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onsemi SMF75AT1G
- Part No.:
- SMF75AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF75AT1G.pdf
- Description:
- TVS DIODE 75VWM 121VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:9,201
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Product details
Overview
SMF75AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed for clamping high-energy transients in DC power rails and signal lines. It features a 75 V working peak reverse voltage (VRWM), 92.1 V maximum clamping voltage (VC) at 1.4 A peak pulse current (IPP), and <1 ns response time - enabling robust ESD and surge protection in compact portable electronics.
For engineers reviewing the SMF75AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, VC vs. system tolerance, IEC61000-4-2/4-4 compliance, low-profile SOD-123FL footprint, and Pb-free tape-and-reel packaging for automated assembly.
Technical Context
The SMF75AT1G operates as a unidirectional avalanche breakdown device, triggered when reverse voltage exceeds its 83.3–92.1 V breakdown range (VBR). Its low zener impedance and fast sub-nanosecond response enable effective suppression of 8/20 µs surges up to 1.4 A and 10/1000 µs transients up to 121 A (derated per ambient temperature).
It meets IEC61000-4-2 Level 4 (±16 kV contact, ±30 kV air) and IEC61000-4-4 (40 A, 5/50 ns) immunity standards. The device is rated for -55°C to +150°C operation, with thermal resistance RθJA = 325°C/W on FR-4 board and RθJcathode = 26°C/W for enhanced power dissipation in high-density layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75 V - Minimum reverse standoff voltage before conduction; must exceed circuit's max continuous operating voltage. |
| VC @ IPP | 92.1 V max @ 1.4 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected IC. |
| PPK | 200 W @ 10/1000 µs - Peak pulse power handling; determines survivability against lightning-induced surges. |
| Response Time | <1 ns - Enables suppression before sensitive logic or analog circuits are damaged by fast transients. |
| ESD Rating | Class 3 HBM (>16 kV) - Meets industrial-grade electrostatic discharge immunity without external shielding. |
| Package | SOD-123FL - 2.7 × 1.6 mm footprint, 1.0 mm max height; compatible with fine-pitch PCB assembly and space-constrained designs. |
Pinout & Package
SOD-123FL surface-mount package with cathode indicated by polarity band; low-profile (max 1.0 mm height), void-free thermoset epoxy case meeting UL 94 V-0, matte tin lead finish, MSL 1 rated for 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line's higher potential side; clamps to ground when transient exceeds VRWM. |
| 2 (Non-banded End) | Anode | Typically tied to system ground or low-side reference; completes conduction path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low Clamping Ratio | VC/VRWM = 1.23 - Minimizes overvoltage stress on downstream components relative to operating rail. |
| Small Footprint Area | 8.45 mm² - Reduces PCB real estate use in multi-rail protection schemes (e.g., USB, HDMI, battery inputs). |
| Pb-Free & RoHS Compliant | 100% matte Sn finish - Ensures compatibility with lead-free reflow profiles and environmental compliance requirements. |
| Tape-and-Reel Packaging | 3,000 units/reel, 8 mm carrier - Optimized for high-speed pick-and-place assembly in volume manufacturing. |
Applications
| USB Power Input Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 5 V USB-powered peripherals from hot-plug transients and ESD events during field connection. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND to clamp overshoots before reaching USB controller or LDO. Use Value: With 75 V VRWM and 92.1 V VC, it avoids false triggering on normal 5.5 V max VBUS while limiting surge to safe levels for 5 V tolerant ICs. | Use Scenario: Safeguarding 24 V analog sensor outputs (e.g., 4–20 mA loops) against induced surges in factory automation environments. IC Role / Device Role / Timing Role: Reverse-biased across signal and return lines to shunt common-mode transients before entering ADC front-end. Use Value: 200 W peak power rating and 1.4 A IPP ensure survival of repetitive 1 kV/500 A surge pulses per IEC61000-4-4, maintaining signal integrity. |
| Portable Medical Device Battery Input | Automotive Infotainment Display Supply |
Use Scenario: Securing lithium-ion battery input (nominal 3.7 V, max 4.2 V) against accidental reverse polarity and load dump spikes. IC Role / Device Role / Timing Role: Placed anode-to-battery+, cathode-to-system ground to absorb positive transients and block reverse current. Use Value: Sub-1 ns response prevents latch-up in PMICs; 1.0 mm profile enables placement directly at connector entry point without height interference. | Use Scenario: Protecting 12 V display backlight drivers from alternator load dump transients in automotive infotainment head units. IC Role / Device Role / Timing Role: Mounted on main 12 V rail upstream of DC-DC converters to clamp 120 V/200 ms load dump events. Use Value: 200 W peak power and 121 A IPP capability (at 25°C) meet ISO 7637-2 Pulse 5a requirements when derated per ambient temperature curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Higher clamping voltage (121 V @ 1.2 A), larger SMA package (4.5 × 2.7 mm), 400 W peak power. | Better suited for higher-energy 12 V automotive systems; less suitable for space-constrained consumer devices. | Select SMAJ75A only if PCB layout allows larger footprint and system requires higher surge margin beyond 200 W. |
| P6SMB75A | Same 75 V VRWM but DO-214AA package (4.5 × 3.2 mm), 600 W peak power, higher thermal mass. | Preferred for industrial power supplies where board space is less constrained and long-term reliability under repeated surges is critical. | Choose P6SMB75A when thermal cycling endurance and >500 W transient handling outweigh size constraints. |
Compared with SMAJ75A and P6SMB75A, the SMF75AT1G delivers identical VRWM and superior board-area efficiency in SOD-123FL, making it optimal for portable, battery-powered, and high-density designs where clamping precision and minimal height (<1.0 mm) are prioritized over ultra-high surge capacity.
