MBR3045CTH Equivalent & Substitute Parts

Part Overview

The MBR3045CTH is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common cathode with 45 V reverse voltage rating and 30 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 discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

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)	30 A
Voltage - Forward (Vf) (Max) @ If	820 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the MBR3045CTH is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Diode configuration: 1 pair common cathode
Technology: Schottky
Reverse voltage rating: 45 V
Average rectified current: 30 A per diode
Speed classification: Fast recovery ≤ 500ns, > 200mA
Mounting type: Through hole
Package: TO-220-3 or compatible footprint

Secondary Compatibility Factors:

Forward voltage characteristics within specified operating conditions
Reverse leakage current specifications
Operating temperature range
RoHS and regulatory compliance status

Parts are grouped into two categories: Parametric Equivalents (matching all primary criteria with identical current ratings) and Similar Parts (matching primary criteria but with reduced current ratings or package variations). Similar parts function as substitutes only when circuit design permits operation at lower current levels or alternative package geometries.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Speed	Ir @ Vr	Tj (Operating)	Package	Product Status
MBR3045CTH	Taiwan Semiconductor Corporation	45 V	30 A	820 mV @ 30 A	Fast Recovery ≤ 500ns, > 200mA	200 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Discontinued
MBR3045CT	Good-Ark Semiconductor	45 V	30 mA	Not specified	Small Signal ≤ 200mA	200 nA @ 45 V	Not specified	TO-220-3	Active
MBR3045PT	Solid State Inc.	45 V	30 A	Not specified	Fast Recovery ≤ 500ns, > 200mA	Not specified	Not specified	TO-247-3	Active
DSB60C45PB	IXYS	45 V	30 A	630 mV @ 30 A	Fast Recovery ≤ 500ns, > 200mA	10 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	570 mV @ 7.5 A	Fast Recovery ≤ 500ns, > 200mA	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
MBR2045CT-LJ-01	Diodes Incorporated	45 V	10 A	640 mV @ 10 A	Fast Recovery ≤ 500ns, > 200mA	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	15 A	820 mV @ 30 A	Fast Recovery ≤ 500ns, > 200mA	200 µA @ 45 V	-65°C ~ 150°C	TO-220-3	Active
MBR3045CT-BP	Micro Commercial Co	45 V	15 A	700 mV @ 15 A	Fast Recovery ≤ 500ns, > 200mA	200 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
MBR3045CTE3/TU	Microchip Technology	45 V	15 A	700 mV @ 15 A	Fast Recovery ≤ 500ns, > 200mA	50 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
MBR3045FCTE3/TU	Microchip Technology	45 V	15 A	700 mV @ 15 A	Fast Recovery ≤ 500ns, > 200mA	50 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Active
VT1045C-M3/4W	Vishay General Semiconductor - Diodes Division	45 V	5 A	580 mV @ 5 A	Fast Recovery ≤ 500ns, > 200mA	500 µA @ 45 V	-40°C ~ 150°C	TO-220-3	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

The MBR3045PT (Solid State Inc.) is the only parametric equivalent matching the 30 A current rating and fast recovery speed classification. This part maintains identical electrical performance specifications for reverse voltage and current capacity. The primary distinction is package geometry: MBR3045PT uses TO-247-3 instead of TO-220-3. Direct PCB substitution requires mechanical redesign of the mounting footprint. This part is active and ROHS3 compliant.

