RS1AL Equivalent & Substitute Parts

Part Overview

The RS1AL is a general-purpose fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 800 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 applications requiring fast switching characteristics.

The RS1AL carries a product status of "Not For New Designs," indicating that while the component remains in inventory, Taiwan Semiconductor Corporation does not recommend its use in new circuit designs. This status necessitates identification of equivalent and substitute components that maintain functional compatibility while offering active product status or enhanced electrical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	800	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 800 mA	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 50 V	µA
Capacitance @ Vr, F	10 @ 4V, 1MHz	pF
Package / Case	DO-219AB	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the RS1AL are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Active Status): Parts RS1AL M2G, RS1AL MHG, RS1AL MQG, RS1AL MTG, RS1AL RFG, RS1AL RHG, RS1AL RQG, RS1AL RTG, and RS1AL RUG are parametric equivalents that maintain identical electrical specifications to the RS1AL across all critical parameters: 50 V reverse voltage rating, 800 mA average rectified current, 1.3 V forward voltage drop at 800 mA, 150 ns reverse recovery time, 5 µA reverse leakage current at 50 V, and 10 pF capacitance at 4 V and 1 MHz. These parts are packaged identically in DO-219AB Sub SMA configuration and operate across the same temperature range (-55°C to 150°C). The primary distinction is product status: all parametric equivalents carry "Active" status, whereas the RS1AL is marked "Not For New Designs." These variants differ only in manufacturing date codes or internal process revisions, indicated by their suffix designations (M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG, RUG).

Functional Substitute (Enhanced Specifications): Part RS1DLW is a functional substitute that exceeds the electrical specifications of the RS1AL. While the RS1DLW operates at a higher reverse voltage rating (200 V versus 50 V) and higher current rating (1 A versus 800 mA), it maintains the same 150 ns reverse recovery time and fast recovery speed classification. The RS1DLW is packaged in SOD-123W surface mount configuration rather than Sub SMA, requiring PCB layout modification. The RS1DLW operates across an extended temperature range (-55°C to 175°C) and carries "Active" product status. This substitute is applicable only when circuit design permits package change and can accommodate the higher voltage and current ratings.

Parameter Comparison

Parameter	RS1AL	RS1AL M2G	RS1AL MHG	RS1AL MQG	RS1AL MTG	RS1AL RFG	RS1AL RHG	RS1AL RQG	RS1AL RTG	RS1AL RUG	RS1DLW
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	50 V	200 V
Current - Average Rectified (Io)	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 mA	1.3 V @ 800 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 @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 200 V
Capacitance @ Vr, F	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 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 (Identical Specifications and Package): Select any of the parametric equivalent parts—RS1AL M2G, RS1AL MHG, RS1AL MQG, RS1AL MTG, RS1AL RFG, RS1AL RHG, RS1AL RQG, RS1AL RTG, or RS1AL RUG—when the circuit design requires a 50 V, 800 mA fast recovery rectifier diode in DO-219AB Sub SMA packaging. All parametric equivalents maintain identical electrical performance and thermal characteristics to the RS1AL while carrying "Active" product status. These parts are suitable for new designs and provide continuity with existing PCB layouts and assembly processes. Selection among these variants may be based on inventory availability or manufacturing date code requirements.

For Enhanced Voltage and Current Capability: Select RS1DLW when the circuit design permits package change from DO-219AB Sub SMA to SOD-123W and when the application benefits from higher voltage (200 V) and current (1 A) ratings. The RS1DLW maintains the same 150 ns reverse recovery time and fast recovery speed classification, ensuring switching performance compatibility. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin compared to the RS1AL. This substitute is applicable in applications where reverse voltage transients or current surges exceed the RS1AL ratings, or where design margin improvement is required. PCB layout modification is mandatory due to package geometry differences.

Both substitute categories comply with ROHS3 and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can RS1AL parametric equivalents be used as direct drop-in replacements?

A: Yes. Parts RS1AL M2G, RS1AL MHG, RS1AL MQG, RS1AL MTG, RS1AL RFG, RS1AL RHG, RS1AL RQG, RS1AL RTG, and RS1AL RUG are direct drop-in replacements for the RS1AL. All maintain identical electrical specifications (50 V reverse voltage, 800 mA current, 1.3 V forward voltage, 150 ns recovery time), identical packaging (DO-219AB Sub SMA), and identical operating temperature range (-55°C to 150°C). No PCB modifications are required.

Q: What is the primary difference between the RS1AL and its parametric equivalents?

A: The primary difference is product status. The RS1AL is marked "Not For New Designs," while all parametric equivalents carry "Active" status. Electrically and mechanically, the parts are identical. The suffix designations (M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG, RUG) indicate different manufacturing date codes or internal process revisions from Taiwan Semiconductor Corporation.

Q: When should RS1DLW be selected instead of parametric equivalents?

A: RS1DLW should be selected when the circuit design requires higher reverse voltage capability (200 V versus 50 V) or higher current handling (1 A versus 800 mA), or when extended operating temperature range (-55°C to 175°C) is beneficial. RS1DLW is not a direct replacement due to package change from DO-219AB Sub SMA to SOD-123W, requiring PCB layout modification.

Q: Are there any compliance or certification differences between RS1AL and its substitutes?

A: No. All substitute parts maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected, MSL 1 (Unlimited), and ECCN EAR99. Regulatory and environmental compliance is consistent across all parts.

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

A: Reverse recovery time (trr) is 150 ns for all listed parts. This parameter defines the time required for the diode to transition from forward conduction to reverse blocking when the applied voltage reverses. All substitute parts maintain this specification, ensuring switching speed compatibility in fast recovery applications.

Q: Can RS1AL parametric equivalents be mixed in the same circuit or assembly?

A: Yes. All parametric equivalents (RS1AL M2G, RS1AL MHG, RS1AL MQG, RS1AL MTG, RS1AL RFG, RS1AL RHG, RS1AL RQG, RS1AL RTG, RS1AL RUG) are electrically and mechanically identical and can be used interchangeably within the same circuit or assembly without performance degradation.

Q: What packaging considerations apply to RS1DLW substitution?

A: RS1DLW uses SOD-123W packaging, which differs from the RS1AL's DO-219AB Sub SMA package. SOD-123W has different lead geometry and footprint dimensions. PCB redesign is required, including pad layout modification, trace routing adjustment, and assembly process validation. This substitute is not suitable for applications requiring identical PCB footprints.

Q: Are all substitute parts available in the same tape and reel packaging?

A: Parametric equivalents (RS1AL M2G through RS1AL RUG) do not specify packaging format in the provided data. RS1AL is supplied in Tape & Reel (TR) format with 18,660 pieces in stock. RS1DLW is supplied in Tape & Reel (TR) format with 20,909 pieces in stock. Confirm packaging format with the supplier for specific procurement requirements.

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