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onsemi SMF90AT1
- Part No.:
- SMF90AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF90AT1.pdf
- Description:
- TVS DIODE 90VWM 146VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:4,163
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Product details
Overview
SMF90AT1 from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD−123FL package, designed for overvoltage protection of DC power rails and signal lines. It features a 90 V working peak reverse voltage (VRWM), 146 A maximum peak pulse current (IPP), 111 V maximum clamping voltage (VC) at IPP, <1 ns response time, and 175 W peak pulse power rating (10/1000 µs waveform). It is used in industrial power supplies and telecom interface circuits requiring robust ESD and surge immunity.
For engineers reviewing the SMF90AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, VC vs. protected IC's absolute maximum rating, IPP capability under IEC 61000−4−4 40 A surge, and thermal performance in SOD−123FL footprint with FR-4 PCB layout.
Technical Context
The SMF90AT1 operates as a unidirectional avalanche diode, conducting only in reverse breakdown when transient voltage exceeds its VRWM of 90 V. Its clamping action limits voltage to ≤111 V at 146 A peak pulse current (10/1000 µs), with low zener impedance ensuring minimal overshoot during fast transients.
It delivers Class 3 HBM ESD immunity (>16 kV), meets IEC 61000−4−2 Level 4 and IEC 61000−4−4 (40 A) requirements, and maintains stable leakage (<1 µA at VRWM) across −55°C to +150°C operating range. Thermal resistance RθJA is 325°C/W on recommended FR-4 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VC @ IPP | 111 V max at 146 A - Clamped voltage seen by downstream ICs during 10/1000 µs surge; determines safe margin below IC's absolute max rating. |
| IPP | 146 A - Peak surge current the device safely handles per IEC 61000−4−4 40 A test waveform with derating. |
| Response Time | <1 ns - Enables suppression of nanosecond-scale ESD events before sensitive circuitry is damaged. |
| Leakage @ VRWM | <1 µA - Negligible standby power loss and no measurable loading on 90 V bias rails. |
| ESD Rating | >16 kV HBM - Complies with IEC 61000−4−2 Level 4; protects against human-body discharge without degradation. |
| Package | SOD−123FL - Surface-mount flat-lead package (3.4–3.8 mm × 1.5–1.8 mm × ≤1.0 mm height); compatible with standard reflow profiles (MSL 1, 260°C). |
Pinout & Package
SOD−123FL is a 2-terminal surface-mount package with cathode indicated by a polarity band. The device has no internal circuitry beyond the Zener junction; terminals are electrically asymmetric and polarity-sensitive in circuit placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side connection to protected line | Connected to the rail or signal being protected; carries full surge current into ground path during clamping. |
| 2 (Anode) | Ground reference terminal | Must be tied to low-impedance system ground; voltage drop here directly adds to clamping voltage seen by load. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL package | Max height 1.0 mm - Enables use in space-constrained portable and telecom modules where board clearance is limited. |
| 175 W peak pulse power (10/1000 µs) | Rated for high-energy surges in industrial power inputs and PoE interfaces without thermal runaway. |
| IEC 61000−4−4 compliant (40 A) | Validated for repetitive 40 A surge testing - ensures long-term reliability in harsh electromagnetic environments. |
| Cathode band polarity marking | Unambiguous orientation on tape-and-reel and PCB - prevents assembly errors in high-volume SMT production. |
| MSL 1 moisture sensitivity | No dry-pack or baking required before reflow - reduces manufacturing overhead and avoids moisture-induced popcorning. |
Applications
| Industrial Power Supply Input Protection | Telecom Ethernet Port Surge Suppression |
|---|---|
Use Scenario: 90 V DC input rail in DIN-rail mounted PLC power module exposed to lightning-induced surges on 24–96 V distribution lines. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients before they reach DC/DC converter ICs. Use Value: Limits voltage to ≤111 V during 40 A IEC 61000−4−4 surge, protecting 120 V-rated input capacitors and controller ICs with 100 V abs max rating. |
Use Scenario: 48 V phantom power line in VoIP phone Ethernet port subjected to ESD and induced surges per IEC 61000−4−2/−4. IC Role / Device Role / Timing Role: Primary-level TVS on PSE-side PHY interface, shunting energy before magnetics and PHY transceiver. Use Value: Sub-1 ns response captures ESD events before PHY's internal protection activates; 1 µA leakage avoids phantom power regulation drift. |
| Automotive Body Control Module (BCM) Sensor Interface | Medical Equipment DC Bus Overvoltage Clamp |
Use Scenario: 12 V sensor supply line in BCM exposed to load-dump transients up to 120 V during alternator regulation failure. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary TVS or fuse, providing precise clamping near microcontroller ADC input rails. Use Value: 90 V VRWM allows 20% margin above nominal 12 V, while 111 V VC stays below 120 V MCU IO tolerance - avoids latch-up or damage. |
Use Scenario: 80–100 V DC bus in portable ultrasound battery charger subjected to accidental 120 VAC misconnection. IC Role / Device Role / Timing Role: Final-clamp TVS across bus capacitor to prevent overvoltage propagation to analog front-end and FPGA power domains. Use Value: 175 W peak power rating sustains multiple 10/1000 µs surges without degradation; SOD−123FL footprint fits tight medical PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | Same VRWM (90 V) and VC (111 V), but SMA package (larger footprint, 400 mW steady-state PD vs. 385 mW) | Higher thermal mass supports longer surge duration; less suitable for ultra-thin handheld designs | Choose SMAJ90A if board space allows and higher steady-state power dissipation is needed. |
| 1.5SMC90A | Same VRWM and VC, but DO-214AB package (7.0 × 6.2 mm), 1500 W peak power (10/1000 µs), 1.5 kW rating | Designed for high-energy industrial mains protection; over-specified for low-power signal lines | Choose 1.5SMC90A only when >1 kW surge handling is required and PCB area permits larger package. |
Compared with SMAJ90A and 1.5SMC90A, the SMF90AT1 offers optimal balance of compact SOD−123FL size, 175 W surge capability, and compatibility with fine-pitch automated assembly - making it preferred for space-limited, medium-energy protection in telecom and industrial edge devices.
