25CTQ045 Equivalent & Substitute Parts

Part Overview

The 25CTQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in a TO-220-3 through-hole format and operates across a junction temperature range of -55°C to 150°C.

The 25CTQ045 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production builds and field replacements.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3

Substitute Part Grouping Explanation

Substitution of the 25CTQ045 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 15 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-3

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Within acceptable operating range
Operating Temperature - Junction: Must accommodate application requirements

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (15 A Rating): Parts with identical 15 A current rating and 45 V reverse voltage rating. These parts maintain the same electrical performance envelope as the 25CTQ045.

Category 2 - Higher Current Capability (30 A Rating): Parts with 30 A current rating and 45 V reverse voltage rating. These parts provide enhanced current handling capability and are electrically compatible for applications requiring the 25CTQ045 specification.

Parameter Comparison

Parameter	25CTQ045 (Vishay)	MBR2545CTG (onsemi)	MBR60L45CTG (onsemi)	STPS3045CT (STMicroelectronics)	STPS30L45CT (STMicroelectronics)
Diode Configuration	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
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	30 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	620 mV @ 15 A	550 mV @ 30 A	570 mV @ 15 A	550 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)
Current - Reverse Leakage @ Vr	1.75 mA @ 45 V	200 µA @ 45 V	1.2 mA @ 45 V	200 µA @ 45 V	400 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	Max 200°C	Max 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (15 A Current Rating):

The STPS30L45CT (STMicroelectronics) and STPS3045CT (STMicroelectronics) are direct electrical equivalents to the 25CTQ045. Both parts maintain the 15 A current rating and 45 V reverse voltage specification. The STPS3045CT offers the widest operating temperature range (up to 200°C maximum junction temperature) and is available in the highest inventory quantity (38,369 pieces). The STPS30L45CT provides a lower forward voltage drop (550 mV @ 15 A) compared to the 25CTQ045 (560 mV @ 15 A).

The MBR2545CTG (onsemi) is also a direct 15 A equivalent with extended operating temperature range (-65°C to 175°C). This part is available in high inventory (15,312 pieces) and carries ROHS3 compliance.

All four substitute parts are classified as Active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

For Enhanced Current Capability (30 A Current Rating):

The MBR60L45CTG (onsemi) provides 30 A average rectified current per diode while maintaining the 45 V reverse voltage rating. This part is suitable for applications where the 25CTQ045 specification can accommodate higher current capacity. The MBR60L45CTG features a forward voltage drop of 550 mV @ 30 A and operates across -65°C to 175°C. This part carries ROHS3 compliance and is available in active production status.

Compliance Considerations:

All substitute parts carry ROHS3 compliance certification. The 25CTQ045 is RoHS non-compliant. Selection of substitute parts ensures compliance with current environmental and regulatory standards. All substitute parts maintain REACH Unaffected status and EAR99 export classification, matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can the MBR60L45CTG (30 A rated) be used as a direct substitute for the 25CTQ045 (15 A rated)?

A: Yes. The MBR60L45CTG maintains the same 45 V reverse voltage rating, 1 Pair Common Cathode configuration, Schottky technology, and TO-220-3 package as the 25CTQ045. The higher 30 A current rating provides additional capability and does not prevent operation in circuits designed for 15 A. The part is electrically compatible with the 25CTQ045 specification.

Q: What is the difference between the STPS3045CT and STPS30L45CT?

A: Both parts are 15 A Schottky diode arrays rated for 45 V with TO-220-3 packaging. The STPS3045CT operates to a maximum junction temperature of 200°C, while the STPS30L45CT operates to a maximum of 150°C. The STPS30L45CT features a lower forward voltage drop (550 mV @ 15 A) compared to the STPS3045CT (570 mV @ 15 A). Both parts are Active products with ROHS3 compliance.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All substitute parts listed (MBR2545CTG, MBR60L45CTG, STPS3045CT, and STPS30L45CT) are packaged in TO-220-3 through-hole format, providing mechanical and thermal compatibility with the 25CTQ045 footprint.

Q: What is the significance of the forward voltage drop differences between substitute parts?

A: Forward voltage drop (Vf) affects power dissipation and thermal performance in the circuit. The 25CTQ045 specifies 560 mV @ 15 A. The STPS30L45CT and MBR60L45CTG both specify 550 mV @ 15 A, representing a 10 mV reduction. The STPS3045CT specifies 570 mV @ 15 A, representing a 10 mV increase. The MBR2545CTG specifies 620 mV @ 15 A, representing a 60 mV increase. These differences are within typical operating tolerances for Schottky diode arrays and do not prevent functional substitution.

Q: Why is the 25CTQ045 classified as obsolete?

A: The 25CTQ045 is no longer in active production by Vishay General Semiconductor. All substitute parts listed are classified as Active products with current manufacturing status, ensuring availability for new designs and field replacements.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All substitute parts (MBR2545CTG, MBR60L45CTG, STPS3045CT, and STPS30L45CT) carry ROHS3 compliance certification. The original 25CTQ045 is RoHS non-compliant. Selection of substitute parts ensures compliance with current environmental standards.

Q: What is the operating temperature range difference between the 25CTQ045 and substitute parts?

A: The 25CTQ045 operates from -55°C to 150°C junction temperature. The MBR2545CTG and MBR60L45CTG extend the lower operating limit to -65°C and the upper limit to 175°C. The STPS3045CT extends the upper limit to 200°C maximum junction temperature. The STPS30L45CT maintains the 150°C upper limit. These extended ranges provide additional design flexibility for temperature-sensitive applications.

Q: Are there inventory considerations for part selection?

A: Current inventory levels are: STPS3045CT (38,369 pieces), MBR2545CTG (15,312 pieces), MBR60L45CTG (2,949 pieces), and STPS30L45CT (5,404 pieces). The STPS3045CT offers the highest inventory availability for immediate procurement.

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