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onsemi 1SMA30AT3G
- Part No.:
- 1SMA30AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA30AT3G.pdf
- Description:
- TVS DIODE 30VWM 48.4VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,262
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Product details
Overview
1SMA30AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed to protect sensitive electronics against ESD and surge events. It features a 30 V working peak reverse voltage (VRWM), 48.4 V clamping voltage at 8.3 A peak pulse current, 2.5 µA max reverse leakage at VRWM, and sub-1 ns response time. It is used in power supply input protection and industrial control I/O interfaces.
For engineers reviewing the 1SMA30AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 10/1000 µs waveform, thermal derating above 75°C, and compatibility with SMA package footprint on FR-4 PCBs.
Technical Context
The 1SMA30AT3G operates as a unidirectional avalanche diode, conducting only during positive transients applied to its cathode. Its breakdown voltage is specified at 33.3–36.8 V (min/typ/max) with 1 mA test current, ensuring predictable turn-on behavior under overvoltage stress.
It delivers 400 W peak pulse power for 1 ms per the 10/1000 µs standard waveform, with junction-to-lead thermal resistance of 50 °C/W enabling effective heat dissipation into the PCB copper pad. The device meets Class 3 HBM ESD rating (>16 kV) and is Pb-free, qualified to AEC-Q101 for automotive use when ordered as SZ1SMA30AT3G.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's DC or peak AC rail voltage. |
| VBR @ IT=1 mA | 33.3–36.8 V - Breakdown threshold range; defines minimum voltage at which avalanche conduction initiates reliably. |
| VC @ IPP=8.3 A | 48.4 V - Clamping voltage under 10/1000 µs surge; determines maximum voltage seen by protected downstream components. |
| IPP | 8.3 A - Peak pulse current supported at VC; correlates directly with energy absorption (E ≈ ½ × VC × IPP × t). |
| IR @ VRWM | 2.5 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| Response Time | < 1 ns - Time from transient onset to clamping onset; critical for protecting fast logic and communication interfaces. |
| Junction Capacitance | 405 pF @ 0 V - Capacitive loading on signal lines; impacts high-frequency signal integrity and bandwidth in data path protection. |
Pinout & Package
SMA package (Case 403D, Style 1), surface-mount, low-profile plastic housing with molded cathode band. Flat handling surface supports accurate pick-and-place; mountable in top-slide or bottom-board orientation. RoHS-compliant, Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked with band) | Transient current sink node | Connected to protected line; conducts surge current to ground when voltage exceeds VRWM. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping current loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without thermal runaway on standard FR-4 layouts. |
| ESD rating >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 (15 kV contact) for system-level ESD immunity without additional front-end filtering. |
| Low zener impedance | Ensures stable clamping voltage across varying surge currents, minimizing voltage overshoot during fast-rising transients. |
| SURMETIC® package reliability | Void-free transfer-molded construction provides moisture resistance and mechanical stability for automotive and industrial reflow cycles. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module Inputs |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers from induced surges on long field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to clamp transients before they reach optocoupler or microcontroller GPIO. Use Value: Limits voltage to ≤48.4 V during 8.3 A surge, preserving input stage integrity while maintaining <2.5 µA leakage at nominal 24 V operation. | Use Scenario: Safeguarding LIN bus or sensor inputs in body control modules exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector interface to absorb fast ESD events and slower battery reversal spikes. Use Value: Sub-1 ns response prevents latch-up in connected transceivers; AEC-Q101 qualification supports automotive production deployment. |
| AC/DC Power Supply Input Stage | Medical Equipment Signal Conditioning Inputs |
Use Scenario: Secondary-side overvoltage suppression on +12 V or +15 V rails after rectification and filtering in offline SMPS designs. IC Role / Device Role / Timing Role: Clamp diode placed across output capacitor to prevent regulator damage during no-load overvoltage faults or transformer ringing. Use Value: 400 W peak power handles repetitive switching transients; 50 °C/W RJL allows direct thermal coupling to copper pour for sustained reliability. | Use Scenario: Protecting analog front-end amplifiers and ADC inputs in diagnostic imaging equipment from ESD during cable handling or probe connection. IC Role / Device Role / Timing Role: Low-capacitance (405 pF) TVS placed immediately before precision amplifier input to avoid signal distortion. Use Value: 2.5 µA leakage avoids DC offset errors; clamping at 48.4 V preserves amplifier common-mode range during 15 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA30AT3G | AEC-Q101 qualified; identical electrical specs and package; includes automotive-specific PPAP documentation and traceability. | Required for automotive OEM BOMs where qualification and change control are mandated. | Select when automotive production compliance (not just ruggedness) is contractually required. |
| 1.5SMC30A | Higher 1500 W peak power; larger SMC package (7.1 mm x 6.2 mm); 55 V clamping at 27.3 A; 1000 pF capacitance. | Better suited for primary-side AC line protection or high-energy industrial motor drives. | Choose only if surge energy exceeds 400 W capability and board space permits SMC footprint. |
Compared with SZ1SMA30AT3G, the original 1SMA30AT3G lacks automotive qualification documentation but matches all electrical and thermal performance; versus 1.5SMC30A, it trades lower surge capacity and smaller size for tighter layout integration and reduced parasitic capacitance in signal-path protection.
