RS2A M4G Equivalent & Substitute Parts

Part Overview

The RS2A M4G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The RS2A M4G features fast recovery characteristics with a reverse recovery time of 150 ns, forward voltage of 1.3 V at 2 A, and operates across a junction temperature range of -55°C to 150°C. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) support standard manufacturing environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 2 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	50	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RS2A M4G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AA (SMB) or compatible surface mount package
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Voltage - Forward (Vf): Substitutes may vary within acceptable circuit design margins
Reverse Recovery Time (trr): Fast recovery (≤ 500ns) preferred but standard recovery (> 500ns) acceptable for non-critical applications
Reverse Leakage Current: Acceptable within 5-10 µA @ 50 V range
Capacitance: Variation acceptable based on circuit requirements
Operating Temperature Range: Minimum -55°C to 150°C junction temperature required

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents — Parts with identical or near-identical electrical specifications and the same DO-214AA package.

Category 2: Similar Functional Substitutes — Parts meeting voltage and current requirements with alternative package options (SMA) or different recovery speed characteristics, suitable for applications where package footprint flexibility exists.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Product Status
RS2A M4G	Taiwan Semiconductor Corporation	50	2	1.3 @ 2 A	Fast Recovery ≤ 500ns	150	5 @ 50 V	DO-214AA (SMB)	Discontinued
RS2A	Taiwan Semiconductor Corporation	50	2	1.3 @ 2 A	Fast Recovery ≤ 500ns	150	5 @ 50 V	DO-214AA (SMB)	Active
CGRB201-G	Comchip Technology	50	2	1.1 @ 2 A	Standard Recovery > 500ns	—	5 @ 50 V	DO-214AA (SMB)	Active
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	Fast Recovery ≤ 500ns	25	5 @ 50 V	DO-214AA (SMB)	Active
ES2AA-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	Fast Recovery ≤ 500ns	25	5 @ 50 V	DO-214AC (SMA)	Active
ES2AHE3_A/H	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	Fast Recovery ≤ 500ns	20	10 @ 50 V	DO-214AA (SMB)	Active
ES2AHE3_A/I	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	Fast Recovery ≤ 500ns	20	10 @ 50 V	DO-214AA (SMB)	Active
ES2AHM3/5BT	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	Fast Recovery ≤ 500ns	30	10 @ 50 V	DO-214AA (SMB)	Active
RS2A-13-F	Diodes Incorporated	50	1.5	1.3 @ 1.5 A	Fast Recovery ≤ 500ns	150	5 @ 50 V	DO-214AC (SMA)	Active
RS2A-E3/52T	Vishay General Semiconductor - Diodes Division	50	1.5	1.3 @ 1.5 A	Fast Recovery ≤ 500ns	150	5 @ 50 V	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

The RS2A (base part number, active status) from Taiwan Semiconductor Corporation is the direct parametric equivalent to the discontinued RS2A M4G. This part maintains identical electrical specifications, package configuration, and compliance certifications. Selection of RS2A is appropriate for applications requiring no design modification.

Secondary Equivalents (DO-214AA Package, Active Status):

The following parts are active, meet the 50 V / 2 A specification, and are packaged in DO-214AA (SMB):

CGRB201-G (Comchip Technology): Meets voltage and current requirements with lower forward voltage (1.1 V). Recovery speed is standard (> 500ns) rather than fast recovery. Suitable for applications where switching speed is not critical and lower forward voltage drop is beneficial.
ES2A-13-F (Diodes Incorporated): Meets voltage and current requirements with superior fast recovery characteristics (25 ns trr). Forward voltage is 0.92 V, providing lower conduction losses. Recommended for high-frequency switching applications.
ES2AHE3_A/H and ES2AHE3_A/I (Vishay General Semiconductor - Diodes Division): Both meet voltage and current requirements with automotive-grade qualification (AEC-Q101). Forward voltage is 0.9 V with fast recovery (20 ns trr). Suitable for automotive and mission-critical applications requiring enhanced reliability documentation.
ES2AHM3/5BT (Vishay General Semiconductor - Diodes Division): Meets voltage and current requirements with fast recovery (30 ns trr) and forward voltage of 0.9 V. Suitable for general industrial applications.

