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onsemi 1SMC14AT3
- Part No.:
- 1SMC14AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC14AT3.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,501
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Product details
Overview
1SMC14AT3 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 14 V working peak reverse voltage (VRWM), 23.2 V maximum clamping voltage at 64.7 A peak pulse current, and sub-1 ns response time. It is widely deployed in industrial power supplies and automotive control modules where robust overvoltage immunity is required.
For engineers reviewing the 1SMC14AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under IEC 61000-4-5 surge waveforms, thermal derating at elevated ambient temperatures, and UL 497B recognition for isolated loop circuit protection.
Technical Context
The 1SMC14AT3 operates as a Zener-based unidirectional TVS diode with avalanche breakdown behavior triggered above its specified VRWM of 14 V. Its clamping action begins at 15.6 V (min VBR @ IT = 1 A) and limits transient voltage to ≤23.2 V at 64.7 A IPP, ensuring downstream ICs remain within safe operating voltage windows.
It uses ON Semiconductor's Surmetic SMC package (Case 403), rated for 260°C soldering, and exhibits low zener impedance and <1 ns intrinsic response time. The device complies with UL 497B for isolated loop circuit protection and meets Class 3 ESD immunity (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14 V - Maximum continuous reverse operating voltage before clamping initiates; must exceed system DC/peak AC rail voltage. |
| VBR (min @ IT=1 A) | 15.6 V - Minimum breakdown voltage ensures reliable turn-on above VRWM with defined margin. |
| VC @ IPP | 23.2 V - Clamping voltage at 64.7 A peak pulse current; defines worst-case voltage seen by protected load. |
| PPK | 1500 W @ 1 ms - Peak surge power rating per non-repetitive 10/1000 µs waveform; determines energy absorption capability. |
| IR @ VRWM | 5 µA max - Reverse leakage at 14 V ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Response Time | <1 ns - Intrinsic avalanche delay enables suppression before most microsecond-scale transients fully develop. |
| UL Recognition | UL 497B (QVGQ2) - Certified for use in isolated loop protectors, covering strike voltage, endurance, dielectric withstand, and discharge testing. |
Pinout & Package
1SMC14AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a molded cathode notch polarity indicator and modified L-bend leads for enhanced pad adhesion. 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 | Current entry terminal during forward conduction or transient clamping | Connected to ground or low-impedance return path; forms clamping loop with cathode tied to protected line. |
| Cathode | Current exit terminal during clamping; marked by molded notch | Tied to the voltage rail requiring protection; conducts surge current to ground when VRWM is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity without external series impedance. |
| Clamping ratio VC/VBR = 1.48 | Low ratio indicates efficient voltage limiting with minimal overvoltage margin beyond breakdown. |
| UL 497B certified | Validated for safety-critical isolated loop applications including telecom interfaces and sensor signal conditioning. |
| Pb-free SMC package | RoHS-compliant Surmetic molding enables lead-free reflow assembly without compromising thermal reliability. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 for system-level ESD protection without additional discrete ESD devices. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 12 V input rails in DIN-rail mounted AC/DC converters exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed directly across input terminals to limit voltage excursions to ≤23.2 V during 100 A surge events. Use Value: Prevents latch-up or destruction of upstream rectifiers and downstream PWM controllers during ISO 7637-2 Pulse 5a transients. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against battery reversal and alternator load dump in door module ECUs. IC Role / Device Role / Timing Role: Localized TVS on each protected signal line, leveraging sub-1 ns response to suppress fast-edge spikes before they propagate into silicon. Use Value: Eliminates need for external series resistors or RC filters while maintaining signal integrity up to 20 kbps LIN data rates. |
| Medical Equipment Input Stage | Programmable Logic Controller I/O |
Use Scenario: Shielding 24 V auxiliary power inputs in patient-monitoring devices from EFT bursts and electrostatic discharges in clinical environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply rail, coordinated with secondary ceramic capacitors to reduce overshoot induced by PCB trace inductance. Use Value: Achieves IEC 61326-1 immunity compliance without redesigning front-end filtering, reducing BOM count by one stage. |
Use Scenario: Protecting digital input channels on modular PLC backplanes from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Point-of-entry TVS on each channel's optocoupler input side, absorbing 1500 W transients before isolation barrier. Use Value: Extends mean time between failures (MTBF) of input modules by preventing cumulative degradation of internal LED drivers under repeated surge stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Lower peak power (600 W), same VRWM (14 V), higher clamping voltage (23.8 V @ 25.1 A) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients like ESD or EFT. | Select SMBJ14A only when space constraints prohibit SMC footprint and surge requirements are ≤600 W. |
| 1.5SMC14A | Same 1500 W rating and identical electrical specs, but obsolete marking and legacy packaging documentation | No functional difference; however, 1.5SMC14A lacks current UL 497B file #E210057 listing and Pb-free G-suffix confirmation. | Prefer 1SMC14AT3 for new designs requiring documented UL recognition and RoHS compliance traceability. |
Compared with SMBJ14A and 1.5SMC14A, the 1SMC14AT3 delivers superior surge robustness for high-energy applications while providing certified safety compliance and modern Pb-free assembly support-making it the preferred choice for industrial and automotive front-end protection where reliability and regulatory alignment are critical.
