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onsemi 1SMB6.5AT3
- Part No.:
- 1SMB6.5AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB6.5AT3.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,585
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Product details
Overview
1SMB6.5AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, with 6.5 V working peak reverse voltage (VRWM), 7.22 V minimum breakdown voltage (VBR) at 10 mA test current, and 11.2 V clamping voltage (VC) at 53.6 A peak pulse current - designed to protect sensitive DC power rails and I/O lines in automotive and industrial power supplies.
For engineers reviewing the 1SMB6.5AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 1 ms 600 W surge, UL 497B recognition for isolated loop protection, sub-1 ns response time, low leakage (<500 µA @ 6.5 V), and Pb-free SMB package compatibility with automated SMT assembly.
Technical Context
The 1SMB6.5AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its VRWM of 6.5 V. Its 11.2 V clamping voltage at 53.6 A IPP ensures robust overvoltage protection for 5 V–6 V nominal systems without overstressing downstream ICs.
It features a thermally optimized Surmetic SMB package (Case 403A) with modified L-bend leads for enhanced solder joint reliability, 260°C/10 s reflow tolerance, and junction-to-ambient thermal resistance of 226°C/W - enabling sustained operation in ambient temperatures up to +150°C when properly mounted on FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (1 ms) | 600 W - withstands high-energy ESD and lightning-induced surges per IEC 61000-4-5 Level 4 without failure |
| Working Peak Reverse Voltage (VRWM) | 6.5 V - selected to match 5 V logic supply rails while providing margin above nominal operating voltage |
| Breakdown Voltage (VBR) @ IT = 10 mA | 7.22–7.98 V - tight 10% tolerance ensures predictable turn-on during overvoltage events |
| Clamping Voltage (VC) @ IPP = 53.6 A | 11.2 V - limits transient voltage seen by protected circuitry to safe levels below typical 12 V system thresholds |
| Reverse Leakage Current @ VRWM | 500 µA max - negligible standby power loss in battery-powered or low-quiescent-current applications |
| Response Time | <1.0 ns - fast enough to suppress ESD events before damage occurs to CMOS inputs or microcontrollers |
| Junction Capacitance @ 0 V, 1 MHz | 2140 pF - suitable for DC power line and low-speed signal line protection; not recommended for >10 Mbps data lines |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H); lead finish: matte tin, solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms return path for surge current during clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 5 V rail or RS-232 TX); carries full IPP during surge event |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection in telecom and industrial interfaces - eliminates need for separate safety certification |
| ESD Rating (HBM) | Class 3 (>16 kV) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity without external shielding |
| Pb-Free & RoHS Compliant | G-suffix variant uses matte tin lead finish compatible with lead-free reflow profiles and environmental compliance requirements |
| Surmetic® Package Reliability | Void-free transfer-molded construction with corrosion-resistant finish ensures >1000 thermal cycles and long-term moisture resistance |
| Thermal Derating Support | Specified derating curves (Figure 3) enable accurate lifetime prediction in high-temperature environments up to +150°C |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 5 V microcontroller power pins against load dump and alternator ripple in body control modules. IC Role / Device Role: Unidirectional TVS placed between 5 V rail and chassis ground to shunt surge energy away from MCU VDD pin. Use Value: Clamps transients to ≤11.2 V within <1 ns, preventing latch-up or gate oxide damage in 5 V logic ICs during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24 V digital input terminals of programmable logic controllers against field-wiring induced surges. IC Role / Device Role: TVS connected across input optocoupler anode-cathode to limit voltage during induced transients on long sensor cables. Use Value: Withstands 600 W surges per IEC 61000-4-5 while maintaining <500 µA leakage at 24 V - avoids false triggering of input detection circuitry. |
| Medical Equipment Power Supply Clamp | Point-of-Sale Terminal USB Port Protection |
Use Scenario: Secondary-side overvoltage suppression on isolated 5 V/3.3 V outputs of medical-grade AC-DC adapters. IC Role / Device Role: Standoff TVS on output rail to absorb residual switching spikes and EFT bursts before reaching patient-connected circuits. Use Value: UL 497B recognition confirms suitability for medically isolated barrier protection; 11.2 V VC ensures no overvoltage stress on downstream LDOs or ADC references. |
Use Scenario: DC power line protection on USB VBUS input of retail kiosks exposed to frequent hot-plug and cable discharge events. IC Role / Device Role: Unidirectional TVS between VBUS and GND to clamp ESD and contact discharge surges before USB controller IC. Use Value: 16 kV HBM rating and <1 ns response meet USB-IF ESD robustness requirements; 2140 pF capacitance does not degrade USB 2.0 signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.0A | Lower VRWM (6.0 V), higher IPP (61.5 A), same SMB package | Better suited for tighter 5 V rail margins; slightly lower clamping (10.3 V @ 61.5 A) | Select when design requires lower turn-on threshold and higher surge margin than 1SMB6.5AT3 offers |
| 1.5SMC6.8A | Larger SMC package (7.1 mm × 6.2 mm), same 6.8 V VRWM, 600 W rating | Higher thermal mass supports higher average surge duty cycles; incompatible with SMB footprint | Choose only if board layout allows larger footprint and thermal performance outweighs space constraints |
Compared with SMBJ6.0A and 1.5SMC6.8A, the 1SMB6.5AT3 provides optimal balance of 6.5 V VRWM margin for 5 V systems, SMB-size board space efficiency, and UL 497B certification - making it preferred for compact, safety-certified industrial and automotive modules where footprint and regulatory alignment are critical.
