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onsemi 1SMA7.0AT3
- Part No.:
- 1SMA7.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMA7.0AT3.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:3,749
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Product details
Overview
1SMA7.0AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) in SMA package, with 7.0 V working peak reverse voltage (VRWM), 8.19 V nominal breakdown voltage (VBR) at 10 mA test current, and 12.0 V clamping voltage (VC) at 33.3 A peak pulse current - designed to protect DC power rails and I/O lines in automotive ECUs and industrial power supplies.
For engineers reviewing the 1SMA7.0AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < IC absolute maximum rating, sub-1 ns response time, and AEC-Q101 qualification for harsh-environment reliability.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping overvoltage protection device, triggered when reverse voltage exceeds its specified VBR range (7.78–8.6 V). It conducts surge current away from sensitive downstream circuitry while maintaining clamping voltage ≤12.0 V at 33.3 A IPP.
Its low zener impedance, fast <1 ns response time, and 400 W 10/1000 µs surge capability enable robust protection against ESD (Class 3 >16 kV HBM), lightning-induced transients, and inductive switching spikes in 12 V automotive and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.0 V - Maximum continuous reverse voltage before clamping; matches nominal 12 V rail derated for ripple and tolerance. |
| VBR @ IT=10 mA | 8.19 V (nominal) - Ensures reliable turn-on above normal operating voltage but below downstream IC absolute max ratings. |
| VC @ IPP=33.3 A | 12.0 V - Clamped voltage during 400 W transient; must be below protected IC's VDD absolute maximum (e.g., 13.2 V). |
| IPP | 33.3 A - Peak pulse current supported under 10/1000 µs waveform; defines minimum trace width and PCB layout margin. |
| CJ @ 0 V, 1 MHz | 1505 pF - Junction capacitance impacts high-speed signal integrity; suitable for DC/low-frequency power rails, not USB or CAN lines. |
| Package | SMA (Case 403D-02) - Surface-mount, low-profile, AEC-Q101 qualified; requires standard reflow profile with 260 °C max soldering temperature. |
Pinout & Package
SMA package (Case 403D-02), surface-mount, unidirectional polarity indicated by cathode band. Dimensions: 4.06 × 2.0 × 1.14 mm (L × W × H), with flat handling surface for accurate placement and top/bottom board mounting flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection to protected line | Connected to supply rail or signal line; absorbs positive transients when referenced to ground. |
| Anode | Ground reference node | Must connect directly to low-inductance ground plane to minimize clamping voltage overshoot during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and body electronics. |
| 400 W peak power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-5 Level 3 surges without degradation. |
| ESD Class 3 (>16 kV HBM) | Protects against human-body model discharges common in assembly, testing, and field service environments. |
| Response time <1 ns | Clamps transients before they propagate into IC input stages, preserving signal integrity in fast-switching systems. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24 V DC Power Supply |
|---|---|
Use Scenario: Protects microcontroller I/O pins and sensor inputs from load-dump transients and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between LIN bus line and chassis ground. Use Value: Limits voltage to ≤12.0 V during 33.3 A surges, preventing latch-up or gate oxide damage in 5 V/3.3 V logic interfaces. | Use Scenario: Shields PLC analog input modules from induced surges on 24 V field wiring exposed to motor drives and relay coils. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input rail upstream of DC-DC converter. Use Value: Absorbs 400 W energy per event without failure, enabling compliance with IEC 61000-4-5 Level 4 immunity requirements. |
| Medical Infusion Pump Power Input | Point-of-Sale (POS) Terminal USB Port Protection |
Use Scenario: Safeguards battery-charging circuitry and MCU power rails against ESD and cable discharge events during hospital equipment handling. IC Role / Device Role / Timing Role: Secondary TVS on 5 V USB charging path, coordinated with primary front-end filter. Use Value: Withstands >16 kV HBM ESD strikes while adding only 1505 pF capacitance - no data rate degradation on low-speed USB 2.0 lines. | Use Scenario: Prevents damage to USB controller ICs from static discharge during peripheral hot-plug in retail environments. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line, grounded to system earth via low-inductance path. Use Value: Clamps 12.0 V within 1 ns, keeping VBUS below 13.2 V absolute max rating of USB PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA7.0AT3G | Identical electrical specs; "SZ" prefix denotes automotive-grade traceability and PPAP support. | Required for Tier-1 automotive programs needing full change control documentation and lot-level traceability. | Select SZ1SMA7.0AT3G when AEC-Q101 PPAP submission and site-specific process controls are mandated. |
| 1SMA7.0A | Same die, but in obsolete DO-214AC (SMA) package without "T3" tape-and-reel packaging and Pb-free compliance. | Not suitable for automated SMT production or RoHS-compliant designs; lacks current manufacturing controls. | Prefer 1SMA7.0AT3 for new designs requiring Pb-free compliance, tape-and-reel delivery, and guaranteed long-term supply. |
Compared with SZ1SMA7.0AT3G, the 1SMA7.0AT3 offers identical protection performance but omits automotive-specific documentation controls; compared with legacy 1SMA7.0A, it adds Pb-free processing, modern packaging, and assured availability - making it optimal for industrial and medical designs where AEC-Q101 traceability is not required.
