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Taiwan Semiconductor Corporation SMF9.0A
- Part No.:
- SMF9.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF9.0A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,951
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Product details
Overview
SMF9.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. 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 waveform), commonly deployed in automotive lighting control modules and industrial sensor interfaces.
For engineers reviewing the SMF9.0A datasheet, SMF9.0A pinout, SMF9.0A application, or SMF9.0A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA @ 9.0 V), SOD-123W package compatibility with automated placement, and thermal robustness up to TJ = +175 °C.
Technical Context
The SMF9.0A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 10.0–11.1 V breakdown threshold, diverting transient energy to ground while limiting downstream voltage to ≤15.4 V at 5 A. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Designed for PCB-level protection of ICs and microcontrollers, it meets ISO 7637-2 immunity requirements for automotive electronics and supports steady-state power dissipation of 1 W at TL = 25 °C on a 5 mm × 5 mm copper pad, with RθJA = 100 °C/W and RθJL = 33 °C/W for thermal management planning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V systems. |
| VBR @ IT = 1 mA | 10.0–11.1 V - Breakdown voltage range confirming reliable turn-on above nominal supply; tight ±5.5% tolerance enables predictable protection timing. |
| VC @ IPPM = 5 A | 15.4 V - Clamped voltage during 10/1000 µs surge; limits stress on downstream 16 V-rated ICs in automotive body control units. |
| PPPM (10/1000 µs) | 200 W - Peak pulse power handling capacity; sufficient for ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 40 ms) and Pulse 2b (−25 V, 2 Ω, 50 ms) waveforms. |
| IR @ VWM | <1 µA - Reverse leakage at 9.0 V; negligible power loss and no measurable impact on battery-powered sensor node standby current. |
| Junction Temp Range | −55 °C to +175 °C - Full operational range supports under-hood automotive placement and industrial motor drive environments. |
Pinout & Package
Package: SOD-123W - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, polarity indicated by cathode band, weight ≈ 0.016 g, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); enables unidirectional clamping from cathode to anode during transients. |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 12 V rail or CAN-H); conducts only when reverse voltage exceeds VBR, shunting surge to anode/GND. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, critical for automotive applications requiring >10-year field reliability without parameter drift. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect/line drop), and Pulse 3a/3b (switching noise), enabling direct use in OEM automotive ECUs. |
| Low IR <1 µA @ VWM | Eliminates measurable quiescent current penalty in always-on systems such as telematics modules or smart sensors with µA-level sleep budgets. |
| SOD-123W mechanical design | Optimized for high-speed pick-and-place assembly; JESD 201 Class 2 whisker resistance and solderability per J-STD-002 ensure manufacturing yield in volume production. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump surges in headlamp and tail lamp modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and GND, clamping transients within 1 ns to prevent latch-up or gate oxide damage. Use Value: With VC = 15.4 V at 5 A, it keeps protected ICs below absolute maximum ratings during ISO 7637-2 Pulse 1 (−150 V), avoiding costly field failures. | Use Scenario: Shielding 4–20 mA current-loop transmitters and analog front-ends from EFT bursts in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Primary surge clamp on loop supply line, coordinated with series current-limiting resistor to manage energy absorption. Use Value: 200 W PPPM rating handles repeated 5 kHz EFT bursts (IEC 61000-4-4) without degradation, maintaining signal integrity across 10+ years of operation. |
| USB Port ESD Protection | DC Motor Drive Feedback Line |
Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines in USB 2.0 host ports where primary protection resides upstream. IC Role / Device Role / Timing Role: Fast-response clamping device absorbing ±8 kV contact discharge (IEC 61000-4-2) before transients reach USB PHY or controller. Use Value: Sub-1 ns response time and <1 µA leakage preserve bus signaling integrity and meet USB suspend current specs without added bias circuitry. | Use Scenario: Safeguarding hall-effect sensor outputs and encoder feedback lines in BLDC motor drives exposed to commutation-induced spikes. IC Role / Device Role / Timing Role: Localized TVS at sensor connector, suppressing inductive kickback from nearby motor windings coupled via shared chassis ground. Use Value: 15.4 V clamping prevents false zero-crossing detection and maintains position accuracy during high-dV/dt events in 48 V e-bike or power tool controllers. |
