Equivalent & Substitute Parts for S2K-M3/5BT

Part Overview

The S2K-M3/5BT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 800 V DC reverse voltage with 1.5 A average rectified current in a DO-214AA (SMB) package. The part is Active status and ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives with equivalent or enhanced electrical characteristics.

Key Parameters

Parameter	S2K-M3/5BT Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A
Reverse Recovery Time (trr)	2 µs
Current - Reverse Leakage @ Vr	1 µA @ 800 V
Capacitance @ Vr, F	16 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the S2K-M3/5BT are categorized based on electrical parameter compatibility and packaging format. The primary substitution criteria are:

Parametric Equivalents maintain identical electrical specifications: 800 V reverse voltage, 1.5 A average rectified current, 1.15 V forward voltage at rated current, and DO-214AA (SMB) package format. These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Alternatives include parts with modified electrical parameters that remain within acceptable application ranges. These may feature higher voltage ratings (1000 V), higher current ratings (2 A or 3 A), different package formats (SMA vs. SMB), or enhanced recovery characteristics. Selection depends on circuit tolerance for parameter variation.

The following key parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) rating must equal or exceed 800 V
Current - Average Rectified (Io) must equal or exceed 1.5 A
Package format compatibility with PCB layout
Forward voltage characteristics within acceptable circuit operating margins
Operating temperature range coverage of -55°C to 150°C

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Status
S2K-M3/5BT	Vishay	800 V	1.5 A	1.15 V @ 1.5 A	2 µs	1 µA @ 800 V	DO-214AA (SMB)	Active
S2K-E3/52T	Vishay	800 V	1.5 A	1.15 V @ 1.5 A	2 µs	1 µA @ 800 V	DO-214AA (SMB)	Active
S2KHE3_A/H	Vishay	800 V	1.5 A	1.15 V @ 1.5 A	2 µs	1 µA @ 800 V	DO-214AA (SMB)	Active
S1K	YAGEO	800 V	Not specified	Not specified	Not specified	Not specified	DO-214AC	Active
S1M	EVVO Semi	1000 V	1 A	1.1 V @ 1 A	Not specified	5 µA @ 1 kV	DO-214AC (SMA)	Active
S2K	Diotec Semiconductor	800 V	2 A	1.15 V @ 2 A	1.5 µs	5 µA @ 800 V	DO-214AA (SMB)	Active
S2M	MDD	1000 V	2 A	1.15 V @ 2 A	Not specified	Not specified	SOD-214AC (SMA)	Active
S2M-LTP	Micro Commercial Co	1000 V	2 A	1.15 V @ 2 A	≤ 500 ns	5 µA @ 1000 V	DO-214AA (SMB)	Active
S3KB	Taiwan Semiconductor Corporation	800 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AA (SMB)	Active
S3KB-TP	Micro Commercial Co	800 V	3 A	1.15 V @ 3 A	Not specified	10 µA @ 800 V	DO-214AA (SMB)	Active
S3MB	MDD	1000 V	3 A	1.1 V @ 3 A	Not specified	5 µA @ 1000 V	SOD-214AA (SMB)	Active

Engineering Selection Recommendations

Direct Parametric Equivalents

S2K-E3/52T and S2KHE3_A/H are parametric equivalents to S2K-M3/5BT with identical electrical specifications. S2K-E3/52T differs only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). S2KHE3_A/H includes automotive-grade qualification (AEC-Q101) and is suitable for applications requiring automotive component standards. Both maintain the same voltage, current, forward voltage, and recovery characteristics as the primary part.

Same Voltage, Higher Current Rating

S2K (Diotec Semiconductor) maintains 800 V reverse voltage with increased 2 A current rating. This part is suitable when circuit design allows for higher current capacity without modification. The reduced reverse recovery time (1.5 µs versus 2 µs) provides improved switching performance.

S3KB and S3KB-TP maintain 800 V reverse voltage with 3 A current rating. These parts accommodate applications requiring higher current handling while preserving the same voltage class and package format.

