STPS140AFN Equivalent & Substitute Parts Reference

Part Overview

The STPS140AFN is a Schottky rectifier diode in the Diodes, Rectifiers category, manufactured by STMicroelectronics. It is specified for 40 V reverse voltage and 1 A average rectified current, featuring fast recovery characteristics. The device utilizes a surface mount DO-221AC, SMA Flat Leads package. The part is classified as obsolete. As such, identifying alternative models with matched electrical and mechanical parameters is essential to ensure continued design support and manufacturing availability.

Substiute Parts

STPS140AFN

STMicroelectronicsIn Stock: 728STPS140AFN Datasheet

Current PartRFQ

STPS140A

STMicroelectronicsIn Stock: 105474STPS140A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution is validated only where the following key parameters are strictly matched:

• Schottky technology
• Maximum reverse voltage (Vr): 40 V
• Average rectified current (Io): 1A
• Maximum forward voltage (Vf) at 1 A: 550 mV
• Fast recovery speed (≤ 500 ns, >200 mA)
• Maximum reverse leakage at test voltage: 12 µA @ 40 V
• Mounting type: Surface mount
• Operating junction temperature: 150°C
• Compliant environmental and regulatory certifications (RoHS3, REACH)
• Comparable package outline (surface mount, SMA-type)

Only parts demonstrating full parity with all these explicit parameters are included as substitutes.

Parameter Comparison

Engineering Selection Recommendations

The STPS140AFN is classified as obsolete. The substitute part STPS140A matches all key electrical and regulatory parameters, with maintained RoHS3 and REACH compliance and unlimited moisture sensitivity level. The main distinction is the transition between DO-221AC (SMA Flat Leads) and DO-214AC (SMA) packages; both are surface-mount SMA-type outlines. Both parts permit use in designs requiring the stated electrical and environmental conditions. No additional technical criteria are permitted for selection.

Frequently Asked Questions (FAQ)

Q: What parameters are strictly required for substituting STPS140AFN?
A: Substitution requires equality in technology (Schottky), reverse voltage (40 V), average rectified current (1A), forward voltage at 1 A (550 mV), fast recovery speed (≤ 500ns), reverse leakage current (12 µA @ 40 V), surface mount configuration, operating junction temperature (150°C), and regulatory compliance (RoHS3, REACH).

Q: Is package difference significant between STPS140AFN and STPS140A?
A: Both parts use surface-mount SMA-form-factor outlines. The STPS140AFN uses DO-221AC (SMA Flat Leads) and the STPS140A uses DO-214AC (SMA). Both are surface-mount packages suitable where SMA-type footprints are used.

Q: Are environmental compliance and MSL specifications maintained in the substitute?
A: Both the original and substitute parts are ROHS3 compliant, REACH unaffected, and rated MSL 1 (Unlimited), permitting use in compliant designs with no additional moisture sensitivity restrictions.

Q: Does the substitute part STPS140A offer the same electrical performance?
A: The STPS140A matches the STPS140AFN in all specified electrical parameters provided in the input.

Q: Why is it necessary to identify a substitute for STPS140AFN?
A: The STPS140AFN is listed with obsolete part status, necessitating use of a substitute to ensure continued manufacturing and supply chain continuity.