S1G-13 Equivalent & Substitute Parts

Part Overview

The S1G-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package (DO-214AC). This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The S1G-13 operates with standard recovery characteristics (>500 ns) and is suitable for general rectification applications requiring moderate voltage and current ratings. Due to its discontinued status, direct replacements and functional equivalents are required for new production runs and maintenance of existing designs.

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	V
Reverse Recovery Time (trr)	3	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the S1G-13 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

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

Acceptable Variation Parameters:

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

Substitute parts are grouped into two categories:

Category A - Direct Replacements (Identical Electrical Characteristics): Parts with matching voltage, current, forward voltage, and recovery speed characteristics. These parts are pin-compatible and functionally equivalent without circuit modification.

Category B - Functional Equivalents (Enhanced or Comparable Performance): Parts with identical voltage and current ratings but different recovery characteristics (faster recovery) or slightly elevated forward voltage. These parts are compatible but may offer improved performance in specific applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
S1G-13	Diodes Incorporated	400	1	1.1 @ 1 A	3 µs	5 @ 400 V	DO-214AC, SMA	Discontinued	RoHS non-compliant
S1G-13-F	Diodes Incorporated	400	1	1.1 @ 1 A	3 µs	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
1SR156-400TE25	Rohm Semiconductor	400	1	1.3 @ 800 mA	400 ns	10 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
CGRA4004-G	Comchip Technology	400	1	1.1 @ 1 A	>500 ns	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
CURA104-G	Comchip Technology	400	1	1.3 @ 1 A	50 ns	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
ES1G	Good-Ark Semiconductor	400	1	1.3 @ 1 A	35 ns	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
ES1G-LTP	Micro Commercial Co	400	1	1.25 @ 1 A	35 ns	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
ES2G-LTP	Micro Commercial Co	400	2	1.25 @ 2 A	35 ns	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
GF1G	onsemi	400	1	1.0 @ 1 A	2 µs	5 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
GS1G-LTP	Micro Commercial Co	400	1	1.0 @ 1 A	>500 ns	10 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
GS1GE-TP	Micro Commercial Co	400	1	1.1 @ 1 A	>500 ns	5 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: S1G-13-F

The S1G-13-F is the direct functional equivalent of the S1G-13. It is manufactured by Diodes Incorporated (same manufacturer as the original part), maintains identical electrical specifications (400 V, 1 A, 1.1 V forward voltage, 3 µs recovery time), and is housed in the same DO-214AC SMA package. The S1G-13-F is currently active in production and ROHS3 compliant, addressing the compliance gap of the original discontinued part. This part requires no circuit modification and is the preferred choice for direct replacement.

Secondary Recommendations for Active Production:

CGRA4004-G (Comchip Technology): Maintains identical electrical characteristics to the S1G-13 (400 V, 1 A, 1.1 V forward voltage, standard recovery >500 ns). Currently active and ROHS3 compliant. Suitable for applications where manufacturer diversity is required.

ES1G-LTP (Micro Commercial Co): Rated for 400 V, 1 A with slightly elevated forward voltage (1.25 V @ 1 A) and faster recovery time (35 ns). Currently active and ROHS3 compliant. Appropriate for applications benefiting from reduced reverse recovery losses.

ES1G (Good-Ark Semiconductor): Rated for 400 V, 1 A with 1.3 V forward voltage and 35 ns recovery time. Currently active and ROHS3 compliant. Suitable for high-speed switching applications.

Not Recommended for New Designs:

Parts with "Not For New Designs" status (1SR156-400TE25, GF1G, GS1G-LTP, GS1GE-TP) are available but not recommended for new product development. These parts may be used for legacy system maintenance or repair where original specifications must be preserved.

Higher Current Alternative:

ES2G-LTP is rated for 2 A at 400 V and may be used in applications where the 1 A rating is marginal, provided circuit design accommodates the different current rating.

Frequently Asked Questions (FAQ)

Q: Can I use S1G-13-F as a direct replacement for S1G-13?

A: Yes. The S1G-13-F is electrically and mechanically identical to the S1G-13. Both parts are rated for 400 V, 1 A, have 1.1 V forward voltage at 1 A, and are packaged in DO-214AC SMA. The S1G-13-F is currently in active production and ROHS3 compliant, making it the preferred replacement for the discontinued S1G-13.

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

A: Recovery speed refers to reverse recovery time (trr). The S1G-13 has standard recovery (3 µs, >500 ns). Fast recovery diodes (such as ES1G at 35 ns or CURA104-G at 50 ns) switch off more quickly when reverse-biased, reducing switching losses and heat generation. Fast recovery diodes are suitable for high-frequency switching applications but are not required for low-frequency rectification.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts listed are housed in the DO-214AC SMA package and are surface mount components. They are mechanically compatible with the original S1G-13 footprint and require no PCB redesign.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials (lead, cadmium, mercury, hexavalent chromium, PBBs, and PBDEs) in electrical and electronic equipment. The original S1G-13 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental regulations.

Q: Can I use a 2 A diode (ES2G-LTP) in place of a 1 A diode (S1G-13)?

A: Yes, from an electrical standpoint. A 2 A diode can safely handle 1 A of current. However, circuit design must account for the different current rating. The ES2G-LTP is suitable only if the application can accommodate a higher current-rated component and if thermal management is appropriate.

Q: What is the significance of forward voltage (Vf) differences?

A: Forward voltage is the voltage drop across the diode when conducting. The S1G-13 has 1.1 V forward voltage at 1 A. Substitute parts range from 1.0 V to 1.3 V. Higher forward voltage results in greater power dissipation (heat). For low-power applications, this difference is negligible. For high-current or high-frequency applications, lower forward voltage (such as GF1G at 1.0 V) reduces thermal load.

Q: Why are some parts marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are in mature or declining production phases. While they remain available for existing designs and repairs, manufacturers do not recommend their use in new product development. These parts may have limited future availability or extended lead times. For new designs, select parts with "Active" status.

Q: What is the operating temperature range, and why does it matter?

A: The S1G-13 operates from -65°C to 150°C junction temperature. Substitute parts range from -55°C to 175°C. The operating temperature range defines the thermal environment in which the diode functions reliably. Applications in extreme temperature environments (such as automotive or industrial) require parts with extended temperature ranges. Most general-purpose applications operate within -55°C to 150°C.

Q: Are there any electrical differences that would prevent substitution?

A: All listed substitute parts maintain the 400 V reverse voltage and 1 A current rating, ensuring electrical compatibility. Differences in forward voltage (1.0 V to 1.3 V) and recovery time (35 ns to 3 µs) do not prevent substitution but may affect circuit performance. Standard recovery diodes (S1G-13, CGRA4004-G, GS1GE-TP) are suitable for low-frequency rectification. Fast recovery diodes (ES1G, ES1G-LTP, CURA104-G) are beneficial in switching applications but are not required for simple rectification.

Q: What packaging options are available?

A: Substitute parts are supplied in Cut Tape (CT), Digi-Reel, or Tape & Reel (TR) packaging. These are standard surface mount packaging formats. Selection depends on procurement volume and assembly process requirements. All packaging formats contain the same die and are electrically identical.

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