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Taiwan Semiconductor Corporation SMF15A
- Part No.:
- SMF15A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:5,536
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Product details
Overview
SMF15A 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 15 V working stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR), 24.4 V clamping voltage (VC) at 8.2 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is used in automotive lighting control modules to protect microcontroller I/O pins from load-dump transients.
For engineers reviewing the SMF15A datasheet, SMF15A pinout, SMF15A application, or SMF15A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA @ 15 V), SOD-123W package compatibility with automated placement, and junction temperature range of –55°C to +175°C.
Technical Context
The SMF15A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transient overvoltages. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage, while its thermal design supports 175°C maximum junction temperature and 33°C/W junction-to-lead resistance on standard PCB mounting.
It delivers 24.4 V clamping at 8.2 A (10/1000 µs waveform), enabling robust protection for 12 V automotive systems where load dump can exceed 40 V. The device meets ISO 7637-2 immunity requirements without external series impedance, and its SOD-123W package provides mechanical reliability per JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 16.7 V / 18.5 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 24.4 V - Clamped voltage seen by protected circuit during 8.2 A transient (10/1000 µs) |
| PPPM | 200 W - Peak surge energy handling capability under standardized impulse waveform |
| IR @ VWM | <1 µA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +175°C - Enables operation in under-hood automotive environments without derating |
| RθJL | 33°C/W - Low 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, polarity indicated by cathode band, 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 configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts when transient 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 switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) |
| Low IR <1 µA @ VWM | Minimizes quiescent current draw in always-on automotive circuits such as CAN node power rails |
| SOD-123W footprint | Enables high-density layout and compatibility with standard pick-and-place equipment (JEDEC MS-012 variant) |
| Junction temp range | –55°C to +175°C operation supports engine control units and body electronics without external heatsinking |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs from inductive kickback during PWM dimming in headlamp modules. IC Role / Device Role: Unidirectional TVS placed between supply rail and ground, clamping transients up to 24.4 V. Use Value: Prevents latch-up or gate oxide damage in MOSFET drivers exposed to 100 V load-dump events per ISO 7637-2 Pulse 5a. | Use Scenario: Shielding 4–20 mA analog sensor transmitters from EFT bursts in factory automation panels. IC Role / Device Role: Reverse-biased clamping element across loop supply input to suppress fast transients. Use Value: Maintains signal integrity by limiting voltage excursions to ≤24.4 V during 5 kHz EFT bursts (IEC 61000-4-4 Level 4). |
| USB-C Power Delivery Port | DC Motor Driver Protection |
Use Scenario: Safeguarding USB-C CC and VBUS lines against ESD and hot-swap surges in portable docking stations. IC Role / Device Role: Unidirectional TVS on VBUS rail (15 V nominal) to clamp ±15 kV contact ESD per IEC 61000-4-2. Use Value: Limits clamped voltage to 24.4 V, below absolute maximum ratings of common PD controllers like TPS6598x. | Use Scenario: Suppressing flyback voltage spikes from brushed DC motors in robotic actuators. IC Role / Device Role: Freewheeling TVS across motor terminals to absorb inductive energy during PWM switching. Use Value: Reduces radiated emissions and prevents MOSFET avalanche failure by clamping spikes to 24.4 V at 8.2 A peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ15A | Same VWM (15 V), identical SOD-123 package, but higher VC = 24.9 V and lower PPPM = 400 W (vs. SMF15A's 200 W) | Higher clamping voltage may stress downstream ICs with tighter VDD tolerances; better suited for higher-energy surges | Select SMAJ15A only if system-level surge testing requires >200 W rating and VC margin allows |
| ON Semiconductor 1.5SMC15A | Different package (DO-214AB/SMA), larger footprint, same VWM and VC (24.4 V), but higher IR (≤5 µA vs. <1 µA) | Not compatible with SOD-123W land pattern; higher leakage may impact battery-powered sensor nodes | Choose only when board redesign accommodates SMA package and leakage sensitivity is low |
Compared with SMAJ15A and 1.5SMC15A, the SMF15A offers the lowest leakage (<1 µA), tightest VBR tolerance, and optimal fit for space-constrained automotive PCBs using SOD-123W footprints-without sacrificing clamping performance or ISO 7637-2 compliance.
Availability
SMF15A is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, USB-C power delivery port, and DC motor driver protection requiring stable component supply and full traceability.
Supply support for SMF15A 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 AEC-Q101 qualified product lines.
The SMF15A belongs to TSC's SMF-series unidirectional TVS family, engineered specifically for high-reliability automotive and industrial surge protection where low leakage, precise clamping, and SOD-123W mountability are critical.
FAQ
What is the maximum clamping voltage of the SMF15A under standard test conditions?
The SMF15A has a maximum clamping voltage (VC) of 24.4 V when subjected to an 8.2 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and represents the upper limit of voltage seen by the protected circuit during transient events. It ensures compatibility with 12 V automotive systems and logic-level interfaces that tolerate up to 25 V.
Does the SMF15A meet automotive surge immunity standards?
Yes, the SMF15A meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling). Its 200 W peak pulse power rating and controlled clamping behavior make it suitable for protecting ECUs, lighting modules, and body control units in passenger vehicles and commercial trucks.
What is the reverse leakage current specification for the SMF15A at its working voltage?
The SMF15A exhibits a maximum reverse leakage current (IR) of less than 1 µA when biased at its 15 V working stand-off voltage (VWM) and tested at 25°C. This ultra-low leakage supports energy-sensitive applications such as always-on automotive modules and battery-powered industrial sensors where standby current must be minimized.
Can the SMF15A be used in bidirectional configurations?
No, the SMF15A is a unidirectional TVS diode and is not rated for bidirectional operation. It conducts only in reverse bias above its breakdown voltage. For AC or dual-polarity signal line protection, a dedicated bidirectional part such as SMF15CA must be selected instead of the SMF15A.
What is the thermal resistance from junction to lead for the SMF15A?
The SMF15A 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. This value enables efficient heat dissipation during repetitive transient events and supports reliable operation at junction temperatures up to +175°C without additional heatsinking.
SMF15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- 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
SMF15A FAQ
1.How can I place an order for SMF15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF15A 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 SMF15A reliable?
The price and inventory of SMF15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF15A is usually 5 days.
3.What payment methods are accepted for SMF15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF15A?
SMF15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF15A 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 SMF15A?
For technical support, including SMF15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF15A requirements.
6.How does Aetrix verify that SMF15A is sourced from the original manufacturer or authorized distributors?
All SMF15A 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 SMF15A meets industry standards.
7.What is the process for return or replacement of SMF15A?
All SMF15A units undergo pre-shipment inspection (PSI). If there is an issue with SMF15A, 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 SMF15A part is unused and in its original packaging.
Return procedure for SMF15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF15A Tags
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