LSIC2SD120E40CC SiC Schottky Diode Equivalent & Substitute Parts

Part Overview

The LSIC2SD120E40CC is a Silicon Carbide (SiC) Schottky diode manufactured by Littelfuse Inc., rated for 1200 V DC reverse voltage with 54.5 A average rectified current. This single diode component is housed in a TO-247-3 through-hole package and features zero reverse recovery time, characteristic of SiC Schottky technology. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	1200	V
Current - Average Rectified (Io)	54.5	A
Voltage - Forward (Vf) Maximum @ If	1.8 V @ 20 A	V @ A
Reverse Recovery Time (trr)	0	ns
Current - Reverse Leakage @ Vr	100	µA @ 1200 V
Technology	SiC Schottky	—
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
Operating Temperature - Junction	-55 to 175	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LSIC2SD120E40CC is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain 1200 V DC reverse voltage rating to ensure equivalent blocking capability in the application circuit.

Current Rating: The original part specifies 54.5 A average rectified current. Substitute parts are grouped by current capacity: the Littelfuse LSIC2SD120E40CCA (55 A) provides direct current-level equivalence, while Wolfspeed Z-Rec® and onsemi FFSH series parts offer lower current ratings (8 A to 27 A) suitable for applications with reduced current requirements.

Package Configuration: All substitute parts use TO-247-3 through-hole packaging, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsinking arrangements.

Technology Platform: All substitutes employ SiC Schottky technology, maintaining zero or near-zero reverse recovery time and low forward voltage characteristics.

Forward Voltage: Substitute parts specify forward voltage between 1.75 V and 1.8 V at rated current, within acceptable operating margins.

Reverse Leakage: Leakage current ranges from 100 µA to 250 µA at 1200 V, consistent with SiC Schottky device characteristics.

Product Status: The original part is obsolete; all listed substitutes carry active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (per Diode) A	Vf (Max) @ If	trr (ns)	Ir @ Vr (µA)	Configuration	Package	Status
LSIC2SD120E40CC	Littelfuse	1200	54.5	1.8 @ 20 A	0	100 @ 1200 V	Single Diode	TO-247-3	Obsolete
LSIC2SD120E40CCA	Littelfuse	1200	55	1.8 @ 20 A	0	100 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
C4D10120D	Wolfspeed	1200	9	1.8 @ 5 A	0	150 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
C4D15120D	Wolfspeed	1200	24.5	1.8 @ 8 A	0	250 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
C4D20120D	Wolfspeed	1200	16	1.8 @ 10 A	0	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
C4D30120D	Wolfspeed	1200	21.5	1.8 @ 15 A	0	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
C4D40120D	Wolfspeed	1200	27	1.8 @ 20 A	0	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
FFSH15120ADN-F155	Fairchild Semiconductor	1200	8	1.75 @ 8 A	≤500	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
FFSH20120ADN-F155	onsemi	1200	10	1.75 @ 10 A	≤500	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
FFSH30120ADN-F155	onsemi	1200	15	1.75 @ 15 A	≤500	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active
FFSH40120ADN-F155	onsemi	1200	20	1.75 @ 20 A	≤500	200 @ 1200 V	1 Pair Common Cathode	TO-247-3	Active

Engineering Selection Recommendations

Direct Equivalent (Current-Level Match): The LSIC2SD120E40CCA from Littelfuse provides the closest functional equivalence to the obsolete LSIC2SD120E40CC. Both devices deliver 1200 V blocking voltage and approximately 55 A current capacity. The LSIC2SD120E40CCA is active and carries AEC-Q101 automotive qualification, supporting applications requiring automotive-grade reliability. This part is the primary recommendation for direct replacement in existing designs.

Current-Reduced Substitutes (Wolfspeed Z-Rec® Series): The C4D40120D (27 A), C4D30120D (21.5 A), and C4D20120D (16 A) from Wolfspeed maintain 1200 V voltage rating and zero reverse recovery time. These parts are suitable for applications where the circuit current requirement is lower than the original 54.5 A specification. All Wolfspeed Z-Rec® parts carry active product status and ROHS3 compliance.

