MBRF2545CT Equivalent & Substitute Parts

Part Overview

The MBRF2545CT 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 12.5 A per diode. The device is packaged in TO-220-3 Full Pack 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 equivalent and substitute components for ongoing design requirements and procurement needs.

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)	12.5 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 12.5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBRF2545CT is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 12.5 A or greater
Mounting Type: Through Hole
Package / Case: TO-220-3 Full Pack or compatible variant
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Direct Equivalents maintain identical electrical specifications and packaging. These parts are interchangeable without circuit modification.

Similar Substitutes maintain the core electrical parameters (45 V reverse voltage, Schottky technology, common cathode configuration, through-hole mounting) but may differ in current rating, forward voltage characteristics, reverse leakage current, or package variant. Selection depends on circuit requirements and thermal constraints.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Max)	Package	Product Status	RoHS Status
MBRF2545CT	onsemi	45 V	12.5 A	700 mV @ 12.5 A	200 µA @ 45 V	175°C	TO-220-3 Full Pack	Obsolete	RoHS non-compliant
MBRF2545CTG	onsemi	45 V	12.5 A	700 mV @ 12.5 A	200 µA @ 45 V	175°C	TO-220-3 Full Pack	Active	ROHS3 Compliant
MBRF2545CT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	12.5 A	820 mV @ 30 A	200 µA @ 45 V	150°C	TO-220-3 Full Pack, Isolated Tab	Active	ROHS3 Compliant
MBRF2545CT/45	Vishay General Semiconductor - Diodes Division	45 V	12.5 A	Not specified	200 µA @ 45 V	150°C	TO-220-3 Full Pack, Isolated Tab	Active	RoHS non-compliant
STPS20L45CFP	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	150°C	TO-220-3 Full Pack	Active	ROHS3 Compliant
STPS2545CT	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	175°C	TO-220-3	Active	ROHS3 Compliant
MBR3045CTF-E1	Diodes Incorporated	45 V	15 A	700 mV @ 15 A	100 µA @ 45 V	150°C	TO-220-3 Full Pack	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred):

MBRF2545CTG is the direct equivalent to MBRF2545CT. Both parts are manufactured by onsemi with identical electrical specifications and TO-220-3 Full Pack packaging. MBRF2545CTG is active in production status and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part.

Active Alternatives with Identical Current Rating:

STPS2545CT (STMicroelectronics) maintains the 12.5 A current rating and 45 V reverse voltage specification. This part offers improved forward voltage characteristics (570 mV vs. 700 mV at rated current) and lower reverse leakage current (125 µA vs. 200 µA). STPS2545CT is ROHS3 compliant and active in production. The package variant (TO-220-3 vs. TO-220-3 Full Pack) requires verification for mechanical fit in existing designs.

Higher Current Capability Alternative:

MBR3045CTF-E1 (Diodes Incorporated) provides 15 A current capacity, exceeding the 12.5 A specification of MBRF2545CT. This part maintains 45 V reverse voltage and Schottky technology with common cathode configuration. The increased current rating provides design margin for thermal and electrical stress. MBR3045CTF-E1 is ROHS3 compliant and active in production.

Lower Current Alternative:

STPS20L45CFP (STMicroelectronics) is rated for 10 A, below the 12.5 A specification. This part is suitable only for applications where the circuit current requirement does not exceed 10 A. STPS20L45CFP offers superior forward voltage characteristics (550 mV at 10 A) and is ROHS3 compliant.

Isolated Tab Variants:

MBRF2545CT-E3/45 and MBRF2545CT/45 (Vishay General Semiconductor - Diodes Division) feature isolated tab packaging (ITO-220AB), providing electrical isolation of the mounting tab from the diode cathode. These variants are suitable for applications requiring isolated mounting. MBRF2545CT-E3/45 is ROHS3 compliant; MBRF2545CT/45 is RoHS non-compliant.

All recommended substitutes maintain Schottky technology, 1 pair common cathode configuration, 45 V reverse voltage rating, fast recovery speed characteristics, and through-hole mounting. Selection among alternatives depends on specific circuit current requirements, thermal management constraints, compliance mandates, and mechanical packaging compatibility.

Frequently Asked Questions (FAQ)

Q: Can MBRF2545CTG be used as a direct replacement for MBRF2545CT?

A: Yes. MBRF2545CTG is manufactured by onsemi with identical electrical specifications (45 V, 12.5 A, 700 mV forward voltage, 200 µA reverse leakage) and TO-220-3 Full Pack packaging. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). MBRF2545CTG is a direct equivalent requiring no circuit modification.

Q: What is the difference between TO-220-3 Full Pack and TO-220-3 packaging?

A: TO-220-3 Full Pack includes a full plastic body encapsulation, while TO-220-3 refers to the standard three-lead through-hole package. Both are mechanically compatible with standard TO-220 mounting hardware. Verify mechanical fit in existing PCB layouts and heatsink mounting configurations.

Q: Can STPS20L45CFP replace MBRF2545CT in all applications?

A: STPS20L45CFP is rated for 10 A average rectified current, compared to 12.5 A for MBRF2545CT. This part is suitable only for circuits where the actual operating current does not exceed 10 A. If the circuit requires 12.5 A or higher current capacity, STPS20L45CFP is not appropriate.

Q: What are the advantages of MBR3045CTF-E1 over MBRF2545CT?

A: MBR3045CTF-E1 provides 15 A current capacity versus 12.5 A, offering increased thermal and electrical margin. Both parts maintain 45 V reverse voltage and Schottky technology. MBR3045CTF-E1 is ROHS3 compliant and active in production. The higher current rating may reduce junction temperature rise in high-current applications.

Q: Why do some substitutes have lower reverse leakage current?

A: Reverse leakage current (STPS2545CT at 125 µA vs. MBRF2545CT at 200 µA) reflects manufacturing process differences and device design. Lower reverse leakage reduces standby power dissipation and improves circuit efficiency. This parameter does not affect functional compatibility but may improve overall system performance.

Q: Are isolated tab variants (ITO-220AB) mechanically compatible with standard TO-220-3 mounting?

A: Isolated tab variants (MBRF2545CT-E3/45, MBRF2545CT/45) have the same three-lead configuration and mounting hole spacing as standard TO-220-3 packages. However, the isolated tab design electrically isolates the mounting tab from the diode cathode. Verify that existing heatsink and mounting hardware accommodate the isolated tab design before substitution.

Q: What is the significance of RoHS compliance status?

A: ROHS3 compliant parts meet Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. RoHS non-compliant parts (MBRF2545CT, MBRF2545CT/45) may not be acceptable for applications subject to environmental or regulatory compliance requirements. ROHS3 compliant alternatives are recommended for new designs and regulated applications.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage differences (550 mV to 820 mV across the substitute range) directly affect voltage drop across the diode and power dissipation. In rectifier circuits, lower forward voltage reduces heat generation and improves efficiency. In switching applications, forward voltage affects switching characteristics. Verify that circuit design accommodates the forward voltage specification of the selected substitute.

Q: What is the maximum junction temperature operating range?

A: MBRF2545CT operates to 175°C junction temperature. Most substitutes (MBRF2545CT-E3/45, MBRF2545CT/45, STPS20L45CFP, MBR3045CTF-E1) are rated to 150°C maximum. STPS2545CT maintains 175°C maximum. Higher junction temperature ratings provide greater thermal margin in high-power applications. Verify that thermal design accommodates the selected part's maximum junction temperature.

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