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Taiwan Semiconductor Corporation SMF7.5AH
- Part No.:
- SMF7.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF7.5AH.pdf
- Description:
- 200W, 8.8V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,725
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Product details
Overview
SMF7.5AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 7.5 V working stand-off voltage, 8.33–9.21 V breakdown voltage at 1 mA, 15.5 V clamping voltage at 100 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial electronics against ESD, load dump, and ISO 7637-2 transients.
For engineers reviewing the SMF7.5AH datasheet, SMF7.5AH pinout, SMF7.5AH application, or SMF7.5AH equivalent, key selection criteria include clamping performance under 100 A surge, low leakage (<1 µA @ 7.5 V), AEC-Q101 qualification, moisture sensitivity level 1, and compatibility with automated SMT assembly on PCBs with 5 mm × 5 mm copper pads.
Technical Context
The SMF7.5AH operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified breakdown range (8.33–9.21 V). Its clamping action limits transient-induced voltage to ≤15.5 V at 100 A, enabling robust protection of downstream ICs such as CAN transceivers or microcontrollers.
Thermal design relies on its 33 °C/W junction-to-lead resistance and 100 °C/W junction-to-ambient rating (measured on 5 mm × 5 mm Cu pad), supporting continuous operation up to 175 °C junction temperature. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b and is qualified per AEC-Q101 for automotive under-hood use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum DC or continuous reverse operating voltage before clamping begins |
| VBR min/max | 8.33 V / 9.21 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on above system nominal voltage |
| VC @ IPPM | 15.5 V @ 100 A - Peak clamped voltage during 10/1000 µs surge; defines maximum stress on protected circuit |
| PPPM | 200 W - Peak pulse power handling capability; supports high-energy transients per ISO 7637-2 |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on systems |
| TJ max | +175 °C - Enables placement near heat sources in engine control units and lighting modules |
| Package | SOD-123W - Surface-mount outline with matte tin-plated leads; compatible with J-STD-002 soldering and JESD 201 Class 2 whisker testing |
Pinout & Package
SMF7.5AH uses the SOD-123W package: a compact, rectangular surface-mount case with cathode band marking polarity. Leads are matte tin-plated and compliant with J-STD-002 solderability requirements. Weight is 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to ground or lower-potential node in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, LIN, 12V rail); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| Clamping voltage ≤15.5 V @ 100 A | Ensures protected ICs (e.g., TJA1042, TCAN1042) remain within absolute maximum ratings during load dump |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow, reducing manufacturing overhead |
| Photo glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity stress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Meets full suite of automotive transient immunity requirements without external filtering components |
Applications
| Automotive CAN Bus Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TCAN1042H) from battery line transients during ignition and load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L and chassis ground to clamp coupled surges. Use Value: Limits voltage excursion to ≤15.5 V, preventing latch-up or permanent damage to transceiver I/O cells while maintaining signal integrity. | Use Scenario: Safeguarding buck controller ICs (e.g., LM34927) driving high-brightness LED arrays in automotive headlamps. IC Role / Device Role / Timing Role: Placed across input supply rail to absorb inductive kickback from relay switching and alternator ripple. Use Value: Withstands 200 W peak pulses and maintains <1 µA leakage, avoiding quiescent current drain in always-on lighting modules. |
| Industrial PLC Digital Input Protection | Automotive LIN Bus Node Protection |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Connected between input terminal and common reference to shunt fast transients before reaching optocoupler or MCU GPIO. Use Value: Clamps 100 A pulses to 15.5 V within nanoseconds, preserving input threshold margins and enabling direct interface with 3.3 V/5 V logic. | Use Scenario: Securing LIN transceivers (e.g., TLE7259-3GE) in door modules and seat control units against battery disconnection spikes. IC Role / Device Role / Timing Role: Mounted on LIN bus line to suppress ISO 7637-2 Pulse 2b (battery disconnect) transients. Use Value: AEC-Q101 qualification and 175 °C TJ max ensure stable operation in confined, thermally stressed cabin environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.5A | Same SOD-123 package, 7.5 V VWM, but 200 W PPPM at 10/1000 µs and 16.7 V VC @ 100 A - 1.2 V higher clamping than SMF7.5AH | Higher clamping voltage may require margin check for low-voltage 5 V tolerant receivers | Preferred where legacy Littelfuse footprint compatibility is required; verify VC margin with protected IC's absolute max rating |
| Vishay SMA6J7.5A | SOD-123 package, 7.5 V VWM, 200 W PPPM, but 16.5 V VC @ 100 A and no AEC-Q101 documentation in public datasheet | Lacks automotive qualification evidence; suitable for industrial but not safety-critical automotive designs | Select only for cost-sensitive non-automotive applications; avoid where AEC-Q101 traceability is mandated |
Compared with SMAJ7.5A and SMA6J7.5A, SMF7.5AH delivers the lowest clamping voltage (15.5 V) among SOD-123 7.5 V TVS diodes and is explicitly AEC-Q101 qualified - critical for CAN/LIN nodes where voltage margin and automotive compliance are non-negotiable.
