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onsemi 1SMA8.0AT3G
- Part No.:
- 1SMA8.0AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA8.0AT3G.pdf
- Description:
- TVS DIODE 8VWM 13.6VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,375
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Product details
Overview
1SMA8.0AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping overvoltage transients in DC power rails and signal lines. It features a working peak reverse voltage of 8.0 V, clamping voltage of 13.6 V at 29.4 A peak pulse current, and junction capacitance of 1035 pF at 0 V bias - enabling robust ESD and surge protection in automotive power supplies and industrial control interfaces.
For engineers reviewing the 1SMA8.0AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to IC absolute maximum ratings, Ipp capability under defined 10/1000 µs waveform, and thermal derating above 75°C ambient.
Technical Context
The 1SMA8.0AT3G operates as a unidirectional Zener-based TVS diode with avalanche breakdown behavior, triggered when reverse voltage exceeds its 8.89–9.83 V breakdown range at 1 mA test current. Its low zener impedance and sub-1 ns response time enable fast clamping of ESD (Class 3 >16 kV HBM) and lightning-induced surges.
It is rated for 400 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal resistance of 250 °C/W junction-to-ambient (on FR-4 board) and 50 °C/W junction-to-lead. The device uses a void-free transfer-molded SMA package with cathode polarity band marking and Pb-free construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.0 V - maximum continuous reverse operating voltage before clamping begins; must be ≥ circuit's normal DC rail voltage. |
| VBR @ IT=1 mA | 8.89–9.83 V - guaranteed breakdown range; defines onset of avalanche conduction under controlled test conditions. |
| VC @ IPP=29.4 A | 13.6 V - clamped voltage during 400 W transient; determines maximum stress imposed on downstream components. |
| IPP | 29.4 A - peak pulse current supported at 13.6 V clamping; derived from 400 W / 13.6 V calculation per 10/1000 µs waveform. |
| CJ @ 0 V, 1 MHz | 1035 pF - junction capacitance affecting high-frequency signal integrity; relevant for data line protection (e.g., CAN, RS-485). |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct handling in manufacturing environments without additional ESD mitigation. |
| TJ Range | −65 °C to +150 °C - supports operation in under-hood automotive and industrial temperature extremes. |
Pinout & Package
Package: SMA (Case 403D), surface-mount, unidirectional, cathode indicated by molded polarity band. Dimensions: 4.06–4.57 mm length × 2.29–2.92 mm width × 1.52 mm max height. RoHS-compliant, Pb-free, moisture sensitivity level (MSL) not specified in source.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Anode of internal Zener junction | Connected to protected line; reverse-biased during transient; conducts surge current to ground when VRWM exceeded. |
| Anode | Cathode of internal Zener junction | Typically tied to system ground or lower-potential reference; completes current path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables suppression of high-energy transients such as ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems. |
| Clamping voltage ≤13.6 V at 29.4 A | Protects 12 V-rated ICs (e.g., microcontrollers, CAN transceivers) whose absolute max rating is typically 16–18 V. |
| Response time <1 ns | Fast enough to limit voltage overshoot before sensitive logic or analog circuits experience latch-up or damage. |
| AEC-Q101 qualified (SZ-prefix variant) | Validated for automotive use; 1SMA8.0AT3G shares identical electrical specs and package with SZ1SMA8.0AT3G. |
| Flat handling surface | Ensures consistent pick-and-place accuracy during automated SMT assembly, reducing tombstoning risk. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump transients up to 60 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp overvoltage before it reaches MCU power pins. Use Value: Limits peak rail voltage to ≤13.6 V during 29.4 A surge, preventing brownout reset or permanent damage to 12 V-rated regulators and microcontrollers. |
Use Scenario: 24 V digital input modules receiving signals from field sensors subject to inductive switching spikes. IC Role / Device Role / Timing Role: TVS mounted across input terminals to shunt transient energy away from optocoupler input LED and series current-limiting resistor. Use Value: Clamps 1 kV/1 µs spikes to safe levels within 1 ns, preserving signal integrity and extending optocoupler lifetime in harsh factory environments. |
| Medical Equipment Power Entry | Telecom DC Power Feeds |
Use Scenario: AC/DC adapter output stage feeding isolated DC-DC converters in patient-connected devices. IC Role / Device Role / Timing Role: Secondary-side TVS on +5 V or +3.3 V distribution net to absorb coupling noise from primary-side MOSFET switching. Use Value: Suppresses common-mode transients induced by fast-switching power stages, maintaining low-noise supply for analog front-ends and ADC references. |
Use Scenario: -48 V telecom power feed entering remote radio units, susceptible to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary protection device on power entry PCB, upstream of DC-DC converter and hot-swap controller. Use Value: Handles 400 W surges while maintaining <10 nA leakage at -48 V, ensuring minimal standby power loss and reliable startup after transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA8.0AT3G | Identical electrical specs and package; AEC-Q101 qualified with PPAP capability; marked with SZ prefix for automotive traceability. | Required for automotive OEM designs requiring certified qualification and change control documentation. | Select 1SMA8.0AT3G for industrial/commercial use; choose SZ1SMA8.0AT3G when automotive compliance is mandatory. |
| SMBJ8.0A | Same VRWM (8.0 V) and VC (13.6 V), but higher 600 W peak power rating and SMB package (larger footprint, 4.58 mm × 3.94 mm vs. SMA's 4.32 mm × 2.60 mm). | Better suited for higher-energy transients where board space allows; less suitable for dense layouts constrained by SMA footprint. | Use SMBJ8.0A when surge energy exceeds 400 W margin or thermal dissipation requires larger pad area; retain 1SMA8.0AT3G for space-constrained 12 V rail protection. |
Compared with SZ1SMA8.0AT3G, the 1SMA8.0AT3G offers identical protection performance without automotive qualification overhead; versus SMBJ8.0A, it trades peak power headroom for smaller PCB area and lower profile - critical for compact power modules and portable medical devices.
