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Taiwan Semiconductor Corporation SMF11A
- Part No.:
- SMF11A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,130
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Product details
Overview
SMF11A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in low-voltage DC circuits. It features a 11 V working stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 18.2 V clamping voltage (VC) at 11 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is commonly used to protect USB ports, sensor interfaces, and microcontroller I/O lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMF11A datasheet, SMF11A pinout, SMF11A application, or SMF11A equivalent, key selection criteria include its SOD-123W package compatibility with automated placement, sub-1 µA reverse leakage at 11 V, 175 °C maximum junction temperature, and verified compliance with automotive transient immunity standards.
Technical Context
The SMF11A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transient overvoltages. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its thermal design supports 100 °C/W junction-to-ambient resistance on a standard 5 mm × 5 mm copper pad PCB layout.
It delivers precise clamping performance with a 18.2 V VC at 11 A (10/1000 µs), enabling robust protection of 3.3 V and 5 V logic rails without false triggering. The device meets ISO 7637-2 for automotive load-dump and inductive-switching immunity, and is rated for moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V nominal supply systems with margin. |
| VBR min/max | 12.2 V / 13.5 V @ 1 mA - Tight breakdown window ensures consistent turn-on across production lots. |
| VC @ IPPM | 18.2 V @ 11 A (10/1000 µs) - Clamps transients below 18.2 V during worst-case 200 W surge events. |
| IR @ VWM | < 1 µA - Negligible leakage at operating voltage, preserving battery life in always-on sensor nodes. |
| PPPM | 200 W - Peak pulse power rating defines maximum transient energy absorption capability. |
| TJ max | +175 °C - Enables operation in under-hood automotive or industrial environments without derating. |
| Package | SOD-123W - Standardized surface-mount outline with matte tin leads, compatible with reflow soldering and J-STD-002. |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode indicated by a band. The device has no internal circuitry beyond the single silicon die; polarity must be observed during PCB layout to ensure correct reverse-bias clamping operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; forms return path during clamping conduction. |
| Cathode | Protected line input | Connected to the signal or power line requiring transient suppression; conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling and humidity stress. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD/coupled noise). |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without floor-life constraints. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally restricted materials. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door-lock actuator drivers from load-dump and inductive kickback transients. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground to clamp negative-going pulses up to −100 V. Use Value: Prevents latch-up or permanent damage to transceivers during ISO 7637-2 Pulse 2b events, maintaining communication integrity. | Use Scenario: Safeguarding 4–20 mA current-loop analog inputs in PLC modules exposed to field wiring surges. IC Role / Device Role: Reverse-biased clamping element across loop terminals to limit voltage excursion during lightning-induced surges. Use Value: Limits terminal voltage to ≤18.2 V during 11 A transients, preserving ADC front-end and isolator integrity. |
| USB 2.0 Data Line Protection | Smart Meter Communication Port |
Use Scenario: ESD protection for D+ and D− lines in embedded USB host controllers per IEC 61000-4-2 Level 4 (±15 kV contact). IC Role / Device Role: Low-capacitance unidirectional TVS placed inline with each data line to ground. Use Value: Sub-1 µA leakage avoids signal degradation; 18.2 V clamping prevents PHY damage without disrupting 480 Mbps signaling. | Use Scenario: Transient suppression on RS-485 ports in utility smart meters subjected to meter-reading surges and grid coupling noise. IC Role / Device Role: Bidirectional-capable protection (via dual unidirectional configuration) on A/B differential lines. Use Value: With matched SMF11A pairs, maintains common-mode surge rejection while limiting differential overvoltage to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ11A | Same VWM (11 V), identical SOD-123 package, but higher VC = 18.7 V @ 11.3 A; slightly lower PPPM = 400 W (vs. 200 W for SMF11A). | Higher clamping voltage may reduce margin for 3.3 V logic protection; better suited for 12 V rail clamping where headroom is larger. | Select SMAJ11A if higher peak power handling is required and clamping voltage margin allows. |
| ON Semiconductor SMCJ11A | Different package (DO-214AB/SMB); larger footprint, higher PPPM = 1500 W, VC = 18.2 V @ 65.1 A; VWM = 11 V, VBR = 12.2–13.5 V. | Not drop-in replaceable due to SMB vs. SOD-123W size mismatch; intended for higher-energy industrial surge paths, not space-constrained PCBs. | Choose SMCJ11A only when board layout permits larger package and system-level surge energy exceeds 200 W. |
Compared with SMAJ11A and SMCJ11A, the SMF11A offers optimal balance of compact SOD-123W footprint, precise 11 V stand-off, and 18.2 V clamping-making it ideal for consumer, automotive, and industrial PCBs where space and consistency are critical.