Alternative Package Option (SMA Package, Active Status):

ES2AA-13-F (Diodes Incorporated): Meets voltage and current requirements in DO-214AC (SMA) package instead of SMB. Forward voltage is 0.92 V with fast recovery (25 ns trr). Selection appropriate only if circuit board layout accommodates SMA footprint.

Current-Reduced Alternatives (DO-214AA Package, Active Status):

RS2A-13-F (Diodes Incorporated): Rated for 1.5 A average rectified current (reduced from 2 A) in SMA package. Not recommended as direct replacement due to lower current rating and different package.
RS2A-E3/52T (Vishay General Semiconductor - Diodes Division): Rated for 1.5 A average rectified current (reduced from 2 A) in DO-214AA package. Not recommended as direct replacement due to lower current rating.

Compliance and Certification:

All recommended substitute parts maintain RoHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity level, matching the original RS2A M4G specifications. Parts with automotive qualification (ES2AHE3_A/H, ES2AHE3_A/I) provide additional AEC-Q101 documentation for applications requiring automotive-grade component traceability.

Frequently Asked Questions (FAQ)

Q: Can the RS2A (base part) directly replace the RS2A M4G?

A: Yes. The RS2A is the active production equivalent with identical electrical specifications (50 V, 2 A, fast recovery, 150 ns trr, 1.3 V forward voltage) and DO-214AA package. No circuit modification is required.

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

A: Fast recovery diodes have reverse recovery time (trr) of 500 ns or less, enabling operation at higher switching frequencies with reduced switching losses. Standard recovery diodes (trr > 500ns) are suitable for lower-frequency applications. The RS2A M4G specifies fast recovery (150 ns). The CGRB201-G substitute uses standard recovery, acceptable only in applications where switching frequency does not exceed the diode's recovery capability.

Q: Can I use ES2A-13-F as a substitute if my circuit board has SMB footprint?

A: Yes. The ES2A-13-F is packaged in DO-214AA (SMB), matching the RS2A M4G footprint. It meets the 50 V / 2 A specification with superior fast recovery (25 ns trr) and lower forward voltage (0.92 V), making it a performance-enhanced substitute.

Q: Why do some substitutes have lower forward voltage?

A: Forward voltage variation (0.9 V to 1.3 V at 2 A) reflects different semiconductor manufacturing processes and doping profiles. Lower forward voltage reduces conduction losses and heat generation. Substitutes with lower Vf (ES2A series, ES2AHE3 series) are beneficial in high-current or thermally constrained applications.

Q: Can I use ES2AA-13-F if my design uses SMB package?

A: No. The ES2AA-13-F is packaged in DO-214AC (SMA), a different footprint than the SMB package required for RS2A M4G. Circuit board layout modification would be necessary. Use only if design flexibility permits package change.

Q: Are automotive-qualified parts (ES2AHE3_A/H, ES2AHE3_A/I) required for non-automotive applications?

A: No. Automotive qualification (AEC-Q101) provides additional reliability documentation and traceability. For non-automotive applications, standard industrial-grade parts (ES2A-13-F, CGRB201-G) are sufficient. Automotive-qualified parts may be selected for mission-critical applications requiring enhanced qualification documentation.

Q: What is the impact of using CGRB201-G with standard recovery instead of fast recovery?

A: Standard recovery diodes exhibit higher reverse recovery current and longer recovery time, increasing switching losses and heat generation at high frequencies. CGRB201-G is suitable for DC rectification and low-frequency switching (< 100 kHz). For applications requiring the original fast recovery performance, select ES2A-13-F, ES2AHE3 series, or ES2AHM3/5BT.

Q: Why are RS2A-13-F and RS2A-E3/52T listed if they have lower current rating?

A: These parts are listed as reference only. Both are rated for 1.5 A instead of 2 A, making them unsuitable as direct replacements for 2 A applications. They are included to show the full RS2A product family but should not be selected for the RS2A M4G substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original RS2A M4G environmental compliance requirements.

Q: What is the recommended substitute for high-frequency switching applications?

A: ES2A-13-F (Diodes Incorporated) is recommended for high-frequency applications. It provides the fastest reverse recovery time (25 ns) among available substitutes, lowest forward voltage (0.92 V), and maintains the required DO-214AA (SMB) package footprint.

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