20CTQ150 Equivalent & Substitute Parts

Part Overview

The 20CTQ150 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as 1 pair common cathode with 150 V reverse voltage rating and 10 A average rectified current per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete product status. Identification of equivalent and substitute parts is necessary due to obsolescence and to support design flexibility with active product alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	150 V
Current - Average Rectified (Io) (per Diode)	10 A
Voltage - Forward (Vf) (Max) @ If	880 mV @ 10 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-55°C ~ 175°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 20CTQ150 are classified into two categories based on electrical parameter alignment:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Substitute parts that maintain the same voltage rating (150 V), current rating (10 A per diode), and forward voltage characteristics. These parts are direct functional replacements with identical electrical performance within the specified operating conditions.

Category 2: Manufacturer Recommended Substitutes (Variant Ratings) Substitute parts that share the same diode configuration, technology, and package but differ in current rating or voltage rating. These parts are suitable for applications where the design specifications allow for higher current capacity or voltage margin.

Key Parameters Determining Substitution:

Diode Configuration: 1 Pair Common Cathode (mandatory match)
Technology: Schottky (mandatory match)
Voltage - DC Reverse (Vr) (Max): 150 V minimum required
Current - Average Rectified (Io): 10 A minimum required
Package / Case: TO-220-3 (mandatory match)
Mounting Type: Through Hole (mandatory match)
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io) (mandatory match)

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Tj (Max)	Product Status	RoHS Status
20CTQ150	Vishay	150 V	10 A	880 mV @ 10 A	25 µA @ 150 V	175°C	Obsolete	Non-compliant
STPS20150CT	STMicroelectronics	150 V	10 A	920 mV @ 10 A	5 µA @ 150 V	175°C	Active	ROHS3 Compliant
DSA20C150PB	IXYS	150 V	10 A	880 mV @ 10 A	300 µA @ 150 V	175°C	Active	ROHS3 Compliant
STPS10150CT	STMicroelectronics	150 V	5 A	920 mV @ 5 A	2 µA @ 150 V	175°C	Active	ROHS3 Compliant
STPS20170CT	STMicroelectronics	170 V	10 A	900 mV @ 10 A	15 µA @ 170 V	175°C	Active	ROHS3 Compliant
STPS40150CT	STMicroelectronics	150 V	20 A	920 mV @ 20 A	8 µA @ 150 V	175°C	Active	ROHS3 Compliant
STPS40170CT	STMicroelectronics	170 V	20 A	920 mV @ 20 A	30 µA @ 170 V	175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: STPS20150CT The STPS20150CT from STMicroelectronics is the recommended primary substitute. This part maintains identical voltage (150 V) and current (10 A per diode) ratings as the 20CTQ150. The part is active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Forward voltage specification (920 mV @ 10 A) is within acceptable tolerance for Schottky diode technology. Reverse leakage current (5 µA @ 150 V) is superior to the original part, indicating improved device characteristics.

Secondary Substitute: DSA20C150PB The DSA20C150PB from IXYS provides parametric equivalence with identical voltage (150 V), current (10 A per diode), and forward voltage (880 mV @ 10 A) specifications. This part matches the original 20CTQ150 forward voltage characteristic precisely. Active product status and ROHS3 compliance support design continuity. Higher reverse leakage current (300 µA @ 150 V) compared to STPS20150CT should be evaluated for thermal management in high-temperature applications.

Higher Current Alternatives: STPS40150CT and STPS40170CT These parts provide increased current capacity (20 A per diode) while maintaining the 150 V or 170 V voltage rating. Selection is appropriate for designs requiring thermal margin or where current requirements may increase. Both parts are active with ROHS3 compliance.

Voltage-Elevated Alternative: STPS20170CT This part increases reverse voltage rating to 170 V while maintaining 10 A current capacity. Selection is appropriate for applications requiring higher voltage margin or where supply voltage specifications exceed 150 V.

Lower Current Alternative: STPS10150CT This part reduces current capacity to 5 A per diode while maintaining 150 V voltage rating. Selection is appropriate only for applications where maximum current requirement does not exceed 5 A per diode.

Frequently Asked Questions (FAQ)

Q: Can STPS10150CT be used as a direct replacement for 20CTQ150? A: STPS10150CT shares the same voltage rating (150 V), package (TO-220-3), and diode configuration. However, the current rating is reduced to 5 A per diode compared to the 10 A specification of 20CTQ150. This part is suitable only if the application current requirement does not exceed 5 A per diode.

Q: What is the difference between STPS20150CT and DSA20C150PB? A: Both parts maintain identical voltage (150 V) and current (10 A per diode) ratings. STPS20150CT has lower reverse leakage current (5 µA @ 150 V) compared to DSA20C150PB (300 µA @ 150 V). STPS20150CT is preferred for applications sensitive to leakage current or operating at elevated temperatures. DSA20C150PB matches the original forward voltage specification (880 mV @ 10 A) exactly.

Q: Are all substitute parts RoHS compliant? A: The original 20CTQ150 is RoHS non-compliant. All recommended substitute parts (STPS20150CT, DSA20C150PB, STPS10150CT, STPS20170CT, STPS40150CT, STPS40170CT) are ROHS3 compliant, supporting regulatory requirements for new designs.

Q: Can STPS40150CT replace 20CTQ150 in existing designs? A: STPS40150CT maintains the same voltage rating (150 V) and package (TO-220-3). The increased current rating (20 A per diode versus 10 A) provides thermal margin and is electrically compatible. Pin configuration and diode array topology are identical. This part is suitable for direct replacement with the benefit of higher current capacity.

Q: What is the significance of forward voltage differences between substitutes? A: Forward voltage (Vf) varies between 880 mV and 920 mV at 10 A across the substitute parts. This 40 mV variation is typical for Schottky diode technology and represents approximately 4.5% difference. Circuit designs with voltage regulation or feedback control accommodate this variation. Applications with tight voltage budgets should evaluate the specific forward voltage of the selected substitute.

Q: Why does DSA20C150PB have higher reverse leakage current than STPS20150CT? A: Reverse leakage current (Ir) is a device characteristic that varies by manufacturer process technology and die design. DSA20C150PB specifies 300 µA @ 150 V while STPS20150CT specifies 5 µA @ 150 V. Both values are within acceptable ranges for Schottky diodes. Higher leakage current increases power dissipation at maximum reverse voltage; this is relevant for high-temperature or high-voltage applications.

Q: Is the TO-220-3 package identical across all substitute parts? A: All substitute parts use TO-220-3 through-hole package. Pin configuration and mechanical dimensions are standardized for this package type, ensuring mechanical and electrical compatibility in PCB layouts designed for TO-220-3 devices.

Q: Can STPS20170CT be used where 150 V rating is specified? A: STPS20170CT has a 170 V reverse voltage rating, which exceeds the 150 V specification of 20CTQ150. This part is electrically compatible and provides voltage margin. Selection is appropriate for applications where higher voltage rating provides design flexibility or where supply voltage specifications may vary.

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