Availability
SMF90AT1 is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface protection, automotive sensor conditioning, and medical DC bus clamping requiring stable component supply and full traceability.
Supply support for SMF90AT1 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, sensors, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The SMF5.0AT1 Series was developed to deliver high-surge-capability TVS protection in ultra-compact surface-mount packages for next-generation portable, telecom, and industrial control systems demanding reliability and miniaturization.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF90AT1?
The SMF90AT1 has a VRWM of 90 V, meaning it remains non-conductive up to this DC or peak AC voltage level. This value is critical for selecting appropriate overvoltage margin - for example, it suits 72–85 V nominal DC systems where 20% headroom is required before clamping initiates. The SMF90AT1 will not conduct significantly until voltage exceeds 90 V.
How does the SMF90AT1 compare to bidirectional TVS diodes in surge protection?
The SMF90AT1 is unidirectional and optimized for DC rail protection where polarity is fixed, offering lower leakage (<1 µA) and tighter clamping than bidirectional equivalents. Unlike bidirectional TVS diodes, the SMF90AT1 cannot protect AC signals or floating lines - it must be installed with correct anode-to-ground orientation. For 90 V DC applications like telecom power feeds, the SMF90AT1 provides superior efficiency and noise immunity.
What is the maximum clamping voltage (VC) of the SMF90AT1 under surge conditions?
The SMF90AT1 has a maximum clamping voltage (VC) of 111 V when subjected to its rated peak pulse current of 146 A (10/1000 µs waveform). This VC value defines the highest voltage that downstream components will experience during a surge event. Designers must ensure that all protected ICs have absolute maximum voltage ratings exceeding 111 V to avoid damage - for instance, pairing SMF90AT1 with 120 V-rated power MOSFETs or regulators.
Is the SMF90AT1 suitable for IEC 61000−4−4 (electrical fast transient) compliance testing?
Yes, the SMF90AT1 is explicitly rated for IEC 61000−4−4 Level 4 (40 A) surge immunity per its datasheet. Its 175 W peak pulse power rating (10/1000 µs) and sub-1 ns response time enable reliable suppression of repetitive 5 kHz burst transients. When implemented with low-inductance PCB layout and proper grounding, the SMF90AT1 helps systems pass full IEC 61000−4−4 testing without additional protection stages.
What is the thermal resistance (RθJA) of the SMF90AT1 in standard mounting conditions?
The SMF90AT1 has a thermal resistance RθJA of 325°C/W when mounted on the recommended minimum pad layout on FR-4 PCB, per its datasheet. This value assumes a specific copper footprint (as defined in onsemi's SOD−123FL layout guide) and ambient temperature of 25°C. At higher ambient temperatures or with reduced copper area, derating is required - for example, at 85°C ambient, its usable power dissipation drops to ~200 mW.
SMF90AT1 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- 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
SMF90AT1 FAQ
1.How can I place an order for SMF90AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF90AT1 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 SMF90AT1 reliable?
The price and inventory of SMF90AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF90AT1 is usually 5 days.
3.What payment methods are accepted for SMF90AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF90AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF90AT1?
SMF90AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF90AT1 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 SMF90AT1?
For technical support, including SMF90AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF90AT1 requirements.
6.How does Aetrix verify that SMF90AT1 is sourced from the original manufacturer or authorized distributors?
All SMF90AT1 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 SMF90AT1 meets industry standards.
7.What is the process for return or replacement of SMF90AT1?
All SMF90AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF90AT1, 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 SMF90AT1 part is unused and in its original packaging.
Return procedure for SMF90AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF90AT1 Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
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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