Equivalent & Substitute Parts for S2M/54

Part Overview

The S2M/54 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage and 1.5 A average rectified current in a DO-214AA (SMB) surface mount package. This diode is classified as Active product status and utilizes standard recovery technology with a reverse recovery time of 2 µs. The S2M/54 is RoHS non-compliant, which may necessitate identification of compliant alternatives for applications requiring regulatory adherence or long-term supply chain stability.

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 @ 1.5 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 1000 V
Capacitance @ Vr, F	16	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the S2M/54 are grouped into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 1000 V reverse voltage, 1.5 A average rectified current, 1.15 V forward voltage at 1.5 A, 2 µs reverse recovery time, 1 µA reverse leakage current, and DO-214AA (SMB) package. These parts differ only in packaging format (Cut Tape or Tape & Reel) and regulatory compliance status (RoHS3 Compliant vs. RoHS non-compliant). Parametric equivalents include S2M-E3/52T, S2M-E3/5BT, S2MHE3_A/H, and S2MHE3_A/I.

Manufacturer Recommended Alternatives deviate from one or more electrical parameters while maintaining the same base product number (S2M) and package family. These alternatives are suitable when application requirements permit relaxation of specific electrical constraints. Deviations include higher current ratings (2 A vs. 1.5 A), different package variants (SMA vs. SMB), lower reverse voltage (800 V vs. 1000 V), or different recovery speed classifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs]	Ir @ Vr [µA]	Package	RoHS Status	Inventory [Pcs]
S2M/54	Vishay	1000	1.5	1.15 @ 1.5 A	2	1 @ 1000 V	DO-214AA (SMB)	Non-compliant	933
S2M-E3/52T	Vishay	1000	1.5	1.15 @ 1.5 A	2	1 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	31800
S2M-E3/5BT	Vishay	1000	1.5	1.15 @ 1.5 A	2	1 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	26000
S2MHE3_A/H	Vishay	1000	1.5	1.15 @ 1.5 A	2	1 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	36600
S2MHE3_A/I	Vishay	1000	1.5	1.15 @ 1.5 A	2	1 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	6807
S2M	MDD	1000	2	1.15 @ 2 A	—	—	SOD-214AC (SMA)	ROHS3 Compliant	325963
S2M-13-F	Diodes Incorporated	1000	1.5	1.15 @ 1.5 A	—	5 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	20300
S2M-LTP	Micro Commercial Co	1000	2	1.15 @ 2 A	≤ 0.5	5 @ 1000 V	DO-214AA (SMB)	ROHS3 Compliant	2606
STTH208U	STMicroelectronics	800	2	1.65 @ 2 A	≤ 0.5	5 @ 800 V	DO-214AA (SMB)	ROHS3 Compliant	20300

Engineering Selection Recommendations

Direct Parametric Equivalents (Preferred for Pin-Compatible Replacement)

The parts S2M-E3/52T, S2M-E3/5BT, S2MHE3_A/H, and S2MHE3_A/I are direct electrical and mechanical equivalents to the S2M/54. All four maintain identical voltage, current, and recovery characteristics while offering RoHS3 compliance. Selection among these four depends on packaging format and application grade requirements:

S2M-E3/52T (Cut Tape packaging) and S2M-E3/5BT (Tape & Reel packaging) are standard-grade industrial diodes with highest inventory availability (31,800 and 26,000 units respectively).
S2MHE3_A/H and S2MHE3_A/I carry AEC-Q101 automotive qualification and are suitable for automotive and high-reliability applications. S2MHE3_A/H offers higher inventory (36,600 units) compared to S2MHE3_A/I (6,807 units).

