SS14L RUG Equivalent & Substitute Parts

Part Overview

The SS14L RUG 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 (DO-219AB). This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives with enhanced performance characteristics or automotive-grade qualifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	550	mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400	µA @ 40 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 of the SS14L RUG is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 1 A or greater
Package / Case: DO-219AB (Sub SMA)
Mounting Type: Surface Mount
Technology: Schottky
RoHS Status: ROHS3 Compliant

Substitution Categories:

Parametric Equivalent: SS14L (Cut Tape & Digi-Reel® packaging variant) maintains identical electrical specifications and package type with different packaging format and product status designation.

Similar Manufacturer Parts: SL04-HM3-08 and SS1FL4HM3/H are functionally compatible alternatives that meet or exceed the primary electrical requirements while offering enhanced performance characteristics such as lower forward voltage, reduced reverse leakage current, automotive-grade qualification (AEC-Q101), and extended operating temperature ranges.

Parameter Comparison

Parameter	SS14L RUG (Main)	SS14L (Equivalent)	SL04-HM3-08 (Similar)	SS1FL4HM3/H (Similar)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	1 A	1 A	1.1 A	1 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	550 mV @ 1 A	540 mV @ 1.1 A	500 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 40 V	400 µA @ 40 V	20 µA @ 40 V	200 µA @ 40 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB
Operating Temperature - Junction	-55 to 125°C	-55 to 125°C	175°C (Max)	-55 to 150°C
Product Status	Active	Not For New Designs	Active	Active
Automotive Grade / Qualification	—	—	AEC-Q101	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

SS14L (Parametric Equivalent): This part maintains identical electrical and thermal specifications to the SS14L RUG with alternative packaging format (Cut Tape & Digi-Reel®). However, this part is designated "Not For New Designs," limiting its application to legacy system support or replacement scenarios only. Selection is appropriate only when packaging format compatibility is required and product lifecycle status is acceptable for the application.

SL04-HM3-08 (Similar Manufacturer Part): This Vishay part exceeds the primary electrical requirements with 1.1 A rated current capacity and demonstrates superior performance characteristics including 20 µA reverse leakage current (versus 400 µA) and automotive-grade AEC-Q101 qualification. The maximum junction temperature of 175°C provides extended thermal headroom. This part is Active status and suitable for new designs. Selection is appropriate for applications requiring enhanced reliability, automotive compliance, or improved thermal performance.

SS1FL4HM3/H (Similar Manufacturer Part): This Vishay part matches the 1 A current rating with improved forward voltage characteristics (500 mV versus 550 mV) and reduced reverse leakage current (200 µA versus 400 µA). Extended operating temperature range (-55 to 150°C) and AEC-Q101 automotive qualification provide design flexibility. This part is Active status and suitable for new designs. Selection is appropriate for applications requiring lower power dissipation or automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can SS14L RUG be directly replaced with SS14L in Cut Tape format?

A: Direct electrical substitution is possible as both parts share identical specifications (40 V, 1 A, 550 mV forward voltage, DO-219AB package). However, SS14L is designated "Not For New Designs," restricting its use to replacement or legacy applications only. Packaging format differs (Cut Tape & Digi-Reel® versus Tape & Reel), which may affect procurement and assembly processes.

Q: What are the key differences between SS14L RUG and the Vishay alternatives?

A: Both Vishay parts (SL04-HM3-08 and SS1FL4HM3/H) maintain the 40 V reverse voltage rating and DO-219AB package compatibility. SL04-HM3-08 provides higher current capacity (1.1 A) with significantly lower reverse leakage (20 µA). SS1FL4HM3/H offers lower forward voltage (500 mV) and reduced reverse leakage (200 µA). Both include AEC-Q101 automotive qualification and Active product status, making them suitable for new designs.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts use the DO-219AB (Sub SMA) package, which maintains identical physical dimensions and PCB footprint compatibility. Surface mount assembly processes remain unchanged across all alternatives.

Q: Which substitute part should be selected for automotive applications?

A: Both Vishay parts (SL04-HM3-08 and SS1FL4HM3/H) carry AEC-Q101 automotive qualification. SL04-HM3-08 is recommended for applications requiring maximum current capacity (1.1 A) and lowest reverse leakage. SS1FL4HM3/H is recommended for applications prioritizing lower forward voltage and power dissipation.

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

A: This designation indicates the part is in mature or declining production phase. While electrically equivalent, it should not be selected for new product development. Existing designs using this part may continue to source it for production, but new applications should select Active status alternatives such as SL04-HM3-08 or SS1FL4HM3/H.

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

A: Reverse leakage current directly impacts power dissipation and circuit efficiency. SS14L RUG and SS14L specify 400 µA at 40 V, while SL04-HM3-08 specifies 20 µA and SS1FL4HM3/H specifies 200 µA. Lower reverse leakage reduces standby power consumption and heat generation, particularly in high-temperature or high-voltage applications.

Q: Are all parts RoHS3 compliant?

A: All listed parts (SS14L RUG, SS14L, SL04-HM3-08, and SS1FL4HM3/H) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

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