SS14LHMQG Equivalent & Substitute Parts

Part Overview

The SS14LHMQG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 1A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status and carries AEC-Q101 automotive qualification with ROHS3 compliance.

Equivalent and substitute parts are identified when alternative components satisfy the same electrical and mechanical specifications, enabling design flexibility, inventory optimization, and supply chain continuity. The SS14LHMQG serves as the reference baseline for this substitution analysis.

Substiute Parts

SS14LHMQG

Taiwan Semiconductor CorporationIn Stock: 1182SS14LHMQG Datasheet

Current PartRFQ

SS14L

Taiwan Semiconductor CorporationIn Stock: 23363SS14L Datasheet

Parametric EquivalentRFQ

SS1FL4HM3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 33227SS1FL4HM3/H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SS14LHMQG is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 40V
• Current - Average Rectified (Io): 1A
• Technology: Schottky
• Package / Case: DO-219AB
• Mounting Type: Surface Mount
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Within component design tolerance
• Current - Reverse Leakage @ Vr: Within component design tolerance
• Operating Temperature - Junction: Equal or extended range acceptable
• Capacitance @ Vr, F: Not specified for main part; not a limiting factor

Parts are grouped as Parametric Equivalent when all mandatory parameters match exactly. Parts are grouped as Similar when they meet all mandatory electrical and mechanical requirements but originate from different manufacturers or exhibit minor performance variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

SS14L (Parametric Equivalent - Taiwan Semiconductor Corporation)

The SS14L is a parametric equivalent to the SS14LHMQG with identical electrical specifications and package configuration. Both components are manufactured by Taiwan Semiconductor Corporation and share the same base product number SS14. The SS14L carries ROHS3 compliance and MSL 1 rating. However, the SS14L is designated as "Not For New Designs," indicating this part is in mature or declining production status. Selection of SS14L is appropriate for legacy system maintenance, repair operations, or inventory replenishment of existing designs where supply continuity is prioritized over new product qualification.

SS1FL4HM3/H (Similar - Vishay General Semiconductor - Diodes Division)

The SS1FL4HM3/H is a similar substitute manufactured by Vishay General Semiconductor - Diodes Division, part of the eSMP® series. This component meets all mandatory electrical and mechanical parameters: 40V reverse voltage, 1A average rectified current, Schottky technology, DO-219AB package, and fast recovery speed classification. The SS1FL4HM3/H exhibits superior performance characteristics: forward voltage of 500 mV @ 1A (50 mV lower than the main part) and reverse leakage current of 200 µA @ 40V (200 µA lower than the main part). The operating temperature range extends to 150°C, providing thermal margin beyond the SS14LHMQG specification. Both components carry AEC-Q101 automotive qualification, ROHS3 compliance, and MSL 1 rating. The SS1FL4HM3/H is designated as Active product status. Selection of SS1FL4HM3/H is appropriate for new designs, high-reliability applications, and situations where improved electrical performance and extended temperature operation are beneficial.

Frequently Asked Questions (FAQ)

Q: Can SS14L be used as a direct replacement for SS14LHMQG in production?

A: The SS14L is electrically and mechanically equivalent to the SS14LHMQG. Both components share identical voltage ratings (40V), current ratings (1A), forward voltage characteristics (550 mV @ 1A), and package configuration (DO-219AB Sub SMA). Direct substitution is permissible from a functional standpoint. However, the SS14L carries "Not For New Designs" status, indicating reduced manufacturing priority. Substitution decisions should account for supply availability, production volume requirements, and design lifecycle stage.

Q: What are the key differences between SS1FL4HM3/H and SS14LHMQG?

A: Both components satisfy the same voltage (40V), current (1A), and package (DO-219AB) requirements. The SS1FL4HM3/H differs in three measurable aspects: (1) Forward voltage is 50 mV lower (500 mV vs. 550 mV @ 1A), resulting in reduced power dissipation; (2) Reverse leakage current is 200 µA lower (200 µA vs. 400 µA @ 40V), indicating superior blocking characteristics; (3) Operating temperature range extends to 150°C versus 125°C for the SS14LHMQG. The SS1FL4HM3/H is manufactured by Vishay and carries Active product status.

Q: Are all three parts suitable for automotive applications?

A: The SS14LHMQG and SS1FL4HM3/H both carry AEC-Q101 automotive qualification and Automotive grade designation. The SS14L does not specify automotive grade or AEC-Q101 qualification in the provided data. For automotive applications requiring formal qualification documentation, SS14LHMQG and SS1FL4HM3/H are the appropriate selections.

Q: What is the significance of "Not For New Designs" status for SS14L?

A: "Not For New Designs" indicates the part is in mature production phase with reduced manufacturing investment and potential supply constraints. This designation does not affect electrical or mechanical functionality. Parts with this status are suitable for sustaining production of existing designs, field repairs, and legacy system support. For new product development, Active status parts such as SS14LHMQG or SS1FL4HM3/H are preferred to ensure long-term supply availability and manufacturing support.

Q: Can package differences affect PCB layout or assembly processes?

A: All three parts use the DO-219AB package in Sub SMA or SMF configuration, which are equivalent surface mount packages. PCB footprints, solder reflow profiles, and pick-and-place equipment compatibility remain consistent across all three parts. No layout or assembly process modifications are required when substituting between these components.

Q: How do reverse leakage current differences impact circuit performance?

A: The SS1FL4HM3/H exhibits 200 µA reverse leakage at 40V, compared to 400 µA for the SS14LHMQG. Lower reverse leakage reduces standby current consumption and improves blocking efficiency in rectification circuits. For applications sensitive to leakage current—such as precision analog circuits, low-power standby modes, or high-impedance signal paths—the SS1FL4HM3/H provides superior performance. For standard rectification applications, both leakage specifications are acceptable.

Q: Is thermal performance a consideration when selecting between these parts?

A: The SS1FL4HM3/H supports junction temperatures to 150°C, while the SS14LHMQG is rated to 125°C. The lower forward voltage of SS1FL4HM3/H (500 mV vs. 550 mV @ 1A) generates less heat during conduction. For applications operating near maximum ambient temperature or with limited thermal management, the SS1FL4HM3/H provides thermal margin. For standard operating conditions within the -55°C to 125°C range, both parts perform equivalently.