Availability
1SMA30AT3G is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control module inputs, and AC/DC power supply input stage designs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for 1SMA30AT3G 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, sensors, and discrete devices for automotive, industrial, and consumer markets.
The 1SMAxxAT3G series was developed to deliver cost-effective, high-reliability transient suppression in compact surface-mount packages for voltage-sensitive circuits across transportation, automation, and medical electronics.
FAQ
What is the clamping voltage of the 1SMA30AT3G under standard surge conditions?
The 1SMA30AT3G has a maximum clamping voltage (VC) of 48.4 V when subjected to an 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured at TJ = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events. The 1SMA30AT3G maintains this clamping performance across its specified operating temperature range, making it suitable for environments where thermal stability is critical.
Is the 1SMA30AT3G suitable for bidirectional signal line protection?
No, the 1SMA30AT3G is a unidirectional TVS diode and conducts only when the cathode is driven positive relative to the anode. It is not designed for bidirectional protection such as RS-485 or USB data lines. For those applications, a bidirectional variant like 1SMA30CAT3G must be used. The 1SMA30AT3G is optimized for DC power rail and single-polarity I/O protection where reverse conduction is not required.
What is the thermal resistance and power derating behavior of the 1SMA30AT3G?
The 1SMA30AT3G has a junction-to-lead thermal resistance (RJL) of 50 °C/W and a junction-to-ambient resistance (RJA) of 250 °C/W on a standard FR-4 board. Its DC power dissipation is rated at 1.5 W at TL = 75°C, derating linearly above that temperature. At TA = 25°C, it supports 0.5 W continuous dissipation. These values are validated using ON Semiconductor's recommended minimum footprint, and actual thermal performance depends on PCB copper area and airflow.
Does the 1SMA30AT3G meet automotive qualification standards?
The base 1SMA30AT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMA30AT3G shares identical electrical and mechanical specifications and is fully AEC-Q101 qualified with PPAP capability. If automotive production compliance is required, SZ1SMA30AT3G must be specified. The 1SMA30AT3G remains appropriate for industrial and commercial applications where qualification documentation is not mandated.
How does the junction capacitance of the 1SMA30AT3G affect high-speed signal lines?
The 1SMA30AT3G exhibits a typical junction capacitance of 405 pF at 0 V bias, which may degrade signal integrity on high-frequency lines (>1 MHz) due to added loading and potential rise-time degradation. It is best suited for DC power rails and low-speed digital I/O. For high-speed data lines, lower-capacitance TVS devices (e.g., <100 pF) should be selected. The 1SMA30AT3G's capacitance is stable across bias voltage, supporting predictable performance in analog sensing paths.
1SMA30AT3G 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 405pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA30AT3G FAQ
1.How can I place an order for 1SMA30AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA30AT3G 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 1SMA30AT3G reliable?
The price and inventory of 1SMA30AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA30AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA30AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA30AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA30AT3G?
1SMA30AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA30AT3G 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 1SMA30AT3G?
For technical support, including 1SMA30AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA30AT3G requirements.
6.How does Aetrix verify that 1SMA30AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA30AT3G 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 1SMA30AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA30AT3G?
All 1SMA30AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA30AT3G, 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 1SMA30AT3G part is unused and in its original packaging.
Return procedure for 1SMA30AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA30AT3G Tags
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