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onsemi 1SMA10AT3
- Part No.:
- 1SMA10AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMA10AT3.pdf
- Description:
- TVS 400W 10V UNIDIRECT SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,468
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Product details
Overview
1SMA10AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 10 V working peak reverse voltage (VRWM), 11.1–12.3 V breakdown voltage (VBR) at 1 mA test current, 17.0 V clamping voltage (VC) at 23.5 A peak pulse current (IPP), and sub-1 ns response time. It is used in automotive power supply protection and industrial I/O interface surge suppression.
For engineers reviewing the 1SMA10AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to protected IC's absolute maximum rating, IPP capability under IEC 61000-4-5 waveform, and SMA package thermal performance on FR-4 PCBs.
Technical Context
The 1SMA10AT3 operates as a unidirectional avalanche diode, conducting only during reverse overvoltage events above its VBR threshold while remaining high-impedance under normal bias. Its low zener impedance and fast <1 ns response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges.
It is rated for 400 W peak pulse power (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature. The device uses ON Semiconductor's Surmetic™ SMA package (Case 403D-02), optimized for top-slide or bottom-mount placement on surface-mount PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 10 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail or signal swing. |
| VBR @ IT=1 mA | 11.1–12.3 V - Avalanche breakdown range; defines minimum overvoltage threshold for reliable conduction. |
| VC @ IPP=23.5 A | 17.0 V - Clamped voltage during 400 W transient; determines maximum stress on downstream components. |
| IPP | 23.5 A - Peak pulse current supported at 10/1000 µs waveform; correlates to IEC 61000-4-5 Level 4 immunity. |
| Response Time | <1 ns - Enables suppression of nanosecond-scale ESD events before protected circuitry is damaged. |
| ESD Rating | Class 3 (>16 kV HBM) - Validated robustness against human-body-model electrostatic discharge. |
| Package | SMA (Case 403D-02) - Surface-mount plastic package with flat handling surface and cathode band marking. |
Pinout & Package
The 1SMA10AT3 is a two-terminal unidirectional TVS diode in the SMA (DO-214AC) package. Cathode is marked by a molded polarity band; anode is unmarked. The device mounts directly to PCB pads with no internal pins-only two solderable terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VRWM exceeded. |
| Anode | Reference node / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports robust IEC 61000-4-5 surge immunity without derating on standard FR-4 layouts. |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage overshoot during clamping, reducing risk to downstream logic or analog ICs. |
| Flat handling surface | Enables precise pick-and-place alignment and consistent solder joint formation in automated assembly. |
| Pb-free option (1SMA10AT3G) | Meets RoHS compliance requirements without sacrificing electrical or thermal performance. |
| −65°C to +150°C operating range | Validated for under-hood automotive and industrial environments with wide thermal cycling. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump and alternator ripple transients. IC Role / Device Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: 17.0 V clamping ensures MCU and CAN transceivers remain within their 24 V absolute max rating during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges in factory automation. IC Role / Device Role: Front-end transient suppressor on dry-contact or optocoupler input lines. Use Value: 23.5 A IPP handles repetitive 1 kV/500 A surges per IEC 61000-4-4, extending input stage reliability. |
| Medical Equipment Power Entry | Point-of-Sale Terminal USB Port |
Use Scenario: Safeguarding AC/DC adapter outputs feeding sensitive analog front-ends in diagnostic devices. IC Role / Device Role: Secondary-level TVS after primary MOV filtering, targeting fast-rising ESD and switching noise. Use Value: Sub-1 ns response prevents latch-up in precision ADCs and op-amps exposed to 8 kV contact discharge. | Use Scenario: Adding surge resilience to 5 V USB VBUS lines in retail kiosks subject to accidental hot-plug and cable ESD. IC Role / Device Role: Low-capacitance unidirectional suppressor between VBUS and GND, upstream of USB controller. Use Value: 10 V VRWM allows full 5 V operation while clamping 15 kV HBM events to ≤17 V, preserving USB 2.0 signaling integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ10A | Same VRWM (10 V), higher IPP (32.4 A), larger SMB package (higher thermal mass) | Better suited for higher-energy surges; requires larger PCB footprint | Choose when 400 W pulse energy exceeds 1SMA10AT3's capability or board layout permits SMB size |
| P6SMB10A | Identical electrical specs, same SMA package, but manufactured by STMicroelectronics | No functional or mechanical difference; dual-sourcing option with identical footprint and ratings | Use for supply chain diversification without redesign or qualification retesting |
Compared with SMBJ10A and P6SMB10A, the 1SMA10AT3 offers optimal balance of compact SMA footprint, verified 400 W surge handling, and ON Semiconductor's long-standing automotive qualification-making it ideal for space-constrained, cost-sensitive industrial and consumer designs requiring proven reliability.
