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onsemi 1SMA16AT3
- Part No.:
- 1SMA16AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMA16AT3.pdf
- Description:
- TVS 400W 16V UNIDIRECT SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
1SMA16AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) with 16 V working peak reverse voltage (VRWM), 18.75 V nominal breakdown voltage (VBR), and 26.0 V clamping voltage (VC) at 15.4 A peak pulse current (IPP). It features <1 ns response time, 16 kV ESD rating (HBM), and is housed in the SMA (DO-214AC) package for PCB-level surge protection in DC power rails.
For engineers reviewing the 1SMA16AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating curves, polarity marking details, and direct alternatives for overvoltage protection design in automotive power supplies, industrial controllers, and medical equipment interfaces.
Technical Context
The 1SMA16AT3 operates as a unidirectional avalanche diode, clamping transients above VRWM = 16 V by entering breakdown at VBR = 18.75 V (min 17.8 V, max 19.7 V) with IT = 1 mA. Its low zener impedance and fast <1 ns response enable effective suppression of EFT and lightning-induced surges.
Thermal performance is defined by RJA = 250 °C/W (TA = 25°C) and RJL = 20 °C/W (TL = 75°C), supporting 0.5 W DC dissipation at ambient and 1.5 W at lead temperature, with full derating above those thresholds per Figure 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 16 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 18.75 V (nominal) - precise avalanche onset point for reliable threshold control |
| VC @ IPP=15.4 A | 26.0 V - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 400 W - peak pulse power handling capability per 1 ms non-repetitive surge |
| Response Time | <1 ns - enables suppression of nanosecond-scale ESD and EFT events |
| ESD Rating (HBM) | >16 kV - meets IEC 61000-4-2 Level 4 for system-level robustness |
| Polarity | Cathode indicated by molded band - ensures correct orientation during automated placement |
Pinout & Package
1SMA16AT3 uses the SMA (DO-214AC) surface-mount package (Case 403D-02), measuring 4.06–4.57 mm × 2.29–2.92 mm × 1.91–2.41 mm (L×W×H), with flat handling surface and low-profile design optimized for top-slide or bottom-board mounting. Polarity is marked by a cathode band on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / surge return path | Connected to ground or low-impedance reference plane during clamping |
| Cathode | Zener breakdown terminal / protected line connection | Connected to the voltage rail requiring protection (e.g., 12 V input) |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) surge compliance without external series impedance |
| <1 ns response time | Clamps sub-microsecond transients before sensitive ICs experience overstress |
| 16 kV HBM ESD rating | Eliminates need for additional discrete ESD protection on board-level interfaces |
| Pb-free (G suffix) Surmetic package | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
| Flat handling surface | Enables high-accuracy pick-and-place placement with ≤50 µm positional tolerance |
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 jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp surges up to 400 W without failure. Use Value: Limits voltage to ≤26.0 V during 15.4 A surge, protecting downstream LDOs and microcontrollers rated for 36 V absolute max. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in noisy factory environments. IC Role / Device Role / Timing Role: Standoff protector on each channel, absorbing repetitive EFT bursts (IEC 61000-4-4) and contact bounce spikes. Use Value: Maintains VRWM = 16 V margin above 24 V nominal, ensuring no leakage at operating voltage while responding in <1 ns. |
| Medical Equipment AC/DC Adapter Interface | Telecom Power Supply DC Output Rail |
Use Scenario: Secondary-side 12 V output of isolated AC/DC adapter powering patient-monitoring analog front-end. IC Role / Device Role / Timing Role: Final-stage transient suppressor guarding against coupling from primary-side switching noise and external cable discharges. Use Value: Clamps to 26.0 V with 15.4 A IPP, preventing latch-up in precision ADCs and op-amps with 30 V absolute max ratings. |
Use Scenario: +48 V DC output rail in telecom rectifier modules subject to hot-swap and backplane transients. IC Role / Device Role / Timing Role: Parallel-connected TVS array (multiple 1SMA16AT3 units) providing scalable 400 W per device surge capacity. Use Value: Enables modular protection architecture with predictable clamping behavior and validated thermal derating up to 75°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ16A | Same VRWM (16 V), higher PPK = 600 W, larger SMB (DO-214AA) package (5.3 mm × 4.6 mm) | Higher surge margin for IEC 61000-4-5 Level 5; requires larger PCB footprint | Select when 600 W surge headroom is required and board space allows SMB footprint |
| 1.5SMC16A | Same VRWM (16 V), identical PPK = 400 W, but SMC (DO-214AB) package (7.1 mm × 6.2 mm) | Lower thermal resistance (RJA ≈ 150 °C/W) supports higher average power in confined layouts | Select when improved steady-state thermal performance is critical and SMC mounting is acceptable |
Compared with SMBJ16A and 1.5SMC16A, the 1SMA16AT3 offers optimal balance of compact SMA footprint, certified 400 W surge capability, and proven manufacturability in high-volume automotive and industrial assemblies - making it preferred where board area is constrained but full IEC 61000-4-5 Level 4 compliance is mandatory.
