STTA806DI Equivalent & Substitute Parts

Part Overview

The STTA806DI is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 8 A average rectified current in a TO-220AC insulated through-hole package. This component belongs to the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 52 ns.

The STTA806DI is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this diode specification is required.

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)	-
Mounting Type	Through Hole	-
Package / Case	TO-220-2 Insulated, TO-220AC	-
Operating Temperature - Junction (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the STTA806DI 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 or TO-220AC compatible
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature - Junction: 150°C maximum
Reverse Recovery Time (trr): ≤ 52 ns preferred
Voltage - Forward (Vf) (Max) @ If: ≤ 1.75 V @ 8 A preferred

Substitute parts are grouped into two categories:

Category A - Direct Current Rating Match (8 A): Parts meeting or exceeding the 8 A current specification with 600 V voltage rating and compatible TO-220AC packaging. These provide the closest functional equivalence.

Category B - Reduced Current Rating (3 A to 6 A): Parts with lower current ratings but identical voltage specifications and package compatibility. These are suitable for applications where the full 8 A capacity is not required.

Parameter Comparison

Parameter	STTA806DI	MUR860-BP	SDUR860	LXA06T600	LQA03TC600	QH03TZ600
Manufacturer	STMicroelectronics	Micro Commercial Co	SMC Diode Solutions	Power Integrations	Power Integrations	Power Integrations
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	8 A	8 A	-	6 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 8 A	1.5 V @ 8 A	1.7 V @ 8 A	2.94 V @ 6 A	3.1 V @ 3 A	3 V @ 3 A
Reverse Recovery Time (trr)	52 ns	50 ns	50 ns	23 ns	13 ns	9.8 ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	250 µA @ 600 V	20 µA @ 600 V	250 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Insulated, TO-220AC	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct 8 A Rating Match):

MUR860-BP (Micro Commercial Co) is the preferred direct substitute for the STTA806DI. This part maintains the 8 A current rating and 600 V voltage specification with identical TO-220AC packaging. The MUR860-BP features a lower forward voltage drop (1.5 V @ 8 A versus 1.75 V @ 8 A) and comparable reverse recovery time (50 ns versus 52 ns). The part is currently in active production status with 26,810 units in stock. Operating temperature range extends to -55°C, providing broader thermal operating margins.

SDUR860 (SMC Diode Solutions) provides an alternative 8 A rated substitute with 600 V specification and TO-220AC compatibility. Forward voltage is specified at 1.7 V @ 8 A with 50 ns reverse recovery time. This part is ROHS3 compliant and currently active. However, current rating is not explicitly specified in available documentation. Operating temperature range is -55°C to 150°C.

Secondary Substitutes (Reduced Current Rating):

LXA06T600 (Power Integrations, Qspeed™ series) is suitable for applications where 6 A capacity is sufficient. This part maintains 600 V voltage rating and TO-220AC packaging with faster reverse recovery time (23 ns). RoHS compliance is confirmed. Inventory availability is 8,111 units.

LQA03TC600 and QH03TZ600 (both Power Integrations, Qspeed™ series) are 3 A rated alternatives for lower current applications. Both maintain 600 V voltage specification and TO-220AC packaging with significantly faster reverse recovery times (13 ns and 9.8 ns respectively). Both are RoHS compliant and currently active. These parts are suitable only where circuit design permits reduced current capacity.

Compliance Considerations:

The STTA806DI is RoHS non-compliant. All recommended substitutes except MUR860-BP (compliance not specified) are RoHS compliant or ROHS3 compliant, supporting modern manufacturing and environmental standards. REACH status is unaffected for all parts listed.

Frequently Asked Questions (FAQ)

Q: Can MUR860-BP directly replace STTA806DI without circuit modification?

A: Yes. MUR860-BP meets all critical electrical parameters: 600 V reverse voltage, 8 A average rectified current, fast recovery characteristics, and TO-220AC through-hole packaging. Forward voltage is lower (1.5 V versus 1.75 V), which reduces power dissipation. Reverse recovery time is comparable (50 ns versus 52 ns). No circuit modification is required.

Q: What is the difference between the 8 A rated substitutes (MUR860-BP and SDUR860)?

A: Both parts maintain 8 A current rating and 600 V voltage specification. MUR860-BP specifies forward voltage at 1.5 V @ 8 A with lower reverse leakage (5 µA). SDUR860 specifies forward voltage at 1.7 V @ 8 A, also with 5 µA reverse leakage. MUR860-BP has documented compliance status, while SDUR860 compliance is partially specified. Both have 50 ns reverse recovery time.

Q: Can I use LXA06T600 (6 A) instead of STTA806DI (8 A)?

A: LXA06T600 is suitable only if circuit design permits operation at 6 A maximum current. The 600 V voltage rating and TO-220AC packaging are compatible. This substitution reduces current capacity by 25% and is appropriate for applications with lower current requirements or where thermal management is improved by reduced power dissipation.

Q: Why are the 3 A rated parts (LQA03TC600 and QH03TZ600) listed as substitutes?

A: These parts are listed as substitutes for applications where current requirements do not exceed 3 A. They maintain 600 V voltage specification and TO-220AC packaging compatibility. The significantly faster reverse recovery times (13 ns and 9.8 ns) provide performance advantages in high-frequency switching applications. These parts are not suitable for circuits requiring the full 8 A capacity.

Q: What is the impact of forward voltage differences between substitutes?

A: Forward voltage differences directly affect power dissipation in the diode. MUR860-BP at 1.5 V @ 8 A dissipates less power than STTA806DI at 1.75 V @ 8 A. This results in lower junction temperature and reduced thermal stress. Lower forward voltage is generally advantageous for efficiency and thermal management.

Q: Are all substitutes RoHS compliant?

A: MUR860-BP compliance status is not specified in available documentation. SDUR860 is ROHS3 compliant. LXA06T600, LQA03TC600, and QH03TZ600 are all RoHS compliant. The original STTA806DI is RoHS non-compliant. For applications requiring RoHS compliance, MUR860-BP should be verified with the manufacturer before selection.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference characteristics. STTA806DI has 52 ns trr. MUR860-BP and SDUR860 have 50 ns (comparable). LXA06T600, LQA03TC600, and QH03TZ600 have significantly faster recovery times (23 ns, 13 ns, and 9.8 ns respectively). Faster recovery reduces switching losses and EMI in high-frequency applications but is not required for standard rectification circuits.

Q: Can I mix different substitute parts in the same circuit?

A: All listed substitutes are compatible with TO-220AC through-hole mounting and 600 V operation. However, mixing parts with different current ratings (8 A, 6 A, and 3 A) in parallel or series configurations requires careful circuit analysis to ensure proper current distribution and voltage sharing. Identical part numbers are recommended for parallel or series configurations.

Q: What inventory considerations apply to these substitutes?

A: MUR860-BP has the highest inventory availability (26,810 units). STTA806DI has 1,450 units remaining as obsolete stock. LXA06T600 has 8,111 units, LQA03TC600 has 16,921 units, SDUR860 has 1,745 units, and QH03TZ600 has 2,100 units. For long-term production requirements, MUR860-BP, LQA03TC600, and LXA06T600 offer the most reliable supply continuity.

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