STTH3006D Equivalent & Substitute Parts

Part Overview

The STTH3006D is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 30 A average rectified current in a TO-220AC through-hole package. Manufactured by STMicroelectronics, this component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part is ROHS3 compliant and carries unlimited moisture sensitivity level rating.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	30	A
Voltage - Forward (Vf) (Max) @ If	1.85 @ 30 A	V
Reverse Recovery Time (trr)	70	ns
Current - Reverse Leakage @ Vr	25	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 STTH3006D is determined by matching the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 30 A
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Status: ROHS3 Compliant

Package Compatibility: Substitutes are grouped by package type. The STTH3006D uses TO-220AC (TO-220-2 straight leads). Equivalent parts may use alternative through-hole packages such as DO-247, provided electrical ratings remain identical.

Secondary Considerations: Forward voltage (Vf), reverse recovery time (trr), and reverse leakage current are secondary parameters that may vary within acceptable ranges for the application. Parts with lower forward voltage or faster recovery times represent performance improvements. Reverse leakage current variations are acceptable within the specified operating conditions.

Parameter Comparison

Parameter	STTH3006D (Main)	STTH3006W	DSEP29-06A	DSEP29-06B	SDUR30Q60
Manufacturer	STMicroelectronics	STMicroelectronics	IXYS	IXYS	SMC Diode Solutions
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	30 A	30 A	30 A	30 A	30 A
Voltage - Forward (Vf) (Max) @ If	1.85 V @ 30 A	1.85 V @ 30 A	1.61 V @ 30 A	2.52 V @ 30 A	1.8 V @ 30 A
Reverse Recovery Time (trr)	70 ns	70 ns	35 ns	30 ns	40 ns
Current - Reverse Leakage @ Vr	25 µA @ 600 V	25 µA @ 600 V	250 µA @ 600 V	250 µA @ 600 V	10 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	DO-247-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C	150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STTH3006W (STMicroelectronics)

The STTH3006W is the primary substitute for the STTH3006D. Both parts are manufactured by STMicroelectronics and share identical electrical specifications: 600 V reverse voltage, 30 A average rectified current, 1.85 V forward voltage at 30 A, and 70 ns reverse recovery time. The STTH3006W is in active product status, ensuring long-term availability. The primary difference is the package format: STTH3006W uses DO-247-2 (straight leads) instead of TO-220AC. Both packages are through-hole mounted and mechanically compatible with standard PCB layouts. ROHS3 compliance and unlimited moisture sensitivity level are maintained. This part is recommended for direct replacement where package footprint accommodation is feasible.

DSEP29-06A (IXYS HiPerFRED™ Series)

The DSEP29-06A is an active substitute manufactured by IXYS in the HiPerFRED™ series. It maintains the 600 V / 30 A electrical ratings and TO-220AC package compatibility with the STTH3006D. The DSEP29-06A offers improved performance characteristics: lower forward voltage (1.61 V vs. 1.85 V) and faster reverse recovery time (35 ns vs. 70 ns). Reverse leakage current is higher at 250 µA compared to 25 µA. Operating temperature range extends to -55°C minimum. ROHS3 compliance is maintained. This part is suitable for applications where reduced switching losses and faster recovery are beneficial.

DSEP29-06B (IXYS HiPerFRED™ Series)

The DSEP29-06B is an active substitute from IXYS, also in the HiPerFRED™ series, with identical voltage and current ratings and TO-220AC package compatibility. This variant exhibits the fastest reverse recovery time (30 ns) among all substitutes. Forward voltage is higher at 2.52 V, resulting in increased conduction losses. Reverse leakage current is 250 µA. Operating temperature range is -55°C to 175°C. ROHS3 compliance is maintained. Selection of this part is appropriate for applications prioritizing minimal reverse recovery time over forward voltage performance.

SDUR30Q60 (SMC Diode Solutions)

The SDUR30Q60 is an active substitute from SMC Diode Solutions with matching 600 V / 30 A ratings and TO-220AC package compatibility. Forward voltage is 1.8 V, closely aligned with the STTH3006D. Reverse recovery time is 40 ns, representing moderate improvement. Reverse leakage current is the lowest among all substitutes at 10 µA. Operating temperature maximum is 150°C, which is 25°C lower than the STTH3006D. ROHS compliance status is ROHS3 Affected. This part is suitable for applications where low reverse leakage is critical and the reduced maximum junction temperature is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the STTH3006W (DO-247 package) be used as a direct replacement for the STTH3006D (TO-220AC package)?

A: The STTH3006W is electrically equivalent to the STTH3006D with identical voltage, current, and thermal ratings. Both are through-hole mounted packages. Physical footprint differences exist between DO-247-2 and TO-220-2 packages. PCB layout modification may be required to accommodate the different lead configuration and spacing. Mechanical compatibility with the application's mounting structure must be verified.

Q: What is the significance of the forward voltage differences among the substitute parts?

A: Forward voltage (Vf) directly affects conduction losses in the diode. Lower forward voltage reduces power dissipation and heat generation. The DSEP29-06A exhibits the lowest forward voltage (1.61 V), while the DSEP29-06B exhibits the highest (2.52 V). Selection depends on thermal management requirements and efficiency targets. All parts meet the 600 V / 30 A electrical specification regardless of forward voltage variation.

Q: Why do some substitutes have higher reverse leakage current?

A: Reverse leakage current (Ir) is the small current flowing through the diode in the reverse-biased state. The DSEP29-06A and DSEP29-06B exhibit 250 µA at 600 V, compared to 25 µA for the STTH3006D and 10 µA for the SDUR30Q60. Higher leakage current increases standby power consumption. Applications with stringent standby power requirements should prioritize parts with lower reverse leakage, such as the SDUR30Q60.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This classification indicates the diode's switching speed category. All listed parts meet this fast recovery specification, meaning reverse recovery time is less than or equal to 500 nanoseconds at currents exceeding 200 mA. Faster recovery times (lower trr values) reduce switching losses and electromagnetic interference in high-frequency applications. The DSEP29-06B offers the fastest recovery at 30 ns.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The SDUR30Q60 carries a ROHS Affected status, indicating it is compliant but subject to ROHS regulations. This does not affect electrical or mechanical compatibility. All parts are suitable for applications requiring ROHS compliance.

Q: What is the impact of the operating temperature difference in the SDUR30Q60?

A: The SDUR30Q60 has a maximum junction temperature of 150°C, compared to 175°C for the STTH3006D and other substitutes. This 25°C difference reduces the thermal margin available for the application. In high-temperature environments or applications with significant power dissipation, the SDUR30Q60 may reach its maximum rating sooner than alternative substitutes. Thermal analysis is required to confirm suitability.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: All substitute parts meet the mandatory electrical specifications (600 V, 30 A, fast recovery, through-hole mounting, ROHS3 compliance). However, differences in forward voltage, reverse recovery time, reverse leakage current, and maximum junction temperature create performance variations. Interchangeability within a single design is feasible only if the application's thermal, efficiency, and leakage requirements accommodate the specific part's characteristics. Design validation is required for each substitution.

Q: What is the difference between TO-220AC and DO-247 packages?

A: Both are through-hole mounted packages for power semiconductors. TO-220AC (TO-220-2 straight leads) features two leads in a standard TO-220 outline. DO-247-2 (straight leads) is a larger package with improved thermal performance and different lead spacing. Lead-to-lead distance, mounting hole diameter, and PCB footprint differ between the two. Physical compatibility with the application's PCB layout and mounting hardware must be verified before substitution.

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