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onsemi 1SMB110AT3
- Part No.:
- 1SMB110AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB110AT3.pdf
- Description:
- TVS DIODE 110VWM 177VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,483
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Product details
Overview
1SMB110AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 110 V working peak reverse voltage (VRWM), 135 V maximum clamping voltage (VC) at 3.4 A peak pulse current (IPP), and sub-1 ns response time - deployed in industrial power supplies, automotive ECUs, and communication interface lines.
For engineers reviewing the 1SMB110AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, VC margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The 1SMB110AT3 operates as a Zener-based avalanche diode, triggered when reverse voltage exceeds its 122–135 V breakdown range (VBR min/max). Its low zener impedance and fast junction response enable effective clamping of ESD and lightning-induced transients per IEC 61000-4-2/4-5.
It is rated for 600 W non-repetitive peak power (10/1000 µs waveform), with thermal derating above 75°C junction temperature and 260°C soldering tolerance. The device exhibits 5.0 µA max reverse leakage at VRWM and 3.5 V max forward voltage at 30 A IF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 110 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's DC or peak AC rail. |
| VBR @ IT = 1.0 A | 122–135 V - Breakdown voltage range defining turn-on threshold; ensures reliable triggering without premature conduction. |
| VC @ IPP = 3.4 A | 177 V - Maximum clamped voltage during 10/1000 µs surge; determines protected IC's voltage stress ceiling. |
| PPK | 600 W - Peak transient power handling capability; defines survivability against high-energy surges like ISO 7637-2 Pulse 5a. |
| IR @ VRWM | 5.0 µA - Reverse leakage current at rated working voltage; negligible loading on high-impedance signal or bias lines. |
| Response Time | <1.0 ns - Junction-level avalanche delay; enables suppression before downstream ICs experience overstress. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates reliability in telecom and industrial safety-critical interfaces. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to ground or low-impedance return plane; forms low-inductance path for surge current dissipation. |
| Cathode | Protected line connection point | Connected to the line being safeguarded (e.g., CAN_H, RS-485 A/B, DC input); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W Peak Power Rating | Handles severe transients such as ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems without failure. |
| UL 497B Certification | Validated for use in isolated loop protection circuits - required for industrial fieldbus and telecom interface designs. |
| ESD Robustness | Class 3 (>16 kV HBM) - provides intrinsic board-level ESD immunity without additional discrete protection. |
| Low Clamping Ratio | VC/VRWM ≈ 1.61 - tight voltage margin between operating and clamping levels improves system-level overvoltage headroom. |
| Pb-Free (G suffix) | RoHS-compliant Surmetic SMB package - compatible with lead-free reflow profiles and long-term supply chain sustainability requirements. |
Applications
| Automotive Power Input Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: 12 V battery-fed ECU input subjected to load dump transients up to 120 V for 400 ms. IC Role / Device Role: Primary overvoltage clamp placed directly across input filter capacitor. Use Value: Limits voltage seen by upstream DC-DC controller to ≤177 V, preventing latch-up or die damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: RS-485 transceiver bus lines exposed to induced surges in factory automation cabling. IC Role / Device Role: Unidirectional TVS on A/B differential pair referenced to local ground. Use Value: Clamps common-mode surges to <177 V while preserving signal integrity via low capacitance (175 pF) and fast response. |
| Medical Equipment Power Supply | Telecom Isolated Loop Interface |
Use Scenario: Secondary-side 48 V DC output of medical-grade AC/DC adapter subject to conducted surges. IC Role / Device Role: Output rail protector downstream of isolation barrier and post-regulation stage. Use Value: Ensures secondary-side voltage remains within IEC 60601-1 creepage/clearance limits during surge events, supporting safety certification. |
Use Scenario: 4–20 mA current loop transmitter connected to field sensors in hazardous environments. IC Role / Device Role: UL 497B-recognized protector on loop power feed line. Use Value: Meets Underwriters Laboratories requirements for isolated loop protection, enabling compliance with NEC Class 1 Div 2 installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ110A | Same VRWM (110 V) and VC (177 V), but lower PPK (600 W vs. 600 W identical), higher IR (10 µA vs. 5 µA), no UL 497B listing. | Lacks UL recognition; unsuitable for certified isolated loop or telecom safety-critical designs. | Select only where UL compliance is not required and leakage sensitivity is low. |
| 1.5SMC110A | Higher PPK (1500 W), larger SMC package (7.1 mm × 6.2 mm), same VRWM/VC, but 2× footprint area and 3× thermal resistance. | Requires PCB redesign; better for high-repetition surges but incompatible with space-constrained SMB layouts. | Choose only when surge repetition rate exceeds 1SMB110AT3's thermal limits and board space allows SMC placement. |
Compared with SMBJ110A and 1.5SMC110A, the 1SMB110AT3 uniquely balances compact SMB footprint, UL 497B certification, and 5 µA low-leakage performance - making it optimal for certified industrial interfaces and automotive modules where size, safety, and precision clamping are jointly critical.
