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Taiwan Semiconductor Corporation SMF58A
- Part No.:
- SMF58A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF58A.pdf
- Description:
- TVS DIODE 58VWM 95VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,240
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Product details
Overview
SMF58A 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 58 V working stand-off voltage (VWM), 64.4–71.2 V breakdown voltage (VBR), 95 V clamping voltage (VC) at 2.1 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is used in automotive body electronics, industrial I/O modules, and USB port protection.
For engineers reviewing the SMF58A datasheet, SMF58A pinout, SMF58A application, or SMF58A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA above 10 V), SOD-123W package compatibility with automated placement, and junction temperature range of –55°C to +175°C.
Technical Context
The SMF58A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transients. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its thermal resistance (RθJL = 33°C/W) supports reliable operation under repeated surge stress on standard PCB copper pads.
It meets ISO 7637-2 immunity requirements for automotive electronics and delivers consistent clamping response across –55°C to +175°C junction temperature, with derated peak power above 25°C ambient per Fig.2. The device is rated for single-die configuration in SOD-123W, polarity indicated by cathode band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 64.4 V / 71.2 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 95 V - Clamped voltage at 2.1 A peak pulse current (10/1000 µs); determines protected circuit's maximum transient exposure |
| PPPM | 200 W - Peak pulse power handling capability; validates robustness against ISO 7637-2 Pulse 1/2a/2b/3a/3b surges |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss in battery-powered systems |
| TJ max | +175°C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments |
| Package | SOD-123W - Surface-mount package with matte tin-plated leads, J-STD-002 solderable, MSL Level 1 |
Pinout & Package
SOD-123W package: 2-terminal surface-mount device with cathode band marking polarity; case meets UL 94V-0 flammability rating; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-bias clamping terminal | Connected to protected line (e.g., 12 V rail or data line); clamps when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and <1 µA IR at VWM, critical for precision rail protection |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), enabling direct use in automotive ECUs |
| Low thermal resistance (RθJL = 33°C/W) | Enables efficient heat transfer to PCB copper pad, supporting >1000 surge events without degradation under defined test conditions |
| Halogen-free & RoHS compliant | Fulfills IEC 61249-2-21 and EU RoHS directives, required for export to EU, Japan, and China markets |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 12 V supply rail and LIN bus lines from load dump and inductive switching spikes in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and ground, clamping transients within 1 ns response time. Use Value: Limits voltage excursion to ≤95 V during ISO 7637-2 Pulse 1 (−100 V/0.5 Ω), preventing damage to MCU and LIN transceivers. | Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and EFT bursts in factory automation controllers. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, shunting energy before it reaches optocoupler input stage. Use Value: Withstands 200 W (10/1000 µs) pulses and maintains <1 µA leakage at 24 V, ensuring no false triggering during normal operation. |
| USB 2.0 Port Protection | Smart Lighting Driver Power Rail |
Use Scenario: Guarding D+ and D− lines in embedded USB host ports against human-body-model (HBM) ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed inline with data lines, referenced to system ground. Use Value: Clamps 8 kV HBM ESD to <20 V within nanoseconds, preserving signal integrity and meeting IEC 61000-4-2 Level 4 requirements. | Use Scenario: Suppressing MOSFET-switching-induced voltage spikes on the 48 V DC bus feeding LED drivers in streetlight systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, absorbing inductive kickback from high-side switch turn-off. Use Value: Handles repetitive 200 W surges with TJ ≤175°C, extending driver lifetime in thermally constrained outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ58A | Same VWM (58 V), identical SOD-123 package, but higher VC = 93.6 V at 2.15 A; RθJA = 110°C/W vs. SMF58A's 100°C/W | Marginally tighter clamping; slightly lower thermal efficiency on same PCB layout | Preferred where sub-94 V clamping is mandatory; verify layout thermal margin |
| ON Semiconductor SMCJ58A | Higher PPPM (1500 W), DO-214AB package (larger footprint), VWM = 58 V, VC = 93.6 V at 16.3 A | Designed for higher-energy surges; incompatible pinout and board space | Select only when >200 W surge immunity is required and SOD-123W size constraint is relaxed |
Compared with SMAJ58A and SMCJ58A, the SMF58A offers optimal balance of compact SOD-123W footprint, 200 W surge rating, and 95 V clamping-making it ideal for space-constrained automotive and industrial PCBs where standardized TVS performance suffices without over-engineering.
Availability
SMF58A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, and USB interface protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF58A 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, serving global automotive, industrial, and consumer markets since 1979.
The SMF58A belongs to TSC's SMF series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in automotive and industrial environments where ISO 7637-2 compliance, thermal robustness, and automated assembly compatibility are mandatory.
FAQ
What is the clamping voltage of SMF58A at its rated peak pulse current?
The SMF58A has a maximum clamping voltage (VC) of 95 V when subjected to its rated peak pulse current (IPPM) of 2.1 A under a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream ICs see no more than 95 V during surge events. The clamping performance is guaranteed across the full operating temperature range of –55°C to +175°C, making SMF58A suitable for under-hood automotive applications where thermal stability is critical.
Is SMF58A unidirectional or bidirectional, and how is polarity identified?
The SMF58A is a unidirectional TVS diode, meaning it clamps only in reverse bias and conducts forward like a standard diode. Polarity is marked by a cathode band on the SOD-123W package body-this band must be oriented toward the higher-potential side (e.g., protected line) during PCB layout. The anode connects to ground or return path. This configuration ensures proper clamping action without forward conduction during normal operation, preserving signal integrity in DC-coupled circuits.
Does SMF58A meet automotive surge immunity standards?
Yes, the SMF58A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation. Its 200 W peak pulse power rating, low clamping voltage, and stable VBR across temperature make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies without additional external filtering.
What is the maximum steady-state power dissipation for SMF58A?
The SMF58A has a steady-state power dissipation (Ptot) of 1 W at lead temperature (TL) = 25°C when mounted on a 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This rating applies only to continuous DC or low-frequency operation-not transient events. For surge protection, the device relies on its 200 W peak pulse rating (10/1000 µs), not Ptot. Designers must ensure thermal layout supports sustained power if used in linear regulation or high-duty-cycle scenarios.
How does SMF58A compare to SMF60A in terms of electrical parameters?
The SMF58A has a VWM of 58 V and VBR range of 64.4–71.2 V, while SMF60A specifies VWM = 60 V and VBR = 66.7–73.7 V. Both share identical PPPM (200 W), VC (96.8 V for SMF60A), and package (SOD-123W). The SMF58A offers tighter clamping margin relative to its VWM, making it preferable where 58 V nominal rails require minimal overvoltage headroom-e.g., legacy 12 V automotive systems with wider tolerance bands. SMF58A remains functionally interchangeable with SMF60A only if system design accommodates the 2 V VWM difference.
SMF58A 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):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 95V
- Current - Peak Pulse (10/1000µs):
- 2.1A
- 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
SMF58A FAQ
1.How can I place an order for SMF58A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF58A 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 SMF58A reliable?
The price and inventory of SMF58A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF58A is usually 5 days.
3.What payment methods are accepted for SMF58A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF58A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF58A?
SMF58A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF58A 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 SMF58A?
For technical support, including SMF58A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF58A requirements.
6.How does Aetrix verify that SMF58A is sourced from the original manufacturer or authorized distributors?
All SMF58A 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 SMF58A meets industry standards.
7.What is the process for return or replacement of SMF58A?
All SMF58A units undergo pre-shipment inspection (PSI). If there is an issue with SMF58A, 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 SMF58A part is unused and in its original packaging.
Return procedure for SMF58A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF58A Tags
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