DST1045S-A Schottky Diode Equivalent & Substitute Parts

Part Overview

The DST1045S-A is a Schottky rectifier diode manufactured by Littelfuse Inc., rated for 45V DC reverse voltage and 10A average rectified current in a surface mount TO-277B package. This component is classified as Active product status and carries automotive-grade qualification (AEC-Q101) with ROHS3 compliance. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications of the original device, enabling design flexibility, supply chain alternatives, and component availability management in production environments.

Key Parameters

Parameter	DST1045S-A Specification
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	10 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 10 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V
Mounting Type	Surface Mount
Package / Case	TO-277, 3-PowerDFN
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the DST1045S-A are categorized based on the following substitution criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 45V
Current - Average Rectified (Io): Equal to or greater than 10A
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: TO-277, 3-PowerDFN compatible
Operating Temperature Range: Minimum -55°C to maximum ≥150°C

Substitution Categories:

Parametric Equivalents — Parts with identical or near-identical electrical specifications and the same base product lineage from the same manufacturer (Littelfuse Inc.):

DST1040S-A: Identical voltage, current, and thermal specifications; same package; differs in REACH status
DST1045S: Identical electrical specifications; alternative packaging format (Cut Tape & Digi-Reel); minor capacitance variation (639pF vs 656pF)

Manufacturer Recommended Equivalents — Parts from alternative manufacturers meeting or exceeding the primary electrical specifications:

FSV1045V (onsemi): Matches 45V/10A ratings; lower forward voltage (440mV vs 570mV); lower reverse leakage (220µA vs 800µA); Not For New Designs status
FSV1550V (onsemi): Exceeds ratings at 50V/15A; higher operating temperature maximum (155°C); Not For New Designs status
FSV2050V (onsemi): Exceeds ratings at 50V/20A; Active product status
MBR1045ULPS-TP (Micro Commercial Co): Matches 45V/10A ratings; lower forward voltage (470mV); Obsolete status
MBR10U45L-TP (Micro Commercial Co): Matches 45V/10A ratings; lower forward voltage (470mV); Active product status
PMEG045T050EPDZ (Nexperia USA Inc.): Matches 45V voltage; reduced current rating (5A); automotive-grade with AEC-Q101; different package variant (CFP15); lower reverse leakage (44µA)
TSP10H45S (Taiwan Semiconductor Corporation): Matches 45V/10A ratings; identical forward voltage (570mV); lower reverse leakage (150µA); Active product status; alternative package variant (TO-277A SMPC)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Grade
DST1045S-A	Littelfuse Inc.	45 V	10 A	570 mV @ 10 A	800 µA @ 45 V	TO-277B	Active	Automotive
DST1040S-A	Littelfuse Inc.	45 V	10 A	570 mV @ 10 A	800 µA @ 45 V	TO-277B	Active	Automotive
DST1045S	Littelfuse Inc.	45 V	10 A	570 mV @ 10 A	800 µA @ 45 V	TO-277B	Active	Not specified
FSV1045V	onsemi	45 V	10 A	440 mV @ 10 A	220 µA @ 45 V	TO-277-3	Not For New Designs	Not specified
FSV1550V	onsemi	50 V	15 A	510 mV @ 15 A	320 µA @ 50 V	TO-277-3	Not For New Designs	Not specified
FSV2050V	onsemi	50 V	20 A	550 mV @ 20 A	320 µA @ 50 V	TO-277-3	Active	Not specified
MBR1045ULPS-TP	Micro Commercial Co	45 V	10 A	470 mV @ 10 A	250 µA @ 45 V	TO-277-3	Obsolete	Not specified
MBR10U45L-TP	Micro Commercial Co	45 V	10 A	470 mV @ 10 A	500 µA @ 45 V	TO-277-3	Active	Not specified
PMEG045T050EPDZ	Nexperia USA Inc.	45 V	5 A	465 mV @ 5 A	44 µA @ 45 V	CFP15	Active	Automotive
TSP10H45S	Taiwan Semiconductor Corporation	45 V	10 A	570 mV @ 10 A	150 µA @ 45 V	TO-277A	Active	Not specified

Engineering Selection Recommendations

Direct Equivalents (Recommended for Immediate Substitution):

DST1040S-A and DST1045S are direct parametric equivalents manufactured by Littelfuse Inc. with identical electrical specifications to the DST1045S-A. Both maintain Active product status and ROHS3 compliance. DST1040S-A differs only in REACH status (REACH Affected vs. REACH Unaffected). DST1045S offers alternative packaging (Cut Tape & Digi-Reel) while maintaining identical electrical performance. These parts are suitable for direct substitution without circuit redesign.

