SF18M-TP Equivalent & Substitute Parts

Part Overview

The SF18M-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (HSMA) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The diode features fast recovery characteristics with a reverse recovery time of 50 ns and operates across a junction temperature range of -65°C to 150°C.

Substiute Parts

SF18M-TP

Micro Commercial CoIn Stock: 961SF18M-TP Datasheet

Current PartRFQ

ES1J-LTP

Micro Commercial CoIn Stock: 55337ES1J-LTP Datasheet

DirectRFQ

STTH2L06A

STMicroelectronicsIn Stock: 45145STTH2L06A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF18M-TP is determined by strict alignment of electrical and mechanical parameters within the rectifier diode category. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
• Mounting Type: Must be Surface Mount
• Package / Case: Must be DO-214AC or SMA compatible
• RoHS Status: Must maintain ROHS3 Compliance
• Moisture Sensitivity Level: Must be MSL 1 or lower

Substitute Classification:

Direct Equivalent (ES1J-LTP): This part maintains identical voltage and current ratings (600 V, 1 A), identical package designation (DO-214AC, SMA), and identical RoHS compliance. The ES1J-LTP is an active product with enhanced specifications including improved reverse recovery time (35 ns versus 50 ns) and extended operating temperature range (-65°C to 175°C versus -65°C to 150°C).

Similar Substitute (STTH2L06A): This part maintains the 600 V voltage rating and DO-214AC/SMA package compatibility but features a higher current rating (2 A versus 1 A). The STTH2L06A is manufactured by STMicroelectronics and is an active product with ROHS3 compliance. This part is suitable for applications where the higher current capacity provides design margin or where the 1 A rating is not a limiting constraint.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-for-Pin, Specification-Matched):

The ES1J-LTP is the primary direct equivalent for the SF18M-TP. Both parts share identical voltage and current ratings (600 V, 1 A), identical package designation (DO-214AC, SMA), and identical RoHS3 compliance status. The ES1J-LTP is an active product with current manufacturing support and improved specifications including faster reverse recovery time (35 ns) and extended operating temperature range to 175°C. The ES1J-LTP is suitable for all applications where the SF18M-TP was originally specified.

For Higher Current Capacity Applications:

The STTH2L06A provides a 600 V rated substitute with doubled current capacity (2 A versus 1 A). This part is manufactured by STMicroelectronics and maintains DO-214AC/SMA package compatibility and ROHS3 compliance. The STTH2L06A is appropriate for designs where increased current margin is beneficial or where the application current requirement does not exceed 2 A. The STTH2L06A features lower reverse leakage current (2 µA versus 5 µA) and extended operating temperature range to 175°C. The reverse recovery time of 85 ns is longer than the SF18M-TP specification; this parameter must be evaluated against application switching frequency requirements.

Compliance and Availability:

Both substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols. ES1J-LTP inventory (55,300 pcs) and STTH2L06A inventory (45,100 pcs) provide adequate supply for production requirements.

Frequently Asked Questions (FAQ)

Q: Can the ES1J-LTP be used as a direct replacement for the SF18M-TP?

A: Yes. The ES1J-LTP is a direct equivalent with identical voltage (600 V), current (1 A), and package specifications (DO-214AC, SMA). Both parts are ROHS3 compliant and MSL 1 rated. The ES1J-LTP is an active product with improved reverse recovery time and extended operating temperature range.

Q: What is the difference between the ES1J-LTP and STTH2L06A?

A: The ES1J-LTP maintains the 1 A current rating of the SF18M-TP, while the STTH2L06A is rated for 2 A. Both parts share the 600 V voltage rating and DO-214AC/SMA package compatibility. The STTH2L06A is manufactured by STMicroelectronics and features lower reverse leakage current (2 µA versus 5 µA). The reverse recovery time differs: ES1J-LTP is 35 ns, STTH2L06A is 85 ns.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. All three parts use the DO-214AC/SMA package designation and are surface mount components. PCB footprints and assembly processes remain unchanged.

Q: Does the higher current rating of the STTH2L06A affect circuit performance?

A: The STTH2L06A can be used in applications designed for 1 A operation without performance degradation. The higher current rating provides design margin. However, the reverse recovery time (85 ns) is longer than the SF18M-TP (50 ns) and ES1J-LTP (35 ns); this must be evaluated for applications with high switching frequencies where reverse recovery characteristics are critical.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both ES1J-LTP and STTH2L06A are ROHS3 compliant with MSL 1 rating, meeting standard environmental and manufacturing requirements.

Q: What is the operating temperature range difference between the SF18M-TP and its substitutes?

A: The SF18M-TP operates from -65°C to 150°C junction temperature. The ES1J-LTP and STTH2L06A both extend the upper limit to 175°C, providing 25°C additional thermal margin for high-temperature applications.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring 1 A operation at 600 V, the ES1J-LTP is the recommended choice as the direct equivalent with active product status and improved specifications. The STTH2L06A is appropriate when higher current capacity or lower reverse leakage current is beneficial to the application.