S2MA-13 Equivalent & Substitute Parts

Part Overview

The S2MA-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 1000 V DC reverse voltage and 1.5 A average rectified current in a surface mount SMA (DO-214AC) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within the same application category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AC, SMA	-
Operating Temperature - Junction	-65°C ~ 150°C	-

Substitute Part Grouping Explanation

Substitution of the S2MA-13 is determined by the following critical parameters: voltage rating (1000 V minimum), current rating (1.5 A nominal), package type (DO-214AC/SMA surface mount), and technology classification (standard or avalanche recovery). Parts are grouped into two categories:

Parametric Equivalents: Parts with identical voltage, current, and package specifications. These maintain full functional compatibility with the original design.

Functional Substitutes: Parts with the same voltage and package but reduced current ratings (1.0 A), or parts with enhanced recovery characteristics (avalanche technology) that provide superior performance in specific circuit topologies while maintaining voltage and package compatibility.

The following parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Current - Average Rectified (Io): 1.5 A (equivalents) or 1.0 A (reduced-current substitutes)

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Technology	Speed	Package	Product Status	RoHS Status
S2MA-13	Diodes Incorporated	1000 V	1.5 A	1.15 V @ 1.5 A	Standard	Standard Recovery >500ns	DO-214AC, SMA	Discontinued	RoHS non-compliant
S2MA-13-F	Diodes Incorporated	1000 V	1.5 A	1.15 V @ 1.5 A	Standard	Standard Recovery >500ns	DO-214AC, SMA	Active	ROHS3 Compliant
S2MA	Taiwan Semiconductor Corporation	1000 V	1.5 A	1.1 V @ 1.5 A	Standard	Standard Recovery >500ns	DO-214AC, SMA	Active	ROHS3 Compliant
BYG21M-E3/TR3	Vishay General Semiconductor - Diodes Division	1000 V	1.5 A	1.6 V @ 1.5 A	Avalanche	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant
BYG23M-E3/TR	Vishay General Semiconductor - Diodes Division	1000 V	1.5 A	1.7 V @ 1 A	Avalanche	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant
BYG23M-E3/TR3	Vishay General Semiconductor - Diodes Division	1000 V	1.5 A	1.7 V @ 1 A	Avalanche	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant
RS1M	EVVO Semi	1000 V	1 A	1.3 V @ 1 A	Standard	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant
STTH110A	STMicroelectronics	1000 V	1 A	1.7 V @ 1 A	Standard	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant
STTH108A	STMicroelectronics	800 V	1 A	1.65 V @ 1 A	Standard	Fast Recovery ≤ 500ns	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

S2MA-13-F is the direct parametric equivalent to S2MA-13, providing identical electrical specifications (1000 V, 1.5 A, 1.15 V forward voltage) in the same DO-214AC/SMA package. This part is manufactured by Diodes Incorporated, the original manufacturer, and is currently active with ROHS3 compliance. This selection eliminates design re-qualification requirements.

Alternative Equivalent:

S2MA (Taiwan Semiconductor Corporation) provides equivalent voltage and current ratings with marginally lower forward voltage (1.1 V @ 1.5 A) and is actively produced with ROHS3 compliance. This part maintains full functional compatibility with the original design.

Avalanche Technology Substitutes:

BYG21M-E3/TR3, BYG23M-E3/TR, and BYG23M-E3/TR3 (Vishay) are avalanche-type diodes rated for 1000 V and 1.5 A. These parts feature fast recovery characteristics (≤ 500 ns) compared to the standard recovery of the original part. Avalanche technology provides superior transient suppression and is suitable for applications requiring enhanced overvoltage protection. All three variants are ROHS3 compliant and actively produced.

Reduced-Current Substitutes:

RS1M (EVVO Semi) and STTH110A (STMicroelectronics) are rated for 1000 V at 1.0 A, representing a 33% reduction in current capacity. These parts are suitable only for applications where the circuit current requirement does not exceed 1.0 A. Both are ROHS3 compliant and actively produced.

Not Recommended:

STTH108A (STMicroelectronics) is rated for 800 V maximum reverse voltage, which is below the 1000 V specification of the original part. This part does not meet the voltage requirement and is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can S2MA-13-F be used as a direct replacement for S2MA-13?

A: Yes. S2MA-13-F is a parametric equivalent with identical voltage (1000 V), current (1.5 A), forward voltage (1.15 V @ 1.5 A), and package specifications (DO-214AC/SMA). The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

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

A: Recovery speed refers to the time required for a diode to transition from forward conduction to reverse blocking. Standard recovery diodes (>500 ns) are suitable for general-purpose rectification and power supply applications. Fast recovery diodes (≤ 500 ns) reduce switching losses and are preferred in high-frequency switching applications and inverter circuits. The S2MA-13 uses standard recovery; fast recovery substitutes are compatible but provide enhanced performance in specific topologies.

Q: Can avalanche diodes replace standard recovery diodes?

A: Avalanche diodes (BYG21M-E3/TR3, BYG23M-E3/TR, BYG23M-E3/TR3) are functionally compatible with standard recovery diodes when voltage and current ratings match. Avalanche technology provides superior transient overvoltage suppression through controlled breakdown characteristics. These parts are suitable for applications requiring enhanced protection against voltage spikes. Forward voltage may be slightly elevated (1.6–1.7 V vs. 1.15 V), which should be verified in thermal and efficiency calculations.

Q: Why is STTH108A not recommended as a substitute?

A: STTH108A is rated for 800 V maximum reverse voltage, which is 200 V below the 1000 V requirement of the S2MA-13. Using an 800 V diode in a 1000 V circuit creates risk of reverse breakdown and component failure. This part does not meet the electrical specification and is not suitable for substitution.

Q: Can reduced-current parts (RS1M, STTH110A) be used in place of S2MA-13?

A: Reduced-current substitutes are compatible only if the circuit current requirement does not exceed 1.0 A. The S2MA-13 is rated for 1.5 A; RS1M and STTH110A are rated for 1.0 A. If the actual circuit current is below 1.0 A, these parts are acceptable. If circuit current exceeds 1.0 A, these parts will exceed their current rating and are not suitable.

Q: Are all substitute parts RoHS compliant?

A: S2MA-13-F, S2MA, BYG21M-E3/TR3, BYG23M-E3/TR, BYG23M-E3/TR3, RS1M, STTH110A, and STTH108A are all ROHS3 compliant. The original S2MA-13 is RoHS non-compliant. Compliance status should be verified against your procurement and regulatory requirements.

Q: What is the difference between S2MA and S2MA-13?

A: S2MA-13 and S2MA are both general-purpose 1000 V, 1.5 A rectifier diodes in DO-214AC/SMA packages. The primary differences are manufacturer (Diodes Incorporated vs. Taiwan Semiconductor Corporation) and forward voltage specification (1.15 V vs. 1.1 V @ 1.5 A). Both are functionally equivalent and interchangeable in circuit design.

Q: Can I use BYG23M-E3/TR and BYG23M-E3/TR3 interchangeably?

A: Yes. BYG23M-E3/TR and BYG23M-E3/TR3 are identical in electrical specifications and package type. The difference is packaging format: BYG23M-E3/TR is supplied in Cut Tape (CT) & Digi-Reel format, while BYG23M-E3/TR3 is also supplied in Cut Tape (CT) & Digi-Reel format. Both are suitable for automated assembly and are electrically interchangeable.

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