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onsemi 1SMA13AT3
- Part No.:
- 1SMA13AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA13AT3.pdf
- Description:
- TVS DIODE 13VWM 21.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
1SMA13AT3 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 13 V working peak reverse voltage (VRWM), 15.15 V nominal breakdown voltage (VBR) at 1 mA test current, 21.5 V clamping voltage (VC) at 18.6 A peak pulse current (IPP), and sub-1 ns response time. It protects voltage-sensitive components in automotive power supplies and industrial control interfaces.
For engineers reviewing the 1SMA13AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, VC vs. device withstand capability, IPP derating at elevated ambient temperature, and SMA package thermal performance on FR-4 PCBs with minimum footprint.
Technical Context
The 1SMA13AT3 operates as a unidirectional avalanche diode, conducting only during negative transients relative to its anode–cathode polarity. Its clamping action begins at VRWM = 13 V and fully engages at VBR = 15.15 V (min) under 1 mA DC test current, limiting surge voltages to VC ≤ 21.5 V at IPP = 18.6 A (10/1000 µs waveform).
Thermal design relies on junction-to-lead resistance (RJL = 20 °C/W) and junction-to-ambient resistance (RJA = 250 °C/W) with derating starting at 75 °C for power dissipation and 25 °C for ambient-limited operation. The device uses ON Semiconductor's Surmetic™ SMA package (Case 403D-02), optimized for top-slide or bottom-mount placement on automated SMT lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 400 W @ 1 ms, 10/1000 µs waveform - defines maximum single-event surge energy handling |
| Working Peak Reverse Voltage (VRWM) | 13 V - maximum continuous DC or peak AC voltage the device blocks without clamping |
| Breakdown Voltage (VBR) | 14.4–15.9 V @ 1 mA - threshold where avalanche conduction initiates; nominal 15.15 V |
| Clamping Voltage (VC) | 21.5 V @ IPP = 18.6 A - maximum voltage seen by protected circuit during rated surge |
| Response Time | < 1 ns - ensures clamping activation before most IC damage thresholds are exceeded |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct I/O line protection in non-isolated systems |
| Package | SMA (Case 403D-02), surface-mount - 4.06 × 2.29 × 1.91 mm body with cathode band marking |
Pinout & Package
SMA package (Case 403D-02) is a flat, low-profile, plastic-molded surface-mount diode housing with cathode indicated by a molded band. Designed for top-slide or bottom-board mounting on standard SMT lines with Pb-free solder compatibility and 260°C/10s reflow tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias or surge conduction | Connected to lower-potential side of protected line; must handle 40 A non-repetitive forward surge |
| Cathode | Current exit terminal; marked with polarity band | Connected to higher-potential rail (e.g., VCC); defines clamping reference point for VRWM and VC |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V DC rails |
| Low zener impedance & fast response | Minimizes voltage overshoot during nanosecond-scale transients, preserving downstream logic thresholds |
| Cathode polarity band + flat handling surface | Ensures consistent orientation and accurate placement in high-speed pick-and-place assembly |
| Pb-free (1SMA13AT3G) and RoHS-compliant variants | Supports global environmental compliance without sacrificing surge performance or thermal reliability |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Module Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V/100 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp transients before they reach PMIC input. Use Value: Clamps to 21.5 V at 18.6 A, maintaining safe margin below 24 V-rated input stages while surviving 400 W surges. |
Use Scenario: 24 V digital input channels in programmable logic controllers subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Discrete TVS mounted at connector entry point to shunt induced common-mode transients to chassis ground. Use Value: Sub-1 ns response prevents false triggering of optocouplers or Schmitt triggers; 13 V VRWM matches 24 V ±10% nominal range. |
| Medical Equipment Power Supply Input | Point-of-Sale Terminal USB Power Line |
Use Scenario: Auxiliary 5 V/12 V SMPS inputs in diagnostic imaging devices requiring IEC 60601-1 surge immunity. IC Role / Device Role / Timing Role: Secondary-side TVS on DC output rail to suppress coupling from primary-side switching noise or external EFT bursts. Use Value: 15.15 V VBR ensures stable clamping without premature conduction during normal 12 V ±5% regulation. |
Use Scenario: VBUS line protection in retail kiosks with hot-plug USB peripherals susceptible to contact ESD. IC Role / Device Role / Timing Role: Series TVS on 5 V VBUS path to absorb ±15 kV contact discharge per IEC 61000-4-2. Use Value: Class 3 HBM (>16 kV) and low clamping voltage (21.5 V) prevent USB PHY latch-up or overvoltage damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ13A (ON Semiconductor) | Same VRWM (13 V) and VBR range, but SMB package (higher thermal mass, RJA = 150 °C/W) | Better sustained power handling; requires larger PCB footprint | Choose when board space allows and thermal cycling stress exceeds SMA limits |
| P6SMB13A (Littelfuse) | Identical electrical specs (VRWM = 13 V, VC = 21.5 V @ 18.6 A), same SMA package, AEC-Q200 qualified | Automotive-qualified variant with extended temperature validation and PPAP support | Choose for automotive OEM designs requiring certified qualification and supply chain traceability |
Compared with 1SMA13AT3, SMBJ13A offers improved thermal derating but increases layout area by ~40%, while P6SMB13A delivers identical protection performance with formal AEC-Q200 compliance-critical for Tier 1 automotive BOMs where qualification documentation is mandatory.
