SS19 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS19 is a Schottky rectifier diode manufactured by onsemi, rated for 90 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer available or procurement is limited.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	90	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 90 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

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

Voltage Rating: The reverse voltage (Vr) must be equal to or greater than 90 V. Substitutes rated at 100 V are acceptable as they provide margin above the original specification.

Current Rating: The average rectified current (Io) must be equal to or greater than 1 A. Substitutes rated at 1 A or 2 A are acceptable.

Package Compatibility: The DO-214AC (SMA) package is the primary form factor. Substitutes in the same package ensure direct board-level compatibility without layout modification.

Technology: All substitutes must be Schottky diodes to maintain fast recovery characteristics (≤ 500ns, > 200mA).

Forward Voltage: Forward voltage drop (Vf) typically ranges from 750 mV to 850 mV at rated current. Variations within this range do not prevent substitution but may affect circuit efficiency.

Reverse Leakage Current: Leakage current varies among substitutes (1 µA to 500 µA at rated Vr). Higher leakage does not prevent substitution in most applications but may affect standby power consumption.

Temperature Range: Operating temperature range varies among substitutes (-55°C to 175°C). The original SS19 operates to 125°C; substitutes with extended ranges provide additional margin.

Product Status: Active substitutes are preferred over obsolete parts for new procurement and long-term availability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Temp Range [°C]	Product Status
SS19	onsemi	90	1	850 @ 1A	200 @ 90V	DO-214AC (SMA)	-65 to 125	Not For New Designs
MBRA1H100T3G	onsemi	100	1	760 @ 1A	40 @ 100V	DO-214AC (SMA)	-65 to 175	Active
MBRS190T3G	onsemi	90	1	750 @ 1A	500 @ 90V	DO-214AA (SMB)	-65 to 175	Active
B1100-13-F	Diodes Incorporated	100	1	790 @ 1A	500 @ 100V	DO-214AC (SMA)	-65 to 150	Active
B190-13-F	Diodes Incorporated	90	1	790 @ 1A	500 @ 90V	DO-214AC (SMA)	-65 to 150	Active
B190Q-13-F	Diodes Incorporated	90	1	790 @ 1A	500 @ 90V	DO-214AC (SMA)	-65 to 155	Active
SS110-LTP	Micro Commercial Co	100	1	850 @ 1A	500 @ 100V	DO-214AC (SMA)	-55 to 150	Active
SS1H9-E3/5AT	Vishay General Semiconductor - Diodes Division	90	1	770 @ 1A	1 @ 90V	DO-214AC (SMA)	Max 175	Active
STPS1H100A	STMicroelectronics	100	1	770 @ 1A	4 @ 100V	DO-214AC (SMA)	Max 175	Active
STPS1H100AY	STMicroelectronics	100	1	770 @ 1A	4 @ 100V	DO-214AC (SMA)	-40 to 175	Active
STPS2H100A	STMicroelectronics	100	2	790 @ 2A	1 @ 100V	DO-214AC (SMA)	Max 175	Active

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (DO-214AC / SMA):

The following parts maintain identical package form factor and are suitable for direct board-level replacement without layout modification:

B190-13-F (Diodes Incorporated): Matches 90 V / 1 A rating with identical package. Active product status ensures long-term availability. Operating temperature range -65°C to 150°C covers the original SS19 specification.
B190Q-13-F (Diodes Incorporated): Automotive-grade variant of B190-13-F with AEC-Q101 qualification. Suitable for applications requiring automotive-level reliability. Operating temperature range extends to 155°C.
MBRA1H100T3G (onsemi): Rated 100 V / 1 A with lower forward voltage (760 mV) and significantly lower reverse leakage (40 µA). Extended operating temperature to 175°C. Active product status. Voltage rating provides 10 V margin above original specification.
STPS1H100AY (STMicroelectronics): Rated 100 V / 1 A with automotive-grade qualification. Forward voltage 770 mV. Reverse leakage 4 µA. Operating temperature -40°C to 175°C. Active product status with high inventory availability.
STPS1H100A (STMicroelectronics): Industrial-grade variant of STPS1H100AY. Rated 100 V / 1 A. Forward voltage 770 mV. Reverse leakage 4 µA. Maximum operating temperature 175°C. Active product status.
B1100-13-F (Diodes Incorporated): Rated 100 V / 1 A. Forward voltage 790 mV. Reverse leakage 500 µA. Operating temperature -65°C to 150°C. Active product status with high inventory availability (120,300 pcs).
SS110-LTP (Micro Commercial Co): Rated 100 V / 1 A. Forward voltage 850 mV (matches original SS19). Reverse leakage 500 µA. Operating temperature -55°C to 150°C. Active product status.
SS1H9-E3/5AT (Vishay General Semiconductor - Diodes Division): Matches 90 V / 1 A rating. Forward voltage 770 mV. Reverse leakage 1 µA (lowest among substitutes). Maximum operating temperature 175°C. Active product status.

