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onsemi SMF51AT1G
- Part No.:
- SMF51AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF51AT1G.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:8,204
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Product details
Overview
SMF51AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed for clamping ESD and surge transients on DC power rails and signal lines. It features a 51 V working peak reverse voltage (VRWM), 59.7 V minimum breakdown voltage (VBR), 62.7 V maximum clamping voltage (VC) at 82.4 A peak pulse current (IPP), and <1 ns response time - enabling robust protection in compact portable electronics.
For engineers reviewing the SMF51AT1G datasheet, pinout, applications, or equivalent options, this device is selected for its precise 51 V standoff rating, low-profile 1.0 mm height, Pb-free SOD-123FL footprint, and IEC61000-4-2 Level 4 (±16 kV HBM) ESD compliance in space-constrained power rail protection designs.
Technical Context
The SMF51AT1G operates as a unidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transient overvoltages above its VRWM of 51 V. Its low zener impedance ensures stable clamping during 8/20 µs surges up to 82.4 A, while maintaining ≤1 ns response time for fast-rising ESD events.
It delivers 200 W peak pulse power (10/1000 µs waveform), supports continuous operation from –55 °C to +150 °C, and exhibits ≤1 µA reverse leakage at VRWM - making it suitable for high-reliability DC input protection where thermal stability and low standby loss are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 51 V - sets minimum operating voltage threshold before clamping begins; matches 48 V nominal bus systems. |
| Breakdown Voltage (VBR) Min/Max | 59.7 V / 62.7 V @ 1 mA - defines tight voltage tolerance window for predictable turn-on behavior. |
| Maximum Clamping Voltage (VC) | 62.7 V @ 82.4 A - limits downstream voltage stress during worst-case 10/1000 µs surge. |
| Peak Pulse Power (Ppk) | 200 W @ 10/1000 µs - sustains high-energy transients without failure under standard test conditions. |
| Response Time | <1 ns - ensures suppression activates before sensitive ICs experience damaging overvoltage. |
| ESD Rating (HBM) | Class 3 (>16 kV) - meets IEC61000-4-2 Level 4 for direct human-contact interface protection. |
| Leakage Current (IR) | ≤1 µA @ 51 V - minimizes quiescent power loss in always-on power rail applications. |
Pinout & Package
SOD-123FL surface-mount package: 2-terminal, low-profile (max height 1.0 mm), 8.45 mm² footprint, cathode indicated by polarity band. RoHS-compliant, Pb-free matte tin lead finish, MSL 1 rated for 260 °C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient Clamp Output | Connected to protected line; sinks surge current to ground when voltage exceeds VRWM. |
| 2 (Anode) | Reference / Ground Return | Tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional Zener Clamping | Enables precise overvoltage protection on positive-rail-only paths without reverse conduction. |
| Low-Profile SOD-123FL Package | 1.0 mm max height allows integration into ultra-thin handheld devices and dense PCB layouts. |
| IEC61000-4-2 Level 4 Compliance | Guarantees survivability against ±16 kV contact discharge in end-product ESD validation testing. |
| 82.4 A Peak Pulse Current (IPP) | Supports robust protection against industrial-grade 10/1000 µs surges per IEC61000-4-4. |
| Pb-Free & RoHS-Compliant Construction | Meets global environmental regulations with 100% matte Sn lead finish and UL94 V-0 epoxy molding compound. |
Applications
| Industrial Power Input Protection | USB Port ESD Protection |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controllers exposed to load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary transient clamp on main power rail, placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤62.7 V during 82.4 A surges, preventing latch-up or permanent damage to downstream regulators and FPGAs. |
Use Scenario: VBUS line of USB 2.0 host ports in medical diagnostic handhelds subject to frequent operator ESD events. IC Role / Device Role / Timing Role: First-line ESD suppressor between connector and USB controller IC, operating in unidirectional mode. Use Value: Clamps ±16 kV HBM discharges within <1 ns, preserving signal integrity and avoiding USB enumeration failures. |
| Automotive Body Control Module | Point-of-Load DC-DC Converter Input |
Use Scenario: 12 V supply rail in BCM modules interfacing with LIN bus and sensor inputs in passenger compartments. IC Role / Device Role / Timing Role: Standoff-rated TVS protecting MCU I/O and CAN transceiver power domains from battery line transients. Use Value: 51 V VRWM avoids false triggering during cold-crank (6.5–7 V) and load-dump (up to 40 V) events while clamping >51 V spikes. |
Use Scenario: Input filter stage of 3.3 V buck converter supplying FPGA core voltage in telecom baseband units. IC Role / Device Role / Timing Role: Secondary surge limiter after bulk capacitor, guarding against board-level coupling transients. Use Value: Low 1 µA leakage prevents efficiency degradation at light loads; 200 W Ppk handles coupled 10/1000 µs surges from adjacent switching circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | Higher clamping voltage (69.4 V @ 58.1 A); SMA package (2.5 mm height vs. 1.0 mm). | Less suitable for ultra-low-profile designs; lower surge current rating reduces margin in high-energy environments. | Select SMAJ51A only if board height budget permits and surge energy is below 175 W. |
| 1.5SMC51A | Same VRWM and VBR, but DO-214AB package (4.5 mm height, 2x larger footprint); 200 W rating at 10/1000 µs. | Requires significant PCB area; not viable for portable or wearable form factors. | Choose 1.5SMC51A only when higher thermal mass is needed for repetitive surge duty cycles. |
Compared with SMAJ51A and 1.5SMC51A, the SMF51AT1G provides identical 51 V standoff and superior board-space efficiency via its 1.0 mm SOD-123FL package - making it the preferred choice for modern compact electronics requiring certified 16 kV ESD immunity without sacrificing layout density.
