LSIC2SD120C05 Equivalent & Substitute Parts

Part Overview

The LSIC2SD120C05 is a 1200 V, 18.1 A SiC (Silicon Carbide) Schottky diode manufactured by Littelfuse Inc., housed in a TO-252 (DPAK) surface mount package. This component is classified as obsolete, indicating that direct replacement with active production alternatives is necessary for new designs and ongoing procurement requirements. The part operates across a junction temperature range of -55°C to 175°C and features zero reverse recovery time, characteristic of SiC Schottky technology. Substitution is required due to product discontinuation and the need for components with active manufacturing status and current supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1200	V
Current - Average Rectified (Io)	18.1	A
Voltage - Forward (Vf) (Max) @ If	1.8 V @ 5 A	V @ A
Reverse Recovery Time (trr)	0	ns
Current - Reverse Leakage @ Vr	100	µA @ 1200 V
Technology	SiC (Silicon Carbide) Schottky	-
Mounting Type	Surface Mount	-
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	-
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the LSIC2SD120C05 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage rating: 1200 V DC reverse voltage (Vr) minimum
Package compatibility: TO-252-3 DPAK (2 Leads + Tab) surface mount configuration
Technology: SiC (Silicon Carbide) Schottky diode
Reverse recovery time: 0 ns (no recovery time)
Operating temperature range: -55°C to 175°C minimum

Current Rating Considerations: The LSIC2SD120C05 specifies 18.1 A average rectified current. Substitute parts are grouped into three categories based on current capacity:

Lower Current Substitutes (10 A - 6 A): C4D02120E, C4D02120E-TR, S4D05120E, STPSC6H12B-TR1 — suitable for applications requiring reduced current handling
Matched Current Substitute (19 A): C4D05120E — closest current rating to the original part
Higher Current Substitutes (24.5 A - 33 A): C4D08120E, C4D08120E-TR, C4D10120E, C4D10120E-TR — suitable for applications requiring increased current capacity
Unspecified Current Substitute: FFSD10120A — active production alternative with compatible voltage and package

All substitute parts maintain 1200 V voltage rating, TO-252 package compatibility, SiC Schottky technology, and zero reverse recovery time. Forward voltage characteristics and reverse leakage specifications vary within acceptable engineering tolerances for the 1200 V SiC Schottky diode category.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	Ir @ Vr [µA @ V]	Package	Status
LSIC2SD120C05	Littelfuse Inc.	1200	18.1	1.8 @ 5	100 @ 1200	TO-252-3 DPAK	Obsolete
C4D02120E	Wolfspeed, Inc.	1200	10	1.8 @ 2	50 @ 1200	TO-252-3 DPAK	Active
C4D02120E-TR	Wolfspeed, Inc.	1200	10	1.8 @ 2	50 @ 1200	TO-252-3 DPAK	Active
C4D05120E	Wolfspeed, Inc.	1200	19	1.8 @ 5	150 @ 1200	TO-252-3 DPAK	Active
C4D08120E	Wolfspeed, Inc.	1200	24.5	3.0 @ 2	250 @ 1200	TO-252-3 DPAK	Active
C4D08120E-TR	Wolfspeed, Inc.	1200	24.5	1.8 @ 8	250 @ 1200	TO-252-3 DPAK	Active
C4D10120E	Wolfspeed, Inc.	1200	33	1.8 @ 10	250 @ 1200	TO-252-3 DPAK	Active
C4D10120E-TR	Wolfspeed, Inc.	1200	33	1.8 @ 10	250 @ 1200	TO-252-3 DPAK	Active
FFSD10120A	onsemi	1200	Not Specified	1.75 @ 10	200 @ 1200	TO-252-3 DPAK	Active
S4D05120E	SMC Diode Solutions	1200	5	1.8 @ 5	20 @ 1200	TO-252-3 DPAK	Active
STPSC6H12B-TR1	STMicroelectronics	1200	6	1.9 @ 6	400 @ 1200	TO-252-3 DPAK	Active

Engineering Selection Recommendations

Primary Recommendation: C4D05120E

The C4D05120E from Wolfspeed, Inc. is the optimal substitute for the LSIC2SD120C05. This part matches the original specification with 19 A average rectified current, exceeding the 18.1 A requirement by 4.9%. Forward voltage characteristics are identical at 1.8 V @ 5 A. The part maintains full 1200 V voltage rating, zero reverse recovery time, and TO-252-3 DPAK package compatibility. Product status is Active with ROHS3 compliance and 2201 units in stock inventory.

Secondary Recommendation: C4D08120E or C4D08120E-TR

For applications requiring increased current margin or thermal headroom, the C4D08120E series provides 24.5 A capacity. The C4D08120E-TR variant offers superior forward voltage performance at 1.8 V @ 8 A compared to the standard C4D08120E at 3.0 V @ 2 A. Both maintain full electrical compatibility with the original part. Product status is Active with ROHS3 compliance.

