MBR4045WTG Equivalent & Substitute Parts

Part Overview

The MBR4045WTG 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 20 A per diode. The device is packaged in TO-247-3 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 active equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	MBR4045WTG
Manufacturer	onsemi
Category	Diodes, Rectifiers
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	20 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-247-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR4045WTG is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-247-3

Current Rating Considerations: Substitute parts are grouped by average rectified current capacity. The MBR4045WTG operates at 20 A per diode. Substitutes with equal or higher current ratings (15 A, 30 A, 40 A) are electrically compatible, as they meet or exceed the voltage and current requirements. Parts with lower current ratings are not suitable.

Forward Voltage Characteristics: Forward voltage drop varies across substitute options. Parts with lower forward voltage (500-620 mV) offer improved efficiency, while parts with higher forward voltage (700-800 mV) remain functionally compatible within the 45 V reverse voltage specification.

Reverse Leakage Current: Reverse leakage varies from 1 mA to 680 µA across substitutes. Higher leakage values indicate different semiconductor processing but remain within acceptable operating parameters for Schottky diode arrays.

Temperature Range: The MBR4045WTG operates from -65°C to 175°C. Substitute parts operate from -55°C to 175°C or -55°C to 150°C. The narrower lower temperature limit in substitutes does not restrict functionality in most applications.

Parameter Comparison

Part Number	Manufacturer	Io (A)	Vf (Max) @ If (mV)	Vr (Max) (V)	Ir @ Vr (mA)	Tj Range (°C)	Product Status
MBR4045WTG	onsemi	20	700 @ 20A	45	1 @ 45V	-65 ~ 175	Obsolete
DSA30C45HB	IXYS	15	740 @ 15A	45	0.25 @ 45V	-55 ~ 175	Active
DSA60C45HB	IXYS	30	770 @ 30A	45	0.45 @ 45V	-55 ~ 175	Active
DSA80C45HB	IXYS	40	780 @ 40A	45	0.68 @ 45V	-55 ~ 175	Active
DSB30C45HB	IXYS	15	580 @ 15A	45	10 @ 45V	-55 ~ 175	Active
DSB60C45HB	IXYS	30	620 @ 30A	45	10 @ 45V	-55 ~ 150	Active
DSB80C45HB	IXYS	40	620 @ 40A	45	15 @ 45V	-55 ~ 150	Active
DSSK60-0045A	IXYS	30	690 @ 30A	45	1 @ 45V	-55 ~ 175	Active
DSSK60-0045B	IXYS	30	500 @ 30A	45	20 @ 45V	-55 ~ 150	Active
DSSK80-0045B	IXYS	40	510 @ 40A	45	30 @ 45V	-55 ~ 150	Active
MBR4045PT-E3/45	Vishay General Semiconductor - Diodes Division	40	800 @ 40A	45	1 @ 45V	-65 ~ 150	Active

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

The DSSK60-0045A and DSSK60-0045B offer the closest electrical match to the MBR4045WTG. Both are IXYS Schottky diode arrays with 45 V reverse voltage rating and 30 A current capacity. DSSK60-0045A maintains the 1 mA reverse leakage characteristic of the original part and extends the operating temperature range to 175°C, making it the preferred substitute for applications requiring extended temperature operation. DSSK60-0045B provides superior forward voltage characteristics (500 mV) at the cost of higher reverse leakage (20 mA) and reduced maximum junction temperature (150°C).

Higher Current Capacity Alternatives:

The DSA80C45HB and DSSK80-0045B provide 40 A current capacity, exceeding the MBR4045WTG specification. These parts are suitable for applications where current headroom is required. The DSA80C45HB maintains low reverse leakage (0.68 mA) and operates to 175°C. The DSSK80-0045B offers lower forward voltage (510 mV) but operates only to 150°C and exhibits higher reverse leakage (30 mA).

Lower Current Capacity Alternatives:

The DSA30C45HB and DSB30C45HB provide 15 A current capacity. These parts are suitable only for applications where the load current does not exceed 15 A per diode. The DSB30C45HB offers significantly lower forward voltage (580 mV) compared to the original part.

Compliance and Status Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory status of the MBR4045WTG. All substitute parts are classified as active products, ensuring ongoing availability and supply chain continuity. The MBR4045PT-E3/45 from Vishay is an active alternative with 40 A capacity and maintains the lower temperature limit of -65°C, though it is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the MBR4045WTG?

A: Yes. Substitute parts with equal or higher current ratings (30 A or 40 A) are electrically compatible with the MBR4045WTG. The higher current capacity does not degrade performance in applications designed for 20 A operation. Parts with lower current ratings (15 A) are not suitable.

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

A: Forward voltage drop directly affects power dissipation and thermal performance. Parts with lower forward voltage (500-620 mV) generate less heat than the original MBR4045WTG (700 mV). Parts with higher forward voltage (740-800 mV) generate more heat. Selection depends on thermal design requirements and power budget constraints.

Q: Are all substitute parts pin-compatible with the MBR4045WTG?

A: All listed substitute parts use the TO-247-3 package configuration with through-hole mounting. Pin compatibility is maintained across all substitutes. The MBR4045PT-E3/45 uses TO-3P-3 (SC-65-3) package designation, which is mechanically equivalent to TO-247-3.

Q: Why do some substitute parts have different temperature ranges?

A: Operating temperature range reflects semiconductor processing and design specifications. The MBR4045WTG operates from -65°C to 175°C. Most IXYS substitutes operate from -55°C to 175°C or -55°C to 150°C. The narrower lower temperature limit does not restrict functionality in applications operating above -55°C.

Q: What is the difference between DSA and DSB series parts?

A: Both DSA and DSB series are IXYS Schottky diode arrays with identical voltage and current ratings. The primary difference is forward voltage characteristics. DSB series parts exhibit lower forward voltage (580-620 mV) compared to DSA series (740-780 mV), resulting in reduced power dissipation and improved efficiency.

Q: How do reverse leakage current differences affect circuit performance?

A: Reverse leakage current ranges from 1 mA to 30 mA across substitute options. Higher leakage increases standby power consumption and heat generation. Applications with stringent leakage requirements should select parts with lower reverse leakage (1 mA or 0.25-0.68 mA range).

Q: Is the MBR4045PT-E3/45 a suitable replacement despite RoHS non-compliance?

A: The MBR4045PT-E3/45 is electrically compatible and maintains the -65°C lower temperature limit. However, RoHS non-compliance may restrict use in applications subject to RoHS regulations. All IXYS substitutes are ROHS3 compliant and are preferred for regulated applications.

Q: Can I substitute a 15 A rated part for the 20 A MBR4045WTG?

A: No. The DSA30C45HB and DSB30C45HB are rated for 15 A maximum current. Using these parts in applications requiring 20 A operation will result in device overstress and potential failure. Current rating must equal or exceed the application requirement.

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