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onsemi 1SMC15AT3
- Part No.:
- 1SMC15AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMC15AT3.pdf
- Description:
- TVS DIODE 15V 24.4V SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,236
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Product details
Overview
1SMC15AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of DC power rails and signal lines. It features a 15 V working peak reverse voltage (VRWM), 16.4 V nominal breakdown voltage (VBR) at 1 mA test current, 24.4 V maximum clamping voltage (VC) at 61.5 A peak pulse current, and sub-1 ns response time. It is used in automotive power supply inputs, industrial PLC I/O modules, and telecom line interface circuits.
For engineers reviewing the 1SMC15AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < protected IC's absolute maximum rating, low zener impedance for fast clamping, UL 497B recognition for isolated loop compliance, and SMC package thermal performance under repetitive surge conditions.
Technical Context
The 1SMC15AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its VBR. Its clamping action begins within <1 ns of overvoltage onset, with VC defined at IPP = 61.5 A using a 10/1000 µs waveform per IEC 61000-4-5.
It is rated for 1500 W non-repetitive peak pulse power at TL = 25°C, derates linearly above 75°C with RJL = 18.3 °C/W, and supports forward surge current up to 200 A (8.3 ms half-sine). The device meets UL 497B for isolated loop circuit protection and exhibits <5 µA leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse voltage before clamping begins; must be ≥ circuit's DC operating voltage. |
| VBR (min/typ/max) | 15.6 / 16.4 / 17.2 V @ IT = 1 mA - Ensures reliable turn-on margin above VRWM with tight distribution. |
| VC @ IPP | 24.4 V @ 61.5 A - Clamped voltage during 10/1000 µs surge; defines upper bound on protected node voltage. |
| PPK | 1500 W @ 1 ms - Peak transient energy handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | 5 µA max - Low leakage preserves efficiency in high-impedance bias networks and battery-powered systems. |
| Response Time | <1 ns - Enables suppression of fast ESD events (IEC 61000-4-2) before downstream IC damage occurs. |
| UL Recognition | UL 497B (QVGQ2 File #E210057) - Certified for use in isolated communication loops requiring safety-rated surge protection. |
Pinout & Package
1SMC15AT3 is housed in the SMC (Case 403) surface-mount plastic package, featuring a cathode-indicating molded notch and modified L-bend leads for enhanced solder joint reliability. The package measures 5.59–6.10 mm × 6.60–7.11 mm × 1.90–2.41 mm (L × W × H) and supports 260°C reflow for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse-biased clamping | Connected to ground or low-impedance return path; carries full surge current during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); polarity notch on package body identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Validated for IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) without degradation. |
| Clamping voltage ≤24.4 V @ 61.5 A | Ensures protected 15 V logic or analog circuits remain below 25 V absolute maximum rating during worst-case surge. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 (±8 kV contact / ±15 kV air) without external series impedance. |
| UL 497B certified | Approved for use in safety-critical isolated interfaces (e.g., RS-485, CAN, PoE) without additional certification overhead. |
| Low zener impedance & fast response | Minimizes voltage overshoot during nanosecond-scale transients; reduces need for layout-optimized placement. |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O 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 TVS placed between power rail and chassis ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Withstands 1500 W peak pulses and maintains VC ≤24.4 V, preventing latch-up or gate oxide rupture in downstream 28 V-tolerant ICs. | Use Scenario: 24 V digital input channels in programmable logic controllers subjected to field-wiring induced transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on each channel to shunt induced surges from long cables before reaching optocoupler or Schmitt trigger inputs. Use Value: UL 497B recognition ensures compliance in safety-rated control systems; low IR avoids false triggering in high-impedance sense circuits. |
| Telecom Line Interface Protection | Medical Equipment Power Supply Ingress |
Use Scenario: Primary-side protection on AC/DC adapters feeding VoIP phones or base stations connected to PSTN lines. IC Role / Device Role / Timing Role: First-stage clamping device on secondary-side DC output, coordinated with MOVs and gas discharge tubes on primary side. Use Value: Sub-1 ns response captures fast-rising lightning-induced surges; 15 V VRWM matches common 12–15 V adapter outputs without leakage penalty. | Use Scenario: Secondary-side DC rail protection in Class II medical power supplies (e.g., patient monitors) where isolation integrity is critical. IC Role / Device Role / Timing Role: UL 497B-certified TVS on isolated 5 V/12 V rails to prevent surge propagation across reinforced insulation barriers. Use Value: Certification eliminates need for separate safety review; 24.4 V VC ensures protected analog front-end ICs (e.g., ADCs, amplifiers) stay within safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMC15AT3G | AEC-Q101 qualified; identical electrical specs; Pb-free SMC package with SZ prefix denoting automotive-grade traceability and PPAP support. | Required for automotive OEM designs needing qualification documentation and change control. | Select SZ1SMC15AT3G when automotive qualification, PPAP submission, or site-specific manufacturing controls are mandatory. |
| 1.5SMC15A | Same VRWM/VBR/VC ratings; identical 1500 W PPK; differs only in packaging (standard SMC vs. ON Semi's SURMETIC™ variant) and marking. | No functional difference; used interchangeably in industrial and consumer designs where AEC-Q101 is not required. | Choose 1.5SMC15A for cost-sensitive non-automotive applications with identical performance and footprint compatibility. |
Compared with 1SMC15AT3, SZ1SMC15AT3G adds AEC-Q101 qualification and PPAP capability for automotive use, while 1.5SMC15A offers identical electrical behavior in a functionally equivalent SMC package-neither is pin-compatible by default but shares identical PCB footprint and thermal profile.
