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Taiwan Semiconductor Corporation SMF11AH
- Part No.:
- SMF11AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF11AH.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
SMF11AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade circuit protection. It features a 11 V working stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR), 18.2 V maximum clamping voltage (VC) at 11.0 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is used to protect automotive lighting control modules and ECU input lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMF11AH datasheet, SMF11AH pinout, SMF11AH application, or SMF11AH equivalent, key selection criteria include its AEC-Q101 qualification, SOD-123W package compatibility with automated placement, low reverse leakage (<1 µA @ 11 V), and verified clamping performance under repetitive fast-transient stress in 12 V automotive systems.
Technical Context
The SMF11AH operates as a unidirectional avalanche diode with photo-glass passivated junction for stable breakdown behavior and low leakage. Its thermal design supports operation up to +175 °C junction temperature, with RθJL = 33 °C/W enabling effective heat transfer to PCB copper pads.
It meets ISO 7637-2 immunity requirements for automotive electronics, delivering consistent clamping response across Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), and Pulse 3a/b (capacitive coupling transients), with no degradation after repeated 10/1000 µs waveform exposure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold. |
| VBR min / max | 12.2 V / 13.5 V - Verified avalanche onset range at 1 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 18.2 V @ 11.0 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels in 12 V rail protection. |
| PPPM | 200 W - Peak pulse power handling per JEDEC standard; sustains single-event transients without failure. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; avoids parasitic loading on sensitive sensor or communication inputs. |
| Package | SOD-123W - Surface-mount outline with 5 mm × 5 mm Cu pad thermal interface; supports automated reflow and meets J-STD-020 Level 1 moisture sensitivity. |
Pinout & Package
SOD-123W package: two-terminal surface-mount device with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; defines current flow direction during clamping. |
| Cathode | Protected line connection | Connected to the signal or power line requiring transient suppression; carries full surge current to anode during clamp event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications per stress test requirements including HTOL, TC, and HAST. |
| Photo-glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Clamping ratio VC/VBR | ≤1.49 - Low clamping ratio confirms efficient energy diversion with minimal voltage overshoot during surge events. |
| ISO 7637-2 compliance | Tested and verified for Pulse 1, 2a, 2b, 3a, and 3b waveforms - enables drop-in use in automotive OEM designs without additional validation. |
Applications
| Automotive Lighting Control | Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontroller GPIOs from load-dump transients in headlamp and tail lamp circuits. IC Role / Device Role: Unidirectional TVS placed between 12 V supply rail and ground, clamping surges induced by relay switching or alternator regulation faults. Use Value: Limits peak voltage to ≤18.2 V during 200 W pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Safeguarding LIN bus receivers and switch sense inputs in door modules and seat controllers against EFT and coupling noise. IC Role / Device Role: Point-of-entry protection on each signal line, leveraging low capacitance and sub-µA leakage to avoid signal integrity degradation. Use Value: Maintains <1 µA leakage at 11 V, ensuring accurate analog sensing and reliable LIN communication up to 20 kbps. |
| Engine Control Unit (ECU) Sensor Lines | Infotainment Power Supply Rails |
Use Scenario: Shielding crankshaft position and oxygen sensor analog outputs from ignition-induced spikes and alternator ripple. IC Role / Device Role: Low-capacitance TVS mounted directly at connector entry point, minimizing trace inductance before protected IC. Use Value: Achieves 12.2–13.5 V VBR tolerance, aligning precisely with 12 V system nominal and allowing clean signal fidelity below clamping threshold. | Use Scenario: Suppressing conducted transients on 5 V/3.3 V DC-DC output rails feeding display drivers and audio codecs. IC Role / Device Role: Secondary-stage clamping after bulk filtering, absorbing residual fast edges that bypass LC filters. Use Value: Delivers 200 W pulse handling with 18.2 V VC, preventing brownout or reset events during battery load dump recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Same VWM (11 V), but higher VC (23.0 V @ 10.5 A); lower PPPM (400 W, but derated to ~175 W at TJ > 25°C) | Less precise clamping margin; suitable for non-automotive industrial use where tighter voltage control is not required | Select SMAJ11A only if board layout allows larger SMA package and thermal management accommodates higher RθJA. |
| 1.5SMC11A | Higher VWM (11 V), same VBR range, but larger SMC package; VC = 18.2 V @ 11.0 A, PPPM = 1500 W (10/1000 µs) | Over-specified power rating increases cost and footprint; requires larger PCB area and different reflow profile | Choose 1.5SMC11A only when legacy SMC footprint is fixed and system demands >200 W surge margin. |
Compared with SMAJ11A and 1.5SMC11A, the SMF11AH provides optimal balance of AEC-Q101 compliance, SOD-123W compactness, and tight 18.2 V clamping-making it preferred for space-constrained automotive modules where precise voltage limiting and automated assembly are mandatory.
