STTH10R04B Equivalent & Substitute Parts

Part Overview

The STTH10R04B is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage with 10 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the DPAK surface mount form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 10 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
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 eligibility for the STTH10R04B is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Performance Compatibility Criteria:

Current - Average Rectified (Io): Equal to or greater than 10 A
Voltage - Forward (Vf) (Max) @ If: Equal to or less than 1.7 V @ 10 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): Equal to or less than 40 ns

Acceptable Variance:

Operating Temperature - Junction: May differ from 175°C maximum
Current - Reverse Leakage @ Vr: May differ within standard ranges

The substitute parts identified below meet the mandatory matching criteria. Deviations in performance parameters are noted in the comparison table.

Parameter Comparison

Parameter	STTH10R04B (Main)	SDURD1040	SDURD1040CT	RR601BM4STL
Manufacturer	STMicroelectronics	SMC Diode Solutions	SMC Diode Solutions	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Not For New Designs
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	10 A	Not specified	Not specified (per Diode)	6 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 10 A	1.5 V @ 10 A	1.3 V @ 5 A	1.1 V @ 6 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Reverse Recovery Time (trr)	40 ns	45 ns	45 ns	Not specified
Current - Reverse Leakage @ Vr	10 µA @ 400 V	10 µA @ 400 V	30 µA @ 400 V	10 µA @ 400 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature - Junction	175°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SDURD1040 (SMC Diode Solutions)

The SDURD1040 is an active product offering the closest electrical alignment to the STTH10R04B. It maintains 400 V reverse voltage rating, fast recovery speed classification, and identical DPAK packaging. Forward voltage specification of 1.5 V @ 10 A is superior to the main part. ROHS3 compliance and unlimited moisture sensitivity level ensure regulatory compatibility. The operating temperature range of -55°C to 150°C represents a reduction from the main part's 175°C maximum junction temperature; this must be evaluated against application thermal requirements. Reverse recovery time of 45 ns exceeds the main part specification by 5 ns. This part is suitable for direct substitution in applications where the reduced maximum junction temperature is acceptable.

SDURD1040CT (SMC Diode Solutions)

The SDURD1040CT is a diode array configuration with 1 pair common cathode topology, differing fundamentally from the single-diode STTH10R04B. This part is not a direct functional equivalent and is suitable only for applications specifically designed for common cathode diode pair configurations. Forward voltage of 1.3 V @ 5 A and reverse leakage of 30 µA @ 400 V represent deviations from single-diode specifications. ROHS3 compliance and DPAK packaging are maintained. This part should be selected only when the application circuit topology explicitly requires a common cathode diode pair.

RR601BM4STL (Rohm Semiconductor)

The RR601BM4STL is classified as "Not For New Designs" and carries a reduced current rating of 6 A compared to the 10 A specification of the STTH10R04B. This current limitation makes it unsuitable for applications requiring the full 10 A rectified current capacity. The part exhibits standard recovery speed classification (>500ns) rather than fast recovery, representing a significant performance deviation. While 400 V reverse voltage and DPAK packaging are maintained, the reduced current capacity and speed classification preclude this part from serving as a direct substitute for the main part.

Frequently Asked Questions (FAQ)

Q: Can SDURD1040 replace STTH10R04B in all applications?

A: SDURD1040 is suitable for substitution in applications where the operating junction temperature does not exceed 150°C. The main part specification allows operation to 175°C. Applications operating near or above 150°C require thermal analysis to confirm SDURD1040 compatibility.

Q: Why is RR601BM4STL not recommended as a substitute?

A: RR601BM4STL has a maximum current rating of 6 A, which is insufficient for applications requiring the 10 A rectified current capacity of STTH10R04B. Additionally, its standard recovery speed classification (>500ns) differs from the fast recovery requirement (≤500ns) of the main part.

Q: What is the significance of the SDURD1040CT diode array configuration?

A: SDURD1040CT contains two diodes in a common cathode configuration within a single DPAK package. This topology is fundamentally different from the single-diode STTH10R04B and is suitable only for circuits specifically designed to utilize a common cathode diode pair. It is not a direct functional replacement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. STTH10R04B, SDURD1040, SDURD1040CT, and RR601BM4STL are all ROHS3 compliant, ensuring regulatory compatibility for applications subject to RoHS requirements.

Q: How does the 45 ns reverse recovery time of SDURD1040 compare to the 40 ns specification of STTH10R04B?

A: The 5 ns difference in reverse recovery time is within typical manufacturing tolerances for fast recovery diodes. This variance has minimal impact on circuit performance in most applications. Applications with stringent switching speed requirements should conduct circuit simulation or testing to confirm compatibility.

Q: What is the impact of the forward voltage difference between STTH10R04B (1.7 V @ 10 A) and SDURD1040 (1.5 V @ 10 A)?

A: The 0.2 V reduction in forward voltage of SDURD1040 results in lower power dissipation and improved efficiency. This represents a performance improvement over the main part and is generally beneficial in rectifier applications.

Q: Can SDURD1040 and SDURD1040CT be used interchangeably?

A: No. SDURD1040 is a single diode, while SDURD1040CT is a diode array with common cathode configuration. These parts have different circuit topologies and are not interchangeable. Selection depends on the specific circuit requirements.

Q: What packaging considerations apply to these substitute parts?

A: All substitute parts use the TO-252-3, DPAK (2 Leads + Tab), SC-63 package, identical to STTH10R04B. PCB footprints and thermal management considerations remain unchanged during substitution.

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