MBR1550CT Equivalent & Substitute Parts

Part Overview

The MBR1550CT is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with a maximum reverse voltage of 50 V and average rectified current of 15 A per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent substitute parts with comparable electrical and mechanical specifications are necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MBR1550CT
Manufacturer	Diodes Incorporated
Category	Diodes, Rectifiers
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io) (per Diode)	15 A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 50 V
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR1550CT is determined by the following critical parameters: diode configuration (1 pair common cathode), technology (Schottky), mounting type (through hole TO-220-3), and electrical ratings. Substitute parts must maintain compatibility across these dimensions while accommodating variations in voltage and current ratings within acceptable application limits.

The substitute parts are grouped based on the following allowed parameter variations:

Voltage Rating (Vr): Substitute parts operate at 45 V maximum reverse voltage, which is lower than the original 50 V specification. This represents a reduced voltage margin and must be evaluated against circuit requirements.

Current Rating (Io): Substitute parts range from 7.5 A to 20 A per diode, compared to the original 15 A specification. Selection depends on actual circuit current demands.

Forward Voltage (Vf): Substitute parts exhibit forward voltage drops ranging from 500 mV to 840 mV at their respective rated currents, compared to 900 mV for the original part.

Reverse Leakage Current: Substitute parts show leakage currents ranging from 100 µA to 2 mA at their rated voltages.

Operating Temperature Range: Substitute parts maintain junction temperature ranges between -55°C to -65°C minimum and 150°C to 175°C maximum.

Product Status: Active substitute parts ensure ongoing availability and manufacturing support, whereas obsolete alternatives may face procurement constraints.

Parameter Comparison

Parameter	MBR1550CT	DST2045C	MBR1545CTG	MBR20L45CTG	STPS40L45CT
Manufacturer	Diodes Incorporated	Littelfuse Inc.	onsemi	onsemi	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	50 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	10 A	7.5 A	10 A	20 A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 A	580 mV @ 10 A	840 mV @ 15 A	500 mV @ 10 A	530 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 50 V	2 mA @ 45 V	100 µA @ 45 V	500 µA @ 45 V	600 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	Max 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Active Product Alternatives: DST2045C (Littelfuse Inc.), MBR1545CTG (onsemi), and STPS40L45CT (STMicroelectronics) are classified as active products with ongoing manufacturing support and availability. These parts are preferred for new designs and long-term procurement strategies.

Voltage Derating Consideration: All substitute parts operate at 45 V maximum reverse voltage, representing a 5 V reduction from the original MBR1550CT specification. Circuit designs operating near the 50 V limit require evaluation to confirm compatibility with the reduced voltage rating.

Current Rating Selection:

MBR1545CTG (7.5 A) is suitable for applications requiring lower current capacity with extended temperature range (-65°C to 175°C) and superior reverse leakage characteristics (100 µA @ 45 V).

DST2045C (10 A) and MBR20L45CTG (10 A) provide intermediate current capacity. DST2045C is active and recommended; MBR20L45CTG is obsolete.

STPS40L45CT (20 A) accommodates higher current requirements and is the only substitute exceeding the original 15 A specification.

Compliance Status: All substitute parts maintain ROHS3 compliance and EAR99 export classification, consistent with the original part.

Temperature Range: MBR1545CTG extends the maximum junction temperature to 175°C, providing thermal margin advantage. DST2045C and MBR20L45CTG are limited to 150°C maximum, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can MBR1545CTG replace MBR1550CT in all applications?

A: MBR1545CTG is compatible with applications where the circuit current requirement does not exceed 7.5 A per diode and the maximum reverse voltage does not exceed 45 V. The reduced current rating and voltage specification must be verified against circuit requirements. MBR1545CTG offers superior reverse leakage performance (100 µA) and extended temperature range (-65°C to 175°C).

Q: What is the primary difference between DST2045C and STPS40L45CT?

A: Both parts are active products with 45 V maximum reverse voltage and TO-220-3 packaging. The primary difference is current rating: DST2045C is rated for 10 A per diode, while STPS40L45CT is rated for 20 A per diode. STPS40L45CT is selected for applications requiring higher current capacity. DST2045C exhibits lower forward voltage (580 mV @ 10 A) compared to STPS40L45CT (530 mV @ 20 A).

Q: Why is the reverse voltage reduced from 50 V to 45 V in substitute parts?

A: The substitute parts listed are available with 45 V maximum reverse voltage ratings. This represents the standard voltage rating available from active manufacturers for this diode array configuration. Circuit designs must confirm that 45 V maximum reverse voltage is acceptable for the intended application.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed (DST2045C, MBR1545CTG, MBR20L45CTG, and STPS40L45CT) are ROHS3 compliant, maintaining regulatory compliance with the original MBR1550CT.

Q: Which substitute part has the best reverse leakage performance?

A: MBR1545CTG exhibits the lowest reverse leakage current at 100 µA @ 45 V, compared to 1 mA @ 50 V for the original MBR1550CT. This represents superior leakage performance and is advantageous for low-power or precision applications.

Q: Can MBR20L45CTG be used as a substitute despite its obsolete status?

A: MBR20L45CTG is classified as obsolete and carries procurement risk. While electrically compatible with certain applications, active alternatives (DST2045C, MBR1545CTG, or STPS40L45CT) are recommended for new designs and ongoing production to ensure supply chain continuity.

Q: What is the forward voltage difference between substitute parts?

A: Forward voltage varies with current rating. MBR20L45CTG exhibits the lowest forward voltage at 500 mV @ 10 A, followed by STPS40L45CT at 530 mV @ 20 A, DST2045C at 580 mV @ 10 A, and MBR1545CTG at 840 mV @ 15 A. Lower forward voltage reduces power dissipation in high-current applications.

Q: Is the TO-220-3 package identical across all substitute parts?

A: All substitute parts use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility with the original MBR1550CT. Supplier device package designations may vary (TO-220, TO-220AB) but refer to the same physical form factor.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message