TST30L150CW Equivalent & Substitute Parts

Part Overview

The TST30L150CW is a Schottky rectifier diode rated for 150 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 "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this diode remains in active use.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	150 V
Current - Average Rectified (Io)	15 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 15 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 150 V
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 TST30L150CW is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 150 V minimum
Mounting Type: Through Hole
Package / Case: TO-220-3 or TO-220AB
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Current Rating Considerations:

Primary substitutes maintain 15 A or higher average rectified current per diode
Diode array configurations (1 Pair Common Cathode) are acceptable where per-diode current rating meets or exceeds 15 A

Acceptable Variations:

Forward voltage (Vf) may vary within typical Schottky diode ranges
Reverse leakage current may differ within acceptable limits for the voltage class
Operating temperature range may extend beyond the original specification

Substitute parts are grouped into two categories: direct single-diode replacements and diode array alternatives with equivalent per-diode current ratings.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Package	Config	Product Status
TST30L150CW	Taiwan Semiconductor Corporation	150 V	15 A	920 mV @ 15 A	100 µA @ 150 V	TO-220AB	Single Diode	Not For New Designs
DSA20C150PB	IXYS	150 V	10 A	880 mV @ 10 A	300 µA @ 150 V	TO-220-3	1 Pair Common Cathode	Active
ST30100C	SMC Diode Solutions	100 V	—	750 mV @ 15 A	500 µA @ 100 V	TO-220AB	1 Pair Common Cathode	Active
ST30150C	SMC Diode Solutions	150 V	—	1.36 V @ 15 A	200 µA @ 150 V	TO-220AB	1 Pair Common Cathode	Active
V20150S-E3/4W	Vishay General Semiconductor - Diodes Division	150 V	20 A	1.43 V @ 20 A	250 µA @ 150 V	TO-220-3	Single Diode	Active
V20150S-M3/4W	Vishay General Semiconductor - Diodes Division	150 V	20 A	1.6 V @ 20 A	200 µA @ 150 V	TO-220-3	Single Diode	Active
V20150SG-E3/4W	Vishay General Semiconductor - Diodes Division	150 V	20 A	1.6 V @ 20 A	200 µA @ 150 V	TO-220-3	Single Diode	Active
V20150SG-M3/4W	Vishay General Semiconductor - Diodes Division	150 V	20 A	1.6 V @ 20 A	200 µA @ 150 V	TO-220-3	Single Diode	Active
V30150C-M3/4W	Vishay General Semiconductor - Diodes Division	150 V	15 A	1.36 V @ 15 A	200 µA @ 150 V	TO-220-3	1 Pair Common Cathode	Active

Engineering Selection Recommendations

Direct Single-Diode Replacements (Preferred for Pin-Compatible Applications):

The Vishay V20150S-E3/4W, V20150S-M3/4W, V20150SG-E3/4W, and V20150SG-M3/4W series provide single-diode configurations with 150 V reverse voltage rating and 20 A current capacity. These parts are manufactured by an active supplier with ROHS3 compliance and REACH Unaffected status. The higher current rating (20 A versus 15 A) provides design margin for legacy system applications. Forward voltage characteristics vary between 1.43 V and 1.6 V at rated current, which is typical for modern Schottky technology and acceptable for most rectification circuits.

Diode Array Alternatives (For Dual-Diode Circuit Topologies):

The V30150C-M3/4W from Vishay provides a 1 Pair Common Cathode configuration with 150 V rating and 15 A per-diode current, matching the original TST30L150CW current specification. This part is actively manufactured and ROHS3 compliant. The ST30150C from SMC Diode Solutions offers equivalent voltage and current ratings in a diode array format with active product status.

Voltage-Reduced Alternative:

The ST30100C is suitable only for applications where the circuit operates at 100 V or lower reverse voltage. This part is not recommended as a direct substitute for 150 V applications.

Product Status Consideration:

All recommended substitutes carry "Active" product status, ensuring continued availability and manufacturing support. The original TST30L150CW is classified as "Not For New Designs," making transition to active alternatives necessary for long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the V20150S-M3/4W directly replace the TST30L150CW in a circuit board?

A: Yes, the V20150S-M3/4W is a direct pin-compatible replacement. Both parts use the TO-220-3 package with identical lead configuration. The 20 A current rating of the V20150S-M3/4W exceeds the 15 A requirement of the TST30L150CW, providing operational margin. Forward voltage at rated current is higher (1.6 V versus 920 mV), which may affect circuit efficiency but does not prevent functional substitution in rectification applications.

Q: What is the difference between single-diode and diode array substitutes?

A: Single-diode parts like the V20150S series contain one diode element in a TO-220-3 package. Diode array parts like the V30150C-M3/4W contain two diodes with a common cathode connection. Array configurations are suitable for bridge rectifier circuits or dual-diode topologies. Single-diode parts are appropriate for half-wave or single-diode rectification circuits. Pin configuration must be verified against the original circuit design.

Q: Is the ST30100C suitable as a substitute for the TST30L150CW?

A: The ST30100C is not recommended as a direct substitute. While it shares the TO-220AB package and Schottky technology, its 100 V reverse voltage rating is insufficient for applications requiring 150 V operation. Use of this part in a 150 V circuit would result in diode failure.

Q: What compliance certifications should I verify when selecting a substitute?

A: All recommended substitutes are ROHS3 compliant and carry REACH Unaffected or REACH Affected status. Verify that the selected part meets your specific regulatory requirements. The TST30L150CW is ROHS3 compliant and REACH Unaffected; most active substitutes maintain equivalent compliance levels.

Q: How does forward voltage variation affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. The TST30L150CW exhibits 920 mV at 15 A, while Vishay alternatives range from 1.43 V to 1.6 V at 20 A. Higher forward voltage increases power dissipation and heat generation. In low-voltage rectification circuits, this difference may be significant; in high-voltage applications, the percentage impact is reduced. Thermal management and circuit efficiency calculations should account for this variation.

Q: Are there any thermal considerations when substituting to a higher-current-rated diode?

A: Higher current ratings do not inherently increase thermal output. Thermal dissipation depends on actual circuit current and forward voltage drop. The V20150S series, rated for 20 A, will dissipate less heat than the TST30L150CW when operating at 15 A due to improved Schottky technology. Verify that the selected substitute's thermal characteristics are compatible with existing heat sink provisions.

Q: Can I use the DSA20C150PB as a substitute?

A: The DSA20C150PB is a diode array with 1 Pair Common Cathode configuration and 10 A per-diode rating. While it meets the 150 V voltage requirement, its 10 A current rating is below the 15 A specification of the TST30L150CW. This part is suitable only for applications where per-diode current does not exceed 10 A.

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