S1G Equivalent & Substitute Parts

Part Overview

The S1G is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it is in mature or obsolete status. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design flexibility, or performance optimization while maintaining electrical and mechanical compatibility.

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)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 400 V
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S1G is determined by strict electrical and mechanical compatibility criteria. All substitute parts must meet or exceed the following parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AC (SMA) or compatible surface mount package
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Up to 1.3 V @ 1 A (S1G specifies 1.1 V maximum)
Reverse Recovery Time (trr): Standard recovery (>500 ns) or faster recovery acceptable
Current - Reverse Leakage @ Vr: Up to 10 µA @ 400 V (S1G specifies 1 µA)
Operating Temperature - Junction: Minimum -55°C, maximum 150°C or higher

Substitute parts are grouped into two categories: direct electrical equivalents with identical or superior performance characteristics, and functional alternatives with acceptable parameter variations for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	trr (µs/ns)	Ir @ Vr (µA)	Package	Temp Range (°C)	Product Status
S1G	onsemi	400	1	1.1 @ 1 A	1.8 µs	1 @ 400 V	DO-214AC (SMA)	-55 to 150	Not For New Designs
ES1G	Good-Ark Semiconductor	400	1	1.3 @ 1 A	35 ns	5 @ 400 V	DO-214AC (SMA)	-55 to 125	Active
MRA4004T3G	onsemi	400	1	1.1 @ 1 A	>500 ns	10 @ 400 V	DO-214AC (SMA)	-55 to 175	Not For New Designs
RS1G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	150 ns	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
CMR1-04M BK PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	>500 ns	10 @ 400 V	DO-214AC (SMA)	-65 to 150	Active
CMR1-04M TR13 PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	>500 ns	5 @ 400 V	DO-214AC (SMA)	-65 to 150	Active
ES1G-13-F	Diodes Incorporated	400	1	1.25 @ 1 A	25 ns	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
ES1G-LTP	Micro Commercial Co	400	1	1.25 @ 1 A	35 ns	5 @ 400 V	DO-214AC (SMA)	-65 to 175	Active
PNS40010ER,115	Nexperia USA Inc.	400	1	1.1 @ 1 A	1.8 µs	1 @ 400 V	SOD-123W	-55 to 175	Active
S1G-13-F	Diodes Incorporated	400	1	1.1 @ 1 A	3 µs	5 @ 400 V	DO-214AC (SMA)	-65 to 150	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Performance Characteristics):

The following parts provide electrical performance matching or exceeding the S1G specification:

S1G-13-F (Diodes Incorporated): Active product status with identical forward voltage (1.1 V @ 1 A), reverse voltage (400 V), and current rating (1 A). Operating temperature range extends to -65°C. Reverse recovery time of 3 µs is within acceptable standard recovery specification. ROHS3 compliant.
CMR1-04M TR13 PBFREE (Central Semiconductor Corp): Active product with matching electrical specifications (1.1 V forward voltage, 400 V reverse voltage, 1 A current). Extended operating temperature range (-65 to 150°C). Tape & Reel packaging available. ROHS3 compliant.

Functional Alternatives (Acceptable Parameter Variations):

The following parts meet mandatory electrical and mechanical requirements with acceptable variations:

ES1G-13-F (Diodes Incorporated): Active product with fast recovery characteristics (25 ns trr). Forward voltage of 1.25 V @ 1 A is within acceptable tolerance. Reverse leakage of 5 µA @ 400 V is acceptable. ROHS3 compliant.
ES1G-LTP (Micro Commercial Co): Active product with fast recovery (35 ns trr) and extended temperature range (-65 to 175°C). Forward voltage of 1.25 V @ 1 A and reverse leakage of 5 µA @ 400 V are within acceptable limits. ROHS3 compliant.
RS1G (Taiwan Semiconductor Corporation): Active product with fast recovery (150 ns trr). Forward voltage of 1.3 V @ 1 A and reverse leakage of 5 µA @ 400 V are acceptable. ROHS3 compliant.
ES1G (Good-Ark Semiconductor): Active product with fast recovery (35 ns trr). Forward voltage of 1.3 V @ 1 A is acceptable. Operating temperature range limited to -55 to 125°C. ROHS3 compliant.
CMR1-04M BK PBFREE (Central Semiconductor Corp): Active product with standard recovery characteristics. Electrical specifications match S1G requirements. Bulk packaging available. Extended temperature range (-65 to 150°C). ROHS3 compliant.

