MBR740 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MBR740 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 7.5 A average rectified current in a Through Hole TO-220AC package. Manufactured by Diodes Incorporated, this component is classified as Obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts with matching or superior electrical specifications are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	7.5 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 40 V
Capacitance @ Vr, F	400pF @ 4V, 1MHz
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitute parts for the MBR740 are qualified based on the following criteria:

Direct Electrical Equivalence (Group 1): Parts maintaining identical voltage and current ratings (40 V, 7.5 A) with matching forward voltage, reverse leakage, and switching speed characteristics. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgraded Electrical Specifications (Group 2): Parts with increased voltage ratings (45 V) while maintaining identical current capacity (7.5 A) and switching performance. These parts provide enhanced voltage margin and are backward-compatible with 40 V applications.

All substitute parts share the following mandatory parameters:

Technology: Schottky
Current - Average Rectified (Io): 7.5 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: TO-220-2
Current - Reverse Leakage @ Vr: 100 µA

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Speed	Package	Operating Temp (Junction)	Product Status
MBR740	Diodes Incorporated	40 V	7.5 A	840 mV @ 15 A	100 µA @ 40 V	Fast Recovery ≤ 500ns	TO-220-2	-55°C ~ 150°C	Obsolete
MBR740-BP	Micro Commercial Co	40 V	7.5 A	Not Specified	100 µA @ 40 V	Fast Recovery ≤ 500ns	TO-220-2	-55°C ~ 150°C	Active
MBR745-BP	Micro Commercial Co	45 V	7.5 A	Not Specified	100 µA @ 45 V	Fast Recovery ≤ 500ns	TO-220-2	-55°C ~ 150°C	Active
MBR745G	onsemi	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	Fast Recovery ≤ 500ns	TO-220-2	-65°C ~ 175°C	Active
STPS745D	STMicroelectronics	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	Fast Recovery ≤ 500ns	TO-220-2	-55°C ~ 175°C	Active

Engineering Selection Recommendations

MBR740-BP (Micro Commercial Co): Direct equivalent with identical electrical and thermal specifications. Active product status ensures ongoing availability. Suitable for direct replacement in existing designs without modification. Bulk packaging available.

MBR745-BP (Micro Commercial Co): Upgraded voltage rating (45 V vs. 40 V) with identical current capacity. Active product status. Backward-compatible with MBR740 applications. Bulk packaging available.

MBR745G (onsemi): Upgraded voltage rating (45 V) with extended operating temperature range (-65°C to 175°C vs. -55°C to 150°C). Active product status with high inventory availability. SWITCHMODE™ series designation. RoHS3 compliant. Tube packaging.

STPS745D (STMicroelectronics): Upgraded voltage rating (45 V) with extended maximum junction temperature (175°C). Active product status with substantial inventory. RoHS3 compliant. Tube packaging.

All substitute parts maintain Through Hole TO-220-2 package compatibility and Schottky technology classification. Selection between 40 V and 45 V rated parts depends on circuit voltage requirements and design margin specifications.

Frequently Asked Questions (FAQ)

Q: Can MBR740-BP be used as a direct replacement for MBR740?

A: Yes. MBR740-BP maintains identical voltage (40 V), current (7.5 A), reverse leakage (100 µA @ 40 V), and switching speed specifications. Both parts use TO-220-2 package configuration. The primary difference is product status: MBR740-BP is Active while MBR740 is Obsolete.

Q: What is the difference between 40 V and 45 V rated parts?

A: The 40 V rating (MBR740, MBR740-BP) specifies maximum reverse voltage. The 45 V rating (MBR745-BP, MBR745G, STPS745D) provides 5 V additional voltage margin. Both ratings maintain identical 7.5 A current capacity and switching characteristics. 45 V parts are backward-compatible with 40 V applications.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed substitute parts use TO-220-2 package configuration with identical pin assignments. Through Hole mounting type is consistent across all parts.

Q: What are the temperature operating range differences?

A: MBR740 and MBR740-BP: -55°C to 150°C. MBR745-BP: -55°C to 150°C. MBR745G: -65°C to 175°C. STPS745D: -55°C to 175°C. Selection depends on application thermal requirements.

Q: Which substitute has the highest inventory availability?

A: MBR745G (onsemi) has 21,700 pieces in stock, the highest among all listed alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: MBR740 (original): RoHS3 Compliant. MBR740-BP: Not specified. MBR745-BP: Not specified. MBR745G: RoHS3 Compliant. STPS745D: RoHS3 Compliant.

Q: What is the forward voltage specification for all parts?

A: MBR740: 840 mV @ 15 A. MBR740-BP: Not specified. MBR745-BP: Not specified. MBR745G: 840 mV @ 15 A. STPS745D: 840 mV @ 15 A.

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