B170-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B170-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 70 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMA package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts operate within compatible parameter ranges for the same functional application.

Substiute Parts

B170-13

Diodes IncorporatedIn Stock: 981B170-13 Datasheet

Current PartRFQ

B170-13-F

Diodes IncorporatedIn Stock: 4080B170-13-F Datasheet

Parametric EquivalentRFQ

SS18

onsemiIn Stock: 5254SS18 Datasheet

MFR RecommendedRFQ

SS18-LTP

Micro Commercial CoIn Stock: 65164SS18-LTP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B170-13 is determined by the following critical parameters: Schottky technology classification, 1 A average rectified current rating, Surface Mount SMA package configuration, and fast recovery speed characteristic. Parts are grouped into two categories based on voltage rating compatibility.

Category 1: Parametric Equivalent (70 V Rating) Parts maintaining the exact 70 V DC reverse voltage specification with identical forward voltage and current characteristics. These parts are direct functional replacements with no circuit re-evaluation required.

Category 2: Voltage-Rated Substitutes (80 V Rating) Parts rated for 80 V DC reverse voltage with 1 A current capacity. These parts operate within a higher voltage margin and are compatible with circuits designed for 70 V operation. Substitution is valid because the 80 V rating encompasses the 70 V requirement, and all other critical parameters (current, package, mounting type, speed) remain compatible.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: B170-13-F

The B170-13-F is the preferred substitute for the discontinued B170-13. This part is manufactured by Diodes Incorporated, the original equipment manufacturer, and maintains identical electrical specifications including 70 V reverse voltage, 1 A current rating, 790 mV forward voltage, and -65°C to 150°C operating temperature range. The B170-13-F is classified as Active product status, ensuring long-term availability. The part is ROHS3 compliant, addressing environmental regulatory requirements where the original B170-13 is non-compliant. Packaging is supplied in Tape & Reel format, suitable for automated assembly processes.

Secondary Recommendation: SS18-LTP

The SS18-LTP manufactured by Micro Commercial Co operates at 80 V reverse voltage with 1 A current capacity, providing a higher voltage margin for circuits designed around the 70 V B170-13 specification. This part demonstrates superior reverse leakage characteristics at 50 µA compared to the B170-13 at 500 µA, and lower capacitance at 35pF. The SS18-LTP is ROHS3 compliant and maintains the -55°C to 150°C operating temperature range, which encompasses the original -65°C lower limit. Product status is classified as Not For New Designs; however, this part remains available with substantial inventory. Packaging is supplied in Tape & Reel format.

Alternative Consideration: SS18

The SS18 manufactured by onsemi is rated for 80 V reverse voltage and 1 A current. This part is classified as Not For New Designs and exhibits a higher forward voltage of 850 mV compared to the B170-13 at 790 mV. Operating temperature range is limited to -65°C to 125°C, which does not extend to the original 150°C upper limit. This part is suitable only where voltage margin and reduced leakage current are prioritized over temperature range and forward voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can the B170-13-F directly replace the B170-13 without circuit modification?

A: Yes. The B170-13-F maintains identical electrical specifications: 70 V reverse voltage, 1 A current rating, 790 mV forward voltage at 1 A, and -65°C to 150°C operating temperature. Both parts use the DO-214AC SMA package with Surface Mount configuration. No circuit re-evaluation is required.

Q: What is the difference between the B170-13 and SS18-LTP in terms of circuit performance?

A: The SS18-LTP is rated for 80 V reverse voltage compared to the B170-13 at 70 V, providing additional voltage margin. The SS18-LTP exhibits lower reverse leakage current at 50 µA versus 500 µA, and lower capacitance at 35pF versus 80pF. Forward voltage is higher at 850 mV compared to 790 mV. These differences result in reduced power dissipation from leakage but slightly increased forward voltage drop.

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

A: No. The B170-13 is supplied in bulk packaging, while B170-13-F and SS18-LTP are supplied in Tape & Reel format. The SS18 is supplied in Cut Tape and Digi-Reel format. Tape & Reel packaging is standard for automated assembly; bulk packaging requires manual handling.

Q: What is the significance of the RoHS compliance difference?

A: The B170-13 is RoHS non-compliant, while B170-13-F, SS18, and SS18-LTP are ROHS3 compliant. ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. For applications subject to environmental regulations or customer requirements, ROHS3 compliant parts are mandatory.

Q: Can the SS18 or SS18-LTP be used in applications requiring the full -65°C to 150°C temperature range?

A: The SS18 is limited to -65°C to 125°C, which does not meet the 150°C upper limit of the B170-13. The SS18-LTP operates from -55°C to 150°C, which does not meet the -65°C lower limit of the B170-13. Selection depends on the specific temperature requirements of the application.

Q: Why is the B170-13-F preferred over the SS18-LTP despite both being available?

A: The B170-13-F is the original equipment manufacturer equivalent with identical electrical specifications and full temperature range compatibility (-65°C to 150°C). The SS18-LTP requires acceptance of a higher voltage rating (80 V versus 70 V) and a reduced lower operating temperature limit (-55°C versus -65°C). For direct replacement without design modification, B170-13-F is the appropriate selection.

Q: What does "Not For New Designs" product status mean for the SS18 and SS18-LTP?

A: "Not For New Designs" indicates the manufacturer is not recommending these parts for new circuit designs and may discontinue production. These parts remain available for existing applications and repair; however, for new development, parts with Active status such as B170-13-F are preferred to ensure long-term supply continuity.