RSFAL Equivalent & Substitute Parts

Part Overview

The RSFAL is a general-purpose fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 500 mA average rectified current in a Sub SMA surface mount package (DO-219AB). The device features a 150 ns reverse recovery time and is compliant with RoHS3 and REACH standards.

The RSFAL carries a product status designation of "Not For New Designs," indicating that while the part remains available in inventory, it is no longer recommended for new circuit development. This status necessitates identification of equivalent and substitute components that maintain functional compatibility while offering active product status or enhanced electrical characteristics for ongoing applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	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 @ 50 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 RSFAL are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Same Electrical Ratings): Parts that maintain identical voltage, current, and thermal specifications while differing only in manufacturing date code or internal process revision. These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Substitute (Enhanced Ratings): Parts that exceed the original specifications in voltage or current capacity while maintaining backward compatibility through equal or superior electrical characteristics.

The substitution logic is based on the following critical parameters:

Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 50 V
Current - Average Rectified (Io): Substitute must equal or exceed 500 mA
Reverse Recovery Time (trr): Substitute must equal or be faster than 150 ns
Voltage - Forward (Vf) (Max): Substitute must equal or be lower than 1.3 V at rated current
Package / Case: Substitute must be compatible with surface mount assembly processes
Operating Temperature Range: Substitute must cover or exceed -55°C to 150°C

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	trr	Package	Product Status	Inventory
RSFAL	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Not For New Designs	9885 Pcs
RSFAL M2G	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	969 Pcs
RSFAL MHG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	685 Pcs
RSFAL MQG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	637 Pcs
RSFAL MTG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	889 Pcs
RSFAL RFG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	726 Pcs
RSFAL RHG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	874 Pcs
RSFAL RQG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	966 Pcs
RSFAL RTG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	630 Pcs
RSFAL RUG	Taiwan Semiconductor Corporation	50 V	500 mA	1.3 V @ 500 mA	150 ns	DO-219AB (Sub SMA)	Active	681 Pcs
RS1DLW	Taiwan Semiconductor Corporation	200 V	1 A	1.3 V @ 1 A	150 ns	SOD-123W	Active	20909 Pcs

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The RSFAL M2G, RSFAL MHG, RSFAL MQG, RSFAL MTG, RSFAL RFG, RSFAL RHG, RSFAL RQG, RSFAL RTG, and RSFAL RUG are parametric equivalents of the RSFAL. These parts maintain identical electrical specifications and package configuration while carrying Active product status. Selection among these equivalents is based on manufacturing date code availability and inventory levels. All equivalents are RoHS3 compliant with MSL 1 (Unlimited) rating.

For Enhanced Performance (Manufacturer Recommended Substitute):

The RS1DLW is designated as the manufacturer recommended substitute. This part provides enhanced voltage rating (200 V versus 50 V) and increased current capacity (1 A versus 500 mA) while maintaining the same 150 ns reverse recovery time and 1.3 V forward voltage characteristic. 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 and is RoHS3 compliant with MSL 1 (Unlimited) rating. This substitute is suitable for applications requiring higher voltage or current margins.

Compliance Considerations:

All substitute parts maintain RoHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard surface mount assembly and storage protocols.

Frequently Asked Questions (FAQ)

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

A: Yes. These parts are parametric equivalents with identical voltage, current, and thermal specifications. They are direct functional replacements requiring no circuit modification. The differences are limited to manufacturing date codes and internal process revisions.

Q: What is the primary advantage of using RSFAL M2G or other parametric equivalents over the original RSFAL?

A: The parametric equivalents carry Active product status, whereas the RSFAL is designated "Not For New Designs." For ongoing production and new circuit development, Active status parts are preferred to ensure long-term availability and manufacturer support.

Q: Can RS1DLW replace RSFAL in all applications?

A: RS1DLW provides enhanced electrical specifications (200 V reverse voltage and 1 A current capacity) and is electrically backward compatible with RSFAL in circuits operating at or below 50 V and 500 mA. However, the package change from DO-219AB (Sub SMA) to SOD-123W requires PCB layout redesign and requalification of assembly processes.

Q: What is the difference between DO-219AB (Sub SMA) and SOD-123W packages?

A: DO-219AB (Sub SMA) and SOD-123W are distinct surface mount packages with different footprints, lead configurations, and thermal characteristics. Direct physical substitution is not possible without PCB redesign. Consult package datasheets for specific dimensional and electrical interface requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed, including RSFAL M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG, RUG, and RS1DLW, are RoHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is MSL 1 (Unlimited) moisture sensitivity rating?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. The part can be stored and handled under standard industrial conditions without special desiccant packaging or shelf-life limitations.

Q: Which substitute part should be selected for new circuit designs?

A: For new designs requiring identical electrical and package specifications, select any of the parametric equivalents (RSFAL M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG, or RUG) based on availability and lead time. For applications requiring higher voltage or current margins with package redesign capability, RS1DLW is the manufacturer recommended option.

Q: Is the reverse recovery time identical across all substitute parts?

A: Yes. All substitute parts, including parametric equivalents and RS1DLW, maintain a 150 ns reverse recovery time, ensuring consistent switching performance in fast recovery rectifier applications.

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