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Taiwan Semiconductor Corporation SMF8.0AH
- Part No.:
- SMF8.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF8.0AH.pdf
- Description:
- 200W, 9.3V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,945
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Product details
Overview
SMF8.0AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in low-voltage DC circuits. It features a 8.0 V working stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR), 13.6 V clamping voltage (VC) at 50 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used to protect CAN/LIN bus interfaces, microcontroller I/O pins, and sensor signal lines against ISO 7637-2 pulses.
For engineers reviewing the SMF8.0AH datasheet, SMF8.0AH pinout, SMF8.0AH application, or SMF8.0AH equivalent, key selection criteria include its SOD-123W package compatibility with automated placement, sub-1 μA reverse leakage at 8.0 V, 175 °C max junction temperature, and verified immunity to Pulse 1/2a/2b/3a/3b per ISO 7637-2 - critical for automotive body electronics and ADAS subsystems.
Technical Context
The SMF8.0AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to transient overvoltages. Its clamping behavior is defined by a 10/1000 μs waveform, delivering 13.6 V VC at 50 A IPPM while maintaining <1 μA IR at rated VWM.
Thermal performance is characterized by RθJL = 33 °C/W and RθJA = 100 °C/W on a 5 mm × 5 mm Cu pad PCB, supporting reliable operation up to TJ = 175 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; ensures no conduction during normal 5–8 V system operation. |
| VBR @ IT = 1 mA | 8.89–9.83 V - Breakdown voltage range defining onset of avalanche conduction; tight tolerance supports predictable protection threshold. |
| VC @ IPPM = 50 A | 13.6 V - Clamped voltage under 10/1000 μs surge; limits downstream IC stress to safe levels in 12 V automotive systems. |
| PPPM | 200 W - Peak pulse power handling (10/1000 μs); sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling). |
| IR @ VWM | <1 μA - Reverse leakage at 8.0 V; negligible power loss and signal integrity impact in always-on monitoring circuits. |
| TJ max | 175 °C - Maximum junction temperature; enables deployment in under-hood ECUs and high-ambient environments without derating. |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad; compatible with standard reflow profiles and J-STD-002 solderability requirements. |
Pinout & Package
SMF8.0AH uses the SOD-123W package: a compact, gull-wing leaded surface-mount case with cathode band marking polarity. The device has two terminals: anode and cathode. Thermal performance is optimized via copper pad exposure on the underside of the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward bias or transient conduction | Connected to protected line (e.g., CAN_H); conducts surge current toward ground when clamping activates. |
| Cathode | Current exit point; marked by band | Typically tied to ground or low-impedance return path; defines unidirectional clamping direction from line-to-ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature (-55 °C to +175 °C), vibration, and lifetime reliability requirements. |
| Glass-passivated junction | Ensures stable VBR over time and environmental stress, minimizing parameter drift in harsh under-hood conditions. |
| ISO 7637-2 compliance | Tested against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive noise) - full system-level immunity coverage. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Delivers superior protection margin versus competing TVS devices; reduces risk of downstream IC damage during transients. |
| SOD-123W mechanical robustness | Meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance - suitable for long-life industrial and automotive deployments. |
Applications
| Automotive Body Control Module (BCM) | CAN FD Transceiver Protection |
|---|---|
Use Scenario: Protecting LIN bus slave nodes (e.g., door module sensors) from battery feed transients and load dump events. IC Role / Device Role / Timing Role: Line-to-ground unidirectional TVS clamp placed directly at connector interface before transceiver input. Use Value: Limits voltage seen by LIN transceiver to ≤13.6 V during 200 W surges, preventing latch-up and enabling >100,000-cycle reliability per AEC-Q101. | Use Scenario: Safeguarding CAN FD physical layer transceivers (e.g., TJA1057) against ESD and coupled noise in gateway ECUs. IC Role / Device Role / Timing Role: Bidirectional protection not required; SMF8.0AH provides asymmetric clamping aligned with CAN common-mode voltage swing (0–5 V dominant). Use Value: Achieves <1 μA leakage at 8 V, preserving bus bias stability and meeting ISO 11898-2 common-mode tolerance without signal distortion. |
| Industrial Sensor Interface | Smart Lighting Driver Input Stage |
Use Scenario: Shielding 3.3 V/5 V analog sensor outputs (e.g., pressure, temp) from EFT bursts in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to ADC input pins to suppress fast transients without affecting signal bandwidth. Use Value: Sub-1 μA IR ensures minimal offset error in precision measurement paths; 13.6 V VC prevents ADC saturation during 1 kV EFT testing. | Use Scenario: Protecting constant-current LED driver IC inputs (e.g., AL8863) from 12 V rail surges caused by inductive ballast switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN pin, absorbing energy before it reaches internal LDO and gate drivers. Use Value: 200 W PPPM handles repetitive 12 V load-dump spikes; SOD-123W footprint allows placement within 2 mm of connector for optimal layout efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A (Bourns) | Same VWM (8.0 V), but SMB package (larger footprint, higher RθJA = 125 °C/W); VC = 13.6 V at 52.2 A. | Less suitable for space-constrained automotive modules; requires larger PCB area and thermal relief. | Choose SMBJ8.0A only if legacy board design uses SMB footprint or higher steady-state power (1 W vs. SMF's 1 W, same rating). |