Manufacturer Recommended Alternatives (For Applications Permitting Parameter Relaxation)

When application requirements allow deviation from the original S2M/54 specifications, the following alternatives provide enhanced performance or supply chain advantages:

S2M-13-F (Diodes Incorporated) maintains 1000 V / 1.5 A ratings with identical forward voltage but exhibits higher reverse leakage (5 µA vs. 1 µA). This part is suitable for applications where leakage current tolerance is not critical.
S2M-LTP (Micro Commercial Co) upgrades current rating to 2 A and implements fast recovery technology (≤ 0.5 µs vs. 2 µs standard recovery). This part is appropriate for higher-current applications or circuits requiring reduced switching losses.
S2M (MDD) provides 2 A current rating in SMA package (SOD-214AC) with RoHS3 compliance and exceptional inventory (325,963 units). This alternative is suitable when package footprint change is acceptable and higher current capacity is beneficial.
STTH208U (STMicroelectronics) offers fast recovery (≤ 0.5 µs) and 2 A rating but operates at reduced reverse voltage (800 V vs. 1000 V). This part is suitable only for applications where 800 V reverse voltage margin is sufficient.

Frequently Asked Questions (FAQ)

Q: Can S2M-E3/52T, S2M-E3/5BT, S2MHE3_A/H, or S2MHE3_A/I be used as direct replacements for S2M/54?

A: Yes. These four parts are parametric equivalents with identical electrical specifications (1000 V, 1.5 A, 1.15 V forward voltage, 2 µs recovery time, 1 µA leakage) and the same DO-214AA (SMB) package. The only differences are packaging format (Cut Tape vs. Tape & Reel) and regulatory compliance (all are RoHS3 Compliant). No circuit modifications are required.

Q: What is the difference between S2MHE3_A/H and S2MHE3_A/I?

A: Both parts are electrically and mechanically identical with AEC-Q101 automotive qualification. The difference is inventory availability: S2MHE3_A/H has 36,600 units in stock, while S2MHE3_A/I has 6,807 units. Selection should be based on supply chain requirements and lead time considerations.

Q: Can S2M-LTP be used in place of S2M/54?

A: S2M-LTP is electrically compatible for voltage (1000 V) and forward voltage (1.15 V @ 2 A) but differs in three parameters: higher current rating (2 A vs. 1.5 A), faster recovery time (≤ 0.5 µs vs. 2 µs), and higher reverse leakage (5 µA vs. 1 µA). It is suitable for applications where these differences are acceptable or beneficial. The DO-214AA (SMB) package is identical.

Q: Why is STTH208U listed as an alternative if it has lower reverse voltage (800 V vs. 1000 V)?

A: STTH208U is included as a manufacturer-recommended alternative for applications where 800 V reverse voltage provides sufficient margin. It offers advantages in current rating (2 A), fast recovery (≤ 0.5 µs), and supply availability (20,300 units). This part should be selected only when the application circuit design confirms that 800 V reverse voltage is adequate.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are packaging and delivery formats that do not affect electrical or mechanical performance. Cut Tape (S2M-E3/52T) is suitable for lower-volume orders and manual assembly. Tape & Reel (S2M-E3/5BT, S2MHE3_A/H, S2MHE3_A/I) is optimized for high-volume automated assembly. Both formats use the same DO-214AA (SMB) component package.

Q: Is the S2M/54 RoHS non-compliance a critical factor in selecting a substitute?

A: RoHS compliance status depends on application requirements and regulatory jurisdiction. If the application is subject to RoHS regulations or requires long-term supply chain stability, all four parametric equivalents (S2M-E3/52T, S2M-E3/5BT, S2MHE3_A/H, S2MHE3_A/I) are RoHS3 Compliant and are recommended. If RoHS compliance is not required, the S2M/54 remains a valid choice based on availability and cost.

Q: Can S2M (MDD) in SMA package be used instead of S2M/54 in SMB package?

A: S2M (MDD) is electrically compatible (1000 V, 2 A, 1.15 V forward voltage) but uses a different package: SOD-214AC (SMA) instead of DO-214AA (SMB). The SMA package has a different footprint and pin configuration. This part can be used only if the PCB layout is redesigned to accommodate the SMA package. It is not a direct pin-compatible replacement.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification (S2MHE3_A/H and S2MHE3_A/I) have undergone additional testing and reliability validation for automotive applications. These parts are suitable for automotive and high-reliability applications where enhanced quality assurance is required.

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