SS310B-HF Equivalent & Substitute Parts

Part Overview

The SS310B-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Schottky diodes in this voltage and current class are used in power supply circuits, DC-DC converters, and reverse polarity protection applications where fast recovery characteristics and low forward voltage drop are required. Alternative equivalent parts become necessary when the primary manufacturer part is unavailable, when specific packaging formats are required, or when automotive-grade qualification is mandated for end-application requirements.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS310B-HF is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 850 mV @ 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C
Technology: Schottky
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Secondary Variation Parameters (Allowed Differences):

Manufacturer identity
Packaging format (Tape & Reel vs. Cut Tape vs. Digi-Reel)
Current - Reverse Leakage @ Vr (within acceptable range for Schottky diodes)
Capacitance @ Vr, F (when specified)
Automotive qualification and AEC-Q101 certification (optional enhancement)

All substitute parts listed maintain identical electrical performance specifications and package dimensions, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Package	Packaging Format	Product Status	Automotive Grade
SS310B-HF	Comchip Technology	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	300 @ 100 V	DO-214AA, SMB	Tape & Reel (TR)	Active	—
SK310B	Taiwan Semiconductor Corporation	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	100 @ 100 V	DO-214AA, SMB	Cut Tape (CT) & Digi-Reel®	Active	—
SK310B R5G	Taiwan Semiconductor Corporation	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	100 @ 100 V	DO-214AA, SMB	Cut Tape (CT)	Discontinued at DiGi Electronics	—
SK310B-LTP	Micro Commercial Co	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	500 @ 100 V	DO-214AA, SMB	Tape & Reel (TR)	Active	—
SK310BH	Taiwan Semiconductor Corporation	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	100 @ 100 V	DO-214AA, SMB	Tape & Reel (TR)	Active	AEC-Q101
SK310BHE3-LTP	Micro Commercial Co	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	100 @ 100 V	DO-214AA, SMB	Tape & Reel (TR)	Active	AEC-Q101
SS310B	MDD	100	3	850 @ 3 A	Fast Recovery ≤ 500ns	300 @ 100 V	DO-214AA, SMB	Tape & Reel (TR)	Active	—

Engineering Selection Recommendations

For Standard Industrial Applications (Non-Automotive):

SK310B and SS310B are direct functional equivalents to SS310B-HF. Both maintain identical electrical specifications and are available in active product status. SK310B is supplied in Cut Tape and Digi-Reel formats with higher inventory availability (26,100 units). SS310B is supplied in Tape & Reel format with the largest inventory stock (300,300 units) and is recommended for high-volume procurement.

For Automotive Applications Requiring AEC-Q101 Qualification:

SK310BH (Taiwan Semiconductor Corporation) and SK310BHE3-LTP (Micro Commercial Co) are automotive-grade equivalents with AEC-Q101 qualification. Both maintain identical electrical performance and operating temperature range. SK310BHE3-LTP is supplied in Tape & Reel format with 6,742 units in stock. SK310BH is supplied in Tape & Reel format with 7,260 units in stock.

For Tape & Reel Packaging Requirement:

SS310B-HF, SK310B-LTP, SK310BH, SK310BHE3-LTP, and SS310B are all available in Tape & Reel format. SK310B-LTP (Micro Commercial Co) offers the highest inventory level at 43,522 units and is suitable for high-volume surface mount assembly operations.

For Cut Tape Packaging Requirement:

SK310B (Taiwan Semiconductor Corporation) is available in Cut Tape and Digi-Reel formats with 26,100 units in stock, suitable for lower-volume or prototype applications.

Discontinued Part Consideration:

SK310B R5G is listed as discontinued at DiGi Electronics and should not be selected for new designs or long-term production commitments.

Frequently Asked Questions (FAQ)

Q: Can SK310B be used as a direct replacement for SS310B-HF?

A: Yes. SK310B maintains identical electrical specifications: 100 V reverse voltage, 3 A average rectified current, 850 mV forward voltage drop at 3 A, and fast recovery characteristics. Both are housed in DO-214AA (SMB) surface mount packages with identical pin configurations and footprints. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and manufacturer.

Q: What is the difference between SK310B and SK310BH?

A: SK310BH includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Both parts share identical electrical specifications and DO-214AA package. SK310BH is supplied in Tape & Reel format. Selection between these parts depends on whether automotive qualification is required for the end application.

Q: Is SK310B-LTP suitable for high-volume production?

A: Yes. SK310B-LTP is manufactured by Micro Commercial Co and is available in Tape & Reel format with 43,522 units in stock. It maintains identical electrical specifications to SS310B-HF and is suitable for automated surface mount assembly. The higher inventory level supports high-volume production requirements.

Q: What is the significance of the reverse leakage current variation among substitute parts?

A: Reverse leakage current (Ir) varies among manufacturers: SS310B-HF and SS310B specify 300 µA @ 100 V, while SK310B, SK310BH, and SK310BHE3-LTP specify 100 µA @ 100 V, and SK310B-LTP specifies 500 µA @ 100 V. These variations remain within acceptable Schottky diode specifications and do not affect functional compatibility in standard rectification and protection circuits. Selection based on leakage current is application-specific and depends on circuit requirements for standby power consumption or reverse bias conditions.

Q: Can automotive-grade parts (SK310BH, SK310BHE3-LTP) be used in non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification exceed the requirements of standard industrial applications and provide enhanced reliability. These parts are fully compatible with non-automotive circuits and may be selected when higher reliability margins are desired.

Q: What is the difference between SK310B and SK310B R5G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications. SK310B R5G is listed as discontinued at DiGi Electronics and should not be selected for new designs. SK310B remains in active product status and is the recommended alternative.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SK310B, SK310B R5G, SK310B-LTP, SK310BH, SK310BHE3-LTP, and SS310B) are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the compliance status of SS310B-HF.

Q: What packaging formats are available for SS310B-HF substitutes?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel. SS310B-HF is supplied in Tape & Reel format. For direct packaging compatibility, select substitute parts also supplied in Tape & Reel format: SK310B-LTP, SK310BH, SK310BHE3-LTP, and SS310B.

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