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onsemi 1SMB5.0AT3
- Part No.:
- 1SMB5.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMB5.0AT3.pdf
- Description:
- TVS DIODE 5V 9.2V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,780
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Product details
Overview
1SMB5.0AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and switching transients. It features a 5.0 V working peak reverse voltage (VRWM), 9.2 V maximum clamping voltage at 65.2 A peak pulse current (VC @ IPP), and <1.0 ns response time - deployed in power supplies, automotive ECUs, and industrial I/O interfaces.
For engineers reviewing the 1SMB5.0AT3 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 recognition for isolated loop protection, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The 1SMB5.0AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its 6.4–7.0 V breakdown voltage (VBR @ IT = 10 mA). Its low zener impedance and fast intrinsic response enable sub-nanosecond turn-on with minimal overshoot when mounted close to protected circuitry.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (IFSM), and maintains <5.0 µA leakage at VRWM. Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and FR-4 board mounting per CASE 403A footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 5.0 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system nominal DC voltage. |
| VBR @ IT=10 mA | 6.4–7.0 V - Zener breakdown range defining reliable conduction onset; ensures predictable clamping threshold. |
| VC @ IPP=65.2 A | 9.2 V - Maximum clamped voltage during 600 W transient; determines worst-case stress on downstream ICs. |
| PPK | 600 W - Peak pulse power handling (1 ms, 10/1000 µs waveform); defines single-event surge robustness. |
| Response Time | <1.0 ns - Intrinsic device turn-on delay; critical for protecting high-speed logic and analog inputs. |
| ESD Rating | Class 3 HBM (>16 kV) - Confirmed electrostatic discharge immunity level per JEDEC JS-001. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection, including strike voltage, endurance, and dielectric tests. |
Pinout & Package
Package: SMB (CASE 403A), surface-mount, Pb-free, void-free thermosetting plastic with modified L-bend leads and cathode polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction or transient clamping | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration. |
| Cathode | Current exit during reverse-biased clamping | Connected to protected line (e.g., 5 V rail); polarity band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating on standard FR-4 layouts. |
| Clamping voltage ≤9.2 V at 65.2 A | Provides safe margin below 12 V logic IC absolute maximum ratings while maintaining low-voltage system compatibility. |
| UL 497B recognition (QVGQ2) | Validates suitability for telecom and industrial isolated loop protection without additional safety certification effort. |
| ESD immunity >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 requirements for user-accessible ports and front-panel interfaces. |
| SURMETIC™ SMB package | Offers 2.2 mm × 4.3 mm footprint with 25 °C/W junction-to-lead thermal resistance for reliable power dissipation. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O Lines |
|---|---|
Use Scenario: Clamping induced surges on 5 V auxiliary rails during load dump or relay switching in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 5 V rail and chassis ground to shunt transients before reaching DC-DC controller or microcontroller. Use Value: Limits voltage excursion to ≤9.2 V during 65 A surge events, preserving 5 V regulator input stage integrity and avoiding latch-up. |
Use Scenario: Protecting LIN bus transceiver pins and sensor inputs in BCMs exposed to ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Parallel-connected TVS on LIN data line referenced to battery ground, activated within <1 ns of overvoltage onset. Use Value: Maintains signal integrity by clamping to 9.2 V while meeting AEC-Q101 qualification and UL 497B loop isolation requirements. |
| Medical Equipment USB Port ESD Suppression | Programmable Logic Controller (PLC) Digital Input Protection |
Use Scenario: Safeguarding USB 2.0 VBUS and D+/D− lines in patient-monitoring devices against hospital-grade ESD events. IC Role / Device Role / Timing Role: Primary-level TVS on VBUS line only (unidirectional), coordinated with secondary polymer PTC and ferrite bead filtering. Use Value: Absorbs >16 kV HBM discharges without degradation, verified per IEC 61000-4-2 and UL 497B protector category. |
Use Scenario: Protecting 24 V digital input channels in modular PLC backplanes from field-wiring transients and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted directly at terminal block entry point, referenced to 24 V supply rail with series current-limiting resistor. Use Value: Withstands repeated 600 W surges while maintaining ≤5 µA leakage at 24 V, ensuring stable logic threshold detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Same VRWM (5.0 V) and unidirectional topology, but lower 400 W PPK rating and higher 10.6 V clamping voltage at 43.4 A. | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); not UL 497B recognized. | Select when cost sensitivity outweighs need for 600 W surge headroom or regulatory compliance. |
| 1.5SMC5.0A | Higher 1500 W PPK rating and identical 5.0 V VRWM, but larger SMC package (7.1 mm × 6.2 mm) and 11.2 V clamping voltage at 134 A. | Better for high-energy surges but requires more PCB area and exhibits higher clamping stress on protected ICs. | Choose when system-level testing confirms need for >600 W capability and layout allows SMC footprint. |
Compared with SMAJ5.0A and 1.5SMC5.0A, the 1SMB5.0AT3 delivers optimal balance of compact SMB size, 600 W surge capacity, 9.2 V clamping, and UL 497B certification - making it preferred for space-constrained industrial and automotive modules requiring certified loop protection.
