ISL9R460S3ST Equivalent & Substitute Parts

Part Overview

The ISL9R460S3ST is a general-purpose rectifier diode manufactured by onsemi, rated for 600 V DC reverse voltage and 4 A average rectified current in a surface mount D2PAK (TO-263) package. This device is classified as obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	2.4 V @ 4 A	V
Reverse Recovery Time (trr)	22	ns
Current - Reverse Leakage @ Vr	100	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	—
Operating Temperature - Junction	-55°C to 175°C	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ISL9R460S3ST is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), or TO-263AB
Mounting Type: Must be Surface Mount
Speed Classification: Must support Fast Recovery ≤ 500ns, > 200mA (Io)

Functional Compatibility Criteria:

Current - Average Rectified (Io): Substitute parts rated at 4 A or higher are functionally compatible
Voltage - Forward (Vf) (Max) @ If: Lower forward voltage drop indicates improved efficiency
Reverse Recovery Time (trr): Lower values indicate faster switching characteristics
Current - Reverse Leakage @ Vr: Lower leakage current indicates superior reverse blocking performance
Operating Temperature - Junction: Must support the required thermal range

Substitute parts are grouped based on current rating. Parts with current ratings equal to or exceeding the original 4 A specification, combined with identical voltage and package requirements, are direct functional replacements. Parts with higher current ratings provide design margin and enhanced thermal performance while maintaining full backward compatibility.

Parameter Comparison

Parameter	ISL9R460S3ST	VS-HFA04TB60S-M3	STTH806G-TR	STTH8R06G-TR	STTH12R06G-TR	VS-ETL1506S-M3	VS-ETL1506STRLHM3
Manufacturer	onsemi	Vishay	STMicroelectronics	STMicroelectronics	STMicroelectronics	Vishay	Vishay
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	4 A	4 A	8 A	8 A	12 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	2.4 V @ 4 A	2.2 V @ 8 A	1.85 V @ 8 A	2.9 V @ 8 A	2.9 V @ 12 A	1.07 V @ 15 A	1.07 V @ 15 A
Reverse Recovery Time (trr)	22 ns	42 ns	55 ns	45 ns	45 ns	210 ns	210 ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	3 µA @ 600 V	8 µA @ 600 V	30 µA @ 600 V	45 µA @ 600 V	15 µA @ 600 V	15 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	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	175°C	150°C	175°C	175°C	175°C	175°C	175°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - Matched Current Rating:

The VS-HFA04TB60S-M3 (Vishay HEXFRED® series) is the closest functional equivalent to the ISL9R460S3ST. Both devices share identical voltage (600 V) and current (4 A) ratings with the same D2PAK package. The VS-HFA04TB60S-M3 is in active production status, ensuring long-term supply availability. This device exhibits superior reverse leakage performance (3 µA versus 100 µA) and comparable reverse recovery time (42 ns versus 22 ns). The operating temperature range of -55°C to 150°C covers the lower end of the original specification but remains suitable for most industrial applications. ROHS3 compliance provides regulatory alignment for modern manufacturing environments.

Secondary Substitutes - Higher Current Ratings:

The STTH806G-TR and STTH8R06G-TR (STMicroelectronics, 8 A rating) provide enhanced current capacity with identical voltage and package specifications. Both devices are in active production. The STTH806G-TR offers the lowest forward voltage drop (1.85 V @ 8 A) among all substitutes, resulting in improved thermal efficiency. The STTH8R06G-TR provides a middle-ground option with moderate forward voltage (2.9 V @ 8 A) and reverse leakage (30 µA).

The STTH12R06G-TR (STMicroelectronics, 12 A rating) and VS-ETL1506S-M3 / VS-ETL1506STRLHM3 (Vishay FRED Pt® series, 15 A rating) offer the highest current capacity. These devices provide substantial design margin for thermal management and current handling. The Vishay FRED Pt® devices demonstrate exceptional forward voltage performance (1.07 V @ 15 A), indicating superior efficiency characteristics. The VS-ETL1506STRLHM3 variant includes AEC-Q101 automotive qualification, suitable for automotive and harsh environment applications.

