S5MS-M3/9AT Equivalent & Substitute Parts

Part Overview

The S5MS-M3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 1000 V DC reverse voltage with 1.6 A average rectified current in a DO-214AB (SMC) package. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter ranges for this product category, or when higher current ratings and compatible voltage specifications provide functional interchangeability in circuit applications.

Key Parameters

Parameter	S5MS-M3/9AT	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1.6	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 5	V @ A
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	10 @ 1000	µA @ V
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution logic for the S5MS-M3/9AT is based on the following allowed parameters:

Primary Substitution Criteria:

Package / Case: DO-214AB (SMC) surface mount configuration
Voltage - DC Reverse (Vr) (Max): Equal to or greater than 1000 V
Current - Average Rectified (Io): Equal to or greater than 1.6 A
Mounting Type: Surface Mount
Technology: Standard recovery characteristics

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -55°C junction temperature
RoHS3 Compliance: Required for environmental and regulatory alignment
Reverse Recovery Time: Standard recovery (>500 ns) acceptable

Substitute parts are grouped into two categories:

Category A - Voltage-Matched (1000 V) with Higher Current Ratings: Parts that maintain the 1000 V reverse voltage specification while providing equal or higher current capacity (3 A to 6 A). These include S3M-TP, S5ML-TP, and SMLJ60S10-TP.

Category B - Reduced Voltage (800 V) with Higher Current Ratings: Parts that operate at 800 V reverse voltage with significantly higher current capacity (3 A to 5 A). These include S3K and S5KL-TP. These are suitable for applications where the circuit voltage requirement does not exceed 800 V.

Category C - Fast Recovery Technology: STTH310S operates at 1000 V with 3 A current but features fast recovery characteristics (75 ns trr) compared to the standard recovery of S5MS-M3/9AT.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V @ A)	trr (µs)	Ir @ Vr (µA @ V)	Package	Temp Range (°C)	RoHS3
S5MS-M3/9AT	Vishay	1000	1.6	1.15 @ 5	2.5	10 @ 1000	DO-214AB	-55 to 150	Yes
S3K	Diotec	800	3	1.15 @ 3	1.5	5 @ 800	DO-214AB	-50 to 150	Yes
S3K-TP	Micro Commercial Co	800	3	1.2 @ 3	-	10 @ 800	DO-214AB	-55 to 150	Yes
S3M	Diotec	1000	3	1.15 @ 3	1.5	5 @ 1000	DO-214AB	-50 to 150	No
S3M-TP	Micro Commercial Co	1000	3	1.2 @ 3	-	10 @ 1000	DO-214AB	-55 to 150	Yes
S5KL-TP	Micro Commercial Co	800	5	1.2 @ 5	-	10 @ 800	DO-214AB	-55 to 150	Yes
S5ML-TP	Micro Commercial Co	1000	5	1.2 @ 5	-	10 @ 1000	DO-214AB	-55 to 150	Yes
SMLJ60S10-TP	Micro Commercial Co	1000	6	1 @ 6	-	5 @ 1000	DO-214AB	-55 to 150	Yes
STTH310S	STMicroelectronics	1000	3	1.7 @ 3	0.075	10 @ 1000	DO-214AB	-40 to 175	Yes

Engineering Selection Recommendations

For Direct Voltage and Current Equivalence (1000 V, ≥1.6 A):

S3M-TP and S5ML-TP are the primary selections when maintaining the original 1000 V specification with increased current capacity. Both parts are RoHS3 compliant, operate across the required temperature range (-55°C to 150°C), and are available in Tape & Reel packaging. S3M-TP provides 3 A capacity with standard recovery characteristics, while S5ML-TP provides 5 A capacity. SMLJ60S10-TP extends this to 6 A with improved forward voltage characteristics (1.0 V @ 6 A).

