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onsemi 1SMA13AT3G
- Part No.:
- 1SMA13AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA13AT3G.pdf
- Description:
- TVS DIODE 13VWM 21.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:336,151
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Product details
Overview
1SMA13AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed to protect sensitive electronics against ESD and surge events. It features a 13 V working peak reverse voltage (VRWM), 15.15 V nominal breakdown voltage (VBR) at 1 mA, 21.5 V clamping voltage (VC) at 18.6 A peak pulse current, and sub-1 ns response time - deployed in automotive power supply rails and industrial I/O interfaces.
For engineers reviewing the 1SMA13AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. device withstand rating, surge current capability under 10/1000 µs waveform, and SMA package thermal performance on FR-4 PCBs.
Technical Context
This TVS diode operates in avalanche breakdown mode to clamp transients above its VBR threshold while maintaining low dynamic impedance. Its unidirectional configuration provides reverse-biased protection only, requiring correct polarity placement across DC lines.
It complies with AEC-Q101 for automotive use and delivers Class 3 HBM ESD immunity (>16 kV). The device is optimized for single-pulse 10/1000 µs surge waveforms per R.E.A., with derating applied above 75°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 13 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's max DC or peak AC voltage. |
| VBR @ IT=1 mA | 15.15 V (nominal) - Measured breakdown voltage ensures predictable turn-on threshold under standardized test conditions. |
| VC @ IPP=18.6 A | 21.5 V - Clamping voltage during 400 W surge; determines maximum stress imposed on protected downstream ICs. |
| Peak Pulse Power | 400 W @ 1 ms - Sustains high-energy transients such as ISO 7637-2 Load Dump or IEC 61000-4-5 surges without failure. |
| Junction Capacitance | 860 pF @ 0 V - Low enough for <100 MHz signal integrity in power rail protection; not suitable for high-speed data lines. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets stringent electrostatic discharge immunity requirements for automotive and industrial end equipment. |
Pinout & Package
The 1SMA13AT3G is housed in an SMA (DO-214AC) surface-mount package (Case 403D), featuring a low-profile, flat-handling design compatible with top-slide or bottom-board mounting. Polarity is marked by a cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal Zener junction | Connected to higher-potential side of protected line; clamps when reverse voltage exceeds VBR. |
| Anode | Cathode of internal Zener junction | Connected to ground or lower-potential reference; completes conduction path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects DC power rails without interfering with forward-biased operation; avoids leakage during normal conduction. |
| 400 W peak pulse power | Withstands automotive load dump and industrial surge events per ISO 7637-2 and IEC 61000-4-5 standards. |
| Sub-1 ns response time | Engages before most semiconductor damage mechanisms initiate, enabling effective protection of fast-switching ICs. |
| AEC-Q101 qualified | Validated for automotive underhood and powertrain applications with extended temperature and reliability testing. |
Applications
| Automotive Power Supply Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients up to ±120 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp reverse transients before they reach LDOs or microcontrollers. Use Value: Limits voltage seen by downstream components to ≤21.5 V during 400 W surges, preserving functional safety compliance. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges and ESD events in factory automation. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input channels, mounted adjacent to connector entry points. Use Value: Absorbs >16 kV HBM ESD strikes and 1 kV/50 Ω fast transients without degradation, ensuring long-term channel reliability. |
| Medical Equipment Power Rails | Telecom Power Interface |
Use Scenario: Safeguarding auxiliary 5–24 V rails in diagnostic imaging systems against coupling from motor drives or switching PSUs. IC Role / Device Role / Timing Role: Secondary-level TVS on regulated outputs, coordinated with primary MOVs and fuses for staged protection. Use Value: Provides precise 13 V VRWM hold-off with 21.5 V clamping to avoid nuisance tripping while meeting IEC 60601-1 creepage requirements. | Use Scenario: Protecting PoE-powered Ethernet ports from lightning-induced surges entering via data pairs or auxiliary power lines. IC Role / Device Role / Timing Role: Discrete unidirectional suppressor on DC bias lines feeding active Ethernet magnetics or PHY power supplies. Use Value: Delivers 400 W surge handling with 860 pF capacitance - low enough to avoid signal distortion on 100BASE-TX links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA13AT3G | Identical electrical specs; AEC-Q101 certified with PPAP documentation support and automotive-specific traceability. | Required for Tier 1 automotive BOMs where change control, lot traceability, and PPAP submission are mandatory. | Select SZ1SMA13AT3G when automotive qualification and manufacturing site control are contractually required. |
| 1.5SMC13A | Same VRWM (13 V) and VC (21.5 V), but in larger SMC (DO-214AB) package with 1500 W peak power rating. | Used where higher surge energy handling is needed, e.g., main board-level protection rather than point-of-load suppression. | Choose 1.5SMC13A when system-level surge tests exceed 400 W or PCB layout allows larger footprint. |
Compared with SZ1SMA13AT3G and 1.5SMC13A, the 1SMA13AT3G offers optimal balance of compact SMA footprint, automotive-grade reliability, and sufficient 400 W surge capacity for point-of-load protection - making it ideal for space-constrained, cost-sensitive industrial and automotive modules.
