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onsemi SMF8.0AT1
- Part No.:
- SMF8.0AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF8.0AT1.pdf
- Description:
- TVS DIODE 8VWM 13.6VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:4,388
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Product details
Overview
SMF8.0AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 8.0 V working peak reverse voltage (VRWM), 13.6 V maximum clamping voltage at 14.7 A peak pulse current, 200 W peak pulse power rating (10/1000 µs), <1 ns response time, and IEC61000-4-2 Level 4 ESD immunity (>16 kV HBM). It is used in USB ports, DC input stages of portable electronics, and low-voltage microcontroller I/O protection.
For engineers reviewing the SMF8.0AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under IEC 61000-4-4 40 A transients, thermal derating on FR-4 PCBs, and SOD−123FL footprint compatibility with high-density layouts.
Technical Context
The SMF8.0AT1 operates as a Zener-based avalanche clamp, entering conduction when reverse voltage exceeds its 8.89–9.83 V breakdown range (VBR @ 1 mA). Its low dynamic impedance ensures stable clamping during fast transients such as ESD or inductive switching spikes.
It is rated for 200 W non-repetitive peak power (10/1000 µs waveform), with thermal resistance RθJA = 325 °C/W on recommended FR-4 pad layout. The device meets MSL 1 reflow requirements (260°C, 10 s max) and supports automated placement via 8 mm tape-and-reel packaging (3,000 units/reel).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; must be ≥ nominal rail voltage (e.g., 5 V or 8 V supply) |
| VBR (min/max) | 8.89 V / 9.83 V @ 1 mA - Confirmed breakdown threshold range; defines turn-on precision and tolerance stack-up margin |
| VC @ IPP | 13.6 V max @ 14.7 A - Clamped voltage seen by protected circuit during worst-case 10/1000 µs surge; determines downstream IC survivability |
| IPP | 14.7 A - Peak pulse current capability under standard 10/1000 µs waveform; correlates directly to IEC 61000-4-4 40 A system-level test margin |
| IR @ VRWM | 25 µA max - Reverse leakage at 8.0 V; ensures negligible standby power loss in battery-powered systems |
| Response Time | <1 ns - Enables effective suppression of sub-nanosecond ESD events per IEC61000-4-2 Class 3/4 |
| ESD Rating | >16 kV HBM - Validated human-body-model robustness; eliminates need for external ESD staging in many consumer interfaces |
Pinout & Package
SOD−123FL surface-mount package: 2-pin, flat-lead, cathode-indicated by polarity band; dimensions 2.50–2.90 mm × 1.50–1.80 mm × max 1.0 mm height; footprint area 8.45 mm²; RoHS-compliant matte tin lead finish; UL94 VO thermoset epoxy case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line (e.g., VBUS, signal); reverse-biased during normal operation; conducts during overvoltage |
| 2 (Non-banded End) | Anode | Connected to ground reference plane; establishes return path for surge current; requires low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL package | Max height 1.0 mm - Enables use in ultra-thin portable devices and tight board gaps without mechanical interference |
| IEC61000-4-2 Level 4 compliance | >16 kV contact discharge - Meets highest industrial/consumer ESD immunity requirement without additional protection layers |
| Fast response <1 ns | Sub-nanosecond turn-on - Captures leading edge of ESD pulses before downstream ICs experience overstress |
| 100% matte tin lead finish | Lead-free, RoHS-compliant, solderable with standard SnPb or SAC305 reflow profiles - Ensures manufacturing compatibility and reliability |
| MSL 1 rating | No dry-pack or baking required - Simplifies SMT line logistics and reduces handling cost for high-volume production |
Applications
| USB 2.0 Data Line Protection | DC Input Stage Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines in smartphone charging circuits against hot-plug transients and ESD. IC Role / Device Role: Unidirectional TVS placed between data line and chassis ground to shunt ESD energy away from USB transceiver. Use Value: Clamps to ≤13.6 V during 14.7 A surges, preserving USB PHY integrity while maintaining signal integrity below 480 Mbps. |
Use Scenario: Safeguarding 8 V DC input rails in IoT sensor nodes exposed to load-dump or inductive kickback. IC Role / Device Role: Primary overvoltage clamp on main power entry point, upstream of LDO or buck converter. Use Value: Absorbs 200 W transient energy without failure, preventing brownout or latch-up in downstream PMICs. |
| Microcontroller GPIO Protection | Automotive Body Control Module Inputs |
Use Scenario: Shielding 3.3 V or 5 V GPIO pins on ARM Cortex-M MCUs from accidental probe contact or cable discharge. IC Role / Device Role: Point-of-use TVS mounted directly at connector or header, with short trace to ground. Use Value: Limits pin voltage to 13.6 V during >16 kV HBM events, avoiding gate oxide rupture or latch-up in I/O cells. |
Use Scenario: Protecting LIN bus inputs or switch sense lines in 12 V automotive body modules against battery reversal and load dump. IC Role / Device Role: Secondary clamp after primary fuse/resistor network, providing final-stage surge hardening. Use Value: Withstands repeated 40 A IEC 61000-4-4 bursts while maintaining VRWM ≥ 8 V for 12 V nominal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A | Same VRWM (8.0 V), higher VC (12.0 V @ 17.1 A), SMA package (larger footprint, higher thermal mass) | Better power handling (400 W), but 50% larger board area; suited for industrial power supplies where space allows | Select SMAJ8.0A if surge duty cycle exceeds 1 pulse/minute or ambient temperature exceeds 85°C. |
| P6SMB8.0A | Same VRWM (8.0 V), lower IPP (15.2 A), higher VC (12.0 V), DO-214AA package (3.5 mm × 3.5 mm) | Higher surge rating (600 W), but slower response (~1.5 ns); better for slower transients like lightning-induced surges | Choose P6SMB8.0A for AC-coupled or high-energy surge environments where PCB space permits larger package. |
Compared with SMAJ8.0A and P6SMB8.0A, the SMF8.0AT1 offers optimal balance of compact size, nanosecond response, and 200 W surge capacity-making it preferred for space-constrained, high-speed digital interfaces rather than high-energy power-line protection.
