STPS4045CT Equivalent & Substitute Parts

Part Overview

The STPS4045CT is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with 45 V reverse voltage rating and 20 A average rectified current per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Alternative components maintain the core electrical specifications while offering improved availability and, in some cases, enhanced performance characteristics.

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)	20	A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction (Max)	175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STPS4045CT is determined by the following critical parameters: diode configuration (1 pair common cathode), technology type (Schottky), reverse voltage rating (45 V), average rectified current (20 A per diode), and through-hole mounting in TO-220 package family. Parts are grouped into three categories based on electrical and mechanical compatibility:

Parametric Equivalents (Identical Electrical Specifications): Parts that maintain all key electrical parameters including 45 V reverse voltage, 20 A current rating, 760 mV forward voltage at 20 A, and fast recovery speed. These parts differ only in package variant (TO-247-3) or product status (active vs. obsolete).

Direct Manufacturer Alternatives (Same Package, Similar Electrical Performance): Parts from alternative manufacturers that maintain TO-220-3 packaging and 45 V / 20 A ratings but may exhibit variations in forward voltage drop, reverse leakage current, or operating temperature range.

Similar Alternatives (Reduced Current Rating or Voltage Variation): Parts that maintain the 45 V reverse voltage and Schottky technology but operate at reduced current ratings (10 A, 15 A) or alternative voltage ratings (40 V, 50 V). These are suitable only when circuit design permits lower current capacity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package	Product Status	Reverse Leakage @ Vr
STPS4045CT	STMicroelectronics	45 V	20 A	760 mV @ 20 A	TO-220-3	Obsolete	200 µA @ 45 V
STPS4045CW	STMicroelectronics	45 V	20 A	760 mV @ 20 A	TO-247-3	Active	200 µA @ 45 V
STPS4045CWY	STMicroelectronics	45 V	20 A	760 mV @ 20 A	TO-247-3	Active	200 µA @ 45 V
MBR4045CT	SMC Diode Solutions	45 V	Not Specified	600 mV @ 20 A	TO-220-3	Active	1 mA @ 45 V
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	TO-220-3	Obsolete	500 µA @ 45 V
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	TO-220-3	Obsolete	1 mA @ 50 V
SBR4040CT	Diodes Incorporated	40 V	20 A	530 mV @ 20 A	TO-220-3	Active	500 µA @ 40 V
VS-20CTQ045-M3	Vishay General Semiconductor - Diodes Division	45 V	20 A	760 mV @ 20 A	TO-220-3	Active	2 mA @ 45 V

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: VS-20CTQ045-M3 (Vishay) is the preferred substitute for STPS4045CT. This part maintains identical electrical specifications (45 V, 20 A, 760 mV forward voltage, fast recovery speed) in the same TO-220-3 package. The part is active product status with 8555 units in stock, ensuring long-term availability. Reverse leakage current is 2 mA at 45 V, marginally higher than the original 200 µA but within acceptable tolerance for most applications.

Alternative for Package Flexibility: STPS4045CW or STPS4045CWY (STMicroelectronics) provide identical electrical performance with active product status. These parts are packaged in TO-247-3, which offers improved thermal characteristics through larger lead frame geometry. STPS4045CWY includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C to 175°C), suitable for automotive and industrial applications.

Lower Voltage Alternative: SBR4040CT (Diodes Incorporated) is suitable only when circuit design permits 40 V reverse voltage operation. This part offers superior forward voltage performance (530 mV at 20 A versus 760 mV), reducing power dissipation. The part is active product status with 15697 units in stock. However, the 5 V voltage margin reduction must be verified against circuit requirements.

Not Recommended: MBR20L45CTG and MBR2550CT are obsolete products and should not be selected for new designs. These parts do not provide availability advantages over the primary recommendations.

Frequently Asked Questions (FAQ)

Q: Can STPS4045CW or STPS4045CWY be used as direct replacements for STPS4045CT?

A: Electrically, yes. Both parts maintain identical 45 V, 20 A, and 760 mV specifications. The primary difference is package format: STPS4045CT uses TO-220-3 while STPS4045CW and STPS4045CWY use TO-247-3. PCB layout modifications are required to accommodate the larger TO-247-3 footprint. STPS4045CWY includes automotive qualification if required by application.

Q: Is VS-20CTQ045-M3 a true equivalent to STPS4045CT?

A: Yes. VS-20CTQ045-M3 maintains all critical electrical parameters: 45 V reverse voltage, 20 A average rectified current, 760 mV forward voltage at 20 A, and fast recovery speed. Both use TO-220-3 packaging. Reverse leakage current is 2 µA at 45 V compared to 200 µA in the original, representing improved performance. The part is active product status with high inventory availability.

Q: Why is SBR4040CT listed as a substitute if it has only 40 V rating?

A: SBR4040CT is listed as a similar alternative for applications where 40 V reverse voltage is sufficient. The 5 V reduction in voltage rating must be verified against circuit maximum voltage conditions. The part offers superior forward voltage performance (530 mV versus 760 mV), reducing power dissipation by approximately 30%. This part is active product status with high inventory.

Q: Can MBR4045CT replace STPS4045CT?

A: MBR4045CT maintains 45 V reverse voltage and TO-220-3 packaging. However, the average rectified current specification is not provided in the datasheet, creating uncertainty in current capacity verification. Forward voltage is lower (600 mV at 20 A), and reverse leakage is higher (1 mA at 45 V). This part is active product status but should be verified against specific application requirements before selection.

Q: What is the difference between STPS4045CW and STPS4045CWY?

A: Both parts are electrically identical with 45 V, 20 A, and 760 mV specifications in TO-247-3 packaging. STPS4045CWY includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C to 175°C) suitable for automotive applications. STPS4045CW has standard operating temperature range. Selection depends on application requirements.

Q: Are MBR20L45CTG and MBR2550CT suitable for new designs?

A: No. Both parts are classified as obsolete product status. MBR20L45CTG operates at reduced 10 A current rating, and MBR2550CT operates at 50 V with 15 A current rating. Neither provides advantages over active alternatives. New designs should use VS-20CTQ045-M3, STPS4045CW, or STPS4045CWY.

Q: What are the thermal considerations when switching from TO-220-3 to TO-247-3 packaging?

A: TO-247-3 packaging provides larger lead frame geometry and improved thermal dissipation compared to TO-220-3. When upgrading from STPS4045CT (TO-220-3) to STPS4045CW or STPS4045CWY (TO-247-3), thermal performance improves, allowing for higher ambient temperature operation or reduced heatsink requirements. PCB layout must be modified to accommodate the larger package footprint.

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