SS310-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS310-HF is an active Schottky rectifier diode manufactured by Comchip Technology, rated for 100V DC reverse voltage and 3A average rectified current in a surface mount DO-214AC (SMA) package. This component is designed for fast recovery applications requiring low forward voltage drop and rapid switching characteristics. Equivalent and substitute parts are identified based on matching electrical ratings, package compatibility, and thermal specifications to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitute parts for the SS310-HF are identified based on the following critical electrical and mechanical parameters:

Voltage Rating: Reverse voltage (Vr) must equal 100V maximum to ensure equivalent blocking capability.

Current Rating: Average rectified current (Io) must equal 3A to match load handling capacity.

Forward Voltage Drop: Forward voltage (Vf) at rated current must not exceed 850mV @ 3A to maintain equivalent power dissipation and thermal performance.

Recovery Speed: Fast recovery characteristic with switching time ≤ 500ns at currents > 200mA is required for equivalent switching performance.

Package Compatibility: Surface mount DO-214AC (SMA) package ensures mechanical and thermal interface compatibility with existing PCB layouts.

Operating Temperature Range: Junction temperature range of -55°C to 125°C must be maintained for equivalent reliability across industrial and commercial applications.

Technology Type: Schottky diode technology is mandatory for equivalent low forward voltage and fast switching characteristics.

Parameter Comparison

Parameter	SS310-HF (Comchip)	SS310 (MDD)	Match Status
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	850 mV @ 3 A	Equivalent
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	300 µA @ 100 V	500 µA @ 100 V	Within tolerance
Capacitance @ Vr, F	400 pF @ 4V, 1MHz	300 pF @ 4V, 1MHz	Within tolerance
Package / Case	DO-214AC, SMA	DO-214AC, SMA	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature - Junction	-55°C to 125°C	-55°C to 125°C	Equivalent
Technology	Schottky	Schottky	Equivalent

Engineering Selection Recommendations

SS310 (MDD Manufacturer)

The MDD SS310 is a parametric equivalent to the Comchip SS310-HF. Both devices meet identical electrical specifications for voltage, current, and switching performance. The MDD variant demonstrates RoHS compliance and REACH unaffected status, confirming regulatory alignment with environmental standards. Reverse leakage current in the MDD part (500 µA @ 100V) is within acceptable tolerance relative to the Comchip specification (300 µA @ 100V), and junction capacitance variation (300 pF vs. 400 pF @ 4V, 1MHz) remains within typical application margins. Both parts maintain identical operating temperature ranges (-55°C to 125°C) and surface mount package compatibility. Selection between these parts depends on availability, supply chain requirements, and procurement lead times, as electrical performance is equivalent for standard rectification and fast recovery applications.

Frequently Asked Questions (FAQ)

Q: Can the MDD SS310 directly replace the Comchip SS310-HF in existing designs?

A: Yes. Both parts share identical voltage ratings (100V), current ratings (3A), forward voltage characteristics (850mV @ 3A), and fast recovery speed specifications (≤500ns). The DO-214AC (SMA) surface mount package is identical, enabling direct PCB substitution without layout modifications.

Q: What is the significance of the reverse leakage current difference between the two parts?

A: The Comchip SS310-HF specifies 300 µA @ 100V reverse leakage, while the MDD SS310 specifies 500 µA @ 100V. This difference is within normal manufacturing tolerance for Schottky diodes and does not affect circuit functionality in standard rectification applications. Applications requiring extremely low leakage current should verify specific design requirements.

Q: Are there package compatibility concerns when substituting between these parts?

A: No. Both the Comchip SS310-HF and MDD SS310 use the DO-214AC (SMA) surface mount package. Mechanical dimensions, lead spacing, and thermal interface characteristics are identical, ensuring direct PCB compatibility without rework.

Q: What compliance certifications apply to both substitute parts?

A: The Comchip SS310-HF is RoHS3 compliant with MSL 1 (Unlimited). The MDD SS310 is RoHS compliant and REACH unaffected. Both parts carry EAR99 export classification. Verify specific compliance requirements for your application and regional regulations.

Q: How do the capacitance specifications differ, and does this affect circuit performance?

A: The Comchip SS310-HF specifies 400 pF @ 4V, 1MHz, while the MDD SS310 specifies 300 pF @ 4V, 1MHz. This 100 pF variation is typical for Schottky diode manufacturing and does not significantly impact switching performance in standard rectification circuits. High-frequency applications should verify junction capacitance effects on specific circuit designs.

Q: What is the product status of both parts?

A: Both the Comchip SS310-HF and MDD SS310 are classified as Active products, indicating current manufacturing and availability through authorized distributors.

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