RSFDL Equivalent & Substitute Parts

Part Overview

The RSFDL is a general-purpose fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200V DC reverse voltage and 500mA average rectified current in a Sub SMA surface mount package (DO-219AB). The device features a 150ns reverse recovery time and is compliant with RoHS3 and REACH standards.

The RSFDL carries a product status designation of "Not For New Designs," indicating that this component is obsolete or in end-of-life phase. Identification of equivalent and substitute parts is necessary for design continuity, production support, and legacy system maintenance where the original RSFDL specification must be maintained or where compatible alternatives are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 500 mA	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 200 V	µA
Capacitance @ Vr, F	4 @ 4V, 1MHz	pF
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-219AB	Sub SMA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Parametric Equivalents (Full Compatibility): Parts that maintain identical electrical specifications across all critical parameters including voltage rating (200V), current rating (500mA), forward voltage (1.3V @ 500mA), reverse recovery time (150ns), reverse leakage current (5µA @ 200V), and junction temperature range (-55°C to 150°C). These parts are packaged in the same DO-219AB Sub SMA case and are direct replacements. This category includes RSFDL M2G, RSFDL MHG, RSFDL MQG, RSFDL MTG, RSFDL R3G, RSFDL RFG, RSFDL RHG, RSFDL RQG, and RSFDL RTG.

Manufacturer Recommended Substitute (Functional Upgrade): The RS1DLW represents a higher-current variant rated for 1A average rectified current while maintaining the same 200V reverse voltage rating, 150ns reverse recovery time, and 1.3V forward voltage specification. This part is packaged in SOD-123W and operates across an extended junction temperature range (-55°C to 175°C). The RS1DLW is suitable for applications where increased current capacity is acceptable and package transition is feasible.

Substitution eligibility is determined by matching the following critical parameters: DC reverse voltage (200V), reverse recovery time (150ns), forward voltage characteristic (1.3V), reverse leakage current (5µA @ 200V), and compliance certifications (RoHS3, REACH Unaffected).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Tj (Operating)	Product Status	Inventory
RSFDL	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Not For New Designs	13300 Pcs
RS1DLW	Taiwan Semiconductor Corporation	200 V	1 A	1.3 V @ 1 A	150 ns	5 µA @ 200 V	SOD-123W	-55°C ~ 175°C	Active	20909 Pcs
RSFDL M2G	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	806 Pcs
RSFDL MHG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	1051 Pcs
RSFDL MQG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	775 Pcs
RSFDL MTG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	879 Pcs
RSFDL R3G	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	725 Pcs
RSFDL RFG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	803 Pcs
RSFDL RHG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	1044 Pcs
RSFDL RQG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	941 Pcs
RSFDL RTG	Taiwan Semiconductor Corporation	200 V	500 mA	1.3 V @ 500 mA	150 ns	5 µA @ 200 V	DO-219AB (Sub SMA)	-55°C ~ 150°C	Active	983 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select from the parametric equivalent parts RSFDL M2G, RSFDL MHG, RSFDL MQG, RSFDL MTG, RSFDL R3G, RSFDL RFG, RSFDL RHG, RSFDL RQG, or RSFDL RTG. All these parts maintain full electrical and mechanical compatibility with the original RSFDL specification. All parametric equivalents carry Active product status and are RoHS3 compliant with REACH Unaffected designation. Selection among these variants may be based on packaging format (Tape & Reel or Cut Tape) and current inventory availability.

For Higher Current Applications: The RS1DLW manufacturer-recommended substitute is suitable when the application circuit can accommodate a 1A-rated device in place of the 500mA original specification. The RS1DLW maintains the same 200V reverse voltage rating, 150ns reverse recovery time, and 1.3V forward voltage characteristic. This part operates across an extended junction temperature range (-55°C to 175°C) compared to the RSFDL (-55°C to 150°C). The RS1DLW is packaged in SOD-123W, which differs from the original DO-219AB Sub SMA package and requires PCB layout modification. The RS1DLW carries Active product status with RoHS3 compliance and REACH Unaffected designation.

