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onsemi 1SMA16CAT3
- Part No.:
- 1SMA16CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA16CAT3.pdf
- Description:
- TVS DIODE 16VWM 26VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,264
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Product details
Overview
1SMA16CAT3 from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed to protect sensitive electronics against ESD and surge events. It features a 16 V working peak reverse voltage (VRWM), 26.0 V clamping voltage (VC) at 15.4 A peak pulse current (IPP), and sub-1 ns response time. It is widely deployed in automotive power supply rails, industrial communication interfaces, and medical equipment input protection circuits.
For engineers reviewing the 1SMA16CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage headroom relative to IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, and junction capacitance (375 pF at 0 V) for high-speed signal line compatibility.
Technical Context
The 1SMA16CAT3 operates as a bidirectional Zener-based TVS diode, leveraging avalanche breakdown in both polarities to clamp transients above ±17.8 V (VBR min). Its low zener impedance and flat handling surface support stable mounting on FR-4 PCBs with ON Semiconductor's recommended 403D footprint.
It is rated for 400 W non-repetitive peak power at 1 ms pulse width (10/1000 µs waveform), with thermal resistance of 250 °C/W (junction-to-ambient) and 50 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature and −65 °C storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 16 V - Minimum continuous reverse standoff voltage; must exceed circuit's max DC/peak operating voltage to avoid leakage conduction. |
| VBR @ IT=1.0 A | 17.8–19.67 V - Breakdown threshold range; defines onset of clamping behavior under standardized test current. |
| VC @ IPP=15.4 A | 26.0 V - Maximum clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs. |
| IPP | 15.4 A - Peak pulse current supported at 26.0 V clamping; correlates directly to IEC 61000-4-5 Level 3/4 surge immunity. |
| CJ @ 0 V, 1 MHz | 375 pF - Junction capacitance; impacts signal integrity on data lines (e.g., RS-485, CAN FD); requires layout mitigation above ~10 Mbps. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model robustness; suitable for unshielded front-panel or connector interfaces. |
| Package | SMA (Case 403D) - Surface-mount plastic package with 2.6 mm nominal width, 4.3 mm length, and 1.14 mm height; compatible with standard reflow profiles. |
Pinout & Package
SMA package (Case 403D): surface-mount, bidirectional device with two terminals-cathode marked by polarity notch on body. Mounting position is unrestricted; flat handling surface enables accurate pick-and-place. Lead finish is Pb-free, solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (unmarked end) | Connected to lower-potential side of protected line; forms symmetrical clamping path with cathode during positive/negative transients. |
| Cathode | Terminal 2 (notch-marked end) | Connected to higher-potential side; polarity marking does not indicate functional directionality due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines (e.g., RS-485, USB D+/D−) without polarity constraints or external biasing. |
| 400 W peak power rating | Withstands IEC 61000-4-5 combination wave surges up to 1 kV/42 Ω (Level 3) and 2 kV/12 Ω (Level 4) without degradation. |
| Sub-1 ns response time | Activates before most microcontroller I/O structures can be damaged by fast-rising ESD events (e.g., contact discharge >15 kV). |
| AEC-Q101 qualified (SZ variant) | Validated for automotive under-hood and infotainment applications; includes PPAP documentation support and site-controlled manufacturing. |
| Low-profile SMA package | Enables placement adjacent to connectors or ICs on space-constrained PCBs while maintaining thermal performance via copper pad heatsinking. |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between VBAT and GND, upstream of LDOs and MCU power inputs. Use Value: Limits transient voltage to ≤26.0 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic supplies while surviving 400 W pulses. |
Use Scenario: Two-wire differential bus in factory automation PLCs subject to cable-induced surges and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS across A/B lines and to ground, providing common-mode and differential-mode suppression. Use Value: Clamps ±26.0 V transients without distorting 10 Mbps RS-485 signals, thanks to symmetric Zener structure and 375 pF capacitance managed via split-ground layout. |
| Medical Equipment Input Stage | Consumer Power Adapter EMI Filter |
|
Use Scenario: AC/DC adapter input stage in Class II medical devices requiring IEC 60601-1 4 kV surge immunity. IC Role / Device Role / Timing Role: First-line transient suppressor across live-neutral and live/neutral-to-earth paths in EMI filter section. Use Value: Absorbs 10/1000 µs surges up to 15.4 A while maintaining <2.5 µA leakage at 16 V, ensuring low standby power and regulatory compliance. |
Use Scenario: Secondary-side DC output protection in universal-input wall adapters for smartphones and IoT hubs. IC Role / Device Role / Timing Role: Output rail clamp between +5 V and GND, safeguarding USB port controllers and charging ICs. Use Value: Delivers 16 V standoff with 26.0 V clamping-tight enough to protect 5.5 V-rated USB PHYs yet high enough to avoid conduction during 5.25 V ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA16CAT3G | AEC-Q101 qualified; identical electrical specs but with automotive-grade traceability, PPAP documentation, and controlled manufacturing site. | Required for automotive OEM designs; supports ASIL-B system-level safety analysis where process control is mandated. | Select SZ1SMA16CAT3G when automotive qualification, change control, or PPAP submission is contractually required. |
| 1SMA16AT3G | Unidirectional version; same VRWM (16 V), VBR (17.8–19.67 V), and VC (26.0 V), but conducts only in reverse direction (anode grounded). | Suitable for DC-biased rails (e.g., 5 V logic supply) where forward conduction must be blocked to prevent short-circuit faults. | Choose 1SMA16AT3G only for unidirectional protection; verify grounding topology matches anode-to-GND configuration. |
Compared with 1SMA16CAT3, SZ1SMA16CAT3G adds automotive process rigor without altering electrical behavior, while 1SMA16AT3G trades bidirectionality for strict DC polarity control-neither is pin-compatible without circuit redesign.
