BYT08PI-400RG Equivalent & Substitute Parts

Part Overview

The BYT08PI-400RG is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 8 A average rectified current in a TO-220AC insulated through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting the same packaging and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 8 A
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	15	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2 Insulated, TO-220AC	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution eligibility for the BYT08PI-400RG is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 8 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-2 or TO-220AC compatible
Technology: Standard rectifier diode

Performance Compatibility Criteria:

Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.5 V @ 8 A
Reverse Recovery Time (trr): Must not exceed 75 ns
Current - Reverse Leakage @ Vr: Must not exceed 15 µA @ 400 V
Operating Temperature - Junction: Must support minimum 150°C

Compliance Requirements:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed below satisfy these criteria and are classified as active products, providing improved availability compared to the obsolete BYT08PI-400RG.

Parameter Comparison

Parameter	BYT08PI-400RG	STTH8R04DI	STTH8R04D	SDUR840
Manufacturer	STMicroelectronics	STMicroelectronics	STMicroelectronics	SMC Diode Solutions
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	8 A	8 A	8 A	8 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 8 A	1.5 V @ 8 A	1.5 V @ 8 A	1.3 V @ 8 A
Reverse Recovery Time (trr)	75 ns	50 ns	50 ns	45 ns
Current - Reverse Leakage @ Vr	15 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Insulated, TO-220AC	TO-220-2 Insulated, TO-220AC	TO-220-2	TO-220-2
Operating Temperature - Junction	150°C (Max)	-40°C ~ 175°C	-40°C ~ 175°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	1006 Pcs New Original In Stock	49100 Pcs New Original In Stock	1510 Pcs New Original In Stock	1935 Pcs New Original In Stock

Engineering Selection Recommendations

STTH8R04DI (Direct Equivalent - Preferred)

The STTH8R04DI is the primary substitute for the BYT08PI-400RG. This part is manufactured by STMicroelectronics and maintains identical electrical specifications while offering superior performance characteristics. The reverse recovery time is reduced from 75 ns to 50 ns, and reverse leakage current is improved from 15 µA to 10 µA. The operating temperature range extends to 175°C, exceeding the original specification. The part is classified as active with substantial inventory availability (49,100 units). All compliance certifications match the original part, including ROHS3 compliance and MSL 1 rating. The TO-220AC insulated package provides direct mechanical compatibility.

STTH8R04D (Alternative - STMicroelectronics)

The STTH8R04D serves as a secondary substitute from STMicroelectronics. Electrical specifications are identical to STTH8R04DI, with matching 50 ns reverse recovery time and 10 µA reverse leakage current. The operating temperature range is -40°C to 175°C. The primary distinction is the package designation (TO-220-2 versus TO-220AC insulated), which may require mechanical verification for specific board layouts. This part is active with 1,510 units in stock. ROHS3 compliance and MSL 1 rating are maintained.

SDUR840 (Cross-Manufacturer Alternative - SMC Diode Solutions)

The SDUR840 provides a cross-manufacturer substitute from SMC Diode Solutions. This part meets all mandatory electrical criteria with 400 V reverse voltage and 8 A current rating. The forward voltage is improved at 1.3 V @ 8 A, and reverse recovery time is optimized at 45 ns. Reverse leakage current matches substitute specifications at 10 µA @ 400 V. The operating temperature range is -55°C to 150°C, which meets the original maximum junction temperature requirement. The part is active with 1,935 units in stock. ROHS3 compliance and MSL 1 rating apply. REACH status is listed as affected, which may require additional documentation for certain regulatory jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can STTH8R04DI be used as a direct replacement for BYT08PI-400RG?

A: Yes. The STTH8R04DI meets or exceeds all electrical specifications of the BYT08PI-400RG, including voltage rating (400 V), current rating (8 A), forward voltage (1.5 V @ 8 A), and reverse recovery time (50 ns versus 75 ns). The TO-220AC insulated package provides mechanical compatibility. The part is active and widely available.

Q: What is the difference between STTH8R04DI and STTH8R04D?

A: Both parts are manufactured by STMicroelectronics and share identical electrical specifications. The primary difference is the package designation: STTH8R04DI specifies TO-220AC insulated, while STTH8R04D specifies TO-220-2. Both are through-hole packages compatible with standard TO-220 footprints. Verify package requirements for your specific application.

Q: Is SDUR840 suitable for applications requiring extended temperature operation?

A: The SDUR840 operates from -55°C to 150°C, which covers the original BYT08PI-400RG maximum junction temperature of 150°C. However, the upper temperature limit does not extend beyond the original specification. For applications requiring operation above 150°C, STTH8R04DI or STTH8R04D are preferred, as both support 175°C maximum junction temperature.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. STTH8R04DI, STTH8R04D, and SDUR840 are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original BYT08PI-400RG compliance profile.

Q: What is the significance of improved reverse recovery time in substitute parts?

A: The substitute parts feature reduced reverse recovery time (50 ns for STMicroelectronics parts, 45 ns for SDUR840) compared to the original 75 ns specification. This improvement reduces switching losses and electromagnetic interference in rectification circuits, providing enhanced performance in high-frequency applications.

Q: Does SDUR840 have any regulatory considerations?

A: SDUR840 is listed as REACH Affected, whereas the original BYT08PI-400RG and STMicroelectronics substitutes are REACH Unaffected. Applications subject to REACH compliance requirements should verify documentation with the supplier before selection.

Q: Can these parts be used interchangeably in existing PCB designs?

A: STTH8R04DI and STTH8R04D are mechanically compatible with standard TO-220 through-hole footprints. SDUR840 is also TO-220-2 compatible. Verify that your PCB layout accommodates the specific package variant selected. All three parts are electrically interchangeable within the specified parameter ranges.

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