SS19 R3G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS19 R3G is a 90V, 1A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AC (SMA) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements. The part operates across a junction temperature range of -55°C to 150°C with fast recovery characteristics suitable for switching applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 90 V
Package / Case	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS19 R3G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 90 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Mounting Type: Surface Mount
Fast Recovery Speed: ≤ 500ns, > 200mA (Io)

Package Compatibility Levels:

Direct Package Match (DO-214AC/SMA): Parts maintaining identical DO-214AC (SMA) package footprint and pinout provide direct PCB compatibility without layout modification.
Alternative Surface Mount Packages (DO-214BA, SMB): Parts in DO-214BA or SMB packages maintain surface mount compatibility but require PCB footprint adjustment. These packages accommodate the same electrical specifications while offering different thermal and mechanical characteristics.
Current Rating Elevation: Parts rated at 1.5A average rectified current exceed the 1A requirement of the SS19 R3G and function as direct electrical substitutes with enhanced current capacity.

Compliance Considerations:

RoHS3 compliance status determines suitability for regulated applications
Operating temperature range must accommodate application requirements
Reverse leakage current specifications must not exceed system design limits

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Temp Range	RoHS Status	Product Status
SS19 R3G	Taiwan Semiconductor Corporation	90 V	1 A	800 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Discontinued
HSM190JE3/TR13	Microchip Technology	90 V	1 A	840 mV @ 1 A	DO-214BA	-55°C ~ 175°C	ROHS3 Compliant	Active
B190B-13	Diodes Incorporated	90 V	1 A	790 mV @ 1 A	DO-214AA (SMB)	-65°C ~ 150°C	RoHS Non-Compliant	Discontinued
B190B-13-F	Diodes Incorporated	90 V	1 A	790 mV @ 1 A	DO-214AA (SMB)	-65°C ~ 150°C	ROHS3 Compliant	Active
BYS11-90-E3/TR	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS11-90-E3/TR3	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS11-90-M3/TR	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS11-90-M3/TR3	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS12-90-E3/TR	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS12-90-E3/TR3	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active
BYS12-90-M3/TR	Vishay General Semiconductor - Diodes Division	90 V	1.5 A	750 mV @ 1 A	DO-214AC (SMA)	-55°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Package, Active Status):

The Vishay General Semiconductor BYS11 and BYS12 series diodes in DO-214AC (SMA) package provide direct PCB compatibility with the SS19 R3G. All variants (BYS11-90-E3/TR, BYS11-90-E3/TR3, BYS11-90-M3/TR, BYS11-90-M3/TR3, BYS12-90-E3/TR, BYS12-90-E3/TR3, BYS12-90-M3/TR) maintain 90V reverse voltage rating and fast recovery characteristics. These parts are ROHS3 compliant and carry active product status. The 1.5A current rating exceeds the 1A requirement, providing design margin. Forward voltage at 1A is 750 mV, which is 50 mV lower than the SS19 R3G specification, resulting in reduced power dissipation.

Tier 2 - Alternative Package, Active Status:

The Microchip Technology HSM190JE3/TR13 operates at 90V, 1A with DO-214BA package. This part is ROHS3 compliant and active. The DO-214BA package requires PCB footprint modification but maintains surface mount compatibility. Operating temperature range extends to 175°C, exceeding the SS19 R3G specification. Forward voltage is 840 mV at 1A, which is 40 mV higher than the original part.

The Diodes Incorporated B190B-13-F provides 90V, 1A operation in SMB package with ROHS3 compliance and active status. This part requires PCB layout adjustment for the larger SMB footprint. Forward voltage is 790 mV at 1A, which is 10 mV lower than the SS19 R3G. Operating temperature range is -65°C to 150°C.

Tier 3 - Discontinued Status:

The Diodes Incorporated B190B-13 is discontinued at DiGi Electronics and carries RoHS non-compliance status, making it unsuitable for new designs requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the BYS11-90-E3/TR3 directly replace the SS19 R3G without PCB modification?

A: Yes. Both parts use the DO-214AC (SMA) package with identical footprint and pinout. The BYS11-90-E3/TR3 maintains 90V reverse voltage rating, exceeds the 1A current requirement at 1.5A, and operates within the same temperature range. ROHS3 compliance matches the original part specification.

Q: What is the difference between BYS11 and BYS12 series diodes?

A: Both series are manufactured by Vishay General Semiconductor and share identical electrical specifications: 90V reverse voltage, 1.5A average rectified current, 750 mV forward voltage at 1A, and DO-214AC (SMA) package. The designation difference reflects internal manufacturing or product line categorization but does not affect electrical performance or substitution suitability.

Q: Why do some substitute parts have higher forward voltage than the SS19 R3G?

A: Forward voltage variation within the Schottky diode technology is determined by semiconductor junction design and manufacturing process. The HSM190JE3/TR13 specifies 840 mV at 1A compared to the SS19 R3G at 800 mV. This 40 mV difference results in approximately 40 mW additional power dissipation at 1A operation. System thermal design must accommodate this variance.

Q: Is the HSM190JE3/TR13 suitable for applications requiring the -55°C to 150°C temperature range?

A: The HSM190JE3/TR13 operates from -55°C to 175°C, which encompasses the SS19 R3G temperature range. The extended upper temperature limit provides additional design margin for high-temperature applications.

Q: What is the significance of the tape and reel (TR) packaging designation?

A: Tape and reel packaging indicates the component is supplied on continuous carrier tape wound on a reel, suitable for automated assembly processes. This packaging format does not affect electrical performance or substitution compatibility. Both tape and reel and bulk packaging options may be available for active parts.

Q: Can the B190B-13-F SMB package substitute for the SS19 R3G SMA package on existing PCBs?

A: No direct PCB substitution is possible without layout modification. The SMB package is physically larger than the SMA package and requires different PCB footprint dimensions. However, the B190B-13-F provides equivalent electrical performance: 90V reverse voltage, 1A current rating, and ROHS3 compliance. PCB redesign is necessary for implementation.

Q: Why is the B190B-13 (non-compliant version) listed if it is discontinued and non-compliant?

A: The B190B-13 is included for reference purposes only to document the product lineage. The B190B-13-F is the current compliant alternative from Diodes Incorporated. New designs must use the B190B-13-F variant to meet ROHS3 compliance requirements.

Q: What reverse leakage current specification applies to all substitute parts?

A: All substitute parts listed maintain 100 µA reverse leakage current at 90V, matching the SS19 R3G specification. The exception is the B190B-13 and B190B-13-F series, which specify 500 µA at 90V. This higher leakage current must be evaluated against system design requirements for low-power or high-impedance applications.

Q: Are all substitute parts rated for fast recovery operation?

A: Yes. All substitute parts specified in this reference maintain fast recovery characteristics with switching speed ≤ 500ns at currents greater than 200mA, matching the SS19 R3G specification. This ensures compatibility with switching power supply and high-frequency rectification applications.

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