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onsemi 1SMC9.0AT3
- Part No.:
- 1SMC9.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC9.0AT3.pdf
- Description:
- TVS DIODE 9VWM 15.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,959
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Product details
Overview
1SMC9.0AT3 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 inductive switching transients. It features a 9.0 V working peak reverse voltage (VRWM), 10.55 V nominal breakdown voltage (VBR) at 1 A test current, 15.4 V maximum clamping voltage (VC) at 97.4 A peak pulse current, and sub-1 ns response time - deployed in automotive power supplies, industrial I/O interfaces, and telecom line cards.
For engineers reviewing the 1SMC9.0AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, UL 497B certification status, and real-world design implications of its low zener impedance and <5 µA leakage at VRWM.
Technical Context
The 1SMC9.0AT3 operates as a unidirectional Zener-based TVS diode with avalanche breakdown mechanism, activated only when reverse voltage exceeds VRWM = 9.0 V. Its clamping action begins at VBR = 10.55 V (min 9.92 V, max 11.1 V) and limits transient energy to VC ≤ 15.4 V at IPP = 97.4 A (10/1000 µs waveform), delivering robust protection without forward conduction during normal operation.
Thermal performance is defined by RJA = 165 °C/W (FR-4 board, minimum footprint) and RJL = 18.3 °C/W (zero-lead-length condition), supporting reliable operation from −65 °C to +150 °C. It meets UL 497B Class 3 ESD rating (>16 kV HBM) and is Pb-free per J-STD-609, packaged in ON Semiconductor's Surmetic SMC (Case 403) thermoset plastic housing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0 V - Maximum continuous reverse operating voltage before clamping initiates; must be ≥ circuit DC/peak voltage. |
| VBR @ IT=1 A | 10.55 V (nominal) - Breakdown threshold where device transitions into low-impedance conduction; tight tolerance ±5% ensures predictable activation. |
| VC @ IPP=97.4 A | 15.4 V - Maximum clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected ICs. |
| PPK | 1500 W - Peak pulse power handling capability at TL = 25°C, 1 ms pulse width; enables single-device protection against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | 10 µA - Reverse leakage current at rated working voltage; low value minimizes standby power loss and avoids false triggering. |
| Response Time | <1 ns - Time from transient onset to clamping onset; critical for protecting high-speed logic and microcontrollers from nanosecond-scale ESD events. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates performance in telecom, industrial control, and safety-critical signal lines. |
Pinout & Package
1SMC9.0AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a molded cathode notch for polarity identification and modified L-bend leads optimized for solder joint reliability on FR-4 PCBs. Dimensions: 5.59–6.10 mm (D) × 6.60–7.11 mm (E) × 1.90–2.41 mm (A), with 0.76–1.27 mm lead length (L).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Surge return path | Connected to system ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection / Clamping node | Connected to the line being protected (e.g., CAN_H, RS-485 A/B, power rail); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe transients including IEC 61000-4-5 4 kV/2 Ω combination wave surges. |
| Clamping ratio VC/VBR = 1.46 | Indicates efficient voltage limiting - lower ratio means tighter control over protected circuit overvoltage. |
| ESD rating >16 kV (HBM) | Meets IEC 61000-4-2 Level 4 requirements without external series impedance; suitable for front-end USB, Ethernet, and sensor interfaces. |
| Low thermal resistance (RJL = 18.3 °C/W) | Supports rapid heat dissipation during repetitive surges; extends device lifetime in cyclic industrial environments. |
| Pb-free Surmetic SMC package | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609; qualified for lead-free reflow (260°C/10 s). |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp transients above 9.0 V before they reach PMICs or MCUs. Use Value: Limits peak voltage to ≤15.4 V during 97.4 A surges, preventing latch-up or gate oxide damage in downstream 16 V-rated regulators. |
Use Scenario: RS-485 data lines in factory automation systems subject to ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: One 1SMC9.0AT3 per line (A and B) referenced to local signal ground, absorbing common-mode surges up to 1500 W. Use Value: Sub-1 ns response ensures clamping occurs before transceiver input stages are overstressed; UL 497B certification validates use in safety-isolated loops. |
| Telecom DSL Line Interface | Medical Equipment Signal Input Protection |
Use Scenario: ADSL/VDSL line cards interfacing with outside plant wiring vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Primary protection stage ahead of GDT or MOV secondary clamps; placed across tip/ring with series impedance. Use Value: 10 µA leakage at 9.0 V prevents DC bias shift on analog line drivers; 15.4 V clamping preserves dynamic range of differential receivers. |
Use Scenario: Patient-connected ECG/EEG front-end amplifiers requiring low-leakage, certified surge protection on electrode inputs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between each input and reference ground to shunt ESD from human touch or defibrillation coupling. Use Value: UL 497B recognition confirms suitability for medical isolated circuits; <1 ns response protects amplifier inputs before internal ESD diodes activate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | Same VRWM (9.0 V) and VC (15.4 V), but lower PPK = 600 W; SMB package (smaller footprint, higher RJA = 195 °C/W). | Less suited for IEC 61000-4-5 Level 4; appropriate for space-constrained consumer electronics with lower surge exposure. | Select SMBJ9.0A only if layout area is constrained and surge threat level is limited to IEC 61000-4-2 ESD or low-energy EFT. |
| 1.5SMC9.0A | Identical electrical specs (VRWM, VBR, VC, PPK), same SMC package, but non-Pb-free; obsolete marking format (no "G" suffix). | No functional difference in protection performance; lacks RoHS compliance documentation and modern UL file traceability. | Prefer 1SMC9.0AT3 for new designs requiring RoHS compliance, UL 497B traceability, and long-term supply continuity. |
Compared with SMBJ9.0A and 1.5SMC9.0A, the 1SMC9.0AT3 uniquely combines 1500 W surge capacity, UL 497B certification, Pb-free compliance, and validated thermal performance on standard FR-4 - making it the preferred choice for industrial and automotive applications demanding regulatory alignment and robustness.
