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Taiwan Semiconductor Corporation SMF17A
- Part No.:
- SMF17A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF17A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:5,406
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Product details
Overview
SMF17A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, with 17 V working stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 27.6 V clamping voltage (VC) at 7.2 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SMF17A datasheet, SMF17A pinout, SMF17A application, or SMF17A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature range (−55 °C to +175 °C), moisture sensitivity level (J-STD-020 Level 1), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
The SMF17A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (18.9–20.9 V @ 1 mA). Its low clamping ratio (VC/VBR ≈ 1.36) ensures effective overvoltage suppression while limiting stress on downstream ICs.
Thermal design relies on its 33 °C/W junction-to-lead (RθJL) and 100 °C/W junction-to-ambient (RθJA) resistance values-measured on a 5 mm × 5 mm Cu pad test board-supporting reliable operation up to 175 °C junction temperature under pulsed conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 18.9 V / 20.9 V @ 1 mA - Confirmed avalanche onset range for reliable trigger threshold |
| VC @ IPPM | 27.6 V @ 7.2 A (10/1000 µs) - Peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 200 W - Surge energy handling capability per IEC 61000-4-5 and ISO 7637-2 compliant pulses |
| IR @ VWM | <1 µA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +175 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| Package | SOD-123W - Surface-mount outline with matte tin-plated leads, J-STD-002 solderable, UL 94V-0 molding |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode indicated by a band. The device has no internal logic or control pins-only anode and cathode terminals for series connection across protected lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line | Enables unidirectional clamping-conducts only when cathode is >17 V above anode |
| Cathode | Current exit point in forward bias; marked with band; connected to higher-potential side | Defines polarity-sensitive placement-must align with system ground or supply rail orientation |
Key Features
| Feature | Design Value |
|---|---|
| Photo glass passivated junction | Ensures stable VBR and low IR over lifetime, even under humidity and thermal cycling stress |
| Clamping voltage ≤27.6 V at 7.2 A | Provides margin below typical 3.3 V/5 V/12 V IC absolute maximum ratings during surge events |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive-switching immunity without external filtering |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking-compatible with standard SMT assembly lines |
| Halogen-free & RoHS compliant | Fulfills environmental compliance requirements for EU, China RoHS, and automotive OEM specifications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits voltage to ≤27.6 V during 200 W pulses, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding 4–20 mA current-loop sensor inputs from EFT and cable-induced spikes. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before signal conditioning amplifiers. Use Value: Sub-1 µA leakage preserves loop accuracy; 27.6 V clamping prevents op-amp input stage saturation or destruction. |
| LED Driver Overvoltage Clamp | USB Port ESD Suppression |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb inductive kickback from long wiring runs. Use Value: 200 W pulse rating handles multi-millisecond transients; SOD-123W footprint enables compact layout near connectors. | Use Scenario: Adding secondary-level ESD protection on USB VBUS line in embedded host devices. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch to limit voltage during ±8 kV contact discharge. Use Value: 17 V VWM allows normal 5 V operation; 27.6 V VC ensures USB PHY remains within safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17A (Bourns) | Same VWM (17 V), but SMB package (larger footprint, higher RθJA = 125 °C/W) | Higher thermal mass supports longer surge duration; less suitable for ultra-compact layouts | Select when board space permits and higher steady-state power dissipation is needed |
| P6SMB17A (ON Semiconductor) | Identical electrical specs (VWM=17 V, VC=27.6 V), same SOD-123W package, but JEDEC-compliant marking | No functional difference; validated for same ISO 7637-2 pulses and automotive qualification | Drop-in alternative with identical mounting and performance-ideal for dual-sourcing |
Compared with SMBJ17A and P6SMB17A, the SMF17A offers identical clamping and stand-off performance in the smallest standardized TVS footprint (SOD-123W), enabling higher board density while maintaining full ISO 7637-2 compliance and J-STD-020 Level 1 handling.
Availability
SMF17A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and LED lighting surge mitigation requiring stable component supply and full traceability.
Supply support for SMF17A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMF series belongs to TSC's transient voltage suppression product line, engineered specifically for high-reliability, high-surge-capacity protection in space-constrained surface-mount applications where ISO 7637-2 and IEC 61000-4-5 compliance are mandatory.
FAQ
What is the clamping voltage of the SMF17A under a 10/1000 µs surge?
The SMF17A clamps to a maximum of 27.6 V when subjected to a 7.2 A peak pulse current with a 10/1000 µs waveform. This value is measured and guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Is the SMF17A suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMF17A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as explicitly stated in the official Taiwan Semiconductor datasheet. Its 200 W peak pulse power rating and verified clamping behavior make it appropriate for 12 V automotive power rail protection.
What is the maximum junction temperature rating for the SMF17A?
The SMF17A has a maximum junction temperature (TJ) rating of +175 °C, allowing reliable operation in under-hood automotive environments and high-temperature industrial enclosures. This rating is maintained under both steady-state and pulsed power conditions per the thermal derating curves in the datasheet.
Does the SMF17A have a unidirectional or bidirectional configuration?
The SMF17A is a unidirectional TVS diode, designed to clamp only in reverse bias above its 17 V stand-off voltage. Its marking code "2W017" and cathode band indicate polarity-sensitive placement-forward conduction is not intended for protection use.
What is the moisture sensitivity level (MSL) of the SMF17A?
The SMF17A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be assembled using standard reflow profiles without pre-baking. This simplifies manufacturing logistics and eliminates moisture-related popcorning risks during SMT processing.
SMF17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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
SMF17A FAQ
1.How can I place an order for SMF17A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF17A 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 SMF17A reliable?
The price and inventory of SMF17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF17A is usually 5 days.
3.What payment methods are accepted for SMF17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF17A?
SMF17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF17A 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 SMF17A?
For technical support, including SMF17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF17A requirements.
6.How does Aetrix verify that SMF17A is sourced from the original manufacturer or authorized distributors?
All SMF17A 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 SMF17A meets industry standards.
7.What is the process for return or replacement of SMF17A?
All SMF17A units undergo pre-shipment inspection (PSI). If there is an issue with SMF17A, 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 SMF17A part is unused and in its original packaging.
Return procedure for SMF17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF17A Tags
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