Availability
1SMA16CAT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial RS-485 interface hardening, and medical equipment input stage surge suppression requiring stable component supply and long-term lifecycle assurance.
Supply support for 1SMA16CAT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and consumer markets.
The 1SMA16CAT3 belongs to the SMA-series Zener TVS family, engineered for high-energy transient suppression in cost-sensitive, high-volume applications where reliability under repetitive surge stress is critical.
FAQ
What is the maximum clamping voltage of the 1SMA16CAT3 under surge conditions?
The 1SMA16CAT3 exhibits a maximum clamping voltage (VC) of 26.0 V when subjected to its rated peak pulse current of 15.4 A under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and represents the worst-case voltage seen by downstream components during transient events. The 1SMA16CAT3 maintains this clamping performance across its full operating temperature range, making it suitable for environments where thermal derating must be minimized.
Is the 1SMA16CAT3 suitable for protecting high-speed data lines like USB 2.0?
The 1SMA16CAT3 has a junction capacitance of 375 pF at 0 V bias, which exceeds typical USB 2.0 full-speed (12 Mbps) or high-speed (480 Mbps) requirements-where <5 pF is preferred to avoid signal integrity loss. While the 1SMA16CAT3 provides robust surge protection, its capacitance makes it unsuitable for direct placement on USB D+/D− lines. For such applications, lower-capacitance TVS devices like the ESD9X series should be considered instead of the 1SMA16CAT3.
Does the 1SMA16CAT3 require a heatsink for continuous operation?
No, the 1SMA16CAT3 is not intended for continuous power dissipation. It is rated for 400 W peak power only under non-repetitive 1 ms pulses. Its DC power dissipation is limited to 0.5 W at 25°C ambient, derating linearly above that temperature. In normal operation, the 1SMA16CAT3 remains thermally idle until a transient occurs; therefore, no heatsink is required-only adherence to ON Semiconductor's recommended SMA footprint (FR-4 board, 1 in² copper pad) ensures adequate pulse thermal management.
How does the 1SMA16CAT3 differ from the unidirectional 1SMA16AT3G?
The 1SMA16CAT3 is bidirectional, meaning it clamps transients of either polarity across its terminals, while the 1SMA16AT3G is unidirectional and conducts only when the cathode is more positive than the anode. Both share identical VRWM (16 V), VBR (17.8–19.67 V), and VC (26.0 V) values, but their circuit integration differs: the 1SMA16CAT3 connects across any floating or AC-coupled node, whereas the 1SMA16AT3G must be grounded at its anode for proper DC-biased rail protection. Substituting one for the other requires schematic and layout changes.
What is the ESD robustness rating of the 1SMA16CAT3?
The 1SMA16CAT3 is rated for Class 3 ESD immunity per the Human Body Model (HBM), with a minimum withstand voltage exceeding 16 kV. This rating is verified per ANSI/ESDA/JEDEC JS-001 and confirms the device's ability to absorb multiple high-voltage electrostatic discharges without parameter shift or failure-making it appropriate for use on exposed ports, buttons, or connectors in consumer and industrial equipment where operator interaction is frequent. The 1SMA16CAT3 achieves this through optimized Zener junction geometry and low-inductance SMA packaging.
1SMA16CAT3 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 375pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA16CAT3 FAQ
1.How can I place an order for 1SMA16CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA16CAT3 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 1SMA16CAT3 reliable?
The price and inventory of 1SMA16CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA16CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMA16CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA16CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA16CAT3?
1SMA16CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA16CAT3 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 1SMA16CAT3?
For technical support, including 1SMA16CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA16CAT3 requirements.
6.How does Aetrix verify that 1SMA16CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA16CAT3 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 1SMA16CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMA16CAT3?
All 1SMA16CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA16CAT3, 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 1SMA16CAT3 part is unused and in its original packaging.
Return procedure for 1SMA16CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA16CAT3 Tags
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