LSIC2SD120A05 SiC Schottky Diode 1200V 17.5A TO-220AC Equivalent & Substitute Parts

Part Overview

The LSIC2SD120A05 is a Silicon Carbide (SiC) Schottky rectifier diode manufactured by Littelfuse Inc., rated for 1200V DC reverse voltage and 17.5A average rectified current in a Through Hole TO-220AC package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

SiC Schottky diodes in the 1200V class are used in high-efficiency power conversion applications including PFC circuits, solar inverters, and industrial power supplies where zero reverse recovery time and low forward voltage drop are critical performance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	1200	V
Current - Average Rectified (Io)	17.5	A
Voltage - Forward (Vf) Maximum @ If	1.8 V @ 5 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-220-2	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LSIC2SD120A05 is determined by the following mandatory electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 1200V (exact match required)
Technology: SiC (Silicon Carbide) Schottky (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: TO-220-2 or compatible TO-220 variant (mechanical compatibility required)
Operating Temperature Range: -55°C to 175°C minimum (equal or wider range acceptable)
RoHS Compliance: ROHS3 or equivalent (regulatory requirement)

Secondary Compatibility Parameters:

Current - Average Rectified (Io): Substitute must equal or exceed 17.5A
Voltage - Forward (Vf) Maximum: Substitute must not exceed 1.8V at rated current
Reverse Recovery Time (trr): Substitute must maintain 0ns characteristic (SiC technology inherent)

Substitute parts are grouped into two categories based on current rating:

Category A - Direct Current Match (17.5A to 20A): C4D05120A (19A), FFSP20120A (20A)

Category B - Higher Current Capability (24.5A and above): C4D08120A (24.5A), C4D10120A (33A), C4D15120A (43.5A), C4D20120A (54.5A)

Category C - Lower Current Capability (8A to 15A): C4D02120A (10A), FFSP08120A (8A), FFSP10120A (10A), FFSP15120A (15A)

All substitute parts maintain 1200V reverse voltage rating, SiC Schottky technology, Through Hole mounting, and TO-220-2 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Io (A)	Vf Max @ If (V)	Vr Max (V)	Ir @ Vr (µA)	Package	Status
LSIC2SD120A05	Littelfuse Inc.	17.5	1.8 @ 5A	1200	100 @ 1200V	TO-220AC	Obsolete
C4D02120A	Wolfspeed, Inc.	10	1.8 @ 2A	1200	50 @ 1200V	TO-220-2	Active
C4D05120A	Wolfspeed, Inc.	19	1.8 @ 5A	1200	150 @ 1200V	TO-220-2	Active
C4D08120A	Wolfspeed, Inc.	24.5	1.8 @ 7.5A	1200	250 @ 1200V	TO-220-2	Active
C4D10120A	Wolfspeed, Inc.	33	1.8 @ 10A	1200	250 @ 1200V	TO-220-2	Active
C4D15120A	Wolfspeed, Inc.	43.5	1.8 @ 15A	1200	200 @ 1200V	TO-220-2	Active
C4D20120A	Wolfspeed, Inc.	54.5	1.8 @ 20A	1200	200 @ 1200V	TO-220-2	Active
FFSP08120A	onsemi	8	1.75 @ 8A	1200	200 @ 1200V	TO-220-2L	Active
FFSP10120A	onsemi	10	1.75 @ 10A	1200	200 @ 1200V	TO-220-2L	Active
FFSP15120A	onsemi	15	1.75 @ 15A	1200	200 @ 1200V	TO-220-2L	Active
FFSP20120A	onsemi	20	1.75 @ 20A	1200	200 @ 1200V	TO-220-2L	Active

Engineering Selection Recommendations

For Direct Replacement (17.5A Application Requirement):

C4D05120A (Wolfspeed, Inc.) is the primary substitute. This part matches the 17.5A requirement with 19A rated current, maintains identical forward voltage characteristics (1.8V @ 5A), and is in Active product status with ROHS3 compliance. The TO-220-2 package is mechanically compatible with the original TO-220AC footprint.

FFSP20120A (onsemi) is an alternative direct replacement with 20A current rating and Active status. Forward voltage is marginally lower at 1.75V @ 20A. TO-220-2L package variant maintains mechanical compatibility.

For Higher Current Margin Applications:

C4D08120A through C4D20120A provide progressively higher current ratings (24.5A to 54.5A) while maintaining all electrical specifications. These are suitable when design margins or future current requirements exceed 17.5A. All are Active status with ROHS3 compliance.

