SF12M-TP Equivalent & Substitute Parts

Part Overview

The SF12M-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 1 A average rectified current in a DO-214AC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The fast recovery characteristic (≤500 ns) and 35 ns reverse recovery time position this diode for applications requiring rapid switching performance in standard rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Speed Classification	Fast Recovery ≤500ns, >200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF12M-TP is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤500ns, >200mA (Io)
RoHS Status: ROHS3 Compliant

Current Rating Consideration: The SF12M-TP is rated for 1 A average rectified current. Substitute parts must meet or exceed this current specification to ensure adequate performance in the original application circuit.

Reverse Recovery Time: The SF12M-TP specifies 35 ns reverse recovery time. Substitute parts with equal or faster recovery times maintain switching performance characteristics.

Temperature Range: The SF12M-TP operates from -65°C to 150°C junction temperature. Substitute parts with equal or extended temperature ranges are acceptable.

The three substitute parts listed below satisfy the mandatory matching criteria with variations in current rating, reverse recovery time, and temperature range as detailed in the parameter comparison table.

Parameter Comparison

Parameter	SF12M-TP	ES1B-LTP	US1B-E3/5AT	VS-2EMH01-M3/5AT
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	1 A	2 A
Voltage - Forward (Vf) (Max) @ If	—	950 mV @ 1 A	1 V @ 1 A	950 mV @ 2 A
Speed Classification	Fast Recovery ≤500ns, >200mA (Io)	Fast Recovery ≤500ns, >200mA (Io)	Fast Recovery ≤500ns, >200mA (Io)	Fast Recovery ≤500ns, >200mA (Io)
Reverse Recovery Time (trr)	35 ns	35 ns	50 ns	25 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	10 µA @ 100 V	2 µA @ 100 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	—
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-65 to 150°C	-65 to 175°C	-55 to 150°C	-55 to 175°C
Product Status	Obsolete	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ES1B-LTP (Micro Commercial Co): This part is a direct equivalent from the same manufacturer with identical electrical specifications to the SF12M-TP. The ES1B-LTP maintains 1 A current rating, 35 ns reverse recovery time, and 5 µA reverse leakage. The extended temperature range (-65 to 175°C) provides additional thermal margin. However, the product status is classified as "Not For New Designs," indicating limited long-term availability. This part is suitable for replacement in existing applications where the SF12M-TP is no longer obtainable.

US1B-E3/5AT (Vishay General Semiconductor - Diodes Division): This part is manufactured by Vishay and maintains the 1 A current rating and 100 V voltage specification. The US1B-E3/5AT has an active product status, ensuring ongoing availability. The reverse recovery time is 50 ns, which is 15 ns slower than the SF12M-TP but remains within fast recovery classification. The reverse leakage current is 10 µA, double that of the SF12M-TP. The operating temperature range is -55 to 150°C, which is narrower at the lower end compared to the SF12M-TP. This part is suitable for applications where the slightly increased reverse recovery time and leakage current are acceptable.

VS-2EMH01-M3/5AT (Vishay General Semiconductor - Diodes Division): This part is rated for 2 A average rectified current, providing 100% current margin over the SF12M-TP specification. The reverse recovery time is 25 ns, faster than the SF12M-TP. The reverse leakage current is 2 µA, lower than the SF12M-TP. The operating temperature range extends to 175°C. The product status is active with established supply. This part is suitable for applications where increased current capacity is beneficial or where improved switching performance is required. The higher current rating does not preclude use in 1 A circuits.

Frequently Asked Questions (FAQ)

Q: Can the ES1B-LTP directly replace the SF12M-TP in all applications?

A: The ES1B-LTP is electrically equivalent to the SF12M-TP with identical voltage, current, and reverse recovery specifications. Both parts use the DO-214AC package. Direct substitution is supported from an electrical and mechanical standpoint. The product status difference ("Not For New Designs" versus "Obsolete") reflects supply chain considerations rather than functional incompatibility.

Q: What is the difference between the US1B-E3/5AT and SF12M-TP in terms of switching performance?

A: The US1B-E3/5AT has a reverse recovery time of 50 ns compared to the SF12M-TP at 35 ns. Both parts are classified as fast recovery diodes. The 15 ns difference represents approximately 43% longer recovery time. In applications sensitive to switching speed, this difference may be significant. The US1B-E3/5AT is suitable where this performance trade-off is acceptable in exchange for active product status and established supply.

Q: Why is the VS-2EMH01-M3/5AT rated for 2 A when the original circuit uses 1 A?

A: The VS-2EMH01-M3/5AT is rated for 2 A average rectified current, which exceeds the SF12M-TP specification of 1 A. A higher current rating does not prevent use in lower current applications. The diode will operate within its safe operating area at 1 A. The advantage is improved thermal margin and longer component life. The faster reverse recovery time (25 ns) and lower reverse leakage (2 µA) provide additional performance benefits.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use the DO-214AC (SMA) surface mount package, identical to the SF12M-TP. The ES1B-LTP is supplied in Tape & Reel (TR) packaging, as are the US1B-E3/5AT and VS-2EMH01-M3/5AT. Packaging format compatibility ensures mechanical interchangeability in automated assembly processes.

Q: What is the significance of the "Not For New Designs" status of the ES1B-LTP?

A: The "Not For New Designs" classification indicates that the manufacturer is not recommending this part for new circuit designs. This typically reflects a transition strategy toward newer alternatives or planned discontinuation. For existing production lines or maintenance applications, the ES1B-LTP remains functionally viable. For new designs, the US1B-E3/5AT or VS-2EMH01-M3/5AT with "Active" status are preferred for long-term supply assurance.

Q: How do the temperature ranges of these parts affect circuit design?

A: The SF12M-TP operates from -65 to 150°C. The ES1B-LTP and VS-2EMH01-M3/5AT extend to 175°C, providing 25°C additional margin at the upper limit. The US1B-E3/5AT is limited to -55 to 150°C, reducing the lower temperature range by 10°C. For applications operating near temperature extremes, the extended range parts offer design flexibility. For standard industrial applications (-40 to 85°C ambient), all parts are suitable.

Q: What does the reverse leakage current specification mean for circuit performance?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. The SF12M-TP specifies 5 µA at 100 V. The US1B-E3/5AT has 10 µA, and the VS-2EMH01-M3/5AT has 2 µA. In high-impedance circuits or precision applications, lower leakage is preferable. In standard rectification circuits, the difference between 2 and 10 µA is typically negligible. The VS-2EMH01-M3/5AT offers superior leakage performance if this parameter is critical to the application.

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