Availability
1SMA16AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and medical power supply designs requiring stable component supply, RoHS-compliant packaging, and traceable lot-level surge performance validation.
Supply support for 1SMA16AT3 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 onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMA16AT3 belongs to the 1SMAxxAT3 series of unidirectional TVS diodes engineered specifically for cost-sensitive, high-reliability PCB-level transient suppression - targeting applications where space, surge margin, and manufacturability must coexist without compromise.
FAQ
What is the maximum clamping voltage of the 1SMA16AT3 under standard test conditions?
The 1SMA16AT3 exhibits a maximum clamping voltage (VC) of 26.0 V when subjected to its rated peak pulse current (IPP) of 15.4 A using the 10/1000 µs waveform. This value is measured per Figure 2 in the official ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during surge events.
Does the 1SMA16AT3 have a Pb-free option, and how is it identified?
Yes, the 1SMA16AT3 is available in a Pb-free version denoted by the "G" suffix (i.e., 1SMA16AT3G), compliant with RoHS Directive 2011/65/EU. The "G" marking appears in the ordering code and corresponds to ON Semiconductor's Surmetic package processed per JEDEC J-STD-020 reflow standards.
How does the 1SMA16AT3 differ from bidirectional TVS diodes like the 1SMA16CAT3?
The 1SMA16AT3 is unidirectional and functions only during reverse-biased transients, while the 1SMA16CAT3 is bidirectional and clamps both positive and negative excursions. The 1SMA16AT3 has lower leakage near VRWM and is suited for DC rail protection; the 1SMA16CAT3 is used where AC-coupled or bipolar signal lines require symmetrical clamping.
What is the thermal resistance from junction to ambient (RJA) for the 1SMA16AT3, and how does it affect layout?
The 1SMA16AT3 has RJA = 250 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This high thermal resistance means PCB copper area must be maximized around the SMA pads - especially for repeated surge events - to avoid exceeding TJ(max) = +150°C during operation.
Can the 1SMA16AT3 be used in place of a Zener diode for voltage regulation?
No - the 1SMA16AT3 is optimized for transient suppression, not steady-state regulation. Its VBR tolerance (±5%) and high dynamic impedance make it unsuitable for precision voltage references. For regulation, use dedicated Zener diodes such as the 1N4744A (15 V) or BZX84-C16, which specify tighter tolerance and lower zener impedance at DC bias.
1SMA16AT3 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:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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1SMA16AT3 FAQ
1.How can I place an order for 1SMA16AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA16AT3 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 1SMA16AT3 reliable?
The price and inventory of 1SMA16AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA16AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA16AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA16AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA16AT3?
1SMA16AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA16AT3 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 1SMA16AT3?
For technical support, including 1SMA16AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA16AT3 requirements.
6.How does Aetrix verify that 1SMA16AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA16AT3 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 1SMA16AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA16AT3?
All 1SMA16AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA16AT3, 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 1SMA16AT3 part is unused and in its original packaging.
Return procedure for 1SMA16AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA16AT3 Tags
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