DST5100S Schottky Diode Equivalent & Substitute Parts

Part Overview

The DST5100S is a 100V, 5A Schottky rectifier diode manufactured by Littelfuse Inc., packaged in TO-277B surface mount configuration. This component is classified as Active product status and carries automotive-grade qualification (AEC-Q101). The DST5100S is designed for fast recovery applications with reverse recovery time ≤500ns and operates across a junction temperature range of -55°C to 150°C.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives meeting identical electrical and mechanical specifications. All substitute parts listed maintain compatibility with the original design parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 5 A	mV
Speed	Fast Recovery ≤500ns, >200mA (Io)	ns
Current - Reverse Leakage @ Vr	120	µA @ 100 V
Capacitance @ Vr, F	245	pF @ 5V, 1MHz
Package / Case	TO-277, 3-PowerDFN	-
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution logic for the DST5100S is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal 100V
Current - Average Rectified (Io): Must equal or exceed 5A
Technology: Must be Schottky
Package / Case: Must be TO-277, 3-PowerDFN
Operating Temperature Range: Must support -55°C to 150°C
Speed: Must maintain Fast Recovery ≤500ns, >200mA (Io)
Mounting Type: Must be Surface Mount

Substitution Categories:

Category 1: Direct Current Rating Match (5A) Parts with identical 5A current rating maintain the closest electrical and thermal characteristics to the DST5100S. These include SS5P10HM3_A/I from Vishay, which operates at the same current level with compatible package specifications.

Category 2: Higher Current Rating (8A, 10A, 12A, 15A, 20A) Parts with current ratings exceeding 5A (FSV8100V, FSV10100V, FSV12100V, FSV15100V, FSV20100V) are electrically compatible substitutes. Higher current ratings provide design margin and thermal headroom while maintaining the 100V reverse voltage specification. These parts are suitable for applications where the DST5100S current capacity is adequate but higher current handling is beneficial.

Category 3: Alternative Manufacturer with Equivalent Specifications MBR12U100L-TP from Micro Commercial Co provides a 12A rated alternative with Active product status, maintaining full compatibility with the TO-277-3 package and 100V rating.

All substitute parts maintain Schottky technology, surface mount configuration, and automotive-grade compliance where applicable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Reverse Leakage [µA @ 100V]	Package	Product Status	Grade
DST5100S	Littelfuse Inc.	100	5	750 @ 5A	120	TO-277B	Active	Automotive
SS5P10HM3_A/I	Vishay	100	5	880 @ 5A	15	TO-277A (SMPC)	Active	Automotive
FSV8100V	onsemi	100	8	670 @ 8A	50	TO-277-3	Not For New Designs	-
FSV10100V	onsemi	100	10	670 @ 10A	60	TO-277-3	Not For New Designs	-
FSV12100V	onsemi	100	12	670 @ 12A	100	TO-277-3	Not For New Designs	-
FSV15100V	onsemi	100	15	660 @ 15A	80	TO-277-3	Not For New Designs	-
FSV20100V	onsemi	100	20	660 @ 20A	80	TO-277-3	Not For New Designs	-
MBR12U100L-TP	Micro Commercial Co	100	12	600 @ 12A	500	TO-277-3	Active	-

Engineering Selection Recommendations

For New Designs: SS5P10HM3_A/I is the preferred substitute for new designs. This part maintains Active product status, carries automotive-grade qualification (AEC-Q101), and provides identical 5A current rating with the same operating temperature range (-55°C to 150°C). Both DST5100S and SS5P10HM3_A/I are ROHS3 compliant and REACH unaffected. The primary difference is package variant (TO-277B versus TO-277A SMPC), which requires PCB layout verification for compatibility.

For Existing Designs Requiring Substitution: MBR12U100L-TP from Micro Commercial Co is suitable as an alternative when supply of the DST5100S is constrained. This part maintains Active product status, 100V reverse voltage rating, and TO-277-3 package compatibility. The 12A current rating exceeds the 5A requirement, providing thermal margin. ROHS3 compliance and REACH unaffected status match the original specification.

For Higher Current Margin Applications: FSV8100V, FSV10100V, FSV12100V, FSV15100V, and FSV20100V from onsemi are electrically compatible alternatives with current ratings from 8A to 20A. These parts maintain 100V reverse voltage, fast recovery characteristics, and TO-277-3 package configuration. However, these parts carry "Not For New Designs" product status, limiting their use to legacy system support or applications where supply continuity is critical.

Compliance Considerations: All listed substitutes maintain ROHS3 compliance and REACH unaffected status. Automotive-grade qualification (AEC-Q101) is confirmed for DST5100S and SS5P10HM3_A/I only. Applications requiring automotive qualification should prioritize these two parts.

Frequently Asked Questions (FAQ)

Q1: Can FSV10100V replace DST5100S in a new design? FSV10100V carries "Not For New Designs" product status from onsemi. While electrically compatible (100V, 10A, TO-277-3 package, fast recovery), this designation indicates the manufacturer does not recommend this part for new applications. SS5P10HM3_A/I is the preferred substitute for new designs.

Q2: What is the difference between TO-277B and TO-277-3 packages? Both designations refer to the same 3-PowerDFN surface mount package family. TO-277B (DST5100S) and TO-277-3 (substitute parts) are mechanically and electrically compatible. PCB footprint verification is required to confirm layout compatibility, as minor dimensional variations may exist between manufacturers.

Q3: Why does SS5P10HM3_A/I have higher forward voltage (880 mV) than DST5100S (750 mV)? Forward voltage variation within the same current rating (5A) reflects manufacturing process differences between Littelfuse and Vishay. Both values fall within acceptable Schottky diode performance ranges. The 130 mV difference results in approximately 0.65W additional power dissipation at 5A continuous current, requiring thermal analysis for high-power applications.

Q4: Is MBR12U100L-TP suitable for applications requiring AEC-Q101 qualification? MBR12U100L-TP does not carry AEC-Q101 qualification in the provided specifications. Applications requiring automotive-grade qualification must use DST5100S or SS5P10HM3_A/I.

Q5: Can I use a 20A rated diode (FSV20100V) in place of the 5A DST5100S? FSV20100V is electrically compatible (100V rating, fast recovery, TO-277-3 package). The higher 20A current rating provides thermal margin and design flexibility. However, FSV20100V carries "Not For New Designs" status. For new applications, SS5P10HM3_A/I or MBR12U100L-TP are preferred alternatives.

Q6: What is the significance of reverse leakage current differences? Reverse leakage current varies among substitutes (15 µA for SS5P10HM3_A/I to 500 µA for MBR12U100L-TP at 100V). Lower leakage reduces standby power consumption and heat generation. Applications with stringent power budget requirements should prioritize parts with lower reverse leakage specifications.

Q7: Are all substitute parts ROHS3 compliant? Yes. All listed substitute parts (SS5P10HM3_A/I, FSV8100V, FSV10100V, FSV12100V, FSV15100V, FSV20100V, MBR12U100L-TP) maintain ROHS3 compliance and REACH unaffected status, matching the DST5100S environmental compliance profile.

Q8: What is the operating temperature range for all substitutes? All substitute parts support the same operating junction temperature range as DST5100S: -55°C to 150°C. This ensures thermal compatibility across the full application temperature envelope.

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