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onsemi 1SMA54AT3G
- Part No.:
- 1SMA54AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA54AT3G.pdf
- Description:
- TVS DIODE 54VWM 87.1VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:117,000
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Product details
Overview
1SMA54AT3G 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 54 V working peak reverse voltage (VRWM), 63.15 V nominal breakdown voltage (VBR) at 1 mA, 87.1 V clamping voltage (VC) at 4.6 A peak pulse current, and <1 ns response time. It is used in automotive power supply protection, industrial PLC I/O modules, and medical equipment surge interfaces.
For engineers reviewing the 1SMA54AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. system operating voltage, clamping voltage headroom relative to protected IC absolute maximum ratings, junction capacitance (240 pF @ 0 V), and AEC−Q101 qualification status for automotive deployment.
Technical Context
The 1SMA54AT3G operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient energy above its VRWM of 54 V. Its 87.1 V clamping voltage at 4.6 A IPP ensures robust protection for 48 V nominal systems while maintaining safe margin below typical 100 V rail tolerances.
It exhibits low zener impedance and fast sub-nanosecond response, enabling effective suppression of ESD (Class 3 >16 kV HBM) and lightning-induced surges (10/1000 µs waveform). The device is rated for 400 W peak power at 1 ms, with thermal resistance RJA = 250 °C/W on FR-4 board using minimum footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 54 V - Maximum continuous reverse voltage before clamping begins; must exceed system DC operating voltage by ≥10% for reliable operation. |
| VBR (min/typ/max) | 60.0 / 63.15 / 66.3 V @ 1 mA - Confirms tight Zener tolerance band essential for predictable clamping threshold across temperature and lot variation. |
| VC @ IPP | 87.1 V @ 4.6 A - Clamping voltage under standardized 10/1000 µs surge; defines worst-case voltage seen by downstream circuitry during transient. |
| Peak Power | 400 W @ 1 ms - Energy-handling capability for single-event transients; derates linearly above 75°C ambient per Figure 3. |
| Junction Capacitance | 240 pF @ 0 V, 1 MHz - Impacts high-frequency signal integrity; suitable for DC/low-speed analog lines but not USB or CAN FD interfaces. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 Level 4 for system-level ESD immunity without external shielding. |
Pinout & Package
1SMA54AT3G is housed in an SMA (DO-214AC) surface-mount package (Case 403D), featuring a low-profile, flat-handling design optimized for automated placement and top/bottom PCB mounting. Cathode is marked by a molded polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Anode of internal Zener junction | Connected to higher-potential side of protected line; clamps when voltage exceeds VRWM relative to anode. |
| Anode | Cathode of internal Zener junction | Typically tied to ground or low-impedance return path; establishes reference for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise overvoltage protection on positive-rail systems without affecting reverse-bias leakage or signal polarity. |
| AEC−Q101 qualified | Validated for automotive underhood and body-control module applications requiring extended temperature range (−65°C to +150°C) and reliability testing. |
| SURMETIC® package | Void-free molded plastic construction ensures mechanical robustness, corrosion resistance, and consistent solderability at 260°C for 10 s. |
| Low profile & flat handling surface | Reduces tombstoning risk during reflow and supports accurate pick-and-place alignment in high-volume SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤87.1 V, preventing damage to downstream 100 V-rated MOSFETs and controllers. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated optocoupler input stage. Use Value: Absorbs 400 W surges without degradation, preserving input threshold accuracy and long-term channel reliability. |
| Medical Equipment Power Supply Interface | Telecom DC Power Distribution |
Use Scenario: Shielding auxiliary 12–24 V power supplies in diagnostic imaging devices from ESD and switching noise. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated output rails feeding sensitive analog front-ends. Use Value: Provides Class 3 HBM ESD immunity and <1 ns response to preserve signal fidelity in low-noise amplifiers. |
Use Scenario: Protecting -48 V telecom power distribution boards from hot-swap transients and lightning-induced surges. IC Role / Device Role / Timing Role: Bulk transient suppressor on main PSE feed before point-of-load regulators. Use Value: Handles repetitive 10/1000 µs surges up to 400 W, maintaining stable rail voltage during network maintenance events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA54AT3G | Identical electrical specs; AEC−Q101 certified with PPAP documentation and automotive-specific traceability controls. | Required for Tier-1 automotive designs where process control and change notification are mandated. | Select SZ1SMA54AT3G when full automotive qualification and supplier change management are contractually required. |
| SMCJ54A | Higher 1500 W peak power rating, larger SMC (DO-214AB) package, 93.6 V clamping voltage at 16.1 A IPP. | Better suited for high-energy industrial motor drives or solar inverter DC-link protection where 400 W is insufficient. | Choose SMCJ54A only if system-level surge testing exceeds IEC 61000-4-5 Level 4; otherwise, 1SMA54AT3G offers optimal size/power balance. |
Compared with SZ1SMA54AT3G, the 1SMA54AT3G lacks automotive PPAP documentation but shares identical Zener characteristics and package; versus SMCJ54A, it trades surge capacity for smaller footprint and lower parasitic capacitance-critical for space-constrained 48 V subsystems.
