STPS1645D Schottky Diode Equivalent & Substitute Parts

Part Overview

The STPS1645D is a 45V, 16A Schottky rectifier diode manufactured by STMicroelectronics in a TO-220AC through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting the same packaging and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 16 A	mV
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Operating Temperature - Junction (Max)	175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STPS1645D are selected based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 16 A minimum
Package / Case: TO-220-2
Mounting Type: Through Hole
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variations:

Forward voltage (Vf) may vary within acceptable design margins
Reverse leakage current may differ provided it does not exceed system requirements
Operating temperature range may exceed the original specification
Product status may transition from obsolete to active

All identified substitutes meet or exceed the mandatory electrical and mechanical requirements of the STPS1645D.

Parameter Comparison

Parameter	STPS1645D (STMicroelectronics)	MBR1645 (Taiwan Semiconductor)	MBR1645-BP (Micro Commercial Co)	VT2045BP-M3/4W (Vishay)
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	16 A	16 A	16 A	20 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 16 A	630 mV @ 16 A	Not specified	660 mV @ 20 A
Current - Reverse Leakage @ Vr	200 µA @ 45 V	500 µA @ 45 V	200 µA @ 45 V	2 mA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	175°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	200°C (Max)
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

MBR1645 (Taiwan Semiconductor Corporation)

The MBR1645 is a direct electrical equivalent with identical voltage and current ratings. This part is in active production status, ensuring long-term availability. The forward voltage specification of 630 mV at 16 A represents a 60 mV increase over the STPS1645D; this variance is within typical design tolerances for Schottky rectifier applications. The reverse leakage current of 500 µA is elevated compared to the original specification but remains acceptable for most power conversion circuits. Operating temperature range of -55°C to 150°C is narrower than the STPS1645D maximum of 175°C; thermal design verification is required for applications approaching 150°C junction temperature.

MBR1645-BP (Micro Commercial Co)

The MBR1645-BP provides identical electrical specifications to the STPS1645D, including matching reverse leakage current of 200 µA at 45 V. This part is actively manufactured and available in bulk packaging. Operating temperature range matches the MBR1645 at -55°C to 150°C. The MBR1645-BP is suitable for applications requiring minimal deviation from original component specifications.

VT2045BP-M3/4W (Vishay General Semiconductor - Diodes Division)

The VT2045BP-M3/4W is a higher-current variant rated for 20 A average rectified current, providing 25% additional current capacity over the STPS1645D. This part maintains the 45 V reverse voltage rating and TO-220-2 package compatibility. The maximum junction temperature of 200°C exceeds the STPS1645D specification by 25°C. Forward voltage at 20 A is specified as 660 mV; direct comparison at 16 A is not provided. Reverse leakage current of 2 mA at 45 V is significantly higher than the original part. The VT2045BP-M3/4W is appropriate for designs requiring enhanced thermal performance or higher current margins, provided that elevated leakage current does not compromise system efficiency or thermal management.

All three substitute parts are ROHS3 compliant and maintain the TO-220AC through-hole package configuration.

Frequently Asked Questions (FAQ)

Q: Can the MBR1645 directly replace the STPS1645D in existing designs?

A: The MBR1645 meets all mandatory electrical and mechanical requirements. The 60 mV increase in forward voltage drop and 300 µA increase in reverse leakage current must be evaluated within the specific circuit application. Thermal design verification is required if the application operates near 150°C junction temperature, as the MBR1645 maximum is 150°C compared to the STPS1645D maximum of 175°C.

Q: What is the difference between MBR1645 and MBR1645-BP?

A: Both parts share identical electrical specifications and are manufactured by different suppliers (Taiwan Semiconductor Corporation versus Micro Commercial Co). The MBR1645-BP is supplied in bulk packaging, while the MBR1645 packaging format is not specified in the provided data. Selection between these parts depends on procurement requirements and packaging preferences.

Q: Is the VT2045BP-M3/4W suitable as a direct replacement?

A: The VT2045BP-M3/4W maintains voltage and package compatibility but operates at 20 A versus the original 16 A specification. The higher current rating provides design margin but introduces elevated reverse leakage current of 2 mA. This part is appropriate for applications where increased current capacity or higher maximum junction temperature (200°C) provides system benefits. Forward voltage comparison at identical current levels is not available from the provided specifications.

Q: Are all substitute parts RoHS3 compliant?

A: The MBR1645 and MBR1645-BP RoHS status is not specified in the provided data. The VT2045BP-M3/4W is confirmed ROHS3 compliant. Compliance verification with the component supplier is required for the MBR1645 and MBR1645-BP before design release.

Q: What packaging formats are available for these substitute parts?

A: All substitute parts are supplied in TO-220-2 through-hole packages. The MBR1645-BP is available in bulk packaging. The VT2045BP-M3/4W is supplied in tube packaging. Packaging selection affects procurement logistics and component handling procedures.

Q: How do reverse leakage currents affect circuit performance?

A: Reverse leakage current flows when the diode is reverse-biased and contributes to standby power consumption and thermal generation. The STPS1645D and MBR1645-BP specify 200 µA, the MBR1645 specifies 500 µA, and the VT2045BP-M3/4W specifies 2 mA at 45 V. Applications with stringent standby power requirements or high-impedance circuits must account for these differences in system-level power budgets.

Q: Can forward voltage differences impact thermal design?

A: Forward voltage drop directly affects power dissipation in the diode. The STPS1645D specifies 570 mV at 16 A, while the MBR1645 specifies 630 mV at 16 A. This 60 mV difference results in approximately 960 mW additional power dissipation at full current. Thermal design calculations must incorporate the substitute part's forward voltage specification to ensure adequate heat dissipation and junction temperature compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message