Compliance and Supply Considerations:

All substitute parts listed are in active production status with ROHS3 compliance, ensuring regulatory alignment and supply chain continuity. The ISL9R460S3ST, classified as obsolete, has no path to future production. Selection of any active substitute ensures access to current manufacturing processes and quality standards.

Frequently Asked Questions (FAQ)

Q: Can the VS-HFA04TB60S-M3 directly replace the ISL9R460S3ST in existing designs?

A: Yes. Both devices share identical voltage (600 V), current (4 A), and package (D2PAK) specifications. The VS-HFA04TB60S-M3 is pin-compatible and functionally equivalent. The primary difference is superior reverse leakage performance (3 µA versus 100 µA) in the substitute, which represents an improvement. Operating temperature range differs slightly (-55°C to 150°C versus -55°C to 175°C), but this does not affect most applications.

Q: What is the advantage of selecting a higher-current substitute such as the STTH12R06G-TR?

A: Higher-current substitutes (8 A, 12 A, or 15 A ratings) provide design margin for thermal management and current handling. These devices maintain identical voltage and package specifications while offering enhanced performance headroom. In applications approaching the 4 A limit, a higher-rated substitute reduces junction temperature rise and extends component lifetime. All higher-current substitutes are fully backward compatible with the original 4 A design.

Q: Are there differences in switching speed between the ISL9R460S3ST and its substitutes?

A: Yes. The ISL9R460S3ST exhibits the fastest reverse recovery time (22 ns) among all listed devices. Substitutes range from 42 ns (VS-HFA04TB60S-M3) to 210 ns (Vishay FRED Pt® series). For applications sensitive to switching speed, such as high-frequency power conversion, the VS-HFA04TB60S-M3 or STMicroelectronics STTH806G-TR are preferred. For standard rectification applications, the longer recovery times of higher-current substitutes do not impact performance.

Q: What is the significance of forward voltage drop differences?

A: Forward voltage drop directly affects power dissipation and thermal performance. Lower forward voltage (measured at rated current) results in reduced heat generation. The Vishay FRED Pt® series (1.07 V @ 15 A) demonstrates the lowest forward voltage, followed by the STTH806G-TR (1.85 V @ 8 A). In high-current or continuous-duty applications, selecting a substitute with lower forward voltage improves efficiency and reduces cooling requirements.

Q: Is the D2PAK package identical across all substitute parts?

A: Yes. All substitute parts use the TO-263-3 D2PAK package with 2 leads plus tab configuration. This ensures mechanical and electrical compatibility with existing PCB layouts. No redesign or rework is required for package accommodation.

Q: Why is the VS-ETL1506STRLHM3 qualified for automotive applications?

A: The VS-ETL1506STRLHM3 carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and quality standards. This qualification is relevant only for applications requiring automotive-grade components. For non-automotive applications, the standard industrial variants (VS-ETL1506S-M3 or other substitutes) are appropriate.

Q: What is the impact of reverse leakage current on circuit performance?

A: Reverse leakage current affects blocking performance and power dissipation in reverse bias conditions. The ISL9R460S3ST exhibits 100 µA leakage at 600 V, which is higher than all substitutes. The VS-HFA04TB60S-M3 (3 µA) provides superior blocking performance. In applications with high reverse voltage stress or low-power standby requirements, lower leakage current reduces parasitic power loss and improves circuit efficiency.

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

A: Yes, provided the application does not impose strict constraints on switching speed or forward voltage drop. All listed substitutes maintain the same voltage, package, and mounting specifications. However, designs sensitive to thermal performance should standardize on a single substitute to ensure consistent heat dissipation characteristics across production units.

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