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onsemi 1SMA7.0AT3G
- Part No.:
- 1SMA7.0AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA7.0AT3G.pdf
- Description:
- TVS DIODE 7VWM 12VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,856
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Product details
Overview
1SMA7.0AT3G 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 7.0 V working peak reverse voltage (VRWM), 8.19 V nominal breakdown voltage (VBR) at 10 mA test current, 12.0 V clamping voltage (VC) at 33.3 A peak pulse current, and sub-1 ns response time. It is used in automotive power supply protection and industrial control I/O interfaces.
For engineers reviewing the 1SMA7.0AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, and SMA package thermal performance on FR-4 PCBs.
Technical Context
The 1SMA7.0AT3G operates as a unidirectional avalanche diode, conducting only during negative transients relative to its anode–cathode polarity. Its clamping action begins at VRWM = 7.0 V and fully engages at VBR = 8.19 V (min) with IT = 10 mA, limiting voltage to VC = 12.0 V at IPP = 33.3 A under standardized 10/1000 µs surge conditions.
It exhibits low zener impedance and fast response (<1 ns), enabling effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges. Thermal design relies on junction-to-lead resistance (RJL = 20 °C/W) and derating above 75°C, with 1.5 W DC power dissipation at TL = 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 400 W @ 1 ms, 10/1000 µs waveform - supports single-event surge immunity per IEC 61000-4-5 Level 4 |
| Working Peak Reverse Voltage (VRWM) | 7.0 V - sets minimum standoff voltage; must exceed normal circuit operating voltage |
| Breakdown Voltage (VBR) | 8.19 V (nominal) @ IT = 10 mA - defines onset of avalanche conduction |
| Clamping Voltage (VC) | 12.0 V @ IPP = 33.3 A - maximum voltage seen by protected circuit during surge |
| Response Time | <1 ns - ensures clamping before transient energy damages downstream ICs |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 for system-level ESD robustness |
| Thermal Resistance (Junction-to-Lead) | 20 °C/W - enables 1.5 W continuous dissipation at 75°C lead temperature |
Pinout & Package
1SMA7.0AT3G uses the SMA (DO-214AC) surface-mount plastic package (Case 403D-02), measuring 4.06–4.57 mm × 2.29–2.92 mm × 1.91–2.41 mm (L×W×H). Cathode is marked by a molded band; polarity must be observed during PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or surge clamping | Connected to lower-potential side (e.g., GND or return path); determines unidirectional clamping direction |
| Cathode | Current exit terminal; marked by polarity band | Connected to protected line (e.g., 5 V rail); conducts avalanche current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Protects DC rails without interfering with normal forward-biased operation; avoids leakage issues in bidirectional signal paths |
| Low-profile Surmetic™ package | Enables high-density placement on compact PCBs while maintaining thermal reliability via copper-pad mounting |
| Flat handling surface | Ensures consistent pick-and-place accuracy during automated assembly, reducing tombstoning risk |
| Pb-free (RoHS-compliant) construction | Meets global environmental regulations without compromising surge performance or solderability |
| High surge current capability | Withstands 33.3 A peak pulse current - sufficient for automotive load-dump and industrial surge immunity testing |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 5 V or 12 V microcontroller power inputs against load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VCC and GND, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤12.0 V, preventing latch-up or permanent damage to MCUs rated for 13.2 V absolute max. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff device across input terminals, absorbing energy from inductive kickback and ESD events. Use Value: Maintains signal integrity by clamping transients within 1 ns, avoiding false triggering of optocouplers or Schmitt triggers. |
| Medical Equipment Power Supply Input | Point-of-Sale Terminal USB Port Protection |
Use Scenario: Safeguarding isolated DC-DC converter inputs in diagnostic imaging devices exposed to hospital-grade power fluctuations. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 5 V/3.3 V distribution network. Use Value: Delivers 400 W peak power handling with <1 ns response, meeting IEC 60601-1 creepage and surge requirements. |
Use Scenario: Adding robust ESD protection to USB VBUS and D+/D− lines in retail kiosks subject to frequent human contact. IC Role / Device Role / Timing Role: Low-capacitance TVS array element (used per-line) suppressing HBM and CDM discharges. Use Value: Provides >16 kV HBM ESD rating without degrading USB 2.0 signal rise time due to minimal junction capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.0A | 600 W peak power, same VRWM (7.0 V), higher IPP (64.5 A), larger SMB package (DO-214AA) | Better suited for higher-energy surges; requires larger PCB footprint and higher thermal mass | Select when 400 W is insufficient and board space allows SMB footprint |
| 1.5SMC7.0A | 1500 W peak power, same VRWM, higher VC (12.6 V), DO-214AB package with higher thermal mass | Designed for heavy industrial environments with repeated surge exposure; not optimized for space-constrained designs | Choose for mission-critical infrastructure where long-term surge endurance outweighs size constraints |
Compared with SMBJ7.0A and 1.5SMC7.0A, the 1SMA7.0AT3G offers optimal balance of surge robustness, compact SMA footprint, and cost efficiency for consumer and mid-tier industrial applications-without requiring PCB redesign or sacrificing HBM ESD immunity.