For Current-Constrained Applications:

C4D02120A (10A) and FFSP10120A (10A) are suitable only if application current is confirmed below 10A. These parts reduce thermal dissipation but sacrifice current headroom.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 export classification matching the original part. Operating temperature range (-55°C to 175°C) is identical across all candidates. Moisture sensitivity level (MSL 1 - Unlimited) for Wolfspeed and onsemi parts provides superior handling characteristics compared to the original part specification.

Frequently Asked Questions (FAQ)

Q1: Can FFSP20120A replace LSIC2SD120A05 in a 17.5A application?

Yes. FFSP20120A is rated for 20A average rectified current, exceeding the 17.5A requirement. Forward voltage is 1.75V @ 20A, which is lower than the original 1.8V @ 5A specification. Both parts use SiC Schottky technology with 0ns reverse recovery time. TO-220-2L package is mechanically compatible with TO-220AC footprint. onsemi part is Active status with ROHS3 compliance.

Q2: What is the difference between TO-220AC and TO-220-2L packages?

TO-220AC and TO-220-2 are functionally equivalent two-lead Through Hole packages with identical pin spacing and thermal characteristics. The "-2L" designation in TO-220-2L indicates a specific lead form variant. All three package designations (TO-220AC, TO-220-2, TO-220-2L) are mechanically interchangeable on standard PCB layouts designed for TO-220 components.

Q3: Why do some substitute parts have lower reverse leakage current (Ir)?

Reverse leakage current variation (50µA to 250µA @ 1200V) reflects manufacturing process differences between Littelfuse, Wolfspeed, and onsemi SiC Schottky diode lines. Lower leakage (C4D02120A at 50µA) indicates tighter process control but does not affect functional compatibility. All values remain within acceptable limits for 1200V SiC Schottky technology.

Q4: Is C4D05120A a direct equivalent to LSIC2SD120A05?

C4D05120A is the closest functional equivalent. It provides 19A current rating (exceeding 17.5A requirement by 8.6%), identical forward voltage specification (1.8V @ 5A), and matching 1200V reverse voltage. Both use SiC Schottky technology with 0ns reverse recovery time. C4D05120A is Active status with superior MSL rating (1 - Unlimited vs. Not Applicable). TO-220-2 package is mechanically compatible.

Q5: Can lower-rated parts like C4D02120A or FFSP10120A be used?

Lower-rated parts (10A or 8A) are suitable only if application current is confirmed below their rated value with adequate design margin. Using a 10A part in a 17.5A application will cause excessive junction temperature rise and component failure. Current rating must equal or exceed application requirement.

Q6: What is the advantage of higher-rated substitutes like C4D20120A?

Higher-rated parts (C4D20120A at 54.5A) provide increased thermal margin and design flexibility for future current increases. They maintain identical voltage and temperature specifications while reducing junction temperature at 17.5A operation. This extends component life and improves reliability in thermally constrained designs. Trade-off is higher capacitance (1500pF vs. 310pF) which may affect high-frequency circuit performance.

Q7: Are all substitute parts ROHS3 compliant?

Yes. All listed substitute parts carry ROHS3 compliance certification. The original LSIC2SD120A05 is also ROHS3 compliant. This ensures regulatory compatibility for EU and equivalent markets.

Q8: What is the impact of capacitance differences between parts?

Capacitance varies from 167pF (C4D02120A) to 1500pF (C4D20120A) depending on current rating. Higher capacitance increases switching losses in high-frequency applications (>100kHz). For standard 50/60Hz or low-frequency rectification, capacitance difference is negligible. For high-frequency PFC or resonant converter applications, lower-capacitance parts (C4D02120A, C4D05120A) may provide better efficiency.

Q9: Is the Littelfuse LSIC2SD120A05 still available despite Obsolete status?

The original part shows 744 pieces in stock as New Original. However, Obsolete status indicates no future production. Substitute parts from Wolfspeed (C4D series) and onsemi (FFSP series) are in Active production with significantly higher inventory (1,266 to 8,683 pieces), ensuring long-term availability and supply chain stability.

Q10: Which substitute offers the best balance for general 1200V 17.5A applications?

C4D05120A (Wolfspeed, Inc.) provides optimal balance: 19A current rating (8.6% margin above 17.5A requirement), identical forward voltage (1.8V @ 5A), Active production status, ROHS3 compliance, and 8,683 pieces in stock. TO-220-2 package is standard and widely supported. This part is recommended as the primary substitute for most applications.

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