SF14-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF14-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 200V DC reverse voltage and 1A average rectified current in a DO-41 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application category.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V
Package / Case	DO-204AL, DO-41, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SF14-AP is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-204AL, DO-41, Axial
Mounting Type: Through Hole
Technology: Standard

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within fast recovery diode specifications
Reverse Recovery Time (trr): Faster recovery times are acceptable
Current - Reverse Leakage @ Vr: Lower leakage is acceptable
Operating Temperature - Junction: Extended temperature ranges are acceptable
Product Status: Active status preferred for new designs

The substitute parts identified below meet or exceed the core electrical and mechanical requirements of the SF14-AP while offering improved or equivalent performance characteristics.

Parameter Comparison

Parameter	SF14-AP (Main)	SF14G-AP (Direct)	1N4935GHR1G (Similar)	STTH102 (Similar)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	950 mV @ 1 A	1.2 V @ 1 A	970 mV @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	35 ns	35 ns	200 ns	20 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	1 µA @ 200 V
Capacitance @ Vr, F	40pF @ 4V, 1MHz	20pF @ 4V, 1MHz	10pF @ 4V, 1MHz	Not specified
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SF14G-AP (Direct Equivalent - Recommended Primary Choice)

The SF14G-AP is the direct equivalent manufactured by Micro Commercial Co and shares identical electrical specifications with the SF14-AP. This part is currently in active production status with 874 units in stock. The SF14G-AP provides a seamless replacement with matching voltage ratings, current capacity, and forward voltage characteristics. The extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) provides additional thermal margin. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification. The SF14G-AP is supplied in Tape & Box packaging, suitable for automated assembly processes.

STTH102 (Alternative - Superior Performance)

The STTH102 manufactured by STMicroelectronics meets all core electrical and mechanical requirements with enhanced performance characteristics. This part features a faster reverse recovery time of 20 ns compared to the SF14-AP's 35 ns, resulting in reduced switching losses. The reverse leakage current is lower at 1 µA versus 5 µA, indicating superior blocking characteristics. The maximum operating temperature extends to 175°C, providing the highest thermal capability among available options. The STTH102 is supplied in Cut Tape packaging with 1600 units in stock. ROHS3 compliance and unlimited MSL rating are maintained.

1N4935GHR1G (Alternative - Automotive Grade)

The 1N4935GHR1G manufactured by Taiwan Semiconductor Corporation meets core electrical specifications and includes automotive qualification per AEC-Q101. This part is suitable for applications requiring automotive-grade components. The forward voltage is higher at 1.2 V compared to 950 mV, which may impact efficiency in low-voltage applications. The reverse recovery time of 200 ns is significantly longer than the SF14-AP, making this option less suitable for high-frequency switching applications. This part is available with 1088 units in stock and maintains ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SF14G-AP be used as a direct replacement for SF14-AP?

A: Yes. The SF14G-AP is the direct equivalent with identical electrical specifications including voltage rating (200V), current capacity (1A), forward voltage (950 mV @ 1A), and reverse recovery time (35 ns). Both parts use the same DO-41 through-hole package. The primary difference is product status: SF14-AP is obsolete while SF14G-AP is active production.

Q: What are the key differences between STTH102 and SF14-AP?

A: The STTH102 maintains identical voltage and current ratings but offers improved performance: reverse recovery time is 20 ns versus 35 ns, reverse leakage current is 1 µA versus 5 µA, and maximum junction temperature is 175°C versus 125°C. Forward voltage is slightly higher at 970 mV versus 950 mV. All parts share the same DO-41 package and through-hole mounting.

Q: Is the 1N4935GHR1G suitable for high-frequency switching applications?

A: The 1N4935GHR1G has a reverse recovery time of 200 ns, which is significantly longer than the SF14-AP (35 ns) and STTH102 (20 ns). This characteristic makes it less suitable for applications requiring fast switching. The 1N4935GHR1G is optimized for automotive applications where switching speed is less critical.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (SF14G-AP, STTH102, and 1N4935GHR1G) maintain ROHS3 compliance status, matching the SF14-AP's environmental certification.

Q: What is the difference in packaging between these parts?

A: All parts use the same DO-204AL/DO-41 axial through-hole package. Packaging format differs: SF14-AP and SF14G-AP are supplied in standard formats, STTH102 is supplied in Cut Tape (CT), and 1N4935GHR1G is supplied in standard format. These differences affect procurement and assembly processes but do not impact electrical or mechanical compatibility.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, all substitute parts use identical DO-41 through-hole package dimensions and axial lead configuration. No PCB layout modifications are required. Electrical performance is equivalent or superior across all critical parameters.

Q: Which substitute part offers the best thermal performance?

A: The STTH102 offers the highest maximum junction temperature rating at 175°C, compared to 150°C for SF14G-AP and 1N4935GHR1G, and 125°C for the original SF14-AP. This provides the greatest thermal margin for applications operating at elevated temperatures.

Q: What is the reverse leakage current specification across all parts?

A: SF14-AP and SF14G-AP specify 5 µA @ 200V. The 1N4935GHR1G also specifies 5 µA @ 200V. The STTH102 offers superior performance with 1 µA @ 200V, indicating lower leakage and better blocking characteristics.

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