Equivalent & Substitute Parts for 40L45CW

Part Overview

The 40L45CW is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode device rated for 45 V DC reverse voltage and 20 A average rectified current per diode. The component is housed in a TO-247-3 through-hole package and features fast recovery characteristics with a maximum forward voltage of 530 mV at 20 A.

The 40L45CW is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or enhanced electrical specifications are available from multiple manufacturers.

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	530 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1.5	mA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 40L45CW is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 20 A
Package / Case: TO-247-3
Mounting Type: Through Hole
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Parametric Equivalents maintain identical electrical specifications and are direct replacements with no circuit redesign required.

Manufacturer Recommended Substitutes include parts with enhanced current ratings (40 A) or alternative forward voltage characteristics, suitable for applications where the original specification can accommodate higher performance margins.

Voltage-Rated Variants (such as 15 V rated devices) are not suitable substitutes and are listed for reference only to prevent selection errors.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV]	Ir @ Vr [mA/µA]	Tj (Operating) [°C]	RoHS Status	Package
40L45CW	Vishay General Semiconductor - Diodes Division	Obsolete	45	20	530 @ 20 A	1.5 mA	-55 to 150	RoHS non-compliant	TO-247-3
VS-40L45CW-N3	Vishay General Semiconductor - Diodes Division	Active	45	20	530 @ 20 A	1.5 mA	-55 to 150	ROHS3 Compliant	TO-247-3
VS-STPS40L45CW-N3	Vishay General Semiconductor - Diodes Division	Active	45	20	530 @ 20 A	1.5 mA	-55 to 150	ROHS3 Compliant	TO-247-3
STPS40L45CW	STMicroelectronics	Active	45	20	530 @ 20 A	600 µA	-55 to 150	ROHS3 Compliant	TO-247-3
STPS4045CWY	STMicroelectronics	Active	45	20	760 @ 20 A	200 µA	-40 to 175	ROHS3 Compliant	TO-247-3
DSSK80-0045B	IXYS	Active	45	40	510 @ 40 A	30 mA	-55 to 150	ROHS3 Compliant	TO-247-3

Engineering Selection Recommendations

Direct Parametric Equivalents (Preferred for Replacement):

VS-40L45CW-N3 and VS-STPS40L45CW-N3 are direct functional equivalents to the obsolete 40L45CW. Both devices maintain identical electrical specifications across all critical parameters: 45 V reverse voltage rating, 20 A average rectified current, 530 mV forward voltage at 20 A, and -55°C to 150°C operating temperature range. Both are manufactured by Vishay General Semiconductor - Diodes Division and are ROHS3 compliant, addressing regulatory requirements that the original part does not meet. These parts are classified as active products with confirmed inventory availability.

Alternative Active Source (STMicroelectronics):

STPS40L45CW from STMicroelectronics provides electrical equivalence with identical voltage and current ratings. This part exhibits lower reverse leakage current (600 µA versus 1.5 mA) and is ROHS3 compliant. The maximum operating junction temperature is specified as 150°C (maximum) rather than a range, which is functionally equivalent for applications operating within the -55°C to 150°C envelope.

Automotive-Grade Alternative:

STPS4045CWY is an automotive-qualified variant (AEC-Q101) with identical 45 V and 20 A ratings. This part exhibits higher forward voltage (760 mV at 20 A) and lower reverse leakage (200 µA), with an extended maximum operating temperature of 175°C. Selection of this part is appropriate for automotive applications or where enhanced temperature margin is required, provided circuit design accommodates the higher forward voltage drop.

Enhanced Current Rating Option:

DSSK80-0045B from IXYS provides a 45 V rating with doubled current capacity (40 A per diode). This part is suitable for applications where the original 20 A specification represents a design margin constraint. The forward voltage at rated current (510 mV @ 40 A) is comparable to the original specification. Higher reverse leakage current (30 mA) must be evaluated against application requirements.

Not Recommended for Direct Substitution:

STPS40L15CW is a 15 V rated device and is not suitable as a substitute for the 45 V rated 40L45CW. This part is listed in the provided data for reference only.

Frequently Asked Questions (FAQ)

Q: Can VS-40L45CW-N3 be used as a direct replacement for the obsolete 40L45CW?

A: Yes. VS-40L45CW-N3 is a parametric equivalent with identical electrical specifications: 45 V reverse voltage, 20 A average rectified current, 530 mV forward voltage at 20 A, and -55°C to 150°C operating temperature. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What is the difference between VS-40L45CW-N3 and VS-STPS40L45CW-N3?

A: Both parts are manufactured by Vishay and maintain identical electrical specifications. The primary distinction is the base product number designation (40L45 versus STPS40). Both are active products with ROHS3 compliance and equivalent performance characteristics. Selection between these parts may be based on supplier availability or internal part numbering conventions.

Q: Why does STPS4045CWY have a higher forward voltage (760 mV) compared to the original 40L45CW (530 mV)?

A: STPS4045CWY is an automotive-grade device qualified to AEC-Q101 standards with an extended operating temperature range (-40°C to 175°C). The higher forward voltage is a characteristic of this specific device design. Circuit designs must account for this voltage drop when selecting this part. The higher forward voltage does not affect package compatibility or electrical interface.

Q: Is DSSK80-0045B a suitable substitute if my application requires higher current capacity?

A: DSSK80-0045B is suitable for applications where current capacity exceeding 20 A is required. This part maintains the 45 V reverse voltage rating and TO-247-3 package compatibility. The doubled current rating (40 A per diode) and comparable forward voltage (510 mV @ 40 A) make it appropriate for higher-power applications. Reverse leakage current is higher (30 mA), which must be evaluated against application thermal and power dissipation requirements.

Q: Are all substitute parts RoHS compliant?

A: The original 40L45CW is RoHS non-compliant. All recommended active substitutes (VS-40L45CW-N3, VS-STPS40L45CW-N3, STPS40L45CW, STPS4045CWY, and DSSK80-0045B) are ROHS3 compliant. This compliance status addresses regulatory requirements for new designs and ongoing production.

Q: Can I use STPS40L15CW as a substitute?

A: No. STPS40L15CW is rated for 15 V maximum reverse voltage, compared to the 45 V rating of the 40L45CW. This part is not suitable for applications requiring 45 V reverse voltage protection. Substitution would result in inadequate voltage rating and potential device failure.

Q: What is the significance of the TO-247-3 package designation?

A: TO-247-3 is a through-hole package with three leads, standardized across all substitute parts listed. This package designation ensures mechanical and thermal compatibility with existing printed circuit board layouts. All recommended substitutes maintain this package standard, eliminating the need for board redesign.

Q: How do I determine which substitute part is best for my application?

A: Selection depends on specific application requirements: (1) For direct replacement with no circuit changes, select VS-40L45CW-N3 or VS-STPS40L45CW-N3; (2) For automotive applications, select STPS4045CWY; (3) For applications requiring higher current capacity, select DSSK80-0045B; (4) For alternative active sourcing, select STPS40L45CW from STMicroelectronics. All selections must verify compatibility with circuit design parameters including forward voltage drop, reverse leakage current, and operating temperature range.

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