1SMB110AT3 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The 1SMB110AT3 is a unidirectional transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 110V reverse standoff voltage with a 177V maximum clamping voltage and 3.4A peak pulse current capability in a DO-214AA (SMB) package. The part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

1SMB110AT3

onsemiIn Stock: 11601SMB110AT3 Datasheet

Current PartRFQ

SMBJ110A

MDDIn Stock: 47498SMBJ110A Datasheet

DirectRFQ

SMBJ110A

MDDIn Stock: 47498SMBJ110A Datasheet

DirectRFQ

SMBJ110A

MDDIn Stock: 47498SMBJ110A Datasheet

DirectRFQ

SMBJ100CA

Good-Ark SemiconductorIn Stock: 20340SMBJ100CA Datasheet

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SMBJ100CA-TP

Micro Commercial CoIn Stock: 2998SMBJ100CA-TP Datasheet

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SMBJ100CA-TR

STMicroelectronicsIn Stock: 7887SMBJ100CA-TR Datasheet

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SMBJ110A-13-F

Diodes IncorporatedIn Stock: 4753SMBJ110A-13-F Datasheet

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SMBJ110AE3/TR13

Microchip TechnologyIn Stock: 896SMBJ110AE3/TR13 Datasheet

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SMBJ110E3/TR13

Microchip TechnologyIn Stock: 1185SMBJ110E3/TR13 Datasheet

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TV06B110JB-G

Comchip TechnologyIn Stock: 1254TV06B110JB-G Datasheet

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TV06B111JB-G

Comchip TechnologyIn Stock: 1176TV06B111JB-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMB110AT3 is determined by the following critical parameters:

Primary Substitution Criteria (Direct Equivalents):

• Voltage - Reverse Standoff: 110V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 177V (±tolerance)
• Current - Peak Pulse: 3.4A (±tolerance)
• Power - Peak Pulse: 600W
• Unidirectional configuration (1 channel)
• Package: DO-214AA (SMB)
• Mounting: Surface Mount

Secondary Substitution Criteria (Functional Alternatives):

• Voltage - Reverse Standoff: 100V (lower voltage rating, acceptable for 110V applications with margin reduction)
• Voltage - Clamping: 162V (lower clamping voltage, acceptable for general-purpose protection)
• Current - Peak Pulse: 3.7–3.8A (higher current capability, backward compatible)
• Bidirectional configuration (provides protection in both directions, suitable for AC or bidirectional circuits)

Parts are grouped as Direct Equivalents when all primary criteria match within standard tolerances. Parts are grouped as Functional Alternatives when secondary criteria allow substitution in applications where the lower voltage rating or bidirectional protection does not compromise circuit protection requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMBJ110A (MDD), SMBJ110A-13-F (Diodes Incorporated), and SMBJ110AE3/TR13 (Microchip Technology) are direct functional equivalents to the 1SMB110AT3. All three maintain identical electrical specifications: 110V reverse standoff, 177V clamping voltage, and 3.4A peak pulse current. All three are active products with ROHS3 compliance, addressing the obsolescence of the original part. SMBJ110AE3/TR13 matches the original operating temperature range (-65°C to 150°C), providing the closest thermal compatibility. SMBJ110A-13-F offers the widest availability (4700 pcs in stock) and is suitable for applications where the slightly reduced lower temperature limit (-55°C vs. -65°C) is acceptable.

Functional Alternatives (Secondary Substitutes):

SMBJ110E3/TR13 (Microchip Technology) maintains the 110V reverse standoff voltage but increases the clamping voltage to 196V and reduces peak pulse current to 3.0A. This part is suitable for applications where higher clamping voltage provides additional protection margin but does not require the full 3.4A current capability.

SMBJ100CA (Good-Ark Semiconductor), SMBJ100CA-TP (Micro Commercial Co), and SMBJ100CA-TR (STMicroelectronics) operate at 100V reverse standoff with 162V clamping voltage and 3.7–3.8A peak pulse current. These parts are bidirectional (suitable for AC or bidirectional protection circuits) and are acceptable substitutes only in applications where the 10V lower standoff voltage does not compromise protection requirements. All three are active with ROHS3 compliance.

Not Recommended:

TV06B110JB-G (Comchip Technology) operates at 11V reverse standoff with 18.2V clamping voltage and 32.97A peak pulse current. This part is designed for low-voltage protection circuits and is not suitable for 110V applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ110A directly replace 1SMB110AT3 without circuit modification?

A: Yes. SMBJ110A is a direct electrical equivalent with identical voltage and current ratings. Both are unidirectional TVS diodes in DO-214AA (SMB) packages. The primary difference is product status (SMBJ110A is active; 1SMB110AT3 is obsolete) and RoHS compliance (SMBJ110A is ROHS3 compliant). No circuit modification is required.

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

A: Unidirectional TVS diodes (1 channel) protect against overvoltage in one direction only and are used in DC circuits with defined polarity. Bidirectional TVS diodes (1 channel, bidirectional) protect against overvoltage in both directions and are used in AC circuits or circuits where polarity may reverse. The 1SMB110AT3 is unidirectional; SMBJ100CA series parts are bidirectional. Substituting a bidirectional part for a unidirectional part is acceptable if the application permits; the reverse substitution is not recommended.

Q: Can I use SMBJ100CA (100V standoff) instead of SMBJ110A (110V standoff)?

A: SMBJ100CA can be used only if the application circuit tolerates a 10V lower standoff voltage. The 100V standoff means the diode will begin conducting at a lower threshold, reducing the protection margin. This substitution is acceptable in applications with adequate design margin but is not recommended as a primary choice. SMBJ100CA also features bidirectional protection, which may or may not be required depending on circuit topology.

Q: What does "RoHS3 Compliant" mean, and why does it matter?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental regulations restricting hazardous materials such as lead, cadmium, and mercury. The original 1SMB110AT3 is RoHS non-compliant. All recommended active substitutes (SMBJ110A, SMBJ110A-13-F, SMBJ110AE3/TR13) are ROHS3 compliant, making them suitable for applications requiring regulatory compliance.

Q: Does operating temperature range affect substitution?

A: Operating temperature range affects substitution only if the application requires the full -65°C to 150°C range. SMBJ110AE3/TR13 matches the original -65°C lower limit. SMBJ110A and SMBJ110A-13-F are rated to -50°C and -55°C respectively. If the application operates below -50°C, SMBJ110AE3/TR13 is the preferred choice. For most commercial and industrial applications operating above -50°C, all three direct equivalents are acceptable.

Q: What is the significance of the "13-F" suffix in SMBJ110A-13-F?

A: The "13-F" suffix indicates the specific packaging and tape configuration (Cut Tape & Digi-Reel format). This is a packaging designation only and does not affect electrical performance. SMBJ110A-13-F is electrically identical to SMBJ110A and can be used interchangeably in the same circuit.

Q: Why is TV06B110JB-G listed but not recommended?

A: TV06B110JB-G is listed in the original substitute list but operates at 11V reverse standoff, not 110V. This is a low-voltage TVS diode designed for 5V or 12V logic protection circuits. It is not suitable for 110V applications and should not be used as a substitute for the 1SMB110AT3.