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onsemi 1SMA15CAT3
- Part No.:
- 1SMA15CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA15CAT3.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,248
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Product details
Overview
1SMA15CAT3 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 15 V working peak reverse voltage (VRWM), 24.4 V clamping voltage at 16.4 A peak pulse current, 400 pF junction capacitance at 0 V bias, and sub-1 ns response time. It is used in automotive power supply protection and industrial control I/O interfaces.
For engineers reviewing the 1SMA15CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. protected device's absolute maximum rating, surge current capability under 10/1000 µs waveform, and junction capacitance impact on high-speed signal integrity.
Technical Context
This device operates as a bidirectional avalanche diode, conducting symmetrically in both polarities once the reverse voltage exceeds its breakdown threshold (16.7–18.46 V at 1 mA). Its low zener impedance and flat handling surface support stable clamping during repetitive ESD or lightning-induced surges.
The SMA package (Case 403D) enables top-slide or bottom-mount PCB placement with thermal resistance of 250°C/W (junction-to-ambient) and 50°C/W (junction-to-lead), allowing effective heat dissipation during 1 ms transient events up to 400 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse voltage before clamping begins; must exceed circuit's peak operating voltage. |
| VBR (min/typ/max) | 16.7 / 17.58 / 18.46 V @ 1 mA - Confirmed avalanche onset range; defines minimum clamping threshold. |
| VC @ IPP | 24.4 V @ 16.4 A - Clamped voltage during 10/1000 µs surge; determines stress on downstream ICs. |
| PPK | 400 W @ 1 ms - Peak transient energy absorption capacity; validated per R.E.A. 10×1000 µs waveform. |
| CJ @ 0 V | 400 pF - Junction capacitance at zero bias; impacts signal rise time in data line protection. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model robustness for handling and board-level ESD immunity. |
| Response Time | <1 ns - Time from overvoltage onset to conduction; ensures protection before sensitive logic is damaged. |
Pinout & Package
Package: SMA (Case 403D), surface-mount, Pb-free, void-free transfer-molded plastic. Cathode polarity notch is non-functional; device is bidirectional and symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in forward conduction; voltage reference node in reverse clamp | Connected to lower-potential side of protected line; forms symmetrical clamp path with cathode. |
| Cathode | Current sink in forward conduction; voltage reference node in reverse clamp | Connected to higher-potential side of protected line; identical electrical role to anode due to bidirectionality. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak power rating | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) in properly designed layouts. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot relative to breakdown, reducing stress on downstream MOSFET gates or MCU I/O. |
| AEC-Q101 qualified (SZ variant) | Validated for automotive under-hood environments including temperature cycling and mechanical shock. |
| Flat handling surface | Ensures consistent pick-and-place accuracy and coplanarity during automated SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 120 V, 400 ms) on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp both positive and negative spikes. Use Value: Limits rail voltage to ≤24.4 V during 16.4 A surge, preventing damage to 36 V-rated CAN transceivers and microcontrollers. | Use Scenario: Protecting 24 V digital input modules from field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Standoff device across input terminals to shunt transient energy before it reaches optocoupler input stage. Use Value: 400 pF capacitance avoids signal distortion on 10 kHz switching inputs; 15 V VRWM matches common 24 V nominal supply with 20% tolerance. |
| Medical Equipment ESD Shielding | Telecom Line Interface Protection |
Use Scenario: Guarding USB and RS-232 ports on diagnostic imaging systems against hospital-grade ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS on each signal line referenced to local ground plane. Use Value: Sub-1 ns response captures HBM discharges before internal ESD structures activate; Class 3 rating meets IEC 61000-4-2 Level 4. | Use Scenario: Front-end surge suppression on Ethernet PHY differential pairs in PoE-powered access points. IC Role / Device Role / Timing Role: Common-mode clamp between pair and chassis ground, leveraging bidirectional symmetry. Use Value: 24.4 V clamping preserves PHY's 25 V absolute maximum rating; 400 W rating handles induced lightning surges per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA15CAT3G | AEC-Q101 qualified; identical electrical specs; includes SZ prefix denoting automotive-specific traceability and PPAP capability. | Required for automotive OEM designs requiring certified change control and lot traceability. | Select when automotive qualification and PPAP documentation are mandatory; otherwise 1SMA15CAT3 suffices. |
| 1SMA15CA | No "T3" suffix - supplied in 7-inch tape reel (3,000 pcs); same electrical specs and package. | Preferred for low-volume prototyping or legacy procurement where 13-inch reel equipment is unavailable. | Choose for compatibility with existing 7-inch tape feeders or small-batch builds without volume commitment. |
Compared with 1SMA15CAT3, SZ1SMA15CAT3G adds automotive compliance overhead but no performance change, while 1SMA15CA trades reel size for identical protection capability-enabling flexibility in manufacturing scale and qualification scope.
