40CPQ045 Equivalent & Substitute Parts

Part Overview

The 40CPQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 45 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in TO-247-3 through-hole configuration and features fast recovery characteristics with switching speed ≤ 500 ns at currents > 200 mA.

The 40CPQ045 is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including IXYS, STMicroelectronics, and SMC Diode Solutions, offering continued design support and supply chain availability for applications requiring Schottky diode array functionality within the specified electrical parameters.

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)	20 A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 40CPQ045 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-247-3

Allowable Parameter Variations:

Current - Average Rectified (Io) (per Diode): Equal to or greater than 20 A
Voltage - Forward (Vf) (Max) @ If: May vary within acceptable design margins
Operating Temperature - Junction: May extend beyond -55°C ~ 150°C range
Current - Reverse Leakage @ Vr: May vary within acceptable design margins
RoHS Status: May differ from original specification

Substitute parts are grouped into two categories: MFR Recommended parts offering direct functional equivalence or enhanced specifications, and Parametric Equivalent parts providing identical electrical performance with updated compliance status.

Parameter Comparison

Parameter	40CPQ045 (Vishay)	DSA30C45HB (IXYS)	DSSK80-0045B (IXYS)	STPS4045CW (STMicroelectronics)	STPS4045CWY (STMicroelectronics)	40CPQ045 (SMC Diode Solutions)
Diode Configuration	1 Pair Common Cathode	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	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	15 A	40 A	20 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 20 A	740 mV @ 15 A	510 mV @ 40 A	760 mV @ 20 A	760 mV @ 20 A	490 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	4 mA @ 45 V	250 µA @ 45 V	30 mA @ 45 V	200 µA @ 45 V	200 µA @ 45 V	4 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-40°C ~ 175°C (Max)	-40°C ~ 175°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: The 40CPQ045 manufactured by SMC Diode Solutions provides identical electrical specifications to the original Vishay part, including matching forward voltage characteristics (490 mV @ 20 A) and reverse leakage current (4 mA @ 45 V). This part is classified as active and ROHS3 compliant, offering the most direct replacement path for existing designs.

MFR Recommended Substitutes:

STPS4045CW and STPS4045CWY (STMicroelectronics): Both parts match the 20 A current rating and 45 V voltage specification of the original device. The STPS4045CWY variant includes automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40°C ~ 175°C), suitable for applications requiring automotive compliance. Both variants are ROHS3 compliant and active products with higher inventory availability (1990 and 3400 units respectively).

DSSK80-0045B (IXYS): This part provides enhanced current capability at 40 A per diode, exceeding the 20 A requirement of the original specification. It maintains the 45 V voltage rating and fast recovery characteristics. The part is ROHS3 compliant and active. Applications requiring higher current capacity may benefit from this option.

DSA30C45HB (IXYS): This part is rated for 15 A per diode, below the 20 A specification of the original device. It is suitable only for applications where the actual operating current does not exceed 15 A. The part features extended operating temperature range (-55°C ~ 175°C) and is ROHS3 compliant.

Compliance Considerations: All substitute parts are ROHS3 compliant, addressing the non-compliant status of the original 40CPQ045. Applications subject to RoHS regulations require selection from the compliant alternatives.

Frequently Asked Questions (FAQ)

Q: Can the DSA30C45HB (15 A) be used as a direct replacement for the 40CPQ045 (20 A)?

A: The DSA30C45HB is suitable only if the application's actual operating current does not exceed 15 A. The part is rated for lower average rectified current than the original specification. Circuit analysis must confirm that peak and average currents remain within the 15 A limit.

Q: What is the difference between STPS4045CW and STPS4045CWY?

A: Both parts are electrically identical with matching 20 A current rating, 45 V voltage specification, and forward voltage characteristics. The STPS4045CWY includes automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40°C ~ 175°C) compared to the STPS4045CW maximum of 175°C. Selection depends on application requirements for automotive compliance.

Q: Is the DSSK80-0045B (40 A) a suitable replacement for the 40CPQ045 (20 A)?

A: The DSSK80-0045B meets all mandatory substitution criteria and exceeds the current specification. It is suitable for direct replacement in applications where the 40 A capability does not introduce thermal or design complications. The higher current rating provides design margin for future application scaling.

Q: Are all substitute parts available in the same TO-247-3 package?

A: All substitute parts are packaged in TO-247-3 through-hole configuration, matching the original device. Supplier device package designations may vary (TO-247-3, TO-247-3, TO-247-AD, TO-247-AD) but all are mechanically and electrically compatible with TO-247-3 footprints.

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

A: Forward voltage varies among substitutes: the original 40CPQ045 and SMC equivalent specify 490 mV @ 20 A, while STMicroelectronics parts specify 760 mV @ 20 A. Higher forward voltage increases power dissipation in the diode. Circuit thermal analysis is required if forward voltage differences exceed design margins.

Q: Which substitute part is recommended for new designs?

A: For new designs requiring RoHS compliance, the STPS4045CWY (STMicroelectronics) is recommended for applications requiring automotive qualification, or the STPS4045CW for general industrial applications. Both are active products with established supply chains and ROHS3 compliance. The SMC Diode Solutions 40CPQ045 is recommended for designs requiring exact electrical parameter matching to the original specification.

Q: Can reverse leakage current differences affect circuit performance?

A: Reverse leakage current varies significantly among substitutes, ranging from 4 mA (original and SMC equivalent) to 250 µA (DSA30C45HB) and 30 mA (DSSK80-0045B). Applications sensitive to leakage current, such as precision analog circuits or high-impedance designs, require careful evaluation of leakage specifications.

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