Availability
1SMA13AT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O modules, medical equipment power supplies, and point-of-sale terminal USB lines requiring stable component supply across long production lifecycles.
Supply support for 1SMA13AT3 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMAxxAT3 series belongs to onsemi's transient voltage suppressor product line, engineered specifically for cost-sensitive, high-volume SMT applications demanding reliable 400 W surge clamping in compact SMA packages.
FAQ
What is the maximum clamping voltage of the 1SMA13AT3 under rated surge conditions?
The 1SMA13AT3 has a maximum clamping voltage (VC) of 21.5 V when subjected to its rated peak pulse current (IPP) of 18.6 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a worst-case transient event. The 1SMA13AT3 maintains this clamping performance without degradation under repeated non-repetitive surges within its specified power limit.
How does the 1SMA13AT3 differ from bidirectional TVS diodes like the 1SMA13CAT3?
The 1SMA13AT3 is unidirectional and functions as a Zener-type suppressor that clamps only negative transients relative to its cathode, making it ideal for DC power rail protection where polarity is fixed. In contrast, the 1SMA13CAT3 is bidirectional and symmetrically clamps both positive and negative transients, suited for AC signal lines or data buses. The 1SMA13AT3 exhibits lower leakage and tighter VBR tolerance than its bidirectional counterpart due to its single-junction structure.
Can the 1SMA13AT3 be used in automotive applications requiring AEC-Q200 qualification?
The standard 1SMA13AT3 is not AEC-Q200 qualified; however, onsemi offers the functionally identical P6SMB13A (Littelfuse) and automotive-grade variants such as the SMAJ13A-Q, both certified to AEC-Q200. For automotive designs requiring formal qualification, those alternatives provide the same 13 V VRWM, 21.5 V clamping, and SMA package while delivering validated reliability data, extended temperature testing, and PPAP documentation required by Tier 1 suppliers.
What is the recommended PCB footprint for the 1SMA13AT3 according to ON Semiconductor?
ON Semiconductor specifies a minimum copper pad footprint for the 1SMA13AT3 based on Case 403D-02 dimensions: 4.83 mm × 2.29 mm pad length and width, with 0.5 mm solder mask expansion. The recommended layout uses a 1″ square copper pad on FR-4 for thermal testing, yielding RJL = 20 °C/W. For production use, the datasheet references the "403B case outline dimensions spec" as the basis for thermal optimization, and the footprint must accommodate the cathode band orientation for automated optical inspection.
Does the 1SMA13AT3 require derating at elevated ambient temperatures?
Yes, the 1SMA13AT3 requires derating above 25 °C ambient temperature for DC power dissipation (PD = 0.5 W at TA = 25 °C, derated at 4.0 mW/°C) and above 75 °C for lead-temperature-limited operation (PD = 1.5 W at TL = 75 °C, derated at 20 mW/°C). Surge current capability also decreases per Figure 3 in the datasheet: at 100 °C ambient, peak pulse current drops to ~75% of the 25 °C rating. These derating curves must be applied in thermal simulations for high-density or sealed enclosure designs.
1SMA13AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- 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):
- 18.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 860pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA13AT3 FAQ
1.How can I place an order for 1SMA13AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA13AT3 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 1SMA13AT3 reliable?
The price and inventory of 1SMA13AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA13AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA13AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA13AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA13AT3?
1SMA13AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA13AT3 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 1SMA13AT3?
For technical support, including 1SMA13AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA13AT3 requirements.
6.How does Aetrix verify that 1SMA13AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA13AT3 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 1SMA13AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA13AT3?
All 1SMA13AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA13AT3, 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 1SMA13AT3 part is unused and in its original packaging.
Return procedure for 1SMA13AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA13AT3 Tags
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