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onsemi 1SMA6.5AT3
- Part No.:
- 1SMA6.5AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA6.5AT3.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,297
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Product details
Overview
1SMA6.5AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) in SMA package, with 6.5 V working peak reverse voltage (VRWM), 7.6 V nominal breakdown voltage (VBR) at 10 mA test current, and 11.2 V clamping voltage (VC) at 35.7 A peak pulse current. It protects sensitive electronics in power supply input stages against ESD and surge events.
For engineers reviewing the 1SMA6.5AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC < IC absolute maximum rating, low zener impedance, sub-1 ns response time, and compatibility with FR-4 PCB mounting using ON Semiconductor's recommended 403D footprint.
Technical Context
The 1SMA6.5AT3 operates as a unidirectional avalanche diode, conducting only during reverse overvoltage transients while remaining high-impedance under normal bias. Its clamping action begins at VRWM = 6.5 V and fully engages at VBR = 7.6 V (min) to 7.98 V (max) with IT = 10 mA.
It delivers 400 W peak pulse power for 1 ms (10/1000 µs waveform), achieves <1 ns response time, and sustains 250 W DC power dissipation at TL = 75°C with thermal resistance RJL = 20 °C/W. ESD rating exceeds 16 kV per Human Body Model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5 V - Maximum continuous reverse voltage before clamping begins; must be ≥ circuit's peak operating voltage. |
| VBR @ IT=10 mA | 7.22–7.98 V - Breakdown onset range; defines minimum overvoltage threshold for reliable transient conduction. |
| VC @ IPP=35.7 A | 11.2 V - Clamped voltage during 400 W surge; determines maximum stress imposed on downstream components. |
| Peak Pulse Power | 400 W @ 1 ms - Surge energy handling capacity per non-repetitive 10/1000 µs waveform per R.E.A. standard. |
| Response Time | <1 ns - Enables suppression of fast-rising ESD and lightning-induced transients before damage occurs. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 Level 4 for system-level ESD immunity design. |
| Thermal Resistance RJL | 20 °C/W - Junction-to-lead thermal path enables 1.5 W DC dissipation at 75°C lead temperature with proper copper pad. |
Pinout & Package
SMA package (Case 403D-02), surface-mount, unidirectional polarity indicated by molded cathode band. Low-profile plastic housing with flat handling surface for accurate pick-and-place placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to system ground or low-side return; forms current path during reverse transient clamp. |
| Cathode | Transient sensing and clamping node | Connected to protected line (e.g., VIN); conducts when reverse voltage exceeds VRWM to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic™ package reliability | Void-free transfer-molded plastic with corrosion-resistant finish and solderable leads per J-STD-020. |
| Clamping performance | Low zener impedance ensures stable VC across 35.7 A surge, minimizing voltage overshoot on protected nodes. |
| Mounting flexibility | Flat bottom surface supports top-slide or bottom-board mounting; compatible with standard reflow profiles (260°C/10 s). |
| Pb-free option | 1SMA6.5AT3G variant available with RoHS-compliant termination and JEDEC-standard Pb-free solderability. |
Applications
| Power Supply Input Protection | Automotive ECUs |
|---|---|
Use Scenario: 12 V automotive power rail exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and DC-DC converter input. Use Value: Clamps transients up to 400 W without degradation, maintaining VIN below 11.2 V to prevent regulator latch-up. |
Use Scenario: CAN transceiver power line in engine control unit subjected to ESD and alternator noise. IC Role / Device Role / Timing Role: Primary overvoltage protection device on VCC rail upstream of LDO. Use Value: Sub-1 ns response isolates fast spikes before they couple into analog sensor interfaces or microcontroller I/O. |
| Industrial PLC I/O Modules | Medical Equipment Power Entry |
Use Scenario: 24 V DC field wiring interface subject to induced surges from relay switching and motor drives. IC Role / Device Role / Timing Role: First-line transient suppressor on terminal block input before filtering and regulation. Use Value: 400 W peak power rating handles repetitive 10/1000 µs surges per IEC 61000-4-5 Level 3 without derating. |
Use Scenario: AC/DC adapter secondary-side output feeding patient-connected monitoring circuits. IC Role / Device Role / Timing Role: Secondary-side overvoltage limiter ensuring safe voltage delivery to isolated analog front-end. Use Value: 16 kV HBM ESD rating meets IEC 60601-1-2 requirements for applied part immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.0A | Higher VRWM (6.0 V vs. 6.5 V), same 400 W rating, SMB package (larger footprint, higher thermal mass) | Preferred where board space allows larger package and tighter VRWM margin is acceptable | Select SMBJ6.0A if thermal cycling robustness is prioritized over minimal PCB area. |
| 1.5SMC6.8A | Same VRWM (6.8 V), higher peak power (1500 W), SMC package (3.5×3.5 mm vs. SMA 4.57×2.92 mm) | Suitable for high-energy industrial surge environments requiring >400 W headroom | Choose 1.5SMC6.8A when protecting against severe lightning-induced surges per IEC 61000-4-5 Level 4. |
Compared with SMBJ6.0A and 1.5SMC6.8A, the 1SMA6.5AT3 offers optimal balance of compact SMA footprint, precise 6.5 V VRWM alignment with 12 V system rails, and sufficient 400 W surge capability for consumer and mid-tier industrial designs-without over-engineering size or cost.
