SS12L RUG Equivalent & Substitute Parts

Part Overview

The SS12L RUG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20 V DC reverse voltage and 1 A average rectified current in a Sub SMA surface mount package (DO-219AB). This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives that meet identical or superior electrical and mechanical specifications. The parts listed below satisfy the core electrical parameters and packaging requirements of the SS12L RUG.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 20 V
Mounting Type	Surface Mount	—
Package / Case	DO-219AB	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SS12L RUG is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Package / Case: DO-219AB (Sub SMA / DO-219AB (SMF))
Mounting Type: Surface Mount
Technology: Schottky
RoHS Status: ROHS3 Compliant

Allowable Parameter Variations:

Current - Average Rectified (Io): Equal to or greater than 1 A
Voltage - Forward (Vf) (Max) @ If: Equal to or less than 450 mV
Current - Reverse Leakage @ Vr: Equal to or less than 400 µA @ 20 V
Operating Temperature - Junction: Must encompass -55°C to 125°C range or higher maximum

The substitute parts SL02-GS08 and SL02-M-18 (both from Vishay General Semiconductor - Diodes Division) meet all mandatory parameters and exceed performance in current capacity (1.1 A vs. 1 A) and reverse leakage characteristics (250 µA vs. 400 µA), making them functionally compatible alternatives.

Parameter Comparison

Parameter	SS12L RUG (Main)	SS12L (Parametric Equivalent)	SL02-GS08	SL02-M-18
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor
Product Status	Active	Not For New Designs	Active	Active
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	1 A	1 A	1.1 A	1.1 A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 1 A	450 mV @ 1 A	420 mV @ 1.1 A	420 mV @ 1.1 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	—	—	10 ns	10 ns
Current - Reverse Leakage @ Vr	400 µA @ 20 V	400 µA @ 20 V	250 µA @ 20 V	250 µA @ 20 V
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB
Operating Temperature - Junction	-55 to 125°C	-55 to 125°C	125°C (Max)	125°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection (Active Status): The SS12L RUG remains the preferred choice for new designs due to its Active product status and current availability (691 pcs in stock). This part carries full RoHS3 compliance and REACH unaffected status, meeting all regulatory requirements for industrial and commercial applications.

Secondary Selection (Active Status, Enhanced Performance): The Vishay SL02-GS08 and SL02-M-18 are both classified as Active products with superior electrical characteristics. Both parts deliver 1.1 A average rectified current (10% higher than the SS12L RUG specification) and reduced reverse leakage current (250 µA vs. 400 µA), resulting in improved efficiency and lower standby power dissipation. Both maintain identical 20 V reverse voltage rating, DO-219AB package compatibility, and RoHS3 compliance. Inventory availability is significantly higher (43,938 pcs and 50,395 pcs respectively), supporting supply chain continuity.

Not Recommended for New Designs: The SS12L (parametric equivalent) carries a "Not For New Designs" status despite meeting all electrical specifications. This designation indicates manufacturer phase-out or obsolescence trajectory and should be avoided in new product development.

Frequently Asked Questions (FAQ)

Q: Can the SL02-GS08 or SL02-M-18 be used as direct replacements for the SS12L RUG?

A: Yes. Both Vishay parts meet all mandatory electrical and mechanical parameters: 20 V reverse voltage rating, 1 A minimum current capacity (both rated 1.1 A), DO-219AB package, surface mount configuration, and Schottky technology. The higher current rating and lower reverse leakage represent performance improvements with no compatibility issues.

Q: What is the difference between SL02-GS08 and SL02-M-18?

A: Both parts are electrically and mechanically identical. They share the same base product number (SL02), voltage rating (20 V), current rating (1.1 A), forward voltage (420 mV @ 1.1 A), reverse leakage (250 µA @ 20 V), and DO-219AB package. The suffix designations (-GS08 vs. -M-18) reflect different manufacturing or distribution codes from Vishay but do not affect functional performance or compatibility.

Q: Why does the SS12L (parametric equivalent) show "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active promotion of this part number for new product development. While the part remains electrically equivalent to the SS12L RUG, design engineers should prioritize the Active-status alternatives (SL02-GS08, SL02-M-18) for long-term supply assurance and manufacturer support.

Q: Are there any thermal or operating temperature differences between these parts?

A: The SS12L RUG specifies a junction temperature range of -55°C to 125°C. The Vishay SL02-GS08 and SL02-M-18 specify a maximum junction temperature of 125°C. Both parts operate within the same upper thermal limit. For applications requiring the full -55°C lower temperature specification, the SS12L RUG or SS12L provide explicit minimum temperature ratings.

Q: Do all substitute parts carry the same compliance certifications?

A: Yes. The SS12L RUG, SS12L, SL02-GS08, and SL02-M-18 all carry RoHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (unlimited). All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080, ensuring equivalent regulatory and export compliance.

Q: What is the significance of the 10 ns reverse recovery time specified for the Vishay parts?

A: The reverse recovery time (trr) of 10 ns is not specified for the SS12L RUG in the provided data. However, both Vishay parts meet the Fast Recovery specification (≤ 500ns, > 200mA) that applies to the main part. The 10 ns value represents a measured parameter for the Vishay devices and indicates faster switching characteristics, which can reduce switching losses in high-frequency applications.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts use the identical DO-219AB package (Sub SMA / SMF), which ensures mechanical and electrical compatibility with existing PCB layouts, solder pad patterns, and assembly processes. No PCB redesign is required.

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