SF21G-AP Equivalent & Substitute Parts

Part Overview

The SF21G-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Applications requiring this diode specification necessitate identification of equivalent alternatives that maintain electrical and mechanical compatibility while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 2 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF21G-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-204AC, DO-15, Axial
Mounting Type: Through Hole
Operating Temperature - Junction: -65°C to 150°C minimum

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.1 V @ 2 A
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 50 V
RoHS3 Compliance
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts must satisfy all primary criteria and maintain compatibility within secondary parameter ranges. Recovery speed classification (Fast Recovery or Standard Recovery) does not preclude substitution when all electrical ratings and package specifications align.

Parameter Comparison

Parameter	SF21G-AP (Main)	GPP20A-E3/54	EGP20A-E3/73
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Product Status	Not For New Designs	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 2 A	1.1 V @ 2 A	950 mV @ 2 A
Speed Classification	Fast Recovery ≤ 500ns	Standard Recovery > 500ns	Fast Recovery ≤ 500ns
Reverse Recovery Time (trr)	35 ns	—	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	948 Pcs New Original In Stock	955 Pcs New Original In Stock	924 Pcs New Original In Stock

Engineering Selection Recommendations

GPP20A-E3/54 (Vishay): This substitute provides full electrical and mechanical compatibility with the SF21G-AP across all primary equivalence criteria. The GPP20A-E3/54 carries Active product status, ensuring continued manufacturer support and availability. Forward voltage specification of 1.1 V @ 2 A remains within acceptable tolerance for general-purpose rectification applications. Standard Recovery classification (> 500ns) differs from the SF21G-AP's Fast Recovery characteristic but does not compromise substitution validity when recovery speed is not a critical design parameter. Operating temperature range of -55°C to 150°C covers the majority of industrial applications, with the exception of designs requiring the full -65°C lower limit. Tape & Reel packaging offers advantages for automated assembly processes.

EGP20A-E3/73 (Vishay SUPERECTIFIER®): This substitute delivers parametric equivalence to the SF21G-AP with identical forward voltage (950 mV @ 2 A) and matching operating temperature range (-65°C to 150°C). Fast Recovery classification (≤ 500ns) and reverse recovery time of 50 ns align with the SF21G-AP's performance characteristics. Active product status and ROHS3 compliance ensure regulatory compliance and long-term availability. The EGP20A-E3/73 is suitable for applications where fast recovery performance and extended low-temperature operation are required. Capacitance specification of 70 pF @ 4V, 1MHz is provided for high-frequency circuit analysis.

Both substitutes maintain compliance with RoHS3, REACH, and MSL 1 (Unlimited) specifications. Selection between GPP20A-E3/54 and EGP20A-E3/73 depends on application-specific requirements for recovery speed, operating temperature range, and packaging format.

Frequently Asked Questions (FAQ)

Q: Can the GPP20A-E3/54 replace the SF21G-AP in all applications?

A: The GPP20A-E3/54 provides electrical and mechanical compatibility for general-purpose rectification applications. The primary difference is the operating temperature minimum of -55°C versus the SF21G-AP's -65°C. Applications operating below -55°C require the EGP20A-E3/73. Standard Recovery speed (> 500ns) differs from the SF21G-AP's Fast Recovery characteristic; applications with strict recovery time requirements should specify the EGP20A-E3/73.

Q: What is the difference between Fast Recovery and Standard Recovery classifications?

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for the diode to transition from forward conduction to reverse blocking. Fast Recovery diodes (≤ 500ns) switch faster than Standard Recovery diodes (> 500ns). The SF21G-AP specifies 35 ns (Fast Recovery), while the GPP20A-E3/54 does not provide a trr specification but is classified as Standard Recovery. The EGP20A-E3/73 specifies 50 ns (Fast Recovery). Selection depends on circuit switching frequency and performance requirements.

Q: Are the DO-15 and DO-204AC packages identical?

A: DO-15 and DO-204AC refer to the same physical package designation. DO-204AC is the formal JEDEC designation, while DO-15 is the legacy designation. All three substitute parts use this package in axial through-hole configuration and are mechanically interchangeable.

Q: What is the significance of the "Not For New Designs" status of the SF21G-AP?

A: "Not For New Designs" indicates that Micro Commercial Co has discontinued active development and promotion of this part number. While existing inventory remains available, the manufacturer recommends using alternative parts for new circuit designs. Both GPP20A-E3/54 and EGP20A-E3/73 carry Active status, indicating ongoing manufacturer support and availability.

Q: Can I use the EGP20A-E3/73 in place of the GPP20A-E3/54?

A: Yes. The EGP20A-E3/73 meets or exceeds all electrical specifications of the GPP20A-E3/54, including identical voltage ratings, current ratings, and package configuration. The EGP20A-E3/73 provides superior performance with Fast Recovery characteristics and extended low-temperature operation (-65°C minimum). No design modifications are required for this substitution.

Q: What is the difference between Tape & Box (TB) and Tape & Reel (TR) packaging?

A: Tape & Box packaging supplies components in tape format within a box container, suitable for manual or semi-automated assembly. Tape & Reel packaging supplies components on continuous reel tape, optimized for high-speed automated pick-and-place assembly equipment. Both formats contain the same component; packaging selection depends on assembly process requirements.

Q: Are all three parts RoHS3 compliant?

A: Yes. The SF21G-AP, GPP20A-E3/54, and EGP20A-E3/73 are all ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic components.

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