Availability
SMF51AT1G is available at Aetrix Electronics and suitable for industrial power input protection, USB port ESD hardening, automotive body control modules, point-of-load DC-DC converter inputs, and portable medical device power rails requiring stable component supply and full traceability.
Supply support for SMF51AT1G 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMF51AT1G belongs to onsemi's SMF5.0AT1 Series of unidirectional Zener TVS diodes, engineered specifically for space-constrained DC power line and interface protection with guaranteed IEC61000-4-2/4-4 compliance and low-profile SOD-123FL packaging.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF51AT1G?
The SMF51AT1G has a working peak reverse voltage (VRWM) of 51 V. This value defines the maximum continuous DC or peak AC voltage the device can withstand without entering breakdown. It is selected to align with 48 V nominal systems while providing margin against normal operating fluctuations - ensuring the SMF51AT1G remains non-conductive during steady-state operation and only activates during overvoltage transients.
Does the SMF51AT1G meet IEC61000-4-2 ESD requirements?
Yes, the SMF51AT1G is rated for Class 3 ESD protection (>16 kV) per the Human Body Model and complies with IEC61000-4-2 Level 4. This certification is verified through standardized testing and confirms that the SMF51AT1G reliably clamps electrostatic discharges up to ±16 kV contact discharge - a key requirement for USB, HDMI, and other user-accessible interfaces in commercial and medical devices.
What is the maximum clamping voltage (VC) of the SMF51AT1G at its rated peak pulse current?
The SMF51AT1G has a maximum clamping voltage (VC) of 62.7 V at its rated peak pulse current (IPP) of 82.4 A, measured using the 10/1000 µs waveform. This VC value represents the upper limit of voltage imposed on the protected circuit during worst-case surge events - directly determining whether downstream components like DC-DC controllers or microcontrollers remain within their absolute maximum ratings.
Is the SMF51AT1G unidirectional or bidirectional, and how does that affect its use?
The SMF51AT1G is a unidirectional TVS diode, meaning it conducts only when the cathode is driven positive relative to the anode - protecting against positive-going transients on grounded-return systems. This configuration avoids leakage during negative excursions and is ideal for DC power rail protection where polarity is fixed, unlike bidirectional devices used on AC or differential signal lines.
What package type and dimensions does the SMF51AT1G use?
The SMF51AT1G uses the SOD-123FL (Case 498) surface-mount package: 2-terminal, flat-lead construction with maximum height of 1.0 mm, footprint area of 8.45 mm², and cathode indicated by a polarity band. Its compact size and low profile make the SMF51AT1G especially suitable for portable electronics, wearables, and high-density PCBs where vertical clearance and board space are constrained.
SMF51AT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOD-123F
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123FL
SMF51AT1G FAQ
1.How can I place an order for SMF51AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51AT1G 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 SMF51AT1G reliable?
The price and inventory of SMF51AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF51AT1G is usually 5 days.
3.What payment methods are accepted for SMF51AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51AT1G?
SMF51AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51AT1G 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 SMF51AT1G?
For technical support, including SMF51AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51AT1G requirements.
6.How does Aetrix verify that SMF51AT1G is sourced from the original manufacturer or authorized distributors?
All SMF51AT1G 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 SMF51AT1G meets industry standards.
7.What is the process for return or replacement of SMF51AT1G?
All SMF51AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF51AT1G, 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 SMF51AT1G part is unused and in its original packaging.
Return procedure for SMF51AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51AT1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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