Equivalent & Substitute Parts for 30CTQ035S

Part Overview

The 30CTQ035S is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as 1 pair common cathode with 35V reverse voltage rating and 15A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount configuration. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity.

Key Parameters

Parameter	Value
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	620 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 35 V
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 30CTQ035S are classified into two categories based on electrical parameter compatibility:

Parametric Equivalents (Vishay 30CTQ035 Series): Parts VS-30CTQ035STRL-M3, VS-30CTQ035STRLHM3, VS-30CTQ035STRR-M3, and VS-30CTQ035STRRHM3 maintain identical electrical specifications across all critical parameters: 35V reverse voltage, 15A average rectified current, 620mV forward voltage drop at 15A, and -55°C to 175°C junction temperature range. These parts differ only in packaging format (Tape & Reel variants) and compliance status (RoHS3 compliant, active product status). The automotive-grade variants (STRLHM3 and STRRHM3) include AEC-Q101 qualification.

Manufacturer-Recommended Alternatives (STMicroelectronics STPS Series): Parts STPS3030CG-TR and STPS3045CG-TR provide functional substitution with voltage rating variations. The STPS3030CG-TR operates at 30V maximum reverse voltage (5V lower than the original), while STPS3045CG-TR operates at 45V maximum reverse voltage (10V higher than the original). Both maintain the 15A current rating and fast recovery Schottky technology. These alternatives are suitable for applications where the voltage margin permits operation outside the original 35V specification.

Parameter Comparison

Parameter	30CTQ035S	VS-30CTQ035STRL-M3	VS-30CTQ035STRLHM3	VS-30CTQ035STRR-M3	VS-30CTQ035STRRHM3	STPS3030CG-TR	STPS3045CG-TR
Manufacturer	Vishay	Vishay	Vishay	Vishay	Vishay	STMicroelectronics	STMicroelectronics
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
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	35 V	35 V	35 V	30 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	15 A	15 A	15 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	620 mV @ 15 A	620 mV @ 15 A	620 mV @ 15 A	620 mV @ 15 A	620 mV @ 15 A	490 mV @ 15 A	570 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 35 V	2 mA @ 35 V	2 mA @ 35 V	2 mA @ 35 V	2 mA @ 35 V	1 mA @ 30 V	200 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	150°C (Max)	200°C (Max)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	Yes (AEC-Q101)	No	Yes (AEC-Q101)	No	No

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select from the Vishay 30CTQ035 series parametric equivalents (VS-30CTQ035STRL-M3, VS-30CTQ035STRLHM3, VS-30CTQ035STRR-M3, or VS-30CTQ035STRRHM3) when exact electrical specifications must be maintained. These parts provide complete functional equivalence with the obsolete 30CTQ035S while offering active product status and RoHS3 compliance. The choice between standard and automotive-grade variants depends on application requirements. Automotive-grade parts (STRLHM3 and STRRHM3) include AEC-Q101 qualification for automotive applications.

For Voltage-Rated Alternatives:

The STPS3030CG-TR from STMicroelectronics is suitable for applications where the 35V specification provides design margin and operation at 30V maximum reverse voltage is acceptable. This part offers lower forward voltage drop (490mV vs. 620mV at 15A), reducing power dissipation.

The STPS3045CG-TR from STMicroelectronics is suitable for applications requiring higher voltage margin or operating at voltages exceeding 35V up to 45V. This part provides extended temperature capability (200°C maximum junction temperature) and lower reverse leakage current (200µA at 45V).

All substitute parts maintain identical package geometry (TO-263-3, D2PAK), diode configuration (1 pair common cathode), current rating (15A), and fast recovery Schottky technology, ensuring mechanical and functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can VS-30CTQ035STRL-M3 be used as a direct replacement for 30CTQ035S?

A: Yes. The VS-30CTQ035STRL-M3 maintains identical electrical specifications: 35V reverse voltage, 15A average rectified current, 620mV forward voltage drop at 15A, and -55°C to 175°C junction temperature range. The primary differences are packaging format (Tape & Reel) and compliance status (RoHS3 compliant, active product). Mechanical compatibility is confirmed through identical TO-263-3 D2PAK package geometry.

Q: What is the difference between automotive-grade variants (STRLHM3, STRRHM3) and standard variants?

A: Automotive-grade variants include AEC-Q101 qualification, indicating compliance with automotive industry reliability and quality standards. These parts are suitable for automotive applications requiring formal qualification documentation. Standard variants lack this qualification but maintain identical electrical performance and package compatibility.

Q: When should STPS3030CG-TR be selected over the Vishay 30CTQ035 equivalents?

A: The STPS3030CG-TR is selected when the application operates at voltages not exceeding 30V and lower forward voltage drop is beneficial for thermal management. The 30V rating provides adequate margin for applications designed for 30V operation. The reduced forward voltage (490mV vs. 620mV at 15A) results in lower power dissipation and heat generation.

Q: When should STPS3045CG-TR be selected over the Vishay 30CTQ035 equivalents?

A: The STPS3045CG-TR is selected for applications requiring operation above 35V up to 45V maximum reverse voltage, or when extended temperature capability (200°C maximum junction temperature) is required. The higher voltage rating provides design margin for applications with voltage transients or higher nominal operating voltages.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are packaged in TO-263-3 D2PAK (2 Leads + Tab) surface mount configuration, ensuring identical mechanical compatibility and PCB layout requirements. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) do not affect component dimensions or mounting characteristics.

Q: What is the impact of RoHS compliance on part selection?

A: The 30CTQ035S is RoHS non-compliant, while all substitute parts are RoHS3 compliant. For new designs and production environments subject to RoHS regulations, selection of RoHS3 compliant substitutes is mandatory. Existing designs using the obsolete 30CTQ035S must transition to compliant alternatives for continued production.

Q: Can the Vishay 30CTQ035 series parts be interchanged with each other?

A: Yes. All Vishay 30CTQ035 series parts (STRL-M3, STRLHM3, STRR-M3, STRRHM3) are electrically and mechanically interchangeable. Differences exist only in packaging format (Tape & Reel variants) and automotive qualification status. Selection depends on supply chain requirements and application-specific certifications.

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