STPSC406D Equivalent & Substitute Parts

Part Overview

The STPSC406D is a silicon carbide Schottky diode rated for 600 V reverse voltage and 4 A 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. The STPSC406D features zero reverse recovery time characteristic of SiC Schottky technology, suitable for high-frequency rectification applications requiring low switching losses.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.9 @ 4	V @ A
Reverse Recovery Time (trr)	0	ns
Current - Reverse Leakage @ Vr	50 @ 600	µA @ V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-40 to 175	°C
Technology	SiC (Silicon Carbide) Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STPSC406D is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Technology: SiC (Silicon Carbide) Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2 or TO-220AC
Reverse Recovery Time: 0 ns (no recovery time > 500 mA)
RoHS Compliance: ROHS3 Compliant

Allowable Parameter Ranges for Substitution:

Voltage - DC Reverse (Vr): Equal to or greater than 600 V
Current - Average Rectified (Io): Equal to or greater than 4 A
Operating Temperature - Junction: Must encompass -40°C to 175°C range
Forward Voltage (Vf): Lower or equal values preferred for efficiency

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalent (STMicroelectronics) STPSC4H065D meets all mandatory criteria with improved specifications (650 V rating, lower forward voltage, active product status).

Category 2: Cross-Manufacturer Alternatives (Wolfspeed, Infineon) Wolfspeed Z-Rec® series (C3D04065A, C3D06065A, C3D08065A, C3D10065A, C3D10065I) and Infineon CoolSiC™+ series (IDH04S60CAKSA1, IDH05SG60CXKSA1, IDH06S60CAKSA1, IDH10S60CAKSA1) provide equivalent or superior electrical performance with identical mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Ir @ Vr [µA]	Package	Status
STPSC406D	STMicroelectronics	600	4	1.9 @ 4A	50 @ 600V	TO-220AC	Obsolete
STPSC4H065D	STMicroelectronics	650	4	1.75 @ 4A	40 @ 650V	TO-220AC	Active
C3D04065A	Wolfspeed, Inc.	650	13.5	1.8 @ 4A	60 @ 650V	TO-220-2	Active
C3D06065A	Wolfspeed, Inc.	650	19	1.8 @ 6A	60 @ 650V	TO-220-2	Active
C3D08065A	Wolfspeed, Inc.	650	24	1.8 @ 8A	60 @ 650V	TO-220-2	Active
C3D10065A	Wolfspeed, Inc.	650	30	1.8 @ 10A	60 @ 650V	TO-220-2	Active
C3D10065I	Wolfspeed, Inc.	650	19	—	50 @ 650V	TO-220-2 Isolated Tab	Active
IDH04S60CAKSA1	Infineon Technologies	600	4	1.9 @ 4A	50 @ 600V	TO-220-2	Discontinued
IDH05SG60CXKSA1	Infineon Technologies	600	5	2.3 @ 5A	30 @ 600V	TO-220-2	Discontinued
IDH06S60CAKSA1	Infineon Technologies	600	6	1.7 @ 6A	80 @ 600V	TO-220-2	Discontinued
IDH10S60CAKSA1	Infineon Technologies	600	10	1.7 @ 10A	140 @ 600V	TO-220-2	Discontinued

Engineering Selection Recommendations

Primary Recommendation: STPSC4H065D

The STPSC4H065D is the manufacturer-recommended equivalent from STMicroelectronics. This part maintains identical current rating (4 A) and forward voltage characteristics while providing increased voltage margin (650 V vs. 600 V). The STPSC4H065D carries active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and supply chain stability.

Secondary Recommendations: Wolfspeed Z-Rec® Series

The C3D04065A, C3D06065A, C3D08065A, and C3D10065A from Wolfspeed provide cross-manufacturer alternatives with superior current ratings (13.5 A to 30 A) and 650 V voltage rating. These parts are suitable for applications where the STPSC406D current capacity is insufficient or where design margin is required. All Wolfspeed parts maintain zero reverse recovery time and active product status.

Alternative Consideration: Infineon CoolSiC™+ Series

The IDH04S60CAKSA1, IDH05SG60CXKSA1, IDH06S60CAKSA1, and IDH10S60CAKSA1 provide electrical equivalence at 600 V rating. These parts are discontinued at DiGi Electronics, limiting procurement viability for new designs. Selection of Infineon parts is appropriate only when existing inventory is available or when design specifications mandate CoolSiC™+ technology.

Package Consideration: TO-220-2 Isolated Tab

The C3D10065I features an isolated tab variant of the TO-220-2 package. This configuration is applicable only when thermal isolation between the diode tab and mounting surface is required. Standard TO-220-2 and TO-220AC packages are electrically and mechanically interchangeable for conventional mounting applications.

Frequently Asked Questions (FAQ)

Q: Can STPSC4H065D directly replace STPSC406D without circuit modification?

A: Yes. The STPSC4H065D is electrically compatible as a direct replacement. The 650 V rating provides additional voltage margin over the 600 V specification. Forward voltage at 4 A is lower (1.75 V vs. 1.9 V), resulting in reduced power dissipation. No circuit changes are required.

Q: Are Wolfspeed C3D series parts compatible with STPSC406D footprints?

A: Yes. All Wolfspeed C3D series parts (C3D04065A, C3D06065A, C3D08065A, C3D10065A) use TO-220-2 package with identical pin configuration and mounting hole spacing as the STPSC406D TO-220AC package. Mechanical and electrical compatibility is confirmed.

Q: What is the difference between C3D10065A and C3D10065I?

A: The C3D10065I features an isolated tab variant of the TO-220-2 package, providing electrical isolation between the diode tab and the mounting surface. The C3D10065A uses a standard TO-220-2 package with conductive tab connection. Selection depends on thermal management and isolation requirements in the application circuit.

Q: Why are Infineon IDH series parts listed as discontinued?

A: The IDH04S60CAKSA1, IDH05SG60CXKSA1, IDH06S60CAKSA1, and IDH10S60CAKSA1 are discontinued at DiGi Electronics, indicating limited availability through primary distribution channels. These parts remain suitable for applications where existing inventory is available or when design specifications mandate Infineon CoolSiC™+ technology. New designs should prioritize active-status alternatives.

Q: What are the thermal operating range differences between substitute parts?

A: The STPSC406D operates from -40°C to 175°C junction temperature. The STPSC4H065D maintains identical range (-40°C to 175°C). Wolfspeed Z-Rec® series and Infineon CoolSiC™+ series extend the lower temperature limit to -55°C, providing enhanced cold-temperature performance. All parts support the full 175°C upper limit.

Q: How do reverse leakage currents compare across substitute options?

A: The STPSC406D specifies 50 µA reverse leakage at 600 V. The STPSC4H065D reduces this to 40 µA at 650 V. Wolfspeed parts specify 60 µA at 650 V. Infineon IDH04S60CAKSA1 matches the original at 50 µA at 600 V. Lower reverse leakage reduces standby power dissipation in high-impedance applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The STPSC406D, STPSC4H065D, all Wolfspeed C3D series, and all Infineon IDH series parts meet RoHS3 requirements, ensuring compatibility with environmental and regulatory standards.

Q: What is the significance of zero reverse recovery time in these diodes?

A: Zero reverse recovery time (trr = 0 ns) is a characteristic of SiC Schottky technology. This eliminates the charge storage phase present in silicon diodes, enabling faster switching transitions and reduced electromagnetic interference. All substitute parts maintain this zero recovery time specification.

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