MBRF2045CTH Equivalent & Substitute Parts

Part Overview

The MBRF2045CTH is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common cathode with 45 V reverse voltage rating and 20 A average rectified current per diode. The device is packaged in TO-220-3 with isolated tab (ITO-220AB) for through-hole mounting and meets automotive-grade AEC-Q101 qualification. 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	Unit
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	840 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack, Isolated Tab	—
Supplier Device Package	ITO-220AB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRF2045CTH is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 20 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-3 Full Pack, Isolated Tab
Supplier Device Package: ITO-220AB

Substitution Logic: Parts are grouped into two categories based on electrical parameter alignment:

Category 1 - Direct Parametric Equivalents: Parts matching or exceeding the 45 V reverse voltage and 20 A current specifications while maintaining identical package and configuration.

Category 2 - Similar Functional Alternatives: Parts with reduced current ratings (7.5 A to 15 A) or identical 20 A ratings but different voltage specifications. These are suitable only when application requirements permit lower current handling or when voltage derating is acceptable.

All substitute parts maintain Schottky technology, fast recovery speed (≤ 500ns), common cathode configuration, and TO-220-3 ITO-220AB packaging. Compliance with RoHS3 and automotive qualification (AEC-Q101) is preserved across active-status alternatives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io per Diode [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj Range [°C]	Product Status	AEC-Q101	RoHS3
MBRF2045CTH	Taiwan Semiconductor Corporation	45	20	840 @ 20 A	100 @ 45 V	-55 to 150	Discontinued	Yes	Yes
MBRF2045CT	Diodes Incorporated	60	10	640 @ 10 A	100 @ 60 V	-55 to 150	Obsolete	Yes	Yes
MBRF1545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	7.5	570 @ 7.5 A	100 @ 45 V	-65 to 150	Active	No	Yes
MBRF1545CTHE3/45	Vishay General Semiconductor - Diodes Division	45	7.5	570 @ 7.5 A	100 @ 45 V	-65 to 150	Active	Yes	Yes
MBRF2045CT-E3/45	Vishay General Semiconductor - Diodes Division	45	10	650 @ 10 A	100 @ 45 V	-65 to 150	Active	No	Yes
MBRF2045CTHE3/45	Vishay General Semiconductor - Diodes Division	45	10	650 @ 10 A	100 @ 45 V	-65 to 150	Active	Yes	Yes
MBRF2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45	12.5	820 @ 30 A	200 @ 45 V	-65 to 150	Active	No	Yes
MBRF2545CT/45	Vishay General Semiconductor - Diodes Division	45	12.5	Not Specified	200 @ 45 V	-65 to 150	Active	No	No
MBRF30H45CT-E3/45	Vishay General Semiconductor - Diodes Division	45	15	620 @ 15 A	80 @ 45 V	-65 to 175	Active	No	Yes
MBRF30H45CTHE3/45	Vishay General Semiconductor - Diodes Division	45	15	620 @ 15 A	80 @ 45 V	-65 to 175	Active	Yes	Yes
VFT1045C-M3/4W	Vishay General Semiconductor - Diodes Division	45	5	580 @ 5 A	500 @ 45 V	-40 to 150	Active	No	Yes

Engineering Selection Recommendations

For Direct Replacement (Matching 20 A Current Specification):

No active substitute parts are available that match both the 45 V reverse voltage and 20 A average rectified current specifications of the MBRF2045CTH. The MBRF2045CT from Diodes Incorporated provides higher voltage rating (60 V) but reduced current capacity (10 A), making it unsuitable for applications requiring the full 20 A specification.

For Reduced Current Applications (≤ 15 A):

The following active-status parts from Vishay General Semiconductor - Diodes Division are suitable when application requirements permit current derating:

MBRF30H45CTHE3/45 (15 A): Maintains 45 V rating with AEC-Q101 qualification, RoHS3 compliance, and extended junction temperature range (-65°C to 175°C). Recommended for automotive applications requiring full qualification.
MBRF2045CTHE3/45 (10 A): Maintains 45 V rating with AEC-Q101 qualification and RoHS3 compliance. Suitable for applications with 10 A maximum current requirement.
MBRF1545CTHE3/45 (7.5 A): Maintains 45 V rating with AEC-Q101 qualification and RoHS3 compliance. Suitable for applications with 7.5 A maximum current requirement.