Availability
SMF8.0AT1 is available at Aetrix Electronics and suitable for USB interface protection, DC input stage hardening, and microcontroller I/O safeguarding requiring stable component supply across high-mix, low-volume production runs and rapid prototyping cycles.
Supply support for SMF8.0AT1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMF series belongs to onsemi's transient voltage suppressor portfolio, engineered specifically for compact, high-reliability overvoltage protection in portable and space-constrained electronics with strict ESD and surge immunity requirements.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF8.0AT1?
The SMF8.0AT1 has a VRWM of 8.0 V, meaning it remains non-conductive up to this reverse voltage under steady-state conditions. This value is selected to match nominal 8 V supply rails or to provide margin above 5 V or 3.3 V systems while ensuring reliable clamping onset before downstream IC damage occurs. The SMF8.0AT1 datasheet confirms VRWM is guaranteed across temperature and lifetime.
How does the SMF8.0AT1 compare to the SMF5.0AT1 in terms of clamping performance?
The SMF8.0AT1 clamps at 13.6 V max under 14.7 A surge, whereas the SMF5.0AT1 clamps at 9.2 V max under 21.7 A. The higher VRWM of the SMF8.0AT1 results in higher VC but enables use on higher-voltage rails. Both share identical SOD−123FL package, <1 ns response, and IEC61000-4-2 Level 4 rating-making the SMF8.0AT1 the appropriate choice for 8 V systems where the SMF5.0AT1 would prematurely conduct.
Can the SMF8.0AT1 be used in bidirectional configurations?
No-the SMF8.0AT1 is a unidirectional TVS diode, optimized for DC rail or single-polarity signal line protection. Its asymmetrical Zener structure conducts only in reverse bias. For bidirectional protection (e.g., AC lines or differential pairs), a dedicated bidirectional part such as SMBJ8.0CA or two back-to-back SMF8.0AT1 devices would be required-not the SMF8.0AT1 alone.
What is the maximum allowable junction temperature for the SMF8.0AT1?
The SMF8.0AT1 has an operating junction temperature range of −55°C to +150°C. At 25°C ambient, its DC power dissipation is 385 mW with recommended FR-4 pad layout. Derating follows RθJA = 325 °C/W, so at 85°C ambient, usable DC power drops to ~200 mW. The SMF8.0AT1 must not exceed 150°C TJ even under transient conditions, as validated in onsemi's thermal characterization.
Is the SMF8.0AT1 compatible with lead-free reflow soldering processes?
Yes-the SMF8.0AT1 uses 100% matte tin lead finish and is qualified for MSL 1 handling, supporting peak reflow temperatures up to 260°C for ≤10 seconds without degradation. Its SOD−123FL package is fully compatible with standard lead-free (SAC305) reflow profiles, and no pre-baking is required. This makes the SMF8.0AT1 suitable for modern high-volume SMT assembly lines.
SMF8.0AT1 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 14.7A
- 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
SMF8.0AT1 FAQ
1.How can I place an order for SMF8.0AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF8.0AT1 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 SMF8.0AT1 reliable?
The price and inventory of SMF8.0AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF8.0AT1 is usually 5 days.
3.What payment methods are accepted for SMF8.0AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF8.0AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF8.0AT1?
SMF8.0AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF8.0AT1 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 SMF8.0AT1?
For technical support, including SMF8.0AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF8.0AT1 requirements.
6.How does Aetrix verify that SMF8.0AT1 is sourced from the original manufacturer or authorized distributors?
All SMF8.0AT1 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 SMF8.0AT1 meets industry standards.
7.What is the process for return or replacement of SMF8.0AT1?
All SMF8.0AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF8.0AT1, 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 SMF8.0AT1 part is unused and in its original packaging.
Return procedure for SMF8.0AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF8.0AT1 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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