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Taiwan Semiconductor Corporation SMF7.0AH
- Part No.:
- SMF7.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF7.0AH.pdf
- Description:
- 200W, 8.2V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,090
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Product details
Overview
SMF7.0AH from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for automotive-grade circuit protection. It features a 7.0 V working stand-off voltage (VWM), 7.78–8.6 V breakdown voltage (VBR), 12.0 V clamping voltage (VC) at 200 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used to protect automotive lighting control modules against ISO 7637-2 pulses.
For engineers reviewing the SMF7.0AH datasheet, SMF7.0AH pinout, SMF7.0AH application, or SMF7.0AH equivalent, key selection criteria include clamping performance under 200 A transients, low leakage (<1 µA @ 7.0 V), SOD-123W package compatibility with automated placement, and compliance with automotive EFT and load-dump immunity standards.
Technical Context
The SMF7.0AH 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 and long-term reliability under thermal cycling.
It delivers 200 W peak pulse power per IEC 61000-4-5 and ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms, with a maximum clamping voltage of 12.0 V at 200 A and junction temperature range from –55 °C to +175 °C - enabling use in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 7.78 V / 8.6 V - Breakdown occurs within this range at 10 mA test current, defining turn-on consistency |
| VC @ IPPM | 12.0 V - Clamped voltage across device during 200 A 10/1000 µs surge, limiting stress on downstream ICs |
| IR @ VWM | <1 µA - Extremely low reverse leakage preserves battery life in always-on automotive circuits |
| PPPM | 200 W - Peak transient energy absorption capability per standardized 10/1000 µs waveform |
| TJ max | +175 °C - Enables operation near engine control units and other high-temperature zones |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad for improved PCB heat dissipation |
Pinout & Package
SMF7.0AH uses the SOD-123W package: a compact, gull-wing surface-mount outline with cathode band marking polarity. The device has two terminals: anode and cathode. Thermal performance is optimized via a thermally enhanced leadframe design and matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional TVS configuration |
| Cathode | Reverse-bias clamping terminal | Connected to protected line (e.g., 12 V supply rail); cathode band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing |
| Glass-passivated junction | Ensures stable VBR over lifetime and resistance to moisture-induced degradation |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage overshoot during fast transients, improving system-level robustness |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow, reducing manufacturing cost and risk |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) requirements |
Applications
| Automotive Lighting Control | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients in headlamp and tail lamp assemblies. IC Role / Device Role: Unidirectional TVS placed between 12 V supply rail and ground to clamp voltage spikes up to 120 V. Use Value: Limits clamped voltage to 12.0 V at 200 A, preventing damage to 16 V-rated driver ICs while maintaining AEC-Q101 reliability. | Use Scenario: Safeguarding microcontroller power inputs in BCMs exposed to battery line noise and relay switching spikes. IC Role / Device Role: Primary transient suppressor on main 12 V input, upstream of LDOs and PMICs. Use Value: Sub-1 µA leakage at 7.0 V prevents parasitic drain in sleep mode; SOD-123W footprint enables dense layout near connectors. |
| Infotainment System USB Port | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: ESD and EFT protection for USB VBUS lines in vehicle infotainment head units. IC Role / Device Role: Secondary-level TVS after common-mode choke, handling fast transients not filtered upstream. Use Value: 12.0 V clamping ensures USB PHY ICs (rated to 13.2 V) remain within safe operating area during ±8 kV contact ESD events. | Use Scenario: Protecting analog sensor signal lines (e.g., torque sensor) from coupled transients in EPS motor drive circuits. IC Role / Device Role: Low-capacitance unidirectional TVS on 5 V reference or signal rails adjacent to high-current motor drivers. Use Value: 7.0 V VWM allows clean 5 V rail operation; 12.0 V VC prevents latch-up in precision op-amps and ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A | Same VWM (7.0 V), but higher VC = 13.3 V at 200 A; SMA package (larger footprint, higher RθJA) | Less effective clamping margin for 16 V-rated ICs; requires larger PCB area | Choose if legacy SMA footprint is fixed and 1.3 V higher clamping is acceptable |
| 1.5SMC7.0A | Higher PPPM (1500 W), but larger SMC package; VWM = 7.0 V, VC = 12.5 V at 123 A | Over-specified for 200 W needs; unsuitable for space-constrained automotive modules | Prefer only when multi-kW surge immunity is required and board space permits SMC outline |
Compared with SMAJ7.0A and 1.5SMC7.0A, the SMF7.0AH provides tighter clamping (12.0 V vs. 13.3 V/12.5 V), smaller SOD-123W footprint for high-density layouts, and AEC-Q101 qualification out-of-box - making it optimal for new automotive electronics designs where size, clamping precision, and qualification status are critical.
