RSFGL Equivalent & Substitute Parts

Part Overview

The RSFGL is a general-purpose fast recovery diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 500 mA average rectified current. The device is packaged in Sub SMA (DO-219AB) surface mount configuration with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring fast switching characteristics.

The RSFGL carries a product status of "Not For New Designs," indicating that while the part remains available in inventory, it is no longer recommended for new circuit development. Identification of equivalent and substitute parts is necessary to support legacy system maintenance, repair operations, and to facilitate migration to active product alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	400	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) Maximum @ If	1.3 V @ 500 mA	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	4	pF @ 4V, 1MHz
Package / Case	DO-219AB	Sub SMA
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RSFGL are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Same Electrical Specifications, Same Package): Parts that maintain identical electrical ratings and package configuration are classified as parametric equivalents. These parts share the following critical parameters with the RSFGL:

Voltage - DC Reverse (Vr): 400 V
Current - Average Rectified (Io): 500 mA
Voltage - Forward (Vf): 1.3 V @ 500 mA
Reverse Recovery Time (trr): 150 ns
Current - Reverse Leakage: 5 µA @ 400 V
Capacitance: 4 pF @ 4V, 1MHz
Package / Case: DO-219AB (Sub SMA)
Operating Temperature Range: -55°C to 150°C

Parametric equivalent parts include: RSFGL M2G, RSFGL MHG, RSFGL MQG, RSFGL MTG, RSFGL RFG, RSFGL RHG, RSFGL RQG, RSFGL RTG, and RSFGL RUG. These variants differ only in manufacturing date codes or internal process revisions and are interchangeable in circuit applications.

Functional Equivalent (Different Current Rating, Different Package): The RS1GLW is classified as a functional equivalent with modified electrical specifications. This part maintains the same 400 V reverse voltage rating and fast recovery characteristics but increases the average rectified current to 1 A and uses a different surface mount package (SOD-123W). The RS1GLW is suitable for applications requiring higher current capacity while maintaining the same voltage class and switching speed characteristics.

Parameter Comparison

Parameter	RSFGL	RSFGL M2G	RSFGL MHG	RSFGL MQG	RSFGL MTG	RSFGL RFG	RSFGL RHG	RSFGL RQG	RSFGL RTG	RSFGL RUG	RS1GLW
Voltage - DC Reverse (Vr) Max	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	500 mA	1 A
Voltage - Forward (Vf) Max @ If	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 500 mA	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	Not Specified
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	SOD-123W
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 175°C
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The parametric equivalent parts RSFGL M2G, RSFGL MHG, RSFGL MQG, RSFGL MTG, RSFGL RFG, RSFGL RHG, RSFGL RQG, RSFGL RTG, and RSFGL RUG are direct replacements for the RSFGL. All variants maintain identical electrical specifications, package configuration, and operating temperature range. These parts carry Active product status and are ROHS3 compliant, making them suitable for both legacy system support and new production runs. Selection among these variants is based on inventory availability and manufacturing date code requirements.

For Functional Substitution (Higher Current Capacity):

The RS1GLW is suitable for applications where the RSFGL current rating of 500 mA is insufficient. The RS1GLW increases average rectified current to 1 A while maintaining the same 400 V reverse voltage rating and 150 ns reverse recovery time. The RS1GLW uses a different surface mount package (SOD-123W) and extends the operating temperature range to 175°C. Circuit board layout modifications are required to accommodate the different package footprint. The RS1GLW carries Active product status and is ROHS3 compliant.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. All parts are manufactured by Taiwan Semiconductor Corporation and carry EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can RSFGL M2G, RSFGL MHG, RSFGL MQG, RSFGL MTG, RSFGL RFG, RSFGL RHG, RSFGL RQG, RSFGL RTG, and RSFGL RUG be used interchangeably with the RSFGL?

A: Yes. These parts are parametric equivalents with identical electrical specifications, package configuration (DO-219AB Sub SMA), and operating temperature range (-55°C to 150°C). No circuit modifications are required for substitution. The variants differ only in manufacturing process revisions or date codes.

Q: What is the primary difference between the RSFGL and RS1GLW?

A: The RS1GLW increases average rectified current from 500 mA to 1 A and uses a different surface mount package (SOD-123W instead of DO-219AB Sub SMA). The RS1GLW also extends the maximum operating junction temperature to 175°C. Both parts maintain the same 400 V reverse voltage rating and 150 ns reverse recovery time.

Q: Is the RS1GLW a direct replacement for the RSFGL in existing circuit boards?

A: No. The RS1GLW uses a different package footprint (SOD-123W) compared to the RSFGL (DO-219AB Sub SMA). Circuit board layout modifications are required to accommodate the different package dimensions and pad configuration.

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

A: The RSFGL product status indicates that while the part remains available in inventory for legacy system support and repair, Taiwan Semiconductor Corporation no longer recommends its use in new circuit development. The parametric equivalent variants (RSFGL M2G, RSFGL MHG, RSFGL MQG, RSFGL MTG, RSFGL RFG, RSFGL RHG, RSFGL RQG, RSFGL RTG, RSFGL RUG) carry Active status and are recommended for new designs requiring identical electrical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed, including the parametric equivalents and the RS1GLW, are ROHS3 compliant and carry MSL rating of 1 (Unlimited).

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters for substitution are: Voltage - DC Reverse (Vr) Maximum, Current - Average Rectified (Io), Voltage - Forward (Vf) at rated current, Reverse Recovery Time (trr), and Current - Reverse Leakage at rated voltage. For parametric equivalents, all these parameters must match exactly. For functional substitutes like the RS1GLW, the voltage and switching speed characteristics remain constant while current capacity increases.

Q: Can the RSFGL be used in applications requiring higher current than 500 mA?

A: No. The RSFGL is rated for maximum average rectified current of 500 mA. For applications requiring higher current capacity, the RS1GLW (rated for 1 A) is a suitable functional substitute, provided the different package footprint can be accommodated in the circuit board design.

Q: What is the reverse recovery time specification and why is it important?

A: Reverse recovery time (trr) is 150 ns for both the RSFGL and all substitute parts. This parameter defines the time required for the diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast recovery characteristics (≤500 ns for currents >200 mA) are maintained across all substitute parts, ensuring compatibility in switching applications.

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