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onsemi 1SMC6.5AT3
- Part No.:
- 1SMC6.5AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC6.5AT3.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,036
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Product details
Overview
1SMC6.5AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and switching transients. It features a 6.5 V working peak reverse voltage (VRWM), 7.22 V nominal breakdown voltage (VBR) at 10 mA test current, 11.2 V maximum clamping voltage (VC) at 133.9 A peak pulse current, and sub-1 ns response time - deployed in automotive power supplies and industrial I/O interfaces.
For engineers reviewing the 1SMC6.5AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping ratio (VC/VRWM = 1.72), low zener impedance, UL 497B recognition for isolated loop protection, and SMC package thermal performance under repetitive surge conditions.
Technical Context
The 1SMC6.5AT3 operates as a unidirectional Zener-based TVS diode with avalanche breakdown mechanism, triggered when reverse voltage exceeds its specified VBR range (7.22–7.98 V). Its clamping action limits transient energy by diverting surge current to ground while maintaining VC ≤ 11.2 V at IPP = 133.9 A (10/1000 µs waveform).
Thermal design relies on junction-to-lead resistance (RJL = 54.6 °C/W) and derating above 75°C; electrical robustness includes 16 kV HBM ESD rating and < 500 nA leakage at VRWM. It is not bidirectional and lacks integrated steering or filtering functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR @ IT=10 mA | 7.22 V (min) to 7.98 V (max) - Ensures reliable turn-on within defined tolerance band under standardized test conditions. |
| VC @ IPP=133.9 A | 11.2 V - Maximum voltage seen by protected circuit during worst-case 10/1000 µs surge; defines clamping headroom. |
| PPK | 1500 W - Peak transient power dissipation capability for non-repetitive 1 ms pulses; determines surge survivability. |
| IR @ VRWM | 500 nA - Reverse leakage current at rated VRWM; negligible loading on upstream bias networks. |
| Response Time | < 1 ns - Enables suppression of fast-rising transients before downstream ICs experience overstress. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop telecom and industrial signal protection applications. |
Pinout & Package
Package: SMC (Case 403), surface-mount, Pb-free, cathode indicated by molded notch. Dimensions: 5.59–6.10 mm (D) × 6.60–7.11 mm (E) × 1.90–2.41 mm (A), with modified L-bend leads for enhanced pad adhesion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; tied to system ground or low-side reference in unidirectional clamp configuration. | Provides return path for surge current; must be routed with minimal inductance to preserve clamping speed. |
| Cathode | Transient voltage sensing node; connected to protected line (e.g., CAN_H, RS-485 A, 12 V rail). | Defines clamping threshold relative to anode potential; polarity marking ensures correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports high-energy surge immunity per IEC 61000-4-5 Level 4 (4 kV/2 Ω) without degradation. |
| Clamping ratio VC/VRWM = 1.72 | Delivers tight voltage limiting margin - critical for protecting 5 V or 3.3 V logic rails downstream of 6.5 V supply domains. |
| UL 497B certified | Validated for safety-critical isolated loop protection in telecom and process control systems requiring regulatory compliance. |
| ESD rating >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) for board-level ESD hardening. |
| Low zener impedance & fast response | Minimizes voltage overshoot during nanosecond-scale transients; reduces need for additional RC filtering. |
Applications
| Automotive Power Supply Protection | Industrial RS-485 Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp transients before they reach PMICs or microcontrollers. Use Value: Withstands 1500 W surges and maintains VC ≤ 11.2 V, preventing latch-up or gate oxide damage in downstream 5 V logic. |
Use Scenario: RS-485 transceivers in factory automation networks subjected to cable ESD and ground loop surges. IC Role / Device Role / Timing Role: Paired TVS devices (one per line) referenced to local ground, suppressing common-mode transients on A/B differential pairs. Use Value: Sub-1 ns response ensures clamping occurs before transceiver input stages saturate, preserving data integrity during 8 kV contact discharge. |
| Medical Equipment Signal Line Protection | Point-of-Sale Terminal Power Input Protection |
|
Use Scenario: Analog sensor inputs (e.g., temperature, pressure) in UL-certified diagnostic devices connected to long harnesses. IC Role / Device Role / Timing Role: Low-leakage (500 nA) TVS on signal lines referenced to analog ground, guarding ADC front-ends. Use Value: UL 497B recognition validates safe use in patient-connected equipment; VRWM = 6.5 V avoids interference with 5 V sensor excitation. |
Use Scenario: 12 V DC input stage of retail POS terminals powered via wall adapters in electrically noisy retail environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input filter and DC-DC converter, absorbing induced surges from shared AC circuits. Use Value: 133.9 A IPP rating handles high-current transients from nearby motor startups; SMC package supports automated reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.5A | Same VRWM (6.5 V) and VBR range, but lower PPK = 600 W and IPP = 62.2 A; SMB package (smaller footprint, higher RJA). | Lower surge capacity suits consumer-grade peripherals; insufficient for ISO 7637-2 Pulse 5a automotive testing. | Select when space-constrained layouts prioritize footprint over surge margin, and peak currents remain below 60 A. |
| 1.5SMC6.5A | Identical electrical specs and SMC package, but obsolete ON Semiconductor part; no active UL 497B listing in current documentation. | Lacks UL certification required for medical or telecom infrastructure deployments. | Prefer 1SMC6.5AT3 where regulatory compliance (UL 497B) or long-term supply continuity is mandatory. |
Compared with SMBJ6.5A and 1.5SMC6.5A, the 1SMC6.5AT3 delivers superior surge handling (1500 W vs. 600 W), certified isolation-loop safety (UL 497B), and active production status - making it the preferred choice for automotive, industrial, and regulated medical designs requiring validated reliability.
