STTA806G Equivalent & Substitute Parts

Part Overview

The STTA806G is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 8 A average rectified current in a D2PAK surface mount package. This device is part of the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 52 ns.

The STTA806G is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 8 A	V
Reverse Recovery Time (trr)	52	ns
Current - Reverse Leakage @ Vr	100	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the STTA806G is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Criteria:

Current - Average Rectified (Io): Equal to or greater than 8 A
Voltage - Forward (Vf) (Max) @ If: Within acceptable circuit operating margins
Reverse Recovery Time (trr): Within fast recovery specification
Current - Reverse Leakage @ Vr: Within acceptable leakage limits
Operating Temperature - Junction (Max): Equal to or greater than 150°C

Substitute parts must satisfy all mandatory matching criteria and fall within allowable variation ranges to ensure electrical and mechanical compatibility with the original STTA806G application.

Parameter Comparison

Parameter	STTA806G	STTH806G-TR	BYV29B-600,118	VS-ETL1506S-M3	VS-ETL1506STRLHM3
Manufacturer	STMicroelectronics	STMicroelectronics	WeEn Semiconductors	Vishay General Semiconductor	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	8 A	8 A	9 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 8 A	1.85 V @ 8 A	1.25 V @ 8 A	1.07 V @ 15 A	1.07 V @ 15 A
Reverse Recovery Time (trr)	52 ns	55 ns	60 ns	210 ns	210 ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	8 µA @ 600 V	50 µA @ 600 V	15 µA @ 600 V	15 µA @ 600 V
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature - Junction (Max)	150°C	175°C	150°C	175°C	175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

STTH806G-TR (STMicroelectronics)

The STTH806G-TR is the direct active equivalent to the obsolete STTA806G. Both devices are manufactured by STMicroelectronics and share identical voltage and current ratings with the same D2PAK package. The STTH806G-TR features improved reverse leakage characteristics (8 µA versus 100 µA) and an elevated maximum junction temperature rating (175°C versus 150°C). This part is actively produced and widely available. ROHS3 compliance and unlimited moisture sensitivity level are maintained. Selection of STTH806G-TR is recommended as the primary replacement for direct substitution.

BYV29B-600,118 (WeEn Semiconductors)

The BYV29B-600,118 is an active substitute with 600 V reverse voltage rating and D2PAK packaging. This device provides 9 A average rectified current, exceeding the 8 A requirement of the STTA806G. Forward voltage is lower at 1.25 V @ 8 A compared to 1.75 V, resulting in reduced power dissipation. Reverse recovery time is 60 ns, within fast recovery specification. Maximum junction temperature is 150°C, matching the original part. RoHS compliance and unlimited MSL are maintained. This part is suitable for applications where lower forward voltage drop is beneficial.

VS-ETL1506S-M3 and VS-ETL1506STRLHM3 (Vishay General Semiconductor)

Both Vishay parts (VS-ETL1506S-M3 and VS-ETL1506STRLHM3) are active substitutes with 600 V reverse voltage and D2PAK packaging. These devices provide 15 A average rectified current, significantly exceeding the 8 A requirement. Forward voltage is substantially lower at 1.07 V @ 15 A. Reverse recovery time is 210 ns, which exceeds the fast recovery specification of the original part. Maximum junction temperature is 175°C. The VS-ETL1506STRLHM3 includes automotive qualification (AEC-Q101) and is suitable for automotive applications. Both parts maintain ROHS3 compliance and unlimited MSL. Selection of these parts is appropriate for applications requiring higher current capacity or lower forward voltage, with consideration for the extended reverse recovery time.

Frequently Asked Questions (FAQ)

Q: Can the STTH806G-TR be used as a direct replacement for the STTA806G?

A: Yes. The STTH806G-TR is the active equivalent manufactured by STMicroelectronics. Both parts share identical voltage (600 V), current (8 A), and package specifications (D2PAK). The STTH806G-TR is actively produced and maintains full compatibility with applications designed for the STTA806G.

Q: What is the primary difference between the STTA806G and STTH806G-TR?

A: The STTH806G-TR is the active production version of the STTA806G. Key improvements include reduced reverse leakage current (8 µA versus 100 µA) and an elevated maximum junction temperature (175°C versus 150°C). Both devices maintain identical electrical performance for voltage and current ratings.

Q: Can I use the BYV29B-600,118 in place of the STTA806G?

A: Yes, with consideration for circuit design. The BYV29B-600,118 provides 9 A current capacity (exceeding the 8 A requirement) and features lower forward voltage (1.25 V @ 8 A versus 1.75 V). Both parts share the same 600 V rating and D2PAK package. The lower forward voltage may reduce power dissipation in the application.

Q: Why do the Vishay parts (VS-ETL1506S-M3 and VS-ETL1506STRLHM3) have longer reverse recovery times?

A: The Vishay parts are rated at 15 A current capacity with a reverse recovery time of 210 ns, compared to the STTA806G at 8 A with 52 ns. The extended reverse recovery time is a characteristic of the higher current rating design. Both remain within the fast recovery classification (≤ 500ns, > 200mA).

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts listed are available in the TO-263-3 D2PAK (2 Leads + Tab) surface mount package, matching the original STTA806G package specification. Packaging variations exist only in supplier delivery format (bulk, tape and reel, cut tape).

Q: Which substitute part should I select for automotive applications?

A: The VS-ETL1506STRLHM3 is qualified for automotive applications under AEC-Q101 standard. This part is suitable for automotive-grade designs requiring 600 V, 15 A rectification in D2PAK packaging.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed maintain RoHS compliance. The STTA806G, STTH806G-TR, VS-ETL1506S-M3, and VS-ETL1506STRLHM3 are ROHS3 compliant. The BYV29B-600,118 is RoHS compliant. All parts have unlimited moisture sensitivity level (MSL 1).

Q: What is the impact of selecting a higher current-rated substitute?

A: Selecting a higher current-rated substitute (such as the 15 A Vishay parts instead of the 8 A STTA806G) provides design margin and thermal headroom. The device will operate at lower stress levels within the same application. Forward voltage characteristics may differ, affecting power dissipation calculations. Reverse recovery time may be longer, which should be evaluated for switching frequency requirements.

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