STTH10R04D Equivalent & Substitute Parts

Part Overview

The STTH10R04D is a general-purpose fast recovery rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 10 A average rectified current in a TO-220AC package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

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	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the STTH10R04D is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 10 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-2 or TO-220AC compatible
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature - Junction: -55°C to 175°C range
RoHS3 Compliance
Reverse Recovery Time (trr): ≤ 60 ns
Forward Voltage (Vf): ≤ 1.7 V @ rated current

Substitute parts are grouped into two categories: Direct Equivalents (matching 10 A current rating) and Uprated Alternatives (exceeding 10 A current rating while maintaining 400 V voltage specification).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Tj (Max) [°C]
STTH10R04D	STMicroelectronics	400	10	1.7 @ 10 A	40	10 @ 400 V	TO-220AC	Obsolete	175
DPG10I400PA	IXYS	400	10	1.32 @ 10 A	45	1 @ 400 V	TO-220AC	Active	175
MUR840-BP	Micro Commercial Co	400	8	1.3 @ 8 A	50	5 @ 400 V	TO-220AC	Active	150
MUR840G	onsemi	400	8	1.3 @ 8 A	60	10 @ 400 V	TO-220-2	Active	175
MUR1540G	onsemi	400	15	1.25 @ 15 A	60	10 @ 400 V	TO-220-2	Active	175
SDUR1040	SMC Diode Solutions	400	-	1.3 @ 10 A	45	10 @ 400 V	TO-220AC	Active	150

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The DPG10I400PA from IXYS is the optimal direct equivalent for the STTH10R04D. This part maintains identical voltage (400 V) and current (10 A) ratings, shares the same TO-220AC package configuration, and is classified as Active product status. The DPG10I400PA demonstrates superior electrical performance with lower forward voltage (1.32 V vs. 1.7 V @ 10 A) and reduced reverse leakage current (1 µA vs. 10 µA @ 400 V). Both parts are ROHS3 compliant and operate across the same maximum junction temperature (175°C). This substitution requires no circuit redesign or thermal management modifications.

Uprated Alternative (Higher Current Capacity):

The MUR1540G from onsemi provides a 15 A current rating while maintaining the 400 V voltage specification. This uprated substitute is suitable for applications where design margin or future current demand expansion is required. The MUR1540G is Active product status, ROHS3 compliant, and operates to 175°C maximum junction temperature. The TO-220-2 package is mechanically compatible with TO-220AC footprints. Selection of this part introduces additional thermal headroom and current capacity without voltage or temperature compromises.

Current-Limited Alternatives (Lower Current Capacity):

The MUR840G and MUR840-BP are rated for 8 A average rectified current, below the 10 A specification of the STTH10R04D. These parts are suitable only for applications where the actual operating current does not exceed 8 A. Both maintain 400 V voltage rating and fast recovery characteristics. The MUR840G (onsemi) is preferred over MUR840-BP due to higher maximum junction temperature (175°C vs. 150°C) and ROHS3 compliance.

Conditional Substitute (Incomplete Specification):

The SDUR1040 from SMC Diode Solutions is classified as Active and provides 400 V voltage rating with 1.3 V forward voltage @ 10 A. However, the average rectified current (Io) specification is not provided in the available data. This part is suitable only when current rating can be independently verified against application requirements. REACH Status is listed as Affected, requiring compliance verification for specific end-use applications.

Frequently Asked Questions (FAQ)

Q: Can the DPG10I400PA directly replace the STTH10R04D without circuit modifications?

A: Yes. The DPG10I400PA is a direct equivalent with identical voltage (400 V) and current (10 A) ratings, matching package configuration (TO-220AC), and equivalent operating temperature range (175°C maximum). No circuit redesign is required. The lower forward voltage of the DPG10I400PA (1.32 V vs. 1.7 V) results in reduced power dissipation, which is a favorable characteristic.

Q: Why is the MUR1540G listed as a substitute if it has a higher current rating (15 A vs. 10 A)?

A: The MUR1540G maintains the critical voltage specification (400 V) and package compatibility (TO-220-2 is mechanically compatible with TO-220AC). Higher current rating does not prevent substitution; it provides additional design margin. Applications operating at 10 A or below can safely use the MUR1540G. This substitution is appropriate when component availability or thermal performance improvements are prioritized.

Q: Are MUR840G and MUR840-BP suitable substitutes for the STTH10R04D?

A: These parts are suitable only for applications where actual operating current does not exceed 8 A. The STTH10R04D is rated for 10 A average rectified current; MUR840G and MUR840-BP are rated for 8 A. If the application requires the full 10 A capability, these parts are not appropriate substitutes. If the application operates below 8 A, these parts are acceptable alternatives.

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

A: Both designations refer to the same physical package: a three-lead through-hole component with a metal mounting tab. TO-220AC and TO-220-2 are equivalent package specifications. Parts specified with either designation are mechanically and electrically interchangeable in TO-220 footprints.

Q: Does the SDUR1040 have a specified current rating?

A: The average rectified current (Io) specification for the SDUR1040 is not provided in the available technical data. The forward voltage is specified at 10 A (1.3 V @ 10 A), suggesting a 10 A or higher rating, but this cannot be confirmed from the provided parameters. Independent verification of the current rating is required before selection.

Q: What is the significance of the lower reverse leakage current in the DPG10I400PA (1 µA vs. 10 µA)?

A: Lower reverse leakage current indicates reduced off-state current flow, which improves efficiency and reduces heat generation during reverse bias operation. This is a favorable characteristic that does not affect substitution suitability but provides performance benefits in the application.

Q: Is RoHS3 compliance required for all substitute parts?

A: RoHS3 compliance is specified for the STTH10R04D and most substitute parts (DPG10I400PA, MUR840G, MUR1540G, SDUR1040). If RoHS3 compliance is a requirement for your application, verify that the selected substitute part carries ROHS3 Compliant status. The MUR840-BP does not list RoHS status in the provided data.

Q: Can the STTH10R04D be used in new designs, or is substitution mandatory?

A: The STTH10R04D is classified as Obsolete, indicating discontinuation from STMicroelectronics. New designs should not incorporate obsolete components. Existing designs using the STTH10R04D should transition to an active substitute part, with DPG10I400PA recommended as the primary alternative.

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