DST2045C Equivalent & Substitute Parts

Part Overview

The DST2045C is a Schottky diode array manufactured by Littelfuse Inc., 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 packaged in TO-220-3 through-hole configuration and is currently in active product status. Equivalent and substitute parts are necessary when the primary part is unavailable, when design requirements demand higher current ratings or improved thermal performance, or when alternative manufacturers' components are preferred for supply chain optimization.

Key Parameters

Parameter	DST2045C 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	580 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DST2045C is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Diode Configuration: Must be 1 Pair Common Cathode
Technology: Must be Schottky
Voltage - DC Reverse (Vr) (Max): Must be ≥ 45 V
Current - Average Rectified (Io) (per Diode): Must be ≥ 10 A
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-3
Speed: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (10 A Rating): Parts with identical 10 A current rating and 45 V reverse voltage rating. These provide pin-for-pin compatibility with minimal circuit impact.

Category 2 - Upgraded Substitutes (≥ 15 A Rating): Parts with current ratings of 15 A or higher and reverse voltage ratings of 45 V or greater. These provide enhanced thermal performance and current handling capability while maintaining electrical compatibility within the 45 V reverse voltage specification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Max)	Product Status
DST2045C	Littelfuse Inc.	45 V	10 A	580 mV @ 10 A	2 mA @ 45 V	150°C	Active
STPS2045CT	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	175°C	Active
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	500 µA @ 45 V	150°C	Obsolete
STPS1545CT	STMicroelectronics	45 V	7.5 A	570 mV @ 7.5 A	100 µA @ 45 V	175°C	Active
STPS2545CT	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	175°C	Active
STPS3045CT	STMicroelectronics	45 V	15 A	570 mV @ 15 A	200 µA @ 45 V	200°C	Active
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	150°C	Active
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	200 µA @ 45 V	175°C	Active
MBR60L45CTG	onsemi	45 V	30 A	550 mV @ 30 A	1.2 mA @ 45 V	175°C	Active
MBR2550CT	Diodes Incorporated	50 V	15 A	750 mV @ 15 A	1 mA @ 50 V	150°C	Obsolete
MBRP1545NTU	Fairchild Semiconductor	45 V	15 A	800 mV @ 15 A	1 mA @ 45 V	150°C	Active

Engineering Selection Recommendations

Primary Substitute - Direct Equivalent:

STPS2045CT (STMicroelectronics) is the recommended direct equivalent to DST2045C. This part maintains identical electrical specifications (45 V reverse voltage, 10 A average rectified current) and TO-220-3 package configuration. STPS2045CT is in active product status with ROHS3 compliance and demonstrates superior reverse leakage characteristics (100 µA versus 2 mA at 45 V). The part is widely available with 25,100 units in stock.

Secondary Substitutes - Upgraded Performance:

STPS3045CT (STMicroelectronics) provides upgraded current handling at 15 A while maintaining 45 V reverse voltage rating and TO-220-3 packaging. This part is suitable for applications requiring enhanced thermal margin and is in active product status with ROHS3 compliance. Maximum junction temperature is 200°C, providing superior thermal performance compared to the DST2045C.

STPS40L45CT (STMicroelectronics) offers 20 A current rating at 45 V reverse voltage in TO-220-3 package. This part is appropriate for designs requiring significant current headroom and is in active product status with ROHS3 compliance.

MBR2545CTG (onsemi) provides 15 A current rating at 45 V reverse voltage in TO-220-3 package with SWITCHMODE™ series designation. This part is in active product status with ROHS3 compliance and offers extended junction temperature range to 175°C.

MBR60L45CTG (onsemi) delivers 30 A current rating at 45 V reverse voltage in TO-220-3 package. This part is in active product status with ROHS3 compliance and extended junction temperature range to 175°C, suitable for high-current applications.

Parts Not Recommended:

MBR20L45CTG (onsemi) is in obsolete product status and should not be selected for new designs.

MBR2550CT (Diodes Incorporated) is in obsolete product status and should not be selected for new designs.

STPS1545CT (STMicroelectronics) has a current rating of 7.5 A, which is below the 10 A requirement of the DST2045C and is not suitable as a substitute.

MBRP1545NTU (Fairchild Semiconductor) exhibits elevated forward voltage (800 mV @ 15 A) compared to the DST2045C and other active alternatives, making it a less optimal choice for efficiency-critical applications.

Frequently Asked Questions (FAQ)

Q: Can STPS2045CT be used as a direct replacement for DST2045C without circuit modification?

A: Yes. STPS2045CT maintains identical reverse voltage (45 V), average rectified current (10 A), and TO-220-3 package configuration as DST2045C. Both parts are Schottky diode arrays with 1 Pair Common Cathode configuration and fast recovery characteristics. Pin-for-pin substitution is supported without circuit modification.

Q: What is the difference between direct equivalents and upgraded substitutes?

A: Direct equivalents such as STPS2045CT match the DST2045C in current rating (10 A) and voltage specification (45 V). Upgraded substitutes such as STPS3045CT, STPS40L45CT, MBR2545CTG, and MBR60L45CTG provide higher current ratings (15 A, 20 A, or 30 A) while maintaining the 45 V reverse voltage specification. Upgraded substitutes are electrically compatible but provide enhanced thermal performance and current handling capability.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts in active product status are ROHS3 compliant. Obsolete parts MBR20L45CTG and MBR2550CT are also ROHS3 compliant but should not be selected for new designs due to obsolescence.

Q: What is the significance of reverse leakage current differences among substitute parts?

A: Reverse leakage current affects power dissipation and circuit performance at elevated temperatures. DST2045C exhibits 2 mA reverse leakage at 45 V. STPS2045CT demonstrates lower reverse leakage at 100 µA, resulting in reduced standby power consumption. MBR60L45CTG exhibits 1.2 mA reverse leakage, which is intermediate between these values. Selection should consider application-specific leakage requirements.

Q: Can STPS1545CT be used as a substitute for DST2045C?

A: No. STPS1545CT has a maximum average rectified current of 7.5 A per diode, which is below the 10 A specification of DST2045C. This part does not meet the minimum current requirement and is not suitable as a substitute.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage (Vf) affects power dissipation and voltage drop across the diode. DST2045C specifies 580 mV @ 10 A. STPS2045CT specifies 570 mV @ 10 A, representing a 10 mV reduction. STPS40L45CT specifies 530 mV @ 20 A, representing improved efficiency at higher currents. MBR2545CTG specifies 620 mV @ 15 A, representing a 40 mV increase. Selection should consider thermal budget and efficiency requirements.

Q: Why are MBR20L45CTG and MBR2550CT not recommended despite meeting electrical specifications?

A: Both parts are in obsolete product status. MBR20L45CTG is obsolete and MBR2550CT is obsolete. Industry practice dictates that obsolete components should not be selected for new designs due to uncertain long-term availability and potential manufacturing discontinuation.

Q: What is the maximum junction temperature range across substitute options?

A: DST2045C specifies -55°C to 150°C. STPS3045CT offers the highest maximum junction temperature at 200°C. STPS2045CT, MBR2545CTG, and MBR60L45CTG specify 175°C maximum. STPS40L45CT and MBR20L45CTG specify 150°C maximum, matching DST2045C. Applications requiring extended thermal performance should prioritize parts with higher maximum junction temperature ratings.

Q: Are all substitute parts available in TO-220-3 package?

A: Yes. All substitute parts listed are configured in TO-220-3 through-hole package, ensuring mechanical compatibility with DST2045C in PCB layouts and thermal management solutions.

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