MSR860 Equivalent & Substitute Parts

Part Overview

The MSR860 is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220-2 package. Manufactured by onsemi under the SWITCHMODE™ series, this component is classified as Obsolete. Due to its obsolete status and limited availability, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating package variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 8 A	V
Reverse Recovery Time (trr)	120	ns
Current - Reverse Leakage @ Vr	10	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Standard	-

Substitute Part Grouping Explanation

Substitute parts for the MSR860 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalent (Identical Current Rating): Parts maintaining the 8 A average rectified current specification with 600 V reverse voltage rating qualify as direct equivalents. These parts preserve the original design intent without circuit re-evaluation.

Functional Equivalent (Reduced Current Rating): Parts with lower current ratings (3 A, 5 A, 6 A) are classified as functional equivalents suitable for applications where the full 8 A capacity is not required. These parts maintain the 600 V voltage specification and fast recovery speed classification.

Substitution Criteria: The following parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Current - Average Rectified (Io): Must equal or exceed application requirement
Speed Classification: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole required
Package / Case: TO-220-2 compatible
Operating Temperature Range: Must accommodate application thermal requirements

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Status	RoHS
MSR860	onsemi	600	8	1.7 @ 8A	120	10 @ 600V	TO-220-2	Obsolete	Non-compliant
MSR860G	onsemi	600	8	1.7 @ 8A	120	10 @ 600V	TO-220-2	Obsolete	ROHS3 Compliant
STTH8L06D	STMicroelectronics	600	8	1.3 @ 8A	105	8 @ 600V	TO-220-2	Active	ROHS3 Compliant
VS-HFA08TB60-M3	Vishay General Semiconductor - Diodes Division	600	8	2.1 @ 16A	55	5 @ 600V	TO-220-2	Active	ROHS3 Compliant
LXA06T600	Power Integrations	600	6	2.94 @ 6A	23	250 @ 600V	TO-220-2	Active	RoHS Compliant
QH03TZ600	Power Integrations	600	3	3.0 @ 3A	9.8	250 @ 600V	TO-220-2	Active	RoHS Compliant
LQA03TC600	Power Integrations	600	3	3.1 @ 3A	13	20 @ 600V	TO-220-2	Active	RoHS Compliant
STTH506D	STMicroelectronics	600	5	1.85 @ 5A	50	5 @ 600V	TO-220-2	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Selection:

For applications requiring the full 8 A capacity with 600 V reverse voltage, the STTH8L06D (STMicroelectronics) is the primary direct equivalent. This part maintains identical voltage and current specifications while offering improved reverse recovery time (105 ns versus 120 ns) and lower reverse leakage current (8 µA versus 10 µA). The STTH8L06D carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

The VS-HFA08TB60-M3 (Vishay General Semiconductor - Diodes Division) provides an alternative direct equivalent with superior reverse recovery time (55 ns) and lower reverse leakage current (5 µA). This part is rated for higher forward current measurement (16 A) and maintains Active product status with ROHS3 compliance.

The MSR860G (onsemi) represents a direct electrical equivalent with identical specifications to the original MSR860 but with ROHS3 compliance. However, this part retains Obsolete product status, limiting its suitability for new designs despite improved regulatory compliance.

Functional Equivalent Selection:

For applications where 8 A capacity is not required, the STTH506D (STMicroelectronics) at 5 A rating provides a functional equivalent with superior reverse recovery time (50 ns) and lower reverse leakage current (5 µA). This part carries ROHS3 compliance and Obsolete status.

The LXA06T600 (Power Integrations) at 6 A rating offers Active product status with RoHS compliance. This part provides adequate capacity for applications requiring less than 8 A while maintaining 600 V voltage specification.

The QH03TZ600 and LQA03TC600 (both Power Integrations) at 3 A rating are suitable only for applications with significantly reduced current requirements. Both parts carry Active product status and RoHS compliance.

Compliance and Availability Considerations:

Parts with Active product status (STTH8L06D, VS-HFA08TB60-M3, LXA06T600, QH03TZ600, LQA03TC600) are preferred for new designs due to assured long-term availability. ROHS3 and RoHS compliance certifications align with current regulatory requirements across multiple jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can the MSR860 be directly replaced with the STTH8L06D?

A: Yes. The STTH8L06D maintains identical 600 V reverse voltage and 8 A average rectified current specifications. Both parts use the TO-220-2 package and fast recovery speed classification. The STTH8L06D offers improved performance characteristics (lower reverse recovery time and leakage current) and carries Active product status with ROHS3 compliance.

Q: What is the difference between TO-220-2 and TO-220AC package designations?

A: The TO-220-2 and TO-220AC designations refer to the same physical package form factor used for Through Hole mounting. Both accommodate identical PCB footprints and thermal management requirements. The designations reflect different manufacturer nomenclature conventions without affecting mechanical or electrical compatibility.

Q: Can a 6 A rated diode substitute for an 8 A application?

A: No. The LXA06T600 at 6 A rating cannot be used in applications requiring the full 8 A capacity. Substitution with reduced current ratings is valid only when the application current requirement does not exceed the substitute part's rating. Circuit re-evaluation is required to confirm that peak and average current demands remain within the substitute part's specifications.

Q: Why do some substitute parts show higher forward voltage drops?

A: Forward voltage characteristics vary across manufacturers and device technologies. The QH03TZ600 and LQA03TC600 show forward voltages of 3.0 V and 3.1 V respectively at their rated currents (3 A), compared to the MSR860 at 1.7 V @ 8 A. These differences reflect different semiconductor materials and junction designs. Forward voltage specifications are measured at the part's rated current, not at the original part's current rating.

Q: Are all substitute parts RoHS compliant?

A: No. The MSR860 is RoHS non-compliant. The MSR860G is ROHS3 compliant. The STTH8L06D, VS-HFA08TB60-M3, and STTH506D are ROHS3 compliant. The LXA06T600, QH03TZ600, and LQA03TC600 are RoHS compliant. Compliance status must be verified against specific regulatory requirements for the target application and market.

Q: What is reverse recovery time and why does it vary among substitutes?

A: Reverse recovery time (trr) is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. The MSR860 specifies 120 ns. Substitute parts range from 9.8 ns (QH03TZ600) to 120 ns (MSR860G). Faster recovery times reduce switching losses in high-frequency applications but do not affect DC rectification performance. Selection depends on circuit switching frequency requirements.

Q: Can the VS-HFA08TB60-M3 be used in place of the MSR860 despite different forward voltage specifications?

A: Yes. The VS-HFA08TB60-M3 maintains the required 600 V reverse voltage and 8 A average rectified current. The forward voltage specification (2.1 V @ 16 A) is measured at a different current level than the MSR860 (1.7 V @ 8 A). At the MSR860's rated current of 8 A, the VS-HFA08TB60-M3 will exhibit lower forward voltage than specified at 16 A. Circuit thermal analysis should confirm that the substitute part's power dissipation remains acceptable.

Q: Is the MSR860G suitable for new product designs?

A: The MSR860G carries Obsolete product status despite ROHS3 compliance. New product designs should utilize parts with Active product status to ensure long-term availability and supply chain stability. The STTH8L06D or VS-HFA08TB60-M3 are preferred alternatives for new designs.

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