Availability
1SMA15CAT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O hardening, and medical equipment ESD shielding requiring stable component supply and long-term obsolescence management.
Supply support for 1SMA15CAT3 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 cloud power applications.
The 1SMAxxCAT3G series belongs to ON Semiconductor's SURMETIC® TVS portfolio, engineered specifically for high-reliability transient suppression in harsh environments where fast response, repeatable clamping, and thermal stability are critical.
FAQ
What is the working peak reverse voltage (VRWM) of the 1SMA15CAT3?
The 1SMA15CAT3 has a VRWM of 15 V, meaning it remains non-conductive up to this reverse voltage level under steady-state conditions. This value is selected to be ≥10% above typical 12 V nominal systems, ensuring reliable standoff while allowing sufficient margin before clamping initiates at its 16.7–18.46 V breakdown range. The 15 V VRWM directly determines minimum system voltage compatibility for the 1SMA15CAT3.
How does the 1SMA15CAT3 differ from unidirectional TVS diodes like 1SMA15AT3?
The 1SMA15CAT3 is bidirectional, providing symmetrical clamping for both positive and negative transients, making it ideal for AC signals or floating lines. In contrast, 1SMA15AT3 is unidirectional and only clamps in reverse bias, requiring careful polarity alignment. The 1SMA15CAT3 achieves this via internal back-to-back Zener configuration, resulting in identical anode/cathode behavior-no polarity marking is functional. This distinction is fundamental to correct 1SMA15CAT3 deployment.
What is the maximum clamping voltage (VC) of the 1SMA15CAT3 under surge conditions?
The 1SMA15CAT3 exhibits a maximum clamping voltage (VC) of 24.4 V when subjected to its rated 16.4 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This VC value represents the highest voltage seen by protected circuitry during worst-case surge events and must be verified against the absolute maximum ratings of downstream components. The 24.4 V clamping voltage is a guaranteed parameter for every 1SMA15CAT3 unit.
Is the 1SMA15CAT3 RoHS compliant and lead-free?
Yes, the 1SMA15CAT3 is a Pb-free device manufactured in ON Semiconductor's SURMETIC® package and complies with RoHS Directive 2011/65/EU. The "T3" suffix confirms tape-and-reel packaging in a 13-inch reel containing 5,000 units, all processed under ON Semiconductor's controlled Pb-free soldering and mounting protocols. Full compliance documentation for the 1SMA15CAT3 is available upon request.
What thermal derating applies to the 1SMA15CAT3 at elevated ambient temperatures?
The 1SMA15CAT3's DC power dissipation derates linearly above 25°C at 4.0 mW/°C, dropping from 0.5 W at 25°C to zero at approximately 150°C. For pulsed operation, peak power remains 400 W only at TL = 25°C; Figure 3 in the datasheet shows 10×1000 µs pulse derating to ~60% at 100°C ambient. Proper PCB copper area and layout are essential to maintain thermal performance for the 1SMA15CAT3 in real-world applications.
1SMA15CAT3 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 400pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA15CAT3 FAQ
1.How can I place an order for 1SMA15CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA15CAT3 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 1SMA15CAT3 reliable?
The price and inventory of 1SMA15CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA15CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMA15CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA15CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA15CAT3?
1SMA15CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA15CAT3 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 1SMA15CAT3?
For technical support, including 1SMA15CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA15CAT3 requirements.
6.How does Aetrix verify that 1SMA15CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA15CAT3 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 1SMA15CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMA15CAT3?
All 1SMA15CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA15CAT3, 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 1SMA15CAT3 part is unused and in its original packaging.
Return procedure for 1SMA15CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA15CAT3 Tags
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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