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Taiwan Semiconductor Corporation SMF9.0AH
- Part No.:
- SMF9.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF9.0AH.pdf
- Description:
- TVS DIODE 9VWM 15.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:7,576
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Product details
Overview
SMF9.0AH from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for automotive-grade ESD and surge protection in low-voltage signal and power rails. It features a 9.0 V working stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR), 15.4 V clamping voltage (VC) at 5 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used in automotive lighting control modules and CAN/LIN bus interface protection.
For engineers reviewing the SMF9.0AH datasheet, SMF9.0AH pinout, SMF9.0AH application, or SMF9.0AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, SOD-123W package thermal resistance (RθJA = 100°C/W), and reverse leakage <1 µA at 9.0 V.
Technical Context
The SMF9.0AH operates as a unidirectional avalanche diode with glass-passivated junction for stable breakdown and low leakage. Its clamping behavior is defined by a 10/1000 µs double-exponential waveform, delivering 15.4 V VC at 5 A IPPM - critical for protecting 9 V rail ICs like microcontrollers and transceivers against load dump and EFT events.
Thermal design relies on its SOD-123W package mounted on a 5 mm × 5 mm copper pad, achieving RθJL = 33°C/W and RθJC = 34°C/W. It supports continuous operation from –55°C to +175°C junction temperature and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - maximum DC or continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 10.0–11.1 V - guaranteed avalanche onset range, ensuring reliable turn-on during transients |
| VC @ IPPM=5 A | 15.4 V - clamped voltage seen by protected circuit during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 200 W - peak transient power handling capability per IEC 61000-4-5 and ISO 7637-2 compliance |
| IR @ VWM | <1 µA - ultra-low leakage preserves battery life and signal integrity in always-on automotive circuits |
| TJ max | +175°C - enables placement near heat sources (e.g., power MOSFETs, motor drivers) without derating |
| Package | SOD-123W - compact 2.7 × 1.6 × 1.0 mm surface-mount outline with matte tin leads and UL 94V-0 molding compound |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode indicated by a band. The device has no internal pins; terminals are anode (unmarked end) and cathode (banded end), optimized for automated placement and reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential node (e.g., GND or return path) | Enables standard unidirectional clamping from protected line to ground when transient exceeds VBR |
| Cathode | Current exit point in forward bias; marked with band, connected to protected line (e.g., 9 V supply or signal) | Defines polarity-sensitive placement - reversal prevents clamping and risks catastrophic failure under surge |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, mechanical shock, and humidity testing |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to environmental contamination in harsh PCB environments |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Directly protects ECUs and body control modules against real-world vehicle electrical disturbances |
| RθJA = 100°C/W | Allows thermal design margin with minimal PCB copper area - only 5 mm × 5 mm Cu pad required for full 200 W pulse rating |
| Moisture sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Automotive Lighting Control | CAN Bus Interface Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp control units exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 9 V supply rail and chassis ground to clamp transients before they reach sensitive analog/digital circuitry. Use Value: Clamps to 15.4 V at 5 A, preventing latch-up or gate oxide damage in 12 V–compatible ICs while maintaining <1 µA leakage during normal operation. | Use Scenario: Safeguarding CAN transceiver inputs (CANH/CANL) against ESD and coupled noise in infotainment and gateway modules. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed inline with differential bus lines to suppress fast transients without distorting signal edges. Use Value: Meets ISO 7637-2 Pulse 3b (50 ns rise time), preserving CAN FD bit timing integrity up to 5 Mbps while surviving ±25 kV contact ESD per IEC 61000-4-2. |
| Industrial Sensor Signal Conditioning | Power Supply Input Stage Protection |
Use Scenario: Shielding 4–20 mA transmitter front-ends and ADC reference inputs from field-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional clamping device installed across sensor supply and return, referenced to local ground plane. Use Value: 10.0–11.1 V VBR ensures activation before overvoltage reaches op-amp input stages, with 15.4 V VC limiting stress on precision voltage references. | Use Scenario: Front-end protection of 9 V DC-DC converter inputs subjected to back-EMF from relay coils and solenoid switching. IC Role / Device Role / Timing Role: Primary surge suppression element placed directly at connector entry point, shunting energy to ground before reaching regulator IC. Use Value: 200 W PPPM rating handles repetitive 10/1000 µs pulses from inductive loads, and RθJL = 33°C/W enables sustained operation without heatsink. |
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 VWM (9.0 V), but higher VC = 16.7 V at 5 A; SOD-123 vs. SMA package (larger footprint, RθJA = 140°C/W) | Less effective clamping margin for 9 V rail ICs; requires larger PCB area and more thermal relief | Choose only if legacy SMA footprint compatibility is mandatory and clamping voltage margin allows |
| P6SMB9.0A | Same VWM and VC (15.4 V), but DO-214AA package (higher RθJA = 125°C/W); 600 W PPPM rating overshoots requirement | Over-specified power rating increases cost and size; less suitable for space-constrained automotive modules | Select when higher surge robustness is needed beyond ISO 7637-2, and board space permits DO-214AA |
Compared with SMAJ9.0A and P6SMB9.0A, the SMF9.0AH delivers tighter clamping (15.4 V), superior thermal performance (RθJA = 100°C/W), and AEC-Q101 qualification in the smallest footprint - making it optimal for modern automotive electronics where board space, thermal headroom, and qualification rigor are critical.
