MBR1545CTH Equivalent & Substitute Parts

Part Overview

The MBR1545CTH is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 15 A per diode. The device is packaged in TO-220-3 through-hole format and is qualified to AEC-Q101 automotive standards. This part is discontinued at DiGi Electronics, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility for ongoing applications.

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)	15 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR1545CTH is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-220-3

Performance Parameters (Allow Variation Within Limits):

Current - Average Rectified (Io) (per Diode): Substitute must support minimum 15 A
Voltage - Forward (Vf) (Max) @ If: Substitute forward voltage must not exceed application requirements
Current - Reverse Leakage @ Vr: Substitute leakage current must be acceptable for circuit operation
Operating Temperature - Junction: Substitute must cover or exceed the required temperature range

Substitute parts are grouped into three categories based on current rating:

Category 1 - Lower Current Rating (5 A - 7.5 A): VT1045CBP-M3/4W, VT1045C-M3/4W, MBR1545CT-E3/45. These parts share the 45 V reverse voltage and TO-220-3 package but have reduced current capacity. Suitable only for applications where 15 A is not required.

Category 2 - Equivalent Current Rating (10 A - 15 A): MBR2045CT-LJ-01, MBR20L45CTG, MBR2545CT-E3/45, MBR3045CT-BP, MBR3045CTE3/TU, MBR3045FCTE3/TU. These parts maintain 45 V reverse voltage, TO-220-3 package, and support 10 A to 15 A current ratings.

Category 3 - Higher Current Rating (20 A): STPS40L45CT. This part exceeds the 15 A requirement with 20 A capability while maintaining 45 V reverse voltage and TO-220-3 package.

Parameter Comparison

Part Number	Manufacturer	Io (per Diode)	Vr (Max)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	AEC-Q101
MBR1545CTH	Taiwan Semiconductor	15 A	45 V	840 mV @ 15 A	500 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Discontinued	Yes
MBR1545CT-E3/45	Vishay	7.5 A	45 V	570 mV @ 7.5 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	No
MBR2045CT-LJ-01	Diodes Incorporated	10 A	45 V	640 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	Yes
MBR20L45CTG	onsemi	10 A	45 V	500 mV @ 10 A	500 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Obsolete	No
MBR2545CT-E3/45	Vishay	15 A	45 V	820 mV @ 30 A	200 µA @ 45 V	-65°C ~ 150°C	TO-220-3	Active	No
MBR3045CT-BP	Micro Commercial Co	15 A	45 V	700 mV @ 15 A	200 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	No
MBR3045CTE3/TU	Microchip Technology	15 A	45 V	700 mV @ 15 A	50 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	No
MBR3045FCTE3/TU	Microchip Technology	15 A	45 V	700 mV @ 15 A	50 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active	No
STPS40L45CT	STMicroelectronics	20 A	45 V	530 mV @ 20 A	600 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active	No
VT1045CBP-M3/4W	Vishay	5 A	45 V	580 mV @ 5 A	500 µA @ 45 V	-40°C ~ 200°C	TO-220-3	Active	No
VT1045C-M3/4W	Vishay	5 A	45 V	580 mV @ 5 A	500 µA @ 45 V	-40°C ~ 150°C	TO-220-3	Active	No

Engineering Selection Recommendations

For Direct Replacement (15 A Current Requirement):

MBR3045CTE3/TU and MBR3045FCTE3/TU from Microchip Technology are the preferred direct replacements. Both parts maintain the 15 A current rating, 45 V reverse voltage, and TO-220-3 package. These devices feature lower reverse leakage current (50 µA) compared to the original MBR1545CTH (500 µA) and support an extended operating temperature range of -65°C to 175°C. Both parts are currently in active production status with substantial inventory availability.

MBR3045CT-BP from Micro Commercial Co is an alternative direct replacement with identical 15 A current rating and 45 V reverse voltage. This part offers lower forward voltage (700 mV @ 15 A) compared to the original specification (840 mV @ 15 A), which may provide improved thermal performance in power conversion applications.

MBR2545CT-E3/45 from Vishay is a functionally equivalent option with 15 A current rating and 45 V reverse voltage. This part is actively produced and available in tube packaging.

