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onsemi 1SMB13AT3
- Part No.:
- 1SMB13AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB13AT3.pdf
- Description:
- TVS DIODE 13VWM 21.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,743
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Product details
Overview
1SMB13AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) diode in SMB package, with 13 V working peak reverse voltage (VRWM), 15.9 V maximum clamping voltage (VC) at 27.9 A peak pulse current (IPP), and <1.0 ns response time. It protects sensitive electronics in power supplies and industrial control systems against ESD and lightning-induced surges.
For engineers reviewing the 1SMB13AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, IPP capability under defined surge waveforms (10/1000 µs), UL 497B certification for isolated loop protection, and SMB package thermal performance under PCB layout constraints.
Technical Context
The 1SMB13AT3 operates as a voltage-clamping device in parallel with protected circuitry, entering avalanche breakdown when transient voltage exceeds its 14.4 V nominal breakdown voltage (VBR) at 1.0 mA test current. Its low zener impedance and fast <1.0 ns response ensure rapid energy diversion before downstream components experience overvoltage stress.
Designed for non-repetitive 10/1000 µs surge events up to 600 W, it features 5.0 µA max reverse leakage at VRWM, 21.5 V clamping voltage at 27.9 A IPP, and thermal derating from 0.55 W at 25°C ambient to zero at 150°C - requiring attention to PCB copper area and trace width for junction-to-ambient heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 13 V - must be ≥ continuous DC or peak AC operating voltage of protected line to avoid leakage or power loss |
| VBR (min/typ/max) | 13.3 / 14.4 / 15.15 V @ IT = 1.0 mA - defines precise avalanche onset threshold for design margining |
| VC @ IPP | 21.5 V @ 27.9 A - maximum voltage seen by protected IC during full-rated 10/1000 µs surge |
| PPK | 600 W @ 1 ms - peak surge energy handling capacity per single non-repetitive event |
| IR @ VRWM | 5.0 µA max - ensures negligible standby current draw in high-impedance signal or bias lines |
| Response Time | <1.0 ns - enables clamping before most logic and analog ICs experience latch-up or damage |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 system-level ESD immunity requirements |
| UL Recognition | UL 497B QVGQ2 - certified for use in isolated loop circuits including telecom and process control interfaces |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; leads are modified L-bend for enhanced solder joint reliability on FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; must minimize inductance via short, wide traces |
| Cathode | Clamped output node | Connected to protected line (e.g., VBUS, RS-485 bus, sensor supply); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W Peak Power Rating | Handles IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) surges without degradation |
| Low Clamping Ratio (VC/VBR) | 21.5 V / 14.4 V ≈ 1.49 - tight ratio preserves margin between clamp voltage and downstream IC absolute max ratings |
| Pb-Free (G suffix) Packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile for lead-free assembly |
| Void-Free Transfer-Molded Case | Ensures consistent thermal resistance (RJA = 226°C/W) and mechanical robustness in automated SMT processes |
| UL 497B Recognition | Validated for protector-class applications in safety-critical isolated loops (e.g., PLC analog I/O, fieldbus gateways) |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus |
|---|---|
Use Scenario: 24 V DC input rail exposed to load dump transients up to 120 V for 400 ms in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients before DC-DC converter input stage. Use Value: 21.5 V clamping at 27.9 A limits stress on 36 V-rated input capacitors and MOSFETs during ISO 7637-2 Pulse 5a events. | Use Scenario: CAN_H/CAN_L differential pair routed through harness connectors susceptible to ESD and coupled noise. IC Role / Device Role / Timing Role: One 1SMB13AT3 per line (CAN_H–GND, CAN_L–GND) providing common-mode surge suppression. Use Value: <1.0 ns response prevents >21.5 V common-mode spikes from violating ISO 11898-2 receiver common-mode range (−2 V to +7 V). |
| Medical Equipment Isolated Sensor Interface | Programmable Logic Controller (PLC) Analog Input Channel |
Use Scenario: 4–20 mA current loop feeding isolated ADC inputs in patient-monitoring devices with reinforced insulation barriers. IC Role / Device Role / Timing Role: TVS mounted on primary side of isolation barrier to absorb surges before optocoupler or digital isolator inputs. Use Value: UL 497B recognition validates safe operation in Class II medical equipment where secondary-side fault currents must remain below 100 µA. | Use Scenario: 0–10 V analog input channel receiving signals from factory-floor sensors subject to 4 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Clamping device between input pin and AGND, upstream of precision op-amp buffer stage. Use Value: 5.0 µA max leakage at 13 V VRWM avoids gain error or offset drift in 1 MΩ input impedance circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ13A | Same SMB package, identical VRWM (13 V) and VC (21.5 V), but rated for 600 W per JEDEC standard (vs. ON Semi's proprietary 1 ms pulse definition) | No UL 497B recognition; limited to non-isolated loop applications | Select when UL certification is not required and sourcing flexibility across multiple franchises is prioritized |
| P6SMB13A | Identical electrical specs and SMB footprint, but manufactured by Vishay; 5.0 µA IR same, 21.5 V VC same, 27.9 A IPP same | UL 497B recognized but under File E144273 - validated for same isolated loop use cases | Preferred for dual-sourcing strategies in medical or industrial designs requiring audit-ready compliance documentation |
Compared with SMBJ13A and P6SMB13A, the 1SMB13AT3 offers identical clamping performance and thermal metrics but distinguishes itself via ON Semiconductor's exclusive Surmetic molding process (enhanced moisture resistance) and direct alignment with UL 497B QVGQ2 listing scope - critical for certified isolated interface modules.
