MBRS3045CTHMNG Equivalent & Substitute Parts

Part Overview

The MBRS3045CTHMNG is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common cathode with a maximum reverse voltage of 45V and average rectified current of 30A per diode. The device is packaged in TO-263-3 (D2PAK) surface mount configuration and is qualified to AEC-Q101 automotive standards. This part is currently active in production.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers offering equivalent electrical and mechanical characteristics.

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)	30	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 30 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBRS3045CTHMNG is determined by the following critical parameters:

Mandatory Matching Parameters:

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

Current Rating Consideration: The MBRS3045CTHMNG is rated for 30A average rectified current per diode. Substitute parts are grouped into two categories:

Direct Current Rating Equivalents (30A): Parts with identical 30A current rating provide direct functional replacement without circuit redesign.
Reduced Current Rating Alternatives (7.5A to 20A): Parts with lower current ratings (STPS1545CG-TR at 7.5A, STPS2045CG-TR at 10A, STPS20L45CG-TR at 10A, STPS2545CG-TR at 12.5A, MBRB2545CTT4G at 15A, SBRB2545CTG at 15A, STPS3045CG-TR at 15A, STPS3045CGY-TR at 15A, NRVBB40L45CTT4G at 20A) are suitable only when circuit design permits operation at the lower current specification.

All substitute parts maintain the 45V reverse voltage rating, Schottky technology, fast recovery speed characteristic, and TO-263-3 D2PAK surface mount package.

Parameter Comparison

Part Number	Manufacturer	Io (A)	Vr (V)	Vf (Max) @ If	Tj (°C)	Product Status	AEC-Q101
MBRS3045CTHMNG	Taiwan Semiconductor	30	45	900 mV @ 30 A	-55 to 150	Active	Yes
MBRB2545CTT4G	onsemi	15	45	820 mV @ 30 A	-65 to 175	Active	No
MBRB3045CT-1G	onsemi	15	45	620 mV @ 15 A	-65 to 175	Obsolete	No
NRVBB40L45CTT4G	onsemi	20	45	500 mV @ 20 A	-65 to 175	Active	Yes
SBRB2545CTG	onsemi	15	45	620 mV @ 15 A	-65 to 175	Obsolete	No
STPS1545CG-TR	STMicroelectronics	7.5	45	570 mV @ 7.5 A	-55 to 175	Active	No
STPS2045CG-TR	STMicroelectronics	10	45	570 mV @ 10 A	-55 to 175	Active	No
STPS20L45CG-TR	STMicroelectronics	10	45	550 mV @ 10 A	-55 to 150	Active	No
STPS2545CG-TR	STMicroelectronics	12.5	45	570 mV @ 12.5 A	-55 to 175	Active	No
STPS3045CG-TR	STMicroelectronics	15	45	570 mV @ 15 A	-55 to 200	Active	No
STPS3045CGY-TR	STMicroelectronics	15	45	570 mV @ 15 A	-55 to 200	Active	Yes

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

When AEC-Q101 qualification is mandatory, the MBRS3045CTHMNG (original part) and STPS3045CGY-TR are the only options from the provided substitute list. The STPS3045CGY-TR is manufactured by STMicroelectronics, carries AEC-Q101 qualification, and is in active production status. However, the STPS3045CGY-TR is rated for 15A average rectified current, which is 50% of the original 30A specification. This part is suitable only if circuit design permits operation at the reduced current rating.

The NRVBB40L45CTT4G, also AEC-Q101 qualified and in active production, provides 20A current rating and represents an intermediate option between the original 30A specification and the 15A alternatives.

For Non-Automotive Applications:

When AEC-Q101 qualification is not required, multiple active production alternatives are available from STMicroelectronics and onsemi. The MBRB2545CTT4G (onsemi, 15A, active) and STPS3045CG-TR (STMicroelectronics, 15A, active) offer the highest current ratings among non-qualified alternatives.

Obsolete Parts:

The MBRB3045CT-1G and SBRB2545CTG are marked as obsolete and should not be selected for new designs or long-term production applications.

Current Rating Derating:

Parts with current ratings below 30A require circuit analysis to confirm adequate thermal and electrical performance. Forward voltage characteristics vary across the substitute list, ranging from 500 mV to 900 mV at rated current, which affects power dissipation calculations.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower current rating than the original MBRS3045CTHMNG?

A: Substitution with lower current ratings is possible only if your circuit design operates below the substitute part's current specification. The MBRS3045CTHMNG is rated for 30A per diode. Substitute parts range from 7.5A to 20A. Circuit analysis must confirm that actual operating current does not exceed the substitute part's rating. Using a part rated below actual circuit current will result in thermal stress and premature failure.

Q: What is the difference between STPS3045CG-TR and STPS3045CGY-TR?

A: Both parts are manufactured by STMicroelectronics with identical electrical specifications: 45V reverse voltage, 15A average rectified current, and TO-263-3 D2PAK package. The primary difference is that STPS3045CGY-TR carries AEC-Q101 automotive qualification, while STPS3045CG-TR does not. Both are in active production status. Selection depends on whether automotive qualification is required for your application.

Q: Why is the MBRB3045CT-1G listed as a substitute if it is obsolete?

A: The MBRB3045CT-1G is included in the substitute list because it was originally specified as an equivalent part. However, its obsolete status means it is no longer in active production. New designs should not incorporate this part. Existing designs using this part should transition to active production alternatives such as STPS3045CGY-TR or NRVBB40L45CTT4G.

Q: Are all substitute parts in the same package as the original MBRS3045CTHMNG?

A: Yes. All substitute parts listed are packaged in TO-263-3, D2PAK (2 Leads + Tab), TO-263AB surface mount configuration, which is identical to the original MBRS3045CTHMNG. This ensures mechanical and thermal compatibility on the printed circuit board without layout modifications.

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

A: Forward voltage affects power dissipation in the diode. The MBRS3045CTHMNG specifies 900 mV at 30A, while substitute parts range from 500 mV to 820 mV at their respective rated currents. Lower forward voltage reduces heat generation. When selecting a substitute, calculate power dissipation (P = Vf × I) for your actual operating current to ensure thermal management remains adequate.

Q: Can I use NRVBB40L45CTT4G as a direct replacement for MBRS3045CTHMNG?

A: The NRVBB40L45CTT4G is mechanically and electrically compatible in terms of package, reverse voltage, and Schottky technology. However, it is rated for 20A average rectified current compared to the original 30A specification. If your circuit operates at or below 20A, this part is suitable. The NRVBB40L45CTT4G also carries AEC-Q101 qualification and is in active production, making it a qualified alternative for automotive applications requiring reduced current capacity.

Q: What does RoHS3 compliance mean for these parts?

A: ROHS3 compliance indicates that the part meets Restriction of Hazardous Substances Directive requirements, specifically the exemptions and restrictions on lead, cadmium, mercury, and other hazardous materials. All parts listed, including the original MBRS3045CTHMNG and all substitutes, are ROHS3 compliant. This is a regulatory requirement for most commercial and industrial applications.

Q: Are there any temperature operating range differences I should consider?

A: Yes. The MBRS3045CTHMNG operates from -55°C to 150°C junction temperature. Most substitute parts extend the upper limit to 175°C or higher (STPS3045CG-TR and STPS3045CGY-TR reach 200°C). If your application requires operation at temperatures above 150°C, select a substitute with a higher maximum junction temperature rating. Conversely, if your application operates only within the -55°C to 150°C range, this difference is not a limiting factor.

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