TST40L100CW Equivalent & Substitute Parts

Part Overview

The TST40L100CW is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 20 A average rectified current in a TO-220AB through-hole 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 to support existing applications, maintenance requirements, and design transitions to active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 20 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 100 V
Technology	Schottky	—
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TST40L100CW is determined by the following critical parameters:

Voltage Rating: The substitute must support a minimum DC reverse voltage (Vr) of 100 V to maintain circuit protection and reliability.

Current Rating: The substitute must support a minimum average rectified current (Io) of 20 A to handle the design load without thermal stress or failure.

Package Type: The substitute must use TO-220-3 or TO-220AB through-hole packaging to ensure mechanical and thermal compatibility with existing PCB layouts and heat sinking arrangements.

Technology: Schottky diode technology is required to maintain fast recovery characteristics (≤ 500ns) and low forward voltage drop performance.

Compliance: All substitutes must maintain ROHS3 compliance and operate within the -55°C to 150°C junction temperature range.

The substitute parts identified fall into two categories:

Category A - Direct Electrical Equivalents: Parts with 100 V rating and 20 A or higher current capacity in TO-220-3 packaging. These include V20100SG-M3/4W (Vishay, 20 A), V30100S-E3/4W (Vishay, 30 A), and V30100S-M3/4W (Vishay, 30 A).

Category B - Partial Equivalents: Parts with reduced voltage or current ratings, or alternative configurations. These include ST3045C (SMC, 45 V, diode array) and MBRB41H100CT-1G (Fairchild, bulk packaging).

Category C - Functional Equivalents: Parts with matching electrical specifications and active product status. ST40100C (SMC, 100 V, diode array configuration) provides electrical equivalence with active support.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	Inventory [Pcs]
TST40L100CW	Taiwan Semiconductor Corporation	100	20	750 @ 20 A	TO-220-3	Not For New Designs	1174
V20100SG-M3/4W	Vishay General Semiconductor	100	20	1070 @ 20 A	TO-220-3	Active	986
V30100S-E3/4W	Vishay General Semiconductor	100	30	910 @ 30 A	TO-220-3	Active	2812
V30100S-M3/4W	Vishay General Semiconductor	100	30	1000 @ 30 A	TO-220-3	Active	3888
ST40100C	SMC Diode Solutions	100	—	750 @ 20 A	TO-220-3	Active	2014
ST3045C	SMC Diode Solutions	45	—	570 @ 15 A	TO-220-3	Active	2084
MBRB41H100CT-1G	Fairchild Semiconductor	—	—	—	Bulk	Active	2750

Engineering Selection Recommendations

For Direct Replacement (100 V, 20 A, Active Status):

V20100SG-M3/4W is the primary direct substitute. It maintains identical voltage and current ratings, TO-220-3 packaging, and active product status. Forward voltage is higher (1070 mV vs. 750 mV @ 20 A), which increases power dissipation by approximately 6.4 W at full current. Thermal design verification is required if the original design operated near thermal limits.

For Enhanced Current Capacity (100 V, 30 A, Active Status):

V30100S-E3/4W and V30100S-M3/4W provide 50% higher current capacity while maintaining 100 V voltage rating and TO-220-3 packaging. Both are active products with ROHS3 compliance. These parts are suitable for applications requiring design margin or future current growth. Forward voltage characteristics differ between variants (910 mV vs. 1000 mV @ 30 A).

For Electrical Equivalence with Diode Array Configuration:

ST40100C (SMC Diode Solutions) provides 100 V rating with matching forward voltage (750 mV @ 20 A) and active product status. This part is configured as a 1 Pair Common Cathode diode array in TO-220-3 packaging. Circuit topology compatibility must be verified before selection.

For Reduced Voltage Applications:

ST3045C is suitable only for applications with maximum 45 V reverse voltage requirements. This part is not a substitute for 100 V designs.

Packaging Constraint:

MBRB41H100CT-1G uses bulk packaging and lacks detailed electrical parameter data in the provided specifications. This part is not recommended for direct substitution without additional technical documentation.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and operate within the -55°C to 150°C junction temperature range. V20100SG-M3/4W, V30100S-E3/4W, and V30100S-M3/4W have REACH Unaffected status. ST40100C and ST3045C have REACH Affected status, requiring supply chain verification for specific applications.