Functional Substitutes (Same Voltage, Reduced Current):

The following parts maintain 45 V reverse voltage and fast recovery speed characteristics but operate at reduced current ratings:

MBR2545CT-E3/45 (Vishay): 15 A rating, TO-220-3 package, active status. Operating temperature range extends to -65°C ~ 150°C. Forward voltage specification matches the main part at 820 mV @ 30 A reference condition.
MBR3045CT-BP (Micro Commercial Co): 15 A rating, TO-220-3 package, active status. Forward voltage 700 mV @ 15 A. Maintains identical operating temperature range and reverse leakage specification as the main part.
MBR3045CTE3/TU and MBR3045FCTE3/TU (Microchip Technology): Both rated 15 A, TO-220-3 package, active status. Extended operating temperature range -65°C ~ 175°C. Reduced reverse leakage current (50 µA @ 45 V) compared to main part specification.
MBR2045CT-LJ-01 (Diodes Incorporated): 10 A rating, TO-220-3 package, active status. AEC-Q101 automotive qualified. Suitable for applications requiring lower current capacity.
MBR1545CT-E3/45 (Vishay): 7.5 A rating, TO-220-3 package, active status. Extended operating temperature range -65°C ~ 175°C.
VT1045C-M3/4W (Vishay): 5 A rating, TO-220-3 package, active status. Lowest current capacity in the substitute group.

Package Variant Consideration:

The MBR3045PT operates at full 30 A capacity but requires TO-247-3 footprint accommodation. This part is suitable only when PCB layout permits the larger package geometry.

Compliance Status:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. The MBR2045CT-LJ-01 carries AEC-Q101 automotive qualification matching the original part's grade specification.

Frequently Asked Questions (FAQ)

Q: Can MBR3045PT directly replace MBR3045CTH on the existing PCB?

A: MBR3045PT provides electrical equivalence at 30 A capacity and 45 V rating. However, the TO-247-3 package has different pin spacing and mounting hole dimensions compared to TO-220-3. Physical substitution requires PCB redesign or use of an adapter. Electrical performance is equivalent.

Q: What is the difference between the MBR3045CT (Good-Ark) and MBR3045CTH?

A: The Good-Ark MBR3045CT is rated for 30 mA average rectified current, not 30 A. This represents a 1000-fold reduction in current capacity and is not a functional substitute for the 30 A MBR3045CTH. The part number similarity is coincidental.

Q: Can I use MBR3045CT-BP (15 A) in place of MBR3045CTH (30 A)?

A: MBR3045CT-BP is a functional substitute only if circuit design permits operation at 15 A maximum current. The part maintains identical 45 V reverse voltage rating, fast recovery speed, and TO-220-3 package compatibility. Forward voltage is 700 mV @ 15 A compared to 820 mV @ 30 A for the original part. If the application requires 30 A capacity, this part is not suitable.

Q: Which substitute offers the best reverse leakage performance?

A: MBR3045CTE3/TU and MBR3045FCTE3/TU (both Microchip Technology) specify 50 µA @ 45 V reverse leakage, compared to 200 µA @ 45 V for the original MBR3045CTH. Both are rated 15 A and available in TO-220-3 package.

Q: Are all substitutes automotive qualified?

A: Only MBR2045CT-LJ-01 (Diodes Incorporated) carries explicit AEC-Q101 automotive qualification matching the original part's grade specification. Other substitutes do not list automotive qualification in provided specifications.

Q: What is the temperature range consideration for substitute selection?

A: The original MBR3045CTH operates -55°C ~ 150°C. Substitutes MBR1545CT-E3/45, MBR3045CTE3/TU, and MBR3045FCTE3/TU extend the upper limit to 175°C and lower limit to -65°C, providing wider operating margin. VT1045C-M3/4W has a narrower range (-40°C ~ 150°C) and may not be suitable for applications requiring -55°C operation.

Q: Can I use multiple lower-current parts in parallel to achieve 30 A capacity?

A: Parallel operation of Schottky diodes requires careful thermal and current-sharing analysis. This approach is not addressed in the provided specifications and falls outside the scope of direct substitution guidance.

Q: What packaging format should I specify when ordering substitutes?

A: All recommended substitutes use TO-220-3 through-hole package except MBR3045PT (TO-247-3). Verify PCB footprint compatibility before ordering. Packaging format (tube, bulk, or tray) does not affect electrical performance but may impact procurement lead time and cost.

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