RS1MFP Equivalent & Substitute Parts

Part Overview

The RS1MFP is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 V DC reverse voltage and 1.2 A average rectified current in a surface mount SOD-123HE package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer available or procurement is limited.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	1000 V
Current - Average Rectified (Io)	1.2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.2 A
Reverse Recovery Time (trr)	300 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V
Package / Case	SOD-123H
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RS1MFP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Parts that maintain identical electrical specifications and package form factor. These parts share the same voltage rating (1000 V), current rating (1.2 A), forward voltage (1.3 V @ 1.2 A), reverse recovery time (300 ns), reverse leakage current (5 µA @ 1000 V), and SOD-123HE package configuration. Parametric equivalents include RS1MLS RVG, RS1MLSHRVG, S1MLS RVG, and S1MLSHRVG, all manufactured by Taiwan Semiconductor Corporation.

Functional Alternatives (Performance Substitutes): Parts that meet the same voltage and current requirements but employ different technology or package form factors. The AR1PMHM3/84A from Vishay General Semiconductor operates at 1000 V with 1 A average rectified current (lower than the 1.2 A rating) and uses avalanche diode technology in a DO-220AA package. This part is suitable for applications where the lower current rating is acceptable and package footprint differences can be accommodated.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) (Max): 1000 V (required)
Current - Average Rectified (Io): 1.2 A (parametric equivalents) or ≥ 1.0 A (functional alternatives)
Package compatibility: SOD-123HE (parametric equivalents) or alternative surface mount packages (functional alternatives)
Automotive Grade and AEC-Q101 qualification (maintained across all substitutes)

Parameter Comparison

Parameter	RS1MFP (onsemi)	RS1MLS RVG (TSC)	RS1MLSHRVG (TSC)	S1MLS RVG (TSC)	S1MLSHRVG (TSC)	AR1PMHM3/84A (Vishay)
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	1.2 A	1.2 A	1.2 A	1.2 A	1.2 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.2 A	1.3 V @ 1.2 A	1.3 V @ 1.2 A	1.3 V @ 1.2 A	1.3 V @ 1.2 A	1.6 V @ 1 A
Reverse Recovery Time (trr)	300 ns	300 ns	300 ns	Not specified	Not specified	120 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	1 µA @ 1000 V
Package / Case	SOD-123H	SOD-123H	SOD-123H	SOD-123H	SOD-123H	DO-220AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
Product Status	Not For New Designs	Active	Active	Active	Active	Active
Technology	Standard	Standard	Standard	Standard	Standard	Avalanche
Grade	Automotive	Not specified	Not specified	Not specified	Not specified	Automotive
Qualification	AEC-Q101	Not specified	Not specified	Not specified	Not specified	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The Taiwan Semiconductor Corporation parts RS1MLS RVG, RS1MLSHRVG, S1MLS RVG, and S1MLSHRVG are parametric equivalents to the RS1MFP. All four parts maintain identical electrical specifications (1000 V, 1.2 A, 1.3 V forward voltage, 300 ns recovery time, 5 µA leakage) and the same SOD-123HE package form factor. These parts are currently in active production status, ensuring long-term availability. All substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1) ratings. Selection among these four equivalents should be based on inventory availability and procurement lead times.

For Functional Substitution (Performance Alternative):

The AR1PMHM3/84A from Vishay General Semiconductor is a functional alternative suitable for applications where the lower 1 A current rating is acceptable. This part maintains the 1000 V voltage rating and automotive grade with AEC-Q101 qualification. The avalanche diode technology provides superior reverse recovery characteristics (120 ns versus 300 ns) and lower reverse leakage current (1 µA versus 5 µA). The DO-220AA package differs from the SOD-123HE form factor and requires PCB layout modification. The extended operating temperature range (-55°C to 175°C versus -55°C to 150°C) provides additional thermal margin. This substitute is appropriate for new circuit designs or applications where package footprint changes are feasible.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and automotive-grade qualification where specified. The RS1MFP's "Not For New Designs" status necessitates substitution for ongoing production. Taiwan Semiconductor Corporation equivalents provide the most direct replacement path with identical package and electrical characteristics. The Vishay alternative introduces technology and package differences that require circuit validation but offer performance advantages in specific applications.

Frequently Asked Questions (FAQ)

Q: Can the Taiwan Semiconductor Corporation parts (RS1MLS RVG, RS1MLSHRVG, S1MLS RVG, S1MLSHRVG) be used interchangeably with the RS1MFP?

A: Yes. These four parts are parametric equivalents with identical voltage ratings (1000 V), current ratings (1.2 A), forward voltage characteristics (1.3 V @ 1.2 A), reverse recovery time (300 ns), reverse leakage current (5 µA @ 1000 V), and SOD-123HE package configuration. They are direct pin-compatible replacements requiring no circuit modification.

Q: What is the difference between the RS1MLS RVG and S1MLS RVG parts?

A: Both parts share identical electrical specifications and package form factors. The primary difference is the base product number designation (RS1M versus S1ML). Both are manufactured by Taiwan Semiconductor Corporation and are currently in active production. Selection between these variants should be based on supplier availability and part number preferences in existing bill-of-materials documentation.

Q: Is the AR1PMHM3/84A a direct replacement for the RS1MFP?

A: The AR1PMHM3/84A is a functional alternative, not a direct replacement. While it maintains the 1000 V voltage rating and automotive qualification, it differs in three key aspects: (1) lower current rating of 1 A versus 1.2 A, (2) different package form factor (DO-220AA versus SOD-123HE), and (3) avalanche diode technology versus standard rectifier technology. This part is suitable only for applications where the lower current rating is acceptable and PCB layout modifications are feasible.

Q: What are the inventory considerations for these substitute parts?

A: Current inventory levels are: RS1MFP (7914 pcs), RS1MLS RVG (1029 pcs), RS1MLSHRVG (1123 pcs), S1MLS RVG (842 pcs), S1MLSHRVG (873 pcs), and AR1PMHM3/84A (6200 pcs). The original RS1MFP maintains the highest inventory, but its "Not For New Designs" status indicates declining availability. Taiwan Semiconductor Corporation equivalents provide moderate inventory levels suitable for ongoing production. The Vishay alternative offers the highest inventory among functional substitutes.

Q: Are all substitute parts compliant with automotive standards?

A: The RS1MFP and AR1PMHM3/84A both carry automotive grade designation and AEC-Q101 qualification. The Taiwan Semiconductor Corporation parts (RS1MLS RVG, RS1MLSHRVG, S1MLS RVG, S1MLSHRVG) do not specify automotive grade or AEC-Q101 qualification in the provided data. All parts are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: What is the impact of the different reverse recovery times between the RS1MFP (300 ns) and AR1PMHM3/84A (120 ns)?

A: The AR1PMHM3/84A exhibits faster reverse recovery (120 ns versus 300 ns), which reduces switching losses and improves efficiency in high-frequency applications. This characteristic is inherent to avalanche diode technology. For applications operating at lower switching frequencies or where the original 300 ns recovery time was specified, the faster recovery of the Vishay part introduces a design change that requires circuit validation.

Q: Can the operating temperature range difference affect substitution decisions?

A: The RS1MFP operates from -55°C to 150°C junction temperature, while the AR1PMHM3/84A extends to -55°C to 175°C. The Taiwan Semiconductor Corporation equivalents maintain the -55°C to 150°C range. For applications operating near the upper temperature limit, the Vishay alternative provides additional thermal margin. For applications within the -55°C to 150°C range, both substitute categories are suitable.

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