For Reduced Voltage Applications (800 V, ≥1.6 A):

S3K-TP and S5KL-TP are suitable when circuit voltage requirements do not exceed 800 V. Both are RoHS3 compliant with MSL 1 rating and operate across -55°C to 150°C. S3K-TP provides 3 A capacity while S5KL-TP provides 5 A capacity. These parts offer improved reverse recovery time (1.5 µs for S3K) compared to the original specification.

For Fast Recovery Applications (1000 V, 3 A):

STTH310S from STMicroelectronics operates at 1000 V with 3 A capacity but features fast recovery technology (75 ns trr) versus standard recovery. This part is RoHS3 compliant and extends the operating temperature range to 175°C. Forward voltage is higher at 1.7 V @ 3 A.

Compliance and Availability:

All recommended substitutes maintain RoHS3 compliance and MSL 1 rating. S3M-TP, S5ML-TP, and SMLJ60S10-TP show the highest inventory availability (321,300, 4,200, and 12,900 units respectively), supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can S3K or S5KL-TP be used as direct replacements for S5MS-M3/9AT?

A: S3K and S5KL-TP operate at 800 V maximum reverse voltage, compared to the original 1000 V specification. These parts are suitable only for applications where the circuit voltage requirement does not exceed 800 V. Both provide higher current capacity (3 A and 5 A respectively) and improved reverse recovery time. Verify circuit voltage requirements before selection.

Q: What is the difference between S3M-TP and SMLJ60S10-TP?

A: Both parts operate at 1000 V with RoHS3 compliance and -55°C to 150°C temperature range. S3M-TP provides 3 A capacity with forward voltage of 1.2 V @ 3 A. SMLJ60S10-TP provides 6 A capacity with improved forward voltage of 1.0 V @ 6 A and lower reverse leakage (5 µA @ 1000 V versus 10 µA). SMLJ60S10-TP is selected for higher current applications.

Q: Why does STTH310S have a higher forward voltage than other substitutes?

A: STTH310S features fast recovery technology (75 ns trr) compared to standard recovery characteristics of other parts. The higher forward voltage (1.7 V @ 3 A) is a characteristic trade-off of fast recovery diodes. This part is selected for applications requiring reduced reverse recovery time and extended temperature operation to 175°C.

Q: Are all substitute parts available in Tape & Reel packaging?

A: S3K is available in standard packaging (not specified as Tape & Reel). S3M is available in Cut Tape & Digi-Reel. All other substitutes (S3K-TP, S3M-TP, S5KL-TP, S5ML-TP, SMLJ60S10-TP, STTH310S) are available in Tape & Reel or equivalent automated handling packaging suitable for surface mount assembly.

Q: What is the minimum current rating required for a substitute part?

A: The S5MS-M3/9AT operates at 1.6 A average rectified current. All substitute parts listed provide equal or greater current capacity (minimum 3 A), ensuring the substitute can handle the original circuit current requirement with margin.

Q: Can substitute parts with higher current ratings be used in place of S5MS-M3/9AT?

A: Yes. Parts with higher current ratings (3 A, 5 A, or 6 A) are fully compatible with circuits designed for 1.6 A operation. The higher current rating provides additional thermal margin and design flexibility. Verify that forward voltage characteristics and reverse recovery time are acceptable for the specific application.

Q: What is the significance of reverse recovery time differences?

A: S5MS-M3/9AT specifies 2.5 µs reverse recovery time (standard recovery). Substitute parts with standard recovery (S3K, S3M, S5KL-TP, S5ML-TP, SMLJ60S10-TP) maintain this characteristic. STTH310S features fast recovery (75 ns), which reduces switching losses in high-frequency applications but increases forward voltage. Select based on circuit switching frequency requirements.

Q: Are there RoHS compliance differences among substitute parts?

A: S3M from Diotec does not specify RoHS3 compliance status. All other substitutes (S3K, S3K-TP, S3M-TP, S5KL-TP, S5ML-TP, SMLJ60S10-TP, STTH310S) are confirmed RoHS3 compliant. For applications requiring RoHS3 certification, exclude S3M and select from the compliant alternatives.

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