Availability
1SMA10AT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC digital I/O, and medical equipment power entry requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA10AT3 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1SMA10AT3 belongs to ON Semiconductor's SMA-series transient voltage suppressors-a family engineered for high-reliability, surface-mount surge protection in harsh environments with strict space and thermal constraints.
FAQ
What is the clamping voltage of the 1SMA10AT3 and how is it measured?
The 1SMA10AT3 has a maximum clamping voltage (VC) of 17.0 V, measured at a peak pulse current (IPP) of 23.5 A using a 10/1000 µs waveform. This value represents the maximum voltage seen across the device during a standardized surge event and is critical for ensuring protected circuits remain below their absolute maximum voltage ratings. The 1SMA10AT3 achieves this clamping performance while maintaining low dynamic impedance and sub-1 ns response.
Is the 1SMA10AT3 suitable for bidirectional transient suppression?
No, the 1SMA10AT3 is a unidirectional TVS diode and conducts only in reverse breakdown. For bidirectional protection, ON Semiconductor offers the 1SMA10CAT3 variant, which provides symmetrical clamping for AC-coupled or floating signal lines. Using the 1SMA10AT3 in bidirectional applications risks failure during positive transients, as it lacks forward conduction capability beyond its 3.5 V forward voltage limit.
What is the thermal derating behavior of the 1SMA10AT3 above 75°C?
The 1SMA10AT3's DC power dissipation is rated at 1.5 W at 75°C case temperature, with linear derating of 20 mW/°C above that point. At 125°C case temperature, its usable DC power drops to 0.5 W. This derating applies to steady-state conditions-not transient pulses-and reflects junction-to-lead thermal resistance of 20°C/W. The 1SMA10AT3 remains fully functional for surge suppression up to +150°C junction temperature.
Does the 1SMA10AT3 meet automotive qualification standards?
The 1SMA10AT3 is widely deployed in automotive applications and meets key stress requirements including AEC-Q200 stress testing for passive components, −65°C to +150°C operating range, and ISO 7637-2 Pulse 5a compatibility when applied with appropriate layout and grounding. While not formally AEC-Q200 certified as a standalone part, its design, manufacturing process, and qualification history align with automotive-grade reliability expectations for TVS diodes.
How does the 1SMA10AT3 compare to the 1SMA10AT3G variant?
The 1SMA10AT3G is the Pb-free version of the 1SMA10AT3, sharing identical electrical specifications, thermal performance, and mechanical dimensions. Both use the same Surmetic™ SMA package (Case 403D-02) and are compatible with standard lead-free reflow profiles. The "G" suffix denotes RoHS-compliant materials and plating; no design or layout changes are needed when substituting 1SMA10AT3G for 1SMA10AT3 in new or existing PCB assemblies.
1SMA10AT3 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:
- -
1SMA10AT3 FAQ
1.How can I place an order for 1SMA10AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA10AT3 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 1SMA10AT3 reliable?
The price and inventory of 1SMA10AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA10AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA10AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA10AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA10AT3?
1SMA10AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA10AT3 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 1SMA10AT3?
For technical support, including 1SMA10AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA10AT3 requirements.
6.How does Aetrix verify that 1SMA10AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA10AT3 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 1SMA10AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA10AT3?
All 1SMA10AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA10AT3, 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 1SMA10AT3 part is unused and in its original packaging.
Return procedure for 1SMA10AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA10AT3 Tags
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