Frequently Asked Questions (FAQ)

Q: Can V20100SG-M3/4W be used as a direct drop-in replacement for TST40L100CW?

A: V20100SG-M3/4W matches the voltage (100 V) and current (20 A) ratings and uses identical TO-220-3 packaging. However, forward voltage is significantly higher (1070 mV vs. 750 mV @ 20 A). This increases power dissipation by approximately 6.4 W at full current. Thermal analysis of the PCB and heat sink design is required to confirm compatibility. If the original design included thermal margin, substitution is feasible. If the original design operated near thermal limits, this part may cause overheating.

Q: What is the difference between V30100S-E3/4W and V30100S-M3/4W?

A: Both parts have identical voltage (100 V) and current (30 A) ratings, TO-220-3 packaging, and active product status. The primary difference is forward voltage: V30100S-E3/4W is rated at 910 mV @ 30 A, while V30100S-M3/4W is rated at 1000 mV @ 30 A. V30100S-E3/4W has lower reverse leakage (1 mA @ 100 V) compared to V30100S-M3/4W (350 µA @ 100 V). Selection depends on thermal budget and leakage current requirements.

Q: Why is ST40100C listed as a substitute if it is a diode array?

A: ST40100C is configured as a 1 Pair Common Cathode diode array in TO-220-3 packaging with 100 V rating and 750 mV forward voltage @ 20 A, matching the TST40L100CW electrical specifications. However, the diode array configuration requires circuit topology verification. If the application uses only one diode or requires independent cathode connections, ST40100C is not suitable. If the application can utilize the common cathode configuration, ST40100C provides electrical equivalence with active product support.

Q: Can ST3045C replace TST40L100CW in a 100 V circuit?

A: No. ST3045C is rated for maximum 45 V reverse voltage, which is insufficient for 100 V circuit protection. Using ST3045C in a 100 V application will result in diode failure and circuit damage. ST3045C is suitable only for applications with maximum 45 V reverse voltage requirements.

Q: What does "Not For New Designs" mean for TST40L100CW?

A: "Not For New Designs" indicates the TST40L100CW has reached end-of-life status and is no longer recommended for new product development. Existing inventory may be available for legacy system support and maintenance, but new designs should use active alternatives such as V20100SG-M3/4W, V30100S-E3/4W, V30100S-M3/4W, or ST40100C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (V20100SG-M3/4W, V30100S-E3/4W, V30100S-M3/4W, ST40100C, ST3045C, and MBRB41H100CT-1G) are ROHS3 compliant. However, REACH status varies. V20100SG-M3/4W, V30100S-E3/4W, and V30100S-M3/4W have REACH Unaffected status. ST40100C and ST3045C have REACH Affected status. Supply chain verification is required for applications subject to REACH regulations.

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

A: Forward voltage directly affects power dissipation in the diode. Power dissipation is calculated as P = Vf × Io. For TST40L100CW at 20 A: P = 0.75 V × 20 A = 15 W. For V20100SG-M3/4W at 20 A: P = 1.07 V × 20 A = 21.4 W. The 6.4 W increase requires verification that the heat sink and PCB thermal design can accommodate the additional heat. If thermal limits are exceeded, the diode will operate above rated junction temperature, reducing reliability and lifespan.

Q: Can I use a 30 A rated diode in place of a 20 A rated diode?

A: Yes, if all other parameters match. V30100S-E3/4W and V30100S-M3/4W are rated for 30 A, exceeding the 20 A requirement of TST40L100CW. Higher current rating provides design margin and thermal headroom. However, forward voltage and reverse leakage characteristics differ. Thermal analysis is required to confirm that increased forward voltage does not cause overheating.

Q: What is the significance of operating temperature range differences?

A: TST40L100CW operates from -55°C to 150°C junction temperature. V20100SG-M3/4W, V30100S-E3/4W, and V30100S-M3/4W operate from -40°C to 150°C. The upper temperature limit is identical, but the lower limit is 15°C higher for Vishay parts. For applications requiring operation below -40°C, TST40L100CW or ST40100C/ST3045C (both -55°C to 150°C) must be used.

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