Higher Current Substitute (DO-214AC / SMA):

STPS2H100A (STMicroelectronics): Rated 100 V / 2 A. Provides double the current capacity while maintaining the same package. Forward voltage 790 mV @ 2 A. Reverse leakage 1 µA. Maximum operating temperature 175°C. Suitable for applications requiring increased current margin or where future current demands may increase.

Alternative Package Substitute:

MBRS190T3G (onsemi): Rated 90 V / 1 A in DO-214AA (SMB) package. Larger package than original DO-214AC (SMA). Forward voltage 750 mV. Reverse leakage 500 µA. Operating temperature -65°C to 175°C. Requires board layout modification due to different package footprint. Suitable only when board space permits or when SMB package is preferred for thermal considerations.

Compliance and Certification:

All listed substitutes are ROHS3 compliant and REACH unaffected, matching the original SS19 environmental compliance status. B190Q-13-F and STPS1H100AY carry automotive-grade qualification (AEC-Q101), suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 100 V rated diode as a substitute for the 90 V SS19?

A: Yes. A 100 V reverse voltage rating is acceptable as a substitute for 90 V. The higher voltage rating provides design margin and does not degrade circuit performance. All 100 V substitutes listed (MBRA1H100T3G, B1100-13-F, SS110-LTP, STPS1H100A, STPS1H100AY, STPS2H100A) are suitable replacements.

Q: What is the difference between STPS1H100A and STPS1H100AY?

A: Both are rated 100 V / 1 A with identical electrical characteristics (770 mV forward voltage, 4 µA reverse leakage). STPS1H100AY includes automotive-grade qualification and operates over -40°C to 175°C. STPS1H100A is industrial-grade with maximum operating temperature of 175°C. Select STPS1H100AY for automotive applications; either part is acceptable for industrial applications.

Q: Can I use STPS2H100A (2 A rated) instead of SS19 (1 A rated)?

A: Yes. STPS2H100A is rated for 2 A average rectified current, which exceeds the 1 A requirement of SS19. The higher current rating provides design margin and does not prevent substitution. The part maintains the same DO-214AC (SMA) package and 100 V voltage rating. Forward voltage is specified at 2 A (790 mV), which is slightly higher than at 1 A but remains within acceptable range for most applications.

Q: Why does MBRS190T3G have a different package (SMB) than the original SS19 (SMA)?

A: MBRS190T3G uses the DO-214AA (SMB) package, which is physically larger than the DO-214AC (SMA) package of SS19. While electrically equivalent (90 V / 1 A), the SMB package requires different board footprint and cannot be used as a direct drop-in replacement without PCB layout modification. Use MBRS190T3G only when board space permits or when the larger package is preferred for thermal performance.

Q: What is the significance of the "Q" designation in B190Q-13-F?

A: The "Q" designation indicates automotive-grade qualification to AEC-Q101 standard. B190Q-13-F is suitable for automotive applications and high-reliability systems requiring automotive-level component screening and testing. For non-automotive applications, the standard B190-13-F is acceptable.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) varies among substitutes from 750 mV to 850 mV at 1 A. Lower forward voltage reduces power dissipation and heat generation. Higher forward voltage increases power dissipation. In most rectifier applications, this difference is not critical. Select substitutes with lower Vf (760–770 mV) for power-sensitive applications; select those matching the original Vf (850 mV) for direct electrical equivalence.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode's reverse recovery time is 500 nanoseconds or less when switching from forward conduction to reverse blocking at currents exceeding 200 mA. All listed substitutes meet this specification, ensuring fast switching performance suitable for high-frequency rectification and switching applications.

Q: Why do some substitutes have much lower reverse leakage current (1–4 µA) compared to SS19 (200 µA)?

A: Reverse leakage current varies due to manufacturing process differences among manufacturers. Lower leakage (1–4 µA) indicates superior reverse blocking characteristics and lower standby power consumption. Higher leakage (200–500 µA) is still acceptable for most applications. Select low-leakage substitutes (SS1H9-E3/5AT, STPS1H100A, STPS1H100AY, STPS2H100A) for battery-powered or low-power standby applications.

Q: Is the SS19 still available for purchase?

A: The SS19 is classified as "Not For New Designs" and has reached end-of-life status. While 15,200 pcs are listed as in stock, long-term availability is not guaranteed. For new designs and ongoing procurement, select an active substitute such as B190-13-F, MBRA1H100T3G, STPS1H100AY, or B1100-13-F, all of which have confirmed active product status and higher inventory levels.

Q: Can I substitute SS19 with a part rated for lower voltage (e.g., 60 V)?

A: No. A lower voltage rating is not acceptable. The diode must be rated for at least 90 V reverse voltage to safely block the maximum reverse voltage in the circuit. Using an underrated diode risks component failure and circuit damage.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) and Digi-Reel® packaging are supplied on tape in smaller quantities, suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging is supplied on full reels for automated pick-and-place assembly in high-volume production. Both formats contain the same component; the difference is in supply format and quantity. Select based on production volume and assembly method requirements.

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