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onsemi 1SMA11CAT3
- Part No.:
- 1SMA11CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA11CAT3.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,849
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Product details
Overview
1SMA11CAT3 from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 11 V working peak reverse voltage (VRWM), 12.27 V maximum breakdown voltage (VBR), 17.0 V clamping voltage (VC) at 23.5 A peak pulse current, and <1 ns response time. It is used in automotive power supply protection and industrial control I/O interfaces.
For engineers reviewing the 1SMA11CAT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge, junction capacitance (580 pF), and AEC−Q101-qualified alternatives for robust overvoltage design.
Technical Context
The 1SMA11CAT3 operates as a bidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp both positive and negative transients. Its low zener impedance and fast <1 ns response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-2/5.
It is rated for 400 W peak pulse power (10/1000 µs waveform), with thermal resistance of 250 °C/W (junction-to-ambient) and 50 °C/W (junction-to-lead). The device uses ON Semiconductor's SURMETIC® SMA package (Case 403D), optimized for surface-mount reliability in high-vibration environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin. |
| VBR (max) | 12.27 V @ 1 mA - Upper limit of Zener breakdown threshold; defines worst-case turn-on point. |
| VC @ IPP | 17.0 V @ 23.5 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| Peak Power | 400 W - Sustained for 1 ms per non-repetitive surge; defines single-event energy handling capability. |
| Junction Capacitance | 580 pF @ 0 V - Impacts high-frequency signal integrity; relevant for data line protection above ~1 MHz. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model immunity; suitable for unshielded connector interfaces. |
| Response Time | <1 ns - Enables suppression of fast-rising transients before downstream ICs are damaged. |
Pinout & Package
SMA package (Case 403D), surface-mount, bidirectional configuration with cathode notch marking. Dimensions: 4.06–4.57 mm length × 2.29–2.92 mm width × 1.97–2.20 mm height. RoHS-compliant, Pb-free, rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during negative transient | Connects to lower-potential node (e.g., GND or signal return); forms symmetrical clamping path with cathode. |
| Cathode | Current entry terminal during positive transient | Marked by notch; connects to higher-potential node (e.g., VBUS or signal line); enables bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal paths without polarity constraints (e.g., RS-485, CAN bus lines). |
| 400 W peak pulse rating | Handles IEC 61000-4-5 Level 3 surges (1 kV, 2 Ω source) on 12 V systems without failure. |
| Low clamping ratio (VC/VBR = 1.39) | Minimizes overvoltage overshoot relative to breakdown; improves margin for 12 V logic and analog ICs. |
| AEC−Q101 qualified | Validated for automotive under-hood and infotainment applications requiring temperature cycling, humidity, and mechanical shock compliance. |
| Flat handling surface | Enables precise pick-and-place placement and consistent solder joint formation on automated SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between VBAT and GND, upstream of DC/DC converters. Use Value: Limits transient voltage to ≤17.0 V, preventing damage to 16 V-rated regulators and microcontrollers. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff TVS connected across input terminals to shunt surge energy before optocoupler input stage. Use Value: Withstands repeated 400 W surges while maintaining leakage <2.5 µA at 11 V, ensuring stable logic thresholds. |
| Medical Equipment ESD Interface Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB and serial ports on diagnostic imaging devices exposed to clinical ESD events. IC Role / Device Role / Timing Role: Secondary-level TVS on board-level connectors, complementing system-level filters. Use Value: Class 3 HBM rating (>16 kV) meets IEC 61000-4-2 Level 4, reducing field failure rates in hospital environments. | Use Scenario: Front-end protection for Ethernet PHY interfaces in outdoor base station line cards. IC Role / Device Role / Timing Role: Bidirectional clamp on differential pairs (e.g., MDI) to suppress common-mode surges. Use Value: 580 pF capacitance balanced across pins minimizes skew and insertion loss up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA11CAT3G | AEC−Q101 qualified; identical electrical specs; automotive-grade traceability and PPAP support. | Required for Tier 1 automotive BOMs; same footprint and clamping performance. | Select when automotive qualification, change control, or extended temperature validation is mandatory. |
| 1SMA11CA | Same electrical specs but in legacy tape-and-reel (no "T3" suffix); no Pb-free assurance or SURMETIC® branding. | Legacy industrial designs where RoHS exemption applies; not recommended for new designs. | Use only for obsolescence replacement in pre-2010 designs; verify Pb-free compliance separately. |
Compared with 1SMA11CAT3, SZ1SMA11CAT3G adds automotive process controls without altering clamping behavior, while 1SMA11CA lacks documented Pb-free status and modern packaging reliability-making the T3G variant the preferred choice for new production.
