FR1G Equivalent & Substitute Parts

Part Overview

The FR1G is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as a fast recovery diode with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring rapid switching characteristics.

The FR1G maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching the 400 V voltage rating and DO-214AA package form factor while accommodating variations in current capacity and recovery speed characteristics.

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
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FR1G are qualified based on the following criteria:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Technology: Standard rectifier diode

Variable Parameters Allowing Substitution:

Current - Average Rectified (Io): Substitutes with equal or higher current rating are acceptable
Reverse Recovery Time (trr): Substitutes with equal or slower recovery characteristics are acceptable
Forward Voltage (Vf): Substitutes with equal or lower forward voltage are acceptable
Operating Temperature Range: Substitutes with equal or wider temperature range are acceptable

The identified substitutes S2G and S5GB maintain the 400 V voltage rating and DO-214AA package specification. Both are surface mount rectifier diodes with standard technology classification. Current ratings differ (2 A for S2G, 5 A for S5GB) compared to the 1 A rating of FR1G, representing higher current capacity options. Recovery speed characteristics vary between fast recovery (FR1G at 150 ns) and standard recovery (S2G and S5GB at >500 ns).

Parameter Comparison

Parameter	FR1G (Main)	S2G (Substitute)	S5GB (Substitute)
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	2 A	5 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.15 V @ 2 A	1.1 V @ 5 A
Speed Classification	Fast Recovery ≤ 500ns	Standard Recovery >500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	150 ns	1.5 µs	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 400 V	1 µA @ 400 V	10 µA @ 400 V
Capacitance @ Vr, F	10 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-50 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)

Engineering Selection Recommendations

FR1G (Primary Selection): The FR1G maintains Active product status with full inventory availability (205,200 pcs). This component is the preferred selection for applications requiring fast recovery characteristics (150 ns trr) at 1 A current rating. RoHS3 compliance and unlimited moisture sensitivity rating support standard manufacturing and storage conditions.

S5GB (Recommended Substitute): The S5GB is the primary substitute option, maintaining Active product status with 4,433 pcs in inventory. This component provides higher current capacity (5 A) within the same 400 V voltage class and DO-214AA package. The S5GB is suitable for applications where the FR1G is unavailable and higher current handling is acceptable. RoHS3 compliance and wider operating temperature range (-55 to 150°C) provide equivalent environmental qualification. Standard recovery speed (>500 ns) differs from the FR1G's fast recovery characteristic.

S2G (Secondary Substitute): The S2G is classified as Discontinued at DiGi Electronics and carries reduced inventory (3,615 pcs). This component provides intermediate current capacity (2 A) and lower forward voltage (1.15 V @ 2 A) compared to the FR1G. The S2G is suitable only when S5GB is unavailable and application current requirements do not exceed 2 A. Discontinuation status limits long-term availability for production applications.

Frequently Asked Questions (FAQ)

Q: Can S2G or S5GB be used as direct replacements for FR1G in existing designs?

A: S2G and S5GB are electrically compatible substitutes within the 400 V voltage class and DO-214AA package specification. Both maintain surface mount configuration and RoHS3 compliance. However, recovery speed differs: FR1G operates as fast recovery (150 ns), while S2G and S5GB operate as standard recovery (>500 ns). Applications sensitive to switching speed or EMI characteristics must evaluate this difference. Current ratings are higher (2 A and 5 A respectively) compared to FR1G (1 A), which is acceptable in most rectification circuits.

Q: What is the impact of different current ratings on substitution?

A: The FR1G is rated for 1 A average rectified current. S2G (2 A) and S5GB (5 A) provide higher current capacity. In applications where the circuit draws less than 1 A, either substitute operates within safe limits. In applications requiring exactly 1 A, the higher-rated substitutes provide additional margin. Thermal management and PCB layout remain unchanged due to identical DO-214AA package dimensions.

Q: Are there packaging differences between FR1G and the substitutes?

A: FR1G is supplied in Tape & Reel (TR) packaging. S2G is supplied in Cut Tape (CT) packaging, while S5GB is supplied in Tape & Reel (TR). Both packaging formats are compatible with standard surface mount assembly equipment. Cut Tape format may require different feeder configuration on pick-and-place machines compared to Tape & Reel format.

Q: What is the significance of reverse recovery time differences?

A: FR1G exhibits fast recovery characteristics with 150 ns reverse recovery time. S2G specifies 1.5 µs reverse recovery time. S5GB does not specify reverse recovery time but is classified as standard recovery (>500 ns). Fast recovery diodes minimize reverse current spikes during switching transitions, reducing EMI and improving efficiency in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification where switching speed is less critical.

Q: How do forward voltage differences affect circuit performance?

A: FR1G specifies 1.3 V forward voltage at 1 A. S2G specifies 1.15 V at 2 A, and S5GB specifies 1.1 V at 5 A. Lower forward voltage reduces power dissipation in the diode. In low-voltage applications, this difference may be significant. In high-voltage applications (400 V), the forward voltage drop represents a smaller percentage of total circuit voltage and has minimal impact on overall performance.

Q: What is the product status impact on long-term availability?

A: FR1G maintains Active status with 205,200 pcs in stock, supporting continuous production requirements. S5GB is Active with 4,433 pcs available. S2G is Discontinued at DiGi Electronics with 3,615 pcs remaining inventory. For new designs or long-term production, FR1G or S5GB are preferred. S2G should be considered only for short-term requirements or when other options are exhausted.

Q: Are there compliance or regulatory differences between these parts?

A: All three components (FR1G, S2G, S5GB) are RoHS3 compliant and carry ECCN classification EAR99. FR1G is REACH Affected, while S2G and S5GB are REACH Unaffected. For applications subject to REACH regulations, this distinction may require evaluation. All components carry HTSUS classification 8541.10.0080 and unlimited moisture sensitivity rating (MSL 1).

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