1SMB100AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB100AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 100V reverse standoff voltage with 162V maximum clamping voltage and 3.7A peak pulse current capability in the DO-214AA (SMB) package format. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Active alternatives from multiple manufacturers provide identical or compatible electrical performance with improved availability and RoHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	100	V
Voltage - Breakdown (Min)	111	V
Voltage - Clamping (Max) @ Ipp	162	V
Current - Peak Pulse (10/1000µs)	3.7	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	TJ
Unidirectional Channels	1	—
Type	Zener	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB100AT3 is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 100V
Voltage - Breakdown (Min): 111V
Voltage - Clamping (Max) @ Ipp: 162V
Current - Peak Pulse (10/1000µs): 3.7A (±0.1A tolerance acceptable)
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional configuration (1 channel)

Direct Equivalents meet all primary criteria with identical electrical specifications and unidirectional topology. These parts are fully interchangeable in circuit applications requiring the 1SMB100AT3 performance envelope.

Similar Parts share the same voltage and package specifications but may have minor variations in peak pulse current (within 0.1A), clamping voltage tolerance, or operating temperature range. These are suitable for applications where the specified performance window accommodates the variation.

Non-Equivalent Parts (SMBJ90CA, SMBJ100E3/TR13) are excluded due to voltage or current parameter deviations that fall outside the 1SMB100AT3 specification window and are not suitable for direct substitution.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	VBR (Min) V	VC (Max) @ Ipp V	Ipp (10/1000µs) A	Package	Channels	Product Status	RoHS Status
1SMB100AT3	onsemi	100	111	162	3.7	DO-214AA, SMB	1 (Unidirectional)	Obsolete	Non-compliant
SMBJ100A	MDD	100	111	162	3.7	DO-214AA, SMB	1 (Unidirectional)	Active	ROHS3 Compliant
SMBJ100A-13-F	Diodes Incorporated	100	111	162	3.7	DO-214AA, SMB	1 (Unidirectional)	Active	ROHS3 Compliant
SMBJ100A-TP	Micro Commercial Co	100	111	162	3.7	DO-214AA, SMB	1 (Unidirectional)	Active	ROHS3 Compliant
SMBJ100AE3/TR13	Microchip Technology	100	111	162	3.7	DO-214AA, SMB	1 (Unidirectional)	Active	ROHS3 Compliant
SMBJ100CA-TR	STMicroelectronics	100	111	162	3.8	DO-214AA, SMB	1 (Bidirectional)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Substitutes (Identical Specifications):

SMBJ100A (MDD), SMBJ100A-13-F (Diodes Incorporated), SMBJ100A-TP (Micro Commercial Co), and SMBJ100AE3/TR13 (Microchip Technology) are fully equivalent to the 1SMB100AT3. All four parts maintain identical voltage ratings (100V standoff, 111V breakdown, 162V clamping), peak pulse current (3.7A), and unidirectional topology. All substitute parts are in active production status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original component.

Alternative with Minor Specification Variance:

SMBJ100CA-TR (STMicroelectronics) provides equivalent voltage performance with a marginally higher peak pulse current specification (3.8A versus 3.7A). This part features bidirectional topology rather than unidirectional configuration. Selection of this part is appropriate only when circuit design accommodates bidirectional suppression and the 0.1A current increase does not create thermal or performance concerns.

Inventory and Packaging Considerations:

MDD SMBJ100A offers the highest inventory availability (38,400 pcs) in standard SMB/DO-214AA packaging. Diodes Incorporated SMBJ100A-13-F is available in Cut Tape and Digi-Reel formats (5,473 pcs). Micro Commercial Co SMBJ100A-TP is supplied in Tape & Reel format (17,100 pcs) with extended operating temperature range (-55°C to 175°C). Microchip Technology SMBJ100AE3/TR13 is available in Tape & Reel format (770 pcs) with standard temperature range (-65°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can SMBJ100A directly replace 1SMB100AT3 in existing designs?

A: Yes. SMBJ100A from MDD matches all critical electrical parameters: 100V reverse standoff, 111V breakdown minimum, 162V clamping maximum, and 3.7A peak pulse current. Both use identical DO-214AA (SMB) surface-mount packaging. The primary difference is product status (active versus obsolete) and RoHS3 compliance.

Q: What is the difference between unidirectional and bidirectional TVS diodes?

A: Unidirectional TVS diodes (1SMB100AT3, SMBJ100A series) suppress transients in one direction only and are used for single-polarity protection. Bidirectional TVS diodes (SMBJ100CA-TR) suppress transients in both directions and are used for AC or bipolar signal protection. The 1SMB100AT3 requires unidirectional substitutes unless circuit topology permits bidirectional suppression.

Q: Are there temperature range differences between substitutes?

A: Yes. The 1SMB100AT3 operates from -65°C to 150°C. SMBJ100A-TP extends the upper limit to 175°C. SMBJ100A-13-F operates from -55°C to 150°C. SMBJ100AE3/TR13 and SMBJ100CA-TR match the original -65°C to 150°C range. Select based on application thermal requirements.

Q: What packaging formats are available for these substitutes?

A: All substitutes use DO-214AA (SMB) surface-mount packages. Packaging options vary by manufacturer: MDD SMBJ100A is available in standard reel format; Diodes Incorporated SMBJ100A-13-F offers Cut Tape and Digi-Reel options; Micro Commercial Co SMBJ100A-TP and Microchip Technology SMBJ100AE3/TR13 are supplied in Tape & Reel format.

Q: Why is SMBJ100CA-TR listed as a similar part rather than a direct equivalent?

A: SMBJ100CA-TR has bidirectional topology (1 bidirectional channel) versus the unidirectional configuration of 1SMB100AT3 (1 unidirectional channel). Additionally, peak pulse current is specified at 3.8A rather than 3.7A. These differences make it suitable only for applications where bidirectional suppression is acceptable and the 0.1A current increase does not create design constraints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (SMBJ100A, SMBJ100A-13-F, SMBJ100A-TP, SMBJ100AE3/TR13, SMBJ100CA-TR) are ROHS3 compliant. The original 1SMB100AT3 is RoHS non-compliant, making substitution necessary for applications requiring regulatory compliance.

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