Availability
1SMB6.5AT3 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC input stages, medical device secondary-side regulation, and point-of-sale terminal USB protection requiring stable component supply and full traceability.
Supply support for 1SMB6.5AT3 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMB6.5AT3 belongs to the SMB series of unidirectional TVS diodes engineered specifically for high-reliability transient suppression in harsh environments - emphasizing UL recognition, surge robustness, and manufacturability in high-volume SMT production.
FAQ
What is the maximum clamping voltage of the 1SMB6.5AT3 under standard test conditions?
The 1SMB6.5AT3 has a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current of 53.6 A with a 1 ms exponential waveform. This value is measured per Figure 2 in the datasheet and ensures protected circuits remain below critical voltage thresholds during surge events. The 1SMB6.5AT3 maintains this clamping performance across its specified operating temperature range of −65°C to +150°C.
Is the 1SMB6.5AT3 RoHS compliant and lead-free?
Yes, the "G" suffix in 1SMB6.5AT3 indicates a Pb-free, RoHS-compliant version with matte tin lead finish. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and supports standard lead-free reflow profiles up to 260°C for 10 seconds. The 1SMB6.5AT3 is fully qualified for use in environmentally regulated applications including automotive and medical electronics.
Can the 1SMB6.5AT3 be used for bidirectional transient suppression?
No, the 1SMB6.5AT3 is strictly unidirectional and must be oriented with cathode toward the protected line and anode to ground. For bidirectional protection (e.g., AC lines or differential signals), ON Semiconductor offers the 1SMB6.5CAT3 variant. Using the 1SMB6.5AT3 in reverse-biased configuration will not provide symmetrical clamping and may fail catastrophically under negative transients.
What is the junction-to-ambient thermal resistance (RJA) of the 1SMB6.5AT3?
The 1SMB6.5AT3 has a junction-to-ambient thermal resistance (RJA) of 226°C/W when mounted on an FR-4 PCB using ON Semiconductor's minimum recommended footprint (Case 403A outline). This value assumes natural convection cooling; adding copper pour or thermal vias can reduce effective RJA. Derating begins above +25°C ambient, with full power limited to 0.55 W at +75°C.
Does the 1SMB6.5AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire 1SMB5.0AT3 series - including the 1SMB6.5AT3 - holds UL 497B recognition under File #E210057 for protector classification (QVGQ2). It passed strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - confirming suitability for protecting isolated communication loops in industrial and telecom equipment without additional external certification.
1SMB6.5AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- 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):
- 53.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2140pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB6.5AT3 FAQ
1.How can I place an order for 1SMB6.5AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB6.5AT3 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 1SMB6.5AT3 reliable?
The price and inventory of 1SMB6.5AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB6.5AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB6.5AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB6.5AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB6.5AT3?
1SMB6.5AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB6.5AT3 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 1SMB6.5AT3?
For technical support, including 1SMB6.5AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB6.5AT3 requirements.
6.How does Aetrix verify that 1SMB6.5AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB6.5AT3 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 1SMB6.5AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB6.5AT3?
All 1SMB6.5AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB6.5AT3, 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 1SMB6.5AT3 part is unused and in its original packaging.
Return procedure for 1SMB6.5AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB6.5AT3 Tags
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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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