Higher Voltage Rating, Higher Current Rating

S2M-LTP (Micro Commercial Co) provides 1000 V reverse voltage with 2 A current rating in DO-214AA (SMB) package. This part features fast recovery characteristics (≤ 500 ns) and is suitable for applications requiring enhanced voltage margin or improved switching speed.

S3MB (MDD) provides 1000 V reverse voltage with 3 A current rating. This part accommodates applications requiring both voltage and current margin above the primary specification.

Alternative Package Formats

S1M (EVVO Semi) provides 1000 V reverse voltage with 1 A current rating in SMA package format. This part is suitable only when circuit layout accommodates SMA package dimensions and when the reduced 1 A current rating meets application requirements.

S2M (MDD) provides 1000 V reverse voltage with 2 A current rating in SMA package format.

Compliance and Availability

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). All parts are Active status. S2KHE3_A/H includes AEC-Q101 automotive qualification for applications requiring automotive component certification.

Frequently Asked Questions (FAQ)

Q: Can S2K-E3/52T replace S2K-M3/5BT directly in the circuit?

A: Yes. S2K-E3/52T is a parametric equivalent with identical electrical specifications (800 V, 1.5 A, 1.15 V forward voltage, 2 µs recovery time). The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Circuit performance is identical.

Q: What is the difference between S2KHE3_A/H and S2K-M3/5BT?

A: Electrical specifications are identical. S2KHE3_A/H includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Use S2KHE3_A/H when automotive component certification is required.

Q: Can I use S2K (Diotec) as a substitute for S2K-M3/5BT?

A: S2K (Diotec) maintains 800 V reverse voltage but increases current rating to 2 A. This part is suitable if circuit design tolerates higher current capacity. The reduced reverse recovery time (1.5 µs) improves switching performance. Verify that the higher current rating does not cause thermal or reliability concerns in the application.

Q: What is the advantage of S2M-LTP over S2K-M3/5BT?

A: S2M-LTP provides 1000 V reverse voltage (200 V higher margin) with 2 A current rating (0.5 A higher capacity). Fast recovery characteristics (≤ 500 ns) improve switching speed compared to standard recovery (2 µs). Use S2M-LTP when higher voltage margin or faster switching is required.

Q: Can I substitute S1M for S2K-M3/5BT?

A: S1M is not a direct substitute. While it provides 1000 V reverse voltage, the current rating is only 1 A (0.5 A below the primary part requirement). Additionally, S1M uses SMA package format instead of SMB. Use S1M only if circuit design accommodates reduced current capacity and SMA package dimensions.

Q: What is the difference between DO-214AA (SMB) and SMA packages?

A: DO-214AA (SMB) and SMA are different surface mount package formats with different footprints and dimensions. SMB packages are larger and accommodate higher current ratings. SMA packages are smaller. Verify PCB layout compatibility before substituting between these package formats.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Q: Can I use S3KB (3 A rating) instead of S2K-M3/5BT (1.5 A rating)?

A: Yes. S3KB maintains 800 V reverse voltage with higher 3 A current rating in the same DO-214AA (SMB) package. This part is suitable when circuit design allows for higher current capacity. Verify that the higher current rating does not introduce thermal or reliability concerns.

Q: What does "Standard Recovery >500ns" mean?

A: Standard recovery indicates reverse recovery time greater than 500 nanoseconds. This is typical for general-purpose rectifier diodes. Faster recovery (≤ 500 ns) is available in parts like S2M-LTP and improves switching performance in high-frequency applications.

Q: Should I choose higher voltage rating (1000 V) or stick with 800 V?

A: Use 800 V rated parts (S2K-M3/5BT, S2K-E3/52T, S2KHE3_A/H, S2K, S3KB) when circuit design specifies 800 V operation. Use 1000 V rated parts (S1M, S2M, S2M-LTP, S3MB) when higher voltage margin is required for reliability or when circuit topology requires voltage headroom above 800 V.

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