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onsemi SMF75AT1
- Part No.:
- SMF75AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF75AT1.pdf
- Description:
- TVS DIODE 75VWM 121VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
SMF75AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection 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 121 A peak pulse current (IPP), and 200 W peak pulse power rating per 10/1000 µs waveform. Used in power supplies, industrial controllers, and automotive body electronics to absorb ESD and lightning-induced surges.
For engineers reviewing the SMF75AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 121 A surge, low leakage (<1 µA @ 75 V), sub-1 ns response time, IEC61000-4-2 Level 4 ESD robustness (>16 kV HBM), and SOD−123FL package compatibility with high-density PCB layouts.
Technical Context
The SMF75AT1 operates as a Zener-based unidirectional TVS, conducting only in reverse breakdown above VRWM = 75 V. Its clamping behavior is defined by a sharp knee at VBR = 83.3–92.1 V (tested at IT = 1 mA), limiting transient energy dissipation across protected circuitry.
Thermal design relies on RθJA = 325°C/W (with recommended FR-4 pad), enabling 385 mW steady-state dissipation at 25°C ambient. Surge capability is validated per IEC61000-4-4 (40 A) and IEC61000-4-2 (±16 kV contact discharge), with junction temperature rated from −55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail voltage margin. |
| VBR (min/max) | 83.3 V / 92.1 V - Breakdown occurs within this range at 1 mA test current; defines turn-on consistency across production lots. |
| VC @ IPP | 92.1 V @ 121 A - Maximum clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| IR @ VRWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in battery-powered systems. |
| Response Time | <1 ns - Enables suppression of fast transients (e.g., ESD events) before sensitive logic or analog circuits are damaged. |
| ESD Rating | Class 3 HBM (>16 kV); IEC61000-4-2 Level 4 - Validated for direct human-body and system-level electrostatic discharge immunity. |
| Package | SOD−123FL - Surface-mount flat-lead package (3.4–3.8 mm × 1.5–1.8 mm × ≤1.0 mm height) optimized for automated assembly and thermal relief. |
Pinout & Package
SOD−123FL is a two-terminal surface-mount package with cathode indicated by a polarity band. Mounting orientation is unrestricted; qualified for reflow up to 260°C (MSL 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line (e.g., VBUS or signal trace); carries full surge current to ground reference during clamping. |
| 2 (Anode) | Reference/ground return path | Typically tied to system ground plane; must maintain low-inductance path to handle 121 A peak pulse without voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL footprint | 8.45 mm² area and ≤1.0 mm height enable placement in space-constrained portable and automotive modules. |
| High surge current handling | 121 A peak pulse current supports IEC61000-4-4 40 A surge testing with safety margin for real-world coupling paths. |
| Fast transient response | <1 ns reaction time prevents nanosecond-scale voltage spikes from propagating into microcontrollers or sensors. |
| Stable Zener clamping | Low dynamic impedance ensures predictable VC across temperature (−55°C to +150°C) and aging conditions. |
| Tape-and-reel packaging | 3,000 units per 8 mm tape reel supports high-volume SMT line efficiency and J-STD-020-compliant reflow profiles. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controller (PLC) power stage exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and chassis ground to clamp transients before DC/DC converter input. Use Value: Limits voltage to ≤92.1 V during 121 A surges, preventing damage to 36 V-rated input capacitors and MOSFET gate drivers. |
Use Scenario: LIN bus line in door module subjected to ESD events during window switch actuation and cable harness coupling. IC Role / Device Role / Timing Role: Signal-line TVS connected between LIN data line and local ground to shunt ESD current away from transceiver IC. Use Value: Sub-1 ns response and >16 kV HBM rating ensure reliable operation without data corruption or transceiver latch-up. |
| Consumer USB-C Power Delivery | Medical Diagnostic Equipment Interface |
Use Scenario: VBUS line in portable ultrasound charger dock experiencing hot-plug transients and cable ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 20 V PD output rail, upstream of buck regulator and battery charging IC. Use Value: 75 V VRWM matches 20 V nominal + 30% tolerance; 92.1 V VC protects 12 V-rated downstream regulators during 10/1000 µs surges. |
Use Scenario: RS-485 communication port in patient monitor connecting to external analyzers via unshielded cables in hospital EM environment. IC Role / Device Role / Timing Role: Line-end TVS on differential pair to suppress common-mode surges induced by nearby MRI or RF equipment. Use Value: Low capacitance (<100 pF @ 0 V) avoids signal integrity degradation at 10 Mbps RS-485 rates while meeting IEC61000-4-4 40 A requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | Higher 600 W peak power (10/1000 µs), SMB package (larger footprint: 4.5 × 3.9 mm vs. SOD−123FL's 3.6 × 1.65 mm), VRWM = 75 V identical. | Better suited for higher-energy surges in industrial motor drives where board space allows larger package. | Select SMBJ75A when surge energy exceeds 200 W rating and thermal mass from larger package improves reliability. |
| P6SMB75A | Same SMB package as SMBJ75A but lower 600 W rating, slightly higher VC (93.6 V @ 113 A), VRWM = 75 V. | Legacy alternative with broader distributor availability but less tight VBR distribution (±5% vs. SMF series ±2.5%). | Choose P6SMB75A only if SMB footprint is already committed and tighter clamping tolerance is not required. |
Compared with SMBJ75A and P6SMB75A, the SMF75AT1 delivers identical 75 V protection level in a 55% smaller footprint and 3× lower profile-critical for ultra-thin consumer and automotive modules-while maintaining full IEC61000-4-2/4-4 compliance at its rated 200 W surge level.