Availability
SMF9.0AH is available at Aetrix Electronics and suitable for automotive lighting control, CAN bus interface protection, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SMF9.0AH 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101 validation capabilities.
The SMF9.0AH belongs to TSC's SMF-AH series of automotive-grade TVS diodes, engineered specifically for ISO 7637-2 compliance and under-hood deployment in 12 V and 24 V vehicle electrical systems.
FAQ
What is the clamping voltage of the SMF9.0AH at its rated peak pulse current?
The SMF9.0AH has a maximum clamping voltage (VC) of 15.4 V when subjected to a 5 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 and ensures that downstream ICs on a 9 V rail remain within safe operating limits during surge events. The SMF9.0AH maintains this performance across its full operating temperature range of –55°C to +175°C.
Is the SMF9.0AH suitable for use in automotive applications requiring AEC-Q101 qualification?
Yes, the SMF9.0AH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2103). It undergoes stress testing for temperature cycling, high-temperature operating life, and mechanical shock - confirming suitability for under-hood automotive modules such as body control units and lighting controllers. The SMF9.0AH also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements.
What is the reverse leakage current specification for the SMF9.0AH at its working stand-off voltage?
The SMF9.0AH exhibits a maximum reverse leakage current (IR) of 1 µA at its 9.0 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage minimizes standby power loss in always-on automotive circuits and preserves signal integrity in high-impedance sensor interfaces. The SMF9.0AH maintains IR < 5 µA even at TJ = 125°C.
Can the SMF9.0AH be used in place of the SMAJ9.0A in an existing design?
The SMF9.0AH is not a direct pin-to-pin replacement for the SMAJ9.0A due to differing packages: SMF9.0AH uses SOD-123W (2.7 × 1.6 mm), while SMAJ9.0A uses SMA (4.5 × 2.7 mm). Though both have identical VWM (9.0 V), the SMF9.0AH offers lower clamping voltage (15.4 V vs. 16.7 V) and better thermal resistance (RθJA = 100°C/W vs. 140°C/W). Layout revision is required to adopt SMF9.0AH.
What is the maximum junction temperature rating for the SMF9.0AH, and how does it affect PCB layout?
The SMF9.0AH has a maximum junction temperature (TJ max) of +175°C, enabling operation in high-temperature automotive zones. To achieve full 200 W pulse rating, the device must be mounted on a 5 mm × 5 mm copper pad per the datasheet's thermal test condition. Reducing pad size or omitting thermal vias will increase RθJA and require derating - the SMF9.0AH's RθJA = 100°C/W assumes this baseline layout.
SMF9.0AH 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF9.0AH FAQ
1.How can I place an order for SMF9.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF9.0AH 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 SMF9.0AH reliable?
The price and inventory of SMF9.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF9.0AH is usually 5 days.
3.What payment methods are accepted for SMF9.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF9.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF9.0AH?
SMF9.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF9.0AH 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 SMF9.0AH?
For technical support, including SMF9.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF9.0AH requirements.
6.How does Aetrix verify that SMF9.0AH is sourced from the original manufacturer or authorized distributors?
All SMF9.0AH 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 SMF9.0AH meets industry standards.
7.What is the process for return or replacement of SMF9.0AH?
All SMF9.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF9.0AH, 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 SMF9.0AH part is unused and in its original packaging.
Return procedure for SMF9.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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