SS18-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS18-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 80 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and design requirements. Substitute parts must maintain electrical performance within the specified parameter ranges while meeting current availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	850	mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 80 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS18-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 80 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Technology: Schottky rectifier diode
Package / Case: DO-214AC (SMA) surface mount
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Operating range 790–850 mV @ 1 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: Minimum -55°C, maximum 125°C or higher
Current - Reverse Leakage @ Vr: Acceptable range up to 500 µA @ rated voltage

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same base product number, different packaging or revision) and Similar Manufacturer Alternatives (equivalent electrical specifications from different manufacturers).

Parameter Comparison

Parameter	SS18-TP (Main)	SS18-LTP	B180-13-F	B170-13-F	SS18 (onsemi)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	onsemi
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	70 V	80 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A	850 mV @ 1 A	790 mV @ 1 A	790 mV @ 1 A	850 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 80 V	50 µA @ 80 V	500 µA @ 80 V	500 µA @ 70 V	200 µA @ 80 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55 to 125°C	-55 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 125°C
Product Status	Obsolete	Not For New Designs	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Manufacturer Substitutes (Micro Commercial Co):

SS18-LTP is a direct substitute from the same manufacturer with identical electrical ratings (80 V, 1 A, 850 mV forward voltage). This part offers improved reverse leakage characteristics (50 µA versus 500 µA) and extended operating temperature range (-55 to 150°C). However, SS18-LTP is classified as Not For New Designs. For new production designs, this part is acceptable only where existing inventory or supply chain constraints require its use.

Active Manufacturer Alternatives:

B180-13-F (Diodes Incorporated) is the preferred substitute for new designs. It meets all electrical requirements with 80 V reverse voltage and 1 A current rating. The forward voltage is lower (790 mV versus 850 mV), resulting in reduced power dissipation. Operating temperature range extends to 150°C. This part is classified as Active and carries full manufacturer support. Higher capacitance (80 pF) may affect high-frequency switching applications.

B170-13-F (Diodes Incorporated) is a lower voltage alternative rated for 70 V reverse voltage. This part is suitable only for applications where the maximum reverse voltage requirement is 70 V or less. Forward voltage is 790 mV with extended temperature range to 150°C. This part is Active status.

SS18 (onsemi) provides equivalent electrical performance to the main part with 80 V, 1 A ratings and 850 mV forward voltage. Reverse leakage is 200 µA, intermediate between SS18-TP and SS18-LTP. This part is Not For New Designs and should be used only where supply continuity is critical.

Compliance and Availability:

All substitute parts are ROHS3 Compliant and REACH Unaffected. B180-13-F and B170-13-F (Active status) are recommended for new production. SS18-LTP and SS18 (onsemi) are available for legacy support but carry Not For New Designs status.

Frequently Asked Questions (FAQ)

Q: Can B170-13-F replace SS18-TP in all applications?

A: B170-13-F is suitable only for applications where the maximum reverse voltage requirement does not exceed 70 V. The SS18-TP is rated for 80 V reverse voltage. If the circuit design requires 80 V reverse voltage capability, B170-13-F is not a direct substitute. B180-13-F is the appropriate alternative for full voltage compatibility.

Q: What is the difference between SS18-TP and SS18-LTP?

A: Both parts are manufactured by Micro Commercial Co with identical electrical ratings (80 V, 1 A, 850 mV forward voltage) and package type (DO-214AC, SMA). SS18-LTP offers lower reverse leakage current (50 µA versus 500 µA) and extended operating temperature range (-55 to 150°C versus -55 to 125°C). SS18-TP is Obsolete; SS18-LTP is Not For New Designs.

Q: Why does B180-13-F have higher capacitance than SS18-TP?

A: B180-13-F exhibits 80 pF capacitance at 4 V, 1 MHz, compared to 30 pF for SS18-TP. This difference is inherent to the Diodes Incorporated design. Higher capacitance may affect switching speed in high-frequency applications. Verify capacitance specifications against circuit requirements before selection.

Q: Is the onsemi SS18 equivalent to the Micro Commercial Co SS18-TP?

A: The onsemi SS18 shares the same base product number but is manufactured by a different company. Electrical specifications are equivalent (80 V, 1 A, 850 mV forward voltage, fast recovery). Reverse leakage is 200 µA, intermediate between SS18-TP (500 µA) and SS18-LTP (50 µA). The onsemi part is Not For New Designs.

Q: Which substitute part is recommended for new production designs?

A: B180-13-F (Diodes Incorporated) is the recommended substitute for new production. It is classified as Active, meets all electrical requirements of the SS18-TP (80 V, 1 A), and offers lower forward voltage (790 mV) for reduced power dissipation. Extended operating temperature range (-65 to 150°C) provides additional design margin.

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

A: All substitute parts use DO-214AC (SMA) surface mount packaging, identical to SS18-TP. Mounting type is Surface Mount for all alternatives. No package conversion or PCB redesign is required for substitution.

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

A: Parts marked "Not For New Designs" are in mature or declining production phases. Manufacturers may discontinue these parts with limited notice. For new product development, select parts with Active status (B180-13-F or B170-13-F) to ensure long-term supply availability and manufacturer support.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage differences between 790 mV (B180-13-F, B170-13-F) and 850 mV (SS18-TP, SS18-LTP, onsemi SS18) result in lower power dissipation with the lower voltage parts. In precision rectification or voltage-sensitive applications, verify that the lower forward voltage does not affect circuit operation. In most power supply and protection applications, this difference is negligible.

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