Current-Reduced Substitutes (onsemi FFSH Series): The FFSH40120ADN-F155 (20 A), FFSH30120ADN-F155 (15 A), and FFSH20120ADN-F155 (10 A) from onsemi provide 1200 V blocking voltage with reduced current ratings. These parts specify fast recovery characteristics (≤500 ns) and forward voltage of 1.75 V. All FFSH parts are active, ROHS3 compliant, and REACH unaffected.

Lower Current Alternatives: The C4D10120D (9 A) and FFSH15120ADN-F155 (8 A) are available for applications with significantly reduced current demands. These parts maintain full 1200 V voltage rating and SiC Schottky technology benefits.

Compliance and Availability: All recommended substitutes carry active product status, ensuring procurement continuity. Littelfuse and onsemi parts include ROHS3 compliance certification. Wolfspeed Z-Rec® parts provide high inventory availability (866,467 units for C4D40120D), supporting volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can the LSIC2SD120E40CCA directly replace the obsolete LSIC2SD120E40CC in existing designs?

A: Yes. The LSIC2SD120E40CCA maintains identical 1200 V voltage rating, equivalent 55 A current capacity, matching forward voltage (1.8 V @ 20 A), and identical TO-247-3 package. No circuit modifications are required. The part is active and carries AEC-Q101 automotive qualification.

Q: What is the difference between single-diode and diode-array configurations in the substitute list?

A: The original LSIC2SD120E40CC is a single diode. All listed substitutes are diode arrays configured as 1 Pair Common Cathode. In applications using only one diode element, the second diode remains unused. The common cathode configuration allows independent use of either diode element. PCB layout and heatsinking remain compatible with the TO-247-3 package.

Q: Can lower-current parts (C4D20120D at 16 A, FFSH40120ADN-F155 at 20 A) substitute for the 54.5 A original part?

A: Lower-current substitutes are applicable only if the circuit design operates below their rated current. These parts maintain 1200 V voltage rating and SiC Schottky technology. Circuit analysis must confirm that peak and average current demands do not exceed the substitute part's rating. Thermal management and heatsinking design must be re-evaluated for the lower current capacity.

Q: What is the significance of reverse recovery time (trr) in these SiC Schottky diodes?

A: The original LSIC2SD120E40CC specifies 0 ns reverse recovery time. Wolfspeed Z-Rec® parts also specify 0 ns. onsemi FFSH series parts specify fast recovery ≤500 ns. Zero recovery time is characteristic of SiC Schottky technology and reduces switching losses. Parts with ≤500 ns recovery time remain within acceptable performance margins for most applications but may exhibit slightly higher switching losses compared to zero-recovery devices.

Q: Are there differences in reverse leakage current among the substitute options?

A: Yes. The original part specifies 100 µA @ 1200 V. Wolfspeed C4D series parts range from 150 µA to 250 µA. onsemi FFSH series parts specify 200 µA. Littelfuse LSIC2SD120E40CCA specifies 100 µA. Higher leakage current increases standby power dissipation. For applications sensitive to leakage, the Littelfuse LSIC2SD120E40CCA or lower-current Wolfspeed parts (C4D10120D, C4D20120D) are preferred.

Q: What packaging and thermal considerations apply when substituting these parts?

A: All substitute parts use TO-247-3 through-hole packaging, maintaining identical PCB footprint and heatsink interface. Thermal performance depends on current rating and heatsink design. Lower-current substitutes (8 A to 27 A) generate less heat than the original 54.5 A part, potentially allowing reduced heatsink size. Conversely, if the original heatsink was sized for 54.5 A operation, it remains adequate for any lower-current substitute.

Q: Which substitute part offers the best inventory availability?

A: The Wolfspeed C4D40120D carries the highest inventory level at 866,467 units. The C4D40120D provides 27 A current capacity, suitable for applications requiring moderate current reduction from the original 54.5 A specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for electronic components.

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