RGF1G Equivalent & Substitute Parts

Part Overview

The RGF1G 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 features fast recovery characteristics with a reverse recovery time of 150 ns, making it suitable for applications requiring rapid switching performance.

The RGF1G carries a "Not For New Designs" product status, indicating that onsemi has discontinued active development and support for this part number. Organizations using this diode in active production or new circuit designs require equivalent or substitute components that maintain electrical and mechanical compatibility while offering continued availability and manufacturer support.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	µA
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RGF1G is determined by strict equivalence across the following critical parameters:

Mandatory Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC or compatible surface mount package

Performance Characteristics:

Speed classification (Fast Recovery ≤ 500ns or Standard Recovery >500ns)
Reverse Recovery Time (trr)
Forward voltage drop (Vf)
Reverse leakage current

Environmental & Compliance:

Operating Temperature Range
RoHS Status
Moisture Sensitivity Level (MSL)

Substitute parts are grouped into two categories:

Direct Equivalents – Parts with identical or superior electrical specifications, same package type, and active product status
Functional Equivalents – Parts meeting core voltage and current ratings but with different recovery characteristics or package variants

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Speed	trr	Package	Tj (Max)	Product Status
RGF1G	onsemi	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214AC (SMA)	175°C	Not For New Designs
RS1G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214AC (SMA)	150°C	Active
FS1G-LTP	Micro Commercial Co	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214AC (SMA)	150°C	Active
RGF1G-E3/5CA	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214BA (GF1)	175°C	Active
RGF1G-E3/67A	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214BA (GF1)	175°C	Active
MRA4004T3G	onsemi	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	—	DO-214AC (SMA)	175°C	Not For New Designs
NRVA4004T3G	onsemi	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	—	DO-214AC (SMA)	175°C	Not For New Designs
CFRA104-G	Comchip Technology	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-214AC (SMA)	150°C	Active
CGRA4004-G	Comchip Technology	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	—	DO-214AC (SMA)	150°C	Active
CMR1-04M BK PBFREE	Central Semiconductor Corp	400 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	—	DO-214AC (SMA)	150°C	Active
1SR156-400TE25	Rohm Semiconductor	400 V	1 A	1.3 V @ 800 mA	Fast Recovery ≤ 500ns	400 ns	DO-214AC (SMA)	150°C	Not For New Designs

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

The following parts provide electrical and mechanical equivalence to the RGF1G with active product status and full manufacturer support:

RS1G (Taiwan Semiconductor Corporation) – Identical electrical specifications, fast recovery characteristics, DO-214AC package, active product status. Operating temperature maximum of 150°C is lower than RGF1G; suitable for applications within this thermal range.
FS1G-LTP (Micro Commercial Co) – Identical electrical specifications, fast recovery characteristics, DO-214AC package, active product status. Operating temperature maximum of 150°C is lower than RGF1G; suitable for applications within this thermal range.
CFRA104-G (Comchip Technology) – Identical electrical specifications, fast recovery characteristics, DO-214AC package, active product status. Operating temperature maximum of 150°C is lower than RGF1G; suitable for applications within this thermal range.

Secondary Substitutes (Package Variant):

RGF1G-E3/5CA and RGF1G-E3/67A (Vishay General Semiconductor - Diodes Division) – Identical electrical specifications and operating temperature range to RGF1G, fast recovery characteristics. Package variant is DO-214BA (GF1) instead of DO-214AC (SMA). Requires PCB layout modification. Active product status with full manufacturer support.

Functional Alternatives (Different Recovery Characteristics):

The following parts meet voltage and current ratings but feature standard recovery characteristics (>500ns) instead of fast recovery (≤500ns):

MRA4004T3G (onsemi) – Standard recovery, lower forward voltage (1.1 V @ 1 A), DO-214AC package. Not For New Designs status.
NRVA4004T3G (onsemi) – Standard recovery, lower forward voltage (1.1 V @ 1 A), DO-214AC package, automotive grade with AEC-Q101 qualification. Not For New Designs status.
CGRA4004-G (Comchip Technology) – Standard recovery, lower forward voltage (1.1 V @ 1 A), DO-214AC package, active product status.
CMR1-04M BK PBFREE (Central Semiconductor Corp) – Standard recovery, lower forward voltage (1.1 V @ 1 A), DO-214AC package, active product status.

Selection Criteria:

If fast recovery performance (≤500ns) is required for the application, select from primary substitutes: RS1G, FS1G-LTP, or CFRA104-G.
If operating temperature must reach 175°C, select RGF1G-E3/5CA or RGF1G-E3/67A (Vishay variants) with package modification capability.
If standard recovery performance (>500ns) is acceptable and lower forward voltage is beneficial, select CGRA4004-G or CMR1-04M BK PBFREE for active product status.
All recommended substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) rating.

Frequently Asked Questions (FAQ)

Q: Can RS1G, FS1G-LTP, or CFRA104-G be used as direct drop-in replacements for RGF1G?

A: Yes. These three parts are direct drop-in replacements. They share identical electrical specifications (400 V, 1 A, 1.3 V forward voltage, 150 ns recovery time), the same DO-214AC (SMA) package, and active product status. The only difference is a lower maximum operating temperature (150°C vs. 175°C for RGF1G). Verify that your application does not require operation above 150°C junction temperature.

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

A: Fast recovery diodes have reverse recovery time ≤500ns, while standard recovery diodes exceed 500ns. Fast recovery diodes switch more rapidly, reducing switching losses in high-frequency applications. Standard recovery diodes typically exhibit lower forward voltage drop. The RGF1G is a fast recovery device (150 ns). If your circuit requires fast switching, select RS1G, FS1G-LTP, or CFRA104-G. If switching speed is not critical, standard recovery alternatives like CGRA4004-G or CMR1-04M BK PBFREE are acceptable.

Q: Can I use RGF1G-E3/5CA or RGF1G-E3/67A as replacements?

A: These Vishay parts are electrically equivalent to RGF1G and maintain the full 175°C operating temperature range. However, they use the DO-214BA (GF1) package instead of DO-214AC (SMA). Physical dimensions and PCB pad layouts differ. PCB redesign is required for these substitutes. Use only if your design can accommodate package modification.

Q: Why do some substitutes have lower forward voltage (1.1 V vs. 1.3 V)?

A: Forward voltage variation is a normal characteristic difference between manufacturers and device technologies. Lower forward voltage reduces power dissipation in the diode. If your circuit design depends on specific forward voltage characteristics, verify compatibility with the substitute part's datasheet before implementation.

Q: Are NRVA4004T3G and other automotive-grade parts suitable for non-automotive applications?

A: Yes. Automotive-grade parts (AEC-Q101 qualified) meet or exceed standard industrial specifications. NRVA4004T3G can be used in non-automotive applications. However, it features standard recovery characteristics (>500ns) rather than fast recovery, and carries "Not For New Designs" status from onsemi.

Q: What does "Not For New Designs" product status mean?

A: This designation indicates that the manufacturer has discontinued active development and support for the part. Existing inventory may be available, but the manufacturer does not recommend using this part in new circuit designs. For new designs, select parts with "Active" product status: RS1G, FS1G-LTP, CFRA104-G, RGF1G-E3/5CA, RGF1G-E3/67A, CGRA4004-G, or CMR1-04M BK PBFREE.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the RGF1G environmental and regulatory status.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, provided all selected parts meet the electrical requirements of your circuit. However, best practice is to standardize on a single substitute part number across a production run to simplify inventory management, procurement, and quality control.

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