Equivalent & Substitute Parts for S3MB-13

Part Overview

The S3MB-13 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Alternative parts must satisfy the electrical and mechanical specifications required for general-purpose rectification applications in this voltage and current class.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitution of the S3MB-13 is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), recovery speed classification, and package type. Parts are grouped into three categories based on substitution compatibility:

Category 1: Direct Parametric Equivalents — Parts with identical or superior electrical specifications and the same SMB package, maintaining full compatibility with the original design. These parts satisfy all key parameters: 1000 V reverse voltage, 3 A current rating, standard recovery speed, and SMB package configuration.

Category 2: Functional Equivalents with Parameter Variations — Parts that maintain the 1000 V reverse voltage and SMB package but differ in current rating, forward voltage, or recovery speed characteristics. These parts require circuit-level evaluation to confirm suitability.

Category 3: Partial Equivalents with Reduced Ratings — Parts with reduced reverse voltage (800 V) or current rating (1-2 A) or different package types (SMA). These parts are suitable only for applications with lower voltage or current requirements than the original specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Package	Product Status	RoHS Status
S3MB-13	Diodes Incorporated	1000	3	1.15 @ 3A	Standard >500ns	DO-214AA, SMB	Discontinued	Non-compliant
S3MB-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	Standard >500ns	DO-214AA, SMB	Active	ROHS3 Compliant
CGRB307-G	Comchip Technology	1000	3	1.1 @ 3A	Standard >500ns	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1U-10 TR13 PBFREE	Central Semiconductor Corp	1000	1	1.7 @ 1A	Fast ≤500ns	DO-214AA, SMB	Active	ROHS3 Compliant
RS2M	MDD	1000	2	1.3 @ 2A	Fast ≤500ns	DO-214AC, SMA	Active	RoHS Compliant
S3KB-TP	Micro Commercial Co	800	3	1.15 @ 3A	Standard >500ns	DO-214AA, SMB	Active	ROHS3 Compliant
S3MB-TP	Micro Commercial Co	1000	3	1.15 @ 3A	Standard >500ns	DO-214AA, SMB	Active	ROHS3 Compliant
S3MBHR5G	Taiwan Semiconductor Corporation	1000	3	1.15 @ 3A	Standard >500ns	DO-214AA, SMB	Discontinued	ROHS3 Compliant
STTH208U	STMicroelectronics	800	2	1.65 @ 2A	Fast ≤500ns	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: S3MB-13-F (Diodes Incorporated)

The S3MB-13-F is the direct parametric equivalent of the S3MB-13, offering identical electrical specifications: 1000 V reverse voltage, 3 A average rectified current, 1.15 V forward voltage drop at 3 A, and standard recovery speed characteristics. The part maintains the same SMB package configuration and operating temperature range. S3MB-13-F is currently active in production with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This part provides the highest compatibility for direct replacement in existing designs.

Secondary Recommendation: S3MB-TP (Micro Commercial Co)

The S3MB-TP matches all critical electrical parameters of the S3MB-13: 1000 V reverse voltage, 3 A current rating, 1.15 V forward voltage drop, and standard recovery speed. The part is supplied in SMB package configuration and is currently active with ROHS3 compliance. S3MB-TP is suitable for applications requiring identical electrical performance with an alternative manufacturer source.

Tertiary Recommendation: CGRB307-G (Comchip Technology)

The CGRB307-G provides 1000 V reverse voltage and 3 A current rating with a lower forward voltage drop of 1.1 V at 3 A compared to the S3MB-13. The part uses the same SMB package and is currently active with ROHS3 compliance. CGRB307-G is suitable for applications where reduced forward voltage drop provides thermal or efficiency benefits.

Conditional Recommendations:

S3KB-TP (Micro Commercial Co) is suitable only for applications with maximum operating voltages of 800 V or lower, as it provides reduced reverse voltage rating while maintaining 3 A current capacity and identical forward voltage characteristics.

CMR1U-10 TR13 PBFREE (Central Semiconductor Corp) is suitable only for applications requiring 1 A or lower current, as it provides reduced current rating despite maintaining 1000 V reverse voltage. This part features fast recovery speed (≤500ns) and higher forward voltage drop (1.7 V at 1 A).

