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onsemi 1SMC10AT3
- Part No.:
- 1SMC10AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC10AT3.pdf
- Description:
- TVS DIODE 10VWM 17VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,489
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Product details
Overview
1SMC10AT3 from ON Semiconductor is a unidirectional 1500 W 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 10 V working peak reverse voltage (VRWM), 17 V maximum clamping voltage at 88.2 A peak pulse current, and sub-1 ns response time. It is commonly deployed in automotive power line protection and industrial DC power supply input stages.
For engineers reviewing the 1SMC10AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC ≤ IC absolute maximum rating, IPP capability for expected surge energy, UL 497B recognition for isolated loop compliance, and SMC package thermal performance under sustained ambient conditions.
Technical Context
The 1SMC10AT3 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold (VBR = 11.1–12.3 V @ IT = 1 A). Its low dynamic impedance ensures stable clamping during fast transients, with typical junction-to-lead thermal resistance of 54.6 °C/W enabling robust 1500 W (1 ms) surge handling at TL = 25°C.
It is rated for −65 °C to +150 °C operating temperature, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits <5 µA leakage above 10 V. The device is Pb-free, RoHS-compliant, and UL 497B recognized for isolated loop circuit protection - a requirement in telecom and industrial interface designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 10 V - Maximum continuous reverse voltage the device blocks without clamping; must be ≥ system DC bus or signal swing voltage. |
| VBR (min/typ/max) | 11.1 / 11.7 / 12.3 V @ 1 A - Confirmed avalanche onset range; determines minimum clamping threshold under test conditions. |
| VC @ IPP | 17 V @ 88.2 A - Maximum voltage seen by protected circuit during 1 ms 1500 W surge; defines worst-case overvoltage exposure. |
| IPP | 88.2 A - Peak pulse current supported at 1 ms; correlates to IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge capability in properly designed circuits. |
| Response Time | <1 ns - Enables suppression before most logic or analog ICs experience latch-up or gate oxide damage from fast transients. |
| Leakage Current | <5 µA @ 10 V - Ensures negligible standby power loss and no signal distortion in high-impedance sensing or bias networks. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Validates suitability for primary-side isolation barrier protection in telecom/data line interfaces. |
Pinout & Package
Package: SMC (Case 403−03), surface-mount, void-free thermosetting plastic with modified L-bend leads and molded cathode notch. Dimensions: 5.59–6.10 mm × 6.60–7.11 mm × 1.90–2.41 mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or surge clamping | Connected to lower-potential side (e.g., ground or return path); polarity must match PCB silkscreen notch. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 12 V rail); marked by molded notch on package body per datasheet diagram. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (1 ms) | Supports high-energy surge immunity per IEC 61000-4-5 without derating at TL = 25°C; enables single-device protection for 24 V industrial buses. |
| Clamping voltage ≤17 V @ 88.2 A | Ensures protected ICs with 20 V absolute max rating (e.g., CAN transceivers, MCU I/O) remain within safe operating limits during worst-case surge. |
| ESD rating >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 (15 kV contact) for system-level ESD robustness without additional discrete ESD arrays. |
| UL 497B recognition | Validates use in safety-critical isolated loop applications (e.g., RS-485 fieldbus, PoE injectors) where regulatory certification is mandatory. |
| Pb-free Surmetic package | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for unlimited floor life at ≤30°C/60% RH. |
Applications
| Automotive Power Line Protection | Industrial DC Power Input |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V/100 ms) and alternator ripple. IC Role / Device Role: Primary parallel clamp on main power rail upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤17 V, preventing reset, latch-up, or permanent damage to 3.3 V/5 V logic powered from the same rail. |
Use Scenario: 24 V PLC I/O modules subjected to inductive kickback from solenoid drivers and relay coils. IC Role / Device Role: Rail-to-ground TVS on power input terminals, placed immediately after connector entry. Use Value: Absorbs 1500 W surges without degradation, maintaining system uptime and eliminating need for redundant fusing or varistors. |
| Telecom Isolated Interface | Medical Equipment Signal Lines |
Use Scenario: RS-485 data lines in building automation systems with long cable runs susceptible to induced lightning surges. IC Role / Device Role: Differential-line protector between transceiver and connector, referenced to isolated ground plane. Use Value: UL 497B certification confirms compliance with isolation barrier requirements, avoiding retesting of entire subsystem. |
Use Scenario: Analog sensor inputs (e.g., ECG front-end) requiring low-leakage, low-capacitance overvoltage protection. IC Role / Device Role: Low-leakage (<5 µA) unidirectional clamp on signal path to ADC input, referenced to precision analog ground. Use Value: Prevents input stage saturation during ESD events while introducing negligible offset error or noise in DC-coupled paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ10A | Same VRWM (10 V) and VC (17 V), but lower PPK = 600 W; SMB package has higher RJA (165 °C/W vs. 54.6 °C/W). | Not suitable for repeated 1500 W surges or high-ambient (>75°C) environments without thermal derating. | Select only if board space is constrained and surge duty cycle is infrequent/low energy. |
| 1.5SMC10A | Identical electrical specs and SMC package, but obsolete per ON Semi; replaced by 1SMC10AT3G with Pb-free marking. | No functional difference; legacy part may lack current UL 497B file validation or RoHS compliance documentation. | Prefer 1SMC10AT3 for new designs due to active status, documented UL recognition, and guaranteed Pb-free sourcing. |
Compared with SMBJ10A and 1.5SMC10A, the 1SMC10AT3 delivers superior thermal performance for high-duty-cycle surge environments, maintains full UL 497B compliance for certified isolated systems, and ensures long-term supply continuity with active manufacturing status and Pb-free assurance.
