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Taiwan Semiconductor Corporation SMF90AH
- Part No.:
- SMF90AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF90AH.pdf
- Description:
- TVS DIODE 90VWM 146VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:8,405
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Product details
Overview
SMF90AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 90 V working stand-off voltage (VWM), 100–111 V breakdown voltage (VBR), 146 V clamping voltage (VC) at 1.2 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial control circuits against ISO 7637-2 pulses and ESD transients.
For engineers reviewing the SMF90AH datasheet, SMF90AH pinout, SMF90AH application, or SMF90AH equivalent, key selection criteria include clamping performance under 10/1000 µs surge, low leakage (<1 µA @ 90 V), AEC-Q101 qualification, moisture sensitivity level 1 compliance, and SOD-123W footprint compatibility with automated PCB assembly.
Technical Context
The SMF90AH implements a glass-passivated silicon junction optimized for fast response to high-energy transients. Its unidirectional configuration provides forward conduction path with VF = 3.5 V @ 12 A, enabling bidirectional protection when paired with complementary devices or used in DC-biased lines.
Thermal design is supported by RθJL = 33 °C/W and RθJA = 100 °C/W (on 5 mm × 5 mm Cu pad), allowing reliable operation up to TJ = 175 °C. It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min / max | 100 V / 111 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPPM | 146 V - Clamped voltage at 1.2 A peak pulse current (10/1000 µs), limiting stress on downstream ICs |
| PPPM | 200 W - Peak pulse power handling capability under standard 10/1000 µs waveform |
| IR @ VWM | <1 µA - Reverse leakage ensures minimal standby power loss and signal integrity in high-impedance nodes |
| TJ max | 175 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | SOD-123W - Standardized surface-mount outline with matte tin-plated leads and J-STD-002 solderability |
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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; defines polarity for unidirectional clamping |
| Cathode | Clamping output / Surge current sink | Connected to higher-potential rail (e.g., VBAT); conducts surge current to ground or supply during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and ESD |
| Glass-passivated junction | Enhances reliability and stability of VBR over temperature and lifetime vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Withstands defined vehicle electrical transients (Pulse 1/2a/2b/3a/3b) without degradation or failure |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally restricted substances |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12 V power rail in body control modules from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients above 90 V while remaining inactive during normal operation. Use Value: Limits voltage seen by MCU power supply and LIN transceiver to ≤146 V, preventing latch-up or permanent damage per ISO 7637-2 Pulse 2b. | Use Scenario: Safeguarding analog front-end inputs of pressure or temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Placed across sensor signal and ground to shunt ESD and EFT events before they reach precision amplifier inputs. Use Value: Maintains signal integrity with <1 µA leakage at 90 V, avoiding DC offset errors in µA-level sensor bias networks. |
| LED Driver Input Stage Protection | DC Motor Control Board Protection |
Use Scenario: Shielding constant-current LED driver ICs from back-EMF and hot-swap surges in commercial lighting systems. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-input rail to clamp negative-going transients and absorb positive surges. Use Value: Withstands 200 W peak pulse energy without degradation, ensuring long-term reliability in thermally constrained LED housings. | Use Scenario: Protecting H-bridge gate drivers and microcontrollers from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Mounted across motor supply rails (VMOT–GND) to clamp voltage spikes generated by winding inductance. Use Value: Fast clamping response (<1 ns) and 146 V VC limit MOSFET drain-source voltage stress during PWM switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | Same VWM (90 V), but SMA package (larger footprint, RθJA = 110 °C/W), lower PPPM (400 W) | Higher thermal resistance limits power density in compact layouts; requires larger copper area for same derating | Choose SMAJ90A only if board space allows larger SMC/SMA footprint and higher peak power margin is needed |
| P6SMB90A | Same VWM and SOD-123W-compatible SMC package, but non-AEC-Q101, higher IR (5 µA @ 90 V) | Lacks automotive qualification and exhibits 5× higher leakage, unsuitable for low-power sensor nodes | Select P6SMB90A for cost-sensitive industrial applications where AEC-Q101 and sub-µA leakage are not required |
Compared with SMAJ90A and P6SMB90A, the SMF90AH delivers AEC-Q101 assurance, superior thermal performance (RθJA = 100 °C/W), and ultra-low leakage in the space-constrained SOD-123W outline-making it optimal for automotive ECUs and battery-powered edge sensors.
Availability
SMF90AH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, LED driver input stage protection, and DC motor control board protection requiring stable component supply and full traceability.
Supply support for SMF90AH 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 automotive and industrial markets.
The SMF90AH belongs to TSC's AEC-Q101-qualified SMFxxAH family of surface-mount TVS diodes, engineered specifically for robust transient immunity in harsh automotive environments and high-reliability industrial controls.
FAQ
What is the clamping voltage of the SMF90AH under a 10/1000 µs surge?
The SMF90AH clamps to a maximum of 146 V when subjected to its rated peak pulse current of 1.2 A with a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream components such as MCUs or transceivers in automotive and industrial designs using the SMF90AH.
Is the SMF90AH suitable for automotive applications?
Yes, the SMF90AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its SOD-123W package, 175 °C maximum junction temperature, and glass-passivated junction make it appropriate for under-hood and body-control module deployments where the SMF90AH provides certified transient protection.
What is the reverse leakage current specification for the SMF90AH at its working voltage?
The SMF90AH exhibits a maximum reverse leakage current of 1 µA when biased at its 90 V working stand-off voltage (VWM) and tested at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in always-on automotive subsystems relying on the SMF90AH.
Does the SMF90AH have polarity marking, and how is it identified?
Yes, the SMF90AH uses a cathode band to indicate polarity, consistent with SOD-123W industry conventions. The banded end is the cathode terminal, and the unmarked end is the anode. This marking is visible on the device body and aligns with the polarity diagram in the official Taiwan Semiconductor datasheet for the SMF90AH.
What is the thermal resistance from junction to ambient for the SMF90AH?
The SMF90AH has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard 5 mm × 5 mm copper pad per JESD51-3. This value enables accurate thermal modeling in PCB layouts and confirms the SMF90AH's suitability for sustained operation in environments up to 125 °C ambient when properly heatsinked.
SMF90AH 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 1.05A
- 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
SMF90AH FAQ
1.How can I place an order for SMF90AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF90AH 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 SMF90AH reliable?
The price and inventory of SMF90AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF90AH is usually 5 days.
3.What payment methods are accepted for SMF90AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF90AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF90AH?
SMF90AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF90AH 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 SMF90AH?
For technical support, including SMF90AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF90AH requirements.
6.How does Aetrix verify that SMF90AH is sourced from the original manufacturer or authorized distributors?
All SMF90AH 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 SMF90AH meets industry standards.
7.What is the process for return or replacement of SMF90AH?
All SMF90AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF90AH, 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 SMF90AH part is unused and in its original packaging.
Return procedure for SMF90AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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