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Taiwan Semiconductor Corporation SMF8.5A
- Part No.:
- SMF8.5A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF8.5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:3,990
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Product details
Overview
SMF8.5A 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 8.5 V working stand-off voltage (VWM), 9.44–10.5 V breakdown voltage (VBR) at 1 mA, 13.9 V clamping voltage (VC) at 10 A peak pulse current, and 200 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMF8.5A datasheet, SMF8.5A pinout, SMF8.5A application, or SMF8.5A equivalent, key selection criteria include clamping performance under IEC 61000-4-2/4-5 stress, SOD-123W package compatibility with automated assembly, low leakage (<1 µA @ 8.5 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive electronics.
Technical Context
The SMF8.5A operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified breakdown range. Its clamping action limits transient-induced overvoltage to ≤13.9 V at 10 A, protecting downstream ICs such as microcontrollers, CAN transceivers, and sensor interfaces.
Thermal design relies on its SOD-123W package with RθJA = 100 °C/W and RθJL = 33 °C/W, enabling reliable operation up to TJ = 175 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.5 V @ 1 mA - Ensures predictable turn-on threshold across production lot |
| VC @ IPPM | 13.9 V @ 10 A - Limits worst-case transient voltage seen by protected circuitry |
| PPPM | 200 W (10/1000 µs) - Withstands automotive load dump and EFT bursts per ISO 7637-2 |
| IR @ VWM | <1 µA - Negligible standby power loss and minimal impact on high-impedance sensing nodes |
| Package | SOD-123W - Surface-mount footprint compatible with standard pick-and-place and reflow processes |
| Polarity | Cathode band marked - Enables unambiguous orientation during automated assembly and visual inspection |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode-indicating band. Terminals are matte tin-plated, solderable per J-STD-002, and rated UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; defines current flow direction during clamping |
| Cathode | Protected line input | Connected to the line being protected (e.g., 12 V rail, CAN_H); conducts transient energy to ground when VAK ≥ VBR |
Key Features
| Feature | Design Value |
|---|---|
| Photo glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| Clamping voltage ≤13.9 V @ 10 A | Provides margin below typical 15 V absolute maximum ratings of automotive MCUs and transceivers |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for use in automotive body control modules, infotainment power supplies, and LIN/CAN bus protection |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
| Halogen-free & RoHS compliant | Supports environmental compliance for global OEM and industrial equipment shipments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in body control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp surges before regulation. Use Value: Limits voltage excursion to ≤13.9 V, preserving LDO integrity and preventing MCU brownout or latch-up. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) from ESD events during handling or cable coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transient energy at sensor connector entry point. Use Value: Sub-1 µA leakage avoids signal offset errors; fast response preserves sensor accuracy in 4–20 mA or ratiometric systems. |
| Consumer USB Port ESD Protection | Smart Lighting Driver Protection |
Use Scenario: Adding secondary-level ESD immunity to USB VBUS lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse, upstream of USB switch or power delivery controller. Use Value: Clamps ±15 kV contact discharge (IEC 61000-4-2) without degrading VBUS regulation or causing false overvoltage shutdown. | Use Scenario: Shielding constant-current LED drivers from inductive switching spikes generated by relay or MOSFET control circuits. IC Role / Device Role / Timing Role: TVS connected across driver output terminals to absorb flyback energy from inductive loads. Use Value: 200 W peak power rating absorbs repetitive 100 µs–1 ms transients without degradation, extending driver IC lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A (ON Semiconductor) | Same VWM (8.5 V), but higher VC = 14.4 V @ 10 A; SOD-123 package (not SOD-123W) | Slightly larger PCB footprint required; lower thermal robustness (RθJA ≈ 125 °C/W vs. 100 °C/W) | Acceptable where layout allows minor pad adjustment and thermal margin is sufficient |
| P6SMB8.5A (Littelfuse) | Same VWM and VC, but DO-214AA package (SMB); 600 W PPPM rating | Larger footprint and height; suited for higher-energy transients but incompatible with dense SMT layouts | Preferred only when system-level surge tests exceed 200 W or require legacy SMB footprint |
Compared with SMAJ8.5A and P6SMB8.5A, the SMF8.5A offers optimized thermal performance in a compact SOD-123W package, making it ideal for space-constrained automotive and industrial PCBs where 200 W surge immunity suffices and lead-to-ambient thermal resistance must stay ≤100 °C/W.
Availability
SMF8.5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer USB power protection, and smart lighting driver designs requiring stable component supply and full traceability.
Supply support for SMF8.5A 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 for industrial, automotive, and consumer markets.
The SMF series was developed specifically for high-reliability, surface-mount transient suppression in automotive ECUs and industrial control systems-emphasizing low clamping voltage, AEC-Q101 readiness, and automated assembly compatibility.
FAQ
What is the breakdown voltage range of the SMF8.5A?
The SMF8.5A has a guaranteed breakdown voltage (VBR) range of 9.44 V to 10.5 V at 1 mA test current, measured per JEDEC standards. This tight tolerance ensures consistent clamping behavior across production lots and supports robust design margins in 12 V automotive and industrial systems where the SMF8.5A is commonly deployed.
Does the SMF8.5A meet automotive transient immunity standards?
Yes, the SMF8.5A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. Its 200 W peak pulse power rating and 13.9 V clamping voltage at 10 A enable reliable protection of ECUs, sensors, and communication interfaces in automotive applications where the SMF8.5A is specified.
What is the maximum clamping voltage of the SMF8.5A under surge conditions?
The SMF8.5A exhibits a maximum clamping voltage (VC) of 13.9 V when subjected to a 10 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events-critical for ensuring compatibility with 15 V-tolerant ICs in systems using the SMF8.5A.
Is the SMF8.5A RoHS and halogen-free compliant?
Yes, the SMF8.5A is fully RoHS compliant and halogen-free per IEC 61249-2-21. These compliance attributes are verified in TSC's material declarations and support global regulatory requirements for end equipment, including automotive modules and industrial controllers where the SMF8.5A is integrated.
What is the thermal resistance from junction to ambient for the SMF8.5A?
The SMF8.5A has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard 5 mm × 5 mm copper pad PCB. This value enables accurate thermal modeling for designs operating up to 175 °C junction temperature, supporting reliable deployment of the SMF8.5A in under-hood automotive and high-temperature industrial environments.
SMF8.5A 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- 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
SMF8.5A FAQ
1.How can I place an order for SMF8.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF8.5A 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 SMF8.5A reliable?
The price and inventory of SMF8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF8.5A is usually 5 days.
3.What payment methods are accepted for SMF8.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF8.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF8.5A?
SMF8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF8.5A 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 SMF8.5A?
For technical support, including SMF8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF8.5A requirements.
6.How does Aetrix verify that SMF8.5A is sourced from the original manufacturer or authorized distributors?
All SMF8.5A 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 SMF8.5A meets industry standards.
7.What is the process for return or replacement of SMF8.5A?
All SMF8.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMF8.5A, 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 SMF8.5A part is unused and in its original packaging.
Return procedure for SMF8.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF8.5A Tags
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