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onsemi 1SMA15AT3G
- Part No.:
- 1SMA15AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA15AT3G.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:218,090
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Product details
Overview
1SMA15AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping overvoltage transients in DC power rails and signal lines. It features a 15 V working peak reverse voltage (VRWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V clamping voltage (VC) at 16.4 A peak pulse current, and <1 ns response time - deployed in automotive power supplies and industrial I/O protection.
For engineers reviewing the 1SMA15AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, thermal derating above 75°C, and Pb-free SMA package compatibility with automated SMT assembly.
Technical Context
The 1SMA15AT3G operates as a unidirectional avalanche diode, conducting only during negative transients relative to its cathode. Its clamping action begins at VBR (min 16.7 V), stabilizes at VC = 24.4 V under 16.4 A IPP, and maintains low dynamic impedance across surge events. It is not intended for continuous regulation but for transient energy diversion.
Thermal performance is defined by RJL = 50 °C/W (junction-to-lead) and RJA = 250 °C/W (junction-to-ambient), requiring PCB copper area for sustained power handling. The device meets AEC-Q101 stress requirements when used within its −65°C to +150°C operating range and 260°C/10 s soldering limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse voltage before significant leakage; must exceed circuit's normal operating voltage. |
| VBR @ IT = 1 mA | 16.7–18.5 V - Avalanche onset range; defines minimum clamping threshold under standardized test conditions. |
| VC @ IPP = 16.4 A | 24.4 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream components. |
| PPK | 400 W - Peak pulse power handling for non-repetitive 1 ms transients; defines single-event surge robustness. |
| IR @ VRWM | 2.5 µA max - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <1 ns - Time from transient onset to conduction; enables protection of high-speed logic and microcontrollers. |
| Junction Capacitance | 758 pF @ 0 V - Capacitive loading on protected line; impacts high-frequency signal integrity and EMI filtering design. |
Pinout & Package
1SMA15AT3G uses the SMA (DO-214AC) surface-mount package per CASE 403D, with molded cathode band polarity marking and flat handling surface for precise pick-and-place placement. Package dimensions: 4.06–4.57 mm length (E), 2.29–2.92 mm width (D), 1.97–2.20 mm height (A), and 0.76–1.52 mm lead length (L).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink node | Connected to protected line; conducts surge current to ground or lower-potential rail during overvoltage. |
| Anode | Reference potential node | Typically tied to ground or common return path; completes current loop during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity without external series impedance. |
| ESD rating >16 kV HBM | Eliminates need for separate ESD diodes on board-level interfaces like USB, CAN, or sensor inputs. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications with extended temperature and life testing. |
| Pb-free SURMETIC® package | Enables RoHS-compliant reflow soldering at 260°C/10 s without delamination or voiding. |
| Low profile, top/bottom mountable | Fits space-constrained layouts in motor control modules and compact power converters. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary overvoltage clamp on main power input, placed upstream of LDOs and MCU power pins. Use Value: Limits transient voltage to ≤24.4 V, preventing damage to 28 V-rated power management ICs and ensuring ASIL-B functional safety compliance. |
Use Scenario: 24 V digital input channels in programmable logic controllers receiving signals from field sensors and switches. IC Role / Device Role: Front-end transient suppressor on each input channel, paired with series resistor and optocoupler. Use Value: Absorbs IEC 61000-4-4 EFT bursts (4 kV) and prevents latch-up in input buffer ICs without degrading 1 kHz switching response. |
| Medical Equipment AC/DC Adapter Output | Telecom Power Supply Secondary Side |
|
Use Scenario: Output of isolated 5 V/12 V medical-grade AC/DC adapters powering patient monitoring subsystems. IC Role / Device Role: Secondary-side TVS protecting analog front-end ADCs and isolated communication interfaces (e.g., SPI isolators). Use Value: Maintains <2.5 µA leakage at 15 V, avoiding offset drift in precision biopotential amplifiers while clamping surges to safe levels. |
Use Scenario: +48 V DC distribution bus in telecom rectifier modules feeding PoE injectors and baseband processors. IC Role / Device Role: Point-of-load transient suppressor on intermediate 12 V or 5 V rails derived from primary 48 V bus. Use Value: Provides 400 W surge capacity compatible with Telcordia GR-1089-CORE lightning-induced surge profiles without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA15AT3G | AEC-Q101 certified with PPAP documentation; identical electrical specs and SMA package. | Required for automotive OEM production programs needing full traceability and change control. | Select SZ1SMA15AT3G when automotive qualification evidence (e.g., PPAP Level 3) is contractually mandated. |
| 1.5SMC15A | Same VRWM/VBR/VC, but SMC (DO-214AB) package: larger footprint (7.11 × 6.22 mm vs. 4.57 × 2.92 mm) and higher thermal mass. | Better steady-state power dissipation (1.5 W vs. 0.5 W at 25°C), suited for higher ambient temperature environments. | Choose 1.5SMC15A where board space allows and thermal derating above 75°C is critical for long-term reliability. |
Compared with 1SMA15AT3G, SZ1SMA15AT3G adds automotive process controls without altering performance, while 1.5SMC15A trades compact size for improved thermal handling - enabling selection based on qualification needs or thermal constraints rather than electrical function.
