MBR3045ST Equivalent & Substitute Parts

Part Overview

The MBR3045ST is a Schottky diode array manufactured by onsemi, 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 configuration and operates across a junction temperature range of -65°C to 175°C. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

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	620 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MBR3045ST is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage rating: 45 V DC reverse maximum
Current rating: 15 A average rectified per diode
Speed classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting type: Through Hole
Package: TO-220-3

Direct Equivalents maintain all primary criteria with identical or superior electrical performance characteristics. These parts are functionally interchangeable without circuit modification.

Similar Parts maintain the core electrical parameters (45 V, Schottky, 1 Pair Common Cathode, Fast Recovery, Through Hole) but may differ in current rating, forward voltage, or reverse leakage specifications. These parts are suitable for applications where the specific electrical variance is acceptable within circuit design margins.

Parametric Equivalents share the primary electrical specifications but employ different package configurations (surface mount versus through hole). These require PCB layout and assembly process modifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Mounting Type	Product Status	RoHS Status
MBR3045ST	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	TO-220-3	Through Hole	Obsolete	RoHS non-compliant
25CTQ045	Vishay General Semiconductor - Diodes Division	45 V	15 A	560 mV @ 15 A	1.75 mA @ 45 V	TO-220-3	Through Hole	Obsolete	RoHS non-compliant
MBR3045CTP	Diodes Incorporated	45 V	15 A	650 mV @ 15 A	200 µA @ 45 V	TO-220-3 Isolated Tab	Through Hole	Obsolete	ROHS3 Compliant
SBR3045CT	Diodes Incorporated	45 V	15 A	550 mV @ 15 A	500 µA @ 45 V	TO-220-3	Through Hole	Active	ROHS3 Compliant
STPS3045CT	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	TO-220-3	Through Hole	Active	ROHS3 Compliant
DST2045C	Littelfuse Inc.	45 V	10 A	580 mV @ 10 A	2 mA @ 45 V	TO-220-3	Through Hole	Active	ROHS3 Compliant
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	TO-220-3	Through Hole	Active	ROHS3 Compliant
VS-30CTQ045-M3	Vishay General Semiconductor - Diodes Division	45 V	30 A	760 mV @ 30 A	2 mA @ 45 V	TO-220-3	Through Hole	Active	ROHS3 Compliant
25CTQ045-1	SMC Diode Solutions	45 V	Not specified	710 mV @ 15 A	1 mA @ 45 V	TO-262-3 Long Leads, I2PAK, TO-262AA	Through Hole	Active	ROHS3 Compliant
30CTQ045	Diotec Semiconductor	45 V	15 A	620 mV @ 15 A	50 µA @ 45 V	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	Surface Mount	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Functionally Equivalent):

The following parts maintain identical electrical specifications and through-hole TO-220-3 packaging, providing direct substitution capability:

STPS3045CT (STMicroelectronics): Active product status with ROHS3 compliance. Forward voltage of 570 mV @ 15 A is within acceptable variance. Reverse leakage matches the original specification at 200 µA @ 45 V.
SBR3045CT (Diodes Incorporated): Active product status with ROHS3 compliance. Super Barrier technology provides superior forward voltage performance at 550 mV @ 15 A. Reverse leakage of 500 µA @ 45 V is elevated but within operational tolerance for most applications.

Recommended Substitutes (Active Product Status):

For new designs and procurement requiring active product availability:

STPS3045CT is the primary recommendation due to active product status, ROHS3 compliance, and electrical characteristics closely matching the original MBR3045ST specification.
SBR3045CT provides an alternative with improved forward voltage characteristics and active availability, suitable for applications prioritizing efficiency.

Higher Current Capability:

STPS40L45CT (STMicroelectronics): 20 A per diode rating with superior forward voltage of 530 mV @ 20 A. Suitable for applications requiring increased current margin or higher power dissipation tolerance.
VS-30CTQ045-M3 (Vishay): 30 A per diode rating. Appropriate for applications requiring significant current headroom beyond the original 15 A specification.

Lower Current Capability:

DST2045C (Littelfuse Inc.): 10 A per diode rating. Suitable only for applications where the original 15 A specification exceeds actual circuit requirements.

Surface Mount Alternative:

30CTQ045 (Diotec Semiconductor): Maintains 15 A rating and 45 V specification with superior reverse leakage of 50 µA @ 45 V. Requires PCB redesign for TO-263-3 D2PAK surface mount configuration.