Package Consideration:

PNS40010ER,115 (Nexperia USA Inc.): Electrical specifications match S1G (1.1 V forward voltage, 1.8 µs reverse recovery time, 1 µA reverse leakage). Package is SOD-123W instead of DO-214AC (SMA), requiring PCB layout modification. Active product with AEC-Q100 automotive qualification. ROHS3 compliant.

Not Recommended for Direct Substitution:

MRA4004T3G (onsemi): Product status is "Not For New Designs," same as S1G. While electrically compatible, this does not address the obsolescence concern.
RR2L4SDDTE25 (Rohm Semiconductor): Current rating of 2 A exceeds S1G specification. Product status is "Not For New Designs." Not suitable for 1 A applications requiring exact current matching.

Frequently Asked Questions (FAQ)

Q: Can I substitute the S1G with any of the listed parts without circuit modification?

A: Parts with DO-214AC (SMA) package designation can be substituted without PCB layout modification. These include S1G-13-F, ES1G-13-F, ES1G-LTP, RS1G, CMR1-04M variants, and ES1G. The PNS40010ER,115 uses SOD-123W package and requires PCB layout changes.

Q: What is the difference between standard recovery and fast recovery diodes?

A: The S1G specifies standard recovery with reverse recovery time (trr) of 1.8 µs (>500 ns). Fast recovery diodes such as ES1G-13-F (25 ns) and RS1G (150 ns) have shorter recovery times, reducing switching losses in high-frequency applications. Both types are electrically compatible for general-purpose rectification at 1 A, 400 V.

Q: Why do some substitute parts have higher forward voltage (Vf)?

A: Forward voltage variation between 1.1 V and 1.3 V @ 1 A is within acceptable tolerance for general-purpose rectifier applications. The difference represents normal manufacturing variation and different semiconductor materials. For applications sensitive to forward voltage drop, select parts specifying 1.1 V maximum (S1G-13-F, CMR1-04M variants, PNS40010ER,115).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the S1G compliance status.

Q: What is the significance of product status "Active" versus "Not For New Designs"?

A: "Active" status indicates the manufacturer continues production and supports the part for new designs. "Not For New Designs" indicates the part is in mature or obsolete status with limited future availability. For new applications, select parts with "Active" status: S1G-13-F, ES1G-13-F, ES1G-LTP, RS1G, CMR1-04M variants, ES1G, or PNS40010ER,115.

Q: Can I use a 2 A rated diode (RR2L4SDDTE25) in place of the 1 A S1G?

A: While electrically compatible at 400 V reverse voltage, the RR2L4SDDTE25 is rated for 2 A average rectified current. Using a higher-rated component is acceptable from a safety perspective but introduces unnecessary cost and board space. The RR2L4SDDTE25 also carries "Not For New Designs" status. For 1 A applications, select 1 A rated parts.

Q: What packaging options are available for S1G substitutes?

A: Most substitutes use DO-214AC (SMA) package, identical to S1G. CMR1-04M variants are available in both Bulk and Tape & Reel (TR) packaging. PNS40010ER,115 uses SOD-123W package. Verify packaging availability and reel specifications with supplier before procurement.

Q: Are there automotive-qualified alternatives to the S1G?

A: Yes. PNS40010ER,115 (Nexperia USA Inc.) carries AEC-Q100 automotive qualification. This part is suitable for automotive applications requiring 400 V, 1 A rectification in SOD-123W package.

Q: What is the operating temperature range consideration for substitution?

A: The S1G specifies -55°C to 150°C junction temperature. Most substitutes meet or exceed this range. ES1G-LTP and PNS40010ER,115 extend to 175°C maximum. CMR1-04M variants extend to -65°C minimum. Select parts based on application temperature requirements.

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