Availability
1SMC9.0AT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial RS-485 interface hardening, and telecom DSL line surge suppression requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for 1SMC9.0AT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMC9.0AT3 belongs to the SMC-series Zener TVS family, engineered specifically for high-energy transient suppression in harsh environments - emphasizing low clamping voltage, fast response, and regulatory compliance for mission-critical signal and power lines.
FAQ
What is the maximum clamping voltage of the 1SMC9.0AT3 under surge conditions?
The 1SMC9.0AT3 has a maximum clamping voltage (VC) of 15.4 V when subjected to its rated peak pulse current of 97.4 A (10/1000 µs waveform). This value is guaranteed across temperature and represents the highest voltage that will appear across the protected line during a full-power transient event - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings. The 1SMC9.0AT3 achieves this while maintaining low zener impedance and sub-1 ns response.
Is the 1SMC9.0AT3 suitable for bidirectional signal line protection?
No, the 1SMC9.0AT3 is a unidirectional TVS diode and is not suitable for bidirectional signal line protection such as USB D+/D− or RS-232 TX/RX without additional circuitry. Its design clamps only in reverse bias above VRWM = 9.0 V and conducts forward current like a standard diode below ~0.7 V. For bidirectional protection, a dedicated bidirectional TVS (e.g., 1SMC9.0AT3's counterpart in the 1SMC9.0CT3 series) or back-to-back unidirectional configuration would be required - the 1SMC9.0AT3 itself does not provide symmetrical clamping.
Does the 1SMC9.0AT3 meet UL 497B certification, and what does that mean for my design?
Yes, the 1SMC9.0AT3 is UL 497B recognized (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification verifies successful completion of rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming suitability for telecom, industrial control, and medical signal isolation barriers. Unlike basic flammability-only approvals, UL 497B validates functional surge protection integrity, reducing safety certification effort in end equipment.
What is the thermal resistance and derating behavior of the 1SMC9.0AT3 in real PCB layouts?
The 1SMC9.0AT3 has RJA = 165 °C/W on a standard FR-4 board using ON Semiconductor's minimum recommended footprint, and RJL = 18.3 °C/W under zero-lead-length conditions. Derating begins above 25°C ambient (for PD) or 75°C lead temperature (for PPK), with linear reduction per published curves. At 75°C ambient, its DC power dissipation drops to 0.375 W; at 100°C, it falls to 0.225 W. Proper copper pour and thermal vias are essential to maintain performance in sustained surge environments - the 1SMC9.0AT3's thermal design must account for both peak and average power.
How does the 1SMC9.0AT3 compare to older 1.5SMC9.0A variants in terms of reliability and compliance?
The 1SMC9.0AT3 supersedes the 1.5SMC9.0A with enhanced manufacturing controls, Pb-free (RoHS-compliant) packaging, updated UL 497B file traceability (E210057), and tighter process validation. While electrical parameters are identical, the 1SMC9.0AT3 offers documented compliance with J-STD-609, IPC/JEDEC J-STD-020 moisture sensitivity level (MSL 1), and extended temperature qualification (−65°C to +150°C). These improvements ensure higher long-term reliability and audit readiness - the 1SMC9.0AT3 is the recommended version for all new designs.
1SMC9.0AT3 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 97.4A
- 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
1SMC9.0AT3 FAQ
1.How can I place an order for 1SMC9.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC9.0AT3 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 1SMC9.0AT3 reliable?
The price and inventory of 1SMC9.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC9.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC9.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC9.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC9.0AT3?
1SMC9.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC9.0AT3 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 1SMC9.0AT3?
For technical support, including 1SMC9.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC9.0AT3 requirements.
6.How does Aetrix verify that 1SMC9.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC9.0AT3 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 1SMC9.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC9.0AT3?
All 1SMC9.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC9.0AT3, 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 1SMC9.0AT3 part is unused and in its original packaging.
Return procedure for 1SMC9.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC9.0AT3 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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