SB390-T Equivalent & Substitute Parts

Part Overview

The SB390-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 90 V DC reverse voltage and 3 A average rectified current in a DO-201AD through-hole axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SB390-T serves applications requiring fast recovery Schottky diode performance with moderate voltage and current ratings in through-hole configurations.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	790 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 90 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the SB390-T is determined by the following critical parameters:

Voltage Rating: The reverse voltage (Vr) must equal or exceed 90 V. Substitute parts rated at 100 V satisfy this requirement with margin.

Current Rating: The average rectified current (Io) must equal or exceed 3 A. Substitute parts rated at 3 A or higher are acceptable.

Forward Voltage: Forward voltage drop (Vf) at rated current must be compatible with circuit design. The SB390-T specifies 790 mV @ 3 A; substitutes with Vf up to 850 mV @ rated current remain functionally equivalent.

Recovery Speed: All substitutes must maintain fast recovery characteristics (≤ 500ns, > 200mA).

Package and Mounting: Through-hole axial packages (DO-201AD, DO-201AA, DO-27) are mechanically and electrically interchangeable.

Reverse Leakage: Leakage current specifications vary among substitutes but remain within acceptable ranges for Schottky diode applications.

Operating Temperature: The SB390-T operates from -65°C to 150°C. Substitutes with equal or wider temperature ranges are acceptable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range	Status
SB390-T	Diodes Incorporated	90 V	3 A	790 mV @ 3 A	500 µA @ 90 V	DO-201AD	-65°C ~ 150°C	Obsolete
MBR3100RLG	onsemi	100 V	3 A	790 mV @ 3 A	600 µA @ 100 V	DO-201AA, DO-27	-65°C ~ 175°C	Active
SB12100-TP	Micro Commercial Co	100 V	12 A	850 mV @ 12 A	500 µA @ 100 V	DO-201AD	-65°C ~ 150°C	Active
SB12100-AP	Micro Commercial Co	100 V	12 A	850 mV @ 12 A	500 µA @ 100 V	DO-201AD	-65°C ~ 150°C	Active
SB12100-BP	Micro Commercial Co	100 V	12 A	850 mV @ 12 A	500 µA @ 100 V	DO-201AD	-65°C ~ 150°C	Active
SR3010-AP	Micro Commercial Co	100 V	3 A	850 mV @ 3 A	1 mA @ 100 V	DO-201AD	-55°C ~ 125°C	Active
SR3010-BP	Micro Commercial Co	100 V	3 A	850 mV @ 3 A	1 mA @ 100 V	DO-201AD	-55°C ~ 125°C	Active
SB390 (Diotec)	Diotec Semiconductor	90 V	3 A	780 mV @ 3 A	600 µA @ 90 V	DO-201AA, DO-27	-50°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: The SB390 from Diotec Semiconductor is a parametric equivalent with identical voltage and current ratings (90 V, 3 A) and matching forward voltage characteristics (780 mV @ 3 A). This part is active and ROHS3 compliant, providing the closest functional replacement for the obsolete SB390-T.

Voltage-Upgraded Substitutes: MBR3100RLG from onsemi and SR3010 variants from Micro Commercial Co provide 100 V reverse voltage ratings, exceeding the SB390-T specification. MBR3100RLG maintains identical forward voltage (790 mV @ 3 A) and extends the operating temperature range to 175°C. SR3010-AP and SR3010-BP operate at 3 A with 100 V rating but exhibit higher forward voltage (850 mV @ 3 A) and reduced temperature range (-55°C ~ 125°C).

Higher Current Capacity Substitutes: SB12100-TP, SB12100-AP, and SB12100-BP from Micro Commercial Co provide 12 A current capacity at 100 V reverse voltage. These parts are suitable for applications requiring higher current handling while maintaining the same package form factor (DO-201AD). Forward voltage increases to 850 mV @ 12 A due to higher current rating.

Compliance and Availability: All recommended substitutes are active products with ROHS3 compliance and EAR99 classification. MBR3100RLG offers the widest temperature range (-65°C ~ 175°C) and is available in higher quantities (50,400 pcs). Micro Commercial Co parts (SB12100 and SR3010 series) are available in moderate quantities (637–1,041 pcs).

Frequently Asked Questions (FAQ)

Q: Can the SB390-T be directly replaced with the Diotec SB390?

A: Yes. The Diotec SB390 is a parametric equivalent with matching 90 V reverse voltage and 3 A current ratings. Both parts use Schottky technology, fast recovery characteristics, and through-hole axial packaging. The Diotec part is active and ROHS3 compliant, making it the primary direct replacement.

Q: What is the difference between 3 A and 12 A rated substitutes?

A: The SB12100 series (12 A rating) provides higher current capacity than the original SB390-T (3 A). These parts are electrically and mechanically compatible but are designed for applications requiring greater current handling. The 12 A rating does not degrade performance in 3 A applications; it provides design margin.

Q: Are DO-201AD, DO-201AA, and DO-27 packages interchangeable?

A: Yes. These are all through-hole axial package designations for Schottky diodes. DO-201AD, DO-201AA, and DO-27 are mechanically and electrically compatible for PCB mounting and circuit operation.

Q: How does forward voltage affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. The SB390-T specifies 790 mV @ 3 A. Substitutes with Vf up to 850 mV @ rated current remain functionally equivalent for most applications. Higher forward voltage results in slightly increased power dissipation and heat generation.

Q: What is the significance of reverse leakage current?

A: Reverse leakage current (Ir) represents the small current flowing through the diode when reverse biased. The SB390-T specifies 500 µA @ 90 V. Substitutes with leakage up to 1 mA @ 100 V remain acceptable for standard rectification applications. Higher leakage may affect precision analog circuits but is negligible in power rectification.

Q: Can I use a 100 V rated diode in place of a 90 V rated diode?

A: Yes. A higher voltage rating provides additional safety margin and does not degrade circuit performance. The 100 V substitutes (MBR3100RLG, SR3010 series, SB12100 series) are suitable for applications designed for 90 V operation.

Q: What is the operating temperature range consideration?

A: The SB390-T operates from -65°C to 150°C. Substitutes with equal or wider ranges are acceptable. SR3010 variants operate from -55°C to 125°C, which is narrower than the original. MBR3100RLG extends to 175°C, providing wider temperature coverage.

Q: Are there RoHS and REACH compliance differences among substitutes?

A: The SB390-T is ROHS3 compliant and REACH affected. MBR3100RLG is ROHS3 compliant but REACH unaffected. Micro Commercial Co parts (SB12100 and SR3010 series) are ROHS3 compliant and REACH unaffected. All substitutes meet standard industrial compliance requirements.

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