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onsemi 1SMA30AT3
- Part No.:
- 1SMA30AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA30AT3.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,804
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Product details
Overview
1SMA30AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for overvoltage protection in DC power rails and signal lines. It features a 30 V working peak reverse voltage (VRWM), 35.05 V nominal breakdown voltage (VBR) at 1 mA test current, 48.4 A maximum peak pulse current (IPP), and clamps transients to ≤48.4 V at rated surge. It is used in automotive power supplies and industrial control I/O protection.
For engineers reviewing the 1SMA30AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, clamping voltage margin relative to protected IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, and SMA package thermal performance on FR-4 PCBs.
Technical Context
The 1SMA30AT3 operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its breakdown threshold while remaining high-impedance under normal bias. Its low zener impedance and <1 ns response time enable fast clamping of ESD and lightning-induced surges.
It is rated for 400 W non-repetitive peak power at 1 ms pulse width (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature. The device supports 40 A forward surge current and exhibits ≤2.5 µA reverse leakage at 30 V VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's max DC or peak AC voltage. |
| VBR (min/typ/max) | 33.3 / 35.05 / 36.8 V @ 1 mA - Confirms Zener conduction onset; typ value defines design margin for clamping threshold. |
| VC @ IPP | 48.4 V @ 48.4 A - Clamped voltage during full-rated surge; determines maximum stress on downstream components. |
| PPK | 400 W @ 1 ms - Peak transient energy absorption capacity under standard 10/1000 µs waveform. |
| IR @ VRWM | ≤2.5 µA - Ensures minimal leakage current in standby, critical for low-power or battery-backed systems. |
| Response Time | <1 ns - Enables suppression of fast ESD events (IEC 61000-4-2) before sensitive logic is damaged. |
Pinout & Package
Package: SMA (DO-214AC), case outline 403D-02, surface-mount plastic package with cathode polarity indicated by band. Dimensions: 4.06–4.57 mm (L) × 2.29–2.92 mm (W) × 1.91–2.41 mm (H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal; connected to lower-potential side of protected line | Completes current path during reverse surge; must be routed with low-inductance trace to ground or return path. |
| Cathode | Zener breakdown terminal; connected to higher-potential side (e.g., VCC or signal line) | Defines clamping reference; polarity band must align with PCB silkscreen to prevent misassembly. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without failure. |
| ESD rating >16 kV HBM | Meets or exceeds Class 3 ESD immunity requirements for end-equipment compliance testing. |
| Low profile SMA package | Enables compact placement near connectors or IC power pins without height interference in stacked assemblies. |
| Flat handling surface | Ensures consistent pick-and-place accuracy during automated SMT assembly, reducing tombstoning risk. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rail against load dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamping overvoltage spikes before they reach DC-DC converter input. Use Value: Limits peak voltage to 48.4 V, within 80% of typical 60 V automotive IC absolute maximum rating. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element placed between terminal block and optocoupler input stage. Use Value: Absorbs 400 W surges with <1 ns response, preventing false triggering or latch-up in isolation interface ICs. |
| Medical Equipment Power Supply Input | Telecom Line Card Surge Protection |
Use Scenario: Safeguarding isolated 12 V auxiliary supply in patient-monitoring devices against AC line transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC output prior to LDO regulator. Use Value: Maintains ≤2.5 µA leakage at 12 V, preserving standby current budget in battery-backed systems. | Use Scenario: Front-end protection for Ethernet PHY power pins exposed to lightning-induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Fast-response shunt suppressor placed directly at connector entry point. Use Value: Clamps 10/1000 µs surges to 48.4 V within nanoseconds, meeting GR-1089-CORE Level 3 surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Same VRWM (30 V) and VC (48.4 V), but 600 W PPK rating in larger SMB package | Better thermal dissipation for repetitive surge environments; requires larger PCB footprint | Select when surge repetition rate exceeds 1 pulse/minute or ambient temperature exceeds 75°C |
| P6SMB30A | Identical electrical specs (VRWM=30 V, VBR=33.3–36.8 V, VC=48.4 V), same 400 W rating, SMB package | Legacy ON Semi part with identical performance but different marking and packaging logistics | Use for legacy BOM continuity where SMB footprint is already allocated |
Compared with 1SMA30AT3, SMBJ30A offers higher surge endurance in thermally constrained layouts, while P6SMB30A provides footprint-compatible drop-in replacement with identical electrical behavior but alternate packaging and traceability.
Availability
1SMA30AT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O protection, and medical equipment power supply input requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA30AT3 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 1SMAxxAT3 series was developed specifically for cost-sensitive, high-reliability transient suppression in surface-mount power and signal line protection across automotive, industrial, and medical systems.
FAQ
What is the maximum clamping voltage of the 1SMA30AT3 under rated surge conditions?
The 1SMA30AT3 clamps to a maximum of 48.4 V when subjected to its rated 48.4 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This value is specified in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet for the 1SMA5.0AT3 Series. Designers must ensure this clamped voltage remains below the absolute maximum rating of downstream components protected by the 1SMA30AT3.
Is the 1SMA30AT3 suitable for bidirectional transient suppression?
No, the 1SMA30AT3 is a unidirectional TVS diode and conducts only during reverse-biased overvoltage events. For bidirectional protection, ON Semiconductor specifies separate parts such as the 1SMA30CAT3. Using the 1SMA30AT3 in AC-coupled or bipolar signal paths will not provide clamping during positive-going transients beyond the forward voltage drop (~3.5 V), making it unsuitable for true bidirectional applications.
What is the thermal resistance from junction to ambient (RJA) for the 1SMA30AT3?
The 1SMA30AT3 has a thermal resistance from junction to ambient (RJA) of 250 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This value assumes zero airflow and standard PCB copper area. Derating begins at 25°C ambient, with power dissipation reduced by 4.0 mW/°C above that temperature, limiting continuous DC power to 0.5 W at 25°C.
Does the 1SMA30AT3 meet lead-free soldering requirements?
Yes, the 1SMA30AT3 is available in a Pb-free version designated as 1SMA30AT3G, which complies with RoHS and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The standard 1SMA30AT3 may contain lead; always verify the suffix and packaging code when ordering for lead-free manufacturing processes.
How does the 1SMA30AT3 compare to the 1N6267A in terms of surge capability?
The 1SMA30AT3 delivers 400 W peak pulse power at 1 ms, matching the 1N6267A's rating, but uses the smaller SMA (DO-214AC) package versus the DO-201AD package of the 1N6267A. While both share similar VRWM (30 V) and VC (48.4 V), the 1SMA30AT3 offers superior board-space efficiency and automated assembly compatibility, whereas the 1N6267A provides higher thermal mass for rare high-duty-cycle surge scenarios.
1SMA30AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
1SMA30AT3 FAQ
1.How can I place an order for 1SMA30AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA30AT3 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 1SMA30AT3 reliable?
The price and inventory of 1SMA30AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA30AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA30AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA30AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA30AT3?
1SMA30AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA30AT3 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 1SMA30AT3?
For technical support, including 1SMA30AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA30AT3 requirements.
6.How does Aetrix verify that 1SMA30AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA30AT3 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 1SMA30AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA30AT3?
All 1SMA30AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA30AT3, 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 1SMA30AT3 part is unused and in its original packaging.
Return procedure for 1SMA30AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA30AT3 Tags
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