Availability
SMF75AT1 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, USB-C power delivery systems, and medical diagnostic interface designs requiring stable component supply and long-term lifecycle support.
Supply support for SMF75AT1 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, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The SMF75AT1 belongs to onsemi's SMF5.0AT1 Series of unidirectional TVS diodes, engineered specifically for compact, high-reliability overvoltage protection in space-constrained DC power and signal interfaces.
FAQ
What is the clamping voltage of SMF75AT1 at its rated peak pulse current?
The SMF75AT1 has a maximum clamping voltage (VC) of 92.1 V at 121 A peak pulse current (IPP), measured per the 10/1000 µs waveform. This value represents the worst-case voltage imposed on protected circuitry during a standardized surge event and is guaranteed across temperature and production lot variations.
Can SMF75AT1 be used for bidirectional transient suppression?
No, the SMF75AT1 is a unidirectional TVS diode and conducts only in reverse bias above VRWM = 75 V. For bidirectional protection (e.g., AC lines or differential signals), a symmetric device like SMAJ75A or dedicated dual-rail TVS array is required. Using SMF75AT1 in forward bias provides only standard diode conduction (~1.25 V drop), not clamping.
What is the maximum operating temperature range for SMF75AT1?
The SMF75AT1 is rated for an operating and storage temperature range of −55°C to +150°C. Its Zener clamping characteristics remain stable across this full range, with derating applied to steady-state power dissipation above 25°C ambient per the published RθJA = 325°C/W specification.
How does SMF75AT1 compare to SMAJ75A in terms of package size and surge rating?
The SMF75AT1 uses the SOD−123FL package (3.6 × 1.65 mm), while SMAJ75A uses the larger SMA package (4.5 × 2.7 mm). SMF75AT1 is rated for 200 W peak pulse power (10/1000 µs), whereas SMAJ75A supports 400 W. Both share identical VRWM = 75 V and similar VBR ranges, but SMAJ75A offers higher surge headroom at the cost of board area.
Is SMF75AT1 compliant with lead-free soldering standards?
Yes, the SMF75AT1 features 100% matte tin (Sn) lead finish and is qualified for lead-free reflow soldering up to 260°C for 10 seconds. It meets MSL Level 1 moisture sensitivity requirements and is compatible with standard J-STD-020 profiles, including preheat, soak, and peak temperature ramp rates.
SMF75AT1 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
SMF75AT1 FAQ
1.How can I place an order for SMF75AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF75AT1 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 SMF75AT1 reliable?
The price and inventory of SMF75AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF75AT1 is usually 5 days.
3.What payment methods are accepted for SMF75AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF75AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF75AT1?
SMF75AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF75AT1 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 SMF75AT1?
For technical support, including SMF75AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF75AT1 requirements.
6.How does Aetrix verify that SMF75AT1 is sourced from the original manufacturer or authorized distributors?
All SMF75AT1 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 SMF75AT1 meets industry standards.
7.What is the process for return or replacement of SMF75AT1?
All SMF75AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF75AT1, 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 SMF75AT1 part is unused and in its original packaging.
Return procedure for SMF75AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF75AT1 Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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