STTH806D Equivalent & Substitute Parts

Part Overview

The STTH806D is a general-purpose fast recovery rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 8 A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, indicating that direct replacement with an active equivalent is necessary for new designs and ongoing production requirements. The diode features a 55 ns reverse recovery time and is suitable for standard rectification applications requiring fast switching characteristics.

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	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the STTH806D is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 8 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-2 (TO-220AC supplier package)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature - Junction: 175°C or higher preferred for thermal margin
RoHS Status: ROHS3 Compliant or RoHS Compliant
Reverse Recovery Time (trr): Lower values indicate improved switching performance
Forward Voltage (Vf): Lower values reduce power dissipation

Substitute parts are grouped into two categories:

Direct Equivalent (Recommended Manufacturer Substitute): STTH8L06D from STMicroelectronics meets all primary criteria with identical voltage and current ratings, same package, and active product status.

Similar Alternatives (Cross-Manufacturer Substitutes): Parts from IXYS, Power Integrations, and SMC Diode Solutions that meet the 600 V / 8 A minimum requirements with TO-220AC packaging. These include current ratings from 5 A to 20 A, accommodating applications with varying current demands while maintaining voltage compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	RoHS Status
STTH806D	STMicroelectronics	600	8	1.85 @ 8 A	55	8 @ 600 V	175	Obsolete	ROHS3 Compliant
STTH8L06D	STMicroelectronics	600	8	1.3 @ 8 A	105	8 @ 600 V	175	Active	ROHS3 Compliant
BYV29-600,127	WeEn Semiconductors	600	9	1.25 @ 8 A	60	50 @ 600 V	150	Active	RoHS Compliant
DHG10I600PA	IXYS	600	10	2.35 @ 10 A	35	15 @ 600 V	150	Active	ROHS3 Compliant
DHG20I600PA	IXYS	600	20	2.32 @ 20 A	35	30 @ 600 V	150	Active	ROHS3 Compliant
DHG5I600PA	IXYS	600	5	2.2 @ 5 A	35	10 @ 600 V	150	Active	ROHS3 Compliant
DSEI8-06A	IXYS	600	8	1.5 @ 8 A	50	20 @ 600 V	150	Active	ROHS3 Compliant
DSEP8-06B	IXYS	600	10	2.66 @ 10 A	30	60 @ 600 V	175	Active	ROHS3 Compliant
QH08TZ600	Power Integrations	600	8	3.15 @ 8 A	11.1	250 @ 600 V	150	Active	RoHS Compliant
SDUR860	SMC Diode Solutions	600	-	1.7 @ 8 A	50	5 @ 600 V	150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: STTH8L06D

The STTH8L06D from STMicroelectronics is the manufacturer-recommended direct equivalent. It maintains identical voltage (600 V) and current (8 A) ratings, same TO-220AC package, and active product status. The lower forward voltage (1.3 V vs. 1.85 V) provides reduced power dissipation. Both parts carry ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This selection eliminates cross-manufacturer compatibility concerns and maintains design continuity within the STMicroelectronics product family.

Secondary Recommendation: DSEI8-06A (IXYS FRED Series)

The DSEI8-06A provides an 8 A rated alternative with 600 V reverse voltage in TO-220AC packaging. It features a 50 ns reverse recovery time and 1.5 V forward voltage, offering performance characteristics between the original STTH806D and the STTH8L06D. ROHS3 compliance and active product status support long-term availability. The FRED series designation indicates optimized fast recovery characteristics suitable for standard rectification applications.

Alternative Selections for Current Margin Requirements:

DHG10I600PA or DHG20I600PA (IXYS): For applications requiring current margin above 8 A, these 10 A and 20 A rated alternatives maintain 600 V reverse voltage and TO-220AC packaging with ROHS3 compliance and active status. Higher current ratings provide design headroom for thermal or load variation scenarios.
BYV29-600,127 (WeEn Semiconductors): Offers 9 A current rating with 600 V reverse voltage and improved forward voltage characteristics (1.25 V @ 8 A). Active product status and RoHS compliance support production continuity.

Compliance Verification:

All recommended substitutes maintain ROHS3 or RoHS compliance status. The STTH8L06D and DSEI8-06A are preferred for new designs due to active product status and established supply chain availability. REACH compliance status is consistent across all recommended alternatives.

Frequently Asked Questions (FAQ)

Q: Can STTH8L06D directly replace STTH806D in existing designs?

A: Yes. The STTH8L06D maintains identical voltage (600 V) and current (8 A) ratings, same TO-220AC package, and operating temperature maximum (175°C). The lower forward voltage (1.3 V vs. 1.85 V) reduces power dissipation, providing improved thermal performance. No circuit modifications are required.

Q: What is the difference between the STTH806D and STTH8L06D reverse recovery times?

A: The STTH806D has a 55 ns reverse recovery time, while the STTH8L06D has a 105 ns reverse recovery time. The longer recovery time in the STTH8L06D results from different semiconductor processing. For most standard rectification applications, both values fall within the fast recovery classification (≤ 500ns). Applications with critical switching frequency requirements should verify compatibility with circuit timing specifications.

Q: Are IXYS DHG series diodes suitable replacements for 8 A applications?

A: IXYS DHG series diodes with 10 A or higher ratings (DHG10I600PA, DHG20I600PA) are suitable for 8 A applications, providing current margin. These parts maintain 600 V reverse voltage and TO-220AC packaging. However, forward voltage is higher (2.2 to 2.35 V), resulting in increased power dissipation compared to the STTH806D or STTH8L06D. Selection depends on thermal design constraints and available heatsinking.

Q: What is the significance of the TO-220AC package designation?

A: TO-220AC indicates a two-lead through-hole package with isolated mounting tab (AC variant). All recommended substitutes use this identical package, ensuring mechanical and thermal interface compatibility. The isolated tab prevents electrical connection to the mounting surface, critical for applications requiring electrical isolation between the diode and heatsink.

Q: Why does the SDUR860 show no current rating in the specifications?

A: The SDUR860 specifications provided do not include a rated average rectified current value. However, the forward voltage specification (1.7 V @ 8 A) indicates 8 A operation capability. Verification with the manufacturer datasheet is necessary to confirm full electrical specifications before selection for production applications.

Q: Can QH08TZ600 replace STTH806D despite higher forward voltage?

A: The QH08TZ600 maintains 600 V reverse voltage and 8 A current rating in TO-220AC packaging, meeting primary substitution criteria. However, the significantly higher forward voltage (3.15 V vs. 1.85 V) results in substantially increased power dissipation and heat generation. The extremely fast reverse recovery time (11.1 ns) indicates specialized switching characteristics. Selection requires thermal analysis and verification that the application can accommodate the higher power loss.

Q: What compliance certifications are critical for production applications?

A: ROHS3 compliance is mandatory for most production applications in regulated markets. All recommended substitutes carry either ROHS3 or RoHS compliance status. REACH compliance status varies; the SDUR860 is listed as REACH Affected, requiring additional regulatory verification for specific end-use applications. Consult regional regulatory requirements and customer specifications before final selection.

Q: How does operating temperature rating affect part selection?

A: The STTH806D and STTH8L06D both support 175°C maximum junction temperature, providing thermal margin for high-power applications. Most IXYS alternatives (DHG series, DSEI8-06A) are rated to 150°C maximum, reducing thermal headroom by 25°C. Applications operating near thermal limits should prioritize the 175°C rated alternatives. The DSEP8-06B (HiPerFRED™ series) also supports 175°C, providing an alternative for thermally constrained designs.

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