Equivalent & Substitute Parts for 25CTQ035 Schottky Diode Array

Part Overview

The 25CTQ035 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 35 V DC reverse voltage and 15 A average rectified current per diode. This component is packaged in TO-220-3 through-hole configuration and features fast recovery characteristics suitable for switching applications.

The 25CTQ035 is classified as obsolete, necessitating identification of equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching or exceeding electrical specifications while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1.75	mA @ 35 V
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 25CTQ035 is determined by the following critical parameters:

Mandatory Matching Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 35 V minimum
Current - Average Rectified (Io) (per Diode): 15 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-3

Allowable Parameter Variations:

Forward Voltage (Vf): Substitute parts may exceed the 560 mV specification
Reverse Leakage Current: Substitute parts may be lower than 1.75 mA
Operating Temperature Range: Substitute parts may exceed the -55°C to 175°C range
Product Status: Active status preferred over obsolete

Substitute parts are classified into two categories: MFR Recommended (manufacturer-endorsed alternatives) and Parametric Equivalent (parts meeting all electrical and mechanical requirements).

Parameter Comparison

Parameter	25CTQ035 (Vishay)	MBR2535CTG (onsemi)	STPS3045CT (STMicroelectronics)	25CTQ035 (SMC Diode Solutions)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	45 V	35 V
Current - Average Rectified (Io) (per Diode)	15 A	30 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	820 mV @ 30 A	570 mV @ 15 A	560 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1.75 mA @ 35 V	200 µA @ 35 V	200 µA @ 45 V	1 mA @ 35 V
Operating Temperature - Junction	-55 to 175°C	-65 to 175°C	Max 200°C	-55 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MBR2535CTG (onsemi SWITCHMODE™ Series)

The MBR2535CTG is an MFR Recommended substitute offering 30 A current capacity, exceeding the 15 A requirement of the 25CTQ035. This part maintains 35 V reverse voltage rating and TO-220-3 packaging. The MBR2535CTG is Active status and ROHS3 compliant, addressing obsolescence and regulatory requirements. Forward voltage is specified at 820 mV @ 30 A, which is higher than the original 560 mV @ 15 A specification due to the increased current rating. Reverse leakage current is reduced to 200 µA @ 35 V. Operating temperature range extends to -65°C to 175°C. This part is suitable for applications requiring higher current capacity or improved compliance posture.

STPS3045CT (STMicroelectronics)

The STPS3045CT is an MFR Recommended substitute with elevated reverse voltage rating of 45 V, providing additional voltage margin beyond the 35 V specification. Current rating matches the original at 15 A. Forward voltage is 570 mV @ 15 A, closely aligned with the original specification. Reverse leakage current is 200 µA @ 45 V. Maximum junction temperature is 200°C. The STPS3045CT is Active status and ROHS3 compliant. This part is suitable for applications where higher voltage headroom is beneficial or where design margins require elevated voltage ratings.

25CTQ035 (SMC Diode Solutions)

The SMC Diode Solutions 25CTQ035 is a Parametric Equivalent offering identical electrical specifications to the original Vishay part: 35 V reverse voltage, 15 A current, and 560 mV forward voltage @ 15 A. This part is Active status and ROHS3 compliant, eliminating obsolescence concerns. Reverse leakage current is 1 mA @ 35 V, lower than the original 1.75 mA. Operating temperature range is -55°C to 150°C, slightly reduced from the original -55°C to 175°C. This part provides direct functional equivalence with improved compliance and availability.

Frequently Asked Questions (FAQ)

Q: Can the MBR2535CTG replace the 25CTQ035 in all applications?

A: The MBR2535CTG meets all mandatory substitution criteria with matching 35 V reverse voltage and TO-220-3 packaging. The 30 A current rating exceeds the 15 A requirement, providing design margin. However, the forward voltage specification of 820 mV @ 30 A differs from the original 560 mV @ 15 A. Applications sensitive to forward voltage drop or thermal dissipation must evaluate this parameter against circuit requirements.

Q: What is the difference between the STPS3045CT and the original 25CTQ035?

A: The STPS3045CT maintains the 15 A current rating and closely matches the 560 mV forward voltage specification at 570 mV @ 15 A. The primary difference is the elevated 45 V reverse voltage rating compared to the original 35 V. This provides additional voltage margin and is suitable for applications where higher voltage headroom is required or beneficial for design robustness.

Q: Is the SMC Diode Solutions 25CTQ035 a direct replacement?

A: The SMC Diode Solutions 25CTQ035 provides parametric equivalence with identical 35 V reverse voltage, 15 A current, and 560 mV forward voltage specifications. The part is Active status and ROHS3 compliant. The operating temperature range is -55°C to 150°C, which is 25°C lower than the original Vishay specification. Applications operating near the upper temperature limit must verify compatibility.

Q: Why do substitute parts have different reverse leakage current specifications?

A: Reverse leakage current is a manufacturing parameter that varies by process technology and device design. The MBR2535CTG and STPS3045CT specify 200 µA @ rated voltage, lower than the original 1.75 mA. Lower reverse leakage current is generally beneficial for circuit performance and does not prevent substitution.

Q: Are all substitute parts RoHS compliant?

A: The original 25CTQ035 from Vishay is RoHS non-compliant. All three substitute parts (MBR2535CTG, STPS3045CT, and SMC Diode Solutions 25CTQ035) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: Can I use the STPS3045CT in a circuit designed for 35 V operation?

A: Yes. The STPS3045CT is rated for 45 V reverse voltage, which exceeds the 35 V circuit requirement. The part operates safely at 35 V with additional voltage margin. This configuration is suitable for applications where elevated voltage ratings provide design robustness.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts are packaged in TO-220-3 through-hole configuration, matching the original 25CTQ035. Physical dimensions and pin assignments are compatible. The MBR2535CTG is supplied in Tube packaging, while STPS3045CT and SMC Diode Solutions 25CTQ035 are supplied in Tube packaging. Packaging format does not affect electrical or mechanical compatibility.

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