DSA70C100HB Equivalent & Substitute Parts

Part Overview

The DSA70C100HB is an IXYS Schottky diode array featuring a 1 Pair Common Cathode configuration rated for 100 V DC reverse voltage and 35 A average rectified current per diode. This component is packaged in TO-247-3 through-hole format and is currently in active product status. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary component reaches end-of-life status, inventory constraints occur, or design requirements allow for alternative current ratings within the same voltage class and package family. The substitute parts listed maintain electrical compatibility through matching voltage ratings, diode configuration, technology type, and mounting methodology.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io) (per Diode)	35	A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 35 A	mV
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Operating Temperature - Junction	-55°C ~ 175°C	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the DSA70C100HB is determined by the following mandatory parameters:

Voltage Compatibility: All substitute parts must maintain a maximum DC reverse voltage (Vr) rating of 100 V to ensure circuit protection and reliability.

Diode Configuration: All substitutes must feature a 1 Pair Common Cathode configuration to maintain pinout and functional equivalence.

Technology Type: All substitutes must utilize Schottky diode technology to preserve switching characteristics and forward voltage performance.

Mounting and Package: All substitutes must be through-hole mounted components in TO-247-3 package format to ensure mechanical and electrical compatibility with existing PCB designs.

Speed Characteristic: All substitutes must meet the Fast Recovery specification (≤ 500ns, > 200mA) to maintain switching performance.

Current rating variations are permitted within the substitute group, as applications may tolerate lower current ratings with appropriate thermal and circuit design considerations. However, current ratings below the application requirement are not suitable substitutes.

Parameter Comparison

Parameter	DSA70C100HB (Main)	FST30100	FST50100	MBR40H100WTG	STPS30H100CW	STPS40H100CW	STPS61H100CW
Manufacturer	IXYS	Microsemi Corporation	Microsemi Corporation	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io) (per Diode)	35 A	15 A	25 A	20 A	15 A	20 A	30 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 35 A	850 mV @ 15 A	850 mV @ 25 A	800 mV @ 20 A	800 mV @ 15 A	730 mV @ 20 A	790 mV @ 30 A
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Operating Temperature - Junction (Min)	-55°C	-55°C	-55°C	Not specified	-40°C	Not specified	Not specified
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C	175°C	175°C	175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-3P-3 Full Pack	TO-3P-3 Full Pack	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Active	Obsolete	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Active Product Status Substitutes: STPS30H100CW, STPS40H100CW, and STPS61H100CW are all currently in active product status from STMicroelectronics. These parts are recommended for new designs and long-term availability assurance. STPS61H100CW provides the closest current rating match at 30 A, while STPS40H100CW offers 20 A and STPS30H100CW provides 15 A ratings.

Compliance Considerations: All active substitute parts maintain ROHS3 compliance. FST50100 is noted as RoHS non-compliant and should be avoided in applications requiring regulatory compliance. FST30100 and FST50100 are both marked as obsolete and present long-term supply risk.

Package Compatibility: FST30100 and FST50100 utilize TO-3P-3 Full Pack packaging, which differs from the TO-247-3 standard package of the main part and other active substitutes. This packaging difference may require PCB layout modifications and is not recommended for direct replacement without design verification.

Current Rating Selection: Applications requiring the full 35 A capability of the DSA70C100HB cannot be directly substituted with lower-rated parts. For applications with reduced current requirements, STPS61H100CW (30 A) provides the highest available rating among active substitutes. STPS40H100CW (20 A) and STPS30H100CW (15 A) are suitable only for circuits designed for their respective current levels.

Frequently Asked Questions (FAQ)

Q: Can STPS30H100CW or STPS40H100CW be used as direct replacements for DSA70C100HB in a 35 A application?

A: No. STPS30H100CW is rated for 15 A and STPS40H100CW is rated for 20 A per diode. These parts cannot safely handle the 35 A current requirement of the original design. STPS61H100CW, rated at 30 A, approaches but does not meet the full 35 A specification. Substitution is only valid for applications designed for the lower current ratings.

Q: What is the difference between TO-247-3 and TO-3P-3 Full Pack packaging?

A: TO-247-3 and TO-3P-3 Full Pack are distinct package formats with different mechanical dimensions and pin configurations. FST30100 and FST50100 use TO-3P-3 Full Pack, while the DSA70C100HB and active STMicroelectronics substitutes use TO-247-3. These packages are not mechanically interchangeable without PCB redesign.

Q: Why are FST30100 and FST50100 listed as obsolete?

A: Obsolete product status indicates that these parts are no longer in active production and may have limited availability. Microsemi Corporation has discontinued these product lines. For new designs and long-term supply assurance, active products such as the STMicroelectronics STPS series are preferred.

Q: Are all substitute parts RoHS3 compliant?

A: No. FST50100 is marked as RoHS non-compliant. All other substitutes, including FST30100, MBR40H100WTG, and the STMicroelectronics STPS series parts, are ROHS3 compliant. Applications requiring regulatory compliance must exclude FST50100.

Q: What is the forward voltage difference between the main part and substitutes?

A: The DSA70C100HB exhibits 920 mV forward voltage at 35 A. Substitute parts show lower forward voltages at their respective current ratings: STPS40H100CW shows 730 mV at 20 A, and STPS61H100CW shows 790 mV at 30 A. Forward voltage variations affect power dissipation and thermal performance in the circuit.

Q: Can MBR40H100WTG be used as a substitute despite its obsolete status?

A: MBR40H100WTG is obsolete but maintains TO-247-3 package compatibility, ROHS3 compliance, and 100 V voltage rating. However, its 20 A current rating is insufficient for 35 A applications. Obsolete status also presents supply chain risk. Active alternatives from STMicroelectronics are preferred.

Q: What are the minimum operating temperature differences between parts?

A: The DSA70C100HB operates from -55°C minimum junction temperature. STPS30H100CW operates from -40°C minimum, representing a 15°C difference. FST30100 and FST50100 match the -55°C minimum. For applications requiring full -55°C to 175°C range, STPS30H100CW may not be suitable.

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