STTH4R02B Equivalent & Substitute Parts

Part Overview

The STTH4R02B is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 4 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The STTH4R02B-TR represents the active production variant of this diode, while alternative manufacturers offer functionally compatible options with comparable electrical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.05	V @ 4 A
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	3	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH4R02B is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain the 200 V DC reverse voltage specification to ensure safe operation in the original circuit application.

Current Rating: The original part is rated for 4 A average rectified current. Substitute parts with equal or higher current ratings (4 A or 5 A) are electrically compatible. Parts with lower current ratings (3 A) represent downrated alternatives suitable only for applications with reduced current demands.

Package Compatibility: All substitute parts use the TO-252-3 DPAK package with identical pinout and thermal characteristics, enabling direct mechanical and electrical substitution without PCB redesign.

Speed Classification: All substitute parts maintain fast recovery characteristics (≤ 500ns, > 200mA), ensuring compatibility with switching applications and transient response requirements.

Compliance Standards: All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Parameter Comparison

Parameter	STTH4R02B	STTH4R02B-TR	RFN5BM2STL	RFN3BM2STL
Manufacturer	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	Rohm Semiconductor
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	4 A	4 A	5 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 4 A	1.05 V @ 4 A	980 mV @ 5 A	980 mV @ 3 A
Reverse Recovery Time (trr)	30 ns	30 ns	25 ns	25 ns
Current - Reverse Leakage @ Vr	3 µA @ 200 V	3 µA @ 200 V	10 µA @ 200 V	10 µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature - Junction (Max)	175°C	175°C	150°C	150°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: STTH4R02B-TR

The STTH4R02B-TR is the direct equivalent of the obsolete STTH4R02B. This part is manufactured by STMicroelectronics and maintains identical electrical specifications, including 200 V reverse voltage, 4 A current rating, 1.05 V forward voltage, and 30 ns reverse recovery time. The STTH4R02B-TR is in active production status, ensuring long-term availability and supply chain continuity. The only difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance. This part is the preferred choice for direct replacement in existing designs.

Secondary Substitute: RFN5BM2STL

The RFN5BM2STL manufactured by Rohm Semiconductor provides a higher current rating of 5 A while maintaining the 200 V voltage specification and TO-252-3 DPAK package. This part is suitable for applications where the original 4 A rating is marginal or where design headroom is required. The RFN5BM2STL exhibits lower forward voltage (980 mV @ 5 A) and faster reverse recovery time (25 ns), resulting in reduced power dissipation and improved switching performance. Operating temperature is rated to 150°C, which is 25°C lower than the original part. This part is in active production status.

Tertiary Substitute: RFN3BM2STL

The RFN3BM2STL manufactured by Rohm Semiconductor provides a lower current rating of 3 A while maintaining the 200 V voltage specification and TO-252-3 DPAK package. This part is suitable only for applications where circuit current demands do not exceed 3 A. The RFN3BM2STL exhibits lower forward voltage (980 mV @ 3 A) and faster reverse recovery time (25 ns). Operating temperature is rated to 150°C. This part is in active production status and represents a downrated alternative.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original STTH4R02B.

Frequently Asked Questions (FAQ)

Q: Can STTH4R02B-TR be used as a direct replacement for STTH4R02B?

A: Yes. The STTH4R02B-TR is electrically and mechanically identical to the STTH4R02B. Both parts share the same voltage rating (200 V), current rating (4 A), forward voltage (1.05 V @ 4 A), reverse recovery time (30 ns), and TO-252-3 DPAK package. The only difference is the packaging format (Tape & Reel versus bulk). The STTH4R02B-TR is in active production, making it the recommended replacement for the obsolete STTH4R02B.

Q: What is the difference between RFN5BM2STL and STTH4R02B?

A: The RFN5BM2STL has a higher current rating (5 A versus 4 A) and lower forward voltage (980 mV @ 5 A versus 1.05 V @ 4 A). Both parts maintain 200 V reverse voltage and TO-252-3 DPAK package compatibility. The RFN5BM2STL has a lower operating temperature maximum (150°C versus 175°C) and faster reverse recovery time (25 ns versus 30 ns). The RFN5BM2STL is suitable for applications requiring higher current capacity or lower power dissipation.

Q: Can RFN3BM2STL replace STTH4R02B in all applications?

A: No. The RFN3BM2STL has a lower current rating (3 A versus 4 A) and is suitable only for applications where circuit current does not exceed 3 A. Both parts maintain 200 V reverse voltage and TO-252-3 DPAK package compatibility. The RFN3BM2STL should be used only when the original 4 A rating exceeds application requirements.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-252-3 DPAK package with identical pinout and thermal characteristics. Direct PCB substitution is possible without layout modifications.

Q: What is the compliance status of substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original STTH4R02B.

Q: How do reverse recovery times compare across substitute parts?

A: The STTH4R02B and STTH4R02B-TR have 30 ns reverse recovery time. The RFN5BM2STL and RFN3BM2STL have 25 ns reverse recovery time. Faster reverse recovery reduces switching losses and improves transient response in high-frequency applications.

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

A: The STTH4R02B and STTH4R02B-TR have 3 µA reverse leakage at 200 V. The RFN5BM2STL and RFN3BM2STL have 10 µA reverse leakage at 200 V. Lower leakage current reduces standby power consumption in applications with extended idle periods.

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