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onsemi 1SMA6.5AT3G
- Part No.:
- 1SMA6.5AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA6.5AT3G.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,083
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Product details
Overview
1SMA6.5AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping overvoltage transients on DC power rails and signal lines. It features a 6.5 V working peak reverse voltage (VRWM), 7.6 V nominal breakdown voltage (VBR) at 10 mA, 11.2 V clamping voltage (VC) at 35.7 A peak pulse current (IPP), and sub-1 ns response time. It is used in automotive power supply protection and industrial control I/O interfaces.
For engineers reviewing the 1SMA6.5AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, VC vs. protected IC absolute maximum rating, IPP capability under system surge profiles, and SMA package thermal performance in FR-4 layouts.
Technical Context
The 1SMA6.5AT3G operates as a unidirectional avalanche diode, conducting only during positive transients relative to its cathode. Its clamping action begins at VBR = 7.22–7.98 V (min–max @ IT = 10 mA) and limits voltage to ≤11.2 V at IPP = 35.7 A under 10/1000 µs waveform.
It delivers 400 W peak pulse power (1 ms, non-repetitive), with thermal resistance RJA = 250 °C/W on FR-4 board and RJL = 50 °C/W to lead. The device exhibits 1605 pF junction capacitance at 0 V bias and 250 µA max IR at VRWM = 6.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5 V - Maximum continuous reverse voltage before significant leakage; must exceed circuit's DC operating voltage. |
| VBR @ IT=10 mA | 7.6 V (nominal) - Avalanche onset voltage; defines minimum clamping threshold under standardized test conditions. |
| VC @ IPP=35.7 A | 11.2 V - Clamped voltage during 10/1000 µs surge; must stay below protected IC's absolute max input rating. |
| PPK | 400 W - Peak transient energy handling capacity; validated per 10 × 1000 µs waveform per R.E.A. standard. |
| CJ @ 0 V | 1605 pF - Junction capacitance affecting high-frequency signal integrity; relevant for data line protection. |
| IR @ VRWM | 250 µA - Reverse leakage at rated working voltage; impacts low-power standby current budgets. |
| Response Time | < 1 ns - Time from transient onset to conduction; ensures protection of fast-edge digital and analog circuits. |
Pinout & Package
The 1SMA6.5AT3G is housed in an SMA (DO-214AC) surface-mount package (Case 403D), featuring a low-profile, flat-handling design suitable for top-side or bottom-side PCB mounting. Polarity is marked by a molded cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal Zener junction | Connected to higher-potential node (e.g., VIN or signal line); conducts when transient exceeds VRWM. |
| Anode | Cathode of internal Zener junction | Connected to reference (e.g., GND or return path); completes clamping current path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating in compact layout. |
| ESD rating >16 kV HBM | Eliminates need for upstream ESD diodes in human-contact interfaces like automotive buttons or industrial HMI ports. |
| SMA package (Case 403D) | Standardized footprint compatible with automated placement; thermal pad not required but improves power dissipation. |
| Low zener impedance | Ensures stable clamping across temperature and current range-critical for protecting precision analog sensors. |
| Pb-free, RoHS-compliant | Meets global environmental compliance requirements without sacrificing surge performance or reliability. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V/100 ms). IC Role / Device Role: Primary clamping element placed between power rail and ground, shunting surge current away from downstream regulators and microcontrollers. Use Value: Limits rail voltage to ≤11.2 V during 35.7 A transients, preventing latch-up or permanent damage to 16 V-rated LDOs and CAN transceivers. |
Use Scenario: 24 V DC digital inputs on programmable logic controllers receiving field wiring with inductive kickback. IC Role / Device Role: Front-end transient suppressor on each isolated input channel, mounted adjacent to connector. Use Value: Absorbs 400 W surges while maintaining <250 µA leakage at 24 V, preserving input threshold accuracy and reducing false triggering. |
| Medical Equipment Power Supply Input | Telecom Line Card Surge Protection |
Use Scenario: AC/DC adapter secondary-side output (12–24 V) feeding sensitive analog front-ends in diagnostic imaging subsystems. IC Role / Device Role: Secondary-side TVS parallel to bulk capacitor, suppressing switching noise and external coupling transients. Use Value: 1605 pF capacitance avoids resonance with typical 100 µF output caps; sub-1 ns response prevents nanosecond glitches from propagating to ADC references. |
Use Scenario: Ethernet or RS-485 interface cards in base station equipment subjected to lightning-induced surges on long cable runs. IC Role / Device Role: First-stage protection on power and signal pairs, coordinated with gas discharge tubes and series impedance. Use Value: Fast clamping at 11.2 V enables precise coordination with secondary protection, minimizing let-through energy to PHY ICs rated for 13.2 V abs max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA6.5AT3G | AEC-Q101 qualified; identical electrical specs; automotive-grade traceability and PPAP support. | Required for automotive OEM designs; same footprint and soldering profile as 1SMA6.5AT3G. | Select SZ1SMA6.5AT3G when automotive qualification, change control, or site-specific manufacturing is mandated. |
| 1.5SMC6.8A | Higher VRWM (6.8 V), higher VC (10.5 V @ 39.2 A), SMC package (larger, higher thermal mass). | Better suited for high-current, high-temperature environments where 1.5 W steady-state dissipation is needed. | Choose 1.5SMC6.8A when board space allows larger SMC and thermal management requires >1.5 W DC power handling. |
Compared with 1SMA6.5AT3G, SZ1SMA6.5AT3G adds automotive qualification without altering electrical behavior, while 1.5SMC6.8A trades compactness for higher thermal capacity and slightly tighter clamping-making it preferable in high-power industrial drives but less optimal for space-constrained automotive modules.