Availability
SMF11A is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial sensor nodes, and USB peripheral protection requiring stable component supply and full traceability.
Supply support for SMF11A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 qualified product lines.
The SMF series is engineered specifically for surface-mount transient suppression in automotive, industrial, and communications equipment, emphasizing low leakage, tight VBR tolerance, and standardized SOD-123W packaging for high-volume automated assembly.
FAQ
What is the maximum clamping voltage of the SMF11A under a 10/1000 µs surge?
The SMF11A has a maximum clamping voltage (VC) of 18.2 V when subjected to an 11 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuitry during transient events. Designers use this parameter to verify that downstream ICs remain within their absolute maximum ratings during surge exposure. The SMF11A consistently achieves this clamping performance across its qualified production lot.
Is the SMF11A suitable for protecting 3.3 V logic circuits?
Yes, the SMF11A is appropriate for protecting 3.3 V logic circuits when used in conjunction with proper series impedance (e.g., current-limiting resistor or ferrite bead). Its 11 V working stand-off voltage ensures no conduction during normal operation, while its 18.2 V clamping voltage provides sufficient margin above the 3.3 V rail to prevent false triggering. However, designers must confirm that the protected IC's absolute maximum input voltage rating exceeds 18.2 V or implement additional filtering. The SMF11A itself does not regulate or limit steady-state voltage.
Does the SMF11A meet automotive transient immunity standards?
Yes, the SMF11A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (supply line switching transients), and Pulse 3a/3b (capacitive coupled fast transients). These qualifications are explicitly stated in Taiwan Semiconductor's official datasheet (Version D2103) and validated through standardized test waveforms. The SMF11A is widely deployed in automotive body control modules and infotainment systems where such immunity is mandatory. Its SOD-123W package also supports AEC-Q101 stress testing protocols.
What is the reverse leakage current specification for the SMF11A at its working voltage?
The SMF11A exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 11 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage preserves power efficiency in battery-powered or always-on applications such as IoT sensors and automotive standby circuits. The value is confirmed in the Electrical Specifications table of the official datasheet and reflects typical performance across production units-not a worst-case bound.
Can the SMF11A be used in bidirectional configurations?
No, the SMF11A is a unidirectional TVS diode and is not rated for bidirectional operation. It conducts only in reverse bias above its breakdown voltage and blocks forward current like a standard diode. For bidirectional protection (e.g., AC lines or differential buses), two SMF11A devices must be connected in series opposition-or a dedicated bidirectional TVS such as the SMBJ11CA should be selected. Using a single SMF11A in forward bias risks permanent damage due to excessive forward current beyond its 3.5 V @ 12 A rating.
SMF11A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 11A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF11A FAQ
1.How can I place an order for SMF11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF11A 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 SMF11A reliable?
The price and inventory of SMF11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF11A is usually 5 days.
3.What payment methods are accepted for SMF11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF11A?
SMF11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF11A 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 SMF11A?
For technical support, including SMF11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF11A requirements.
6.How does Aetrix verify that SMF11A is sourced from the original manufacturer or authorized distributors?
All SMF11A 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 SMF11A meets industry standards.
7.What is the process for return or replacement of SMF11A?
All SMF11A units undergo pre-shipment inspection (PSI). If there is an issue with SMF11A, 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 SMF11A part is unused and in its original packaging.
Return procedure for SMF11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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