STTA506D Equivalent & Substitute Parts

Part Overview

The STTA506D 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 device is part of the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 50 ns. The STTA506D is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the through-hole TO-220-2 package format.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 5 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute diodes for the STTA506D are selected based on the following critical parameters:

Voltage Compatibility: All substitute parts must maintain a DC reverse voltage rating of 600 V to ensure safe operation in the same circuit topology.

Current Rating: Substitute parts are grouped by average rectified current capacity. Parts rated at 5 A or higher (5 A, 6 A, 8 A, 10 A) are electrically compatible with the original 5 A specification. Parts rated below 5 A (3 A) are not suitable for direct substitution.

Package Format: All substitutes use the TO-220-2 through-hole package or compatible variants (TO-220AC, TO-220ACFP), ensuring mechanical and thermal interface compatibility.

Speed Classification: All substitutes maintain fast recovery characteristics (≤ 500 ns) consistent with the original device.

Compliance Standards: Substitute parts must meet RoHS3 compliance or equivalent environmental standards to satisfy regulatory requirements.

Product Status: Active status substitutes are preferred over obsolete devices to ensure long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	Package
STTA506D	STMicroelectronics	600	5	1.75 @ 5 A	50	100 @ 600 V	150	Obsolete	TO-220AC
STTH5L06D	STMicroelectronics	600	5	1.3 @ 5 A	95	5 @ 600 V	175	Active	TO-220AC
BYC10-600PQ	WeEn Semiconductors	600	10	1.8 @ 10 A	19	—	150	Active	TO-220AC
LQA03TC600	Power Integrations	600	3	3.1 @ 3 A	13	20 @ 600 V	150	Active	TO-220AC
LXA06T600	Power Integrations	600	6	2.94 @ 6 A	23	250 @ 600 V	150	Active	TO-220AC
QH03TZ600	Power Integrations	600	3	3 @ 3 A	9.8	250 @ 600 V	150	Active	TO-220AC
RFVS8TG6SGC9	Rohm Semiconductor	600	8	3 @ 8 A	40	10 @ 600 V	150	Active	TO-220ACFP
SDUR560	SMC Diode Solutions	600	—	1.55 @ 5 A	50	5 @ 600 V	150	Active	TO-220AC

Engineering Selection Recommendations

Direct Electrical Equivalents (5 A Rating):

STTH5L06D (STMicroelectronics) is the primary substitute for STTA506D. Both devices share identical voltage and current ratings (600 V, 5 A) and are housed in compatible TO-220AC packages. STTH5L06D is active status, ensuring supply chain continuity. The forward voltage is lower (1.3 V vs. 1.75 V), resulting in reduced power dissipation. The reverse leakage current is significantly lower (5 µA vs. 100 µA), and the maximum junction temperature is higher (175°C vs. 150°C), providing improved thermal margin.

SDUR560 (SMC Diode Solutions) provides equivalent electrical performance at the 5 A level with forward voltage of 1.55 V and reverse recovery time matching the original specification at 50 ns. This device is active status and RoHS3 compliant.

Higher Current Capacity Substitutes:

LXA06T600 (Power Integrations) is rated for 6 A and maintains 600 V reverse voltage. This device is suitable for applications where the 5 A requirement can accommodate higher current capacity. The forward voltage is 2.94 V at 6 A, and reverse recovery time is 23 ns.

BYC10-600PQ (WeEn Semiconductors) is rated for 10 A at 600 V and offers the highest current capacity among available substitutes. This device is appropriate for designs requiring current margin or future uprating. The reverse recovery time is 19 ns, the fastest among all listed substitutes.

RFVS8TG6SGC9 (Rohm Semiconductor) is rated for 8 A at 600 V in a TO-220ACFP package variant. This device provides intermediate current capacity with a reverse recovery time of 40 ns.

Lower Current Capacity Substitutes (Not Recommended for Direct Replacement):

LQA03TC600 and QH03TZ600 (Power Integrations) are both rated for 3 A, below the original 5 A specification. These devices are not suitable for direct substitution in applications requiring the full 5 A capacity.

