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Taiwan Semiconductor Corporation SMF54A
- Part No.:
- SMF54A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF54A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,297
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Product details
Overview
SMF54A from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode in SOD-123W package, rated for 54 V working stand-off voltage (VWM), 60.0–66.3 V breakdown voltage (VBR), and 2.3 A peak pulse current (IPPM) at 10/1000 µs waveform with 87.1 V clamping voltage (VC). It delivers 200 W peak pulse power and operates across –55 °C to +175 °C junction temperature, designed for ESD and inductive switching transient protection in automotive lighting control modules.
For engineers reviewing the SMF54A datasheet, SMF54A pinout, SMF54A application, or SMF54A equivalent, key selection criteria include verified clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low reverse leakage (<1 µA above 10 V), RoHS/halogen-free compliance, and SOD-123W surface-mount compatibility with automated placement.
Technical Context
The SMF54A is a single-die, unidirectional TVS diode optimized for fast clamping of high-energy transients on DC power rails and signal lines. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage, while its thermal design supports 33 °C/W junction-to-lead resistance on standard PCB copper pads.
It meets ISO 7637-2 immunity requirements for automotive electronics, with defined 10/1000 µs waveform response and derating curves for ambient temperatures above 25 °C. The device exhibits no repetitive surge rating limitation and is qualified to JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 60.0 / 66.3 V @ IT = 1 mA - Confirmed breakdown range ensuring reliable turn-on margin over VWM |
| VC @ IPPM | 87.1 V @ 2.3 A - Clamping voltage during 10/1000 µs transient, limiting downstream IC stress |
| PPPM | 200 W - Peak pulse power handling capability per standardized waveform, critical for load dump immunity |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery-powered circuit standby current |
| TJ max | +175 °C - Enables operation in under-hood automotive environments without thermal derating |
| RθJL | 33 °C/W - Junction-to-lead thermal resistance enables effective heat transfer to PCB copper pad |
Pinout & Package
Package: SOD-123W - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, cathode band polarity marking, and 0.016 g mass. Designed for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; defines unidirectional conduction direction |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail); clamps to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| J-STD-020 Level 1 MSL | Zero floor life restriction - can be stored indefinitely before reflow without baking |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting environmental compliance for automotive OEMs |
| Automated placement compatibility | SOD-123W footprint and lead geometry meet pick-and-place machine vision and vacuum nozzle requirements |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp control units subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp on 12 V supply rail, absorbing energy before it reaches sensitive logic. Use Value: Limits rail voltage to ≤87.1 V during 200 W pulses, preventing latch-up or gate oxide damage in downstream ICs. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring surges and relay coil flyback. IC Role / Device Role / Timing Role: Front-end transient suppression on 24 V DC inputs, placed before optocoupler or level-shifter interface. Use Value: Clamps transients within 1 ns response time, maintaining signal integrity and preventing false triggering of input latches. |
| USB-C Power Delivery Port | Smart Meter Communication Interface |
Use Scenario: Protecting CC and VBUS lines in USB-C PD controllers against ESD and hot-swap voltage overshoot. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on VBUS (5–20 V range), referenced to system ground. Use Value: Delivers <1 µA leakage at 54 V standoff, preserving bus quiescent current budget while meeting IEC 61000-4-2 Level 4. | Use Scenario: Shielding RS-485 transceivers in utility smart meters from lightning-induced surges on outdoor communication lines. IC Role / Device Role / Timing Role: Primary protection device on differential bus lines, mounted before common-mode choke. Use Value: Withstands repeated 10/1000 µs surges up to 2.3 A, extending transceiver MTBF in harsh grid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54A (Bourns) | Same VWM (54 V), higher PPPM (600 W), larger SMB package (4.5 × 3.9 mm vs. SOD-123W 2.7 × 1.6 mm) | Preferred where board space allows and higher surge margin is required (e.g., industrial mains input) | Select SMBJ54A only if layout accommodates 2× footprint increase and 600 W rating is needed beyond ISO 7637-2 scope |
| P6SMB54A (ON Semiconductor) | Identical VWM/VBR/VC specs, same SOD-123W package, but rated for 150 W PPPM (vs. 200 W) and lacks ISO 7637-2 documentation | Suitable for non-automotive consumer electronics where full automotive transient compliance is not mandated | Choose P6SMB54A for cost-sensitive designs where 150 W pulse rating suffices and automotive qualification is unnecessary |
Compared with SMBJ54A and P6SMB54A, the SMF54A uniquely balances compact SOD-123W size, 200 W pulse rating, and documented ISO 7637-2 compliance-making it optimal for space-constrained automotive ECUs requiring certified transient immunity without footprint penalty.
Availability
SMF54A is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, USB-C power delivery port hardening, and smart meter communication interface designs requiring stable component supply and full ISO 7637-2 qualification.
Supply support for SMF54A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMF54A belongs to TSC's SMFxxA family of surface-mount TVS diodes engineered specifically for automotive-grade transient suppression, emphasizing low leakage, tight VBR tolerance, and robust ISO 7637-2 immunity in miniaturized packages.
FAQ
What is the maximum clamping voltage of the SMF54A under a 10/1000 µs transient?
The SMF54A has a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current of 2.3 A with a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream components such as microcontrollers or power regulators in the SMF54A-protected circuit.
Does the SMF54A meet automotive transient immunity standards?
Yes, the SMF54A is explicitly tested and compliant with ISO 7637-2 for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling). This certification is documented in Taiwan Semiconductor's official datasheet Version D2103 and confirms suitability for automotive body electronics and lighting control modules.
What is the reverse leakage current specification for the SMF54A at its working voltage?
The SMF54A exhibits a maximum reverse leakage current (IR) of less than 1 µA when biased at its 54 V working stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage supports energy-efficient designs in battery-powered or always-on automotive subsystems where standby current must remain minimal.
Is the SMF54A halogen-free and RoHS compliant?
Yes, the SMF54A is both RoHS compliant and halogen-free per IEC 61249-2-21. These environmental qualifications are confirmed in the official Taiwan Semiconductor datasheet and apply to all units shipped under standard ordering code SMF54A in SOD-123W tape-and-reel packaging.
What is the thermal resistance from junction to lead (RθJL) for the SMF54A?
The SMF54A has a typical junction-to-lead thermal resistance (RθJL) of 33 °C/W when mounted on a standard 5 mm × 5 mm copper pad PCB per JESD51-3. This value enables effective heat dissipation during repetitive transient events and supports reliable operation up to its +175 °C maximum junction temperature rating.
SMF54A 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 2.3A
- 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
SMF54A FAQ
1.How can I place an order for SMF54A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF54A 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 SMF54A reliable?
The price and inventory of SMF54A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF54A is usually 5 days.
3.What payment methods are accepted for SMF54A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF54A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF54A?
SMF54A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF54A 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 SMF54A?
For technical support, including SMF54A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF54A requirements.
6.How does Aetrix verify that SMF54A is sourced from the original manufacturer or authorized distributors?
All SMF54A 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 SMF54A meets industry standards.
7.What is the process for return or replacement of SMF54A?
All SMF54A units undergo pre-shipment inspection (PSI). If there is an issue with SMF54A, 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 SMF54A part is unused and in its original packaging.
Return procedure for SMF54A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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