SMB5817 Equivalent & Substitute Parts

Part Overview

The SMB5817 is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and fast switching applications. The SMB5817's obsolete status requires identification of active alternatives that maintain electrical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SMB5817 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: DO-214AA or compatible SMB variant
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 20 V

Current Rating Consideration: The SMB5817 is rated for 1 A average rectified current. Substitute parts with equal or higher current ratings (1 A, 2 A, or 3 A) are electrically compatible, as they operate within the same voltage class and maintain the same reverse leakage characteristics. Higher current-rated devices provide design margin without compromising circuit function.

Compliance Status: The SMB5817 is RoHS non-compliant. Active substitutes must be evaluated based on their RoHS compliance status and product availability. ROHS3-compliant alternatives are preferred for new designs and long-term supply assurance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Tj (°C)	Product Status	RoHS Status
SMB5817	Micro Commercial Co	20	1	450 @ 1 A	DO-214AA (SMB)	-55 to 125	Obsolete	Non-compliant
SK12E3/TR13	Microsemi Corporation	20	1	450 @ 1 A	DO-214AA (SMBJ)	-65 to 175	Active	ROHS3 Compliant
B220-13-F	Diodes Incorporated	20	2	500 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
B220A-13-F	Diodes Incorporated	20	2	500 @ 2 A	DO-214AC (SMA)	-65 to 150	Active	ROHS3 Compliant
B220Q-13-F	Diodes Incorporated	20	2	500 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH2-20 BK PBFREE	Central Semiconductor Corp	20	2	500 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH2-20 TR13 PBFREE	Central Semiconductor Corp	20	2	500 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH2-20L BK PBFREE	Central Semiconductor Corp	20	2	400 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH2-20L TR13 PBFREE	Central Semiconductor Corp	20	2	400 @ 2 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH3-20M BK PBFREE	Central Semiconductor Corp	20	3	550 @ 3 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
CMSH3-20M TR13 PBFREE	Central Semiconductor Corp	20	3	550 @ 3 A	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Identical Current Rating):

The SK12E3/TR13 manufactured by Microsemi Corporation is the direct electrical equivalent to the SMB5817. Both devices are rated for 20 V reverse voltage and 1 A average rectified current with identical forward voltage characteristics (450 mV @ 1 A). The SK12E3/TR13 is active in production, ROHS3 compliant, and features an extended operating temperature range (-65°C to 175°C versus -55°C to 125°C), providing superior thermal performance. This part is the primary recommendation for direct replacement.

Higher Current Alternatives (2 A and 3 A Ratings):

For applications where design margin or future current headroom is required, the following active alternatives provide higher current capacity while maintaining 20 V reverse voltage compatibility:

B220-13-F (Diodes Incorporated): 2 A rating, DO-214AA (SMB) package, ROHS3 compliant
B220Q-13-F (Diodes Incorporated): 2 A rating, automotive-qualified (AEC-Q101), DO-214AA (SMB) package, ROHS3 compliant
CMSH2-20 TR13 PBFREE (Central Semiconductor Corp): 2 A rating, tape and reel packaging, ROHS3 compliant
CMSH2-20L TR13 PBFREE (Central Semiconductor Corp): 2 A rating with improved forward voltage (400 mV @ 2 A), tape and reel packaging, ROHS3 compliant
CMSH3-20M TR13 PBFREE (Central Semiconductor Corp): 3 A rating, tape and reel packaging, ROHS3 compliant

Package Consideration:

The B220A-13-F is rated for 2 A but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). This part is not recommended for direct PCB replacement without layout modification, as the SMA package has different footprint dimensions than the SMB package.

Compliance and Supply:

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance for new designs. The SMB5817's obsolete status and RoHS non-compliance make transition to an active alternative necessary for production continuity.

Frequently Asked Questions (FAQ)

Q: Can the SK12E3/TR13 be used as a direct replacement for the SMB5817?

A: Yes. The SK12E3/TR13 is electrically and mechanically compatible with the SMB5817. Both devices share identical voltage (20 V), current (1 A), and forward voltage (450 mV @ 1 A) specifications. The SK12E3/TR13 is active in production and ROHS3 compliant, making it the recommended direct replacement.

Q: What is the difference between 1 A, 2 A, and 3 A rated alternatives?

A: The current rating indicates the maximum average rectified current the diode can conduct continuously. A 1 A diode (SK12E3/TR13) matches the SMB5817 specification exactly. A 2 A or 3 A rated diode can conduct higher currents and provides design margin but operates at the same 20 V reverse voltage. Selection depends on circuit current requirements and thermal design considerations.

Q: Are all substitute parts in the same package?

A: Most substitutes use the DO-214AA (SMB) package, which is mechanically and electrically compatible with the SMB5817. The exception is the B220A-13-F, which uses the DO-214AC (SMA) package. The SMA package has different PCB footprint dimensions and requires layout modification for installation.

Q: What does "ROHS3 Compliant" mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. The SMB5817 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: Can I use a 2 A or 3 A rated diode in a circuit designed for the 1 A SMB5817?

A: Yes. A higher current-rated diode is electrically compatible in a circuit designed for lower current. The diode will operate within its safe operating region. However, the forward voltage may differ slightly at the same current level, which should be considered in precision analog circuits. For most applications, this difference is negligible.

Q: What is the difference between tape and reel (TR) and bulk (BK) packaging?

A: Tape and reel (TR) packaging is used for automated assembly and high-volume production. Bulk (BK) packaging is used for manual assembly or lower-volume applications. Both contain the same electronic component; the difference is in the physical packaging format. Selection depends on manufacturing process requirements.

Q: Why does the CMSH2-20L have a lower forward voltage (400 mV @ 2 A) than other 2 A alternatives?

A: Forward voltage variation is a normal characteristic of Schottky diodes from different manufacturers and process variations. The CMSH2-20L's lower forward voltage (400 mV @ 2 A) represents improved efficiency in power dissipation compared to alternatives rated at 500 mV @ 2 A. This can be advantageous in power supply applications where heat generation is a concern.

Q: Is the B220Q-13-F automotive-qualified alternative suitable for non-automotive applications?

A: Yes. The B220Q-13-F carries AEC-Q101 automotive qualification, which indicates it meets stringent reliability and quality standards. Automotive-qualified components are suitable for any application and provide additional assurance of quality and long-term reliability. This part is a valid alternative for both automotive and general industrial applications.

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