Availability
1SMB5.0AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control units, medical USB interfaces, and PLC digital input modules requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB5.0AT3 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 1SMB5.0AT3 belongs to the SMB-series Zener TVS family engineered for high-reliability transient suppression in harsh environments - targeting applications where UL recognition, AEC-Q101 qualification, and consistent clamping performance are mandatory.
FAQ
What is the working peak reverse voltage (VRWM) of the 1SMB5.0AT3?
The 1SMB5.0AT3 has a VRWM of 5.0 V, meaning it remains in high-impedance blocking mode up to this DC or continuous peak reverse voltage. This value is selected to match or slightly exceed the nominal voltage of the protected line - for example, a 5 V rail - ensuring no leakage conduction during normal operation while enabling immediate clamping above this threshold. The 1SMB5.0AT3 maintains <5.0 µA leakage at VRWM.
How does the clamping voltage of the 1SMB5.0AT3 compare to its breakdown voltage?
The 1SMB5.0AT3 has a breakdown voltage (VBR) range of 6.4–7.0 V at 10 mA test current, while its maximum clamping voltage (VC) is 9.2 V at 65.2 A peak pulse current. This ~2.2–4.2 V differential reflects the device's dynamic impedance under surge conditions and defines the upper voltage limit imposed on protected circuitry. Engineers use VC - not VBR - to verify margin against downstream IC absolute maximum ratings in the 1SMB5.0AT3 application.
Is the 1SMB5.0AT3 certified for safety-critical protection circuits?
Yes, the 1SMB5.0AT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric withstand, and discharge performance - confirming its suitability for telecom, industrial control, and medical equipment where regulatory compliance is mandatory. The 1SMB5.0AT3 meets these requirements as shipped.
What package type and mounting considerations apply to the 1SMB5.0AT3?
The 1SMB5.0AT3 uses the SMB package (CASE 403A), a surface-mount plastic case with 2.2 mm × 4.3 mm footprint, cathode polarity band, and modified L-bend leads. Recommended soldering uses 260 °C for 10 seconds max; thermal performance depends on FR-4 board layout with ON Semiconductor's minimum recommended copper pad. Proper placement - within 2 mm of protected IC pins - minimizes parasitic inductance and overshoot in the 1SMB5.0AT3 application.
Does the 1SMB5.0AT3 meet automotive reliability standards?
Yes, the SZ1SMB5.0AT3G variant (part of the same series) is AEC-Q101 qualified and PPAP capable, confirming robustness for automotive applications such as body control modules and infotainment I/O protection. While the base 1SMB5.0AT3 shares identical electrical specs and construction, automotive designs should specify the SZ-prefix version to ensure controlled manufacturing, traceability, and qualification documentation. Both variants use the same 1SMB5.0AT3 die and SMB package.
1SMB5.0AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1SMB5.0AT3 FAQ
1.How can I place an order for 1SMB5.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5.0AT3 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 1SMB5.0AT3 reliable?
The price and inventory of 1SMB5.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5.0AT3?
1SMB5.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5.0AT3 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 1SMB5.0AT3?
For technical support, including 1SMB5.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5.0AT3 requirements.
6.How does Aetrix verify that 1SMB5.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5.0AT3 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 1SMB5.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5.0AT3?
All 1SMB5.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5.0AT3, 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 1SMB5.0AT3 part is unused and in its original packaging.
Return procedure for 1SMB5.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5.0AT3 Tags
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onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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