SF12-TP Equivalent & Substitute Parts

Part Overview

The SF12-TP is a general-purpose rectifier diode rated for 100V DC reverse voltage and 1A average rectified current in a DO-41 through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The part operates across a junction temperature range of -55°C to 125°C and features fast recovery characteristics with a reverse recovery time of 35 nanoseconds.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF12-TP is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100V minimum
Current - Average Rectified (Io): 1A minimum
Technology classification: Standard
Speed category: Fast Recovery

Mechanical Equivalence Criteria:

Package / Case: DO-204AL or DO-41 (axial through-hole)
Mounting Type: Through Hole

Compliance Criteria:

RoHS3 Compliant status
ECCN and HTSUS classifications match

The 1N4934-E3/73 manufactured by Vishay General Semiconductor - Diodes Division satisfies all substitution criteria. Both parts share identical reverse voltage and average rectified current ratings, operate within compatible temperature ranges, and utilize the same through-hole axial package configuration. The substitute part maintains active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	SF12-TP (Micro Commercial Co)	1N4934-E3/73 (Vishay)	Compatibility
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1.2 V @ 1 A	Compatible
Reverse Recovery Time (trr)	35 ns	200 ns	Compatible
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	Equivalent
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz	Compatible
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature - Junction	-55 to 125°C	-50 to 150°C	Compatible
Technology	Standard	Standard	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Upgrade Path

Engineering Selection Recommendations

The 1N4934-E3/73 is the direct equivalent substitute for the SF12-TP. Both components meet identical electrical specifications for reverse voltage and average rectified current. The substitute part carries active product status from Vishay General Semiconductor - Diodes Division, providing assured long-term availability compared to the obsolete SF12-TP.

Both parts maintain ROHS3 compliance and share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications, ensuring regulatory and trade compliance equivalence. The 1N4934-E3/73 operates across an extended junction temperature range (-50 to 150°C) compared to the SF12-TP (-55 to 125°C), providing additional thermal margin in applications requiring elevated operating temperatures.

Forward voltage characteristics differ slightly, with the 1N4934-E3/73 specified at 1.2V versus 950mV for the SF12-TP at 1A. This represents a 250mV increase in forward voltage drop. Reverse recovery time extends from 35ns to 200ns in the substitute part. These parameter variations remain within acceptable tolerances for standard general-purpose rectifier applications and do not preclude direct substitution in circuit designs originally specified for the SF12-TP.

Frequently Asked Questions (FAQ)

Q: Can the 1N4934-E3/73 be used as a direct replacement for the SF12-TP in existing circuit designs?

A: Yes. Both diodes share identical reverse voltage (100V) and average rectified current (1A) ratings, operate in the same DO-41 through-hole package, and maintain equivalent RoHS3 compliance. The electrical characteristics are compatible for general-purpose rectification applications.

Q: What are the differences in forward voltage between these parts?

A: The SF12-TP specifies 950mV maximum forward voltage at 1A, while the 1N4934-E3/73 specifies 1.2V maximum at 1A. This 250mV difference may affect power dissipation calculations in high-current applications but does not prevent functional substitution in standard rectifier circuits.

Q: How do the reverse recovery times compare?

A: The SF12-TP exhibits 35ns reverse recovery time, while the 1N4934-E3/73 specifies 200ns. The longer recovery time in the substitute part may introduce slightly increased switching losses in high-frequency applications but remains acceptable for standard rectification duty.

Q: Are the packages physically identical?

A: Yes. Both parts use the DO-204AL (DO-41) axial through-hole package. Physical dimensions, lead spacing, and mounting characteristics are equivalent, allowing direct board-level substitution without layout modifications.

Q: What is the temperature operating range difference?

A: The SF12-TP operates from -55°C to 125°C junction temperature, while the 1N4934-E3/73 operates from -50°C to 150°C. The substitute part provides extended high-temperature capability, suitable for applications requiring operation above 125°C.

Q: Why is the SF12-TP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 1N4934-E3/73 maintains active product status, ensuring continued availability, technical support, and supply chain reliability for new designs and ongoing production requirements.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant and share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Regulatory and trade compliance requirements are equivalent.

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