SF34-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF34-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs. Alternative parts are available from active product lines with identical or enhanced electrical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF34-AP is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 3 A minimum
Reverse Recovery Time (trr): 35 ns or faster
Package / Case: DO-201AD, Axial (through-hole mounting)
Technology: Standard rectifier diode

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within ±50 mV of 950 mV @ 3 A
Current - Reverse Leakage @ Vr: Equal to or lower than 5 µA @ 200 V
Operating Temperature - Junction: Equal to or wider than -55°C ~ 125°C
Capacitance @ Vr, F: Variation acceptable within application requirements

Substitute parts are classified into two categories: direct equivalents (identical electrical and mechanical specifications with active product status) and upgrade alternatives (enhanced specifications or automotive-grade qualification).

Parameter Comparison

Parameter	SF34-AP (Main)	SF34G-AP (Direct)	SF34GHA0G (Upgrade)	SF64GHA0G (Similar)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	3 A	3 A	3 A	6 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A	975 mV @ 6 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V
Capacitance @ Vr, F	100 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Standard	Standard	Automotive	Automotive
Qualification	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

SF34G-AP (Direct Equivalent - Recommended for Standard Applications)

The SF34G-AP is the direct equivalent replacement for the obsolete SF34-AP. Both parts share identical electrical specifications: 200 V reverse voltage, 3 A average rectified current, 950 mV forward voltage drop at 3 A, and 35 ns reverse recovery time. The SF34G-AP is manufactured by Micro Commercial Co and maintains active product status. The primary differences are enhanced operating temperature range (-65°C to 150°C versus -55°C to 125°C) and lower capacitance (50 pF versus 100 pF at 4V, 1MHz). Both parts are ROHS3 compliant with identical packaging in DO-201AD axial through-hole format. The SF34G-AP is supplied in Tape & Box packaging with 1109 pieces in stock.

SF34GHA0G (Upgrade Option - Automotive Applications)

The SF34GHA0G is an upgrade alternative manufactured by Taiwan Semiconductor Corporation with identical electrical ratings to the SF34-AP (200 V, 3 A, 950 mV forward voltage, 35 ns recovery time). This part carries automotive-grade qualification (AEC-Q101) and is suitable for applications requiring automotive component standards. Operating temperature range extends to -55°C to 150°C. Capacitance is 80 pF at 4V, 1MHz. ROHS3 and REACH compliance are confirmed. This part is recommended when automotive qualification is a design requirement.

SF64GHA0G (Higher Current Alternative)

The SF64GHA0G is a similar part with doubled current rating (6 A versus 3 A) while maintaining 200 V reverse voltage and 35 ns recovery time. Forward voltage increases to 975 mV at 6 A. This part is suitable only when higher current capacity is required and circuit design accommodates the increased forward voltage drop. Automotive-grade qualification (AEC-Q101) is included. Selection of this part requires confirmation that the 6 A rating and 975 mV forward voltage are compatible with the application.

Frequently Asked Questions (FAQ)

Q: Can SF34G-AP be used as a direct replacement for SF34-AP?

A: Yes. The SF34G-AP is a direct equivalent with identical electrical specifications (200 V reverse voltage, 3 A current rating, 950 mV forward voltage, 35 ns recovery time) and identical DO-201AD axial through-hole packaging. The SF34G-AP has active product status, making it the primary replacement for the obsolete SF34-AP.

Q: What is the difference between SF34G-AP and SF34GHA0G?

A: Both parts have identical electrical ratings (200 V, 3 A, 950 mV forward voltage, 35 ns recovery time) and DO-201AD packaging. The SF34GHA0G is manufactured by Taiwan Semiconductor Corporation with automotive-grade qualification (AEC-Q101), while SF34G-AP is a standard-grade part from Micro Commercial Co. The SF34GHA0G is selected when automotive qualification is required.

Q: Can SF64GHA0G replace SF34-AP in all applications?

A: No. The SF64GHA0G has a doubled current rating (6 A versus 3 A) and increased forward voltage (975 mV at 6 A versus 950 mV at 3 A). This part is suitable only when the application requires higher current capacity and the circuit design accommodates the higher forward voltage drop. Direct replacement requires identical current ratings.

Q: Are all substitute parts available in the same DO-201AD package?

A: Yes. All substitute parts (SF34G-AP, SF34GHA0G, and SF64GHA0G) are packaged in DO-201AD axial through-hole format, ensuring mechanical compatibility with the original SF34-AP footprint and mounting method.

Q: What is the operating temperature range difference between SF34-AP and SF34G-AP?

A: The SF34-AP operates from -55°C to 125°C junction temperature. The SF34G-AP extends the upper limit to 150°C and the lower limit to -65°C, providing a wider operating range. Both parts are suitable for standard industrial temperature ranges.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The SF34G-AP, SF34GHA0G, and SF64GHA0G are all ROHS3 compliant, matching the compliance status of the original SF34-AP. REACH compliance is confirmed for the Taiwan Semiconductor Corporation parts (SF34GHA0G and SF64GHA0G).

Q: What is the significance of the AEC-Q101 qualification on SF34GHA0G and SF64GHA0G?

A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this qualification have undergone testing and validation for automotive applications. Selection of AEC-Q101 qualified parts is required when the application is automotive or when automotive-grade component standards are specified in the design requirements.

Q: How does capacitance variation affect substitution?

A: The capacitance values differ among substitute parts (SF34-AP: 100 pF, SF34G-AP: 50 pF, SF34GHA0G: 80 pF, SF64GHA0G: 100 pF at 4V, 1MHz). Capacitance affects high-frequency performance and switching characteristics. Substitution is acceptable when the application does not impose strict capacitance requirements. Applications with frequency-dependent performance specifications require capacitance verification.

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