Availability
1SMB13AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control units, medical sensor interfaces, and programmable logic controller analog inputs requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB13AT3 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and medical markets.
The 1SMB13AT3 belongs to the SMB series of unidirectional TVS diodes engineered specifically for high-energy transient suppression in harsh environments - emphasizing reliability under repeated surge stress, UL-certified isolation barrier compatibility, and SMT manufacturability.
FAQ
What is the maximum clamping voltage of the 1SMB13AT3 under full-rated surge conditions?
The 1SMB13AT3 exhibits a maximum clamping voltage (VC) of 21.5 V when subjected to its rated peak pulse current (IPP) of 27.9 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and represents the highest voltage imposed on protected circuitry during worst-case surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum voltage ratings. The 1SMB13AT3 datasheet specifies this VC value at TA = 25°C with strict test conditions to ensure repeatability.
Does the 1SMB13AT3 meet UL 497B requirements for isolated loop protection?
Yes, the 1SMB13AT3 carries Underwriters Laboratories recognition under UL 497B (File #E210057, category QVGQ2) for protector-class applications in isolated loops. This certification confirms successful completion of rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation - distinguishing it from generic TVS diodes with only flammability-rated packaging. The 1SMB13AT3 is explicitly approved for use in medical equipment, process controllers, and telecom interfaces where galvanic isolation integrity must be maintained during surge events.
What is the thermal resistance and power derating behavior of the 1SMB13AT3?
The 1SMB13AT3 has a junction-to-ambient thermal resistance (RJA) of 226°C/W on a standard FR-4 board with ON Semiconductor's minimum recommended footprint. Its DC power dissipation is rated at 0.55 W at 25°C ambient, derating linearly by 4.4 mW/°C above that temperature until reaching zero at 150°C. For reliable operation, designers must verify PCB copper area, trace width, and airflow to maintain junction temperature below 150°C - especially under repetitive surge conditions where average power becomes limiting. The 1SMB13AT3 datasheet provides detailed derating curves in Figure 3.
How does the 1SMB13AT3 compare to bidirectional TVS diodes in surge protection design?
The 1SMB13AT3 is unidirectional and optimized for DC-biased lines like power rails or single-ended signal paths where reverse polarity is not expected. Unlike bidirectional variants (e.g., 1SMB13CAT3), it provides lower capacitance and tighter clamping in the forward direction but offers no protection against negative-going transients. In applications such as 24 V industrial power inputs or CAN bus lines referenced to ground, the 1SMB13AT3 delivers superior clamping efficiency and lower leakage than bidirectional alternatives - making it the preferred choice when circuit topology permits polarity-aware placement.
Is the 1SMB13AT3 suitable for IEC 61000-4-5 surge immunity testing?
Yes, the 1SMB13AT3 is designed to withstand IEC 61000-4-5 Combination Wave (1.2/50 µs voltage, 8/20 µs current) surges up to Level 4 (4 kV line-to-earth). Its 600 W peak power rating corresponds to the energy delivered by a 2 Ω source impedance at 4 kV, and its 21.5 V clamping voltage ensures protected circuitry remains within safe operating limits. When implemented with low-inductance PCB layout - short traces, ground plane proximity, and direct connection to chassis or system ground - the 1SMB13AT3 reliably passes system-level surge testing per IEC 61000-4-5 without degradation or parametric shift.
1SMB13AT3 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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 27.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1160pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB13AT3 FAQ
1.How can I place an order for 1SMB13AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB13AT3 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 1SMB13AT3 reliable?
The price and inventory of 1SMB13AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB13AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB13AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB13AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB13AT3?
1SMB13AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB13AT3 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 1SMB13AT3?
For technical support, including 1SMB13AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB13AT3 requirements.
6.How does Aetrix verify that 1SMB13AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB13AT3 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 1SMB13AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB13AT3?
All 1SMB13AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB13AT3, 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 1SMB13AT3 part is unused and in its original packaging.
Return procedure for 1SMB13AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB13AT3 Tags
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