TST30L45CW Equivalent & Substitute Parts

Part Overview

The TST30L45CW is a Schottky diode rated for 45 V DC reverse voltage and 15 A average rectified current in a Through Hole TO-220AB package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 45 V
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TST30L45CW is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 15 A minimum per diode
Mounting Type: Through Hole
Package / Case: TO-220-3
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Ranges:

Forward Voltage (Vf) @ 15 A: Up to 750 mV (original: 550 mV)
Reverse Leakage Current @ Vr: Up to 1 mA (original: 500 µA)
Operating Temperature - Junction: Minimum -55°C, Maximum 150°C
RoHS Compliance: ROHS3 Compliant required

The substitute parts MBR2545CTG and MBR2550CT meet these criteria with the following considerations: MBR2545CTG is an active product with improved reverse leakage characteristics, while MBR2550CT operates at a higher voltage rating (50 V) and is also obsolete.

Parameter Comparison

Parameter	TST30L45CW	MBR2545CTG	MBR2550CT
Manufacturer	Taiwan Semiconductor Corporation	onsemi	Diodes Incorporated
Product Status	Obsolete	Active	Obsolete
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	50 V
Current - Average Rectified (Io)	15 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A	620 mV @ 15 A	750 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 45 V	200 µA @ 45 V	1 mA @ 50 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
Technology	Schottky	Schottky	Schottky
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MBR2545CTG (onsemi) is the primary substitute for the TST30L45CW. This part is currently Active, ensuring long-term availability and supply chain stability. It matches the critical electrical parameters: 45 V reverse voltage rating, 15 A current capacity, and TO-220-3 package. The forward voltage is 70 mV higher (620 mV vs. 550 mV), which is within acceptable tolerance for most rectification applications. The reverse leakage current is superior at 200 µA compared to the original 500 µA. Extended operating temperature range (-65°C to 175°C) provides additional margin. ROHS3 compliance is maintained.

MBR2550CT (Diodes Incorporated) is a secondary substitute option. While it meets the voltage, current, and package requirements, it carries an Obsolete status similar to the original part, limiting its utility for long-term production. The 50 V reverse voltage rating provides overvoltage margin, but the forward voltage is significantly higher at 750 mV, and reverse leakage is elevated at 1 mA. REACH Status is listed as Affected, which may introduce regulatory considerations.

For new designs and production continuity, MBR2545CTG is the recommended selection based on Active product status and superior electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can MBR2545CTG directly replace TST30L45CW in existing designs?

A: Yes. Both parts share identical voltage ratings (45 V), current ratings (15 A per diode), package type (TO-220-3), and mounting method (Through Hole). The forward voltage difference of 70 mV is within typical design tolerances for Schottky rectifier applications. Pin configuration and thermal characteristics are compatible.

Q: What is the significance of the diode configuration difference?

A: The TST30L45CW is a single diode, while MBR2545CTG and MBR2550CT are diode arrays with 1 Pair Common Cathode configuration. In single-diode applications, only one diode of the array is utilized. The common cathode configuration does not affect single-diode operation. Unused diodes must remain unconnected.

Q: Why is MBR2545CTG preferred over MBR2550CT?

A: MBR2545CTG is an Active product with current manufacturing support, ensuring availability for future orders. MBR2550CT is Obsolete, presenting the same supply risk as the original TST30L45CW. Additionally, MBR2545CTG exhibits superior reverse leakage characteristics (200 µA vs. 1 mA) and lower forward voltage (620 mV vs. 750 mV).

Q: Are there thermal management differences between these parts?

A: All three parts operate within the -55°C to 150°C junction temperature range specified for the TST30L45CW. MBR2545CTG extends the upper limit to 175°C. Thermal dissipation is determined by forward voltage and current; the 70 mV increase in MBR2545CTG results in proportionally higher power dissipation under full-load conditions.

Q: What compliance certifications apply to these substitutes?

A: All three parts are ROHS3 Compliant and carry EAR99 ECCN classification. MBR2550CT is listed as REACH Affected, while TST30L45CW and MBR2545CTG are REACH Unaffected. Regulatory requirements for your application region must be evaluated independently.

Q: Is the TO-220 package designation equivalent to TO-220-3?

A: Yes. TO-220 and TO-220-3 refer to the same three-lead Through Hole package. The "-3" designation explicitly indicates three leads. Physical dimensions, pin spacing, and mounting hole locations are identical across all three parts.

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