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onsemi SMF90AT1G
- Part No.:
- SMF90AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF90AT1G.pdf
- Description:
- TVS DIODE 90VWM 146VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:3,208
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Product details
Overview
SMF90AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed for clamping high-energy ESD and surge transients in DC power rails and signal lines. It features a 90 V working peak reverse voltage (VRWM), 111 V maximum clamping voltage (VC) at 1.2 A peak pulse current (IPP), and <1 ns response time - enabling robust protection for 75–100 V industrial power supplies, PoE interfaces, and automotive body electronics.
For engineers reviewing the SMF90AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to load withstand rating, IEC61000-4-2/4-4 compliance, low-profile SOD-123FL footprint compatibility, and Pb-free reflow capability up to 260°C.
Technical Context
The SMF90AT1G operates as a unidirectional avalanche breakdown device, triggered when reverse voltage exceeds its 100–105.5 V breakdown range (VBR @ IT = 1 mA). Its low zener impedance and fast <1 ns response ensure minimal overvoltage overshoot during 8/20 µs or 10/1000 µs transients.
It delivers 175 W peak pulse power (per 10/1000 µs waveform) and meets IEC61000-4-2 Level 4 (±16 kV HBM, ±30 kV air) and IEC61000-4-4 (40 A, 5/50 ns) immunity standards - validated under TL = 30°C with 1 mA test current and 1.25 V forward voltage at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's max DC or peak AC voltage. |
| VBR (min/typ/max) | 100 / 105.5 / 111 V @ 1 mA - Ensures reliable turn-on above system operating voltage with margin against tolerance drift. |
| VC @ IPP | 111 V @ 1.2 A - Clamped voltage seen by protected circuit during worst-case 10/1000 µs surge; defines minimum safe withstand rating of downstream ICs. |
| Peak Pulse Power | 175 W @ 10/1000 µs - Sustains high-energy surges common in industrial power line and PoE injector environments. |
| Response Time | <1 ns - Limits voltage overshoot during ultrafast ESD events, critical for protecting sensitive analog front-ends and MCU I/O. |
| ESD Rating | Class 3 HBM (>16 kV); IEC61000-4-2 Level 4 - Validated protection against human-body and contact discharge per international immunity standards. |
| Package | SOD-123FL (Case 498) - 2.7 × 1.6 mm footprint, 1.0 mm max height; compatible with automated SMT assembly and IPC Class 3 reflow profiles. |
Pinout & Package
SOD-123FL surface-mount package with cathode indicated by polarity band; lead finish is 100% matte tin; qualified for MSL 1 and 260°C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line (e.g., VBUS, CAN_H); reverse-biased during normal operation; conducts during overvoltage event. |
| 2 (Non-banded End) | Anode | Connected to ground reference; establishes return path for surge current; requires low-inductance PCB layout to minimize clamping voltage rise. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123FL package | 1.0 mm max height enables use in space-constrained portable and automotive modules where board clearance is limited. |
| IEC61000-4-4 40 A surge capability | Withstands repetitive 40 A, 5/50 ns transients - suitable for industrial control inputs exposed to inductive switching noise. |
| Pb-free and RoHS-compliant | Meets global environmental regulations; matte Sn plating ensures solderability and eliminates lead-based contamination risk in medical/automotive BOMs. |
| 100% tested leakage current | IR ≤ 1 µA @ 90 V ensures negligible standby power loss in battery-powered systems and avoids false triggering in high-impedance sensing nodes. |
Applications
| Industrial Power Supply Input Protection | PoE (IEEE 802.3af/at) Data Line Clamp |
|---|---|
Use Scenario: Protecting 48–75 V DC input rails in programmable logic controllers (PLCs) and motor drives from lightning-induced surges and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: 111 V clamping voltage ensures downstream 100 V-rated input capacitors and MOSFETs remain within safe operating area during 1 kV/500 A surge events. |
Use Scenario: Safeguarding Ethernet PHY data pairs (e.g., TX+/TX−, RX+/RX−) in midspan PoE injectors and powered devices against cable discharge events. IC Role / Device Role / Timing Role: Bidirectionally unclamped (via paired SMF90AT1G devices) to absorb differential-mode ESD without distorting 100BASE-TX signaling integrity. Use Value: Sub-1 ns response preserves signal edge fidelity; 8.45 mm² footprint allows placement directly at RJ45 connector with minimal trace inductance. |
| Automotive Body Control Module (BCM) Power Rail | Smart Building Sensor Node Power Input |
Use Scenario: Securing 12 V–24 V supply inputs in BCMs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT rail, coordinated with upstream fuse and secondary LC filtering. Use Value: 175 W peak power rating sustains 100 ms load dump pulses; MSL 1 qualification supports automotive reflow and under-hood thermal cycling. |