Availability
1SMA6.5AT3 is available at Aetrix Electronics and suitable for power supply input protection, automotive ECU design, industrial PLC I/O modules, medical equipment power entry, and communication system surge hardening requiring stable component supply and consistent parametric performance.
Supply support for 1SMA6.5AT3 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, sensors, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMA6.5AT3 belongs to the SMA-series unidirectional TVS family, engineered specifically for cost-sensitive, space-constrained applications requiring fast, reliable transient suppression in 400 W surge environments.
FAQ
What is the maximum clamping voltage of the 1SMA6.5AT3 under surge conditions?
The 1SMA6.5AT3 exhibits a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current of 35.7 A (400 W, 1 ms, 10/1000 µs waveform). This value is measured per Figure 2 in the official datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Does the 1SMA6.5AT3 meet RoHS and lead-free requirements?
Yes-the 1SMA6.5AT3G variant is explicitly designated as Pb-free and complies with RoHS Directive 2011/65/EU. The standard 1SMA6.5AT3 uses leaded terminations; both variants share identical electrical specifications and mechanical dimensions per Case 403D-02 outline.
Can the 1SMA6.5AT3 be used in bidirectional signal line protection?
No-the 1SMA6.5AT3 is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional protection (e.g., RS-485, USB D+/D−), ON Semiconductor specifies separate devices such as 1SMA10CAT3 through 1SMA78CAT3, which are explicitly labeled as bidirectional in the datasheet.
What is the recommended PCB footprint for the 1SMA6.5AT3?
ON Semiconductor specifies a minimum recommended footprint based on Case 403D-02 dimensions: 4.83 mm × 2.29 mm pad length, 1.27 mm pad width, with 2.54 mm center-to-center spacing. Thermal relief via copper pour on the cathode pad improves heat dissipation during sustained surge events.
How does the 1SMA6.5AT3 compare to the 1SMA6.0AT3 in terms of voltage tolerance?
The 1SMA6.5AT3 has a higher working peak reverse voltage (VRWM = 6.5 V) than the 1SMA6.0AT3 (VRWM = 6.0 V), resulting in tighter margin above typical 5.0–5.5 V logic supply rails but better compatibility with 6.0–6.5 V intermediate bus voltages. Its VBR range (7.22–7.98 V) also starts ~0.5 V higher than the 1SMA6.0AT3's 6.67–7.37 V range.
1SMA6.5AT3 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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1605pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA6.5AT3 FAQ
1.How can I place an order for 1SMA6.5AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA6.5AT3 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 1SMA6.5AT3 reliable?
The price and inventory of 1SMA6.5AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA6.5AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA6.5AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA6.5AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA6.5AT3?
1SMA6.5AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA6.5AT3 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 1SMA6.5AT3?
For technical support, including 1SMA6.5AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA6.5AT3 requirements.
6.How does Aetrix verify that 1SMA6.5AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA6.5AT3 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 1SMA6.5AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA6.5AT3?
All 1SMA6.5AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA6.5AT3, 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 1SMA6.5AT3 part is unused and in its original packaging.
Return procedure for 1SMA6.5AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA6.5AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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