Availability
1SMA8.0AT3G is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and medical equipment power entry requiring stable component supply and consistent surge immunity performance across production batches.
Supply support for 1SMA8.0AT3G 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 solutions for automotive, industrial, and communications markets.
The 1SMA8.0AT3G belongs to ON Semiconductor's SMA-series TVS family, engineered specifically for cost-sensitive, high-volume surge protection in DC power systems where reliability under repetitive transients and thermal stability are essential.
FAQ
What is the maximum working peak reverse voltage (VRWM) of the 1SMA8.0AT3G?
The 1SMA8.0AT3G has a VRWM of 8.0 V, meaning it remains in high-impedance state up to this reverse voltage and begins clamping only when transients exceed this threshold. This value is confirmed in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet, and ensures compatibility with nominal 5 V or 12 V systems where operating voltage must stay below VRWM to avoid leakage or premature conduction.
What clamping voltage does the 1SMA8.0AT3G exhibit during a 400 W transient?
The 1SMA8.0AT3G clamps to 13.6 V at a peak pulse current of 29.4 A, corresponding to the standard 10/1000 µs waveform used for 400 W rating. This VC value is measured under controlled test conditions (TA = 25°C) and defines the maximum voltage seen by downstream components during surge events - a critical parameter for ensuring compatibility with ICs rated for ≤16 V absolute maximum input.
Is the 1SMA8.0AT3G suitable for automotive applications?
The 1SMA8.0AT3G itself is not AEC-Q101 qualified, but its pin-compatible and electrically identical counterpart SZ1SMA8.0AT3G is fully qualified for automotive use. Engineers designing for automotive environments should select SZ1SMA8.0AT3G to meet OEM requirements for PPAP documentation and process control; the 1SMA8.0AT3G remains appropriate for industrial and commercial applications where qualification is not mandated.
How does the junction capacitance of the 1SMA8.0AT3G affect high-speed signal lines?
The 1SMA8.0AT3G exhibits 1035 pF junction capacitance at 0 V bias and 1 MHz, which may load high-speed data lines (e.g., USB, CAN FD) and cause signal distortion or attenuation. For such applications, lower-capacitance TVS devices like the NUP4105MR6T1G (12 pF) are preferred; the 1SMA8.0AT3G is best applied to DC power rails or low-frequency control signals where capacitance impact is negligible.
What is the thermal derating behavior of the 1SMA8.0AT3G above 75°C ambient?
The 1SMA8.0AT3G's DC power dissipation derates linearly above 75°C at 20 mW/°C, dropping from 1.5 W at 75°C to zero at 150°C. This derating curve is defined in the Maximum Ratings table and reflects junction-to-lead thermal resistance (RJL = 50 °C/W); for sustained operation, designers must ensure board layout provides adequate copper area to maintain TL ≤ 75°C under worst-case power dissipation conditions.
1SMA8.0AT3G 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1035pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA8.0AT3G FAQ
1.How can I place an order for 1SMA8.0AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA8.0AT3G 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 1SMA8.0AT3G reliable?
The price and inventory of 1SMA8.0AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA8.0AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA8.0AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA8.0AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA8.0AT3G?
1SMA8.0AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA8.0AT3G 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 1SMA8.0AT3G?
For technical support, including 1SMA8.0AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA8.0AT3G requirements.
6.How does Aetrix verify that 1SMA8.0AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA8.0AT3G 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 1SMA8.0AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA8.0AT3G?
All 1SMA8.0AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA8.0AT3G, 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 1SMA8.0AT3G part is unused and in its original packaging.
Return procedure for 1SMA8.0AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA8.0AT3G Tags
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