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Taiwan Semiconductor Corporation SMF5.0AH
- Part No.:
- SMF5.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF5.0AH.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:40,945
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Product details
Overview
SMF5.0AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.0 V breakdown voltage (VBR), 21.7 V clamping voltage (VC) at 800 A peak pulse current, and 200 W peak pulse power (10/1000 µs waveform). It is used to protect sensitive ICs and microcontrollers against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMF5.0AH datasheet, SMF5.0AH pinout, SMF5.0AH application, or SMF5.0AH equivalent, key selection criteria include its SOD-123W package, AEC-Q101 qualification, sub-1 µA reverse leakage above 10 V, 175 °C maximum junction temperature, and compliance with ISO 7637-2 and J-STD-020 moisture sensitivity level 1.
Technical Context
The SMF5.0AH operates as a unidirectional clamping device with photo-glass passivated junction for stable breakdown behavior under repetitive surge stress. Its low clamping ratio (VC/VBR ≈ 3.1–3.4) ensures effective overvoltage limiting during fast transients while maintaining low forward voltage drop (VF = 3.5 V @ 12 A).
Thermal performance is defined by RθJL = 33 °C/W and RθJA = 100 °C/W on a 5 mm × 5 mm copper pad PCB, supporting reliable operation up to 175 °C junction temperature. It meets automotive-grade reliability per AEC-Q101 and electrical fast transient immunity per IEC 61000-4-4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 6.4 V / 7.0 V @ IT = 10 mA - Ensures predictable turn-on threshold across production lot |
| VC @ IPPM | 21.7 V @ 800 A (10/1000 µs) - Limits downstream voltage to safe levels during worst-case surge |
| PPPM | 200 W - Supports robust protection against ISO 7637-2 Pulse 1 and Pulse 2b events |
| IR @ VWM | < 5 µA - Minimizes standby power loss in battery-powered systems |
| TJ max | +175 °C - Enables use in under-hood automotive environments without derating |
| Package | SOD-123W - Surface-mount footprint compatible with automated assembly and high thermal dissipation |
Pinout & Package
SMF5.0AH uses the SOD-123W surface-mount package with two terminals: anode and cathode. Polarity is indicated by a cathode band on the device body. The package features matte tin-plated leads, UL 94V-0 molding compound, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Current exit point in forward bias; clamping node in reverse bias | Connected to protected line (e.g., CAN_H, LIN, 12 V rail); absorbs surge energy when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment systems |
| Photo-glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Clamping voltage ≤ 21.7 V @ 800 A | Provides margin below typical 24 V system overvoltage thresholds and IC absolute maximum ratings |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
| ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b) | Meets OEM-level automotive transient immunity requirements for 12 V and 24 V networks |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in vehicle ECUs from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and local regulator or microcontroller VDD. Use Value: Limits voltage excursion to ≤21.7 V during 800 A pulses, preventing latch-up or permanent damage to downstream LDOs and MCUs. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) connected to PLC I/O modules. IC Role / Device Role / Timing Role: Reverse-biased TVS on signal line to shunt ESD and EFT events before reaching precision amplifier input stage. Use Value: Sub-1 µA leakage at 5 V ensures no measurable offset error in µA-level sensor current loops. |
| LED Lighting Driver Protection | Automotive LIN Bus Line Protection |
Use Scenario: Shielding constant-current LED drivers from flyback spikes generated by MOSFET switching. IC Role / Device Role / Timing Role: TVS placed across driver output to absorb inductive kickback energy. Use Value: 200 W peak pulse rating handles repeated 10/1000 µs surges without degradation, extending driver lifetime. | Use Scenario: Adding transient immunity to LIN bus physical layer in door modules and seat controllers. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN data line referenced to battery ground. Use Value: Clamping voltage of 21.7 V stays well below LIN transceiver's 40 V absolute max rating while preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Same SOD-123 package, but rated for 400 W PPPM (10/1000 µs); higher VC = 14.4 V at 43.3 A | Higher power handling suits less frequent but more severe surges; lower clamping ratio improves protection margin | Select SMAJ5.0A when system-level testing reveals >200 W surge energy or when tighter VC/VBR ratio is required |
| P6SMB5.0A | DO-214AA (SMB) package; larger footprint and higher thermal mass; VC = 14.4 V @ 43.3 A; same VWM/VBR | Preferred where board space allows and higher steady-state power dissipation (1.5 W) is needed | Choose P6SMB5.0A for industrial power supplies requiring longer surge duration support or improved thermal stability |
Compared with SMAJ5.0A and P6SMB5.0A, the SMF5.0AH delivers optimized balance of compact SOD-123W footprint, AEC-Q101 qualification, and ISO 7637-2 compliance-making it preferred for space-constrained automotive modules where qualification and standard test coverage are mandatory.
