STTH2006W Equivalent & Substitute Parts

Part Overview

The STTH2006W is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 20 A average rectified current in a DO-247 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The fast recovery characteristic (≤500 ns) and 70 ns reverse recovery time position this diode for applications requiring efficient switching performance in power conversion circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 20 A	V
Reverse Recovery Time (trr)	70	ns
Current - Reverse Leakage @ Vr	25 µA @ 600 V	µA
Speed Classification	Fast Recovery ≤500 ns, >200 mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-247-2 (Straight Leads)	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH2006W is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤500 ns, >200 mA (Io)
Technology: Standard

Current Rating Flexibility: The STTH2006W operates at 20 A average rectified current. Substitute parts with equal or higher current ratings (30 A, 37 A, 40 A, 50 A, 60 A, 77 A) are electrically compatible, as they maintain the same voltage class and switching characteristics while providing additional current capacity margin.

Package Compatibility: The original DO-247-2 package is compatible with substitute parts in TO-247-2 and TO-247AD packages, as these are mechanically and electrically interchangeable through-hole configurations. The ISOPLUS247™ package (DSEP30-06B) represents an alternative isolated package variant.

Reverse Recovery Time: Substitute parts with reverse recovery times ranging from 25 ns to 130 ns are acceptable, as all remain within the fast recovery classification and support the same application switching frequencies.

Reverse Leakage Current: Substitute parts with reverse leakage currents up to 650 µA @ 600 V are acceptable, as leakage variation does not affect primary rectification function in standard applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Status
STTH2006W	STMicroelectronics	600	20	1.75 @ 20 A	70	25 @ 600 V	DO-247-2	Obsolete
APT30D60BG	Microchip Technology	600	30	1.8 @ 30 A	85	250 @ 600 V	TO-247-2	Active
APT40DQ60BG	Microchip Technology	600	40	2.4 @ 40 A	25	25 @ 600 V	TO-247-2	Active
APT60D60BG	Microchip Technology	600	60	1.8 @ 60 A	130	250 @ 600 V	TO-247-2	Active
DSEI30-06A	IXYS	600	37	1.6 @ 37 A	50	100 @ 600 V	TO-247-2	Active
DSEI60-06A	IXYS	600	60	1.8 @ 70 A	50	200 @ 600 V	TO-247-2	Active
DSEI120-06A	IXYS	600	77	1.3 @ 70 A	50	3000 @ 600 V	TO-247-2	Active
DSEP30-06A	IXYS	600	30	1.6 @ 30 A	35	250 @ 600 V	TO-247-2	Active
DSEP30-06B	IXYS	600	30	2.51 @ 30 A	30	250 @ 600 V	ISOPLUS247™	Active
DSEP60-06A	IXYS	600	60	2.04 @ 60 A	35	650 @ 600 V	TO-247-2	Active
FFH50US60S	onsemi	600	50	1.54 @ 50 A	124	100 @ 600 V	TO-247-2	Obsolete

Engineering Selection Recommendations

Active Status Priority: All substitute parts listed with Active product status are recommended for new designs and ongoing procurement. These include APT30D60BG, APT40DQ60BG, APT60D60BG, DSEI30-06A, DSEI60-06A, DSEI120-06A, DSEP30-06A, DSEP30-06B, and DSEP60-06A. Active parts ensure long-term availability and manufacturer support.

Compliance Alignment: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original STTH2006W certification requirements. This ensures regulatory compatibility across all listed alternatives.

Current Rating Selection: For direct functional replacement with minimal design modification, select substitute parts with current ratings closest to 20 A. DSEP30-06A and APT30D60BG (both 30 A) provide the smallest margin above the original specification while maintaining active product status.

Thermal Performance Consideration: Operating temperature ranges vary among substitutes. Microchip Technology parts (APT series) support -55°C to 175°C, matching extended industrial temperature requirements. IXYS DSEI series supports -40°C to 150°C. STMicroelectronics original specification reaches 175°C maximum junction temperature.

Package Standardization: TO-247-2 package variants (APT series, DSEI series, DSEP60-06A) represent the most common substitute format. DSEP30-06B offers ISOPLUS247™ isolation for applications requiring galvanic isolation between diode terminals and mounting surface.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original STTH2006W?

A: Yes. Substitute parts with current ratings of 30 A, 37 A, 40 A, 50 A, 60 A, or 77 A are electrically compatible with the STTH2006W in applications requiring 20 A. Higher current ratings provide additional capacity margin without affecting circuit function. The 600 V voltage class and fast recovery characteristics remain constant across all substitutes.

Q: Are TO-247-2 and DO-247-2 packages mechanically interchangeable?

A: Yes. Both packages are through-hole configurations with identical lead spacing and mounting footprints. Substitute parts in TO-247-2 package (APT series, DSEI series, DSEP60-06A) mount directly into PCB holes designed for the original DO-247-2 package without modification.

Q: What is the difference between DSEI and DSEP series from IXYS?

A: DSEI series represents standard fast recovery diodes. DSEP series represents HiPerFRED™ technology, offering faster reverse recovery times (30–35 ns versus 50 ns) and lower forward voltage characteristics. Both series maintain 600 V rating and through-hole mounting. DSEP parts are preferred for applications requiring improved switching efficiency.

Q: Can I substitute the STTH2006W with FFH50US60S?

A: FFH50US60S is electrically compatible (600 V, 50 A, fast recovery, TO-247-2 package). However, FFH50US60S is classified as obsolete, making it unsuitable for new designs or long-term procurement. Active alternatives such as DSEP60-06A or APT60D60BG are recommended instead.

Q: What does reverse recovery time (trr) affect in circuit performance?

A: Reverse recovery time determines switching speed and efficiency. Lower trr values (25–35 ns) reduce switching losses and enable higher frequency operation. The STTH2006W operates at 70 ns trr. Substitutes with lower trr (APT40DQ60BG at 25 ns, DSEP30-06A at 35 ns) improve efficiency; those with higher trr (APT60D60BG at 130 ns) remain compatible but with slightly higher switching losses.

Q: Is DSEP30-06B (ISOPLUS247™) compatible with standard TO-247-2 footprints?

A: DSEP30-06B uses ISOPLUS247™ package, which differs from standard TO-247-2. While lead spacing is similar, the isolated mounting surface requires verification against PCB design. Standard TO-247-2 substitutes (DSEP30-06A, APT30D60BG) are recommended for direct footprint compatibility without design modification.

Q: What is the significance of forward voltage (Vf) variation among substitutes?

A: Forward voltage affects power dissipation and thermal performance. Lower Vf (DSEI120-06A at 1.3 V @ 70 A) reduces heat generation. Higher Vf (DSEP30-06B at 2.51 V @ 30 A) increases dissipation. For the STTH2006W at 1.75 V @ 20 A, substitutes with similar Vf (DSEP30-06A at 1.6 V, DSEI30-06A at 1.6 V) maintain equivalent thermal behavior.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original STTH2006W for applications subject to environmental restrictions.

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