1SMB120AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB120AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage protection applications with a reverse standoff voltage of 120V and peak pulse current rating of 3.1A. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB120AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	120V
Voltage - Breakdown (Min)	133V
Voltage - Clamping (Max) @ Ipp	193V
Current - Peak Pulse (10/1000µs)	3.1A
Power - Peak Pulse	600W
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 1SMB120AT3 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 120V
Voltage - Clamping (Max) @ Ipp: 193V ±5% tolerance acceptable
Current - Peak Pulse (10/1000µs): 3.1A ±10% tolerance acceptable
Package / Case: DO-214AA (SMB) surface mount
Unidirectional configuration (single channel)
Power - Peak Pulse: 600W minimum

Direct Equivalents maintain all electrical parameters within specification limits and are pin-compatible replacements.

Similar Parts meet the core voltage and current requirements but may have minor variations in clamping voltage or peak pulse current that remain functionally acceptable for the application.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Package	Product Status	RoHS Status
1SMB120AT3	onsemi	120V	193V	3.1A	DO-214AA, SMB	Obsolete	RoHS non-compliant
SMBJ120A	MDD	120V	193V	3.1A	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ120A-13-F	Diodes Incorporated	120V	193V	3.1A	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ120A-TP	Micro Commercial Co	120V	193V	3.1A	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ120AE3/TR13	Microchip Technology	120V	193V	3.1A	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ120E3/TR13	Microchip Technology	120V	214V	2.8A	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ130CA	Meritek	130V	209V	2.87A	DO-214AA, SMB	Active	ROHS3 Compliant
TV06B121JB-G	Comchip Technology	120V	193V	3.11A	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Equivalents (Highest Compatibility):

SMBJ120A (MDD), SMBJ120A-13-F (Diodes Incorporated), SMBJ120A-TP (Micro Commercial Co), and SMBJ120AE3/TR13 (Microchip Technology) are direct electrical equivalents with identical voltage and current specifications. All are active products with ROHS3 compliance, making them suitable for new designs and production transitions from the obsolete 1SMB120AT3.

Secondary Alternatives (Minor Parameter Variation):

SMBJ120E3/TR13 (Microchip Technology) has a higher clamping voltage of 214V and slightly lower peak pulse current of 2.8A. This part is acceptable where the application can tolerate the increased clamping voltage and reduced current capacity.

SMBJ130CA (Meritek) has a higher reverse standoff voltage of 130V and clamping voltage of 209V with peak pulse current of 2.87A. This part is suitable only for applications where the higher voltage rating does not create circuit compatibility issues.

TV06B121JB-G (Comchip Technology) matches the 1SMB120AT3 specifications with 120V standoff, 193V clamping, and 3.11A peak pulse current. This part is an active product with ROHS3 compliance.

All substitute parts maintain the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can SMBJ120A directly replace 1SMB120AT3 without circuit modification?

A: Yes. SMBJ120A is a direct electrical equivalent with identical reverse standoff voltage (120V), clamping voltage (193V), and peak pulse current (3.1A). The DO-214AA package is mechanically compatible. No circuit changes are required.

Q: What is the difference between SMBJ120AE3/TR13 and SMBJ120E3/TR13?

A: SMBJ120AE3/TR13 maintains the original 193V clamping voltage and 3.1A peak pulse current. SMBJ120E3/TR13 has a higher clamping voltage of 214V and lower peak pulse current of 2.8A. Select SMBJ120AE3/TR13 for direct replacement.

Q: Is SMBJ130CA a suitable substitute?

A: SMBJ130CA has a higher reverse standoff voltage (130V) and clamping voltage (209V). It is functionally different from the 1SMB120AT3 and should only be used if the application circuit can accommodate the higher voltage rating.

Q: Why is RoHS compliance important for this substitution?

A: The original 1SMB120AT3 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for manufacturing and distribution.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts listed are available in DO-214AA (SMB) surface mount package, ensuring compatibility with existing PCB layouts and assembly processes.

Q: What is the operating temperature range consideration?

A: The 1SMB120AT3 operates from -65°C to 150°C. Most substitutes operate within -55°C to 150°C or -65°C to 150°C ranges. Verify the specific operating temperature requirement for your application before final selection.

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