Alternative Recommendation: FFSD10120A

The FFSD10120A from onsemi provides an active production alternative with verified 1200 V rating and TO-252-3 DPAK package compatibility. This part features lower moisture sensitivity (MSL 1 vs. MSL 3) and REACH Unaffected status. Current rating is not specified in available documentation. Product status is Active with 7925 units in stock.

Lower Current Alternatives: C4D02120E, C4D02120E-TR, S4D05120E, STPSC6H12B-TR1

These parts are suitable only for applications where the original 18.1 A specification can be reduced. C4D02120E and C4D02120E-TR provide 10 A capacity with excellent reverse leakage characteristics (50 µA @ 1200 V). S4D05120E offers 5 A capacity with minimal reverse leakage (20 µA @ 1200 V). STPSC6H12B-TR1 provides 6 A capacity but exhibits elevated reverse leakage (400 µA @ 1200 V) and reduced operating temperature range (-40°C to 175°C).

Compliance Status:

All recommended substitutes maintain ROHS3 compliance and EAR99 ECCN classification. Wolfspeed parts are REACH Affected; onsemi FFSD10120A is REACH Unaffected; SMC and STMicroelectronics parts are REACH Affected. All parts are classified under HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q1: Can the C4D05120E directly replace the LSIC2SD120C05 without circuit modifications?

A: Yes. The C4D05120E maintains identical voltage rating (1200 V), matching forward voltage (1.8 V @ 5 A), zero reverse recovery time, and TO-252-3 DPAK package configuration. Current rating of 19 A exceeds the original 18.1 A specification. No circuit modifications are required for direct substitution.

Q2: What is the difference between C4D02120E and C4D02120E-TR?

A: Both parts are electrically identical with 10 A current rating and 1200 V voltage rating. The primary difference is packaging: C4D02120E is supplied in Tube packaging, while C4D02120E-TR is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on assembly line requirements and inventory management preferences.

Q3: Why do some substitute parts have higher current ratings than the original LSIC2SD120C05?

A: Higher current-rated parts (C4D08120E, C4D10120E) maintain full backward compatibility with the original 18.1 A specification. These parts provide additional design margin and thermal headroom for applications requiring increased reliability or future current expansion. They are suitable drop-in replacements when higher current capacity is beneficial.

Q4: Is the FFSD10120A from onsemi a suitable substitute despite unspecified current rating?

A: The FFSD10120A maintains critical electrical parameters: 1200 V voltage rating, zero reverse recovery time, and TO-252-3 DPAK package compatibility. However, the unspecified average rectified current rating introduces uncertainty for applications requiring the full 18.1 A specification. This part is suitable only when current requirements can be independently verified against onsemi technical documentation.

Q5: What is the significance of reverse leakage current differences among substitute parts?

A: Reverse leakage current (Ir) varies from 20 µA to 400 µA @ 1200 V across substitute options. Lower leakage (S4D05120E at 20 µA, C4D02120E at 50 µA) reduces standby power dissipation and heat generation. Higher leakage (STPSC6H12B-TR1 at 400 µA) increases standby power consumption. Selection depends on application duty cycle and thermal management requirements.

Q6: Are there package compatibility concerns when substituting with different manufacturers?

A: All substitute parts use TO-252-3 DPAK (2 Leads + Tab) SC-63 package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes. No package-related modifications are required for any recommended substitute.

Q7: What is the impact of moisture sensitivity level (MSL) differences?

A: The original LSIC2SD120C05 has MSL Not Applicable. Wolfspeed and SMC substitutes specify MSL 3 (168 Hours), requiring controlled storage and handling. onsemi FFSD10120A and STMicroelectronics STPSC6H12B-TR1 specify MSL 1 (Unlimited), allowing indefinite shelf storage without moisture precautions. MSL 3 parts require baking before reflow soldering if storage exceeds 168 hours at specified humidity levels.

Q8: Can lower current-rated parts (C4D02120E, S4D05120E) be used in the original LSIC2SD120C05 application?

A: Lower current-rated substitutes are suitable only if the application circuit operates below their specified current limits. C4D02120E (10 A) and S4D05120E (5 A) cannot safely handle the original 18.1 A specification. Use of undersized current ratings risks component thermal failure and circuit malfunction. These parts are appropriate only for redesigned circuits with reduced current requirements.

Q9: What compliance certifications are maintained across all substitute parts?

A: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification, matching the original LSIC2SD120C05. REACH status varies: Wolfspeed, SMC, and STMicroelectronics parts are REACH Affected; onsemi FFSD10120A is REACH Unaffected. All parts are classified under HTSUS 8541.10.0080. Compliance documentation should be verified with individual manufacturers for specific regulatory requirements.

Q10: How does forward voltage variation affect circuit performance?

A: Forward voltage specifications range from 1.75 V to 3.0 V across substitute options at different test currents. The original LSIC2SD120C05 specifies 1.8 V @ 5 A. C4D05120E, C4D08120E-TR, and C4D10120E-TR maintain this specification. C4D08120E exhibits 3.0 V @ 2 A, representing higher forward drop at lower current. Forward voltage differences directly impact power dissipation and thermal performance; selection should align with circuit current operating points.

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