Availability
1SMA7.0AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, medical power supplies, and point-of-sale terminals requiring stable component supply and RoHS-compliant transient protection.
Supply support for 1SMA7.0AT3G 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMA7.0AT3G belongs to the 1SMAxxAT3 series of unidirectional TVS diodes engineered specifically for high-reliability DC rail protection in space-constrained, thermally demanding environments.
FAQ
What is the maximum clamping voltage of the 1SMA7.0AT3G under surge conditions?
The 1SMA7.0AT3G has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current of 33.3 A under the standard 10/1000 µs waveform. This value is measured at the device terminals and represents the highest voltage imposed on the protected circuit during a full-power transient event. Designers must ensure downstream components tolerate this 12.0 V clamped level.
Is the 1SMA7.0AT3G compatible with lead-free reflow soldering processes?
Yes, the 1SMA7.0AT3G is Pb-free and qualified for lead-free reflow soldering per J-STD-020. Its maximum soldering temperature is 260°C for 10 seconds, matching standard Pb-free profile requirements. The device's Surmetic™ package maintains mechanical integrity and electrical performance after exposure to peak reflow temperatures.
How does the 1SMA7.0AT3G differ from bidirectional TVS diodes like the 1SMA7.0CAT3?
The 1SMA7.0AT3G is unidirectional and protects only against positive-going transients on the cathode side, while the 1SMA7.0CAT3 is bidirectional and clamps both polarities. The 1SMA7.0AT3G has lower leakage current and is preferred for DC power rail protection; the CAT3 variant suits AC signal lines or differential buses where polarity reversal occurs.
Can the 1SMA7.0AT3G be used in parallel to increase surge current handling?
No-parallel connection of 1SMA7.0AT3G devices is not recommended due to parameter variation (e.g., VBR tolerance ±5%) causing current imbalance and premature failure of one unit. For higher surge capacity, select a single higher-rated device such as SMBJ7.0A instead of paralleling multiple 1SMA7.0AT3G units.
What is the junction-to-ambient thermal resistance (RJA) of the 1SMA7.0AT3G on a standard FR-4 board?
The 1SMA7.0AT3G has a junction-to-ambient thermal resistance (RJA) of 250 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint (Case 403B outline). This value assumes no additional copper pour; adding thermal pads or vias reduces RJA significantly and improves DC power handling beyond the rated 0.5 W at 25°C.
1SMA7.0AT3G 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1505pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA7.0AT3G FAQ
1.How can I place an order for 1SMA7.0AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA7.0AT3G 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 1SMA7.0AT3G reliable?
The price and inventory of 1SMA7.0AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA7.0AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA7.0AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA7.0AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA7.0AT3G?
1SMA7.0AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA7.0AT3G 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 1SMA7.0AT3G?
For technical support, including 1SMA7.0AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA7.0AT3G requirements.
6.How does Aetrix verify that 1SMA7.0AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA7.0AT3G 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 1SMA7.0AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA7.0AT3G?
All 1SMA7.0AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA7.0AT3G, 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 1SMA7.0AT3G part is unused and in its original packaging.
Return procedure for 1SMA7.0AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA7.0AT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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