MBRB1545CTTRR Equivalent & Substitute Parts

Part Overview

The MBRB1545CTTRR is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 7.5 A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount format with 2 leads plus tab.

The MBRB1545CTTRR is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and leverage active product lines with enhanced performance characteristics or compliance certifications.

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)	7.5	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 7.5 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
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	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRB1545CTTRR is determined by strict electrical and mechanical compatibility criteria. All substitute parts must satisfy the following requirements:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V (minimum)
Current - Average Rectified (Io) (per Diode): 7.5 A (minimum)
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB or equivalent

Substitution Categories:

Direct Equivalent (Same Current Rating): Parts rated at exactly 7.5 A average rectified current with 45 V reverse voltage rating, identical package, and common cathode configuration.

Upgrade Substitute (Higher Current Rating): Parts rated at 12.5 A or 15 A average rectified current with 45 V reverse voltage rating. These provide enhanced current handling capability while maintaining electrical and mechanical compatibility.

All substitute parts listed are active products with RoHS3 compliance, addressing the obsolescence and compliance limitations of the original MBRB1545CTTRR.

Parameter Comparison

Parameter	MBRB1545CTTRR (Vishay)	MBRB1545CTT4G (onsemi)	STPS1545CG-TR (STMicroelectronics)	STPS2545CGY-TR (STMicroelectronics)	STPS3045CG-TR (STMicroelectronics)	DSSK28-0045BS-TRL (IXYS)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	7.5 A	7.5 A	7.5 A	12.5 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 7.5 A	570 mV @ 7.5 A	570 mV @ 7.5 A	840 mV @ 25 A	570 mV @ 15 A	480 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	125 µA @ 45 V	200 µA @ 45 V	20 mA @ 45 V
Operating Temperature - Junction (Max)	150°C	175°C	175°C	175°C	200°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent Selection:

MBRB1545CTT4G (onsemi) and STPS1545CG-TR (STMicroelectronics) are direct electrical and mechanical equivalents to the MBRB1545CTTRR. Both parts maintain the 7.5 A current rating, 45 V reverse voltage specification, and TO-263-3 D2PAK package. Both are active products with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original part. MBRB1545CTT4G offers improved forward voltage characteristics (570 mV vs. 840 mV at 7.5 A) and extended maximum junction temperature (175°C vs. 150°C). STPS1545CG-TR provides identical electrical performance with maximum junction temperature of 175°C.

Upgrade Substitute Selection:

STPS2545CGY-TR (STMicroelectronics) provides a 12.5 A current rating upgrade while maintaining 45 V reverse voltage and TO-263-3 D2PAK package compatibility. This part includes AEC-Q101 automotive qualification and is suitable for applications requiring enhanced current capacity. Maximum junction temperature is 175°C.

STPS3045CG-TR (STMicroelectronics) and DSSK28-0045BS-TRL (IXYS) both provide 15 A current rating upgrades. STPS3045CG-TR offers superior forward voltage performance (570 mV @ 15 A) and maximum junction temperature of 200°C. DSSK28-0045BS-TRL provides the lowest forward voltage (480 mV @ 15 A) but exhibits higher reverse leakage current (20 mA vs. 100-200 µA).

All substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term supply availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MBRB1545CTT4G directly replace MBRB1545CTTRR without circuit modification?

A: Yes. MBRB1545CTT4G is a direct electrical and mechanical equivalent. Both parts feature identical diode configuration (1 Pair Common Cathode), Schottky technology, 45 V reverse voltage rating, 7.5 A average rectified current per diode, and TO-263-3 D2PAK package. The primary differences are improved forward voltage characteristics and extended maximum junction temperature in the onsemi part, which provide performance benefits without requiring circuit changes.

Q: What is the difference between direct equivalents and upgrade substitutes?

A: Direct equivalents (MBRB1545CTT4G, STPS1545CG-TR) maintain the exact 7.5 A current rating of the original MBRB1545CTTRR. Upgrade substitutes (STPS2545CGY-TR at 12.5 A, STPS3045CG-TR and DSSK28-0045BS-TRL at 15 A) provide higher current handling capability. All maintain the 45 V reverse voltage rating and TO-263-3 D2PAK package. Upgrade substitutes are suitable for applications where increased current capacity is beneficial or required.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (MBRB1545CTT4G, STPS1545CG-TR, STPS2545CGY-TR, STPS3045CG-TR, DSSK28-0045BS-TRL) are ROHS3 compliant. The original MBRB1545CTTRR is RoHS non-compliant. Substitution with any of these parts addresses regulatory compliance requirements for new designs and manufacturing processes.

Q: What is the significance of forward voltage differences among substitute parts?

A: Forward voltage (Vf) affects power dissipation and thermal performance. Lower forward voltage reduces heat generation. MBRB1545CTT4G and STPS1545CG-TR both specify 570 mV @ 7.5 A, compared to 840 mV for the original part, resulting in reduced power loss. STPS3045CG-TR specifies 570 mV @ 15 A, and DSSK28-0045BS-TRL specifies 480 mV @ 15 A. Selection depends on thermal budget and application requirements.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts use the TO-263-3 D2PAK (2 Leads + Tab) surface mount package, identical to the MBRB1545CTTRR. PCB footprints, solder reflow profiles, and thermal management approaches remain unchanged. Mechanical and thermal compatibility is maintained across all listed substitutes.

Q: What is the maximum junction temperature range for each substitute?

A: MBRB1545CTT4G and STPS1545CG-TR: 175°C maximum. STPS2545CGY-TR: 175°C maximum. STPS3045CG-TR: 200°C maximum. DSSK28-0045BS-TRL: 150°C maximum. The original MBRB1545CTTRR: 150°C maximum. Higher maximum junction temperatures provide improved thermal margin in high-temperature applications.

Q: Is STPS2545CGY-TR suitable for automotive applications?

A: Yes. STPS2545CGY-TR carries AEC-Q101 automotive qualification and is graded for automotive use. This part is suitable for automotive and industrial applications requiring enhanced current capacity (12.5 A) and automotive-grade reliability.

Q: What reverse leakage current differences exist among substitutes?

A: Reverse leakage current at 45 V varies: MBRB1545CTTRR and direct equivalents (MBRB1545CTT4G, STPS1545CG-TR) specify 100 µA. STPS2545CGY-TR specifies 125 µA. STPS3045CG-TR specifies 200 µA. DSSK28-0045BS-TRL specifies 20 mA. Lower reverse leakage is generally preferred for low-power applications and precision circuits. Selection depends on application sensitivity to leakage current.

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