MBRB1545CT-T Equivalent & Substitute Parts

Part Overview

The MBRB1545CT-T is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with a maximum reverse voltage rating of 45 V and average rectified current of 15 A per diode. The device is housed in a TO-263-3 D2PAK surface mount package with 2 leads plus tab configuration.

This part is classified as obsolete. Identification of equivalent and substitute components is necessary to maintain design continuity and ensure availability for new production builds, repairs, and field replacements where the original part is no longer procurable from primary sources.

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)	15	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 7.5 A	—
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRB1545CT-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount

Current Rating Consideration: The MBRB1545CT-T specifies 15 A average rectified current per diode. Substitute parts with equal or greater current ratings maintain full functional compatibility. Substitute parts with lower current ratings operate within reduced current envelopes and require circuit-level evaluation.

Secondary Parameters: Forward voltage, reverse recovery time, reverse leakage current, and operating temperature range are provided for detailed circuit analysis but do not disqualify substitution when primary parameters align.

Parameter Comparison

Parameter	MBRB1545CT-T (Diodes Inc.)	STPS1545CG-TR (STMicroelectronics)	DSTB2045C (Littelfuse Inc.)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	7.5 A	10 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 7.5 A	570 mV @ 7.5 A	580 mV @ 10 A
Speed	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	100 µA @ 45 V	100 µA @ 45 V	2 mA @ 45 V
Operating Temperature - Junction	-65 to 150 °C	175 °C (Max)	-55 to 150 °C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

STPS1545CG-TR (STMicroelectronics)

This substitute is electrically compatible with the MBRB1545CT-T across all mandatory parameters. The part is currently in active production status, ensuring long-term availability. ROHS3 compliance and MSL 1 rating match the original specification. The STPS1545CG-TR operates at a reduced current rating of 7.5 A per diode compared to the original 15 A specification. Forward voltage performance is superior at 570 mV versus 700 mV. This part is suitable for applications where the circuit current demand does not exceed 7.5 A per diode.

DSTB2045C (Littelfuse Inc.)

This substitute maintains full electrical compatibility with the MBRB1545CT-T across all mandatory parameters. The part is in active production status with established supply chain availability. ROHS3 compliance and MSL 1 rating align with the original specification. The DSTB2045C operates at 10 A average rectified current per diode, positioning it between the original 15 A rating and the STPS1545CG-TR at 7.5 A. Forward voltage is 580 mV at 10 A. Reverse leakage current is specified at 2 mA, higher than both the original part and the STPS1545CG-TR. This part is suitable for applications where circuit current demand ranges from 7.5 A to 10 A per diode.

Frequently Asked Questions (FAQ)

Q: Can STPS1545CG-TR be used as a direct replacement for MBRB1545CT-T in all applications?

A: The STPS1545CG-TR is electrically compatible in package, configuration, voltage rating, and technology. However, the current rating is reduced from 15 A to 7.5 A per diode. Direct substitution is valid only in circuits where the maximum current per diode does not exceed 7.5 A. Circuits designed for the full 15 A capability require evaluation.

Q: What is the difference between STPS1545CG-TR and DSTB2045C?

A: Both parts share the same 45 V reverse voltage rating, Schottky technology, common cathode configuration, and TO-263-3 D2PAK package. The primary differences are current rating (STPS1545CG-TR at 7.5 A, DSTB2045C at 10 A per diode), forward voltage characteristics, and reverse leakage current (DSTB2045C at 2 mA versus STPS1545CG-TR at 100 µA). Selection depends on circuit current requirements and leakage specifications.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-263-3 D2PAK package with 2 leads plus tab configuration. Physical and electrical pin assignments are identical, enabling direct PCB footprint compatibility.

Q: What is the significance of the obsolete status of MBRB1545CT-T?

A: Obsolete status indicates the part is no longer manufactured by Diodes Incorporated and is not available from primary distribution channels. Existing inventory may be available from secondary sources, but long-term supply cannot be assured. Use of active production substitutes ensures design continuity and future availability.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. Both STPS1545CG-TR and DSTB2045C are ROHS3 compliant, matching the original MBRB1545CT-T specification. All three parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage is specified at particular current levels. MBRB1545CT-T specifies 700 mV at 7.5 A, STPS1545CG-TR specifies 570 mV at 7.5 A, and DSTB2045C specifies 580 mV at 10 A. Lower forward voltage reduces power dissipation and heat generation. Circuit designs with thermal or efficiency constraints may benefit from the lower forward voltage of the substitute parts.

Q: What does reverse leakage current indicate?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. MBRB1545CT-T and STPS1545CG-TR specify 100 µA at 45 V, while DSTB2045C specifies 2 mA at 45 V. Higher leakage current increases standby power consumption. Applications sensitive to leakage current should prioritize STPS1545CG-TR or the original MBRB1545CT-T.

Q: Can these parts be used interchangeably in high-temperature applications?

A: Operating temperature ranges differ. MBRB1545CT-T and DSTB2045C specify -55 to 150 °C or -65 to 150 °C junction temperature ranges. STPS1545CG-TR specifies 175 °C maximum junction temperature. For applications approaching or exceeding 150 °C, STPS1545CG-TR provides additional thermal margin.

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