Compliance Considerations:

The original MBR3045ST is RoHS non-compliant. All recommended active substitutes (STPS3045CT, SBR3045CT, STPS40L45CT, VS-30CTQ045-M3) are ROHS3 compliant, supporting transition to compliant supply chains.

Frequently Asked Questions (FAQ)

Q: Can STPS3045CT directly replace MBR3045ST without circuit modification?

A: Yes. STPS3045CT maintains identical electrical specifications (45 V, 15 A, Schottky, Fast Recovery) and TO-220-3 through-hole packaging. The forward voltage of 570 mV @ 15 A is within acceptable variance of the original 620 mV specification. No circuit modification is required.

Q: What is the difference between the MBR3045ST and SBR3045CT?

A: Both devices share identical voltage (45 V), current (15 A), and package specifications. The primary difference is technology: MBR3045ST uses Schottky technology while SBR3045CT uses Super Barrier technology. SBR3045CT provides superior forward voltage performance (550 mV vs. 620 mV @ 15 A), resulting in lower power dissipation. SBR3045CT is active and ROHS3 compliant.

Q: Why is the reverse leakage specification different between 25CTQ045 and MBR3045ST?

A: Both parts maintain 45 V and 15 A specifications but employ different manufacturing processes. The 25CTQ045 exhibits higher reverse leakage (1.75 mA @ 45 V) compared to MBR3045ST (200 µA @ 45 V). This difference affects thermal performance and standby power consumption. Selection depends on application sensitivity to leakage current.

Q: Can I use STPS40L45CT (20 A) in place of MBR3045ST (15 A)?

A: Yes. STPS40L45CT maintains the 45 V voltage specification and TO-220-3 through-hole package. The higher 20 A current rating provides additional margin and does not create circuit incompatibility. The superior forward voltage (530 mV @ 20 A) reduces power dissipation. This substitution is suitable for applications where increased current capability is beneficial or neutral.

Q: Is 30CTQ045 (Diotec) a suitable replacement for MBR3045ST?

A: 30CTQ045 maintains identical electrical specifications (45 V, 15 A, Schottky, Fast Recovery) and provides superior reverse leakage performance (50 µA @ 45 V). However, it employs TO-263-3 D2PAK surface mount packaging instead of through-hole TO-220-3. This substitution requires PCB redesign and assembly process modification. It is suitable only for new designs or major PCB revisions.

Q: What is the operating temperature difference between MBR3045ST and STPS3045CT?

A: MBR3045ST operates from -65°C to 175°C junction temperature. STPS3045CT specifies a maximum junction temperature of 200°C without a minimum temperature specification in the provided data. For applications operating at the lower temperature extreme (-65°C), verify STPS3045CT minimum operating temperature with the manufacturer.

Q: Can I use DST2045C (10 A) as a substitute for MBR3045ST (15 A)?

A: DST2045C maintains the 45 V voltage specification and TO-220-3 through-hole package but is rated for only 10 A average rectified current. This substitution is suitable only for applications where actual circuit current requirements do not exceed 10 A. If the original design requires 15 A capability, DST2045C is not appropriate.

Q: What is the difference between MBR3045CTP and MBR3045ST?

A: Both parts are manufactured by onsemi and Diodes Incorporated respectively, with identical 45 V, 15 A, Schottky specifications. MBR3045CTP features an isolated tab in TO-220-3 Isolated Tab packaging, compared to standard TO-220-3 for MBR3045ST. The isolated tab provides electrical isolation of the tab from the die, beneficial for applications requiring thermal management without electrical connection. MBR3045CTP is ROHS3 compliant.

Q: Why would I choose VS-30CTQ045-M3 (30 A) over STPS3045CT (15 A)?

A: VS-30CTQ045-M3 provides 30 A per diode capability, double the original specification. This selection is appropriate for applications requiring significant current margin, experiencing thermal stress at 15 A, or designed for future current expansion. The trade-off is higher forward voltage (760 mV @ 30 A) and increased reverse leakage (2 mA @ 45 V), resulting in higher power dissipation.

Q: Is 25CTQ045-1 (SMC Diode Solutions) compatible with MBR3045ST?

A: 25CTQ045-1 maintains the 45 V voltage specification and through-hole mounting type. However, it employs TO-262-3 Long Leads (I2PAK) packaging instead of TO-220-3, requiring PCB redesign. The forward voltage specification of 710 mV @ 15 A is elevated compared to MBR3045ST (620 mV). This substitution is suitable only for new designs where TO-262-3 packaging is acceptable.

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