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onsemi SMF64AT1G
- Part No.:
- SMF64AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF64AT1G.pdf
- Description:
- TVS DIODE 64VWM 103VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:3,848
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Product details
Overview
SMF64AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed for clamping high-energy ESD and surge transients. It features 64 V working peak reverse voltage (VRWM), 78.6 V maximum clamping voltage (VC) at 103 A peak pulse current (IPP), and <1 ns response time - enabling robust protection of USB ports, power rails, and I/O lines in portable electronics.
For engineers reviewing the SMF64AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, VC vs. IC interface tolerance, IEC61000-4-2 Level 4 compliance, and SOD-123FL footprint compatibility with space-constrained PCB layouts.
Technical Context
The SMF64AT1G operates as a unidirectional avalanche breakdown device, triggered when reverse voltage exceeds its 71.1–78.6 V breakdown range (VBR). Its low zener impedance and fast sub-nanosecond response enable effective suppression of 10/1000 µs surges up to 175 W peak power and 40 A IEC61000-4-4 transients.
Designed for surface-mount use with Pb-free matte tin leads, it meets MSL 1 reflow requirements (260°C), supports cathode-band polarity identification, and delivers <1 µA leakage at 64 V VRWM - critical for low-power battery-operated systems where standby current integrity matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - must be ≥ circuit's max continuous DC/peak AC operating voltage to avoid false triggering |
| VBR (min/typ/max) | 71.1 / 74.85 / 78.6 V - defines reliable conduction onset under transient stress |
| VC @ IPP | 78.6 V max at 103 A - ensures protected IC sees no more than this voltage during worst-case surge |
| IPP | 103 A - peak pulse current capability per 10/1000 µs waveform, defining surge energy handling |
| Leakage @ VRWM | 1 µA max - preserves battery life and signal integrity in always-on sensing nodes |
| Response Time | <1 ns - faster than most microcontroller I/O pin ESD structures, enabling upstream protection |
| ESD Rating | Class 3 HBM (>16 kV), IEC61000-4-2 Level 4 (±8 kV contact / ±15 kV air) - certified system-level immunity |
Pinout & Package
SOD-123FL (Case 498) surface-mount package: 2.7 mm × 1.65 mm footprint, 1.0 mm max height, matte Sn-plated leads, cathode indicated by band. Compliant with JEDEC MO-203AA, RoHS and Pb-free standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line (e.g., USB D+); clamps to ground when transient exceeds VRWM |
| 2 (Non-banded End) | Anode | Connected to system ground reference; completes conduction path during avalanche breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123FL package | 1.0 mm max height enables use in ultra-thin mobile devices and stacked PCB assemblies |
| 175 W peak pulse power (10/1000 µs) | Handles automotive load-dump surges and industrial 40 A IEC61000-4-4 bursts without failure |
| IEC61000-4-2 Level 4 certified | Validated to withstand ±8 kV contact and ±15 kV air discharge - eliminates need for external ESD testing |
| 1 µA max IR @ VRWM | Minimizes quiescent current drain in battery-backed real-time clocks and sensor nodes |
| Pb-free matte tin lead finish | Enables lead-free reflow assembly while maintaining solderability and intermetallic reliability |
Applications
| USB 2.0 Data Lines | DC Power Input Rails |
|---|---|
Use Scenario: Protecting USB D+/D− lines in smartphones and OTG accessories against ESD events during cable insertion. IC Role / Device Role / Timing Role: Unidirectional TVS placed between data line and ground, clamping transients before they reach USB transceiver PHY. Use Value: Prevents latch-up or damage to 3.3 V tolerant PHYs by limiting voltage to ≤78.6 V during 15 kV air-gap discharges. | Use Scenario: Safeguarding 5–24 V input rails in industrial PLC modules exposed to inductive switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry, coordinated with upstream fuse and downstream LDO. Use Value: Absorbs 175 W transient energy without degradation, maintaining rail stability during 10/1000 µs surges up to 103 A. |
| Automotive Body Control Modules | Portable Medical Sensors |
Use Scenario: Shielding LIN bus and switch inputs in door control units from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on each protected node, referenced to chassis ground with minimal trace inductance. Use Value: Survives repeated 175 W pulses per ISO 7637-2 Pulse 5a, ensuring functional safety compliance without derating. | Use Scenario: Guarding analog front-end inputs of wearable ECG monitors against hospital-grade ESD events. IC Role / Device Role / Timing Role: First-line defense on electrode input paths, placed before instrumentation amplifier with high-impedance bias network. Use Value: Adds <1 µA leakage and <0.5 pF capacitance at 32 V bias - preserving signal-to-noise ratio and DC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same VRWM (64 V) and VC (103 V), but SMA package (larger footprint, higher thermal mass) | Preferred where board space allows and higher 400 W peak power is needed | Select SMAJ64A only if surge duty cycle exceeds SMF64AT1G's 175 W rating or if manual rework is required |
| 1.5SMC64A | Higher 1500 W peak power, DO-214AB package, 100 V VC - less precise clamping | Suitable for primary-side AC/DC input protection, not fine-grained signal line protection | Choose 1.5SMC64A for bulk power stage clamping; avoid for data line protection due to higher VC and slower response |
Compared with SMAJ64A and 1.5SMC64A, the SMF64AT1G offers optimal balance of compact size, tight clamping (78.6 V), and certified ESD robustness - making it the preferred choice for space-limited, low-capacitance, high-reliability signal-line protection.
