SD945-B Equivalent & Substitute Parts

Part Overview

The SD945-B is a Schottky diode rated for 45 V DC reverse voltage and 9 A average rectified current in a DO-201AD axial through-hole package, manufactured by Diodes Incorporated. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The part is RoHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Current - Average Rectified (Io): Must equal or exceed 9 A
Package / Case: Must be DO-201AD, Axial
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass -65°C ~ 150°C
Speed Classification: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)

Compliance Requirements:

RoHS3 Compliant status required
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The SBR1045SD1-T meets all substitution criteria as an active product with superior electrical characteristics and maintained compliance certifications.

Parameter Comparison

Parameter	SD945-B (Main Part)	SBR1045SD1-T (Substitute)
Manufacturer	Diodes Incorporated	Diodes Incorporated
Category	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Super Barrier
Voltage - DC Reverse (Vr) (Max)	45 V	45 V
Current - Average Rectified (Io)	9 A	10 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 18 A	550 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V	450 µA @ 45 V
Mounting Type	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SBR1045SD1-T is the direct substitute for the obsolete SD945-B. Both components share identical voltage and temperature specifications, identical package geometry (DO-201AD axial through-hole), and identical speed classification. The SBR1045SD1-T provides superior performance characteristics: 10 A current rating versus 9 A, lower forward voltage drop (550 mV @ 10 A versus 570 mV @ 18 A), and reduced reverse leakage current (450 µA @ 45 V versus 800 µA @ 45 V).

Both parts maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The SBR1045SD1-T carries active product status with significantly higher inventory availability (3518 pieces in stock versus 978 pieces for the obsolete SD945-B), ensuring procurement continuity and supply chain reliability.

The Super Barrier technology employed in the SBR1045SD1-T represents an advancement over the Schottky technology in the SD945-B, delivering improved electrical performance within identical mechanical and thermal constraints.

Frequently Asked Questions (FAQ)

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

A: Yes. Both components share identical voltage ratings (45 V), identical package geometry (DO-201AD axial), identical mounting type (through-hole), and identical operating temperature range (-65°C ~ 150°C). The SBR1045SD1-T provides equal or superior performance across all electrical parameters.

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

A: The SBR1045SD1-T offers higher current capacity (10 A versus 9 A), lower forward voltage drop, and reduced reverse leakage current. The SBR1045SD1-T uses Super Barrier technology versus Schottky technology in the SD945-B. Both maintain identical compliance certifications and thermal specifications.

Q: Are there any package or mounting considerations?

A: No. Both components use the DO-201AD axial package with through-hole mounting. Physical dimensions and PCB layout requirements are identical, enabling direct board-level substitution without design modification.

Q: Why is the SD945-B listed as obsolete?

A: The SD945-B is classified as obsolete by the manufacturer. The SBR1045SD1-T is the active equivalent product, ensuring long-term availability and supply chain continuity.

Q: What compliance certifications apply to both parts?

A: Both the SD945-B and SBR1045SD1-T are RoHS3 compliant and carry MSL 1 (unlimited moisture sensitivity). Both are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Is the SBR1045SD1-T available in different packaging options?

A: The SBR1045SD1-T is supplied in Cut Tape (CT) packaging. The SD945-B packaging specification was not provided in the available data.

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