SDT20100CT Equivalent & Substitute Parts

Part Overview

The SDT20100CT is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with 100V reverse voltage rating and 10A average rectified current per diode. The device is packaged in TO-220-3 through-hole configuration and is currently active in production. Equivalent and substitute parts are necessary to address supply chain requirements, inventory availability, and design flexibility while maintaining electrical and mechanical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io) (per Diode)	10A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SDT20100CT are selected based on strict electrical and mechanical parameter compatibility. The following criteria determine substitution eligibility:

Primary Compatibility Criteria:

Diode Configuration: 1 Pair Common Cathode (mandatory)
Technology: Schottky (mandatory)
Voltage - DC Reverse (Vr) (Max): 100 V (mandatory)
Mounting Type: Through Hole (mandatory)
Package / Case: TO-220-3 (mandatory)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory)

Secondary Compatibility Criteria:

Current - Average Rectified (Io) (per Diode): Equal to or greater than 10A
Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Operating Temperature - Junction: Minimum -55°C, maximum 150°C or higher
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts may exceed the 10A current rating, as higher current capability does not compromise circuit operation. Forward voltage variations within the Schottky diode technology range are acceptable for rectification applications. Parts with extended temperature ranges or improved reverse leakage characteristics provide additional design margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Temp Range (Tj)	Package	Status
SDT20100CT	Diodes Incorporated	100 V	10A	700 mV @ 10 A	-55°C ~ 150°C	TO-220-3	Active
DST30100C	Littelfuse Inc.	100 V	10A	750 mV @ 15 A	-55°C ~ 150°C	TO-220-3	Active
MBR10100CT	Taiwan Semiconductor Corporation	100 V	10A	950 mV @ 10 A	-55°C ~ 150°C	TO-220-3	Discontinued at DiGi Electronics
MBR20100CTP	Littelfuse Inc.	100 V	10A	900 mV @ 10 A	-55°C ~ 150°C	TO-220-3	Active
MBR20H100CT-E3/45	Vishay General Semiconductor - Diodes Division	100 V	10A	770 mV @ 10 A	-65°C ~ 150°C	TO-220-3	Active
NTST40100CTG	onsemi	100 V	20A	800 mV @ 20 A	-40°C ~ 150°C	TO-220-3	Obsolete
NTSV30H100CTG	onsemi	100 V	15A	850 mV @ 15 A	-40°C ~ 150°C	TO-220-3	Obsolete
STPS60H100CT	STMicroelectronics	100 V	30A	840 mV @ 30 A	-55°C ~ 175°C	TO-220-3	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

DST30100C (Littelfuse Inc.) - Preferred substitute with active product status. Maintains 100V reverse voltage and 10A current rating. Forward voltage of 750 mV @ 15 A is within acceptable Schottky diode operating range. Temperature range matches original specification. ROHS3 compliant with MSL 1 rating.

MBR20100CTP (Littelfuse Inc.) - Active substitute with 100V reverse voltage and 10A current rating. Forward voltage of 900 mV @ 10 A represents higher conduction loss but remains within Schottky technology parameters. Temperature range matches original specification. ROHS3 compliant with MSL 1 rating. Higher inventory availability (16,330 pcs).

MBR20H100CT-E3/45 (Vishay General Semiconductor - Diodes Division) - Active substitute with 100V reverse voltage and 10A current rating. Forward voltage of 770 mV @ 10 A is comparable to original part. Extended temperature range (-65°C ~ 150°C) provides additional design margin. ROHS3 compliant with MSL 1 rating. Excellent reverse leakage characteristics (4.5 µA @ 100 V).

STPS60H100CT (STMicroelectronics) - Active substitute with 100V reverse voltage and 30A current rating. Exceeds original 10A specification, providing design margin for higher current applications. Forward voltage of 840 mV @ 30 A is within acceptable range. Extended maximum junction temperature (175°C) and superior reverse leakage (10 µA @ 100 V). ROHS3 compliant with MSL 1 rating. Highest inventory availability (90,300 pcs).

Substitutes with Limitations (Obsolete Status):

NTST40100CTG (onsemi) - Obsolete product status. 20A current rating exceeds original 10A specification. Minimum junction temperature of -40°C does not meet original -55°C specification. Forward voltage of 800 mV @ 20 A is acceptable. Use only when active alternatives are unavailable.

NTSV30H100CTG (onsemi) - Obsolete product status. 15A current rating exceeds original 10A specification. Minimum junction temperature of -40°C does not meet original -55°C specification. Forward voltage of 850 mV @ 15 A is acceptable. Use only when active alternatives are unavailable.

MBR10100CT (Taiwan Semiconductor Corporation) - Discontinued at DiGi Electronics. Forward voltage of 950 mV @ 10 A represents significant conduction loss increase compared to original 700 mV specification. Use only when active alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can STPS60H100CT replace SDT20100CT in all applications?

A: STPS60H100CT is electrically compatible as a substitute. The 30A current rating exceeds the original 10A specification, which does not compromise circuit operation. The 100V reverse voltage rating matches exactly. Forward voltage characteristics are within acceptable Schottky diode operating parameters. The extended temperature range (-55°C ~ 175°C) provides additional design margin. Mechanical compatibility is confirmed through identical TO-220-3 packaging.

Q: What is the significance of forward voltage differences between substitute parts?

A: Forward voltage variations among Schottky diodes are inherent to the technology and manufacturing process. The original SDT20100CT specifies 700 mV @ 10 A. Substitute parts range from 750 mV to 950 mV depending on manufacturer and current rating. Higher forward voltage results in increased power dissipation during conduction. Circuit thermal design must accommodate the specific forward voltage of the selected substitute. For applications with tight thermal budgets, DST30100C (750 mV) or MBR20H100CT-E3/45 (770 mV) are preferred over MBR10100CT (950 mV).

Q: Are obsolete parts acceptable substitutes?

A: Obsolete parts (NTST40100CTG, NTSV30H100CTG) meet electrical parameter requirements but carry supply chain risk. These parts are no longer in active production. Use obsolete substitutes only when active alternatives are unavailable and existing inventory is confirmed. Active substitutes (DST30100C, MBR20100CTP, MBR20H100CT-E3/45, STPS60H100CT) are recommended for new designs and long-term production requirements.

Q: Does current rating affect substitution compatibility?

A: Current rating affects substitution eligibility only when the substitute rating is lower than the original 10A specification. Substitute parts with equal or higher current ratings (10A, 15A, 20A, 30A) are compatible. Higher current ratings provide design margin and do not compromise circuit operation. The circuit will draw only the current required by the application, regardless of the device's maximum rating.

Q: What is the impact of temperature range differences?

A: The original SDT20100CT operates from -55°C to 150°C junction temperature. Substitute parts with identical or extended ranges are compatible. MBR20H100CT-E3/45 extends the minimum to -65°C and STPS60H100CT extends the maximum to 175°C. Substitutes with reduced minimum temperature (NTST40100CTG, NTSV30H100CTG at -40°C) do not meet the original specification and are acceptable only for applications that do not require -55°C operation.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original SDT20100CT. This ensures compatibility with modern manufacturing processes and environmental regulations.

Q: Can MBR10100CT be used despite discontinuation?

A: MBR10100CT is discontinued at DiGi Electronics but may be available through alternative distributors. The primary concern is forward voltage of 950 mV @ 10 A, which is 250 mV higher than the original 700 mV specification. This results in significantly higher power dissipation. Use MBR10100CT only when active alternatives are unavailable and thermal design accommodates the increased dissipation.

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