47CTQ020 Equivalent & Substitute Parts

Part Overview

The 47CTQ020 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 20 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 case suitable for high-current rectification applications.

The 47CTQ020 is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io) (per Diode)	20 A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	3 mA @ 20 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 47CTQ020 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Diode Configuration: 1 Pair Common Cathode (electrical topology must match)
Technology: Schottky (switching characteristics and forward voltage behavior)
Mounting Type: Through Hole (mechanical installation compatibility)
Package / Case: TO-220-3 (physical form factor and pin assignment)

Functional Performance Criteria:

Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 20 V
Current - Average Rectified (Io) (per Diode): Substitute must equal or exceed 20 A
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io) (transient response requirement)

The STPS2045CT meets the mandatory compatibility criteria and exceeds the functional performance requirements, making it a valid substitute for the 47CTQ020.

Parameter Comparison

Parameter	47CTQ020 (Main Part)	STPS2045CT (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	10 A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 20 A	570 mV @ 10 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	3 mA @ 20 V	100 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	175°C (Max)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Product Status Consideration: The 47CTQ020 is classified as Obsolete, while the STPS2045CT is Active. Selection of an active product ensures ongoing availability, manufacturing support, and compliance with current industry standards.

Compliance and Certification: The STPS2045CT is ROHS3 Compliant and REACH Unaffected, whereas the 47CTQ020 is RoHS non-compliant. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, the STPS2045CT provides the necessary certification status.

Electrical Performance: The STPS2045CT provides higher reverse voltage rating (45 V versus 20 V), offering enhanced overvoltage margin. However, the average rectified current per diode is reduced to 10 A compared to the 47CTQ020's 20 A rating. Circuit design must account for this current limitation when selecting the STPS2045CT as a substitute.

Thermal Performance: The STPS2045CT supports a maximum junction temperature of 175°C, compared to the 47CTQ020's upper limit of 150°C, providing improved thermal headroom in high-temperature operating environments.

Frequently Asked Questions (FAQ)

Q: Can the STPS2045CT directly replace the 47CTQ020 in all applications?

A: The STPS2045CT is electrically and mechanically compatible with the 47CTQ020 due to matching diode configuration, Schottky technology, fast recovery speed, and TO-220-3 package. However, the reduced current rating (10 A per diode versus 20 A) requires circuit verification to ensure the application does not exceed this limit.

Q: What is the significance of the higher reverse voltage rating on the STPS2045CT?

A: The STPS2045CT's 45 V reverse voltage rating exceeds the 47CTQ020's 20 V rating. This provides additional safety margin against transient overvoltages and reverse voltage spikes, reducing the risk of component failure in applications with voltage fluctuations.

Q: Are there any thermal considerations when substituting the STPS2045CT for the 47CTQ020?

A: The STPS2045CT supports a maximum junction temperature of 175°C compared to the 47CTQ020's 150°C limit. This allows operation in higher ambient temperature environments. However, the reduced current rating may result in lower power dissipation, potentially improving thermal performance in current-limited applications.

Q: Does the STPS2045CT meet modern regulatory requirements?

A: Yes. The STPS2045CT is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards. The 47CTQ020 is RoHS non-compliant, making the STPS2045CT the appropriate choice for applications requiring regulatory compliance.

Q: What is the impact of the forward voltage difference between these parts?

A: The STPS2045CT exhibits a forward voltage of 570 mV @ 10 A, compared to the 47CTQ020's 450 mV @ 20 A. This difference reflects the different current ratings and measurement conditions. Circuit designs must account for this forward voltage characteristic when calculating power dissipation and voltage drop across the diode array.

Q: Is the TO-220-3 package identical between both parts?

A: Both the 47CTQ020 and STPS2045CT use the TO-220-3 Through Hole package, ensuring mechanical and pin-level compatibility. No PCB layout modifications are required for physical substitution.

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