Availability
SMF7.0AH is available at Aetrix Electronics and suitable for automotive lighting control, body control module (BCM) power input, infotainment USB protection, and electric power steering (EPS) sensor interface applications requiring stable component supply and AEC-Q101-compliant transient suppression.
Supply support for SMF7.0AH 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 SMF7.0AH belongs to TSC's AEC-Q101-qualified SMF series of surface-mount TVS diodes, engineered specifically for robust, space-efficient transient protection in automotive power and signal lines.
FAQ
What is the clamping voltage of SMF7.0AH at its rated peak pulse current?
The SMF7.0AH has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current of 200 A with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and ensures downstream ICs see limited overvoltage during surge events. The SMF7.0AH maintains this clamping performance across its full operating temperature range, supporting reliable protection in automotive environments.
Is SMF7.0AH suitable for bidirectional transient protection?
No, the SMF7.0AH is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including breakdown voltage, clamping behavior, and test conditions - apply only to reverse-bias conduction. For bidirectional protection, a dedicated bidirectional part such as SMF7.0A (not SMF7.0AH) must be selected. The "H" suffix in SMF7.0AH explicitly denotes unidirectional construction with enhanced thermal performance in the SOD-123W package.
Does SMF7.0AH meet ISO 7637-2 Pulse 1 and Pulse 3b requirements?
Yes, the SMF7.0AH is specified to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (supply disconnection and switching transients), and Pulse 3a/3b (electrical fast transients) requirements. This compliance is confirmed in the official Taiwan Semiconductor datasheet (Version A2103), and the device's 200 W peak pulse power rating and 12.0 V clamping voltage directly support these test profiles without external derating.
What is the maximum steady-state power dissipation of SMF7.0AH on a standard PCB?
The SMF7.0AH has a steady-state power dissipation (Ptot) of 1 W when mounted on a standard 5 mm × 5 mm copper pad PCB per JESD51-3. This rating assumes TL = 25°C and accounts for thermal resistance from junction to lead (RθJL = 33 °C/W) and junction to ambient (RθJA = 100 °C/W). Exceeding 1 W continuously risks exceeding the +175 °C maximum junction temperature and must be avoided in design.
How is polarity identified on the SMF7.0AH package?
Polarity on the SMF7.0AH is indicated by a cathode band printed on the device body - consistent with standard diode marking convention. In the SOD-123W package, the banded end corresponds to the cathode terminal, which must be connected to the line being protected (e.g., 12 V rail), while the anode connects to ground. This marking is visible under standard optical inspection and aligns with automated optical recognition (AOI) systems used in SMT assembly.
SMF7.0AH 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 16.7A
- 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
SMF7.0AH FAQ
1.How can I place an order for SMF7.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF7.0AH 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 SMF7.0AH reliable?
The price and inventory of SMF7.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF7.0AH is usually 5 days.
3.What payment methods are accepted for SMF7.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF7.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF7.0AH?
SMF7.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF7.0AH 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 SMF7.0AH?
For technical support, including SMF7.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF7.0AH requirements.
6.How does Aetrix verify that SMF7.0AH is sourced from the original manufacturer or authorized distributors?
All SMF7.0AH 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 SMF7.0AH meets industry standards.
7.What is the process for return or replacement of SMF7.0AH?
All SMF7.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF7.0AH, 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 SMF7.0AH part is unused and in its original packaging.
Return procedure for SMF7.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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