S2G Equivalent & Substitute Parts

Part Overview

The onsemi S2G is a surface mount rectifier diode rated for 400 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product portfolio. Applications requiring the S2G specifications necessitate evaluation of active alternative components that maintain electrical and mechanical compatibility while offering current production status and extended availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 400 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 400 V to ensure safe operation in the original application circuit.

Current Rating: The average rectified current capacity must equal or exceed 2 A. Parts rated below 2 A (such as 1 A or 1.5 A variants) are not direct substitutes and require circuit re-evaluation.

Package Compatibility: The S2G uses the DO-214AA (SMB) surface mount package. Substitutes in alternative packages (DO-214AC/SMA) require PCB layout modification and are classified as package variants rather than direct substitutes.

Recovery Characteristics: The S2G exhibits standard recovery behavior (>500 ns). Substitutes with fast recovery characteristics (≤500 ns) offer improved performance but remain functionally compatible.

Temperature Range: The S2G operates from -65°C to 150°C. Substitutes with extended temperature ranges provide additional design margin.

Product Status: Active production status ensures long-term availability and supply chain reliability compared to the obsolete S2G.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Status
S2G	onsemi	400	2	1.15 @ 2 A	2 µs	1 @ 400 V	DO-214AA (SMB)	-65 to 150	Not For New Designs
ER2G-LTP	Micro Commercial Co	400	2	1.25 @ 2 A	35 ns	5 @ 400 V	DO-214AA (SMB)	-65 to 175	Active
ES2G-13-F	Diodes Incorporated	400	2	1.25 @ 2 A	35 ns	5 @ 400 V	DO-214AA (SMB)	-55 to 150	Active
SB2G-M3/52T	Vishay General Semiconductor - Diodes Division	400	2	1.15 @ 2 A	2 µs	1 @ 400 V	DO-214AA (SMB)	-55 to 150	Active
ES2G_R1_00001	Panjit International Inc.	400	2	1.25 @ 2 A	35 ns	1 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
CMR1-04 TR13 PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	≤500 ns	10 @ 400 V	DO-214AA (SMB)	-65 to 175	Active
S2G-13-F	Diodes Incorporated	400	1.5	1.15 @ 1.5 A	>500 ns	5 @ 400 V	DO-214AA (SMB)	-65 to 150	Active
S2G-E3/52T	Vishay General Semiconductor - Diodes Division	400	1.5	1.15 @ 1.5 A	2 µs	1 @ 400 V	DO-214AA (SMB)	-55 to 150	Active
S2GA-13-F	Diodes Incorporated	400	1.5	1.15 @ 1.5 A	>500 ns	5 @ 400 V	DO-214AC (SMA)	-65 to 150	Active
STTH1R04U	STMicroelectronics	400	1	1.5 @ 1 A	30 ns	5 @ 400 V	DO-214AA (SMB)	Max 175	Active
CMR1-04 BK PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	>500 ns	10 @ 400 V	DO-214AA (SMB)	-65 to 150	Active

Engineering Selection Recommendations

Direct Substitutes (2 A Rating, DO-214AA Package):

ER2G-LTP and ES2G-13-F provide full electrical compatibility with the S2G at the 2 A current rating. Both components maintain 400 V reverse voltage rating and DO-214AA package form factor. ER2G-LTP offers extended junction temperature range to 175°C and fast recovery characteristics. ES2G-13-F provides equivalent performance with high inventory availability. Both are ROHS3 compliant and REACH unaffected.

SB2G-M3/52T from Vishay matches the S2G electrical characteristics precisely, including standard recovery time and forward voltage characteristics. This part maintains identical thermal and electrical performance parameters while offering active production status.

Package Variant Substitutes (2 A Rating, DO-214AC/SMA Package):

ES2G_R1_00001 from Panjit provides 2 A current capacity in the DO-214AC (SMA) package. This substitution requires PCB layout modification due to different package geometry. The part maintains 400 V voltage rating and offers improved reverse leakage characteristics (1 µA).

Reduced Current Alternatives (1.5 A Rating):

S2G-13-F and S2G-E3/52T provide 1.5 A current capacity in DO-214AA package. These parts are suitable only for applications where the circuit can operate at reduced current levels. S2G-E3/52T matches the S2G recovery time and forward voltage characteristics exactly.

S2GA-13-F offers 1.5 A in DO-214AC (SMA) package and requires PCB modification.