Compliance Considerations: All substitute parts listed maintain RoHS3 compliance and REACH Unaffected status consistent with the original RSFDL. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can RSFDL M2G, RSFDL MHG, RSFDL MQG, RSFDL MTG, RSFDL R3G, RSFDL RFG, RSFDL RHG, RSFDL RQG, and RSFDL RTG be used interchangeably with the original RSFDL?

A: Yes. These parametric equivalent parts maintain identical electrical specifications including 200V reverse voltage rating, 500mA average rectified current, 1.3V forward voltage at 500mA, 150ns reverse recovery time, and 5µA reverse leakage current at 200V. All are packaged in DO-219AB Sub SMA and operate across the same junction temperature range (-55°C to 150°C). These parts are direct functional replacements.

Q: What is the difference between the parametric equivalents and the RS1DLW?

A: The RS1DLW is rated for 1A average rectified current compared to 500mA for the RSFDL and its parametric equivalents. While the RS1DLW maintains the same 200V reverse voltage, 150ns reverse recovery time, and 1.3V forward voltage specification, it is packaged in SOD-123W rather than DO-219AB Sub SMA. The RS1DLW also operates across an extended temperature range (-55°C to 175°C). The RS1DLW is suitable for applications requiring higher current capacity where package transition is acceptable.

Q: Are there packaging differences among the parametric equivalent parts?

A: The parametric equivalent parts are primarily available in Tape & Reel (TR) or Cut Tape (CT) packaging formats. RSFDL R3G is specified as Cut Tape. The remaining parametric equivalents (RSFDL M2G, RSFDL MHG, RSFDL MQG, RSFDL MTG, RSFDL RFG, RSFDL RHG, RSFDL RQG, RSFDL RTG) do not specify packaging format in the provided data. All parametric equivalents use the same DO-219AB Sub SMA component package for surface mount assembly.

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

A: The "Not For New Designs" status indicates that the RSFDL is in end-of-life phase and is no longer recommended for new product development. Active parametric equivalent parts such as RSFDL M2G, RSFDL MHG, RSFDL MQG, RSFDL MTG, RSFDL R3G, RSFDL RFG, RSFDL RHG, RSFDL RQG, and RSFDL RTG should be used for new designs while maintaining the same electrical and mechanical specifications.

Q: Do all substitute parts meet the same compliance standards as the original RSFDL?

A: Yes. All parametric equivalent parts and the RS1DLW substitute maintain RoHS3 compliance and REACH Unaffected status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating identical moisture handling requirements.

Q: What inventory levels are available for each substitute part?

A: Parametric equivalent parts have varying inventory levels: RSFDL M2G (806 Pcs), RSFDL MHG (1051 Pcs), RSFDL MQG (775 Pcs), RSFDL MTG (879 Pcs), RSFDL R3G (725 Pcs), RSFDL RFG (803 Pcs), RSFDL RHG (1044 Pcs), RSFDL RQG (941 Pcs), and RSFDL RTG (983 Pcs). The RS1DLW substitute has higher availability at 20909 Pcs. The original RSFDL has 13300 Pcs in stock.

Q: Can the RS1DLW be used in all applications where the RSFDL is specified?

A: The RS1DLW can be used in applications where the circuit design accommodates a 1A-rated device and where the SOD-123W package footprint is compatible with the PCB layout. The RS1DLW maintains the same reverse voltage rating (200V), reverse recovery time (150ns), and forward voltage characteristic (1.3V). Applications limited to 500mA operation do not require the higher current rating of the RS1DLW, but the part will function correctly in such circuits.

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

A: Reverse recovery time (trr) is 150ns for the RSFDL and all listed substitute parts. This parameter defines the time required for the diode to switch from forward conduction to reverse blocking when the applied voltage reverses polarity. The 150ns specification is consistent across all substitutes, ensuring equivalent switching performance in fast recovery rectifier applications.

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