My Inquiry
My Account
onsemi SMF9.0AT1
- Part No.:
- SMF9.0AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF9.0AT1.pdf
- Description:
- TVS DIODE 9VWM 15.4VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF9.0AT1 from onsemi is a unidirectional transient voltage suppressor diode (TVS) designed for overvoltage protection of DC power rails and signal lines. It features a 9.0 V working peak reverse voltage (VRWM), 15.4 V maximum clamping voltage at 13.0 A peak pulse current, 200 W peak pulse power (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 industrial sensor interfaces.
For engineers reviewing the SMF9.0AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under IEC61000-4-4 40 A transients, thermal derating on FR-4 PCBs, and SOD−123FL footprint compatibility with high-density layouts.
Technical Context
The SMF9.0AT1 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold (10.0–11.1 V at 1 mA). Its low dynamic impedance ensures stable clamping during fast transients such as ESD or inductive switching spikes. The device is optimized for single-polarity suppression only - it does not conduct in forward bias beyond typical diode conduction (VF ≤ 1.25 V @ 200 mA).
Thermal performance is defined by RθJA = 325°C/W on standard FR-4 with minimum recommended pad size, limiting steady-state power dissipation to 385 mW at 25°C ambient. Pulse handling relies on junction thermal mass rather than package conduction, enabling 200 W peak power for 1 ms pulses without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0 V - Maximum continuous reverse voltage before significant leakage; must exceed system DC rail voltage (e.g., 5 V, 9 V, or 12 V supply) to avoid false triggering. |
| VBR (min/max) | 10.0 V / 11.1 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VRWM while staying below downstream IC absolute max ratings. |
| VC @ IPP | 15.4 V @ 13.0 A - Clamping voltage under 10/1000 µs surge defines worst-case overvoltage seen by protected ICs; critical for 16 V-tolerant interface ICs. |
| IPP | 13.0 A - Peak pulse current capability per IEC61000-4-5 waveform; determines survivability against 40 A IEC61000-4-4 repetitive surges after derating. |
| IR @ VRWM | 5 µA max - Low leakage preserves battery life in always-on circuits and avoids loading high-impedance sensor nodes. |
| Response Time | <1 ns - Enables protection of high-speed interfaces (e.g., USB 2.0, CAN FD) where transients propagate faster than µC interrupt latency. |
| ESD Rating | >16 kV HBM, IEC61000-4-2 Level 4 - Qualifies for end-equipment compliance in consumer handhelds and industrial field terminals. |
Pinout & Package
SOD−123FL surface-mount package: 2-pin, low-profile (max height 1.0 mm), footprint area 8.45 mm², cathode indicated by polarity band. Compatible with standard reflow profiles (MSL 1, peak 260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line (e.g., VBUS, RS-485 A); carries full surge current to ground during clamping event. |
| 2 (Anode) | Reference / Ground return | Must connect to low-inductance ground plane; trace inductance directly impacts clamping performance and overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects only reverse-polarity transients on positive-rail systems; avoids forward conduction losses in normal operation. |
| Low-profile SOD−123FL | Enables placement adjacent to connectors or IC pads without interfering with shield cans or stacked components. |
| 100% matte tin lead finish | Ensures solderability and RoHS compliance without post-soldering cleaning or whisker risk in long-life deployments. |
| IEC61000-4-4 rated | Validated for 40 A surge immunity (4 kV, 5/50 ns), supporting industrial control and automotive body electronics requirements. |
| Tape-and-reel packaging | 3,000 units per reel with cathode-to-sprocket-hole orientation enables automated pick-and-place with zero polarity misalignment. |
Applications
| USB 2.0 Data Line Protection | DC Power Input Stage |
|---|---|
Use Scenario: Protecting D+ and D− lines in portable USB peripherals against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: TVS diode placed immediately after USB connector, shunting ESD current to chassis ground before reaching USB transceiver. Use Value: Prevents latch-up or gate oxide damage in USB PHY ICs by clamping transients to ≤15.4 V within <1 ns - below 16 V absolute max rating of most USB controllers. |
Use Scenario: Safeguarding 9 V DC input of industrial sensors or IoT edge nodes against load dump or hot-plug surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, upstream of LDO or buck converter input capacitors. Use Value: Limits transient overvoltage to 15.4 V during 13 A surges, preserving input capacitor voltage rating and preventing upstream regulator shutdown or failure. |
| RS-485 Transceiver Interface | Automotive Body Control Module |
Use Scenario: Shielding half-duplex RS-485 bus lines (A/B) in factory automation equipment exposed to motor drive noise and lightning-induced surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on each differential line, referenced to common ground. Use Value: Maintains signal integrity by suppressing >1 kV transients to sub-16 V levels without adding capacitance (>100 pF) that would degrade 10 Mbps data rates. |
Use Scenario: Protecting LIN bus or switched 12 V supply inputs in automotive interior modules (e.g., mirror controls, seat adjusters) against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: First-line defense on low-voltage power inputs, compliant with ISO 7637-2 Pulse 1/2a/3a test profiles. Use Value: Survives 100 V/50 ms load dump pulses via thermal mass and 200 W peak power rating, eliminating need for bulkier DO-214AC alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A | Same VRWM (9.0 V) and VC (15.4 V), but SMA package (larger footprint, higher RθJA = 40°C/W, 400 W peak power) | Better thermal handling for sustained surges; unsuitable for ultra-thin or space-constrained designs | Select SMAJ9.0A only if board layout allows larger 2.5 × 4.5 mm footprint and requires >200 W pulse robustness. |
| 1.5SMC9.0A | Higher peak power (1500 W), DO-214AB package, same VRWM/VC, but 2.5× taller (2.3 mm) and 3× larger footprint | Used in AC mains or high-energy industrial drives where PCB real estate is less constrained | Choose 1.5SMC9.0A only when protecting against severe IEC61000-4-5 combination wave (6 kV/3 kA) events requiring higher energy absorption. |
Compared with SMAJ9.0A and 1.5SMC9.0A, the SMF9.0AT1 delivers identical electrical protection in a 60% smaller footprint and 50% lower profile - making it optimal for portable, wearable, and miniaturized industrial electronics where board space and height are critical constraints.
