MBR40100WT Schottky Diode Equivalent & Substitute Parts

Part Overview

The MBR40100WT is a Schottky rectifier diode manufactured by Littelfuse Inc., rated for 100 V DC reverse voltage and 20 A average rectified current in a Through Hole TO-247-3 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	880 mV @ 20 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 100 V
Mounting Type	Through Hole	-
Package / Case	TO-247-3	-
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the MBR40100WT is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Mounting Type: Through Hole
Package / Case: TO-247-3
Technology: Schottky
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Current - Average Rectified (Io): 20 A or greater
Voltage - Forward (Vf) (Max) @ If: Within acceptable circuit design margins
Current - Reverse Leakage @ Vr: Lower values preferred; higher values acceptable within circuit tolerance
Operating Temperature - Junction: Maximum rating of 150°C or higher

Substitute parts are grouped into two categories based on current rating capacity: parts rated at 20 A (direct current equivalents) and parts rated above 20 A (higher current capacity alternatives).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Reverse Leakage [µA @ 100V]	Tj (Max) [°C]	Package	Status
MBR40100WT	Littelfuse Inc.	100	20	880 @ 20A	1000	150	TO-247-3	Active
STPS40H100CW	STMicroelectronics	100	20	730 @ 20A	10	175	TO-247-3	Active
STPS30H100CW	STMicroelectronics	100	15	800 @ 15A	5	175	TO-247-3	Active
STPS61H100CW	STMicroelectronics	100	30	790 @ 30A	16	175	TO-247-3	Active
VS-30CPQ100-N3	Vishay General Semiconductor - Diodes Division	100	30	1050 @ 30A	550	Not Specified	TO-247-3	Active
MBR40H100WTG	onsemi	100	20	800 @ 20A	10	175	TO-247-3	Obsolete

Engineering Selection Recommendations

Primary Substitute (Direct Equivalent): STPS40H100CW from STMicroelectronics is the recommended primary substitute for MBR40100WT. This part maintains identical voltage and current ratings (100 V, 20 A), operates in the same TO-247-3 package, and holds Active product status. The forward voltage is lower (730 mV vs. 880 mV), resulting in reduced power dissipation. Operating temperature maximum is higher (175°C vs. 150°C), providing extended thermal margin. ROHS3 compliance is confirmed.

Secondary Substitutes (Higher Current Capacity): STPS61H100CW and VS-30CPQ100-N3 are suitable for applications where current capacity exceeding 20 A is required. Both maintain 100 V reverse voltage rating and TO-247-3 package compatibility. STPS61H100CW offers superior performance with lower forward voltage (790 mV @ 30A) and lower reverse leakage (16 µA). VS-30CPQ100-N3 exhibits higher forward voltage (1050 mV @ 30A) and higher reverse leakage (550 µA), requiring circuit-level evaluation.

Current-Limited Substitute: STPS30H100CW is suitable only for applications where the load current does not exceed 15 A. This part is not recommended as a direct substitute for 20 A applications.

Obsolete Part: MBR40H100WTG (onsemi) is classified as Obsolete and should not be selected for new designs or long-term supply planning.

Frequently Asked Questions (FAQ)

Q: Can STPS30H100CW replace MBR40100WT in a 20 A application? A: No. STPS30H100CW is rated for 15 A average rectified current per diode, which is below the 20 A requirement of MBR40100WT. Use only in applications where load current does not exceed 15 A.

Q: What is the difference between MBR40100WT and STPS40H100CW in terms of thermal performance? A: STPS40H100CW has a maximum junction temperature of 175°C compared to MBR40100WT at 150°C. Additionally, STPS40H100CW exhibits lower forward voltage (730 mV vs. 880 mV at 20 A), resulting in lower power dissipation and reduced thermal load in the circuit.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (STPS40H100CW, STPS30H100CW, STPS61H100CW, VS-30CPQ100-N3, and MBR40H100WTG) are ROHS3 compliant. MBR40100WT is also ROHS3 compliant.

Q: Can I use VS-30CPQ100-N3 as a substitute if my circuit only requires 20 A? A: Yes, from a current capacity perspective. However, VS-30CPQ100-N3 exhibits higher forward voltage (1050 mV @ 30A) and significantly higher reverse leakage (550 µA @ 100V) compared to MBR40100WT (880 mV, 1 mA). Circuit-level thermal and efficiency analysis is required to confirm suitability.

Q: Is the TO-247-3 package identical across all substitute parts? A: Yes. All substitute parts use the TO-247-3 Through Hole package, ensuring mechanical and thermal interface compatibility with MBR40100WT.

Q: Why is MBR40H100WTG listed if it is Obsolete? A: MBR40H100WTG is included for reference purposes only, as it appears in the original substitute list. This part should not be selected for new designs due to its Obsolete status and uncertain long-term availability.

Q: What is the primary advantage of STPS61H100CW over MBR40100WT? A: STPS61H100CW provides 30 A current capacity (vs. 20 A), lower forward voltage (790 mV @ 30A vs. 880 mV @ 20A), and higher maximum junction temperature (175°C vs. 150°C). It is suitable for applications requiring higher current headroom or improved thermal performance.

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