SD945-A Equivalent & Substitute Parts

Part Overview

The SD945-A is a Schottky diode manufactured by Diodes Incorporated, rated for 45V DC reverse voltage and 9A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates across a junction temperature range of -65°C to 150°C and complies with ROHS3 and REACH regulations.

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
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-65°C ~ 150°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SD945-A is determined by the following critical parameters:

Voltage Rating: The substitute must maintain a DC reverse voltage rating of 45V or higher to ensure safe operation in the original circuit application.

Current Rating: The substitute must support an average rectified current of 9A or greater to handle the design load without thermal stress.

Package Compatibility: The substitute must use the DO-201AD axial through-hole package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Speed Classification: The substitute must maintain fast recovery characteristics (≤ 500ns, > 200mA) to preserve circuit switching performance.

Temperature Range: The substitute must support the operating junction temperature range of -65°C to 150°C.

Regulatory Compliance: The substitute must maintain ROHS3 compliance and equivalent environmental certifications.

The SBR1045SD1-T meets all substitution criteria through equivalent voltage and package specifications, with enhanced current capacity and improved reverse leakage characteristics.

Parameter Comparison

Parameter	SD945-A	SBR1045SD1-T	Compatibility
Manufacturer	Diodes Incorporated	Diodes Incorporated	Same
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	Equivalent
Current - Average Rectified (Io)	9 A	10 A	Substitute Rated Higher
Voltage - Forward (Vf) (Max) @ If	570 mV @ 18 A	550 mV @ 10 A	Substitute Lower Forward Drop
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	800 µA @ 45 V	450 µA @ 45 V	Substitute Lower Leakage
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	Equivalent
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The SBR1045SD1-T is the direct substitute for the obsolete SD945-A. Both components are manufactured by Diodes Incorporated and share identical voltage ratings, package specifications, and operating temperature ranges. The SBR1045SD1-T is classified as an active product with current availability, addressing the obsolescence status of the SD945-A.

The SBR1045SD1-T provides enhanced electrical performance through a 10A current rating versus the 9A rating of the SD945-A, enabling operation with additional design margin. The forward voltage drop is reduced to 550 mV at 10A compared to 570 mV at 18A in the original part, resulting in lower power dissipation. Reverse leakage current is reduced to 450 µA at 45V, improving circuit efficiency.

Both components maintain ROHS3 compliance and identical thermal operating ranges, ensuring regulatory and thermal compatibility. The SBR1045SD1-T utilizes Super Barrier technology, representing an advancement over the standard Schottky technology of the SD945-A while maintaining full electrical and mechanical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can the SBR1045SD1-T directly replace the SD945-A in existing designs?

A: Yes. Both components share identical voltage ratings (45V), package specifications (DO-201AD axial through-hole), and operating temperature ranges (-65°C to 150°C). The SBR1045SD1-T is mechanically and electrically compatible with existing PCB layouts and assembly processes designed for the SD945-A.

Q: What are the key differences between these two diodes?

A: The SBR1045SD1-T has a higher current rating (10A versus 9A), lower forward voltage drop (550 mV @ 10A versus 570 mV @ 18A), and lower reverse leakage current (450 µA versus 800 µA at 45V). The SBR1045SD1-T uses Super Barrier technology while the SD945-A uses standard Schottky technology. The SBR1045SD1-T is an active product, whereas the SD945-A is obsolete.

Q: Are there any thermal considerations when substituting these parts?

A: Both components operate across the same junction temperature range of -65°C to 150°C. The SBR1045SD1-T exhibits lower forward voltage drop, which reduces power dissipation and thermal generation compared to the SD945-A, providing improved thermal performance in the same operating environment.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the SD945-A and SBR1045SD1-T are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Both have Moisture Sensitivity Level 1 (Unlimited).

Q: What is the packaging difference between these parts?

A: Both components use the DO-201AD axial through-hole package. The SD945-A is supplied in standard packaging, while the SBR1045SD1-T is supplied in Cut Tape (CT) packaging. Both are mechanically identical and suitable for the same PCB assembly processes.

Q: Why is the SBR1045SD1-T recommended over the SD945-A?

A: The SBR1045SD1-T is recommended because the SD945-A is classified as obsolete. The SBR1045SD1-T is an active product with established supply chain availability. It provides equivalent functionality with enhanced electrical performance characteristics and maintains full compatibility with designs originally specified for the SD945-A.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message