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onsemi 1SMA11CAT3G
- Part No.:
- 1SMA11CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA11CAT3G.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,892
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Product details
Overview
1SMA11CAT3G from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) in SMA package, with 11 V working peak reverse voltage (VRWM), 17.0 V clamping voltage at 23.5 A peak pulse current, and <1 ns response time. It protects sensitive electronics against ESD (>16 kV HBM) and high-energy transients in DC power supply rails and I/O interfaces.
For engineers reviewing the 1SMA11CAT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, and junction capacitance (580 pF @ 0 V) for signal integrity in data lines.
Technical Context
This device operates as a bidirectional avalanche diode, clamping both positive and negative transients by entering breakdown when reverse voltage exceeds VBR (11.1–12.27 V at 1 mA). Its low zener impedance and flat handling surface support stable mounting on FR-4 PCBs with ON Semiconductor's recommended 403D footprint.
Designed for single-pulse transient suppression per R.E.A. 10/1000 µs waveform, it delivers 400 W peak power at TL = 25°C with thermal derating above 75°C (20 mW/°C), and exhibits typical junction capacitance of 580 pF at 0 V bias-critical for high-speed interface protection where capacitive loading must be constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail or signal swing. |
| VBR @ IT=1 mA | 11.1–12.27 V - Breakdown threshold range; defines onset of protective conduction under controlled test conditions. |
| VC @ IPP=23.5 A | 17.0 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPK | 400 W - Peak pulse power handling for non-repetitive 1 ms events; validates robustness against lightning or EFT. |
| CJ @ 0 V, 1 MHz | 580 pF - Junction capacitance affecting signal rise time and bandwidth; limits use in >10 Mbps data lines. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model ESD immunity; qualifies for unshielded board-level interfaces. |
| TJ Range | −65 °C to +150 °C - Operating junction temperature span; supports under-hood automotive and industrial ambient extremes. |
Pinout & Package
Package: SMA (Case 403D), surface-mount, Pb-free, void-free molded plastic with corrosion-resistant finish and solderable leads. Mounting position is unrestricted; polarity indicated by cathode notch (non-functional for bidirectional operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during negative surges and positive surges relative to cathode. |
| Cathode | Transient return path (bidirectional) | Connects to reference plane (e.g., GND or VCC); symmetric conduction enables dual-polarity clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines without polarity constraints-no need to distinguish anode/cathode orientation in layout. |
| 400 W peak power @ 1 ms | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems. |
| <1 ns response time | Engages before most IC input structures are damaged by fast-rising ESD or EFT events. |
| Flat handling surface | Enables precise automated placement and consistent solder joint formation on fine-pitch SMT lines. |
| AEC-Q101 qualified (SZ variant) | Validated for automotive under-hood applications; 1SMA11CAT3G shares design and process with qualified SZ1SMA11CAT3G. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module I/O |
|---|---|
Use Scenario: DC input stage of programmable logic controller (PLC) power supply exposed to inductive switching noise and load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V rail, placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤17.0 V, preventing damage to 36 V-rated input MOSFETs and enabling compliance with IEC 61000-4-4 Level 4. | Use Scenario: LIN bus transceiver pins in door module subjected to battery disconnect spikes and ESD contact discharge. IC Role / Device Role / Timing Role: Bidirectional TVS across LIN signal and ground, co-located with connector. Use Value: 580 pF capacitance avoids LIN timing distortion while clamping ±30 V transients to safe levels for TJA1020-level receivers. |
| Medical Equipment Sensor Interface | Point-of-Sale Terminal USB Port |
Use Scenario: Analog front-end of patient monitoring device with isolated thermistor and ECG inputs routed through metal enclosures. IC Role / Device Role / Timing Role: Secondary protection on shielded analog traces, after primary common-mode choke. Use Value: 16 kV HBM rating ensures reliability during clinical handling; low leakage (<2.5 µA @ 11 V) preserves microvolt-level signal accuracy. | Use Scenario: VBUS and D+/D− lines of embedded USB 2.0 port in retail kiosk exposed to frequent plug/unplug and static discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS array (discrete 1SMA11CAT3G per line) on each signal path. Use Value: 17.0 V clamping prevents USB PHY latch-up; 580 pF meets USB 2.0 eye diagram mask up to 480 Mbps with minimal jitter impact. |
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 and package; differs only in traceability and PPAP documentation. | Required for automotive OEM BOMs mandating qualified parts; same PCB layout and performance. | Select when automotive qualification and change control are mandatory; otherwise 1SMA11CAT3G suffices for industrial use. |
| SMBJ11CA | Higher PPK (600 W), larger SMB package (Case 403AC), 19.9 V clamping at 30.2 A, 550 pF capacitance. | Better suited for higher-energy threats (e.g., ISO 16750-2 load dump); requires larger board area and different footprint. | Choose when surge margin must exceed 400 W and board space allows SMB; not drop-in compatible due to package size and thermal pad requirements. |
Compared with SZ1SMA11CAT3G, the 1SMA11CAT3G offers identical protection performance without automotive documentation overhead; versus SMBJ11CA, it trades lower surge rating and smaller footprint for tighter capacitive loading-making it optimal for space-constrained, medium-threat applications like industrial USB or sensor nodes.
