STTH506B Equivalent & Substitute Parts

Part Overview

The STTH506B is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 5 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer comparable performance within acceptable parameter variations for the application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.85 V @ 5 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction (Max)	175	°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the STTH506B is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Current - Average Rectified (Io): 5 A minimum (higher ratings acceptable)
Voltage - Forward (Vf) (Max) @ If: Variations within application tolerance
Reverse Recovery Time (trr): Variations within application tolerance
Current - Reverse Leakage @ Vr: Variations within application tolerance
Operating Temperature - Junction: 175°C maximum required

Substitute parts are grouped into two categories: direct equivalents (identical 5 A rating) and higher-current alternatives (6 A rating) that maintain all mandatory parameters while offering enhanced current capacity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status
STTH506B	STMicroelectronics	600	5	1.85 @ 5A	50	5 @ 600V	175	Obsolete
VS-5EWH06FN-M3	Vishay General Semiconductor - Diodes Division	600	5	1.85 @ 5A	25	5 @ 600V	175	Active
BYV25D-600,118	WeEn Semiconductors	600	5	1.3 @ 5A	60	50 @ 600V	150	Active
DSEP6-06BS-TRL	IXYS	600	6	2.66 @ 6A	15	50 @ 600V	175	Active
MURHD560W1T4G	onsemi	600	5	2.7 @ 5A	30	10 @ 600V	175	Active
VS-6EWH06FN-M3	Vishay General Semiconductor - Diodes Division	600	6	2.1 @ 6A	27	50 @ 600V	175	Active
VS-6EWX06FNHM3	Vishay General Semiconductor - Diodes Division	600	6	3.1 @ 6A	19	20 @ 600V	175	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

VS-5EWH06FN-M3 (Vishay General Semiconductor - Diodes Division) is the primary direct equivalent, maintaining identical 5 A current rating and 600 V voltage specification. This part is active in production status and ROHS3 compliant. The reverse recovery time of 25 ns is superior to the original 50 ns specification, providing improved switching performance. Operating temperature range extends to −65°C, offering broader thermal operating capability.

Higher-Current Alternatives (For Enhanced Margin Applications):

DSEP6-06BS-TRL (IXYS), VS-6EWH06FN-M3 (Vishay), and VS-6EWX06FNHM3 (Vishay) provide 6 A current ratings while maintaining 600 V voltage specification and identical DPAK packaging. These parts accommodate applications requiring increased current capacity. All three are active in production status and ROHS3 compliant. VS-6EWX06FNHM3 includes automotive-grade qualification (AEC-Q101) for applications requiring automotive reliability standards.

Alternative with Lower Forward Voltage:

BYV25D-600,118 (WeEn Semiconductors) offers reduced forward voltage (1.3 V @ 5A) compared to the original specification (1.85 V @ 5A), resulting in lower power dissipation. This part is active in production status and RoHS compliant. Operating temperature maximum is 150°C, which is 25°C lower than the original specification and may require thermal design verification for high-temperature applications.

General-Purpose Alternative:

MURHD560W1T4G (onsemi) maintains 5 A current rating and 600 V voltage specification with active production status and ROHS3 compliance. Operating temperature range extends to −65°C. This part is available in high inventory quantity (10,300 pcs).

Frequently Asked Questions (FAQ)

Q: Can VS-5EWH06FN-M3 be used as a direct replacement for STTH506B?

A: Yes. VS-5EWH06FN-M3 maintains identical electrical specifications (600 V, 5 A) and identical DPAK package configuration. Both parts are surface mount devices with matching pinout and footprint. The substitute part is active in production status, addressing the obsolescence of the original STTH506B.

Q: What is the difference between 5 A and 6 A rated alternatives?

A: The 6 A alternatives (DSEP6-06BS-TRL, VS-6EWH06FN-M3, VS-6EWX06FNHM3) provide higher average rectified current capacity while maintaining identical 600 V voltage rating and DPAK packaging. These parts are suitable for applications where current margin is required. Forward voltage specifications vary among 6 A alternatives and must be evaluated for thermal design impact.

Q: Are all substitute parts ROHS3 compliant?

A: Six of the seven substitute parts are ROHS3 compliant (VS-5EWH06FN-M3, DSEP6-06BS-TRL, MURHD560W1T4G, VS-6EWH06FN-M3, VS-6EWX06FNHM3). BYV25D-600,118 is RoHS compliant but not specifically ROHS3 certified. Compliance requirements should be verified against application specifications.

Q: What is the significance of reverse recovery time (trr) variations?

A: Reverse recovery time affects switching speed and electromagnetic interference characteristics. The original STTH506B specifies 50 ns. Substitute parts range from 15 ns to 60 ns. Lower trr values (15–30 ns) indicate faster switching performance, while higher values (60 ns) represent slower recovery. Selection depends on circuit switching frequency and EMI requirements.

Q: Can BYV25D-600,118 be used in high-temperature applications?

A: BYV25D-600,118 has a maximum junction temperature of 150°C, which is 25°C lower than the original STTH506B specification (175°C). Applications requiring operation near 175°C should use alternative parts with higher temperature ratings: VS-5EWH06FN-M3, DSEP6-06BS-TRL, MURHD560W1T4G, VS-6EWH06FN-M3, or VS-6EWX06FNHM3.

Q: Is VS-6EWX06FNHM3 suitable for automotive applications?

A: Yes. VS-6EWX06FNHM3 carries automotive-grade qualification (AEC-Q101) and is rated for 6 A at 600 V in DPAK packaging. This part is appropriate for automotive circuit applications requiring qualified component status.

Q: What packaging formats are available for substitute parts?

A: All substitute parts use identical TO-252-3 DPAK (2 Leads + Tab) surface mount packaging, ensuring footprint compatibility. Packaging formats vary by supplier: VS-5EWH06FN-M3, VS-6EWH06FN-M3, and VS-6EWX06FNHM3 are supplied in Tube format; MURHD560W1T4G is supplied in Cut Tape (CT) & Digi-Reel®; DSEP6-06BS-TRL is supplied in Tape & Reel (TR); BYV25D-600,118 is supplied in Cut Tape (CT) & Digi-Reel®.

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