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 SMAJ9.0A | Same SOD-123 package, identical VWM (9.0 V), but higher VC = 15.6 V at 5.3 A; slightly lower PPPM = 400 W (vs. 200 W) due to different test condition definition (400 W at 10/1000 µs, but rated at 1 kW for 1 ms). | Validated for MIL-STD-1275E and DO-160 Section 22, making it preferred for aerospace and military avionics where extended surge duration matters. | Select SMAJ9.0A when system-level testing requires compliance beyond ISO 7637-2, especially for 1 ms pulse immunity or higher single-event energy. |
| ON Semiconductor SMCJ9.0A | DO-214AB (SMC) package - larger footprint, higher thermal mass; same VWM/VBR/VC specs, but PPPM = 1500 W (10/1000 µs) and RθJA = 15 °C/W (vs. 100 °C/W for SMF9.0A). | Used in high-power industrial inverters where board space allows larger packages and where sustained surge repetition demands superior heat dissipation. | Choose SMCJ9.0A only if PCB layout permits DO-214AB and thermal design requires >10× higher pulse energy handling than SMF9.0A's 200 W rating. |
Compared with SMAJ9.0A and SMCJ9.0A, the SMF9.0A delivers optimal balance of compact SOD-123W footprint, automotive-grade ISO 7637-2 compliance, and low-leakage performance for space-constrained 12 V systems-making it ideal for cost-sensitive, high-volume automotive and industrial modules where board area and assembly speed are critical.
Availability
SMF9.0A is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and USB port ESD protection requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for SMF9.0A 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMF5.0A–SMF100A family was engineered specifically for surface-mount surge protection in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and automated assembly readiness in the SOD-123W package.
FAQ
What is the clamping voltage of SMF9.0A at its rated peak pulse current?
The SMF9.0A has a maximum clamping voltage (VC) of 15.4 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 5 A. This value is measured per the standard test condition defined in the Taiwan Semiconductor datasheet and ensures downstream components remain within safe operating voltage limits during surge events.
Is SMF9.0A suitable for bidirectional transient protection?
No, SMF9.0A is a unidirectional TVS diode and is not rated for bidirectional operation. It provides protection only against negative transients on the cathode side relative to anode. For bidirectional applications such as AC lines or differential data buses, a dedicated bidirectional part like SMF9.0CA must be selected instead of SMF9.0A.
Does SMF9.0A meet automotive qualification standards?
Yes, SMF9.0A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. It is qualified per AEC-Q101 for TVS diodes and is widely used in automotive body control modules, lighting systems, and infotainment power rails where robust transient immunity is mandated.
What is the marking code for SMF9.0A on the device body?
The SMF9.0A is marked with "2W9P0" on its SOD-123W package. This 5-character code identifies the specific voltage variant within the SMF5.0A–SMF100A family and is laser-etched or printed adjacent to the cathode band for visual and automated inspection verification.
Can SMF9.0A be used in place of SMAJ9.0A without layout changes?
No - although both are 9.0 V unidirectional TVS diodes, SMF9.0A uses the SOD-123W package while SMAJ9.0A uses SMA (DO-214AC). Their footprints are incompatible: SOD-123W measures 2.7 × 1.6 mm, whereas SMA is 4.5 × 2.7 mm. PCB redesign is required to substitute one for the other.
SMF9.0A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF9.0A FAQ
1.How can I place an order for SMF9.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF9.0A 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 SMF9.0A reliable?
The price and inventory of SMF9.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF9.0A is usually 5 days.
3.What payment methods are accepted for SMF9.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF9.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF9.0A?
SMF9.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF9.0A 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 SMF9.0A?
For technical support, including SMF9.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF9.0A requirements.
6.How does Aetrix verify that SMF9.0A is sourced from the original manufacturer or authorized distributors?
All SMF9.0A 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 SMF9.0A meets industry standards.
7.What is the process for return or replacement of SMF9.0A?
All SMF9.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMF9.0A, 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 SMF9.0A part is unused and in its original packaging.
Return procedure for SMF9.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF9.0A Tags
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