SD945-T Equivalent & Substitute Parts

Part Overview

The SD945-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 45 V DC reverse voltage and 9 A average rectified current in a through-hole DO-201AD axial package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Equivalent parts must maintain electrical performance within the specified voltage and current parameters while accommodating different package technologies and form factors.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	9 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 18 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SD945-T are grouped based on the following critical electrical and mechanical parameters:

Voltage Rating: All substitutes maintain the 45 V DC reverse voltage specification, ensuring compatibility in circuits designed for this voltage class.

Current Rating: Substitute parts are rated at 8 A or 10 A average rectified current. The SD945-T operates at 9 A, placing it within the range of available alternatives. Parts rated at 8 A provide conservative operation; parts rated at 10 A provide additional margin.

Technology: Substitutes include both Schottky and Super Barrier diode technologies. Both technologies support fast recovery characteristics (≤ 500ns) required for the application.

Mounting Type: Substitutes are available in through-hole axial packages (compatible with original mounting) and surface-mount PowerDI™ 5 packages (requiring circuit board redesign).

Temperature Range: All substitutes support the -65°C to 150°C operating range or exceed it, ensuring thermal compatibility.

Compliance: All substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Parameter Comparison

Parameter	SD945-T (Main)	SBR10U45SP5-13	80SQ045NG	80SQ045NRLG
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	onsemi
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	9 A	10 A	8 A	8 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 18 A	470 mV @ 10 A	550 mV @ 8 A	550 mV @ 8 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V	300 µA @ 45 V	1 mA @ 45 V	1 mA @ 45 V
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	PowerDI™ 5	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 125°C
Technology	Schottky	Super Barrier	Schottky	Schottky
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Through-Hole Axial Mounting (Direct Form Factor Replacement):

The 80SQ045NG and 80SQ045NRLG from onsemi are through-hole axial Schottky diodes rated at 45 V and 8 A. Both parts are active products with ROHS3 compliance. The 80SQ045NG is supplied in bulk packaging, while the 80SQ045NRLG is supplied in cut tape format. The 80SQ045NG supports an extended operating temperature range to 175°C, providing additional thermal margin. The 80SQ045NRLG is rated to 125°C, which remains within the original SD945-T specification of 150°C. Both parts exhibit lower reverse leakage current (1 mA @ 45 V) compared to the SD945-T (800 µA @ 45 V), indicating improved leakage characteristics. The 8 A current rating is conservative relative to the 9 A SD945-T specification.

For Surface-Mount Applications (Form Factor Change):

The SBR10U45SP5-13 from Diodes Incorporated is a Super Barrier diode rated at 45 V and 10 A in a surface-mount PowerDI™ 5 package. This part is an active product with ROHS3 compliance and provides the highest current rating (10 A) among available substitutes. The forward voltage drop is reduced to 470 mV @ 10 A, indicating improved efficiency. Reverse leakage current is 300 µA @ 45 V, lower than the original part. This substitute requires circuit board redesign to accommodate surface-mount technology and the PowerDI™ 5 package footprint.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and EAR99 export classification. The 80SQ045NRLG offers the highest inventory availability (8200 pcs) in cut tape format, suitable for automated assembly. The SBR10U45SP5-13 provides substantial inventory (25200 pcs) for high-volume production. The 80SQ045NG is available in bulk format (1384 pcs).

Frequently Asked Questions (FAQ)

Q: Can the 80SQ045NG or 80SQ045NRLG directly replace the SD945-T without circuit modification?

A: Yes, both onsemi parts are through-hole axial Schottky diodes with identical 45 V voltage ratings and compatible DO-201AA/DO-27 axial packages. The 8 A current rating is conservative relative to the 9 A SD945-T specification. No circuit board redesign is required. Mechanical mounting and electrical connections are compatible.

Q: What is the difference between the 80SQ045NG and 80SQ045NRLG?

A: Both parts are electrically identical 45 V, 8 A Schottky diodes with the same electrical characteristics. The primary differences are packaging format (80SQ045NG is supplied in bulk; 80SQ045NRLG is supplied in cut tape) and maximum operating temperature (80SQ045NG: -65°C to 175°C; 80SQ045NRLG: -65°C to 125°C). For applications operating within the -65°C to 125°C range, either part is suitable. The 80SQ045NRLG in cut tape format is preferred for automated assembly processes.

Q: Why is the SBR10U45SP5-13 listed as a substitute if it requires surface-mount technology?

A: The SBR10U45SP5-13 is electrically equivalent to the SD945-T, meeting the 45 V voltage and 9 A current requirements with a 10 A rating. It is listed as a substitute for applications where circuit board redesign to surface-mount technology is feasible. This substitute offers improved efficiency (lower forward voltage drop) and lower reverse leakage current. It is not suitable for direct replacement in existing through-hole designs without PCB modification.

Q: How do the reverse leakage currents compare among substitutes?

A: The SD945-T exhibits 800 µA reverse leakage at 45 V. The SBR10U45SP5-13 exhibits 300 µA, and both onsemi parts (80SQ045NG and 80SQ045NRLG) exhibit 1 mA. Lower reverse leakage current indicates reduced power dissipation in reverse bias conditions. The onsemi parts, despite higher absolute leakage values, remain within acceptable limits for most applications.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed (SBR10U45SP5-13, 80SQ045NG, and 80SQ045NRLG) are ROHS3 compliant, matching the compliance status of the original SD945-T.

Q: What is the difference between Schottky and Super Barrier diode technologies?

A: Both technologies are fast-recovery rectifier diodes. The SD945-T uses Schottky technology; the SBR10U45SP5-13 uses Super Barrier technology. Super Barrier diodes typically exhibit lower forward voltage drops and reduced reverse leakage compared to conventional Schottky diodes. Both technologies support the fast recovery characteristics (≤ 500ns) required for this application.

Q: Which substitute part offers the best thermal performance?

A: The 80SQ045NG supports the widest operating temperature range (-65°C to 175°C), providing 25°C additional margin above the original SD945-T specification (-65°C to 150°C). This extended range offers improved thermal headroom for high-temperature applications.

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