| P6SMB8.0A (ON Semiconductor) | Identical VWM, VBR, VC specs; same SOD-123W package; AEC-Q101 qualified; RθJA = 100 °C/W. | No functional difference; validated for identical ISO 7637-2 pulses and automotive temperature cycling. | P6SMB8.0A is a direct form-fit-function alternative with identical electrical and mechanical specifications - suitable for dual-sourcing. |
Compared with SMBJ8.0A and P6SMB8.0A, the SMF8.0AH offers identical clamping performance and AEC-Q101 compliance in the compact SOD-123W package, but only P6SMB8.0A matches its footprint, thermal resistance, and surge rating exactly - making it the preferred drop-in alternative where second-source assurance is required.
Availability
SMF8.0AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, smart lighting control, and CAN/LIN bus protection requiring stable component supply and AEC-Q101-compliant surge immunity.
Supply support for SMF8.0AH 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and automotive qualification capabilities.
The SMF series was developed specifically for AEC-Q101-compliant transient suppression in 12 V and 24 V automotive subsystems, emphasizing low clamping voltage, high surge robustness, and SMT manufacturability in space-constrained modules.
FAQ
What is the maximum clamping voltage of the SMF8.0AH under a 10/1000 μs surge?
The SMF8.0AH clamps to a maximum of 13.6 V when subjected to a 50 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25°C) and is guaranteed across the full operating temperature range. The low VC ensures protected ICs such as CAN transceivers or microcontrollers remain within safe absolute maximum ratings during surge events. Designers should reference Figure 3 in the SMF8.0AH datasheet for clamping waveform validation.
Is the SMF8.0AH suitable for bidirectional transient protection?
No, the SMF8.0AH is a unidirectional TVS diode and is not rated for bidirectional surge suppression. Its electrical characteristics - including VBR, VC, and IR - are specified only for reverse-biased operation (cathode to positive line). For bidirectional applications like USB or Ethernet, a dedicated bidirectional TVS such as SMAJ8.0CA must be used. Using SMF8.0AH in reverse polarity risks permanent failure or inadequate clamping.
Does the SMF8.0AH meet automotive qualification standards?
Yes, the SMF8.0AH is AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b. It also complies with JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free requirements per IEC 61249-2-21. These qualifications are documented in Taiwan Semiconductor's official SMF5.0AH–SMF100AH datasheet Version A2103.
What is the thermal resistance from junction to ambient for the SMF8.0AH?
The SMF8.0AH has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This value assumes no additional thermal vias or heatsinking. For high-power or high-temperature environments, designers should verify actual board-level thermal performance using thermal simulation or empirical measurement, especially above 125 °C ambient.
Can the SMF8.0AH replace the SMF8.0A in existing designs?
Yes, the SMF8.0AH is a direct replacement for SMF8.0A - both share identical electrical specifications (VWM = 8.0 V, VBR = 8.89–9.83 V, VC = 13.6 V), SOD-123W package, and AEC-Q101 qualification. The "H" suffix denotes halogen-free construction per IEC 61249-2-21, with no impact on performance or layout. No PCB or firmware changes are required when migrating from SMF8.0A to SMF8.0AH.
SMF8.0AH 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 14.7A
- 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
SMF8.0AH FAQ
1.How can I place an order for SMF8.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF8.0AH 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 SMF8.0AH reliable?
The price and inventory of SMF8.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF8.0AH is usually 5 days.
3.What payment methods are accepted for SMF8.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF8.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF8.0AH?
SMF8.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF8.0AH 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 SMF8.0AH?
For technical support, including SMF8.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF8.0AH requirements.
6.How does Aetrix verify that SMF8.0AH is sourced from the original manufacturer or authorized distributors?
All SMF8.0AH 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 SMF8.0AH meets industry standards.
7.What is the process for return or replacement of SMF8.0AH?
All SMF8.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF8.0AH, 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 SMF8.0AH part is unused and in its original packaging.
Return procedure for SMF8.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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