For Non-Automotive Applications:

MBRF2045CT-E3/45 (10 A): Active status, RoHS3 compliant, 45 V rating. Lacks AEC-Q101 qualification.
MBRF2545CT-E3/45 (12.5 A): Active status, RoHS3 compliant, 45 V rating. Lacks AEC-Q101 qualification.

Compliance Considerations:

All recommended active substitutes maintain RoHS3 compliance and TO-220-3 ITO-220AB packaging. Parts designated with "E3/45" suffix include AEC-Q101 automotive qualification. Parts without this suffix are suitable only for non-automotive applications.

Frequently Asked Questions (FAQ)

Q: Can MBRF2045CT from Diodes Incorporated directly replace MBRF2045CTH?

A: No. While both are Schottky diode arrays in TO-220-3 ITO-220AB packaging with common cathode configuration, the MBRF2045CT has a 60 V reverse voltage rating and 10 A current specification, compared to the MBRF2045CTH's 45 V and 20 A. The reduced current capacity makes it unsuitable for applications requiring 20 A operation.

Q: What is the primary limitation when substituting the MBRF2045CTH?

A: The MBRF2045CTH combines 45 V reverse voltage with 20 A average rectified current per diode. No active substitute parts currently available match both specifications simultaneously. Substitution requires either accepting reduced current capacity (7.5 A to 15 A) or higher voltage ratings with lower current.

Q: Are Vishay MBRF30H45CTHE3/45 and MBRF2045CTHE3/45 suitable for automotive applications?

A: Yes. Both parts carry AEC-Q101 automotive qualification and RoHS3 compliance. The MBRF30H45CTHE3/45 provides 15 A capacity, while MBRF2045CTHE3/45 provides 10 A capacity. Selection depends on application current requirements.

Q: What is the difference between MBRF2045CT-E3/45 and MBRF2045CTHE3/45?

A: Both parts have identical electrical specifications (45 V, 10 A, Schottky, common cathode, TO-220-3 ITO-220AB). The MBRF2045CTHE3/45 includes AEC-Q101 automotive qualification, while MBRF2045CT-E3/45 does not. For automotive applications, MBRF2045CTHE3/45 is required.

Q: Can VFT1045C-M3/4W replace MBRF2045CTH?

A: No. The VFT1045C-M3/4W is rated for only 5 A average rectified current, significantly below the MBRF2045CTH's 20 A specification. Additionally, it lacks AEC-Q101 qualification and has a narrower operating temperature range (-40°C to 150°C versus -55°C to 150°C).

Q: What packaging considerations apply to these substitutes?

A: All listed substitute parts maintain the TO-220-3 Full Pack with isolated tab (ITO-220AB) configuration, ensuring mechanical and thermal compatibility with the MBRF2045CTH. Through-hole mounting characteristics remain identical.

Q: Why is MBRF2545CT/45 not recommended despite matching voltage and configuration?

A: MBRF2545CT/45 is RoHS non-compliant, whereas MBRF2045CTH is RoHS3 compliant. For applications subject to RoHS requirements, this part is unsuitable. Additionally, it lacks AEC-Q101 qualification.

Q: What is the significance of the "H" designation in MBRF30H45CT-E3/45?

A: The "H" in the part number indicates a specific variant within the MBRF30 series. MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45 are functionally equivalent 15 A devices at 45 V. The difference is that MBRF30H45CTHE3/45 includes AEC-Q101 qualification.

Q: Are there current rating trade-offs when substituting?

A: Yes. Direct voltage and configuration matches are available only at reduced current ratings (7.5 A to 15 A). Applications requiring the full 20 A specification have no active substitute maintaining identical electrical parameters. Circuit redesign or alternative component families may be necessary.

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