Availability
1SMA15AT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical power adapters, and telecom power supplies requiring stable component supply, RoHS compliance, and AEC-Q101 traceability.
Supply support for 1SMA15AT3G 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 1SMAxxAT3G series was developed to deliver high-surge-capability, surface-mount TVS protection for cost-sensitive, high-volume applications where reliability under repetitive transients is essential.
FAQ
What is the maximum clamping voltage of the 1SMA15AT3G under surge conditions?
The 1SMA15AT3G has a maximum clamping voltage (VC) of 24.4 V when subjected to a 10/1000 µs surge waveform with peak current (IPP) of 16.4 A. This value is measured per standard test conditions in the ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components tolerate this clamped voltage level.
Is the 1SMA15AT3G suitable for bidirectional signal line protection?
No, the 1SMA15AT3G is a unidirectional TVS diode and conducts only in reverse bias - it cannot protect against positive-going transients on grounded lines or AC-coupled signals. For bidirectional protection, ON Semiconductor offers the 1SMA15CAT3G variant. Using 1SMA15AT3G on bidirectional lines risks failure during positive excursions beyond its forward voltage rating.
What is the thermal resistance of the 1SMA15AT3G, and how does it affect layout?
The 1SMA15AT3G has a junction-to-ambient thermal resistance (RJA) of 250 °C/W on a standard FR-4 board with minimum recommended footprint. To maintain safe junction temperatures during repeated surges, designers must provide adequate copper area - typically ≥1 in² (645 mm²) of 2 oz copper connected to both terminals - otherwise thermal derating reduces effective power handling below 0.5 W at 25°C ambient.
Does the 1SMA15AT3G meet automotive qualification standards?
The standard 1SMA15AT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMA15AT3G is fully AEC-Q101 qualified and PPAP capable. Both share identical electrical parameters and SMA packaging, but only SZ1SMA15AT3G carries the required test reports and process controls for automotive production. Always verify part marking ('SZ' prefix) for automotive use.
How does the junction capacitance of 758 pF impact high-frequency circuit design?
The 758 pF junction capacitance of the 1SMA15AT3G at 0 V bias introduces significant reactive loading on protected lines above ~1 MHz. In high-speed interfaces (e.g., USB 2.0, CAN FD), this capacitance can distort edge rates and increase bit error rates. For such applications, lower-capacitance TVS devices (e.g., <100 pF) or series impedance matching should be considered alongside the 1SMA15AT3G.
1SMA15AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- 758pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA15AT3G FAQ
1.How can I place an order for 1SMA15AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA15AT3G 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 1SMA15AT3G reliable?
The price and inventory of 1SMA15AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA15AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA15AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA15AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA15AT3G?
1SMA15AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA15AT3G 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 1SMA15AT3G?
For technical support, including 1SMA15AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA15AT3G requirements.
6.How does Aetrix verify that 1SMA15AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA15AT3G 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 1SMA15AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA15AT3G?
All 1SMA15AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA15AT3G, 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 1SMA15AT3G part is unused and in its original packaging.
Return procedure for 1SMA15AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA15AT3G Tags
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