S2A-LTP Equivalent & Substitute Parts

Part Overview

The S2A-LTP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent and substitute parts are necessary to support existing applications, provide design flexibility, and ensure supply chain continuity for production environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A-LTP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (or compatible subset)

Current Rating Considerations:

Primary equivalent: 2 A average rectified current
Acceptable substitutes: Parts rated at 2 A or higher (3 A acceptable for uprating)
Not acceptable: Parts rated below 2 A

Forward Voltage Characteristics:

Primary specification: 1.15 V @ 2 A
Acceptable tolerance: Forward voltage specifications within standard rectifier diode parameters

Recovery Speed:

Primary specification: Standard Recovery >500ns, > 200mA (Io)
Acceptable substitutes: Standard or Fast Recovery types

Compliance Requirements:

RoHS3 Compliant (mandatory)
REACH Unaffected or REACH info available (acceptable)

Parameter Comparison

Parameter	S2A-LTP (Micro Commercial Co)	ES3AB-13-F (Diodes Inc)	S2AHE3_A/H (Vishay)	S2A (Diotec)	S2A R5G (Taiwan Semi)
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	2 A	3 A	1.5 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	900 mV @ 3 A	1.15 V @ 1.5 A	1.15 V @ 2 A	1.15 V @ 2 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 50 V	10 µA @ 50 V	1 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-50 to 150 °C	-55 to 150 °C
Product Status	Not For New Designs	Active	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement): The S2A (Diotec Semiconductor) is the primary parametric equivalent to the S2A-LTP. This part maintains identical electrical specifications: 50 V reverse voltage, 2 A average rectified current, 1.15 V forward voltage at 2 A, and standard recovery speed characteristics. The Diotec S2A is actively manufactured, ROHS3 compliant, and available in high inventory (7004 pcs). The operating temperature range (-50°C to 150°C) is compatible with the original specification.

Secondary Equivalent (Uprated Current): The ES3AB-13-F (Diodes Incorporated) is a parametric equivalent with uprated current capacity (3 A vs. 2 A). This part meets all voltage and package requirements and is actively manufactured with extensive inventory (19310 pcs). The forward voltage is lower (900 mV @ 3 A), indicating improved efficiency characteristics. Fast recovery speed (≤ 500ns) is compatible with standard recovery applications. This part is suitable for applications where higher current margin is beneficial.

Automotive-Grade Alternative: The S2AHE3_A/H (Vishay General Semiconductor - Diodes Division) is an automotive-qualified alternative (AEC-Q101) with identical package and voltage specifications. Current rating is lower (1.5 A), making this suitable only for applications with reduced current requirements. This part is actively manufactured and ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Discontinued Alternative: The S2A R5G (Taiwan Semiconductor Corporation) is a parametric equivalent with identical electrical specifications to the S2A-LTP. However, this part is discontinued at DiGi Electronics and should not be selected for new production unless existing inventory is available and supply continuity is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the ES3AB-13-F (3 A) be used as a direct replacement for the S2A-LTP (2 A)?

A: Yes. The ES3AB-13-F meets all mandatory substitution criteria: 50 V reverse voltage, DO-214AA SMB package, surface mount configuration, and -55°C to 150°C operating temperature range. The higher current rating (3 A) provides additional design margin and does not create compatibility issues in circuits designed for 2 A operation. The lower forward voltage (900 mV @ 3 A) indicates superior performance characteristics.

Q: What is the difference between Standard Recovery and Fast Recovery speed classifications?

A: Standard Recovery (>500ns) and Fast Recovery (≤ 500ns) refer to reverse recovery time. Fast Recovery diodes switch off more quickly, reducing switching losses and electromagnetic interference. Standard Recovery diodes are suitable for linear power supply and general rectification applications. Fast Recovery diodes are preferred in switching power supplies. The ES3AB-13-F (Fast Recovery) is compatible with applications designed for Standard Recovery diodes.

Q: Is the S2AHE3_A/H suitable as a replacement if my circuit requires 2 A operation?

A: No. The S2AHE3_A/H is rated for 1.5 A average rectified current, which is below the 2 A requirement of the S2A-LTP. Using an underrated component creates risk of thermal stress and reduced component life. This part is suitable only for applications with maximum current requirements of 1.5 A or lower.

Q: Why is the Diotec S2A listed twice in the substitute parts list?

A: The duplicate entry represents the same part from the same manufacturer. Both entries contain identical electrical specifications and availability information. Either entry can be used for component selection purposes.

Q: Can I use the S2A R5G as a replacement if I have existing inventory?

A: The S2A R5G is a parametric equivalent with identical electrical specifications to the S2A-LTP. However, this part is discontinued at DiGi Electronics, indicating limited future availability. Use of existing inventory is acceptable for current production runs, but long-term supply continuity cannot be assured. The Diotec S2A or ES3AB-13-F are recommended for ongoing production to ensure supply chain stability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (ES3AB-13-F, S2AHE3_A/H, S2A Diotec, and S2A R5G) are ROHS3 compliant, matching the compliance status of the original S2A-LTP.

Q: What is the significance of the "Not For New Designs" status of the S2A-LTP?

A: "Not For New Designs" indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory may be available for legacy product support, but new designs should incorporate one of the active substitute parts listed in this reference.

Q: Does the operating temperature range difference between Diotec S2A (-50°C to 150°C) and S2A-LTP (-55°C to 150°C) affect substitution?

A: The Diotec S2A has a slightly narrower lower temperature limit (-50°C vs. -55°C). This is acceptable for most industrial and commercial applications. Applications requiring operation below -50°C should use the ES3AB-13-F, S2AHE3_A/H, or S2A R5G, which all support -55°C minimum junction temperature.

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