S1AFL General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S1AFL is a general purpose rectifier diode manufactured by onsemi, rated for 50V DC reverse voltage and 1A average rectified current in a surface mount SOD-123F package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status in onsemi's product portfolio. Organizations using this diode in active production or maintenance applications require qualified substitute components that maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Mounting Type	Surface Mount	—
Package / Case	SOD-123F	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute components for the S1AFL are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50V minimum
Current - Average Rectified (Io): 1A minimum
Mounting Type: Surface Mount
Package / Case: SOD-123F or equivalent footprint
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Substitution Categories:

Parametric Equivalent: NRVS1AFL meets all primary electrical specifications identically to the S1AFL. Both components share the same voltage rating, current rating, forward voltage, reverse recovery time, and reverse leakage characteristics. The NRVS1AFL is packaged in Cut Tape (CT) & Digi-Reel® format and carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade reliability.

Similar Manufacturer Part: SM4001PL-TP from Micro Commercial Co provides functional equivalence with minor parameter variations. While maintaining the 50V/1A core ratings and SOD-123F package compatibility, this component exhibits higher reverse leakage current (5 µA versus 1 µA) and increased junction capacitance (15pF versus 4pF). The SM4001PL-TP supports an extended operating temperature range of -65°C to 175°C, providing additional thermal margin for demanding applications.

Parameter Comparison

Parameter	S1AFL (Main)	NRVS1AFL (Parametric Equivalent)	SM4001PL-TP (Similar)
Manufacturer	onsemi	onsemi	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Reverse Recovery Time (trr)	2 µs	2 µs	Not specified
Current - Reverse Leakage @ Vr	1 µA @ 50 V	1 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	4 pF @ 4V, 1MHz	4 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123F	SOD-123F	SOD-123F
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-65 to 175 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Not For New Designs	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement in Existing Designs:

NRVS1AFL is the primary substitute for S1AFL applications. Both components are manufactured by onsemi and provide identical electrical performance across all specified parameters. The NRVS1AFL carries AEC-Q101 automotive qualification, which provides additional assurance of manufacturing consistency and reliability for applications requiring automotive-grade components. Selection of NRVS1AFL is appropriate when maintaining exact electrical characteristics and onsemi sourcing is preferred.

For Applications Requiring Extended Temperature Range:

SM4001PL-TP from Micro Commercial Co extends the operating temperature range to -65°C to 175°C, compared to the S1AFL specification of -55°C to 150°C. This component is suitable for applications subject to extreme thermal environments. The higher reverse leakage current (5 µA) and increased junction capacitance (15 pF) must be evaluated against circuit requirements. SM4001PL-TP maintains SOD-123F package compatibility and ROHS3 compliance.

Compliance Considerations:

All three components are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. All components are classified as "Not For New Designs," indicating mature product status. For new design initiatives, consultation with component manufacturers regarding current-generation alternatives is recommended.

Frequently Asked Questions (FAQ)

Q: Can NRVS1AFL be used as a direct replacement for S1AFL?

A: Yes. NRVS1AFL provides parametric equivalence to S1AFL across all critical electrical specifications: 50V reverse voltage, 1A average rectified current, 1.1V forward voltage at 1A, 2µs reverse recovery time, and 1µA reverse leakage current. Both components use the SOD-123F package and operate across -55°C to 150°C. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and automotive qualification of NRVS1AFL.

Q: What are the key differences between SM4001PL-TP and S1AFL?

A: SM4001PL-TP maintains the same voltage, current, and forward voltage ratings as S1AFL. The differences are: (1) reverse leakage current is 5µA versus 1µA, (2) junction capacitance is 15pF versus 4pF, and (3) operating temperature range extends to -65°C to 175°C versus -55°C to 150°C. These differences make SM4001PL-TP suitable for high-temperature applications where the increased leakage and capacitance are acceptable.

Q: Are all substitute parts available in the same package?

A: All three components use the SOD-123F package, ensuring mechanical and footprint compatibility. Packaging formats differ: S1AFL is supplied in Tape & Reel (TR), NRVS1AFL in Cut Tape (CT) & Digi-Reel®, and SM4001PL-TP in Cut Tape (CT) & Digi-Reel®. These format differences do not affect circuit performance or PCB assembly compatibility.

Q: Which substitute should be selected for automotive applications?

A: NRVS1AFL carries AEC-Q101 automotive qualification, making it the appropriate choice for automotive applications. This qualification indicates the component meets automotive industry reliability and manufacturing standards. SM4001PL-TP does not carry specified automotive qualification in the provided data.

Q: Why is the S1AFL marked "Not For New Designs"?

A: This designation indicates the S1AFL has reached end-of-life status in onsemi's product portfolio. Existing inventory remains available for maintenance and legacy system support, but new design initiatives should evaluate current-generation alternatives from the manufacturer.

Q: Can reverse leakage current differences affect circuit performance?

A: Reverse leakage current differences between S1AFL (1µA) and SM4001PL-TP (5µA) may impact circuits with high-impedance nodes or precision analog applications. For standard rectification and power conversion applications, this difference is typically negligible. Circuit-specific analysis is required for sensitive applications.

Q: Does junction capacitance affect high-frequency performance?

A: Junction capacitance differences (4pF for S1AFL and NRVS1AFL versus 15pF for SM4001PL-TP) become significant in high-frequency switching applications. For standard 50Hz/60Hz rectification, this parameter has minimal impact. High-frequency switching circuits operating above 1MHz should account for the capacitance difference in transient analysis.

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