Availability
1SMA6.5AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and medical power supplies requiring stable component supply and full traceability through production lifecycles.
Supply support for 1SMA6.5AT3G 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 cloud power applications.
The 1SMA6.5AT3G belongs to ON Semiconductor's SMA-series TVS family, engineered for cost-effective, high-reliability overvoltage protection in space-constrained, high-surge environments such as automotive body electronics and factory automation I/O modules.
FAQ
What is the maximum working voltage the 1SMA6.5AT3G can protect?
The 1SMA6.5AT3G has a working peak reverse voltage (VRWM) of 6.5 V, meaning it is rated to continuously block up to 6.5 V in reverse bias without significant leakage. It should be selected for circuits where the normal operating voltage does not exceed this value-such as 5 V logic rails or low-voltage sensor interfaces. Exceeding VRWM risks premature conduction and increased power loss.
How does the 1SMA6.5AT3G compare to bidirectional TVS diodes?
The 1SMA6.5AT3G is unidirectional and protects only against positive transients relative to its cathode. Unlike bidirectional variants (e.g., 1SMA6.5CAT3G), it cannot clamp negative-going surges. This makes it ideal for DC power lines or single-polarity signal paths where polarity is fixed and reverse surges are absent or handled separately.
What is the clamping voltage of the 1SMA6.5AT3G under surge conditions?
The 1SMA6.5AT3G clamps to a maximum of 11.2 V when subjected to its rated peak pulse current of 35.7 A under the standard 10/1000 µs waveform. This value is measured at TJ = 25°C and defines the upper voltage limit imposed on the protected circuit during transient events.
Can the 1SMA6.5AT3G be used in automotive applications?
Yes-the 1SMA6.5AT3G meets industrial temperature range (−65°C to +150°C) and is widely used in automotive subsystems. For full AEC-Q101 compliance and PPAP documentation, the pin-compatible SZ1SMA6.5AT3G variant is recommended, sharing identical electrical specs and SMA package dimensions.
What PCB layout considerations apply to the 1SMA6.5AT3G?
For optimal surge performance, route the 1SMA6.5AT3G with minimal trace length between cathode and protected node, and anode to ground plane. Use the ON Semiconductor-recommended footprint for Case 403D (SMA), avoid thermal reliefs on anode pad, and ensure ≥1.5 mm clearance to adjacent high-voltage traces to prevent arcing during clamping.
1SMA6.5AT3G 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):
- 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
1SMA6.5AT3G FAQ
1.How can I place an order for 1SMA6.5AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA6.5AT3G 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 1SMA6.5AT3G reliable?
The price and inventory of 1SMA6.5AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA6.5AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA6.5AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA6.5AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA6.5AT3G?
1SMA6.5AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA6.5AT3G 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 1SMA6.5AT3G?
For technical support, including 1SMA6.5AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA6.5AT3G requirements.
6.How does Aetrix verify that 1SMA6.5AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA6.5AT3G 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 1SMA6.5AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA6.5AT3G?
All 1SMA6.5AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA6.5AT3G, 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 1SMA6.5AT3G part is unused and in its original packaging.
Return procedure for 1SMA6.5AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA6.5AT3G Tags
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