Availability
SMF11AH is available at Aetrix Electronics and suitable for automotive lighting control, body electronics, engine management, and infotainment power rail protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF11AH 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, and rectifiers with global automotive and industrial certifications.
The SMF11AH belongs to TSC's AEC-Q101-qualified SMF-AH series, engineered specifically for robust, high-reliability transient suppression in 12 V automotive electrical systems.
FAQ
What is the maximum clamping voltage of the SMF11AH under standard test conditions?
The SMF11AH has a maximum clamping voltage (VC) of 18.2 V when subjected to a 10/1000 µs surge waveform at 11.0 A peak pulse current. This value is measured per JEDEC standards and reflects the actual voltage seen by downstream components during transient events, confirming its suitability for protecting 12 V automotive circuits without exceeding safe IC voltage limits.
Is the SMF11AH qualified for automotive applications?
Yes, the SMF11AH is AEC-Q101 qualified and tested for automotive environments, including thermal cycling, humidity, and mechanical shock. It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, making it appropriate for under-hood and cabin applications such as lighting control and body electronics where reliability under harsh conditions is essential.
What package type does the SMF11AH use, and is it compatible with automated assembly?
The SMF11AH uses the SOD-123W surface-mount package, which features matte tin-plated leads compliant with J-STD-002 solderability standards. Its small footprint and lead geometry are optimized for high-speed pick-and-place machines and standard reflow profiles, supporting fully automated PCB assembly without manual intervention or special process adjustments.
How does the SMF11AH compare to generic TVS diodes in terms of leakage current?
The SMF11AH exhibits less than 1 µA reverse leakage current at its full 11 V working stand-off voltage, significantly lower than many non-automotive TVS diodes. This ultra-low leakage prevents unwanted loading on precision sensor inputs or low-power microcontroller I/O lines, preserving signal accuracy and reducing standby power consumption in always-on automotive subsystems.
Does the SMF11AH require external heat sinking for typical automotive operating conditions?
No, the SMF11AH does not require external heat sinking under normal automotive operating conditions. With a junction-to-lead thermal resistance (RθJL) of 33 °C/W and a maximum junction temperature of +175 °C, it safely dissipates transient energy into a standard 5 mm × 5 mm copper pad on FR-4 PCB-provided layout follows TSC's recommended pad dimensions and thermal vias are used per datasheet guidelines.
SMF11AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF11AH FAQ
1.How can I place an order for SMF11AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF11AH 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 SMF11AH reliable?
The price and inventory of SMF11AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF11AH is usually 5 days.
3.What payment methods are accepted for SMF11AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF11AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF11AH?
SMF11AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF11AH 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 SMF11AH?
For technical support, including SMF11AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF11AH requirements.
6.How does Aetrix verify that SMF11AH is sourced from the original manufacturer or authorized distributors?
All SMF11AH 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 SMF11AH meets industry standards.
7.What is the process for return or replacement of SMF11AH?
All SMF11AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF11AH, 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 SMF11AH part is unused and in its original packaging.
Return procedure for SMF11AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF11AH Tags
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