Availability
SMF9.0AT1 is available at Aetrix Electronics and suitable for USB interface protection, DC power input staging, and RS-485 transceiver safeguarding requiring stable component supply across high-mix, low-volume production runs.
Supply support for SMF9.0AT1 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 SMF5.0AT1 Series was developed to deliver high-surge-capable, low-profile TVS protection for space-constrained portable and industrial electronics - prioritizing fast response, low leakage, and standardized SOD−123FL manufacturability.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF9.0AT1?
The SMF9.0AT1 has a VRWM of 9.0 V, meaning it remains in high-impedance state up to this DC or continuous peak reverse voltage. This value is selected to match nominal 9 V supply rails while providing sufficient margin above typical operating voltages to prevent leakage-induced power loss or false triggering during normal operation. The SMF9.0AT1 maintains ≤5 µA leakage at exactly 9.0 V.
How does the SMF9.0AT1 compare to bidirectional TVS diodes in ESD protection?
The SMF9.0AT1 is unidirectional and only clamps reverse-polarity transients - it behaves as a standard diode in forward bias (VF ≤ 1.25 V @ 200 mA). Unlike bidirectional TVS devices, it does not protect against positive-going transients on grounded lines. For applications like USB data lines where both polarities matter, two SMF9.0AT1 devices (anode-to-ground and cathode-to-ground) may be used, but a dedicated bidirectional part like SMBJ9.0CA offers simpler implementation.
Can the SMF9.0AT1 be used on a 12 V automotive supply line?
No - the SMF9.0AT1 is not suitable for direct use on a 12 V automotive supply because its 9.0 V VRWM is below typical 12 V system voltage (which can reach 13.5–14.5 V during charging). Using it risks excessive leakage or premature clamping. For 12 V systems, select SMF13A (VRWM = 13 V) or SMF15A (VRWM = 15 V) to ensure reliable standby operation while maintaining adequate clamping margin.
What is the maximum clamping voltage of the SMF9.0AT1 under surge conditions?
The SMF9.0AT1 has a maximum clamping voltage (VC) of 15.4 V when subjected to its rated peak pulse current of 13.0 A (10/1000 µs waveform). This value represents the highest voltage that will appear across the protected line during worst-case surge events - a critical parameter for ensuring downstream ICs with 16 V absolute maximum ratings remain within safe operating limits.
Does the SMF9.0AT1 meet IEC61000-4-2 and IEC61000-4-4 standards?
Yes - the SMF9.0AT1 is explicitly rated for IEC61000-4-2 Level 4 ESD protection (>16 kV contact discharge) and IEC61000-4-4 electrical fast transient (EFT) immunity at 40 A. These certifications are validated per onsemi's characterization and are documented in the official SMF5.0AT1 Series datasheet Rev. 0, confirming suitability for CE-marked industrial and consumer end equipment.
SMF9.0AT1 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 13A
- 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
SMF9.0AT1 FAQ
1.How can I place an order for SMF9.0AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF9.0AT1 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 SMF9.0AT1 reliable?
The price and inventory of SMF9.0AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF9.0AT1 is usually 5 days.
3.What payment methods are accepted for SMF9.0AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF9.0AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF9.0AT1?
SMF9.0AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF9.0AT1 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 SMF9.0AT1?
For technical support, including SMF9.0AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF9.0AT1 requirements.
6.How does Aetrix verify that SMF9.0AT1 is sourced from the original manufacturer or authorized distributors?
All SMF9.0AT1 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 SMF9.0AT1 meets industry standards.
7.What is the process for return or replacement of SMF9.0AT1?
All SMF9.0AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF9.0AT1, 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 SMF9.0AT1 part is unused and in its original packaging.
Return procedure for SMF9.0AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF9.0AT1 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
