SS19LH Equivalent & Substitute Parts

Part Overview

The SS19LH is a 1A, 90V Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in SOD-123 surface mount packaging. This component is classified as not for new designs, indicating its legacy status in the product lifecycle. The part is automotive-grade and AEC-Q101 qualified, suitable for applications requiring fast recovery rectification in temperature ranges from -55°C to 150°C junction temperature.

Due to its discontinued design status, identifying equivalent substitute parts with compatible electrical and mechanical characteristics is necessary for ongoing maintenance, repair, and legacy system support. Substitute parts must maintain functional equivalence while meeting or exceeding the original specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	90	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 1 A	mV
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	50 µA @ 90 V	µA
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the SS19LH is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reverse voltage rating must equal or exceed 90V
Average rectified current must equal or exceed 1A
Forward voltage drop must not exceed 800 mV at 1A
Fast recovery speed characteristic (≤ 500ns, > 200mA)
Reverse leakage current characteristics suitable for the application

Mechanical Compatibility Requirements:

Surface mount technology
Package form factor compatible with SOD-123 or equivalent footprints
Operating temperature range -55°C to 150°C junction temperature

Compliance Requirements:

Automotive-grade classification
AEC-Q101 qualification
RoHS3 compliance
REACH compliance status

The SS110LWH qualifies as a manufacturer-recommended substitute because it meets or exceeds all critical electrical parameters while maintaining automotive-grade qualification and AEC-Q101 certification. The substitute exhibits improved reverse leakage characteristics and higher reverse voltage rating, making it functionally superior for legacy system replacement applications.

Parameter Comparison

Parameter	SS19LH (Main Part)	SS110LWH (Substitute)	Compatibility
Voltage - DC Reverse (Vr) (Max)	90 V	100 V	Substitute exceeds requirement
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	800 mV @ 1 A	800 mV @ 1 A	Equivalent
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	≤ 500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	50 µA @ 90 V	10 µA @ 100 V	Substitute improves performance
Technology	Schottky	Schottky	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	SOD-123	SOD-123W	Compatible footprint
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	Equivalent
Grade	Automotive	Automotive	Equivalent
Qualification	AEC-Q101	AEC-Q101	Equivalent
Product Status	Not For New Designs	Active	Substitute is current production

Engineering Selection Recommendations

The SS110LWH is the manufacturer-recommended substitute for the SS19LH based on the following engineering criteria:

Electrical Performance: The SS110LWH maintains identical forward voltage characteristics and fast recovery speed while providing a 10V higher reverse voltage rating (100V versus 90V). The reverse leakage current is reduced to 10 µA at 100V, representing improved performance over the original 50 µA at 90V specification.

Product Lifecycle Status: The SS19LH carries a "Not For New Designs" designation, indicating end-of-life status. The SS110LWH is classified as "Active" in current production, ensuring long-term availability and supply chain continuity for replacement applications.

Compliance and Certification: Both parts maintain automotive-grade classification and AEC-Q101 qualification, ensuring suitability for automotive applications. Both parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Package Compatibility: The SS110LWH uses SOD-123W packaging, which is mechanically compatible with SOD-123 footprints on printed circuit boards. The wider lead configuration of SOD-123W provides improved mechanical robustness without requiring PCB redesign.

Inventory Availability: The SS110LWH has significantly higher inventory availability (36,843 pieces) compared to the SS19LH (635 pieces), supporting reliable procurement for ongoing production and repair operations.

Frequently Asked Questions (FAQ)

Q: Can the SS110LWH directly replace the SS19LH without circuit modification?

A: Yes. The SS110LWH is electrically and mechanically compatible with the SS19LH. The substitute maintains identical forward voltage drop, recovery speed, and current rating. The higher reverse voltage rating (100V versus 90V) and improved reverse leakage characteristics present no compatibility issues in circuits designed for the original 90V specification.

Q: What is the difference between SOD-123 and SOD-123W packaging?

A: SOD-123W is a wider variant of the SOD-123 package. Both packages are surface mount diode packages with identical electrical performance and pin spacing. The SOD-123W provides a wider body profile, improving mechanical stability during assembly and handling. PCB footprints designed for SOD-123 accommodate SOD-123W components without modification.

Q: Why does the SS110LWH have lower reverse leakage current than the SS19LH?

A: The SS110LWH exhibits 10 µA reverse leakage at 100V compared to 50 µA at 90V for the SS19LH. This represents improved semiconductor material quality and manufacturing process control in the current production part. Lower reverse leakage reduces power dissipation and improves circuit efficiency.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SS19LH and SS110LWH are automotive-grade components with AEC-Q101 qualification. The SS110LWH, being in active production, maintains current automotive qualification standards and supply chain traceability required for automotive original equipment manufacturer and aftermarket applications.

Q: What is the significance of the "Not For New Designs" status on the SS19LH?

A: This designation indicates the SS19LH has reached end-of-life status and is no longer recommended for new product development. Existing inventory remains available for legacy system support and repair. The SS110LWH is the recommended replacement for all new applications and ongoing production requirements.

Q: Do both parts have identical operating temperature ranges?

A: Yes. Both the SS19LH and SS110LWH operate across the identical junction temperature range of -55°C to 150°C, ensuring thermal compatibility in all specified operating environments.

Q: Is circuit board redesign required to use the SS110LWH as a substitute?

A: No circuit redesign is required. The SOD-123W package is mechanically compatible with SOD-123 footprints. The electrical characteristics are equivalent or superior to the original specification. Direct component substitution on existing PCBs is supported.

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