STTH806G Equivalent & Substitute Parts

Part Overview

The STTH806G is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 8 A average rectified current in a surface mount D2PAK package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within the allowed parameter ranges for this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.85 @ 8 A	V
Reverse Recovery Time (trr)	55	ns
Current - Reverse Leakage @ Vr	8	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH806G is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 600 V
Current - Average Rectified (Io) must equal or exceed 8 A
Voltage - Forward (Vf) must not exceed specified maximum at rated current
Reverse Recovery Time (trr) must support fast recovery classification (≤ 500ns, > 200mA)
Current - Reverse Leakage must remain within acceptable limits

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Compliance Criteria:

RoHS Status: ROHS3 Compliant or equivalent
ECCN: EAR99
HTSUS: 8541.10.0080

Substitute parts are grouped into two categories: direct equivalents (identical specifications) and compatible substitutes (meeting or exceeding all critical parameters within the allowed range).

Parameter Comparison

Parameter	STTH806G	STTH806G-TR	BYV29B-600,118
Manufacturer	STMicroelectronics	STMicroelectronics	WeEn Semiconductors
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	8 A	8 A	9 A
Voltage - Forward (Vf) (Max) @ If	1.85 V @ 8 A	1.85 V @ 8 A	1.25 V @ 8 A
Reverse Recovery Time (trr)	55 ns	55 ns	60 ns
Current - Reverse Leakage @ Vr	8 µA @ 600 V	8 µA @ 600 V	50 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature - Junction (Max)	175°C	175°C	150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

STTH806G-TR (STMicroelectronics)

The STTH806G-TR is the direct equivalent of the obsolete STTH806G, offering identical electrical specifications and package configuration. This part is currently in active production status with significantly higher inventory availability (389,188 pcs). The STTH806G-TR maintains the same 600 V reverse voltage rating, 8 A average rectified current, 1.85 V forward voltage drop, and 55 ns reverse recovery time. The primary advantage is improved moisture sensitivity level (MSL 1 vs. MSL 3), providing superior shelf life and storage stability. This part is supplied in Cut Tape and Digi-Reel packaging formats. ROHS3 compliance and EAR99 classification are maintained. Direct substitution is supported without circuit modification.

BYV29B-600,118 (WeEn Semiconductors)

The BYV29B-600,118 is a compatible substitute offering enhanced performance characteristics. This part exceeds the STTH806G specifications in current capacity (9 A vs. 8 A) and provides a lower forward voltage drop (1.25 V @ 8 A vs. 1.85 V), resulting in reduced power dissipation. The 600 V reverse voltage rating and fast recovery classification (60 ns trr) remain compatible. The operating temperature maximum is rated at 150°C compared to 175°C for the STTH806G. This part is supplied in Tape & Reel packaging with MSL 1 rating. RoHS compliance and EAR99 classification are maintained. Substitution is supported for applications where the lower forward voltage drop and higher current capacity provide system-level benefits.

Frequently Asked Questions (FAQ)

Q: Can STTH806G-TR be used as a direct replacement for STTH806G?

A: Yes. The STTH806G-TR is electrically and mechanically identical to the STTH806G. Both parts share the same base product number (STTH806), voltage rating (600 V), current rating (8 A), forward voltage drop (1.85 V @ 8 A), and reverse recovery time (55 ns). The primary difference is product status (active vs. obsolete) and packaging format. Direct substitution requires no circuit modifications.

Q: What are the key differences between STTH806G and BYV29B-600,118?

A: The BYV29B-600,118 offers higher average rectified current (9 A vs. 8 A) and lower forward voltage drop (1.25 V @ 8 A vs. 1.85 V @ 8 A). Both maintain 600 V reverse voltage rating and fast recovery classification. The BYV29B-600,118 has a lower maximum junction temperature (150°C vs. 175°C) and higher reverse leakage current (50 µA @ 600 V vs. 8 µA @ 600 V). These differences must be evaluated against specific circuit requirements.

Q: Are all substitute parts available in the same D2PAK package?

A: Yes. All listed substitute parts (STTH806G-TR and BYV29B-600,118) are supplied in the TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package configuration. PCB footprint compatibility is maintained across all parts.

Q: What is the significance of the MSL rating difference?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. STTH806G has MSL 3 (168 hours), while STTH806G-TR and BYV29B-600,118 have MSL 1 (unlimited). Higher MSL ratings provide greater flexibility in storage, handling, and manufacturing processes without requiring baking procedures.

Q: Are all substitute parts RoHS compliant?

A: Yes. STTH806G-TR is ROHS3 compliant. BYV29B-600,118 is RoHS compliant. Both meet environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions.

Q: Can BYV29B-600,118 be used in applications requiring 175°C junction temperature operation?

A: No. The BYV29B-600,118 is rated for a maximum junction temperature of 150°C, which is 25°C lower than the STTH806G specification. Applications requiring sustained operation at temperatures above 150°C must use STTH806G-TR or equivalent parts with 175°C ratings.

Q: What is the impact of the forward voltage drop difference on circuit performance?

A: The BYV29B-600,118 forward voltage drop (1.25 V @ 8 A) is 0.6 V lower than the STTH806G (1.85 V @ 8 A). This results in reduced power dissipation and heat generation. For an 8 A circuit, this represents approximately 4.8 W less power loss per diode. Circuit thermal management and efficiency calculations must account for this difference.

Q: Are there packaging format differences between substitute parts?

A: Yes. STTH806G-TR is supplied in Cut Tape (CT) and Digi-Reel formats. BYV29B-600,118 is supplied in Tape & Reel (TR) format. Both formats are standard surface mount packaging suitable for automated assembly processes. Format selection depends on manufacturing equipment and procurement requirements.

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