Availability
SMF75AT1G is available at Aetrix Electronics and suitable for USB power input protection, industrial sensor interface circuits, portable medical device battery inputs, and automotive infotainment display supply rails requiring stable component supply with full traceability and lifecycle management.
Supply support for SMF75AT1G 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 SMF5.0AT1 Series - including SMF75AT1G - belongs to onsemi's transient voltage suppressor product line, engineered specifically for compact, high-reliability overvoltage protection in space- and cost-sensitive electronic systems.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF75AT1G?
The SMF75AT1G has a VRWM of 75 V, meaning it remains non-conductive below this voltage and begins clamping when reverse voltage exceeds this threshold. This value ensures compatibility with 48 V and lower DC systems while providing sufficient margin above nominal rail voltages - for example, protecting a 24 V industrial bus where transients may reach 40–60 V. The SMF75AT1G's specified VRWM is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
How does the clamping voltage (VC) of the SMF75AT1G compare to its breakdown voltage (VBR)?
The SMF75AT1G exhibits a typical VBR range of 83.3–87.7 V at 1 mA test current, while its maximum clamping voltage VC is 92.1 V at 1.4 A peak pulse current. This 8–9 V difference reflects the dynamic impedance rise under high-current surge conditions - a key design parameter that determines how much overvoltage downstream components will experience. The SMF75AT1G's low VC ensures protected ICs remain within absolute maximum ratings during transient events.
Is the SMF75AT1G suitable for IEC61000-4-2 and IEC61000-4-4 compliance testing?
Yes, the SMF75AT1G is explicitly rated for IEC61000-4-2 Level 4 ESD protection (>16 kV contact, >30 kV air) and IEC61000-4-4 electrical fast transient (EFT) immunity (40 A, 5/50 ns). These certifications are documented in the Features section of the onsemi SMF5.0AT1 Series datasheet. When used with proper PCB layout (short traces, low-inductance grounding), the SMF75AT1G enables end equipment to pass both standards without additional protection stages.
What is the thermal resistance and power derating behavior of the SMF75AT1G?
The SMF75AT1G has a junction-to-ambient thermal resistance (RθJA) of 325°C/W on standard FR-4 board with recommended pad layout, and junction-to-cathode resistance (RθJcathode) of 26°C/W. Its peak pulse power drops from 200 W at 25°C to ~100 W at 100°C ambient, per the Figure 4 derating curve. This behavior must be accounted for in high-temperature environments like automotive cabins or enclosed industrial enclosures - the SMF75AT1G's performance envelope is fully defined in the Maximum Ratings table on page 2 of its datasheet.
Does the SMF75AT1G have a Pb-free construction and what is its moisture sensitivity level?
Yes, the "G" suffix in SMF75AT1G denotes a Pb-free package with 100% matte tin lead finish, compliant with RoHS Directive 2011/65/EU. It meets Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and withstand reflow soldering up to 260°C peak temperature without baking - simplifying manufacturing logistics for high-volume SMT lines.
SMF75AT1G 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 1.4A
- 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
SMF75AT1G FAQ
1.How can I place an order for SMF75AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF75AT1G 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 SMF75AT1G reliable?
The price and inventory of SMF75AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF75AT1G is usually 5 days.
3.What payment methods are accepted for SMF75AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF75AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF75AT1G?
SMF75AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF75AT1G 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 SMF75AT1G?
For technical support, including SMF75AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF75AT1G requirements.
6.How does Aetrix verify that SMF75AT1G is sourced from the original manufacturer or authorized distributors?
All SMF75AT1G 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 SMF75AT1G meets industry standards.
7.What is the process for return or replacement of SMF75AT1G?
All SMF75AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF75AT1G, 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 SMF75AT1G part is unused and in its original packaging.
Return procedure for SMF75AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF75AT1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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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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