B390-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B390-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 90 V DC reverse voltage and 3 A average rectified current in a Surface Mount DO-214AB (SMC) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with minor parameter variations within acceptable engineering tolerances.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
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	—
Capacitance @ Vr, F	100 pF @ 4V, 1MHz	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C

Substitute Part Grouping Explanation

Substitution of the B390-13 is determined by the following critical parameters: Schottky technology, 90 V DC reverse voltage rating, 3 A average rectified current capacity, fast recovery speed characteristic (≤ 500ns), DO-214AB (SMC) package format, and Surface Mount mounting type. Parts are grouped into two categories:

Parametric Equivalents maintain all electrical specifications and package requirements identical to the B390-13, differing only in packaging format (Tape & Reel versus bulk) or compliance certifications.

Manufacturer Recommended Substitutes provide functional alternatives with voltage ratings of 100 V (higher than the 90 V requirement) and forward voltage drops of 850 mV (compared to 790 mV), representing acceptable derating margins for applications designed for the B390-13 specifications. These parts maintain the same 3 A current rating, fast recovery speed, DO-214AB package, and Surface Mount configuration.

Parameter Comparison

Parameter	B390-13	B390-13-F	B390Q-13-F	S310	SK310-TP	SS39
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Fairchild Semi.	Micro Commercial Co	Taiwan Semi. Corp
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	90 V	90 V	90 V	100 V	100 V	90 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	790 mV @ 3 A	790 mV @ 3 A	790 mV @ 3 A	850 mV @ 3 A	850 mV @ 3 A	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	500 µA @ 90 V	500 µA @ 90 V	500 µA @ 90 V	500 µA @ 100 V	500 µA @ 100 V	100 µA @ 90 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 125°C	-55 to 125°C	-55 to 125°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

B390-13-F and B390Q-13-F are parametric equivalents of the B390-13, maintaining identical electrical specifications (90 V, 3 A, 790 mV forward voltage). Both parts are currently in active production status. B390-13-F is available in standard Tape & Reel packaging with ROHS3 compliance. B390Q-13-F includes automotive-grade qualification (AEC-Q101) and is suitable for applications requiring automotive reliability standards. Selection between these two depends on application requirements and compliance certifications needed.

For Functional Substitution (Higher Voltage Rating):

S310 (Fairchild Semiconductor), SK310-TP (Micro Commercial Co), and SS39 (Taiwan Semiconductor Corporation) are manufacturer-recommended substitutes with 100 V reverse voltage ratings, representing a 10 V increase over the B390-13 specification. These parts maintain the 3 A current rating and fast recovery speed. Forward voltage drops increase to 850 mV, a 60 mV increase from the original specification. All three parts are in active production status and ROHS3 compliant. The higher voltage rating provides additional design margin for applications originally specified for 90 V operation. SK310-TP offers extended temperature range (-55 to 150°C) and specified capacitance characteristics (250 pF @ 4V, 1MHz).

Compliance Considerations:

The original B390-13 is RoHS non-compliant. All active substitute and equivalent parts (B390-13-F, B390Q-13-F, S310, SK310-TP, SS39) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can B390-13-F be used as a direct replacement for B390-13?

A: Yes. B390-13-F is a parametric equivalent with identical electrical specifications (90 V, 3 A, 790 mV forward voltage) and the same DO-214AB SMC package. The primary difference is packaging format (Tape & Reel) and ROHS3 compliance status. Electrical performance and mechanical compatibility are equivalent.

Q: What is the difference between B390-13-F and B390Q-13-F?

A: Both are parametric equivalents with identical electrical specifications. B390Q-13-F includes automotive-grade qualification (AEC-Q101) certification, making it suitable for automotive applications requiring specific reliability and testing standards. B390-13-F is the standard industrial-grade version. Selection depends on application requirements.

Q: Can S310, SK310-TP, or SS39 be used in place of B390-13?

A: These parts are manufacturer-recommended substitutes with functional compatibility. They maintain the 3 A current rating and fast recovery speed in the same DO-214AB SMC package. However, they have 100 V reverse voltage ratings (versus 90 V) and 850 mV forward voltage drops (versus 790 mV). These differences represent acceptable derating margins for applications designed for the B390-13. Verification of circuit performance under these parameter variations is required for specific applications.

Q: What is the significance of the 100 V rating on S310, SK310-TP, and SS39?

A: The 100 V rating is 10 V higher than the B390-13 specification. This provides additional voltage margin and allows these parts to operate safely in circuits designed for 90 V operation. The higher rating does not negatively impact performance in lower-voltage applications.

Q: How do forward voltage differences affect circuit performance?

A: The substitute parts (S310, SK310-TP, SS39) have forward voltage drops of 850 mV compared to 790 mV for the B390-13. This 60 mV difference results in slightly higher power dissipation and voltage drop across the diode during forward conduction. For most applications, this difference is within acceptable operating margins. Circuit-specific analysis is required for applications with tight voltage or thermal constraints.

Q: Are all substitute parts available in Tape & Reel packaging?

A: B390-13-F, B390Q-13-F, and SK310-TP are specified as Tape & Reel (TR) packaging. S310 and SS39 do not specify packaging format in the provided data. Packaging availability should be confirmed with the component supplier for procurement requirements.

Q: What is the operating temperature range difference?

A: B390-13, B390-13-F, and B390Q-13-F have operating temperature ranges of -55 to 125°C. S310, SK310-TP, and SS39 have extended ranges of -55 to 150°C. The extended range provides additional thermal margin for high-temperature applications but is not required for standard industrial temperature specifications.

Q: Are all parts RoHS compliant?

A: The original B390-13 is RoHS non-compliant. All active substitute and equivalent parts (B390-13-F, B390Q-13-F, S310, SK310-TP, SS39) are ROHS3 compliant. For new designs and production requiring RoHS compliance, any of the active parts are suitable.

Q: What is the capacitance specification and why does it vary?

A: Capacitance is specified at 4 V and 1 MHz. B390-13, B390-13-F, and B390Q-13-F specify 100 pF. SK310-TP specifies 250 pF. S310 and SS39 do not provide capacitance data. Higher capacitance may affect high-frequency circuit performance. For applications sensitive to junction capacitance, the lower-capacitance parts (B390-13 series) are preferred.

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