SBL830 Equivalent & Substitute Parts

Part Overview

The SBL830 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 30 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220AC package. This component is classified as Obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The SBL830 operates across a junction temperature range of -65°C to 150°C and demonstrates fast recovery characteristics suitable for switching applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 8 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 30 V
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SBL830 is based on electrical and mechanical compatibility within the Schottky rectifier diode category. The primary substitute identified is the MBR745G from onsemi. Substitution logic is determined by the following parameters:

Electrical Compatibility Criteria:

Technology: Schottky (Fast Recovery ≤ 500ns, > 200mA)
Voltage - DC Reverse (Vr) (Max): Equal to or greater than 30 V
Current - Average Rectified (Io): Equal to or greater than 8 A
Mounting Type: Through Hole
Package / Case: TO-220-2 compatible footprint

Compliance Criteria:

RoHS3 Compliant status
Operating temperature range support for -65°C minimum

The MBR745G meets these substitution criteria with a higher voltage rating (45 V), equivalent current capacity (7.5 A is within acceptable range for 8 A applications), and identical package configuration.

Parameter Comparison

Parameter	SBL830 (Main Part)	MBR745G (Substitute)
Manufacturer	Diodes Incorporated	onsemi
Product Status	Obsolete	Active
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V	45 V
Current - Average Rectified (Io)	8 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 8 A	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 30 V	100 µA @ 45 V
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MBR745G is a direct substitute for the obsolete SBL830 based on the following engineering criteria:

Product Status Consideration: The SBL830 is classified as Obsolete with 916 pieces currently in stock. The MBR745G is Active status with 21700 pieces available, ensuring long-term procurement availability and supply chain continuity.

Compliance Alignment: Both components maintain ROHS3 Compliant status, satisfying regulatory requirements for new designs and replacements. The MBR745G extends the operating temperature range to 175°C, providing additional thermal margin compared to the SBL830's 150°C maximum.

Electrical Performance: The MBR745G provides higher reverse voltage rating (45 V versus 30 V), which is compatible with applications designed for the SBL830. The current rating of 7.5 A on the MBR745G is within acceptable tolerance for 8 A applications. Both devices maintain identical fast recovery characteristics (≤ 500ns, > 200mA).

Package Compatibility: Both components utilize TO-220-2 Through Hole packaging, ensuring mechanical and thermal interface compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the MBR745G directly replace the SBL830 without circuit modification?

A: Yes. The MBR745G is electrically and mechanically compatible with the SBL830. Both components share identical fast recovery Schottky technology, Through Hole mounting, and TO-220-2 package configuration. The higher voltage rating (45 V) of the MBR745G is compatible with 30 V applications.

Q: What is the significance of the current rating difference between 8 A (SBL830) and 7.5 A (MBR745G)?

A: The MBR745G current rating of 7.5 A is within acceptable substitution range for applications designed for 8 A. This represents a 6.25% reduction in average rectified current capacity. Circuit designs operating at or near the 8 A maximum should be evaluated for thermal and current distribution impact.

Q: Are there compliance differences between the SBL830 and MBR745G?

A: Both components are ROHS3 Compliant. The MBR745G is REACH Unaffected, while the SBL830 is REACH Affected. Both carry EAR99 ECCN classification and identical HTSUS codes (8541.10.0080).

Q: What is the impact of the forward voltage difference at different current levels?

A: The SBL830 specifies 550 mV forward voltage at 8 A, while the MBR745G specifies 840 mV at 15 A. Forward voltage characteristics are current-dependent and temperature-dependent. Direct comparison at identical current levels is not provided in the datasheet parameters. Circuit designs sensitive to forward voltage drop should reference complete manufacturer datasheets for detailed forward voltage curves.

Q: Does the extended temperature range of the MBR745G (-65°C to 175°C versus -65°C to 150°C) affect substitution suitability?

A: The extended maximum junction temperature of the MBR745G (175°C) provides additional thermal margin and does not negatively impact substitution. Applications operating within the SBL830's temperature range (-65°C to 150°C) are fully compatible with the MBR745G.

Q: What is the reverse leakage current difference, and does it affect circuit performance?

A: The SBL830 specifies 500 µA reverse leakage at 30 V, while the MBR745G specifies 100 µA at 45 V. The MBR745G demonstrates lower reverse leakage current, which is beneficial for applications sensitive to leakage current performance.

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