Use Scenario: Protecting 24 V DC inputs of wireless sensor nodes (LoRaWAN, NB-IoT) deployed in HVAC ducts and lighting fixtures. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary power entry point to prevent latch-up or gate oxide damage in ultra-low-power MCUs and RF transceivers. Use Value: 1 µA max leakage at 90 V prevents measurable battery drain over 10-year deployments; Pb-free construction complies with EU building product directives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | Same VRWM (90 V), but SMA package (larger footprint, 4.5 × 2.7 mm); 400 W peak power (10/1000 µs); higher thermal resistance (RJA = 50°C/W). | Better suited for high-reliability industrial power supplies where board space permits larger package and higher surge handling is required. | Select SMAJ90A only if >200 W surge rating is mandatory and SOD-123FL size constraint does not apply. |
| 1.5SMC90A | DO-214AB package (7.1 × 6.2 mm); 1500 W peak power; VRWM = 90 V; higher clamping voltage (VC = 129 V @ 12.3 A). | Targeted at mains-connected equipment (IEC 61000-4-5) requiring higher energy absorption, not portable or space-limited designs. | Choose 1.5SMC90A for AC/DC front-end protection where PCB area and thermal mass support larger package and higher VC is acceptable. |
Compared with SMAJ90A and 1.5SMC90A, SMF90AT1G provides optimal balance of compact SOD-123FL footprint, 175 W surge capability, and tight 111 V clamping - making it preferred for space-constrained 24–90 V DC systems where layout inductance and thermal mass are limited.
Availability
SMF90AT1G is available at Aetrix Electronics and suitable for industrial power supplies, PoE infrastructure, automotive body electronics, and smart building sensor nodes requiring stable component supply across long-life production programs.
Supply support for SMF90AT1G 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 SMFxxAT1G series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for compact, high-reliability DC rail protection in portable, automotive, and industrial electronics where low profile and IEC-compliant surge immunity are essential.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF90AT1G?
The SMF90AT1G has a VRWM of 90 V, meaning it remains non-conductive under continuous reverse bias up to this voltage. This value is selected to exceed the maximum steady-state or peak operating voltage of the protected circuit - for example, in a 75 V industrial power rail - ensuring no leakage or premature conduction during normal operation while allowing headroom for tolerance and temperature drift.
Does the SMF90AT1G meet IEC61000-4-2 and IEC61000-4-4 standards?
Yes, the SMF90AT1G is 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 ratings are verified per the manufacturer's characterization and appear in the official datasheet - confirming its suitability for end-equipment requiring compliance with these key electromagnetic immunity standards.
What is the maximum clamping voltage (VC) of the SMF90AT1G and at what current is it specified?
The SMF90AT1G has a maximum clamping voltage (VC) of 111 V, measured at a peak pulse current (IPP) of 1.2 A using the 10/1000 µs waveform. This VC value defines the highest voltage that will appear across the protected line during a surge event - a critical parameter for ensuring downstream components (e.g., DC-DC controllers, interface ICs) remain within their absolute maximum voltage ratings.
Is the SMF90AT1G compatible with lead-free reflow soldering processes?
Yes, the SMF90AT1G uses 100% matte tin lead finish and is qualified for Pb-free reflow with a maximum peak temperature of 260°C. It meets MSL 1 (Moisture Sensitivity Level 1), meaning it can be stored indefinitely at ambient conditions without baking prior to assembly - simplifying manufacturing logistics for high-volume SMT lines.
How does the SOD-123FL package of the SMF90AT1G compare to larger TVS packages like SMA or DO-214AB?
The SOD-123FL package of the SMF90AT1G measures 2.7 × 1.6 mm with 1.0 mm max height - significantly smaller than SMA (4.5 × 2.7 mm) or DO-214AB (7.1 × 6.2 mm). While it delivers lower total surge energy (175 W vs. 400 W or 1500 W), its compact size enables placement directly at connectors or IC inputs, minimizing parasitic inductance and improving clamping effectiveness in high-speed or space-constrained designs.
SMF90AT1G 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
SMF90AT1G FAQ
1.How can I place an order for SMF90AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF90AT1G 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 SMF90AT1G reliable?
The price and inventory of SMF90AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF90AT1G is usually 5 days.
3.What payment methods are accepted for SMF90AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF90AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF90AT1G?
SMF90AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF90AT1G 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 SMF90AT1G?
For technical support, including SMF90AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF90AT1G requirements.
6.How does Aetrix verify that SMF90AT1G is sourced from the original manufacturer or authorized distributors?
All SMF90AT1G 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 SMF90AT1G meets industry standards.
7.What is the process for return or replacement of SMF90AT1G?
All SMF90AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF90AT1G, 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 SMF90AT1G part is unused and in its original packaging.
Return procedure for SMF90AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF90AT1G 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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