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Taiwan Semiconductor Corporation SMF14A
- Part No.:
- SMF14A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:7,885
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Product details
Overview
SMF14A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V clamping voltage (VC) at 8.6 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial power rails against ESD and load-dump transients.
For engineers reviewing the SMF14A datasheet, SMF14A pinout, SMF14A application, or SMF14A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA @ 14 V), UL 94V-0 molding compound, J-STD-020 Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5 mm × 5 mm copper pads.
Technical Context
The SMF14A 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 the SOD-123W package provides thermal resistance of RθJL = 33 °C/W and RθJA = 100 °C/W on standard PCB mounting.
Designed for single-pulse suppression per IEC 61000-4-2 (ESD) and ISO 7637-2 (automotive transients), it delivers 23.2 V clamping at 8.6 A IPPM with <1 µA IR at 14 V - enabling robust protection without loading normal operating circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR min/max | 15.6 V / 17.2 V - guaranteed avalanche onset range at 1 mA test current; ensures predictable turn-on across temperature and lot variation |
| VC @ IPPM | 23.2 V at 8.6 A - peak clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPPM | 200 W - peak pulse power handling capability; supports high-energy transients like ISO 7637-2 Pulse 5a (load dump) |
| IR @ VWM | <1 µA - negligible leakage at rated stand-off voltage; avoids power loss or false triggering in battery-powered systems |
| TJ max | +175 °C - maximum junction temperature rating; enables operation in under-hood automotive environments |
| Package | SOD-123W - surface-mount outline with matte tin-plated leads, UL 94V-0 flammability, and JESD201 Class 2 whisker resistance |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode band marking polarity. The device has no internal pins; terminals are anode (unmarked end) and cathode (banded end).
| 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 | Avalanche clamping terminal | Connected to protected line (e.g., 12 V rail); conducts reverse current when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures ±5% VBR tolerance and stable leakage performance over 1000-hour HTOL life testing |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) waveforms |
| J-STD-020 Level 1 moisture sensitivity | Enables unlimited floor life and reflow compatibility without baking prior to assembly |
| UL 94V-0 molding compound | Meets flame-retardant safety requirements for automotive and industrial enclosures |
| Automated placement compatibility | Optimized lead geometry and coplanarity support >99.9% placement yield on high-speed pick-and-place machines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump transients up to 40 V during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to 23.2 V at 8.6 A, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. | Use Scenario: 4–20 mA current-loop sensors in factory automation subject to ESD events from operator contact or relay switching. IC Role / Device Role / Timing Role: TVS mounted across sensor supply terminals to shunt fast transients (<1 ns rise time) before reaching analog front-end amplifiers. Use Value: Sub-µA leakage preserves loop accuracy; 23.2 V clamping prevents saturation of op-amps with ±15 V rails. |
| LED Driver Overvoltage Clamping | USB Port ESD Suppression |
Use Scenario: Constant-current LED drivers in vehicle lighting subjected to ISO 7637-2 Pulse 2b (battery jump-start spikes). IC Role / Device Role / Timing Role: TVS placed at driver input to absorb 100 ms, 25 V transients without thermal runaway. Use Value: 200 W peak power rating and +175 °C TJ max allow sustained clamping without degradation during repeated pulses. | Use Scenario: USB 2.0 data lines in automotive infotainment head units exposed to IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Not applicable - SMF14A is rated for power-line protection only; not designed for signal-line capacitance-sensitive applications. Use Value: Junction capacitance unspecified in datasheet; use dedicated low-C TVS (e.g., USB-ESD variants) for data line protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Same VWM (14 V), but SMA package (larger footprint, RθJA = 60 °C/W vs. 100 °C/W), 400 W PPPM rating | Higher power handling suits higher-energy transients; larger size may conflict with dense PCB layouts | Select SMAJ14A when surge energy exceeds 200 W or board space allows larger package |
| P6SMB14A | Same VWM (14 V), DO-214AA package, 600 W PPPM, higher VC (23.2 V same, but higher IPPM = 25.8 A) | Designed for higher-current industrial surge standards (IEC 61000-4-5); less suitable for space-constrained automotive modules | Choose P6SMB14A for mains-connected equipment requiring 6 kV/3 kA surge immunity |
Compared with SMAJ14A and P6SMB14A, the SMF14A offers optimal balance of compact SOD-123W footprint, automotive-grade thermal performance, and ISO 7637-2 compliance - making it preferred for space-limited 12 V rail protection where 200 W pulse capability suffices.
Availability
SMF14A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and LED lighting drivers requiring stable component supply with full traceability and lifecycle management.
Supply support for SMF14A 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade production.
The SMF series was developed specifically for surface-mount transient suppression in automotive and industrial environments, emphasizing reliability under ISO 7637-2 stress, tight VBR tolerance, and compatibility with lead-free reflow profiles.
FAQ
What is the maximum clamping voltage of the SMF14A under standard test conditions?
The SMF14A has a maximum clamping voltage (VC) of 23.2 V when subjected to an 8.6 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and reflects worst-case clamping performance across manufacturing lot and temperature extremes. The SMF14A maintains this clamping level consistently due to its tightly controlled avalanche characteristics and glass-passivated junction.
Does the SMF14A meet automotive transient immunity standards?
Yes, the SMF14A meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/jump-start), and Pulse 3a/3b (capacitive coupling). Its 200 W peak pulse power rating, low clamping voltage, and specified performance across -55°C to +175°C junction temperature ensure robustness in automotive power networks. The SMF14A is widely deployed in BCMs and lighting modules for this reason.
What is the reverse leakage current specification for the SMF14A at its working voltage?
The SMF14A exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 14 V working stand-off voltage (VWM) and tested at 25°C. This ultra-low leakage ensures minimal power drain in always-on automotive circuits and avoids false triggering in precision sensing applications. The SMF14A maintains IR < 1 µA up to 10 V above VWM, supporting reliable long-term operation.
Is the SMF14A compatible with lead-free reflow soldering processes?
Yes, the SMF14A is fully compatible with lead-free reflow soldering per J-STD-020. Its SOD-123W package features matte tin-plated leads qualified for peak temperatures up to 260°C, and its moisture sensitivity level is rated J-STD-020 Level 1 - meaning it can be stored indefinitely at ambient conditions without baking. The SMF14A has been validated across multiple reflow profiles used in automotive electronics manufacturing.
How does the SMF14A differ from the SMAJ14A in terms of thermal performance?
The SMF14A has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W on a 5 mm × 5 mm Cu pad, while the SMAJ14A (in SMA package) achieves 60 °C/W under identical conditions. This means the SMAJ14A dissipates heat more efficiently, allowing higher steady-state power handling. However, the SMF14A's smaller SOD-123W footprint makes it preferable where board space is constrained - and both parts share identical VWM, VBR, and VC specs. The SMF14A remains thermally sufficient for most automotive pulse-only applications.
SMF14A 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- 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
SMF14A FAQ
1.How can I place an order for SMF14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14A 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 SMF14A reliable?
The price and inventory of SMF14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14A is usually 5 days.
3.What payment methods are accepted for SMF14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14A?
SMF14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14A 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 SMF14A?
For technical support, including SMF14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14A requirements.
6.How does Aetrix verify that SMF14A is sourced from the original manufacturer or authorized distributors?
All SMF14A 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 SMF14A meets industry standards.
7.What is the process for return or replacement of SMF14A?
All SMF14A units undergo pre-shipment inspection (PSI). If there is an issue with SMF14A, 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 SMF14A part is unused and in its original packaging.
Return procedure for SMF14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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