Availability
1SMC15AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom power supply designs requiring stable component supply, consistent surge performance, and long-term lifecycle availability.
Supply support for 1SMC15AT3 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, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1SMC15AT3 belongs to the SMC-series Zener TVS family, engineered for high-energy transient suppression in harsh environments where reliability, UL certification, and fast clamping response are critical.
FAQ
What is the maximum clamping voltage of the 1SMC15AT3 under standard surge conditions?
The 1SMC15AT3 has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 61.5 A using the standardized 10/1000 µs waveform. This value is guaranteed across temperature and production lot, ensuring predictable protection margins for 15 V systems. The 1SMC15AT3 achieves this clamping performance while maintaining low dynamic impedance and sub-1 ns response time.
Is the 1SMC15AT3 RoHS compliant and lead-free?
Yes, the 1SMC15AT3 is manufactured in a Pb-free (RoHS-compliant) SMC package per ON Semiconductor's SURMETIC™ specification. The "T3" suffix denotes tape-and-reel packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 requirements. The 1SMC15AT3 supports standard lead-free reflow profiles up to 260°C for 10 seconds without degradation.
Does the 1SMC15AT3 require external series impedance for ESD protection?
No, the 1SMC15AT3 does not require external series impedance for basic IEC 61000-4-2 ESD protection due to its >16 kV Human Body Model rating and <1 ns response time. However, for high-speed data lines (e.g., USB, HDMI), a series resistor may still be needed to limit current into sensitive PHY inputs-this is independent of the 1SMC15AT3's clamping function. The 1SMC15AT3 itself operates effectively as a standalone shunt protector on power rails and low-frequency signal paths.
How does the 1SMC15AT3 compare to bidirectional TVS diodes in surge protection?
The 1SMC15AT3 is unidirectional and optimized for DC power rail protection where polarity is fixed, offering lower leakage (<5 µA at VRWM) and tighter VBR tolerance than comparable bidirectional parts. Bidirectional TVS diodes (e.g., 1SMC15CA) are used for AC or floating signals but exhibit higher capacitance and leakage. For 12–15 V DC systems, the 1SMC15AT3 provides superior efficiency and noise immunity-its design intentionally excludes bidirectional variants per the datasheet footnote.
Can the 1SMC15AT3 be used in parallel to increase surge current handling?
No, the 1SMC15AT3 is not recommended for parallel operation due to mismatch in VBR and dynamic impedance, which causes uneven current sharing and potential thermal runaway. ON Semiconductor specifies single-device usage per protected node. To handle higher surge currents, select a higher-power TVS (e.g., 5.0SMDJ15A) or implement staged protection with upstream MOVs-never parallel multiple 1SMC15AT3 units without derating and thermal validation.
1SMC15AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1SMC15AT3 FAQ
1.How can I place an order for 1SMC15AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC15AT3 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 1SMC15AT3 reliable?
The price and inventory of 1SMC15AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC15AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC15AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC15AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC15AT3?
1SMC15AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC15AT3 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 1SMC15AT3?
For technical support, including 1SMC15AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC15AT3 requirements.
6.How does Aetrix verify that 1SMC15AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC15AT3 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 1SMC15AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC15AT3?
All 1SMC15AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC15AT3, 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 1SMC15AT3 part is unused and in its original packaging.
Return procedure for 1SMC15AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC15AT3 Tags
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