MBRF20L45CTG Equivalent & Substitute Parts

Part Overview

The MBRF20L45CTG 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 10 A per diode. The device is packaged in TO-220-3 Full Pack through-hole configuration and operates across a junction temperature range of -55°C to 150°C. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity.

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	500 mV @ 10 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°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 MBRF20L45CTG is determined by strict equivalence across the following critical 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): 10 A
Mounting Type: Through Hole
Package / Case: TO-220-3 Full Pack

Secondary Compatibility Parameters:

Fast Recovery speed characteristic (≤ 500 ns, > 200 mA)
RoHS3 compliance
MSL rating of 1 (Unlimited)

Substitute parts are grouped into two categories:

Group 1 - Direct Electrical Equivalents (45 V, 10 A): Parts meeting all primary substitution criteria with identical voltage and current ratings. These parts maintain full functional compatibility with the MBRF20L45CTG in circuit applications.

Group 2 - Reduced Current Rating (40 V, 5 A): Parts with lower voltage and current specifications. These parts are listed for reference but do not meet the full electrical requirements of the MBRF20L45CTG and are not suitable for direct substitution in applications requiring 45 V, 10 A performance.

Parameter Comparison

Parameter	MBRF20L45CTG (onsemi)	MBRF2045CT-E3/45 (Vishay)	STPS2045CFP (STMicroelectronics)	RB085T-40 (Rohm)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	40 V
Current - Average Rectified (Io) (per Diode)	10 A	10 A	10 A	5 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 10 A	650 mV @ 10 A	570 mV @ 10 A	550 mV @ 5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA
Current - Reverse Leakage @ Vr	500 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	200 µA @ 40 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	175°C (Max)	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack	TO-220-3 Full Pack
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

MBRF2045CT-E3/45 (Vishay General Semiconductor - Diodes Division)

This part is a direct electrical equivalent to the MBRF20L45CTG, meeting all primary substitution criteria with 45 V reverse voltage and 10 A average rectified current. The MBRF2045CT-E3/45 is classified as active product status, ensuring ongoing availability and supply chain continuity. The package variant includes an isolated tab (ITO-220AB) compared to the standard TO-220-3 Full Pack, which provides additional thermal and electrical isolation in certain circuit configurations. Forward voltage is higher at 650 mV versus 500 mV, and reverse leakage is lower at 100 µA versus 500 µA. Operating temperature range extends to -65°C minimum, providing broader low-temperature performance. ROHS3 compliance and MSL rating of 1 are maintained. This part is suitable for direct substitution in applications where the isolated tab feature is compatible with the circuit layout.

STPS2045CFP (STMicroelectronics)

This part is a direct electrical equivalent to the MBRF20L45CTG, meeting all primary substitution criteria with 45 V reverse voltage and 10 A average rectified current. The STPS2045CFP is classified as active product status. The package is standard TO-220-3 Full Pack without isolated tab. Forward voltage is 570 mV at 10 A, intermediate between the MBRF20L45CTG and MBRF2045CT-E3/45. Reverse leakage is 100 µA at 45 V. Maximum junction temperature is 175°C, providing enhanced high-temperature performance. ROHS3 compliance and MSL rating of 1 are maintained. This part is suitable for direct substitution in applications requiring standard TO-220-3 Full Pack configuration.

RB085T-40 (Rohm Semiconductor)

This part does not meet the full electrical requirements of the MBRF20L45CTG. The RB085T-40 is rated for 40 V reverse voltage and 5 A average rectified current, representing a reduced voltage and current specification. This part is not suitable for direct substitution in applications requiring 45 V, 10 A performance. The part is listed for reference only in applications where reduced voltage and current ratings are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the MBRF2045CT-E3/45 be used as a direct replacement for the MBRF20L45CTG?

A: The MBRF2045CT-E3/45 meets all primary electrical substitution criteria: 45 V reverse voltage, 10 A average rectified current, 1 pair common cathode configuration, Schottky technology, fast recovery speed, through-hole mounting, and TO-220-3 Full Pack package. The isolated tab variant (ITO-220AB) is compatible with standard TO-220-3 Full Pack footprints. Forward voltage and reverse leakage characteristics differ slightly but remain within acceptable operating parameters for Schottky diode arrays. This part is suitable for direct substitution.

Q: What is the difference between the TO-220-3 Full Pack and ITO-220AB packages?

A: The ITO-220AB package includes an isolated tab feature, providing electrical isolation between the tab and the semiconductor die. The standard TO-220-3 Full Pack does not include this isolation. Both packages are mechanically compatible with TO-220-3 footprints. The isolated tab variant may provide additional thermal and electrical isolation benefits in certain circuit configurations but does not affect basic functional compatibility.

Q: Why is the RB085T-40 listed if it cannot replace the MBRF20L45CTG?

A: The RB085T-40 is listed for reference purposes to illustrate the importance of matching voltage and current ratings in Schottky diode array selection. This part shares the same diode configuration, technology, and package family but operates at reduced specifications (40 V, 5 A versus 45 V, 10 A). Direct substitution is not possible in applications requiring the full 45 V, 10 A performance of the MBRF20L45CTG.

Q: What are the key differences in forward voltage between the substitute parts?

A: The MBRF20L45CTG specifies 500 mV maximum forward voltage at 10 A. The MBRF2045CT-E3/45 specifies 650 mV, and the STPS2045CFP specifies 570 mV at the same 10 A current. These differences reflect manufacturing process variations between manufacturers. Forward voltage affects power dissipation in the diode; higher forward voltage results in increased heat generation. Circuit thermal design should account for these variations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The MBRF20L45CTG, MBRF2045CT-E3/45, STPS2045CFP, and RB085T-40 are all ROHS3 compliant. All parts maintain MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

Q: What is the significance of product status (Obsolete vs. Active)?

A: The MBRF20L45CTG is classified as obsolete, indicating that onsemi has discontinued production and support for this part. The MBRF2045CT-E3/45 and STPS2045CFP are classified as active, indicating ongoing production, availability, and manufacturer support. Active product status ensures long-term supply chain continuity and access to technical documentation and support resources.

Q: Can the STPS2045CFP be used in applications requiring extended high-temperature operation?

A: The STPS2045CFP specifies a maximum junction temperature of 175°C, compared to 150°C for the MBRF20L45CTG and MBRF2045CT-E3/45. This higher temperature rating provides additional margin in applications with elevated ambient temperatures or high power dissipation. However, all three parts meet the basic temperature requirements of the MBRF20L45CTG across its specified operating range of -55°C to 150°C.

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