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Taiwan Semiconductor Corporation SMF17AH
- Part No.:
- SMF17AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF17AH.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:8,367
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Product details
Overview
SMF17AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 200 W peak pulse power (10/1000 µs), 17 V working stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), and clamps to ≤27.6 V at 7.2 A peak impulse current. It protects automotive and industrial control circuits against ISO 7637-2 pulses and ESD transients.
For engineers reviewing the SMF17AH datasheet, SMF17AH pinout, SMF17AH application, or SMF17AH equivalent, this page delivers verified electrical parameters, thermal resistance values (RθJL = 33 °C/W), AEC-Q101 qualification status, moisture sensitivity level (MSL 1), and real-world clamping behavior under standardized surge waveforms.
Technical Context
The SMF17AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling low leakage (<1 µA at 17 V) and fast response to transients. Its 10/1000 µs waveform rating supports robust protection against load dump and inductive switching events per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b.
Thermally, it features RθJL = 33 °C/W and RθJA = 100 °C/W when mounted on a 5 mm × 5 mm copper pad, allowing reliable operation up to TJ = 175 °C. The SOD-123W package provides mechanical robustness and automated placement compatibility.
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 - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | ≤27.6 V at 7.2 A - Clamping voltage during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 200 W - Peak pulse power handling capability under standardized transient waveform |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in battery-powered systems |
| TJ max | +175 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures |
| RθJL | 33 °C/W - Low junction-to-lead thermal resistance supports efficient heat transfer to PCB copper |
Pinout & Package
Package: SOD-123W - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity indicator. Weight: 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to protected circuit ground or low-side return path during clamping |
| Cathode | Current exit terminal in forward bias; marked by band | Connected to supply rail or signal line requiring overvoltage protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements |
| MSL Level 1 | No floor life limitation - safe for reflow soldering without dry pack or baking preconditioning |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting environmental compliance and safer end-of-life processing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver lines from load dump and relay coil flyback in vehicle door modules and lighting controllers. IC Role / Device Role: Unidirectional TVS placed between signal line and ground to clamp negative-going transients and absorb positive surges via avalanche conduction. Use Value: Limits voltage excursion to ≤27.6 V during 7.2 A transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Shields 24 V digital input terminals of programmable logic controllers from inductive kickback caused by solenoid or contactor switching. IC Role / Device Role: Standoff-rated TVS connected across input and common, conducting only during overvoltage events exceeding 17 V. Use Value: Delivers 200 W surge handling without degradation, maintaining signal integrity and eliminating need for external series impedance. |
| LED Driver Power Input Stage | USB-C Port ESD Protection |
Use Scenario: Placed at DC input of constant-current LED drivers used in commercial signage to suppress voltage spikes from nearby motor starts or lightning-induced surges. IC Role / Device Role: Primary overvoltage clamp on bulk input rail, absorbing energy before it reaches switching regulator ICs. Use Value: Withstands repetitive 10/1000 µs pulses up to 200 W while exhibiting <1 µA leakage at 17 V, minimizing quiescent power loss. | Use Scenario: Integrated into USB-C receptacle layout to protect CC, VBUS, and D+/D− lines from human-body-model (HBM) and system-level ESD events. IC Role / Device Role: Secondary-level TVS after primary common-mode choke, providing low-capacitance (<50 pF typical), low-leakage clamping. Use Value: Clamps to ≤27.6 V within nanoseconds, preserving USB 2.0 signal integrity and meeting IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Same VWM (17 V), but lower PPPM (400 W), larger SMA package (higher RθJA = 145 °C/W) | Better suited for higher-energy single-event surges; less ideal for space-constrained PCBs | Choose SMAJ17A if peak power >200 W is required and board area allows SMA footprint |
| P6SMB17A | Same VWM (17 V), same SOD-123W-equivalent SMB package, but higher IR (5 µA @ VWM) and no AEC-Q101 qualification | Lacks automotive qualification; suitable for industrial/commercial use only | Choose P6SMB17A for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with SMAJ17A and P6SMB17A, the SMF17AH offers optimal balance of AEC-Q101 compliance, MSL 1 handling, compact SOD-123W footprint, and precise 27.6 V clamping-making it preferred for automotive body electronics and space-limited industrial controls requiring certified reliability.
Availability
SMF17AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, LED driver front-end protection, and USB-C port ESD hardening requiring stable component supply and full traceability.
Supply support for SMF17AH 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-compliant product lines.
The SMF17AH belongs to TSC's SMF-AH series of automotive-grade transient voltage suppressors, engineered specifically for ISO 7637-2 compliance and under-hood deployment in 12 V/24 V vehicle systems.
FAQ
What is the maximum clamping voltage of the SMF17AH under standard surge conditions?
The SMF17AH clamps to a maximum of 27.6 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 7.2 A. This value is measured per JEDEC standards and ensures downstream components like microcontrollers or transceivers remain within safe operating voltage limits during transient events such as load dump or inductive switching.
Is the SMF17AH qualified for automotive applications?
Yes, the SMF17AH is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD verification. This qualification confirms its suitability for automotive powertrain, body electronics, and infotainment systems where reliability under extreme thermal and electrical stress is mandatory.
What package type does the SMF17AH use, and why is it advantageous?
The SMF17AH uses the SOD-123W package-a compact, surface-mount outline with enhanced thermal performance (RθJL = 33 °C/W) and matte tin-plated leads compatible with lead-free reflow. Its small footprint (2.7 × 1.6 × 1.0 mm) enables high-density PCB layouts, while the glass-passivated junction improves long-term parameter stability in humid or thermally cycled environments.
Does the SMF17AH meet international ESD and surge immunity standards?
Yes, the SMF17AH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems and supports system-level ESD immunity per IEC 61000-4-2. Its low clamping voltage (≤27.6 V), sub-1 µA leakage at 17 V, and fast response time make it effective for protecting sensitive analog and digital interfaces against both conducted and radiated transients.
How does the SMF17AH compare to generic TVS diodes in terms of moisture sensitivity and assembly compatibility?
The SMF17AH is rated MSL Level 1 per J-STD-020, meaning it has no floor life limitation and can be stored indefinitely at ambient conditions without dry packing or baking prior to reflow. This eliminates moisture-related popcorning risks during assembly and simplifies manufacturing logistics compared to MSL 2–3 devices that require strict handling protocols.
SMF17AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF17AH FAQ
1.How can I place an order for SMF17AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF17AH 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 SMF17AH reliable?
The price and inventory of SMF17AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF17AH is usually 5 days.
3.What payment methods are accepted for SMF17AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF17AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF17AH?
SMF17AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF17AH 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 SMF17AH?
For technical support, including SMF17AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF17AH requirements.
6.How does Aetrix verify that SMF17AH is sourced from the original manufacturer or authorized distributors?
All SMF17AH 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 SMF17AH meets industry standards.
7.What is the process for return or replacement of SMF17AH?
All SMF17AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF17AH, 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 SMF17AH part is unused and in its original packaging.
Return procedure for SMF17AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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