MBRF2045CTG Equivalent & Substitute Parts

Part Overview

The MBRF2045CTG is a Schottky diode array manufactured by onsemi, configured as a 1 Pair Common Cathode with a maximum reverse voltage of 45 V and average rectified current of 10 A per diode. The device is housed in a TO-220-3 Full Pack through-hole package and features fast recovery characteristics suitable for switching applications. The MBRF2045CTG is classified 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)	10 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 10 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MBRF2045CTG 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 minimum
Current - Average Rectified (Io) (per Diode): 10 A minimum
Mounting Type: Through Hole
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Package Compatibility:

Primary: TO-220-3 Full Pack (standard tab)
Secondary: TO-220-3 Full Pack, Isolated Tab (ITO-220AB) for applications requiring isolation

Substitute parts are grouped into three categories:

Direct Equivalents: Parts with identical or superior electrical specifications and matching package configurations, enabling direct replacement without circuit modification.

Compatible Substitutes: Parts meeting all mandatory electrical parameters but with different package variants (isolated vs. standard tab) or minor specification variations, suitable for applications where package isolation is beneficial or acceptable.

Similar Alternatives: Parts with matching voltage and configuration but higher current ratings or different thermal characteristics, applicable when design margins permit specification upgrades.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Max)	Package	Status
MBRF2045CTG	onsemi	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	175°C	TO-220-3 Full Pack	Obsolete
STPS2045CFP	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	175°C	TO-220-3 Full Pack	Active
STPS20L45CFP	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	150°C	TO-220-3 Full Pack	Active
VFT2045CBP-M3/4W	Vishay General Semiconductor - Diodes Division	45 V	10 A	580 mV @ 10 A	2 mA @ 45 V	200°C	TO-220-3 Full Pack, Isolated Tab	Active
MBRF2045CTP	SMC Diode Solutions	45 V	Not Specified	840 mV @ 20 A	1 mA @ 45 V	150°C	TO-220-3 Full Pack, Isolated Tab	Active
MBRF2045CTU	SMC Diode Solutions	45 V	Not Specified	500 mV @ 10 A	1 mA @ 45 V	125°C	TO-220-3 Full Pack, Isolated Tab	Active
MBRF2045CT	Diodes Incorporated	60 V	10 A	640 mV @ 10 A	100 µA @ 60 V	150°C	TO-220-3 Full Pack, Isolated Tab	Obsolete
MBR3045CTF-E1	Diodes Incorporated	45 V	15 A	700 mV @ 15 A	100 µA @ 45 V	150°C	TO-220-3 Full Pack	Active

Engineering Selection Recommendations

Primary Recommendation: STPS2045CFP

The STPS2045CFP from STMicroelectronics is the optimal direct substitute for the MBRF2045CTG. This part provides identical electrical specifications across all critical parameters: 45 V reverse voltage, 10 A average rectified current, 570 mV forward voltage at 10 A, and 100 µA reverse leakage at 45 V. The device maintains the same TO-220-3 Full Pack package configuration, enabling direct board-level replacement. STPS2045CFP is actively manufactured and ROHS3 compliant, ensuring long-term availability and regulatory compliance.

Secondary Recommendation: STPS20L45CFP

The STPS20L45CFP from STMicroelectronics serves as an alternative direct substitute with marginally superior forward voltage characteristics (550 mV @ 10 A versus 570 mV). This part is actively produced and maintains the same package and voltage rating. The maximum junction temperature is specified at 150°C compared to 175°C for the original part; this difference is acceptable for most applications operating within standard thermal envelopes.

Alternative with Isolated Tab: VFT2045CBP-M3/4W

The VFT2045CBP-M3/4W from Vishay General Semiconductor - Diodes Division provides equivalent electrical performance with the added benefit of an isolated tab (ITO-220AB package). This configuration is suitable for applications requiring electrical isolation between the device tab and mounting surface. The part features a maximum junction temperature of 200°C, providing enhanced thermal margin. TMBS® series technology ensures fast recovery characteristics and ROHS3 compliance.

Higher Current Alternative: MBR3045CTF-E1

The MBR3045CTF-E1 from Diodes Incorporated offers a 15 A average rectified current rating compared to the 10 A specification of the MBRF2045CTG. This part maintains the 45 V reverse voltage and TO-220-3 Full Pack package. Selection of this part is appropriate for designs requiring increased current capacity or where design margin enhancement is beneficial. The part is actively manufactured and ROHS3 compliant.

Elevated Voltage Alternative: MBRF2045CT

The MBRF2045CT from Diodes Incorporated provides a 60 V reverse voltage rating with 10 A current capacity and isolated tab packaging. This part is suitable for applications where higher voltage margin is required. However, the part is classified as obsolete; procurement should be verified before design implementation.

Frequently Asked Questions (FAQ)

Q: Can STPS2045CFP directly replace MBRF2045CTG without circuit modification?

A: Yes. STPS2045CFP provides identical electrical specifications and the same TO-220-3 Full Pack package configuration. Direct board-level substitution is supported without circuit redesign.

Q: What is the difference between TO-220-3 Full Pack and TO-220-3 Full Pack, Isolated Tab packages?

A: The standard TO-220-3 Full Pack features a conductive tab electrically connected to the device substrate. The isolated tab variant (ITO-220AB) provides electrical isolation between the tab and internal circuitry, enabling direct mounting to conductive heat sinks without additional isolation hardware. Selection depends on thermal management and isolation requirements of the specific application.

Q: Is MBRF2045CTU suitable as a substitute despite lower maximum junction temperature?

A: MBRF2045CTU operates at a maximum junction temperature of 125°C compared to 175°C for the MBRF2045CTG. This part is suitable only for applications where the thermal environment maintains junction temperatures below 125°C. Forward voltage at 10 A is specified at 500 mV, providing superior performance in this parameter.

Q: Why is MBRF2045CT rated for 60 V when the original part is 45 V?

A: MBRF2045CT is a higher voltage variant designed for applications requiring greater reverse voltage margin. The elevated rating does not affect compatibility in 45 V applications; however, the part is classified as obsolete and should not be selected for new designs.

Q: Can MBR3045CTF-E1 be used in place of MBRF2045CTG?

A: MBR3045CTF-E1 is compatible from an electrical standpoint, providing the same 45 V reverse voltage with enhanced 15 A current capacity. This part is suitable for applications where increased current rating provides design margin or where future current requirements may exceed 10 A. The TO-220-3 Full Pack package enables direct substitution.

Q: What compliance certifications apply to substitute parts?

A: All recommended substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. STPS2045CFP, STPS20L45CFP, and VFT2045CBP-M3/4W are REACH Unaffected. MBRF2045CTP, MBRF2045CTU, and MBRF2045CT are REACH Affected. All parts carry EAR99 ECCN classification and 8541.10.0080 HTSUS code.

Q: Are there performance differences in forward voltage between substitute options?

A: Forward voltage specifications vary across substitutes. MBRF2045CTU specifies 500 mV @ 10 A (lowest), STPS20L45CFP specifies 550 mV @ 10 A, MBRF2045CTG and STPS2045CFP specify 570 mV @ 10 A, and VFT2045CBP-M3/4W specifies 580 mV @ 10 A. These variations are within typical Schottky diode performance ranges and do not affect functional compatibility in standard rectification applications.

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