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Taiwan Semiconductor Corporation SMF90A
- Part No.:
- SMF90A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF90A.pdf
- Description:
- TVS DIODE 90VWM 146VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:5,026
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Product details
Overview
SMF90A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal paths. It features a 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 waveform), suitable for automotive load-dump and industrial I/O protection.
For engineers reviewing the SMF90A datasheet, SMF90A pinout, SMF90A application, or SMF90A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA @ 90 V), SOD-123W package compatibility with automated assembly, and thermal robustness up to TJ = 175 °C.
Technical Context
The SMF90A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (100–111 V at IT = 1 mA). Its clamping action limits transient voltages to ≤146 V at IPPM = 1.2 A (10/1000 µs), delivering precise overvoltage protection without latch-up or degradation under repetitive surges.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 33 °C/W when mounted on a 5 mm × 5 mm copper pad, enabling reliable operation in ambient temperatures from –55 °C to +175 °C. Its SOD-123W package supports JEDEC-compliant reflow and meets JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min / max | 100 V / 111 V @ IT = 1 mA - Confirmed avalanche onset range for predictable turn-on threshold |
| VC @ IPPM | 146 V @ 1.2 A (10/1000 µs) - Peak clamped voltage limiting downstream circuit stress |
| PPPM | 200 W - Surge energy handling capability per ISO 7637-2 Pulse 3b compliance |
| IR @ VWM | <1 µA - Negligible leakage current preserving system standby power integrity |
| TJ max | +175 °C - Junction temperature limit enabling under-hood or industrial enclosure use |
| Package | SOD-123W - Surface-mount outline with 33 °C/W junction-to-lead thermal resistance |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode band marking polarity. The device has no internal leads or exposed die; terminals are matte tin-plated for solderability per J-STD-002 and meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to ground or lower-potential rail during clamping; defines unidirectional conduction direction |
| Cathode | Reverse-biased input / protected line connection | Connected to the line requiring protection (e.g., 24 V supply rail); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b waveforms - enables direct integration into automotive power networks |
| Low IR leakage | <1 µA @ 90 V - minimizes quiescent current loss in battery-powered systems |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - allows unlimited floor life and standard reflow without baking |
| Halogen-free construction | Complies with IEC 61249-2-21 - satisfies environmental requirements for industrial and consumer end equipment |
| Photo-glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity stress |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rails against load dump transients and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and ground to shunt surge energy before reaching power management ICs. Use Value: Limits voltage to ≤146 V during 200 W pulses, preventing damage to TPS543x regulators and CAN transceivers. | Use Scenario: Safeguarding analog inputs of PLC analog I/O modules from field-wiring induced EFT bursts. IC Role / Device Role / Timing Role: Front-end transient suppressor on 0–10 V or 4–20 mA sensor input traces. Use Value: Clamps fast transients (IEC 61000-4-4) while maintaining <1 µA leakage to preserve ADC accuracy and offset stability. |
| LED Driver Supply Protection | Telecom DC Feeder Protection |
Use Scenario: Securing constant-current LED driver ICs (e.g., LM3409) against inductive kickback from solenoid-controlled dimming circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb stored inductor energy. Use Value: Withstands 10/1000 µs surges up to 200 W without degradation, ensuring >100,000-cycle reliability. | Use Scenario: Protecting PoE-powered devices (IEEE 802.3af/at) from lightning-induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary-level surge suppression on midspan or endpoint DC input stage. Use Value: Meets IEC 61000-4-5 Level 3 (1 kV/2 kA) when used with series impedance, due to low clamping voltage and fast response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A (Bourns) | Same VWM (90 V), higher PPPM (600 W), larger SMB package (RθJA = 50 °C/W) | Better suited for higher-energy surges but requires larger PCB area and different thermal layout | Select SMBJ90A only if system-level testing confirms need for >200 W pulse handling and board space permits SMB footprint |
| P6SMB90A (ON Semiconductor) | Identical VWM (90 V), same SOD-123W-compatible SMB package, slightly higher VC (147 V vs. 146 V) | Functionally interchangeable in most SOD-123W-constrained designs where SMB mounting is acceptable | Choose P6SMB90A if sourcing flexibility is prioritized and SMB footprint is already allocated in layout |
Compared with SMBJ90A and P6SMB90A, the SMF90A offers optimal balance of compact SOD-123W size, 200 W surge rating, and ultra-low leakage-making it preferred for space-constrained automotive and industrial control modules where thermal mass is limited.
Availability
SMF90A is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, LED driver supply safeguarding, and telecom DC feeder surge suppression requiring stable component supply and full traceability.
Supply support for SMF90A 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, with global distribution and AEC-Q101 qualified product lines.
The SMF90A belongs to TSC's SMFxxA family of unidirectional surface-mount TVS diodes engineered specifically for ISO 7637-2-compliant automotive and harsh-environment industrial surge protection with minimal PCB footprint.
FAQ
What is the maximum clamping voltage of the SMF90A under standard test conditions?
The SMF90A has a maximum clamping voltage (VC) of 146 V when subjected to a 10/1000 µs peak pulse current of 1.2 A. This value is measured per JEDEC standards and ensures downstream components experience controlled overvoltage stress during transient events. The SMF90A maintains this clamping performance across its rated junction temperature range (–55 °C to +175 °C), making it suitable for under-hood automotive applications.
Does the SMF90A meet automotive surge immunity standards?
Yes, the SMF90A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms-key standards for automotive electrical system immunity. Its 200 W peak pulse power rating, low clamping voltage, and robust thermal design enable reliable protection of ECUs, body controllers, and infotainment power supplies. The SMF90A is not AEC-Q101 qualified, so qualification testing is recommended for safety-critical automotive functions.
What is the leakage current specification for SMF90A at its working voltage?
The SMF90A exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 90 V working stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves system efficiency in battery-backed or low-power IoT nodes. Leakage remains below 5 µA up to 125 °C, supporting stable operation in industrial temperature environments without compromising standby current budgets.
Can SMF90A be used in bidirectional protection configurations?
No, the SMF90A is a unidirectional TVS diode and must be oriented with cathode toward the protected line and anode to ground. For bidirectional protection (e.g., AC signal lines or data buses), a dedicated bidirectional part such as SMF90CA or paired unidirectional devices are required. Using SMF90A in reverse bias beyond its forward voltage (VF ≈ 3.5 V @ 12 A) risks permanent damage and invalidates its clamping specification.
What is the thermal resistance profile of SMF90A in typical PCB mounting?
When mounted on a standard 5 mm × 5 mm copper pad per JEDEC test conditions, the SMF90A exhibits RθJA = 100 °C/W (junction-to-ambient), RθJL = 33 °C/W (junction-to-lead), and RθJC = 34 °C/W (junction-to-case). These values confirm effective heat transfer through the SOD-123W package leads, supporting continuous operation at up to 1 W steady-state dissipation and enabling use in thermally dense layouts without forced airflow.
SMF90A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF90A FAQ
1.How can I place an order for SMF90A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF90A 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 SMF90A reliable?
The price and inventory of SMF90A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF90A is usually 5 days.
3.What payment methods are accepted for SMF90A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF90A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF90A?
SMF90A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF90A 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 SMF90A?
For technical support, including SMF90A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF90A requirements.
6.How does Aetrix verify that SMF90A is sourced from the original manufacturer or authorized distributors?
All SMF90A 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 SMF90A meets industry standards.
7.What is the process for return or replacement of SMF90A?
All SMF90A units undergo pre-shipment inspection (PSI). If there is an issue with SMF90A, 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 SMF90A part is unused and in its original packaging.
Return procedure for SMF90A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF90A Tags
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