S1K-M3/5AT Equivalent & Substitute Parts

Part Overview

The S1K-M3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 800 V reverse voltage with 1 A average rectified current in a DO-214AC (SMA) package. The part is Active in product status and fully compliant with RoHS3 and REACH regulations. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and packaging specifications to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the S1K-M3/5AT are classified into two primary groups based on electrical and mechanical compatibility:

Group 1: Direct Parametric Equivalents (800 V, 1 A, Standard Recovery)

These parts match all critical electrical parameters of the main part: 800 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage at 1 A, 1.8 µs reverse recovery time, and DO-214AC (SMA) package. Parts in this group are interchangeable without circuit modification. This group includes S1K-E3/5AT, S1K-E3/61T, S1KHE3_A/I, and S1KHM3_A/H from Vishay General Semiconductor - Diodes Division, and GS1K_R1_00001 from Panjit International Inc.

Group 2: Higher Voltage Rated Alternatives (1000 V, 1 A)

These parts operate at elevated reverse voltage (1000 V) while maintaining 1 A average rectified current and DO-214AC (SMA) package compatibility. Higher voltage rating provides additional design margin in applications where 800 V operation is acceptable. This group includes GF1M (onsemi), GS1M-LTP (Micro Commercial Co), and MRA4007T3G (onsemi).

Group 3: Fast Recovery Technology (800 V, 1 A)

The STTH108A from STMicroelectronics operates at 800 V with 1 A current but features fast recovery technology (75 ns reverse recovery time) compared to standard recovery (1.8 µs). This part is suitable for applications requiring reduced switching losses.

Group 4: Fast Recovery Technology (1000 V, 1 A)

The STTH110A from STMicroelectronics operates at 1000 V with 1 A current and fast recovery technology (75 ns reverse recovery time) in DO-214AC (SMA) package.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Product Status	Temperature Range [°C]
S1K-M3/5AT	Vishay	800	1	1.1 @ 1 A	1.8 µs	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
S1K-E3/5AT	Vishay	800	1	1.1 @ 1 A	1.8 µs	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
S1K-E3/61T	Vishay	800	1	1.1 @ 1 A	1.8 µs	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
S1KHE3_A/I	Vishay	800	1	1.1 @ 1 A	1.8 µs	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
S1KHM3_A/H	Vishay	800	1	1.1 @ 1 A	1.8 µs	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
GS1K_R1_00001	Panjit	800	1	1.1 @ 1 A	Standard >500ns	1 @ 800 V	DO-214AC (SMA)	Active	-55 to 150
GF1M	onsemi	1000	1	1.2 @ 1 A	2 µs	5 @ 1000 V	DO-214AC (SMA)	Not For New Designs	-65 to 175
GS1M-LTP	Micro Commercial Co	1000	1	1 @ 1 A	Standard >500ns	10 @ 1000 V	DO-214AC (SMA)	Active	-55 to 150
MRA4007T3G	onsemi	1000	1	1.1 @ 1 A	Standard >500ns	10 @ 1000 V	DO-214AC (SMA)	Not For New Designs	-55 to 175
STTH108A	STMicroelectronics	800	1	1.65 @ 1 A	75 ns	5 @ 800 V	DO-214AC (SMA)	Active	-55 to 175
STTH110A	STMicroelectronics	1000	1	1.7 @ 1 A	75 ns	10 @ 1000 V	DO-214AC (SMA)	Active	-55 to 175

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Specifications)

Select S1K-E3/5AT, S1K-E3/61T, S1KHE3_A/I, or S1KHM3_A/H when direct substitution is required. All four parts are manufactured by Vishay General Semiconductor - Diodes Division and match the S1K-M3/5AT across all critical parameters: 800 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage, 1.8 µs reverse recovery time, and DO-214AC (SMA) package. S1KHE3_A/I and S1KHM3_A/H carry AEC-Q101 automotive qualification, suitable for automotive applications. All parts are Active in product status and ROHS3 compliant.

GS1K_R1_00001 from Panjit International Inc. provides an alternative direct equivalent with identical voltage and current ratings, forward voltage, and package. This part is Active in product status and ROHS3 compliant.

For Higher Voltage Margin Applications

Select GS1M-LTP (Micro Commercial Co) or MRA4007T3G (onsemi) when circuit design permits 1000 V reverse voltage operation. Both parts maintain 1 A average rectified current and DO-214AC (SMA) package compatibility. GS1M-LTP is Active in product status. MRA4007T3G is marked Not For New Designs but remains available with high inventory. GF1M (onsemi) is also available but marked Not For New Designs.

For Fast Recovery Applications

Select STTH108A (STMicroelectronics) for 800 V applications requiring fast recovery technology (75 ns reverse recovery time). This part is Active in product status and suitable for switching applications with reduced switching losses. For 1000 V fast recovery operation, select STTH110A (STMicroelectronics), also Active in product status.

Compliance and Regulatory Considerations

All substitute parts listed are ROHS3 compliant and REACH unaffected. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions. All parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can S1K-E3/5AT be used as a direct replacement for S1K-M3/5AT?

A: Yes. S1K-E3/5AT is a direct parametric equivalent manufactured by Vishay General Semiconductor - Diodes Division. Both parts share identical electrical specifications (800 V, 1 A, 1.1 V forward voltage, 1.8 µs recovery time) and DO-214AC (SMA) package. No circuit modification is required.

Q: What is the difference between S1K-M3/5AT and the automotive-qualified variants S1KHE3_A/I and S1KHM3_A/H?

A: The automotive variants S1KHE3_A/I and S1KHM3_A/H carry AEC-Q101 qualification and are designated for automotive applications. All three parts share identical electrical parameters and package specifications. Selection depends on application requirements for automotive qualification.

Q: Can I use GF1M or MRA4007T3G as substitutes for S1K-M3/5AT?

A: GF1M and MRA4007T3G are higher voltage rated alternatives (1000 V vs. 800 V) and are marked Not For New Designs. While electrically compatible in applications tolerating 1000 V operation, these parts are not recommended for new designs. GS1M-LTP (Micro Commercial Co) is an Active alternative with 1000 V rating.

Q: What is the advantage of STTH108A over S1K-M3/5AT?

A: STTH108A features fast recovery technology with 75 ns reverse recovery time compared to 1.8 µs for S1K-M3/5AT. Both operate at 800 V and 1 A in DO-214AC (SMA) package. Fast recovery reduces switching losses in high-frequency applications. STTH108A forward voltage is 1.65 V at 1 A, higher than S1K-M3/5AT at 1.1 V.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts listed are packaged in DO-214AC (SMA) surface mount format, matching the S1K-M3/5AT package specification. Mounting type is Surface Mount for all parts, ensuring PCB compatibility.

Q: What is the temperature operating range for substitute parts?

A: S1K-M3/5AT and most direct equivalents operate from -55°C to 150°C junction temperature. STTH108A and STTH110A extend to 175°C maximum. GF1M and MRA4007T3G extend to -65°C minimum and 175°C maximum. Application temperature requirements determine appropriate part selection.

Q: Can GS1K_R1_00001 from Panjit be used as a substitute?

A: Yes. GS1K_R1_00001 is a parametric equivalent with 800 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage, and DO-214AC (SMA) package. Reverse leakage current is 1 µA at 800 V compared to 5 µA for S1K-M3/5AT. The part is Active in product status and ROHS3 compliant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected. Moisture Sensitivity Level is 1 (Unlimited) for all parts.

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