Availability
1SMA13AT3G is available at Aetrix Electronics and suitable for automotive power management, industrial PLC I/O conditioning, and medical equipment power rail protection requiring stable component supply and long-term lifecycle assurance.
Supply support for 1SMA13AT3G 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 power management, analog, sensor, and discrete devices for automotive, industrial, and cloud power applications.
The 1SMAxxAT3G series belongs to ON Semiconductor's SURMETIC® TVS portfolio, engineered specifically for robust, cost-effective overvoltage protection in harsh environments including automotive engine compartments and factory floors.
FAQ
What is the clamping voltage of the 1SMA13AT3G under maximum surge conditions?
The 1SMA13AT3G exhibits a maximum clamping voltage (VC) of 21.5 V when subjected to its rated peak pulse current of 18.6 A, measured using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components. The 1SMA13AT3G datasheet specifies this parameter in Table 3 under "VC @ IPP".
Is the 1SMA13AT3G suitable for bidirectional signal line protection?
No, the 1SMA13AT3G is a unidirectional TVS diode and is not appropriate for bidirectional signal line protection. It conducts only during reverse-biased overvoltage events and blocks forward current beyond its ~0.85 V forward voltage. For data lines requiring symmetrical clamping (e.g., RS-485, USB, CAN), a bidirectional variant such as 1SMA13CAT3G must be used instead. The 1SMA13AT3G is intended exclusively for DC power rail protection where polarity is fixed.
Does the 1SMA13AT3G meet automotive qualification standards?
Yes, the 1SMA13AT3G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body electronics, infotainment power supplies, and ADAS sensor modules. While the base 1SMA13AT3G meets the stress test requirements, the SZ-prefix variant (SZ1SMA13AT3G) adds enhanced process controls and documentation required for Tier 1 automotive procurement. Both share identical electrical characteristics and package dimensions.
What is the thermal resistance from junction to ambient for the 1SMA13AT3G?
The 1SMA13AT3G has a thermal resistance from junction to ambient (RJA) of 250 °C/W when mounted on a standard FR-4 PCB using ON Semiconductor's minimum recommended footprint. At 25°C ambient, its DC power dissipation is rated at 0.5 W, derating linearly by 4.0 mW/°C above that temperature. This RJA value assumes no copper pour or thermal vias; adding a 1″² copper pad reduces RJA significantly and improves surge survivability. The 1SMA13AT3G datasheet specifies these values in the "Maximum Ratings" table on page 2.
How does the junction capacitance of the 1SMA13AT3G affect high-frequency circuit design?
The 1SMA13AT3G exhibits a typical junction capacitance of 860 pF at 0 V bias, which limits its use to low-to-moderate frequency applications such as DC power rail protection. This capacitance introduces impedance below ~200 MHz and may distort fast digital signals or degrade RF front-end performance if placed on signal paths. It is well-suited for 24 V industrial I/O or automotive battery lines but should be avoided on USB, HDMI, or Ethernet data lines. The 1SMA13AT3G datasheet reports CTyp in the Electrical Characteristics table on page 3.
1SMA13AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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
1SMA13AT3G FAQ
1.How can I place an order for 1SMA13AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA13AT3G 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 1SMA13AT3G reliable?
The price and inventory of 1SMA13AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA13AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA13AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA13AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA13AT3G?
1SMA13AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA13AT3G 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 1SMA13AT3G?
For technical support, including 1SMA13AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA13AT3G requirements.
6.How does Aetrix verify that 1SMA13AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA13AT3G 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 1SMA13AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA13AT3G?
All 1SMA13AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA13AT3G, 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 1SMA13AT3G part is unused and in its original packaging.
Return procedure for 1SMA13AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA13AT3G Tags
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