For Applications Tolerating Reduced Current (10 A Requirement):

MBR2045CT-LJ-01 from Diodes Incorporated is suitable for applications requiring 10 A maximum current. This part maintains AEC-Q101 automotive qualification, matching the original part's automotive grade. Operating temperature range is -55°C to 150°C, identical to the original specification.

For Applications Requiring Higher Current Capacity (20 A Requirement):

STPS40L45CT from STMicroelectronics provides 20 A current capacity with 45 V reverse voltage in TO-220-3 package. This part is suitable for applications where current requirements exceed 15 A. Forward voltage is 530 mV @ 20 A, lower than the original part.

Avoid for Direct Replacement:

MBR20L45CTG (onsemi) is obsolete and should not be selected for new designs despite active inventory. VT1045CBP-M3/4W and VT1045C-M3/4W have reduced current ratings (5 A) and are unsuitable for applications requiring 15 A operation. MBR1545CT-E3/45 has reduced current rating (7.5 A) and is not suitable for full 15 A applications.

Frequently Asked Questions (FAQ)

Q: Can MBR3045CTE3/TU directly replace MBR1545CTH without circuit modification?

A: Yes. Both parts share identical diode configuration (1 pair common cathode), reverse voltage rating (45 V), current rating (15 A), and TO-220-3 package. The MBR3045CTE3/TU features lower reverse leakage current and extended temperature range, making it functionally compatible. Pin-to-pin compatibility is maintained.

Q: What is the difference between MBR3045CTE3/TU and MBR3045FCTE3/TU?

A: Both parts are electrically identical with 15 A current rating, 45 V reverse voltage, 700 mV forward voltage @ 15 A, and -65°C to 175°C operating temperature range. The "F" designation in MBR3045FCTE3/TU indicates a variant designation from Microchip Technology. Both are suitable direct replacements for MBR1545CTH.

Q: Why is MBR1545CT-E3/45 listed as a substitute if it has only 7.5 A rating?

A: MBR1545CT-E3/45 shares the same base part number (MBR1545) and maintains 45 V reverse voltage with TO-220-3 package. However, the reduced 7.5 A current rating makes it unsuitable for applications requiring the full 15 A specification of MBR1545CTH. This part is listed only for reference in applications where current requirements are lower.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is mandatory for automotive applications. MBR1545CTH and MBR2045CT-LJ-01 both carry AEC-Q101 qualification. If your application requires automotive-grade components, select from these qualified parts. Other substitute options lack this certification.

Q: Can STPS40L45CT be used in place of MBR1545CTH?

A: STPS40L45CT is electrically compatible with 45 V reverse voltage and TO-220-3 package. The 20 A current rating exceeds the 15 A requirement, and forward voltage is lower (530 mV @ 20 A). This part is suitable for applications where higher current capacity is beneficial or acceptable. However, it lacks AEC-Q101 qualification if automotive compliance is required.

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

A: Forward voltage differences affect power dissipation and thermal performance. Lower forward voltage (such as STPS40L45CT at 530 mV) results in reduced power loss compared to higher forward voltage (such as MBR1545CTH at 840 mV). In rectifier applications, this difference is typically 0.3 W per ampere at full current. Circuit thermal analysis should account for these differences if operating near thermal limits.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance, matching the original MBR1545CTH specification. All parts are also REACH unaffected and carry EAR99 ECCN classification.

Q: What is the significance of reverse leakage current variation among substitutes?

A: Reverse leakage current affects circuit performance in high-impedance applications and standby power consumption. MBR3045CTE3/TU and MBR3045FCTE3/TU feature the lowest reverse leakage (50 µA @ 45 V), while STPS40L45CT has the highest (600 µA @ 45 V). For most power rectification applications, this variation is negligible. For precision analog circuits or low-power standby operation, lower leakage is preferable.

Q: Can I use a lower current-rated part such as MBR2045CT-LJ-01 (10 A) in a circuit designed for MBR1545CTH (15 A)?

A: Only if the actual circuit current requirement does not exceed 10 A. Using a lower-rated part in an application requiring 15 A will result in device failure or thermal runaway. Circuit current analysis must confirm that peak and average currents remain below 10 A before selecting this substitute.

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