SS14L RQG Equivalent & Substitute Parts

Part Overview

The SS14L RQG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 1 A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status with full RoHS3 and REACH compliance. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and thermal operating ranges. Alternative components become necessary when the primary part number reaches end-of-life status, inventory constraints occur, or design requirements mandate specific manufacturer qualifications such as automotive-grade certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	550	mV @ 1 A
Speed - Fast Recovery	≤ 500	ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400	µA @ 40 V
Package / Case	DO-219AB	Sub SMA
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SS14L RQG is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) Maximum: 40 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-219AB (Sub SMA)
Mounting Type: Surface Mount
Technology: Schottky

Acceptable Variation Parameters:

Voltage - Forward (Vf) Maximum @ If: Substitute parts may operate at equal or lower forward voltage drop
Current - Reverse Leakage @ Vr: Substitute parts may exhibit equal or lower reverse leakage current
Operating Temperature - Junction: Substitute parts may support equal or extended temperature ranges
Capacitance @ Vr, F: Not specified for primary part; not a limiting factor for substitution

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical and package specifications from the same manufacturer) and Similar Manufacturer Parts (equivalent electrical performance from alternative manufacturers with potential enhancements such as automotive qualification or improved thermal characteristics).

Parameter Comparison

Parameter	SS14L RQG (Main)	SS14L (Parametric Equivalent)	SS1FL4HM3/H (Similar Manufacturer)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) Maximum	40 V	40 V	40 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) Maximum @ If	550 mV @ 1 A	550 mV @ 1 A	500 mV @ 1 A
Speed - Fast Recovery	≤ 500 ns, > 200mA (Io)	≤ 500 ns, > 200mA (Io)	≤ 500 ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 40 V	400 µA @ 40 V	200 µA @ 40 V
Package / Case	DO-219AB	DO-219AB	DO-219AB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 125 °C	-55 to 125 °C	-55 to 150 °C
Technology	Schottky	Schottky	Schottky
Product Status	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Qualification	—	—	AEC-Q101

Engineering Selection Recommendations

SS14L (Parametric Equivalent): This part maintains identical electrical specifications and package configuration to the SS14L RQG. However, the product status designation "Not For New Designs" indicates this variant is in mature lifecycle phase. Selection of this substitute is appropriate only for legacy system maintenance, repair operations, or inventory replenishment of existing production lines. New design implementations should not incorporate this part number.

SS1FL4HM3/H (Similar Manufacturer - Vishay): This Schottky rectifier diode from Vishay General Semiconductor meets all mandatory electrical and package requirements with measurable performance improvements: forward voltage drop is reduced to 500 mV (versus 550 mV), reverse leakage current is reduced to 200 µA (versus 400 µA), and maximum junction temperature extends to 150 °C (versus 125 °C). The part carries AEC-Q101 automotive qualification and operates within the eSMP® series. Product status is Active. This substitute is suitable for new designs, automotive applications, and systems requiring enhanced thermal performance or reduced power dissipation. All compliance certifications (RoHS3, REACH) are maintained.

Frequently Asked Questions (FAQ)

Q: Can SS14L RQG be directly replaced with SS14L in existing assemblies?

A: Yes, from an electrical and mechanical standpoint. Both parts share identical voltage ratings (40 V), current ratings (1 A), forward voltage characteristics (550 mV @ 1 A), and package configuration (DO-219AB Sub SMA). However, the SS14L carries "Not For New Designs" status, indicating it is in end-of-life phase. Replacement is functionally valid for maintenance and repair but should not be used in new product development.

Q: What are the key differences between SS14L RQG and SS1FL4HM3/H?

A: Both parts are electrically compatible Schottky rectifier diodes with identical 40 V reverse voltage and 1 A current ratings in DO-219AB packages. The SS1FL4HM3/H from Vishay offers three technical advantages: (1) lower forward voltage drop of 500 mV versus 550 mV, reducing power dissipation; (2) lower reverse leakage current of 200 µA versus 400 µA, improving efficiency; (3) extended maximum junction temperature of 150 °C versus 125 °C, enabling operation in higher-temperature environments. The SS1FL4HM3/H also carries AEC-Q101 automotive qualification, making it suitable for automotive applications.

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

A: Yes. All listed substitute parts utilize the DO-219AB package in Sub SMA form factor with surface mount configuration. Mechanical compatibility with existing PCB layouts and reflow soldering processes is maintained across all substitutes.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed (SS14L and SS1FL4HM3/H) maintain RoHS3 compliance and REACH unaffected status, matching the primary SS14L RQG part. The SS1FL4HM3/H additionally carries AEC-Q101 automotive qualification, enabling use in automotive-grade applications.

Q: Can SS1FL4HM3/H be used in applications originally designed for SS14L RQG?

A: Yes. The SS1FL4HM3/H meets all mandatory electrical specifications (40 V reverse voltage, 1 A current, ≤ 500 ns recovery time) and package requirements (DO-219AB Sub SMA). The improved performance characteristics (lower forward voltage, lower reverse leakage, extended temperature range) make it a direct functional substitute with no design modifications required. Compliance certifications are equivalent or enhanced.

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

A: This designation indicates the part is in mature or declining production phase and may face future discontinuation. While functionally equivalent and suitable for existing product maintenance, this part should not be selected for new product development. The SS1FL4HM3/H with Active status is the recommended choice for new designs.

Q: Are there thermal performance differences between the substitutes?

A: Yes. The SS1FL4HM3/H supports a maximum junction temperature of 150 °C compared to 125 °C for both SS14L RQG and SS14L. Additionally, the SS1FL4HM3/H exhibits lower forward voltage drop (500 mV versus 550 mV) and lower reverse leakage current (200 µA versus 400 µA), resulting in reduced power dissipation and improved thermal efficiency in high-current or high-frequency applications.

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