Availability
1SMC14AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, medical equipment input stages, and programmable logic controller I/O modules requiring stable component supply across multi-year production cycles.
Supply support for 1SMC14AT3 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, sensors, and discrete components for automotive, industrial, and cloud power applications.
The 1SMC14AT3 belongs to the SMC-series transient voltage suppressor family, engineered specifically for high-energy surge immunity in harsh electromagnetic environments where rapid clamping and long-term reliability are mandatory.
FAQ
What is the clamping voltage of the 1SMC14AT3 at its rated peak pulse current?
The 1SMC14AT3 has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPP) of 64.7 A, measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is critical for verifying compatibility with downstream component absolute maximum ratings. The 1SMC14AT3 maintains this clamping performance across its qualified temperature range of −65 °C to +150 °C.
Does the 1SMC14AT3 meet UL 497B certification, and what does that cover?
Yes, the 1SMC14AT3 is UL Recognized under file #E210057 to UL 497B for protectors, covering rigorous testing including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric voltage-withstand, and discharge performance. This certification validates its suitability for isolated loop circuit protection in safety-critical applications such as telecom interfaces and industrial sensor networks-distinct from basic flammability-only recognition held by some competitors. The 1SMC14AT3 carries this certification as part of the full SMC-series qualification.
Can the 1SMC14AT3 be used in bidirectional protection configurations?
No, the 1SMC14AT3 is explicitly a unidirectional TVS diode, as confirmed by the datasheet's "Unidirectional*" designation and absence of bidirectional device markings or specifications. It conducts only during reverse overvoltage conditions and blocks forward current beyond its 3.5 V forward voltage limit. For AC or bipolar signal line protection, a dedicated bidirectional variant such as 1SMC14AT3G (not offered in this series) or separate back-to-back unidirectional devices would be required-not the 1SMC14AT3 itself.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMC14AT3, and why does it matter?
The 1SMC14AT3 has a thermal resistance from junction-to-lead (RJL) of 18.3 °C/W, measured with zero lead length on a 1 in² copper pad. This parameter governs how efficiently heat generated during surge conduction transfers from the silicon junction to the PCB copper, directly impacting safe repetitive surge capability and steady-state power dissipation limits. A lower RJL-like the 18.3 °C/W of the 1SMC14AT3-enables higher allowable average power at elevated board temperatures compared to higher-RJL alternatives, supporting reliable operation in thermally constrained enclosures.
How does the 1SMC14AT3's response time affect its effectiveness in protecting fast digital interfaces?
The 1SMC14AT3 features a typical response time of less than 1 ns, meaning it transitions from high-impedance blocking to low-impedance clamping faster than most nanosecond-scale ESD or EFT transients can rise. This allows it to suppress voltage overshoot before it reaches vulnerable CMOS inputs-even on high-speed lines-provided layout minimizes parasitic inductance. While the 1SMC14AT3 itself responds rapidly, its real-world effectiveness on digital interfaces depends on proper placement adjacent to connectors and short, direct routing to ground, as PCB inductance dominates total protection latency more than the 1SMC14AT3's intrinsic delay.
1SMC14AT3 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 64.7A
- 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
1SMC14AT3 FAQ
1.How can I place an order for 1SMC14AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC14AT3 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 1SMC14AT3 reliable?
The price and inventory of 1SMC14AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC14AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC14AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC14AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC14AT3?
1SMC14AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC14AT3 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 1SMC14AT3?
For technical support, including 1SMC14AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC14AT3 requirements.
6.How does Aetrix verify that 1SMC14AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC14AT3 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 1SMC14AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC14AT3?
All 1SMC14AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC14AT3, 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 1SMC14AT3 part is unused and in its original packaging.
Return procedure for 1SMC14AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC14AT3 Tags
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