S1ML Equivalent & Substitute Parts Reference

Part Overview

The S1ML is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a Sub SMA surface mount package (DO-219AB). Manufactured by Taiwan Semiconductor Corporation, this component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer available or inventory is depleted.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Package / Case	DO-219AB	Sub SMA
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the S1ML rectifier diode is determined by the following critical parameters:

Electrical Parameters:

Voltage - DC Reverse (Vr) rating must equal or exceed 1000 V
Current - Average Rectified (Io) rating must equal or exceed 1 A
Voltage - Forward (Vf) must be compatible at rated current
Reverse Recovery Time (trr) and leakage current characteristics must be within acceptable ranges for the application

Mechanical Parameters:

Package / Case type determines PCB layout compatibility
Mounting Type must be Surface Mount
Operating Temperature range must encompass the application requirements

Compliance Parameters:

RoHS3 Compliance is mandatory
Moisture Sensitivity Level (MSL) of 1 (Unlimited) is required

Substitute parts are grouped into two categories:

Parametric Equivalent (Full Electrical & Mechanical Match): S1MLH maintains identical electrical specifications, reverse recovery time, leakage current, and capacitance characteristics in the same DO-219AB Sub SMA package.

Manufacturer Recommended Equivalent (Different Package): S1MLW provides identical electrical performance but in an SOD-123W package, suitable for applications where package footprint change is acceptable.

Similar Alternatives (Reduced Current Rating): S1FLM-GS08 and S1FLM-GS18 maintain 1000 V reverse voltage rating but with reduced current rating of 700 mA, suitable only for applications with lower current requirements.

Cross-Manufacturer Alternative (Different Package): GS1010FL_R1_00001 from Panjit International Inc. provides equivalent electrical performance in SOD-123FL package with different thermal characteristics.

Parameter Comparison

Parameter	S1ML	S1MLH	S1MLW	GS1010FL_R1_00001	S1FLM-GS08	S1FLM-GS18
Manufacturer	Taiwan Semiconductor	Taiwan Semiconductor	Taiwan Semiconductor	Panjit International	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	700 mA	700 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Reverse Recovery Time (trr)	1.8 µs	1.8 µs	Not specified	Not specified	1.8 µs	1.8 µs
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	1 µA @ 1000 V	1 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V
Capacitance @ Vr, F	9 pF @ 4V, 1MHz	9 pF @ 4V, 1MHz	Not specified	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz
Package / Case	DO-219AB (Sub SMA)	DO-219AB (Sub SMA)	SOD-123W	SOD-123F	DO-219AB (SMF)	DO-219AB (SMF)
Operating Temperature - Junction	-55 to 175 °C	-55 to 175 °C	-55 to 175 °C	-50 to 150 °C	-55 to 150 °C	-55 to 150 °C
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	15,300 Pcs	62,763 Pcs	2,916 Pcs	365,400 Pcs	77,400 Pcs	49,290 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Performance):

S1MLH is the primary parametric equivalent. It maintains all electrical specifications including 1000 V reverse voltage, 1 A current rating, 1.1 V forward voltage, 1.8 µs reverse recovery time, and 5 µA leakage current. The component is housed in the identical DO-219AB Sub SMA package, requiring no PCB layout modifications. S1MLH carries Active product status with ROHS3 compliance and unlimited moisture sensitivity level. Inventory availability is substantial at 62,763 pieces.

For Package-Agnostic Substitution (Identical Electrical Performance, Different Package):

S1MLW provides equivalent electrical performance with 1000 V reverse voltage and 1 A current rating in an SOD-123W package. This option is suitable for applications where package footprint change is acceptable. The component is Active status with ROHS3 compliance. Forward voltage and current ratings are identical to the original S1ML. Inventory is limited at 2,916 pieces.

For Cross-Manufacturer Substitution (Equivalent Electrical Performance):

GS1010FL_R1_00001 from Panjit International Inc. delivers 1000 V reverse voltage and 1 A current rating in an SOD-123FL package. This component exhibits lower reverse leakage current (1 µA versus 5 µA) and reduced capacitance (4 pF versus 9 pF), which may provide performance benefits in certain circuit topologies. Operating temperature range is -50 to 150 °C, which is narrower than the original S1ML. The component is Active status with ROHS3 compliance and high inventory availability at 365,400 pieces.

For Current-Limited Applications Only:

S1FLM-GS08 and S1FLM-GS18 from Vishay General Semiconductor are suitable only for applications requiring 700 mA or less average rectified current. Both maintain 1000 V reverse voltage rating and are available in DO-219AB packages. These components are Active status with ROHS3 compliance. Use these alternatives only when circuit design permits reduced current capacity.

Frequently Asked Questions (FAQ)

Q: Can S1MLH be used as a direct drop-in replacement for S1ML?

A: Yes. S1MLH is a parametric equivalent with identical electrical specifications (1000 V, 1 A, 1.1 V forward voltage, 1.8 µs recovery time) and the same DO-219AB Sub SMA package. No circuit modifications or PCB layout changes are required.

Q: What is the difference between S1MLW and S1MLH?

A: Both provide identical electrical performance at 1000 V and 1 A. The primary difference is package type: S1MLW uses SOD-123W while S1MLH uses DO-219AB Sub SMA. Package selection depends on PCB layout constraints and available footprint space.

Q: Can S1FLM-GS08 or S1FLM-GS18 replace S1ML in all applications?

A: No. These Vishay components have a reduced current rating of 700 mA versus the original 1 A specification. They are suitable only for applications designed for 700 mA or lower current operation. Verify circuit current requirements before substitution.

Q: What is the significance of the GS1010FL_R1_00001 lower leakage current specification?

A: GS1010FL_R1_00001 exhibits 1 µA reverse leakage current compared to 5 µA in the S1ML. Lower leakage current reduces power dissipation in high-impedance circuits and may improve performance in precision analog applications. However, the narrower operating temperature range (-50 to 150 °C versus -55 to 175 °C) must be verified against application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliance certification, meeting environmental and hazardous substance restrictions.

Q: What is the impact of different capacitance values among substitute parts?

A: Capacitance differences (9 pF in S1ML and S1MLH versus 4 pF in GS1010FL_R1_00001, S1FLM-GS08, and S1FLM-GS18) affect high-frequency circuit behavior. Lower capacitance reduces parasitic effects in switching applications. Verify capacitance specifications against circuit design requirements, particularly in high-frequency rectification or switching power supply applications.

Q: Which substitute part has the best inventory availability?

A: GS1010FL_R1_00001 from Panjit International Inc. has the highest inventory at 365,400 pieces. However, this part has a reduced current rating (700 mA) and narrower operating temperature range, so it is suitable only for applications meeting these constraints.

Q: Can S1MLW be used in applications requiring the full 1 A current rating?

A: Yes. S1MLW maintains the full 1 A current rating and 1000 V reverse voltage specification. The only difference from S1MLH is the package type (SOD-123W versus DO-219AB). Electrical performance is equivalent.

Q: What is the operating temperature consideration when selecting GS1010FL_R1_00001?

A: GS1010FL_R1_00001 has an operating temperature range of -50 to 150 °C, which is narrower than the S1ML range of -55 to 175 °C. Applications requiring operation below -50 °C or above 150 °C must use S1MLH, S1MLW, or the Vishay alternatives (S1FLM-GS08, S1FLM-GS18), which support -55 to 150 °C.

Q: Are there any compliance or certification differences among the substitute parts?

A: All substitute parts are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH Unaffected status. No compliance differences exist among the listed alternatives.

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