S1G-F Equivalent & Substitute Parts Reference

Part Overview

The S1G-F is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SMA (DO-214AC) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The S1G-F operates across a junction temperature range of -65°C to 175°C with standard recovery characteristics and unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 175	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the S1G-F are classified based on electrical parameter compatibility within the 400 V / 1 A rectifier diode category. All substitute candidates maintain the same package format (DO-214AC / SMA surface mount) and core voltage and current ratings. Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.1 V @ 1 A
Reverse Recovery Time (trr): ≤ 2.5 µs
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 400 V
Operating Temperature - Junction: Minimum ≥ -65°C, Maximum ≥ 175°C (or acceptable for application)

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (matching all primary and secondary parameters) and Parametric Equivalents (matching primary parameters with acceptable variations in secondary characteristics).

Parameter Comparison

Parameter	S1G-F (SMC)	GS1G (SURGE)	S1G (Diotec)	ES1G (Good-Ark)
Manufacturer	SMC Diode Solutions	SURGE	Diotec Semiconductor	Good-Ark Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.3 V @ 1 A
Reverse Recovery Time (trr)	2.5 µs	1 µs	1.5 µs	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	1 µA @ 400 V	1 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	Not specified	8 pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65 to 175°C	-55 to 150°C	-50 to 150°C	-55 to 125°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

GS1G (SURGE) - Direct Manufacturer Equivalent

The GS1G is a direct parametric equivalent suitable for replacement in applications where the S1G-F is specified. It maintains identical voltage and current ratings (400 V / 1 A) with matching forward voltage characteristics (1.1 V @ 1 A). The GS1G exhibits improved reverse recovery time (1 µs versus 2.5 µs) and reduced reverse leakage current (1 µA versus 5 µA), representing performance enhancements over the original part. The GS1G is ROHS3 compliant and carries active product status with 55,700 units in stock. Operating temperature range (-55 to 150°C) is narrower than the S1G-F but remains suitable for standard industrial applications. This part is recommended as the primary substitute.

S1G (Diotec Semiconductor) - Parametric Equivalent

The S1G from Diotec Semiconductor is a parametric equivalent offering identical voltage and current ratings with matching forward voltage (1.1 V @ 1 A). Reverse recovery time (1.5 µs) is improved relative to the S1G-F. Reverse leakage current (1 µA) is reduced. The S1G is ROHS3 compliant with active product status and 29,439 units in stock. Operating temperature range (-50 to 150°C) is narrower than the original part. This part is recommended as a secondary substitute where GS1G availability is limited.

ES1G (Good-Ark Semiconductor) - Similar Part with Performance Variation

The ES1G is classified as a similar part rather than a direct equivalent due to forward voltage elevation (1.3 V @ 1 A versus 1.1 V @ 1 A) and reduced maximum junction temperature (125°C versus 175°C). However, the ES1G provides significantly faster recovery characteristics (35 ns versus 2.5 µs), lower capacitance (8 pF versus 15 pF), and reduced reverse leakage (5 µA matching the original). The ES1G is ROHS3 compliant with active product status and 415,300 units in stock. This part is suitable only for applications where the elevated forward voltage drop and reduced temperature range are acceptable and where fast recovery characteristics provide circuit benefit.

Frequently Asked Questions (FAQ)

Q: Can the GS1G directly replace the S1G-F without circuit modification?

A: Yes. The GS1G maintains identical voltage and current ratings (400 V / 1 A) and forward voltage characteristics (1.1 V @ 1 A). The improved reverse recovery time and reduced leakage current represent performance enhancements that do not require circuit redesign. Operating temperature range is narrower (-55 to 150°C versus -65 to 175°C); verify application requirements do not exceed these limits.

Q: What is the difference between the GS1G and S1G (Diotec) substitutes?

A: Both are parametric equivalents with identical voltage, current, and forward voltage ratings. The GS1G has faster reverse recovery (1 µs versus 1.5 µs) and lower reverse leakage (1 µA versus 1 µA, equivalent). The S1G from Diotec is available in Tape & Reel packaging, while GS1G is supplied in Bag packaging. Selection depends on procurement format requirements and inventory availability.

Q: Why is the ES1G listed as a similar part rather than a direct equivalent?

A: The ES1G exhibits two significant deviations from the S1G-F specification: forward voltage is elevated to 1.3 V @ 1 A (versus 1.1 V), and maximum junction temperature is reduced to 125°C (versus 175°C). These parameters may impact circuit performance and thermal margin. The ES1G is suitable only when these variations are acceptable for the application and when fast recovery characteristics (35 ns) provide circuit benefit.

Q: Are all substitute parts available in the same SMA (DO-214AC) package?

A: Yes. All substitute parts (GS1G, S1G, and ES1G) are supplied in DO-214AC / SMA surface mount package format, ensuring mechanical and electrical compatibility with the original S1G-F footprint and PCB layout.

Q: What compliance certifications apply to the substitute parts?

A: GS1G, S1G (Diotec), and ES1G are all ROHS3 compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity level. The S1G-F original part does not specify RoHS status. Verify compliance requirements for your application before final part selection.

Q: What is the inventory status of each substitute part?

A: GS1G: 55,700 units in stock. S1G (Diotec): 29,439 units in stock. ES1G: 415,300 units in stock. All parts are classified as new original stock. Verify current availability with your supplier before procurement.

Q: Can the ES1G be used in high-temperature applications where the S1G-F was originally specified?

A: No. The ES1G maximum junction temperature is 125°C, compared to the S1G-F specification of 175°C. Applications requiring operation above 125°C must use GS1G or S1G (Diotec) substitutes, both rated to 150°C maximum.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message