Availability
1SMA11CAT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O hardening, and medical equipment ESD interface protection requiring stable component supply and full traceability.
Supply support for 1SMA11CAT3 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 solutions for automotive, industrial, and cloud power applications.
The 1SMA11CAT3 belongs to the SMA-series Zener TVS family, engineered for high-surge, surface-mount overvoltage protection in space-constrained, high-reliability systems such as engine control units and programmable logic controllers.
FAQ
What is the clamping voltage of the 1SMA11CAT3 under a standard 10/1000 µs surge?
The 1SMA11CAT3 clamps to 17.0 V at 23.5 A peak pulse current under a 10/1000 µs waveform, as specified in the ON Semiconductor datasheet. This VC value ensures protected circuits experience no more than 17.0 V during surge events, critical for safeguarding 12 V-rated components. The 1SMA11CAT3 maintains this performance across its operating temperature range of −65 °C to +150 °C.
Is the 1SMA11CAT3 suitable for automotive applications?
Yes-the 1SMA11CAT3 is manufactured in ON Semiconductor's SURMETIC® package and shares the same electrical specifications as the AEC−Q101-qualified SZ1SMA11CAT3G. While the base 1SMA11CAT3 part number itself is not explicitly certified, its construction, test methodology, and qualification lineage support use in non-safety-critical automotive subsystems like body control modules. For full compliance, specify SZ1SMA11CAT3G.
What is the junction capacitance of the 1SMA11CAT3, and how does it affect high-speed signals?
The 1SMA11CAT3 exhibits 580 pF typical junction capacitance at 0 V bias and 1 MHz, per the datasheet. This value limits its use on high-speed data lines (e.g., USB 2.0 or HDMI), where sub-10 pF is typical. It remains appropriate for lower-frequency interfaces such as RS-232, RS-485, or 10/100BASE-TX Ethernet PHY protection, where capacitance-induced signal degradation is acceptable.
Does the 1SMA11CAT3 have polarity markings, and how is it mounted?
Yes-the 1SMA11CAT3 uses a cathode notch on the package body to identify the cathode terminal. It is a bidirectional device, so orientation matters only for mechanical alignment-not electrical function. Mounting is surface-mount (SMA package, Case 403D), compatible with standard reflow profiles including peak temperatures up to 260 °C for 10 seconds. The flat handling surface supports accurate pick-and-place placement.
How does the 1SMA11CAT3 compare to unidirectional TVS diodes like the 1SMA11AT3G?
The 1SMA11CAT3 provides symmetrical clamping for both polarities, making it ideal for AC-coupled or floating lines (e.g., CAN, RS-485). In contrast, the unidirectional 1SMA11AT3G clamps only in reverse bias and conducts freely in forward bias-suited for DC rails with defined polarity. Both share identical VRWM (11 V), VBR, and peak power (400 W), but the 1SMA11CAT3's bidirectionality eliminates need for external series blocking diodes.
1SMA11CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 530pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA11CAT3 FAQ
1.How can I place an order for 1SMA11CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA11CAT3 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 1SMA11CAT3 reliable?
The price and inventory of 1SMA11CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA11CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMA11CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA11CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA11CAT3?
1SMA11CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA11CAT3 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 1SMA11CAT3?
For technical support, including 1SMA11CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA11CAT3 requirements.
6.How does Aetrix verify that 1SMA11CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA11CAT3 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 1SMA11CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMA11CAT3?
All 1SMA11CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA11CAT3, 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 1SMA11CAT3 part is unused and in its original packaging.
Return procedure for 1SMA11CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA11CAT3 Tags
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