.

Performance Differentiation:

ES3A-13-F and ES3A-E3/57T exhibit faster reverse recovery times (25 ns and 30 ns respectively) compared to the S3A (2.5 µs), indicating fast recovery technology. These variants feature lower forward voltage drops (0.9 V) and are suitable for applications where switching speed is advantageous.

S3A-13-F maintains standard recovery characteristics matching the original S3A technology but with slightly elevated forward voltage (1.15 V @ 3 A).

Temperature Range Considerations:

The S3A and S3A-13-F support extended minimum junction temperature (-65°C), while ES3A, ES3A-13-F, and ES3A-E3/57T are rated to -55°C minimum. Selection depends on application-specific low-temperature requirements.

Non-Equivalent Variants:

S3AB-13-F (DO-214AA, SMB package) and S5A-E3/57T (5 A rating) are not direct substitutes due to mechanical and electrical incompatibilities respectively.

Frequently Asked Questions (FAQ)

Q: Can ES3A replace S3A in all applications?

A: ES3A is electrically compatible within the specified parameter ranges (50 V, 3 A, DO-214AB SMC). However, ES3A exhibits faster reverse recovery (35 ns vs. 2.5 µs) and operates to -55°C minimum versus -65°C for S3A. Application-specific thermal and switching requirements determine suitability.

Q: What is the difference between standard recovery and fast recovery variants?

A: Standard recovery diodes (S3A, S3A-13-F) exhibit reverse recovery times exceeding 500 ns. Fast recovery diodes (ES3A, ES3A-13-F, ES3A-E3/57T) demonstrate reverse recovery times of 25–35 ns. Fast recovery variants reduce switching losses in high-frequency applications but are not required for low-frequency rectification.

Q: Are all substitute parts mechanically compatible with S3A?

A: ES3A, ES3A-13-F, ES3A-E3/57T, and S3A-13-F are mechanically compatible, all using DO-214AB (SMC) packaging. S3AB-13-F uses DO-214AA (SMB) packaging and is not mechanically interchangeable.

Q: Why is S5A-E3/57T listed but not recommended as a substitute?

A: S5A-E3/57T is rated for 5 A average rectified current, exceeding the S3A specification of 3 A. This represents a different electrical class and is not a direct substitute, though it may be used in applications requiring higher current capacity.

Q: What packaging options are available for S3A substitutes?

A: All direct electrical substitutes (ES3A, ES3A-13-F, ES3A-E3/57T, S3A-13-F) are supplied in DO-214AB (SMC) surface mount packaging. Packaging variants such as Cut Tape (CT), Digi-Reel®, or Tape & Reel (TR) represent distribution formats rather than mechanical package changes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory compatibility with the original S3A component.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage variations (0.9 V to 1.15 V @ 3 A) result in different voltage drops across the diode during conduction. Applications with tight voltage regulation or high-efficiency requirements should account for these differences in circuit design calculations.

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