STTH506D Equivalent & Substitute Parts

Part Overview

The STTH506D is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 5 A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications requiring 600 V, 5 A rectification capability.

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 @ 5	V @ A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Supplier Device Package	TO-220AC	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH506D is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Parameters (Must Match or Exceed):

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 5 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-2 or compatible TO-220 variant
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Parameters (Acceptable Variation):

Voltage - Forward (Vf): Acceptable within design margin
Reverse Recovery Time (trr): Lower values acceptable
Current - Reverse Leakage: Lower values acceptable
Operating Temperature - Junction: Equal or higher acceptable
RoHS/REACH Compliance: Must maintain or exceed original status

Substitute parts are grouped into two categories:

Direct Equivalent (Recommended Manufacturer Substitute): STTH5L06D from STMicroelectronics matches all critical parameters with improved forward voltage performance and active product status.

Functional Equivalents (Similar Specifications): Parts from IXYS, Vishay, WeEn Semiconductors, Power Integrations, and Infineon that meet or exceed the 600 V, 5 A rating in TO-220AC packaging. These parts satisfy the electrical requirements but may differ in secondary parameters such as forward voltage, reverse recovery time, or reverse leakage current.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	trr [ns]	Ir @ Vr [µA @ V]	Package	Product Status
STTH506D	STMicroelectronics	600	5	1.85 @ 5	50	5 @ 600	TO-220AC	Obsolete
STTH5L06D	STMicroelectronics	600	5	1.3 @ 5	95	5 @ 600	TO-220AC	Active
BYV25X-600,127	WeEn Semiconductors	600	5	1.3 @ 5	60	50 @ 600	TO-220FP	Active
DHG5I600PA	IXYS	600	5	2.2 @ 5	35	10 @ 600	TO-220AC	Active
DHG10I600PA	IXYS	600	10	2.35 @ 10	35	15 @ 600	TO-220AC	Active
DHG20I600PA	IXYS	600	20	2.32 @ 20	35	30 @ 600	TO-220AC	Active
FES16JT-E3/45	Vishay General Semiconductor	600	16	1.5 @ 16	50	10 @ 600	TO-220AC	Active
QH03TZ600	Power Integrations	600	3	3 @ 3	9.8	250 @ 600	TO-220AC	Active
LXA06T600	Power Integrations	600	6	2.94 @ 6	23	250 @ 600	TO-220AC	Active
LQA03TC600	Power Integrations	600	3	3.1 @ 3	13	20 @ 600	TO-220AC	Active
IDP15E60XKSA1	Infineon Technologies	600	29.2	2 @ 15	87	50 @ 600	TO-220-2	Obsolete

Engineering Selection Recommendations

Primary Recommendation: STTH5L06D

The STTH5L06D from STMicroelectronics is the manufacturer-recommended direct equivalent. It maintains identical voltage and current ratings (600 V, 5 A) and is packaged in the same TO-220AC configuration. The part carries active product status, ensuring long-term availability and supply chain stability. Forward voltage is reduced to 1.3 V at 5 A, providing improved efficiency compared to the original STTH506D. RoHS3 compliance and REACH unaffected status match the original specification. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations by Application Requirement:

For applications requiring higher current capacity within the same voltage class, DHG10I600PA (10 A) or DHG20I600PA (20 A) from IXYS provide active product status and TO-220AC packaging. These parts are suitable for designs where current headroom is beneficial.

For applications prioritizing minimal reverse recovery time, LXA06T600 from Power Integrations (6 A, 23 ns trr) or QH03TZ600 (3 A, 9.8 ns trr) offer superior switching characteristics. Both are active products in TO-220AC packaging.

For applications requiring higher operating temperature capability, FES16JT-E3/45 from Vishay supports -65°C to 150°C junction temperature range with 16 A capacity and active product status.

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all alternatives, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can STTH5L06D directly replace STTH506D in existing designs?

A: Yes. STTH5L06D is the manufacturer-recommended equivalent with identical voltage (600 V) and current (5 A) ratings, matching package (TO-220AC), and mounting type (Through Hole). The reduced forward voltage (1.3 V vs. 1.85 V) improves efficiency without requiring circuit modification.

Q: What is the difference between TO-220AC and TO-220FP packaging?

A: TO-220AC features a standard isolated tab, while TO-220FP (Full Pack) provides an isolated tab with full insulation. Both are TO-220-2 case variants. BYV25X-600,127 uses TO-220FP packaging and is electrically compatible but requires verification of mechanical fit in existing PCB layouts.

Q: Can I use DHG10I600PA or DHG20I600PA as substitutes for the 5 A rated STTH506D?

A: Yes, these parts are functionally compatible. DHG10I600PA (10 A) and DHG20I600PA (20 A) exceed the 5 A requirement and maintain 600 V voltage rating in TO-220AC packaging. They are suitable for designs where higher current capacity provides design margin. Forward voltage is higher (2.35 V and 2.32 V respectively), which may affect thermal performance in power-sensitive applications.

Q: Why is STTH506D listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. STTH5L06D is the active replacement, ensuring continued availability and manufacturing support.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitutes maintain RoHS3 compliance or equivalent environmental certification. Verify specific compliance requirements for your application and regional regulations.

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

A: Reverse recovery time affects switching speed and electromagnetic interference characteristics. Lower trr values (e.g., LXA06T600 at 23 ns) reduce switching losses and EMI. Higher trr values (e.g., STTH5L06D at 95 ns) are acceptable in applications with lower switching frequencies. Circuit performance should be validated if trr differs significantly from the original design specification.

Q: Can I substitute a 3 A rated diode (QH03TZ600 or LQA03TC600) for the 5 A STTH506D?

A: No. These parts are rated for 3 A average rectified current, which is below the 5 A requirement. Using an undersized component risks thermal stress and premature failure. Select substitutes rated for 5 A or higher.

Q: What is the operating temperature range difference between STTH506D and its substitutes?

A: STTH506D supports 175°C maximum junction temperature. Most substitutes support 150°C maximum (STTH5L06D, BYV25X-600,127, LXA06T600, LQA03TC600, DHG5I600PA, DHG10I600PA, DHG20I600PA, FES16JT-E3/45). IDP15E60XKSA1 supports 175°C. Verify thermal design margins if operating near maximum junction temperature limits.

Q: Is moisture sensitivity a concern for these diodes?

A: All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling and storage practices are sufficient; no special dry-pack or baking procedures are required.

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