Availability
1SMA7.0AT3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24 V DC power supplies, and medical infusion pump power inputs requiring stable component supply across multi-year production cycles.
Supply support for 1SMA7.0AT3 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 infrastructure markets.
The 1SMA7.0AT3 belongs to the 1SMAxxAT3 series of unidirectional TVS diodes engineered for high-reliability overvoltage protection in harsh environments - emphasizing surge robustness, fast response, and AEC-Q101 qualification for mission-critical systems.
FAQ
What is the clamping voltage of the 1SMA7.0AT3 under a 400 W transient?
The 1SMA7.0AT3 exhibits a clamping voltage (VC) of 12.0 V at 33.3 A peak pulse current, corresponding to the standardized 10/1000 µs surge waveform. This value is measured per Figure 2 in the datasheet and ensures downstream ICs see no more than 12.0 V during worst-case transients - critical for protecting 13.2 V absolute-maximum-rated components. The 1SMA7.0AT3 maintains this clamping performance across its rated temperature range.
Is the 1SMA7.0AT3 suitable for bidirectional signal line protection?
No, the 1SMA7.0AT3 is a unidirectional TVS diode and must not be used on AC-coupled or bidirectional data lines such as RS-485 or CAN. Its cathode-anode polarity is fixed, and reverse conduction is not characterized. For bidirectional protection, select the 1SMA7.0CAT3 variant or equivalent symmetric TVS devices - the 1SMA7.0AT3 is strictly intended for DC rail or single-polarity I/O protection.
Does the 1SMA7.0AT3 meet automotive qualification standards?
Yes, the 1SMA7.0AT3 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control, body electronics, and infotainment power domains. While the "SZ" prefix variants provide enhanced traceability for Tier-1 programs, the 1SMA7.0AT3 itself meets all stress-test requirements of AEC-Q101 Rev D, including temperature cycling, humidity bias, and mechanical shock.
What is the junction capacitance of the 1SMA7.0AT3 and how does it affect circuit design?
The 1SMA7.0AT3 has a typical junction capacitance (CJ) of 1505 pF at 0 V bias and 1 MHz. This relatively high capacitance makes it unsuitable for high-speed data lines (e.g., USB 2.0, HDMI, or CAN FD), but appropriate for DC power rails, low-frequency analog sensors, and digital I/O with rise times >100 ns. Layout best practice is to minimize trace length between cathode and protected node to avoid resonance effects.
How does the 1SMA7.0AT3 differ from the 1SMA7.0A part number?
The 1SMA7.0AT3 replaces the legacy 1SMA7.0A with Pb-free construction, tape-and-reel packaging (5,000 pcs/reel), and updated manufacturing controls per ON Semiconductor's current quality system. Electrically identical, the 1SMA7.0AT3 guarantees RoHS compliance and long-term availability - whereas 1SMA7.0A is obsolete and no longer supported for new designs. Both share the same SMA package and electrical specs, but only the 1SMA7.0AT3 is actively distributed.
1SMA7.0AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
1SMA7.0AT3 FAQ
1.How can I place an order for 1SMA7.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA7.0AT3 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 1SMA7.0AT3 reliable?
The price and inventory of 1SMA7.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA7.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA7.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA7.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA7.0AT3?
1SMA7.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA7.0AT3 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 1SMA7.0AT3?
For technical support, including 1SMA7.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA7.0AT3 requirements.
6.How does Aetrix verify that 1SMA7.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA7.0AT3 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 1SMA7.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA7.0AT3?
All 1SMA7.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA7.0AT3, 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 1SMA7.0AT3 part is unused and in its original packaging.
Return procedure for 1SMA7.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA7.0AT3 Tags
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onsemi
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