Availability
SMF7.5AH is available at Aetrix Electronics and suitable for automotive CAN bus protection, LED headlamp driver circuits, industrial PLC digital inputs, and LIN bus node protection requiring stable component supply across production lifecycles.
Supply support for SMF7.5AH 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, with global distribution and AEC-Q101-compliant product lines.
The SMF7.5AH belongs to TSC's SMFxAH family of automotive-grade unidirectional TVS diodes, engineered specifically for ISO 7637-2 transient immunity in 12 V and 24 V vehicle electrical systems.
FAQ
What is the breakdown voltage range of SMF7.5AH?
The SMF7.5AH has a guaranteed breakdown voltage range of 8.33 V to 9.21 V at 1 mA test current, measured per JEDEC standards. This range ensures consistent avalanche initiation above the 7.5 V working stand-off voltage while accommodating process variation. The specification is validated per AEC-Q101 stress testing and appears in the official Taiwan Semiconductor datasheet revision A2103.
Is SMF7.5AH suitable for automotive applications?
Yes, SMF7.5AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its SOD-123W package, 175 °C maximum junction temperature, and moisture sensitivity level 1 make it appropriate for under-hood and cabin automotive modules including body control units and lighting drivers.
What is the clamping voltage of SMF7.5AH at 100 A?
The SMF7.5AH clamps to a maximum of 15.5 V at 100 A peak pulse current with a 10/1000 µs waveform. This value is measured and guaranteed per datasheet Table "ELECTRICAL SPECIFICATIONS" and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SMF7.5AH have polarity marking?
Yes, SMF7.5AH features a cathode band printed on the device body to indicate polarity. In the SOD-123W package, the banded end corresponds to the cathode terminal, which must be connected toward the line being protected (e.g., CAN_H or 12 V rail), while the anode connects to ground or return.
What is the thermal resistance from junction to lead for SMF7.5AH?
The junction-to-lead thermal resistance (RθJL) of SMF7.5AH is 33 °C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC JESD51-14. This parameter enables accurate thermal modeling when estimating junction temperature rise under steady-state power dissipation or repetitive pulse conditions.
SMF7.5AH 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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
SMF7.5AH FAQ
1.How can I place an order for SMF7.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF7.5AH 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 SMF7.5AH reliable?
The price and inventory of SMF7.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF7.5AH is usually 5 days.
3.What payment methods are accepted for SMF7.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF7.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF7.5AH?
SMF7.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF7.5AH 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 SMF7.5AH?
For technical support, including SMF7.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF7.5AH requirements.
6.How does Aetrix verify that SMF7.5AH is sourced from the original manufacturer or authorized distributors?
All SMF7.5AH 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 SMF7.5AH meets industry standards.
7.What is the process for return or replacement of SMF7.5AH?
All SMF7.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF7.5AH, 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 SMF7.5AH part is unused and in its original packaging.
Return procedure for SMF7.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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