RS2M (MDD) is suitable only for applications requiring 2 A or lower current with 1000 V reverse voltage. This part uses the SMA package (DO-214AC) rather than SMB, requiring PCB layout modifications. Fast recovery speed and higher forward voltage drop (1.3 V at 2 A) are additional considerations.

STTH208U (STMicroelectronics) is suitable only for applications with maximum operating voltages of 800 V and current requirements of 2 A or lower. This part features fast recovery speed and higher forward voltage drop (1.65 V at 2 A).

Frequently Asked Questions (FAQ)

Q: Can S3MB-13-F be used as a direct replacement for S3MB-13?

A: Yes. S3MB-13-F provides identical electrical specifications: 1000 V reverse voltage, 3 A average rectified current, 1.15 V forward voltage drop at 3 A, and standard recovery speed. Both parts use the SMB package. S3MB-13-F is currently active in production with ROHS3 compliance, whereas S3MB-13 is discontinued.

Q: What is the difference between S3MB-TP and S3MB-13-F?

A: Both parts provide identical electrical specifications and SMB package configuration. The primary difference is manufacturer: S3MB-TP is supplied by Micro Commercial Co, while S3MB-13-F is supplied by Diodes Incorporated. Both are currently active with ROHS3 compliance.

Q: Can S3KB-TP be used in place of S3MB-13?

A: S3KB-TP is suitable only for applications with maximum operating voltages of 800 V or lower. The part provides identical 3 A current rating, 1.15 V forward voltage drop, and SMB package configuration. If the circuit design requires 1000 V reverse voltage capability, S3KB-TP is not suitable.

Q: Why does CGRB307-G have lower forward voltage drop than S3MB-13?

A: CGRB307-G specifies 1.1 V forward voltage drop at 3 A, compared to 1.15 V for S3MB-13. This difference reflects different semiconductor manufacturing processes and die designs between Comchip Technology and Diodes Incorporated. Both parts meet the 1000 V reverse voltage and 3 A current requirements.

Q: Can CMR1U-10 TR13 PBFREE replace S3MB-13 in high-current applications?

A: No. CMR1U-10 TR13 PBFREE is rated for 1 A average rectified current, whereas S3MB-13 is rated for 3 A. Using a 1 A part in a 3 A application will result in device failure due to thermal stress and current exceeding the rated capacity.

Q: What is the difference between SMB and SMA packages?

A: SMB (DO-214AA) and SMA (DO-214AC) are different surface mount package types with different physical dimensions and PCB footprints. RS2M uses the SMA package, while S3MB-13 uses the SMB package. Direct substitution requires PCB layout modification to accommodate the different package footprint.

Q: Is STTH208U suitable for 1000 V applications?

A: No. STTH208U is rated for 800 V maximum reverse voltage, whereas S3MB-13 is rated for 1000 V. Using STTH208U in a 1000 V application will result in device failure due to reverse voltage exceeding the rated specification.

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

A: Standard recovery speed indicates that the reverse recovery time (trr) exceeds 500 nanoseconds. This classification affects switching characteristics and is suitable for general-purpose rectification applications. Fast recovery diodes (≤500ns) are used in applications requiring faster switching performance.

Q: Are all substitute parts ROHS3 compliant?

A: No. S3MB-13 is RoHS non-compliant. S3MB-13-F, CGRB307-G, CMR1U-10 TR13 PBFREE, S3KB-TP, S3MB-TP, S3MBHR5G, and STTH208U are ROHS3 compliant. RS2M is RoHS compliant. Compliance status must be verified against specific procurement requirements.

Q: Can S3MBHR5G be used as a replacement for S3MB-13?

A: S3MBHR5G provides identical electrical specifications: 1000 V reverse voltage, 3 A current rating, 1.15 V forward voltage drop, and SMB package configuration. However, S3MBHR5G is discontinued at DiGi Electronics, similar to S3MB-13. For active production sourcing, S3MB-13-F or S3MB-TP are preferred alternatives.

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