Availability
1SMB110AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial RS-485 networks, and medical power supply outputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMB110AT3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMB110AT3 belongs to the SMB series of unidirectional Zener TVS diodes, engineered specifically for robust, cost-effective overvoltage protection in space-constrained, high-reliability applications including automotive electronics and industrial communications.
FAQ
What is the clamping voltage of the 1SMB110AT3 under standard surge conditions?
The 1SMB110AT3 has a maximum clamping voltage (VC) of 177 V when subjected to its rated peak pulse current (IPP) of 3.4 A using the 10/1000 µs waveform. This value is measured per Figure 2 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Does the 1SMB110AT3 meet UL safety standards for isolated loop protection?
Yes, the 1SMB110AT3 carries UL 497B recognition under file QVGQ2 for protectors used in isolated loop circuits. This certification covers testing for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming its suitability for safety-critical telecom and industrial fieldbus applications where regulatory compliance is mandatory.
What is the reverse leakage current specification for the 1SMB110AT3 at its working voltage?
The 1SMB110AT3 specifies a maximum reverse leakage current (IR) of 5.0 µA at its working peak reverse voltage (VRWM) of 110 V and ambient temperature of 25°C. This ultra-low leakage minimizes parasitic loading on high-impedance nodes such as sensor bias lines or precision reference circuits without compromising protection performance.
Can the 1SMB110AT3 be used in automotive load dump protection?
Yes, the 1SMB110AT3 is qualified for automotive load dump protection per ISO 7637-2 Pulse 5a due to its 600 W peak power rating, 177 V clamping voltage, and ability to withstand repetitive surges when properly heatsinked. Its SMB package supports automated SMT assembly in engine control units and body electronics modules where space and reliability are constrained.
What is the package type and mounting configuration of the 1SMB110AT3?
The 1SMB110AT3 uses the SMB (Case 403A) surface-mount package - a void-free, thermosetting plastic housing with modified L-bend leads and cathode polarity band. It is designed for reflow soldering at 260°C for 10 seconds and mounts in any orientation on FR-4 PCBs using ON Semiconductor's recommended footprint for optimal thermal and mechanical reliability.
1SMB110AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 3.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 175pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB110AT3 FAQ
1.How can I place an order for 1SMB110AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB110AT3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1SMB110AT3 reliable?
The price and inventory of 1SMB110AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB110AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB110AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB110AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB110AT3?
1SMB110AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB110AT3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1SMB110AT3?
For technical support, including 1SMB110AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB110AT3 requirements.
6.How does Aetrix verify that 1SMB110AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB110AT3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1SMB110AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB110AT3?
All 1SMB110AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB110AT3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1SMB110AT3 part is unused and in its original packaging.
Return procedure for 1SMB110AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB110AT3 Tags
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