DSEC30-03A Equivalent & Substitute Parts

Part Overview

The DSEC30-03A is a diode array rectifier manufactured by IXYS, configured as a 1 Pair Common Cathode design rated for 300 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in a TO-247-3 through-hole format and belongs to the HiPerFRED™ series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The fast recovery characteristic (≤500 ns) and 30 ns reverse recovery time position this component for applications requiring rapid switching performance in rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	1.67 V @ 15 A	V
Reverse Recovery Time (trr)	30	ns
Speed Classification	Fast Recovery ≤500ns, >200mA (Io)	—
Diode Configuration	1 Pair Common Cathode	—
Package / Case	TO-247-3	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 175	°C

Substitute Part Grouping Explanation

Substitution eligibility for the DSEC30-03A is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V
Diode Configuration: 1 Pair Common Cathode
Package / Case: TO-247-3
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤500ns, >200mA (Io)

Secondary Compatibility Factors:

Current - Average Rectified (Io) (per Diode): Equal or greater rating
Reverse Recovery Time (trr): Lower or equal values preferred for performance equivalence
Forward Voltage (Vf): Lower values indicate improved efficiency
Operating Temperature Range: Minimum -55°C to maximum 175°C

Substitute parts are grouped into two categories: Direct Equivalents (matching 15 A current rating) and Uprated Alternatives (higher current ratings with identical voltage and package specifications). All substitute parts maintain the 300 V reverse voltage rating, common cathode configuration, and TO-247-3 package format required for mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status
DSEC30-03A	IXYS	300	15	1.67 @ 15 A	30	100 @ 300 V	175	Obsolete
DPG30C300HB	IXYS	300	15	1.25 @ 15 A	35	1 @ 300 V	175	Active
STTH3003CW	STMicroelectronics	300	15	1.25 @ 15 A	40	40 @ 300 V	175	Active
STTH30R03CW	STMicroelectronics	300	15	1.9 @ 15 A	35	20 @ 300 V	175	Active
STTH50W03CW	STMicroelectronics	300	25	1.5 @ 25 A	27	15 @ 300 V	175	Active
STTH6003CW	STMicroelectronics	300	30	1.25 @ 30 A	55	60 @ 300 V	175	Active
STTH8003CY	STMicroelectronics	300	40	1.25 @ 40 A	60	80 @ 300 V	175	Obsolete

Engineering Selection Recommendations

Direct Equivalent Substitutes (15 A Rating):

The DPG30C300HB (IXYS) and STTH3003CW (STMicroelectronics) are direct functional equivalents to the DSEC30-03A. Both maintain the 15 A current rating, 300 V reverse voltage, and TO-247-3 package. The DPG30C300HB offers superior performance with lower forward voltage (1.25 V vs. 1.67 V) and reduced reverse leakage current (1 µA vs. 100 µA), while maintaining active product status and RoHS3 compliance. The STTH3003CW provides equivalent performance with slightly higher reverse recovery time (40 ns vs. 30 ns) and moderate reverse leakage (40 µA). Both are suitable for direct replacement in existing designs.

Uprated Alternatives (Higher Current Ratings):

The STTH50W03CW (25 A) and STTH6003CW (30 A) provide increased current capacity while maintaining 300 V reverse voltage and TO-247-3 packaging. These parts are applicable when circuit redesign permits higher current handling or when thermal management improvements are desired. The STTH50W03CW demonstrates superior reverse recovery time (27 ns) compared to the original part. The STTH6003CW offers the highest current rating (30 A) with active product status.

Compliance and Availability:

All active substitute parts carry RoHS3 compliance and REACH Unaffected status. The STTH8003CY, while listed as an equivalent, is classified as obsolete and should not be selected for new designs despite its availability. Selection should prioritize active-status parts (DPG30C300HB, STTH3003CW, STTH50W03CW, STTH6003CW) to ensure long-term supply chain continuity and compliance with current environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the DPG30C300HB directly replace the DSEC30-03A without circuit modification?

A: Yes. The DPG30C300HB is a direct equivalent with identical voltage rating (300 V), current rating (15 A), diode configuration (1 Pair Common Cathode), and package format (TO-247-3). The lower forward voltage (1.25 V vs. 1.67 V) and reduced reverse leakage current represent performance improvements that do not require circuit changes.

Q: What is the difference between the STTH3003CW and STTH30R03CW?

A: Both parts share the same 15 A current rating, 300 V reverse voltage, and TO-247-3 package. The primary difference is forward voltage: STTH3003CW operates at 1.25 V @ 15 A, while STTH30R03CW operates at 1.9 V @ 15 A. The STTH3003CW is preferred for applications where lower power dissipation is critical. Reverse recovery time differs slightly (40 ns vs. 35 ns), with STTH30R03CW offering marginally faster recovery.

Q: Can I use the STTH50W03CW (25 A) or STTH6003CW (30 A) as substitutes for the 15 A DSEC30-03A?

A: Yes, uprated parts are electrically compatible substitutes. The higher current ratings provide design margin and improved thermal performance. However, circuit board layout and thermal management may require evaluation to ensure the higher current capability does not introduce unintended operational changes. The 300 V reverse voltage and TO-247-3 package remain identical.

Q: Why is the STTH8003CY listed as a substitute if it is obsolete?

A: The STTH8003CY is included in the substitute list based on the provided input data but is classified as obsolete. For new designs and ongoing procurement, active-status alternatives (DPG30C300HB, STTH3003CW, STTH50W03CW, STTH6003CW) are recommended to ensure supply chain reliability and compliance with current standards.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration indicates the diode array contains two diodes with a shared cathode terminal. The common cathode connection reduces the pin count and simplifies PCB layout compared to independent diodes. All listed substitutes maintain this configuration, ensuring mechanical and electrical compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts (DPG30C300HB, STTH3003CW, STTH30R03CW, STTH50W03CW, STTH6003CW) carry RoHS3 compliance certification. The obsolete STTH8003CY also carries RoHS3 compliance. This ensures compatibility with current environmental regulations and procurement standards.

Q: How does reverse recovery time (trr) affect circuit performance?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking. Lower trr values reduce switching losses and electromagnetic interference. The DSEC30-03A specifies 30 ns trr. Substitute parts range from 27 ns (STTH50W03CW) to 60 ns (STTH8003CY). Parts with equal or lower trr values maintain or improve switching performance.

Q: What is the significance of reverse leakage current (Ir)?

A: Reverse leakage current is the small current flowing through a reverse-biased diode. Lower values indicate better blocking characteristics and reduced power dissipation in standby conditions. The DSEC30-03A specifies 100 µA @ 300 V. The DPG30C300HB offers significantly lower leakage (1 µA), improving efficiency in applications with extended reverse-bias periods.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message