Availability
1SMC6.5AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial RS-485 nodes, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for 1SMC6.5AT3 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 is a global semiconductor supplier specializing in power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMC6.5AT3 belongs to the SMC-series Zener TVS family, engineered specifically for high-energy transient suppression in harsh environments - emphasizing robustness, regulatory compliance, and manufacturability in surface-mount production.
FAQ
What is the clamping voltage of the 1SMC6.5AT3 at its rated peak pulse current?
The 1SMC6.5AT3 has a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current (IPP) of 133.9 A under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on the protected circuit during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The 1SMC6.5AT3 achieves this with low dynamic impedance and sub-1 ns response.
Is the 1SMC6.5AT3 RoHS-compliant and lead-free?
Yes, the "G" suffix in 1SMC6.5AT3 indicates a Pb-free (RoHS-compliant) package per ON Semiconductor's specification. The device uses void-free, transfer-molded thermosetting plastic with solderable leads qualified for reflow up to 260°C for 10 seconds. Full compliance documentation, including material declarations and test reports, is available through ON Semiconductor's official product page and Aetrix Electronics' traceable sourcing records for the 1SMC6.5AT3.
Can the 1SMC6.5AT3 be used in bidirectional protection circuits?
No, the 1SMC6.5AT3 is explicitly a unidirectional TVS diode and is not rated or characterized for bidirectional operation. The datasheet confirms bidirectional devices are unavailable in the SMC series. For AC or differential-line protection requiring symmetrical clamping, a dedicated bidirectional TVS such as SMBJ6.5CA or SMCJ6.5CA must be selected - the 1SMC6.5AT3 will conduct heavily in reverse bias beyond VRWM and cannot suppress positive-going transients on its anode side.
What is the maximum allowable reverse leakage current for the 1SMC6.5AT3 at its working voltage?
The 1SMC6.5AT3 specifies a maximum reverse leakage current (IR) of 500 nA at its working peak reverse voltage (VRWM) of 6.5 V and TA = 25°C. This ultra-low leakage ensures minimal power loss and signal distortion in high-impedance monitoring or precision analog paths. Leakage remains well below 1 µA across its full operating temperature range (−65°C to +150°C), supporting reliable performance in battery-powered and medical-grade 1SMC6.5AT3 deployments.
Does the 1SMC6.5AT3 require external heat sinking in typical PCB layouts?
No, the 1SMC6.5AT3 is designed for self-sufficient thermal performance in standard FR-4 PCB layouts using ON Semiconductor's recommended minimum footprint (Case 403 outline). Its junction-to-lead thermal resistance (RJL = 54.6 °C/W) enables effective heat transfer to copper planes without added heatsinks. However, sustained repetitive surges or ambient temperatures above 75°C require derating per Figure 3 in the datasheet - proper layout with thermal vias and copper pour improves margin, but discrete heat sinking is unnecessary for single-event 1500 W transients.
1SMC6.5AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- 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):
- 133.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
1SMC6.5AT3 FAQ
1.How can I place an order for 1SMC6.5AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC6.5AT3 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 1SMC6.5AT3 reliable?
The price and inventory of 1SMC6.5AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC6.5AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC6.5AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC6.5AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC6.5AT3?
1SMC6.5AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC6.5AT3 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 1SMC6.5AT3?
For technical support, including 1SMC6.5AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC6.5AT3 requirements.
6.How does Aetrix verify that 1SMC6.5AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC6.5AT3 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 1SMC6.5AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC6.5AT3?
All 1SMC6.5AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC6.5AT3, 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 1SMC6.5AT3 part is unused and in its original packaging.
Return procedure for 1SMC6.5AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC6.5AT3 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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Diodes Incorporated
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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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