Availability
SMF64AT1G is available at Aetrix Electronics and suitable for USB interface protection, industrial power input conditioning, and automotive LIN bus safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMF64AT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMF64AT1G belongs to onsemi's SMF5.0AT1 Series of unidirectional TVS diodes - engineered specifically for high-surge, low-leakage, space-constrained transient suppression in portable and automotive electronics.
FAQ
What is the clamping voltage of the SMF64AT1G under maximum rated surge current?
The SMF64AT1G has a maximum clamping voltage (VC) of 78.6 V when subjected to its peak pulse current (IPP) of 103 A, measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected downstream ICs experience no more than 78.6 V during worst-case transient events, which is critical for safeguarding 3.3 V or 5 V logic interfaces. The SMF64AT1G maintains this performance across its full operating temperature range of −55 °C to +150 °C.
Is the SMF64AT1G suitable for protecting high-speed data lines like USB 2.0?
Yes, the SMF64AT1G is well-suited for USB 2.0 data line protection due to its low dynamic capacitance (<0.5 pF at 0 V, <0.3 pF at 32 V), sub-1 ns response time, and unidirectional configuration that avoids forward conduction during normal signaling. Its SOD-123FL footprint minimizes parasitic inductance, and its 78.6 V clamping voltage prevents damage to USB transceivers during ESD events. The SMF64AT1G is explicitly validated for IEC61000-4-2 Level 4, making it appropriate for certified end-equipment designs.
How does the SMF64AT1G differ from bidirectional TVS diodes?
The SMF64AT1G is unidirectional, meaning it conducts only during negative transients on the cathode (pin 1) relative to anode (pin 2), behaving like a Zener diode in reverse bias. Bidirectional variants (e.g., SMBJ64CA) conduct for both polarities - useful for AC lines or floating signals - but exhibit higher leakage and capacitance. The SMF64AT1G's unidirectional architecture delivers lower leakage (<1 µA at 64 V) and tighter clamping, making it ideal for DC-coupled, ground-referenced lines such as power rails or single-ended data buses where polarity is fixed.
What is the maximum operating temperature and thermal derating behavior of the SMF64AT1G?
The SMF64AT1G is rated for junction temperatures from −55 °C to +150 °C, with thermal resistance from junction to ambient (RJA) of 325 °C/W when mounted on FR-4 PCB with recommended minimum pad size. Its peak pulse power derates linearly above 25 °C ambient: at 85 °C, usable peak power drops to ~70% of the 175 W rating. This derating is documented in Figure 4 of the official datasheet, and the SMF64AT1G remains fully functional within its specified TJ range without parameter shift or reliability penalty.
Can the SMF64AT1G replace older SMF64A variants without layout changes?
Yes - the SMF64AT1G is a direct Pb-free replacement for the legacy SMF64A, sharing identical SOD-123FL package dimensions, pinout (cathode band on pin 1), electrical specifications (VRWM = 64 V, VBR = 71.1–78.6 V, VC = 78.6 V), and tape-and-reel packaging (3000 units/reel). The "G" suffix denotes the same matte tin lead finish and MSL 1 reflow profile. No PCB redesign, stencil update, or firmware change is required when migrating to SMF64AT1G, and it maintains full compatibility with existing assembly processes.
SMF64AT1G 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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
SMF64AT1G FAQ
1.How can I place an order for SMF64AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF64AT1G 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 SMF64AT1G reliable?
The price and inventory of SMF64AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF64AT1G is usually 5 days.
3.What payment methods are accepted for SMF64AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF64AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF64AT1G?
SMF64AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF64AT1G 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 SMF64AT1G?
For technical support, including SMF64AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF64AT1G requirements.
6.How does Aetrix verify that SMF64AT1G is sourced from the original manufacturer or authorized distributors?
All SMF64AT1G 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 SMF64AT1G meets industry standards.
7.What is the process for return or replacement of SMF64AT1G?
All SMF64AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF64AT1G, 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 SMF64AT1G part is unused and in its original packaging.
Return procedure for SMF64AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF64AT1G 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
-
D5V0L1B2WS-7
Diodes Incorporated
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