MBR3045CT-G1 Equivalent & Substitute Parts

Part Overview

The MBR3045CT-G1 is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and qualified to AEC-Q101 automotive standards. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MBR3045CT-G1 is determined by the following critical parameters:

Primary Matching Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage rating: 45 V DC reverse
Current rating: 15 A average rectified per diode
Package: TO-220-3 through-hole
Speed: Fast Recovery ≤ 500ns, > 200mA

Secondary Compatibility Factors:

Forward voltage drop (Vf) at rated current
Reverse leakage current
Operating temperature range
RoHS and regulatory compliance

Substitute parts are grouped into two categories based on current rating alignment:

Category 1: Direct Current Rating Match (15 A) Parts with 15 A average rectified current per diode provide pin-for-pin electrical equivalence with identical current handling capacity.

Category 2: Higher Current Rating (30 A) Parts with 30 A average rectified current per diode are electrically compatible for applications where the MBR3045CT-G1 operates below maximum current specifications, offering design margin and thermal performance benefits.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status
MBR3045CT-G1	Diodes Incorporated	45 V	15 A	620 mV @ 15 A	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Obsolete
DSA30C45PB	IXYS	45 V	15 A	750 mV @ 15 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSB30C45PB	IXYS	45 V	15 A	590 mV @ 15 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK28-0045A	IXYS	45 V	15 A	670 mV @ 15 A	500 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSA20C45PB	IXYS	45 V	10 A	750 mV @ 10 A	200 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSSK20-0045B	IXYS	45 V	10 A	510 mV @ 10 A	5 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK20-0045A	IXYS	45 V	10 A	680 mV @ 10 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DST2045C	Littelfuse Inc.	45 V	10 A	580 mV @ 10 A	2 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
STPS2045CT	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSA60C45PB	IXYS	45 V	30 A	790 mV @ 30 A	900 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSB60C45PB	IXYS	45 V	30 A	630 mV @ 30 A	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active

Engineering Selection Recommendations

Direct Replacement (15 A Current Rating):

The following parts provide electrical equivalence with matching 15 A current specifications and are recommended as primary substitutes:

DSB30C45PB (IXYS): Active product status with forward voltage of 590 mV @ 15 A, matching the original specification closely. Operating temperature range -55°C ~ 150°C aligns with the MBR3045CT-G1. RoHS3 compliant.
DSA30C45PB (IXYS): Active product with extended operating temperature to 175°C. Forward voltage 750 mV @ 15 A. RoHS3 compliant. Higher reverse leakage (300 µA) requires thermal evaluation in sensitive applications.
DSSK28-0045A (IXYS): Active product with extended operating temperature to 175°C. Forward voltage 670 mV @ 15 A. RoHS3 compliant. Moderate reverse leakage (500 µA).

Alternative Substitutes (10 A Current Rating):

The following parts are electrically compatible for applications where the MBR3045CT-G1 operates below 15 A maximum current:

STPS2045CT (STMicroelectronics): Active product with 25,100 units in stock. Forward voltage 570 mV @ 10 A. Extended operating temperature to 175°C. RoHS3 compliant. Reverse leakage 100 µA matches the original specification.
DSSK20-0045B (IXYS): Active product with 2,000 units in stock. Forward voltage 510 mV @ 10 A. Operating temperature -55°C ~ 150°C. RoHS3 compliant. Low reverse leakage (5 mA).
DST2045C (Littelfuse Inc.): Active product with 946 units in stock. Forward voltage 580 mV @ 10 A. Operating temperature -55°C ~ 150°C. RoHS3 compliant. Very low reverse leakage (2 mA).

Higher Current Capacity (30 A Current Rating):

The following parts provide increased current handling for applications requiring design margin:

DSB60C45PB (IXYS): Active product with forward voltage 630 mV @ 30 A, closely matching the original 620 mV specification. Operating temperature -55°C ~ 150°C. RoHS3 compliant. Low reverse leakage (10 mA).
DSA60C45PB (IXYS): Active product with extended operating temperature to 175°C. Forward voltage 790 mV @ 30 A. RoHS3 compliant.

All recommended substitutes maintain TO-220-3 through-hole packaging, 45 V reverse voltage rating, fast recovery Schottky technology, and RoHS compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 10 A rated diode as a substitute for the 15 A MBR3045CT-G1?

A: Yes, if your application operates at or below 10 A per diode. The 10 A parts (STPS2045CT, DSSK20-0045B, DST2045C) are electrically compatible with identical voltage ratings and package. Verify that your circuit current does not exceed the substitute part's 10 A specification.

Q: What is the difference between DSB30C45PB and DSA30C45PB?

A: Both are 15 A, 45 V Schottky diode arrays in TO-220-3 packaging from IXYS. DSB30C45PB has forward voltage of 590 mV @ 15 A and operating temperature -55°C ~ 150°C. DSA30C45PB has forward voltage of 750 mV @ 15 A and extended operating temperature to 175°C. DSB30C45PB is closer to the original MBR3045CT-G1 forward voltage specification.

Q: Can I use a 30 A rated diode instead of the 15 A MBR3045CT-G1?

A: Yes. The 30 A parts (DSB60C45PB, DSA60C45PB) are electrically compatible and provide increased current capacity. They maintain the same 45 V voltage rating, TO-220-3 package, and Schottky technology. This substitution is suitable when additional thermal margin or current headroom is beneficial.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts listed are RoHS3 compliant. The original MBR3045CT-G1 is RoHS compliant. All substitutes meet current regulatory requirements.

Q: What is the significance of forward voltage (Vf) differences between substitutes?

A: Forward voltage affects power dissipation and thermal performance. Lower Vf reduces heat generation. DSB30C45PB (590 mV) and DSSK20-0045B (510 mV) have lower forward voltages than DSA30C45PB (750 mV). For high-current applications, lower Vf substitutes reduce thermal load on the device and PCB.

Q: Does the operating temperature range affect substitution suitability?

A: Yes, for applications operating near temperature extremes. The MBR3045CT-G1 operates -55°C ~ 150°C. Substitutes with extended range to 175°C (DSA30C45PB, DSSK28-0045A, STPS2045CT, DSA60C45PB) provide additional margin for high-temperature environments. Substitutes with matching -55°C ~ 150°C range (DSB30C45PB, DSSK20-0045B, DST2045C, DSB60C45PB) are directly equivalent for temperature specifications.

Q: What is reverse leakage current and why does it vary among substitutes?

A: Reverse leakage is the small current flowing through the diode when reverse biased. Higher leakage increases power dissipation and heat generation. The MBR3045CT-G1 has 100 µA @ 45 V. Substitutes range from 2 µA (DST2045C) to 900 µA (DSA60C45PB). For precision analog circuits or high-impedance applications, lower leakage parts are preferred.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All recommended substitutes use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility with the original MBR3045CT-G1 PCB layout and mounting.

Q: Which substitute has the best overall compatibility with MBR3045CT-G1?

A: DSB30C45PB offers the closest electrical match: 15 A current rating, 590 mV forward voltage (vs. 620 mV original), matching -55°C ~ 150°C operating temperature, and low reverse leakage. It is an active product with 6,300 units in stock and RoHS3 compliant.

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