Availability
1SMA11CAT3G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical sensor interfaces, and point-of-sale terminal designs requiring stable component supply and RoHS-compliant packaging.
Supply support for 1SMA11CAT3G 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 supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The 1SMA11CAT3G belongs to the SMA-series transient voltage suppressor family, engineered specifically for cost-sensitive, high-volume board-level ESD and surge protection where compact size, fast response, and reliable clamping are essential.
FAQ
What is the maximum clamping voltage of the 1SMA11CAT3G under standard surge conditions?
The 1SMA11CAT3G has a maximum clamping voltage (VC) of 17.0 V when subjected to its rated peak pulse current of 23.5 A under the standardized 10/1000 µs waveform. This value is measured at TJ = 25°C and defines the upper voltage limit imposed on protected circuits during transient events. Designers must ensure this clamping level remains below the absolute maximum ratings of downstream components. The 1SMA11CAT3G datasheet specifies this parameter in Table 3 under "Clamping Voltage @ IPP".
Is the 1SMA11CAT3G suitable for protecting USB 2.0 data lines?
The 1SMA11CAT3G can protect USB 2.0 VBUS lines effectively due to its 17.0 V clamping and 400 W surge rating, but its 580 pF junction capacitance exceeds typical recommendations for D+ and D− differential pairs, which require <5–10 pF to avoid signal integrity degradation. For full USB 2.0 compliance, dedicated low-capacitance TVS arrays are preferred; however, the 1SMA11CAT3G remains viable for VBUS-only protection in host-side applications where capacitance is less critical. Always verify eye diagram compliance when using 1SMA11CAT3G on high-speed lines.
Does the 1SMA11CAT3G have automotive qualification?
The 1SMA11CAT3G itself is not AEC-Q101 qualified; however, its functionally identical counterpart SZ1SMA11CAT3G is fully AEC-Q101 qualified and PPAP capable. Both share identical electrical characteristics, package dimensions (SMA, Case 403D), and thermal performance. The "SZ" prefix denotes automotive-grade traceability and process control, while the "1SMA" prefix targets industrial and commercial applications. For automotive designs requiring formal qualification, SZ1SMA11CAT3G must be specified-but the 1SMA11CAT3G may be used in pre-production validation or non-OEM automotive subsystems where qualification is not mandated.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMA11CAT3G?
The thermal resistance from junction-to-lead (RJL) for the 1SMA11CAT3G is 20°C/W, measured under conditions of zero lead length on a 1 in² copper pad on FR-4 board. This parameter governs heat dissipation during short-duration pulses and directly impacts safe operating area under repetitive surge conditions. Derating begins above 75°C at 20 mW/°C, meaning maximum DC power dissipation drops from 1.5 W at 75°C to 1.3 W at 85°C. Accurate thermal modeling using RJL is essential when deploying multiple 1SMA11CAT3G devices in proximity or under elevated ambient temperatures.
How does the bidirectional nature of the 1SMA11CAT3G affect PCB layout?
The bidirectional architecture of the 1SMA11CAT3G eliminates polarity sensitivity-its anode and cathode terminals behave identically under positive or negative transients-so no orientation marking is required during placement. This simplifies pick-and-place programming and reduces assembly errors. However, the cathode notch on the SMA package is non-functional and must not be used as a polarity indicator. Layout best practices still apply: minimize trace inductance by placing the 1SMA11CAT3G as close as possible to the protected node and connecting both terminals directly to low-impedance reference planes (e.g., GND or VCC) with short, wide traces.
1SMA11CAT3G 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
1SMA11CAT3G FAQ
1.How can I place an order for 1SMA11CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA11CAT3G 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 1SMA11CAT3G reliable?
The price and inventory of 1SMA11CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA11CAT3G is usually 5 days.
3.What payment methods are accepted for 1SMA11CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA11CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA11CAT3G?
1SMA11CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA11CAT3G 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 1SMA11CAT3G?
For technical support, including 1SMA11CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA11CAT3G requirements.
6.How does Aetrix verify that 1SMA11CAT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA11CAT3G 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 1SMA11CAT3G meets industry standards.
7.What is the process for return or replacement of 1SMA11CAT3G?
All 1SMA11CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA11CAT3G, 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 1SMA11CAT3G part is unused and in its original packaging.
Return procedure for 1SMA11CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA11CAT3G Tags
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