Compliance and Regulatory Status:

All substitute parts listed are RoHS3 compliant or RoHS compliant, meeting current environmental regulations. STTH5L06D, BYC10-600PQ, LXA06T600, QH03TZ600, and RFVS8TG6SGC9 are designated as active products, ensuring long-term availability and manufacturing support. SDUR560 is active status with REACH affected designation, requiring verification for specific end-use applications subject to REACH restrictions.

Frequently Asked Questions (FAQ)

Q: Can STTH5L06D directly replace STTA506D in existing designs?

A: Yes. STTH5L06D is electrically and mechanically compatible with STTA506D. Both devices are rated for 600 V and 5 A, use the TO-220AC package, and are classified as fast recovery diodes. STTH5L06D is active status, addressing the obsolescence of STTA506D. The lower forward voltage and reverse leakage current of STTH5L06D provide performance improvements without requiring circuit modifications.

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

A: Both are through-hole TO-220-2 package variants with identical pin configurations and thermal interfaces. TO-220ACFP includes a flat lead design. RFVS8TG6SGC9 uses the TO-220ACFP variant and is mechanically compatible with standard TO-220AC footprints.

Q: Can I use a 3 A rated diode (LQA03TC600 or QH03TZ600) as a substitute?

A: No. These devices are rated for 3 A average rectified current, which is below the original 5 A specification. Using an undersized device creates thermal stress and reduces component reliability. Substitutes must maintain current ratings equal to or greater than 5 A.

Q: What are the advantages of using higher current rated substitutes like BYC10-600PQ?

A: Higher current rated devices provide design margin and thermal headroom. BYC10-600PQ (10 A) operates at lower junction temperature stress when carrying 5 A, extending component life. The faster reverse recovery time (19 ns vs. 50 ns) reduces switching losses in high-frequency applications. However, higher current devices may have different forward voltage characteristics that affect circuit performance.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes are RoHS3 compliant or RoHS compliant. SDUR560 carries a REACH affected designation, requiring verification for applications subject to REACH chemical restrictions. Consult material safety documentation for specific end-use requirements.

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

A: Forward voltage variations affect power dissipation and thermal performance. STTH5L06D (1.3 V @ 5 A) dissipates less power than STTA506D (1.75 V @ 5 A). Higher current rated devices like BYC10-600PQ (1.8 V @ 10 A) and RFVS8TG6SGC9 (3 V @ 8 A) may have different forward voltage characteristics at the 5 A operating point. Circuit designs with tight voltage regulation or thermal constraints require verification of forward voltage performance at actual operating current.

Q: How does reverse recovery time affect circuit performance?

A: Reverse recovery time (trr) determines switching speed and affects electromagnetic interference (EMI) characteristics. STTA506D has a trr of 50 ns. Substitutes with faster recovery times (STTH5L06D at 95 ns is slower; BYC10-600PQ at 19 ns is faster) alter switching transients. Faster recovery reduces EMI but may increase voltage spikes. Circuit designs sensitive to switching transients require evaluation of trr specifications.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) affects standby power consumption and thermal performance at rated reverse voltage. STTA506D has 100 µA @ 600 V. STTH5L06D (5 µA) and SDUR560 (5 µA) have significantly lower leakage, reducing standby power dissipation. Higher leakage devices like LXA06T600 and QH03TZ600 (250 µA) increase thermal load in standby conditions. Applications with extended standby periods benefit from lower leakage substitutes.

Q: Is inventory availability a factor in substitute selection?

A: Yes. Inventory levels indicate supply chain availability. STTH5L06D (1902 pcs), LQA03TC600 (16921 pcs), and LXA06T600 (8111 pcs) have substantial stock. BYC10-600PQ (1018 pcs), RFVS8TG6SGC9 (2019 pcs), and SDUR560 (1894 pcs) have moderate availability. Active status products ensure continued manufacturing support beyond current inventory.

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