SF28-AP Equivalent & Substitute Parts

Part Overview

The SF28-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole package. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity. The SF28-AP employs standard rectifier technology with fast recovery characteristics suitable for general rectification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55°C ~ 125°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF28-AP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Through Hole
Package / Case: DO-15 or DO-204AC (equivalent axial packages)
Technology: Standard rectifier diode

Secondary Compatibility Factors:

Reverse Recovery Time (trr): ≤ 500 ns (fast recovery classification)
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 600 V
RoHS Compliance: ROHS3 Compliant

Substitute parts must meet or exceed all primary criteria. Variations in forward voltage (Vf), reverse recovery time, and operating temperature range are permissible provided the part remains functionally equivalent within the application's design margins. Product status (active vs. obsolete) and packaging format (bulk vs. tape & box) do not affect electrical substitutability.

Parameter Comparison

Parameter	SF28-AP (Main)	SF28G-AP (Direct)	HER206G A0G (Similar)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 2 A	1.7 V @ 2 A	1.7 V @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	35 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	871 Pcs New Original In Stock	728 Pcs New Original In Stock	863 Pcs New Original In Stock

Engineering Selection Recommendations

SF28G-AP (Direct Substitute - Recommended Primary Choice)

The SF28G-AP is the direct equivalent substitute for the SF28-AP. Both parts share identical base product number (SF28) and are manufactured by Micro Commercial Co. The SF28G-AP is currently in active product status, ensuring long-term availability and supply chain stability. Electrical parameters are equivalent across all critical specifications: 600 V reverse voltage, 2 A average rectified current, 35 ns reverse recovery time, and 5 µA reverse leakage current. The SF28G-AP features an extended operating temperature range (-65°C ~ 150°C versus -55°C ~ 125°C), providing superior thermal performance. Forward voltage is slightly elevated (1.7 V versus 1.3 V @ 2 A), which is within acceptable design margins for general-purpose rectification. The SF28G-AP is supplied in Tape & Box packaging format and maintains ROHS3 compliance.

HER206G A0G (Alternative Substitute - Cross-Manufacturer Option)

The HER206G A0G, manufactured by Taiwan Semiconductor Corporation, provides an alternative substitute when SF28G-AP availability is constrained. This part meets all primary substitution criteria: 600 V reverse voltage, 2 A average rectified current, through-hole mounting, and DO-204AC (DO-15) package compatibility. Electrical performance is equivalent to the SF28G-AP with 1.7 V forward voltage and 5 µA reverse leakage current. The HER206G A0G exhibits a longer reverse recovery time (75 ns versus 35 ns), which remains within fast recovery classification but may introduce marginally higher switching losses in high-frequency applications. Capacitance is lower (20 pF versus 30 pF), which may provide benefits in certain circuit topologies. Operating temperature range extends to -55°C ~ 150°C. The HER206G A0G is active in production and ROHS3 compliant.

Selection Basis:

Both substitute parts are active products with established supply chains, addressing the obsolescence of the SF28-AP. The SF28G-AP is the preferred choice due to direct manufacturer equivalence and identical reverse recovery time. The HER206G A0G serves as a secondary option when cross-manufacturer sourcing is required. Both substitutes maintain compliance with RoHS3 and support equivalent through-hole assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SF28G-AP be used as a direct replacement for the SF28-AP without circuit modification?

A: Yes. The SF28G-AP is electrically and mechanically equivalent to the SF28-AP across all critical parameters: 600 V reverse voltage, 2 A average rectified current, 35 ns reverse recovery time, and identical DO-15 through-hole package. The forward voltage increase from 1.3 V to 1.7 V is within acceptable design margins for general-purpose rectification applications and does not require circuit redesign.

Q: What is the difference between the SF28G-AP and HER206G A0G?

A: Both parts meet the primary substitution criteria for the SF28-AP. The key difference is reverse recovery time: SF28G-AP has 35 ns while HER206G A0G has 75 ns. Both remain classified as fast recovery diodes. The HER206G A0G has lower capacitance (20 pF versus 30 pF), which may be advantageous in certain applications. The SF28G-AP is the preferred choice for direct equivalence; the HER206G A0G is an alternative when cross-manufacturer sourcing is necessary.

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

A: Yes. DO-15 and DO-204AC are equivalent axial through-hole packages for rectifier diodes. Both packages support identical PCB footprints and assembly processes. All substitute parts listed are available in these compatible package formats.

Q: Does the extended operating temperature range of the SF28G-AP (-65°C ~ 150°C) affect substitutability?

A: No. The extended temperature range of the SF28G-AP is a performance enhancement that does not affect substitutability. If the original application operates within the SF28-AP temperature range (-55°C ~ 125°C), the SF28G-AP will function identically. The extended range provides additional design margin for applications requiring broader temperature operation.

Q: What is the significance of the forward voltage difference between SF28-AP (1.3 V) and its substitutes (1.7 V)?

A: The forward voltage difference of 0.4 V is typical among rectifier diodes of equivalent rating and does not prevent substitution. In general-purpose rectification applications, this voltage drop variation is accommodated by standard circuit design margins. Applications with strict voltage regulation requirements should verify that the increased forward voltage does not exceed design specifications.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. The SF28G-AP and HER206G A0G are both ROHS3 compliant, matching the compliance status of the SF28-AP. All parts are suitable for applications requiring RoHS compliance.

Q: Can the SF28-AP be sourced despite its obsolete status?

A: The SF28-AP is listed as obsolete. While 871 pieces are currently in stock, long-term availability cannot be guaranteed. Transition to the SF28G-AP or HER206G A0G is recommended for new designs and ongoing production to ensure supply chain continuity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message