SMBJ18A-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ18A-E3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 18V reverse standoff category and is designed for general-purpose transient voltage protection applications. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the DO-214AA (SMB) package family.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ18A-E3/5B
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	20V
Voltage - Clamping (Max) @ Ipp	29.2V
Current - Peak Pulse (10/1000µs)	20.5A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMBJ18A-E3/5B are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 18V
Voltage - Breakdown (Min): 20V or 20.3V
Voltage - Clamping (Max) @ Ipp: 28.8V to 29.2V
Current - Peak Pulse (10/1000µs): 20.5A to 20.8A
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant

Parts meeting these criteria are considered direct electrical equivalents. Variations in clamping voltage within the 28.8V to 29.2V range and peak pulse current within 20.5A to 20.8A are acceptable for general-purpose transient protection applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	RoHS Status
SMBJ18A-E3/5B	Vishay General Semiconductor - Diodes Division	18V	20V	29.2V	20.5A	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ18D-M3/I	Vishay General Semiconductor - Diodes Division	18V	20.3V	28.8V	20.8A	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
1SMB18A TR13 PBFREE	Central Semiconductor Corp	18V	20V	29.2V	20.5A	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ18A	EVVO Semi	18V	20V	29.2V	20.6A	600W	-65°C ~ 150°C	DO-214AC, SMA	ROHS3 Compliant
SMBJ18A-13-F	Diodes Incorporated	18V	20V	29.2V	20.5A	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ18A-TP	Micro Commercial Co	18V	20V	29.2V	20.5A	600W	-55°C ~ 175°C	DO-214AA, SMB	ROHS3 Compliant
SACB18	Littelfuse Inc.	18V	20V	28.8V	15A	500W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T18A	STMicroelectronics	15.3V	17.1V	32.5V	123A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement):

SMBJ18A-E3/5B can be directly replaced with SMBJ18D-M3/I, 1SMB18A TR13 PBFREE, SMBJ18A-13-F, or SMBJ18A-TP. These parts maintain identical or near-identical electrical specifications within acceptable tolerances for the 18V standoff category. All are ROHS3 compliant with MSL 1 rating and Active product status.

Alternative with Extended Temperature Range:

SMBJ18A-TP extends the upper operating temperature to 175°C compared to the standard 150°C, providing additional thermal margin for high-temperature applications while maintaining all other electrical parameters.

Lower Current Alternative:

SACB18 (Littelfuse Inc.) provides equivalent voltage protection but with reduced peak pulse current (15A versus 20.5A) and lower peak pulse power (500W versus 600W). This part is suitable for applications with lower transient current requirements.

Non-Equivalent Alternative:

SM6T18A (STMicroelectronics) differs significantly in electrical characteristics: lower reverse standoff voltage (15.3V), higher clamping voltage (32.5V), and substantially higher peak pulse current (123A at 8/20µs pulse). This part is not recommended as a direct substitute for the SMBJ18A-E3/5B.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18A-E3/5B be replaced with SMBJ18D-M3/I?

A: Yes. Both parts share the same 18V reverse standoff voltage, 20V+ breakdown voltage, and 600W peak pulse power rating. The clamping voltage difference (29.2V versus 28.8V) and peak pulse current difference (20.5A versus 20.8A) are within acceptable tolerances for general-purpose transient protection.

Q: What is the difference between DO-214AA and DO-214AC packages?

A: DO-214AA and DO-214AC are both SMB-class surface mount packages with identical footprints and pinouts. The SMBJ18A from EVVO Semi uses DO-214AC (SMA designation) but is mechanically and electrically compatible with DO-214AA applications.

Q: Is SACB18 a suitable replacement?

A: SACB18 maintains the 18V standoff and 28.8V clamping voltage but provides only 15A peak pulse current versus 20.5A in the original part. Use SACB18 only if your application requires less than 15A transient current protection.

Q: Why is SM6T18A not recommended as a substitute?

A: SM6T18A has a lower reverse standoff voltage (15.3V versus 18V) and higher clamping voltage (32.5V versus 29.2V), making it unsuitable for circuits designed for 18V protection. The significantly higher peak pulse current (123A) indicates a different application class.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ18A-E3/5B specifications.

Q: Can I use SMBJ18A-TP in place of SMBJ18A-E3/5B?

A: Yes. SMBJ18A-TP is a direct electrical equivalent with identical voltage and current ratings. The extended operating temperature range (-55°C to 175°C versus -55°C to 150°C) provides additional thermal capability without compromising compatibility.

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