LFUSCD04065A Silicon Carbide Schottky Diode 650V 4A TO-220AC Equivalent & Substitute Parts

Part Overview

The LFUSCD04065A is a silicon carbide (SiC) Schottky diode manufactured by Littelfuse Inc., rated for 650V DC reverse voltage and 4A average rectified current in a through-hole TO-220AC package. This diode is designed for high-efficiency rectification applications requiring zero reverse recovery time and low forward voltage drop characteristics inherent to SiC technology. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the original LFUSCD04065A is unavailable, when alternative manufacturers are preferred for supply chain diversification, or when application requirements allow for higher current ratings within the same voltage class and package family.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	650	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 4 A	V
Reverse Recovery Time (trr)	0	ns
Current - Reverse Leakage @ Vr	170	µA @ 650 V
Technology	SiC (Silicon Carbide) Schottky	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LFUSCD04065A is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 650V
Technology: SiC (Silicon Carbide) Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2 or compatible TO-220 variant
Reverse Recovery Time (trr): 0 ns (no recovery time > 500mA)

Allowable Variation Parameters:

Current - Average Rectified (Io): Equal to or greater than 4A
Voltage - Forward (Vf) (Max): Equal to or less than 1.7V at rated current
Current - Reverse Leakage @ Vr: Equal to or less than 170µA at 650V
Operating Temperature - Junction: Equal to or greater than 175°C maximum

Substitute parts meeting these criteria maintain electrical and thermal compatibility while potentially offering improved performance characteristics such as higher current capacity, lower forward voltage, or reduced reverse leakage current. All substitute parts listed are active production components with RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	Status
LFUSCD04065A	Littelfuse Inc.	650	4	1.7 @ 4A	0	170 @ 650V	175	TO-220-2	Active
C3D04065A	Wolfspeed, Inc.	650	13.5	1.8 @ 4A	0	60 @ 650V	175	TO-220-2	Active
C3D06065A	Wolfspeed, Inc.	650	19	1.8 @ 6A	0	60 @ 650V	175	TO-220-2	Active
C3D08065A	Wolfspeed, Inc.	650	24	1.8 @ 8A	0	60 @ 650V	175	TO-220-2	Active
C3D10065A	Wolfspeed, Inc.	650	30	1.8 @ 10A	0	60 @ 650V	175	TO-220-2	Active
C3D12065A	Wolfspeed, Inc.	650	35	1.8 @ 12A	0	74 @ 650V	175	TO-220-2	Active
C3D16065A	Wolfspeed, Inc.	650	39	1.8 @ 16A	0	95 @ 650V	175	TO-220-2	Active
FFSP3065A	onsemi	650	30	1.75 @ 30A	≤500	200 @ 650V	175	TO-220-2	Active
IDH04G65C5XKSA2	Infineon Technologies	650	4	1.7 @ 4A	0	70 @ 650V	175	TO-220-2	Active
IDH04G65C6XKSA1	Infineon Technologies	650	12	1.35 @ 4A	0	14 @ 420V	175	TO-220-2	Active
IDH06G65C6XKSA1	Infineon Technologies	650	16	1.35 @ 6A	0	20 @ 420V	175	TO-220-2	Active

Engineering Selection Recommendations

Direct Equivalents (Identical Current Rating):

The IDH04G65C5XKSA2 (Infineon Technologies CoolSiC™+ series) is a direct electrical equivalent to the LFUSCD04065A, offering identical 4A current rating, 650V reverse voltage, and 1.7V forward voltage at 4A. Both parts feature zero reverse recovery time and are RoHS3 compliant with unlimited MSL. This part is suitable for one-to-one replacement in existing designs.

Higher Current Capacity Substitutes:

All Wolfspeed C3D series parts (C3D04065A through C3D16065A) and the Infineon IDH04G65C6XKSA1 and IDH06G65C6XKSA1 provide current ratings exceeding the original 4A specification while maintaining 650V voltage rating and zero reverse recovery time. These parts are suitable for applications where the original design margin allows for higher current capacity or where thermal management permits operation at higher current levels. All Wolfspeed Z-Rec® series parts are RoHS3 compliant.

Alternative Technology Consideration:

The FFSP3065A (onsemi) operates at 650V and 30A but features fast recovery time (≤500ns) rather than zero recovery time. This part is suitable only for applications where fast recovery characteristics are acceptable and where the higher reverse leakage current (200µA) does not impact circuit performance.

Compliance and Availability:

All listed substitute parts maintain RoHS3 compliance. Wolfspeed C3D12065A and C3D16065A carry REACH Affected status. All parts are in active production with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated diode as a substitute for the LFUSCD04065A?

A: Yes. Any substitute part with equal or higher current rating (Io ≥ 4A), identical 650V reverse voltage rating, zero reverse recovery time, and TO-220-2 package is electrically compatible. Higher current ratings provide design margin and do not degrade circuit performance in applications designed for 4A operation.

Q: What is the significance of reverse recovery time in substitution?

A: The LFUSCD04065A specifies zero reverse recovery time (trr = 0 ns), which is characteristic of SiC Schottky diodes. Substitute parts must maintain this specification for equivalent switching performance and efficiency. The FFSP3065A, with fast recovery time (≤500ns), is not a direct equivalent and should not be used in applications requiring zero recovery time characteristics.

Q: Are Wolfspeed C3D series parts direct replacements?

A: Wolfspeed C3D series parts (C3D04065A, C3D06065A, C3D08065A, C3D10065A, C3D12065A, C3D16065A) are electrically compatible substitutes with identical 650V rating and zero reverse recovery time. They feature improved specifications including lower reverse leakage current (60µA vs. 170µA) and higher current capacity. All are packaged in TO-220-2 and are suitable for direct substitution where current capacity permits.

Q: What is the difference between TO-220AC and TO-220-2 packaging?

A: TO-220AC and TO-220-2 refer to the same physical package form factor used for through-hole mounting. Both designations describe a three-lead package with identical pin spacing and mounting characteristics. Parts specified as TO-220-2 or TO-220AC are mechanically and electrically interchangeable.

Q: Can I substitute the Infineon IDH04G65C6XKSA1 for the LFUSCD04065A?

A: The IDH04G65C6XKSA1 is electrically compatible with superior performance characteristics: 12A current rating (vs. 4A), lower forward voltage (1.35V @ 4A vs. 1.7V @ 4A), and significantly lower reverse leakage current (14µA @ 420V). It is suitable for direct substitution in applications where the design accommodates higher current capacity. Both parts feature zero reverse recovery time and are RoHS3 compliant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. Two Wolfspeed parts (C3D12065A and C3D16065A) are marked as REACH Affected; all others are REACH Unaffected. Compliance status should be verified against specific procurement requirements.

Q: What inventory levels are available for substitute parts?

A: Inventory availability varies by part number. Wolfspeed C3D10065A offers the highest inventory (16,580 pcs), while Wolfspeed C3D12065A offers the lowest among substitutes (2,510 pcs). Infineon and onsemi parts range from 1,869 to 3,546 pcs. Current inventory should be confirmed with the supplier for procurement planning.

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