Availability
1SMA54AT3G is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O conditioning, and medical equipment power interface applications requiring stable component supply and long-term obsolescence management.
Supply support for 1SMA54AT3G 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 communications markets.
The 1SMA54AT3G belongs to ON Semiconductor's SMA-series unidirectional TVS family, engineered for cost-effective, high-reliability transient suppression in space-constrained DC power and signal line applications.
FAQ
What is the maximum clamping voltage of the 1SMA54AT3G under standard surge conditions?
The 1SMA54AT3G has a maximum clamping voltage (VC) of 87.1 V when subjected to a 10/1000 µs surge waveform at a peak pulse current (IPP) of 4.6 A. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The 1SMA54AT3G maintains this clamping performance across its specified operating temperature range of −65°C to +150°C.
Is the 1SMA54AT3G suitable for automotive applications?
Yes, the 1SMA54AT3G meets AEC−Q101 stress test requirements for reliability and is qualified for automotive use. While the base 1SMA54AT3G variant is qualified, the SZ1SMA54AT3G version adds PPAP documentation and enhanced site control for Tier-1 automotive programs. Both share identical electrical parameters, thermal performance, and package dimensions, making the 1SMA54AT3G appropriate for under-hood and body-control module designs.
What is the junction capacitance of the 1SMA54AT3G and how does it affect circuit design?
The 1SMA54AT3G exhibits a typical junction capacitance of 240 pF at 0 V bias and 1 MHz. This value impacts high-frequency signal paths: it is acceptable for DC power rails and low-speed digital or analog lines (e.g., RS-232, GPIO), but may cause unacceptable signal distortion or attenuation in high-speed interfaces like USB 2.0 or CAN FD. Designers should verify signal integrity margins when placing the 1SMA54AT3G near such traces.
How does the 1SMA54AT3G compare to bidirectional TVS diodes in surge protection?
The 1SMA54AT3G is unidirectional and optimized for clamping positive transients on grounded-return systems. Unlike bidirectional TVS diodes (e.g., 1SMA54CAT3G), it does not conduct during negative excursions beyond −1.5 V forward drop. This makes the 1SMA54AT3G ideal for single-polarity DC rails where reverse-voltage protection is unnecessary-and avoids unintended conduction that could disrupt bias networks or increase standby leakage in the 1SMA54AT3G application.
What is the thermal resistance and power derating behavior of the 1SMA54AT3G?
The 1SMA54AT3G has a junction-to-ambient thermal resistance (RJA) of 250 °C/W on a standard FR-4 board with ON Semiconductor's recommended minimum footprint. Its DC power dissipation is rated at 0.5 W at 25°C ambient, derating linearly by 4.0 mW/°C above that temperature. For pulsed operation, peak power remains at 400 W for 1 ms pulses at 25°C, with derating per Figure 3 in the datasheet-ensuring safe operation in thermally constrained 1SMA54AT3G deployments.
1SMA54AT3G 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 240pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA54AT3G FAQ
1.How can I place an order for 1SMA54AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA54AT3G 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 1SMA54AT3G reliable?
The price and inventory of 1SMA54AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA54AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA54AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA54AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA54AT3G?
1SMA54AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA54AT3G 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 1SMA54AT3G?
For technical support, including 1SMA54AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA54AT3G requirements.
6.How does Aetrix verify that 1SMA54AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA54AT3G 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 1SMA54AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA54AT3G?
All 1SMA54AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA54AT3G, 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 1SMA54AT3G part is unused and in its original packaging.
Return procedure for 1SMA54AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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