Cross-Manufacturer Alternatives (Active Product Status):

FSV2050V (onsemi) and MBR10U45L-TP (Micro Commercial Co) maintain Active product status with 45V/10A ratings. FSV2050V exceeds the current specification at 20A and voltage specification at 50V, providing design margin. MBR10U45L-TP matches the 45V/10A specification with lower forward voltage (470mV vs 570mV), reducing power dissipation. Both are suitable for new designs.

TSP10H45S (Taiwan Semiconductor Corporation) provides an Active alternative with identical 45V/10A ratings and forward voltage matching the DST1045S-A, with improved reverse leakage characteristics (150µA vs 800µA). Package variant is TO-277A (SMPC) rather than TO-277B.

Conditional Alternatives (Not For New Designs or Obsolete Status):

FSV1045V and FSV1550V carry "Not For New Designs" status and are not recommended for new product development. MBR1045ULPS-TP is Obsolete and should not be selected for ongoing production.

Current-Limited Alternative:

PMEG045T050EPDZ (Nexperia USA Inc.) is rated for 5A average rectified current, which is below the 10A specification of the DST1045S-A. This part is suitable only for applications requiring ≤5A current. It offers automotive-grade qualification (AEC-Q101) and significantly lower reverse leakage (44µA). Package is CFP15 variant.

Frequently Asked Questions (FAQ)

Q: Can DST1040S-A be used as a direct replacement for DST1045S-A?

A: Yes. DST1040S-A is a parametric equivalent with identical voltage (45V), current (10A), forward voltage (570mV @ 10A), and reverse leakage (800µA @ 45V) specifications. Both are manufactured by Littelfuse Inc., carry Active product status, and use the same TO-277B package. The only difference is REACH status (DST1040S-A is REACH Affected; DST1045S-A is REACH Unaffected). Verify REACH compliance requirements for your application before substitution.

Q: What is the difference between DST1045S and DST1045S-A?

A: DST1045S and DST1045S-A have identical electrical specifications (45V, 10A, 570mV forward voltage). The primary difference is packaging format: DST1045S is supplied in Cut Tape (CT) & Digi-Reel format, while DST1045S-A is supplied in Tape & Reel (TR) format. Capacitance specification shows minor variation (639pF vs 656pF @ 5V, 1MHz). Both are Active products with ROHS3 compliance.

Q: Can FSV2050V replace DST1045S-A in my circuit?

A: FSV2050V exceeds the DST1045S-A specifications with 50V reverse voltage and 20A current rating compared to 45V/10A. The part is electrically compatible and maintains Active product status. However, verify that your PCB layout and thermal management accommodate the higher current capability. FSV2050V is manufactured by onsemi and uses TO-277-3 package variant.

Q: Why is PMEG045T050EPDZ listed as a substitute if it only handles 5A?

A: PMEG045T050EPDZ is included as a substitute for applications where the circuit current requirement does not exceed 5A. It matches the 45V reverse voltage specification and offers superior performance characteristics including lower reverse leakage (44µA vs 800µA), automotive-grade qualification (AEC-Q101), and faster reverse recovery time (24ns). The CFP15 package differs from TO-277B, requiring PCB layout verification.

Q: What does "Not For New Designs" status mean for FSV1045V and FSV1550V?

A: "Not For New Designs" indicates that the manufacturer (onsemi) no longer recommends these parts for new product development. While existing inventory may be available, these parts are in end-of-life phase. For new designs, select alternatives with Active product status such as FSV2050V, MBR10U45L-TP, or TSP10H45S.

Q: Are all substitute parts automotive-grade qualified?

A: No. Only DST1045S-A, DST1040S-A, and PMEG045T050EPDZ carry automotive-grade designation with AEC-Q101 qualification. Other substitutes (FSV series, MBR series, TSP10H45S) do not specify automotive-grade qualification. For automotive applications, verify qualification requirements with your design specifications before substitution.

Q: What is the significance of reverse leakage current differences between substitutes?

A: Reverse leakage current affects power dissipation and circuit performance at operating temperature. DST1045S-A specifies 800µA @ 45V, while alternatives range from 44µA (PMEG045T050EPDZ) to 800µA (DST1040S-A). Lower reverse leakage reduces standby power consumption and heat generation. Higher reverse leakage may require thermal management review in power-sensitive applications.

Q: Can I use TSP10H45S in place of DST1045S-A without PCB modification?

A: TSP10H45S matches the electrical specifications (45V, 10A, 570mV forward voltage) and maintains the same TO-277 package family. However, the supplier device package is TO-277A (SMPC) rather than TO-277B. Verify pin compatibility and PCB footprint alignment with your design before substitution. Contact the component supplier for detailed package drawings if uncertainty exists.

Q: What is the operating temperature range difference between DST1045S-A and FSV1550V?

A: DST1045S-A operates from -55°C to 150°C junction temperature. FSV1550V extends the maximum junction temperature to 155°C. This 5°C difference is minor and does not typically affect circuit design. Both parts maintain the same minimum operating temperature (-55°C).

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