Lower Current Alternatives (1 A Rating):

CMR1-04 TR13 PBFREE and CMR1-04 BK PBFREE provide 1 A capacity. These parts are suitable only for circuits designed to operate at 1 A or lower. CMR1-04 TR13 PBFREE offers extended temperature range to 175°C and fast recovery characteristics.

STTH1R04U from STMicroelectronics provides 1 A capacity with fast recovery and 30 ns reverse recovery time. Forward voltage is elevated at 1.5 V compared to the S2G.

Compliance and Availability:

All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the S2G regulatory status. All parts carry MSL 1 (Unlimited) moisture sensitivity rating. Active production status across all substitutes ensures supply chain continuity and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 A rated diode as a substitute for the S2G 2 A diode?

A: No. The S2G is rated for 2 A average rectified current. Substituting a 1 A rated part (such as CMR1-04 or STTH1R04U) will result in component overstress and potential failure. The circuit must be re-evaluated and redesigned for the lower current rating.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: These are different surface mount package geometries. DO-214AA (SMB) and DO-214AC (SMA) have different physical dimensions and PCB pad layouts. Substituting between these packages requires PCB redesign. Parts like ES2G_R1_00001 and S2GA-13-F use SMA packaging and are not direct drop-in replacements for SMB-packaged parts.

Q: Why do some substitute parts have different forward voltage specifications?

A: Forward voltage varies based on semiconductor technology and manufacturing process. The S2G specifies 1.15 V at 2 A. Substitutes like ER2G-LTP and ES2G-13-F specify 1.25 V at 2 A. This 0.1 V difference is within typical circuit tolerance but should be verified in power dissipation calculations. Parts with significantly higher forward voltage (such as STTH1R04U at 1.5 V) generate additional heat and may require thermal re-evaluation.

Q: What does "Standard Recovery" versus "Fast Recovery" mean?

A: Recovery time describes how quickly the diode transitions from conducting to blocking state when reverse voltage is applied. The S2G exhibits standard recovery (>500 ns, 2 µs specified). Fast recovery parts (≤500 ns) switch faster and generate less switching noise. Fast recovery substitutes are functionally compatible but may alter circuit behavior in high-frequency applications.

Q: Can I use a part with a higher voltage rating than 400 V?

A: Yes. A diode rated for higher reverse voltage (such as 600 V or 1000 V) will function in a 400 V application. However, higher voltage rated parts typically have different electrical characteristics (forward voltage, capacitance, recovery time) and may not be optimal for the original circuit design. Substitution should be based on matching the specified 400 V rating unless circuit analysis confirms compatibility with higher-rated parts.

Q: Is the S2G still available for purchase?

A: The S2G is classified as "Not For New Designs" by onsemi, indicating end-of-life status. While inventory may exist in distribution channels (80,257 pcs reported in stock), long-term availability is not guaranteed. Active substitutes such as ER2G-LTP, ES2G-13-F, and SB2G-M3/52T are recommended for new designs and ongoing production.

Q: What does ROHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European Union environmental standards restricting lead, cadmium, mercury, and other hazardous substances. All listed substitutes maintain ROHS3 compliance, ensuring regulatory compatibility with the original S2G specification.

Q: Why do some parts have different reverse leakage current specifications?

A: Reverse leakage current (Ir) varies based on semiconductor material quality and manufacturing process. The S2G specifies 1 µA at 400 V. Some substitutes specify higher leakage (5 µA or 10 µA). Higher leakage increases standby power consumption and heat generation. For applications sensitive to leakage current, parts matching the S2G specification (1 µA) such as SB2G-M3/52T and ES2G_R1_00001 are preferred.

Q: Can I substitute a 1.5 A rated part in a circuit designed for 2 A?

A: No. The S2G is rated for 2 A average rectified current. Substituting a 1.5 A part (such as S2G-13-F or S2G-E3/52T) will result in component overstress if the circuit draws 2 A. The circuit must be re-evaluated and redesigned for the lower current rating, or a full 2 A substitute must be selected.

Q: What is the significance of the operating temperature range difference?

A: The S2G operates from -65°C to 150°C. Some substitutes extend to 175°C (ER2G-LTP, CMR1-04 TR13 PBFREE) or have reduced lower limits (-55°C for ES2G-13-F, SB2G-M3/52T, ES2G_R1_00001). Extended upper temperature range provides additional thermal margin in high-temperature applications. Reduced lower temperature range may limit use in extreme cold environments. Verify circuit operating conditions against the selected substitute's temperature specification.

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