TST20H100CW Equivalent & Substitute Parts

Part Overview

The TST20H100CW is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 10 A average rectified current in a through-hole TO-220AB package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, legacy system maintenance, and procurement of functionally compatible alternatives from active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	790 mV @ 10 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TST20H100CW is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-3 or TO-220-2 (pin-compatible variants)
Operating Temperature Range: -55°C to 150°C or equivalent

Secondary Compatibility Factors:

Current - Average Rectified (Io): Equal to or greater than 10 A
Voltage - Forward (Vf): Within acceptable operating parameters for the application
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS3 Compliance: Required for regulatory alignment

Substitute parts are grouped into two categories based on package configuration and current rating:

Category 1: TO-220-3 Package, Higher Current Ratings (20 A and 30 A) These parts provide increased current capacity while maintaining the same voltage rating and package footprint. They are direct mechanical and electrical upgrades suitable for applications requiring higher current handling.

Category 2: TO-220-2 and TO-220-3 Package, Single Diode or Array Configuration These parts maintain the 100 V voltage rating and through-hole mounting but differ in pin configuration or internal topology. Selection depends on circuit topology requirements.

Parameter Comparison

Parameter	TST20H100CW	ST20100	ST20100C	V20100SG-M3/4W	V30100S-E3/4W	V30100S-M3/4W
Manufacturer	Taiwan Semiconductor Corporation	SMC Diode Solutions	SMC Diode Solutions	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	10 A	—	—	20 A	30 A	30 A
Voltage - Forward (Vf) (Max) @ If	790 mV @ 10 A	750 mV @ 20 A	750 mV @ 10 A	1.07 V @ 20 A	910 mV @ 30 A	1 V @ 30 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)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 100 V	1 mA @ 100 V	300 µA @ 100 V	350 µA @ 100 V	1 mA @ 100 V	350 µA @ 100 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-2	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-40 to 150°C	-40 to 150°C	-40 to 150°C
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Minimum Substitution):

ST20100C is the closest functional equivalent to TST20H100CW. Both components share the TO-220-3 package configuration, 100 V voltage rating, and Schottky technology. ST20100C is manufactured by SMC Diode Solutions with Active product status, ensuring long-term availability and supply chain continuity. Forward voltage characteristics at 10 A (750 mV) are comparable to the original part (790 mV). This part is suitable for applications where the original 10 A current rating is the design requirement.

For Upgraded Current Capacity:

V20100SG-M3/4W and V30100S-M3/4W are manufactured by Vishay General Semiconductor and provide higher current ratings (20 A and 30 A respectively) while maintaining the 100 V voltage rating and TO-220-3 package. These parts are appropriate for applications where increased current margin or higher load capacity is beneficial. Both parts carry Active product status and ROHS3 compliance.

V30100S-E3/4W offers the highest current rating (30 A) with the lowest reverse leakage current (1 mA @ 100 V) among the substitute options. This part is designated as part of the TMBS® series and is suitable for applications requiring superior leakage performance.

For Pin-Compatible Alternatives (TO-220-2 Package):

ST20100 is a TO-220-2 package variant from SMC Diode Solutions. This part is suitable only for applications where the circuit topology accommodates a two-pin configuration. The TO-220-2 package is not mechanically interchangeable with the TO-220-3 package without circuit board modification.

Compliance and Availability:

All substitute parts are ROHS3 compliant and carry Active product status, ensuring regulatory alignment and sustained manufacturing support. Selection should prioritize parts with Active status over Not For New Designs classifications for long-term design viability.

Frequently Asked Questions (FAQ)

Q: Can ST20100C be used as a direct replacement for TST20H100CW?

A: ST20100C is functionally compatible with TST20H100CW for applications rated at 10 A or below. Both parts share the TO-220-3 package, 100 V voltage rating, and Schottky technology. Forward voltage at 10 A differs slightly (750 mV vs. 790 mV), which is within acceptable operating margins for most rectifier applications. Verification of circuit performance under actual operating conditions is the responsibility of the design engineer.

Q: What is the difference between TO-220-2 and TO-220-3 packages?

A: The TO-220-2 package (ST20100) contains two leads, while the TO-220-3 package (TST20H100CW, ST20100C, V20100SG-M3/4W, V30100S-E3/4W, V30100S-M3/4W) contains three leads. The three-lead configuration typically includes a center tab for heat dissipation. These packages are not mechanically interchangeable without circuit board redesign. Pin assignment and circuit topology must be verified before substitution.

Q: Can I use a 30 A rated diode (V30100S-M3/4W or V30100S-E3/4W) in place of a 10 A rated diode (TST20H100CW)?

A: Yes. A higher current-rated diode can be used in an application designed for lower current. The 30 A diodes maintain the same 100 V voltage rating and TO-220-3 package as the original part. Forward voltage characteristics differ slightly due to different internal designs, but both parts operate within the 100 V specification. The higher current rating provides additional design margin without compromising circuit function.

Q: What is the significance of the TMBS® designation on V30100S-E3/4W and V30100S-M3/4W?

A: TMBS® is a Vishay trademark indicating a trench metal barrier Schottky technology. This designation identifies the internal diode construction method. From a substitution perspective, TMBS® diodes are Schottky rectifiers with the same voltage and current ratings as indicated in the part specifications. The technology designation does not affect mechanical or electrical compatibility for substitution purposes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (ST20100, ST20100C, V20100SG-M3/4W, V30100S-E3/4W, V30100S-M3/4W) are ROHS3 compliant, matching the compliance status of the original TST20H100CW. This ensures regulatory alignment for applications subject to RoHS directives.

Q: What is the difference in reverse leakage current between the substitute parts?

A: Reverse leakage current varies among substitute parts: ST20100 and V30100S-E3/4W specify 1 mA @ 100 V, while ST20100C specifies 300 µA @ 100 V, V20100SG-M3/4W specifies 350 µA @ 100 V, and V30100S-M3/4W specifies 350 µA @ 100 V. The original TST20H100CW specifies 200 µA @ 100 V. Lower reverse leakage is generally preferable in applications sensitive to standby current or leakage-induced heat dissipation. Selection should be based on application requirements.

Q: Why is TST20H100CW marked as "Not For New Designs"?

A: The "Not For New Designs" status indicates the part has reached end-of-life and is no longer recommended for new product development. This classification is assigned by the manufacturer to encourage migration to active product lines. Existing inventory may remain available, but long-term supply cannot be guaranteed. For new designs or legacy system updates, selection of an Active-status substitute part is recommended.

Q: Can I mix different substitute parts in the same circuit?

A: Mixing different diode types in the same circuit is an application-specific decision. If multiple diodes are used in parallel or series configurations, differences in forward voltage and reverse leakage characteristics may result in unequal current distribution or voltage sharing. Circuit analysis and thermal management verification are required when using different part types in the same application.

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