Availability
1SMC10AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC power inputs, telecom RS-485 interfaces, and medical sensor front-ends requiring stable component supply across multi-year production cycles.
Supply support for 1SMC10AT3 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, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMC10AT3 belongs to the SMC-series Zener TVS family, engineered specifically for high-reliability, high-power transient suppression in harsh environments where UL certification, surge robustness, and thermal stability are critical design requirements.
FAQ
What is the clamping voltage of the 1SMC10AT3 and how is it measured?
The 1SMC10AT3 has a maximum clamping voltage (VC) of 17 V, measured at a peak pulse current (IPP) of 88.2 A using a 1 ms exponential waveform per Figure 2 in the datasheet. This value represents the highest voltage the device allows across its terminals during a standardized surge event, ensuring downstream components see no more than 17 V even under full-rated stress. The 1SMC10AT3's low dynamic impedance contributes to this tightly controlled clamping behavior.
Is the 1SMC10AT3 suitable for bidirectional signal line protection?
No, the 1SMC10AT3 is a unidirectional TVS diode and must be used only in DC-biased or ground-referenced applications. It conducts in reverse breakdown to clamp positive transients on a line referenced to ground, but does not protect against negative-going surges. For bidirectional protection (e.g., AC lines or differential pairs), a dedicated bidirectional device such as the 1SMC10AT3's counterpart in the 1SMCxxAT3 series is required - though no bidirectional variant exists in this specific SMC-1500W family per the datasheet note.
Does the 1SMC10AT3 meet UL 497B requirements, and what does that mean for my design?
Yes, the 1SMC10AT3 carries UL 497B recognition (File #E210057, category QVGQ2) for protector-class applications in isolated loop circuits. This means it has passed rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge verification - validating its use in safety-critical telecom, industrial, and medical isolation barriers where regulatory approval is mandatory. The 1SMC10AT3's UL listing eliminates the need for system-level requalification of the protection scheme.
What is the thermal resistance of the 1SMC10AT3 and why does it matter?
The 1SMC10AT3 has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W, measured with zero lead length on FR-4 board. This low value enables efficient heat transfer from the silicon junction to the PCB copper, allowing the device to sustain its 1500 W peak power rating without thermal runaway. In contrast, its junction-to-ambient (RJA = 165 °C/W) is much higher, confirming that proper PCB copper pour and thermal vias are essential for reliable operation above 75°C ambient - a key consideration in the 1SMC10AT3's deployment.
How does the 1SMC10AT3 compare to older 1.5SMC10A parts?
The 1SMC10AT3 replaces the obsolete 1.5SMC10A with identical electrical specifications, SMC package, and performance - but adds Pb-free compliance (indicated by the 'G' suffix), updated UL 497B file validation, and active manufacturing status. Unlike the legacy 1.5SMC10A, the 1SMC10AT3 is fully supported with current datasheets, application notes, and long-term supply assurance, making it the only recommended choice for new designs requiring the 1SMC10AT3's protection profile.
1SMC10AT3 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):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 88.2A
- 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
1SMC10AT3 FAQ
1.How can I place an order for 1SMC10AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC10AT3 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 1SMC10AT3 reliable?
The price and inventory of 1SMC10AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC10AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC10AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC10AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC10AT3?
1SMC10AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC10AT3 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 1SMC10AT3?
For technical support, including 1SMC10AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC10AT3 requirements.
6.How does Aetrix verify that 1SMC10AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC10AT3 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 1SMC10AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC10AT3?
All 1SMC10AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC10AT3, 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 1SMC10AT3 part is unused and in its original packaging.
Return procedure for 1SMC10AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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