STPS30L45CT Equivalent & Substitute Parts

Part Overview

The STPS30L45CT is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 15 A per diode. The device is packaged in TO-220-3 through-hole format and is currently in active product status with ROHS3 compliance. Equivalent and substitute parts are necessary to address supply chain requirements, alternative packaging needs, or specific application constraints while maintaining electrical and mechanical compatibility within defined parameter ranges.

Key Parameters

Parameter	Value	Unit
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	550 mV @ 15 A	-
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	400	µA @ 45 V
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Through Hole	-
Package / Case	TO-220-3	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the STPS30L45CT is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: 550 mV @ 15 A (reference baseline)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (reference baseline)
Current - Reverse Leakage @ Vr: 400 µA @ 45 V (reference baseline)
Operating Temperature - Junction: 150°C (Max) (reference baseline)

Substitute parts are classified into the following categories:

Parametric Equivalent: Identical electrical specifications with alternative packaging (TO-247-3).

Direct Manufacturer Equivalent: Identical or near-identical electrical specifications from alternative manufacturers in the same package format.

Similar Parts: Parts meeting core electrical criteria (45 V, 15 A, Schottky, common cathode) with acceptable parameter variations or alternative package options.

Parts that deviate from mandatory criteria (such as MBR3045CT with 30 mA current rating or ST30150C with 150 V rating) are listed for reference but do not qualify as direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package	Product Status	RoHS Status
STPS30L45CT	STMicroelectronics	45 V	15 A	550 mV @ 15 A	TO-220-3	Active	ROHS3 Compliant
STPS30L45CW	STMicroelectronics	45 V	15 A	550 mV @ 15 A	TO-247-3	Active	ROHS3 Compliant
25CTQ045	Vishay General Semiconductor - Diodes Division	45 V	15 A	560 mV @ 15 A	TO-220-3	Obsolete	RoHS non-compliant
MBR3045CTP	Diodes Incorporated	45 V	15 A	650 mV @ 15 A	TO-220-3 Isolated Tab	Obsolete	ROHS3 Compliant
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	TO-220-3	Active	ROHS3 Compliant
MBR60L45CTG	onsemi	45 V	30 A	550 mV @ 30 A	TO-220-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Substitutes (Active Status, ROHS3 Compliant):

STPS30L45CW (STMicroelectronics): Identical electrical specifications to the STPS30L45CT with alternative TO-247-3 packaging. Suitable for applications requiring higher thermal dissipation or different PCB layout constraints. Same manufacturer ensures design continuity and documentation compatibility.
MBR2545CTG (onsemi): Meets all mandatory electrical criteria with 45 V reverse voltage and 15 A average rectified current in TO-220-3 package. Forward voltage of 620 mV at 15 A represents a 70 mV increase over the STPS30L45CT baseline. Active product status and ROHS3 compliance ensure long-term availability and regulatory compliance.

Alternative Substitutes (Specific Application Scenarios):

MBR60L45CTG (onsemi): Provides 30 A average rectified current per diode while maintaining 45 V reverse voltage and TO-220-3 packaging. Suitable for applications requiring higher current capacity than the 15 A specification. Forward voltage of 550 mV at 30 A matches the STPS30L45CT baseline at its rated current. Active product status and ROHS3 compliance confirmed.

Obsolete Parts (Not Recommended for New Designs):

25CTQ045 (Vishay): Obsolete product status and RoHS non-compliance disqualify this part for new applications despite matching electrical specifications.
MBR3045CTP (Diodes Incorporated): Obsolete product status limits availability and support, despite ROHS3 compliance and isolated tab packaging option.

Frequently Asked Questions (FAQ)

Q: Can STPS30L45CW replace STPS30L45CT in existing designs?

A: STPS30L45CW is electrically equivalent with identical voltage, current, and forward voltage specifications. The primary difference is packaging: TO-247-3 versus TO-220-3. PCB layout and thermal management design must accommodate the different pin configuration and larger package footprint of TO-247-3. Mechanical verification is required before implementation.

Q: What is the difference between STPS30L45CT and MBR2545CTG?

A: Both parts meet the mandatory criteria of 45 V reverse voltage, 15 A average rectified current, Schottky technology, and TO-220-3 packaging. The forward voltage differs: STPS30L45CT specifies 550 mV at 15 A, while MBR2545CTG specifies 620 mV at 15 A. This 70 mV difference may affect power dissipation in high-current applications. MBR2545CTG is from onsemi's SWITCHMODE™ series and is currently active.

Q: Is MBR60L45CTG a suitable substitute for STPS30L45CT?

A: MBR60L45CTG maintains the 45 V reverse voltage and TO-220-3 package but provides 30 A average rectified current per diode, double the STPS30L45CT specification. This part is suitable only for applications requiring higher current capacity. It is not a direct substitute for 15 A designs but may be used in designs where current headroom is beneficial. Forward voltage at 30 A is 550 mV, matching the STPS30L45CT baseline.

Q: Why are 25CTQ045 and MBR3045CTP listed if they are obsolete?

A: Obsolete parts are included for reference in legacy system maintenance and repair scenarios. These parts meet the electrical specifications but are not recommended for new designs due to discontinued product status and potential supply chain unavailability. 25CTQ045 additionally carries RoHS non-compliance, which may violate regulatory requirements in certain markets.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration indicates the diode array contains two diodes with a shared cathode terminal. The common cathode connection is critical for circuit functionality. All listed substitute parts maintain this configuration, ensuring pin-compatible operation in applications designed for common cathode topology.

Q: Are there current rating differences between substitute parts?

A: Yes. STPS30L45CT and most substitutes are rated for 15 A average rectified current per diode. MBR60L45CTG is rated for 30 A, providing higher current capacity. MBR3045CT is rated for 30 mA and does not qualify as a substitute for 15 A applications. Current rating selection must match application requirements.

Q: What compliance certifications should I verify for new designs?

A: ROHS3 compliance is confirmed for STPS30L45CT, STPS30L45CW, MBR3045CTP, MBR2545CTG, and MBR60L45CTG. All listed parts carry REACH Unaffected or REACH Affected status. Verify REACH compliance status with your supplier if operating in regulated markets. RoHS non-compliant parts (25CTQ045) should not be used in new designs subject to RoHS regulations.

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