Availability
SMF5.0AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and LED driver surge mitigation requiring stable component supply and full traceability.
Supply support for SMF5.0AH 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 for automotive, industrial, and consumer markets.
The SMF series was developed specifically for AEC-Q101-compliant, surface-mount transient suppression in 12 V/24 V automotive networks-emphasizing low clamping voltage, high surge robustness, and compatibility with automated SMT lines.
FAQ
What is the clamping voltage of SMF5.0AH at its rated peak pulse current?
The SMF5.0AH has a maximum clamping voltage (VC) of 21.7 V when subjected to an 800 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions per IEC 61000-4-5 and is critical for ensuring downstream components remain within their absolute maximum voltage ratings during surge events. The SMF5.0AH maintains this clamping performance across its specified junction temperature range of –55 °C to +175 °C.
Is SMF5.0AH qualified for automotive applications?
Yes, SMF5.0AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. Its construction-including photo-glass passivated junction, SOD-123W package with matte tin plating, and moisture sensitivity level 1-supports reliable operation in automotive under-hood and cabin environments. The SMF5.0AH datasheet confirms qualification status in Version A2103 documentation.
What is the reverse leakage current specification for SMF5.0AH at its working voltage?
At its working stand-off voltage (VWM) of 5.0 V, the SMF5.0AH exhibits a maximum reverse leakage current (IR) of 5 µA at 25 °C. When biased above 10 V, typical IR drops below 1 µA-ensuring minimal power loss in always-on circuits such as automotive body control modules or battery-monitoring systems. This low leakage supports extended battery life in low-power applications.
Does SMF5.0AH have polarity marking, and how is it identified?
Yes, SMF5.0AH uses a cathode band to indicate polarity on the SOD-123W package body. The banded end corresponds to the cathode terminal, which must be connected toward the protected line (e.g., 12 V rail or signal line), while the anode connects to ground or reference potential. This unidirectional configuration ensures proper clamping action during positive-going transients. The marking code "2W5P0" is laser-printed adjacent to the cathode band.
What is the thermal resistance profile of SMF5.0AH, and how does it affect PCB layout?
The SMF5.0AH has a junction-to-lead thermal resistance (RθJL) of 33 °C/W and junction-to-ambient resistance (RθJA) of 100 °C/W when mounted on a 5 mm × 5 mm copper pad. To maintain safe junction temperatures during repetitive surges, designers should implement minimum 5 mm² copper pour connected to both terminals, avoid narrow traces, and ensure adequate airflow or thermal relief in enclosed enclosures. These values are validated per JEDEC test board standards.
SMF5.0AH 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF5.0AH FAQ
1.How can I place an order for SMF5.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF5.0AH 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 SMF5.0AH reliable?
The price and inventory of SMF5.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF5.0AH is usually 5 days.
3.What payment methods are accepted for SMF5.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF5.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF5.0AH?
SMF5.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF5.0AH 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 SMF5.0AH?
For technical support, including SMF5.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF5.0AH requirements.
6.How does Aetrix verify that SMF5.0AH is sourced from the original manufacturer or authorized distributors?
All SMF5.0AH 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 SMF5.0AH meets industry standards.
7.What is the process for return or replacement of SMF5.0AH?
All SMF5.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF5.0AH, 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 SMF5.0AH part is unused and in its original packaging.
Return procedure for SMF5.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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