S1GL RFG Equivalent & Substitute Parts

Part Overview

The S1GL RFG is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 1 A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary part number reaches end-of-life status, inventory constraints occur, or design requirements necessitate alternative qualified sources. The S1GL RFG maintains electrical and mechanical compatibility with specific alternative diode models that share identical or functionally equivalent parameters within the rectifier diode category.

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 @ 1 A	V
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	9	pF @ 4V, 1MHz
Package / Case	DO-219AB	Sub SMA
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the S1GL RFG is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Package / Case: DO-219AB (Sub SMA)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Technology: Standard

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): 1.8 µs
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 400 V

Substitute parts are grouped into two categories:

Parametric Equivalent: S1GL (Taiwan Semiconductor Corporation) — Identical electrical specifications and package, differing only in packaging format (Tape & Reel) and product status designation.

Similar Manufacturer Parts: S07G-GS08 and S07G-GS18 (Vishay General Semiconductor - Diodes Division) — Share identical reverse voltage rating, package type, and recovery characteristics. These parts operate at reduced average rectified current (700 mA versus 1 A) and feature automotive-grade qualification (AEC-Q101) with lower maximum junction temperature (150°C versus 175°C).

Parameter Comparison

Parameter	S1GL RFG (Main)	S1GL (Parametric Equivalent)	S07G-GS08 (Similar)	S07G-GS18 (Similar)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	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
Reverse Recovery Time (trr)	1.8 µs	1.8 µs	1.8 µs	1.8 µs
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	10 µA @ 400 V	10 µA @ 200 V
Capacitance @ Vr, F	9 pF @ 4V, 1MHz	9 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB
Operating Temperature - Junction	-55 to 175°C	-55 to 175°C	-55 to 150°C	-55 to 150°C
Product Status	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Standard	Standard	Automotive	Automotive
Qualification	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

S1GL (Parametric Equivalent): This part provides identical electrical and thermal performance to the S1GL RFG with full parameter matching. However, the S1GL carries a "Not For New Designs" product status designation, indicating it is in mature or declining production phase. Selection of this substitute is appropriate for legacy system maintenance, repair, or continuation of existing production runs where design changes are not feasible. The part maintains ROHS3 compliance and unlimited moisture sensitivity level.

S07G-GS08 and S07G-GS18 (Similar Manufacturer Parts): Both Vishay parts maintain Active product status and provide long-term availability assurance. These substitutes are suitable for applications where the reduced average rectified current rating (700 mA versus 1 A) does not exceed circuit requirements. The automotive-grade qualification (AEC-Q101) and lower maximum junction temperature (150°C) indicate these parts are optimized for automotive and industrial environments with stricter reliability requirements. Both parts maintain identical reverse voltage rating, package type, and recovery characteristics. Selection between S07G-GS08 and S07G-GS18 depends on specific reverse leakage current requirements at different voltage levels.

For new designs, S07G-GS08 or S07G-GS18 are preferred due to Active product status and automotive qualification. For existing designs operating at or below 700 mA average rectified current, these Vishay alternatives provide direct functional substitution with enhanced reliability certifications.

Frequently Asked Questions (FAQ)

Q: Can the S07G-GS08 or S07G-GS18 directly replace the S1GL RFG in existing circuits?

A: Direct substitution is possible if the circuit design operates at average rectified current levels of 700 mA or below. Both Vishay parts maintain identical 400 V reverse voltage rating, 1.8 µs reverse recovery time, and DO-219AB package configuration. The reduced current rating does not affect voltage or switching characteristics. Verify that your application does not require the full 1 A current capacity of the S1GL RFG before substitution.

Q: What is the difference between S07G-GS08 and S07G-GS18?

A: Both parts share identical electrical specifications and package type. The primary difference is the reverse leakage current measurement point: S07G-GS08 specifies 10 µA @ 400 V, while S07G-GS18 specifies 10 µA @ 200 V. Selection depends on whether your circuit operates primarily at 400 V or lower voltage levels. For 400 V applications, S07G-GS08 provides the specified leakage measurement at your operating voltage.

Q: Why is the S1GL marked "Not For New Designs"?

A: The "Not For New Designs" status indicates the part is in mature production phase with potential for future discontinuation. This designation does not affect the part's current functionality or compliance status. It signals that new circuit designs should consider alternative parts with Active status, such as the S07G-GS08 or S07G-GS18, to ensure long-term supply chain stability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The S1GL RFG, S1GL, S07G-GS08, and S07G-GS18 are all ROHS3 compliant with REACH Unaffected status. All parts maintain unlimited moisture sensitivity level (MSL 1), indicating no special storage or handling requirements.

Q: What is the impact of the lower maximum junction temperature (150°C) in the Vishay parts?

A: The S07G-GS08 and S07G-GS18 operate with a maximum junction temperature of 150°C compared to 175°C for the S1GL RFG. This difference affects thermal margin in high-temperature applications. If your circuit design relies on the 175°C maximum junction temperature specification, the Vishay substitutes require thermal analysis to confirm adequate margin at your maximum operating temperature.

Q: Do the Vishay parts require different PCB layout or assembly procedures?

A: No. Both S07G-GS08 and S07G-GS18 use the identical DO-219AB (Sub SMA) package as the S1GL RFG. PCB footprints, solder reflow profiles, and assembly procedures remain unchanged. Surface mount mounting type and package dimensions are identical across all substitute options.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. The S07G-GS08 and S07G-GS18 meet this qualification, indicating they have undergone rigorous testing for automotive applications including thermal cycling, vibration, and reliability verification. This qualification is not required for the S1GL RFG but provides additional assurance for mission-critical or automotive applications.

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