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Taiwan Semiconductor Corporation SMF64AH
- Part No.:
- SMF64AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF64AH.pdf
- Description:
- TVS DIODE 64VWM 103VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:19,500
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Product details
Overview
SMF64AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, with 64 V working stand-off voltage (VWM), 71.1–78.6 V breakdown voltage (VBR), 103 V clamping voltage (VC) at 1.7 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and designed for automotive ESD and load-dump protection in power-line interfaces.
For engineers reviewing the SMF64AH datasheet, SMF64AH pinout, SMF64AH application, or SMF64AH equivalent, key selection criteria include its ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1 µA reverse leakage above 10 V, 175 °C max junction temperature, SOD-123W thermal performance (RθJA = 100 °C/W), and unidirectional clamping behavior for DC-biased lines.
Technical Context
The SMF64AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (71.1–78.6 V), clamping transients to ≤103 V at IPPM = 1.7 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA @ 64 V).
Designed for automotive-grade reliability, it meets AEC-Q101 stress tests and ISO 7637-2 immunity requirements for pulses 1 (inductive switch-off), 2a/2b (battery connection/disconnection), and 3a/3b (capacitive coupling). Thermal design relies on its SOD-123W footprint with RθJL = 33 °C/W and RθJC = 34 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT = 1 mA | 71.1–78.6 V - Breakdown threshold range defining reliable avalanche onset |
| VC @ IPPM = 1.7 A | 103 V - Clamped voltage during 10/1000 µs transient, limiting downstream stress |
| PPPM | 200 W - Peak surge power handling capability under standardized waveform |
| IR @ VWM | <1 µA - Minimal leakage current ensuring negligible standby power loss |
| TJ max | 175 °C - Enables operation in under-hood automotive environments |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad and J-STD-020 Level 1 moisture rating |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode band marking polarity. The device has no internal circuitry beyond the single silicon die; terminals are anode and cathode, with cathode identified by a visible band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., ground or return path) |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side (e.g., 12 V supply rail); clamps transients toward anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime stress conditions |
| Glass-passivated junction | Ensures stable VBR over time and improved resistance to environmental contamination |
| ISO 7637-2 compliance | Guarantees robustness against real-world automotive transients including load dump and inductive switching |
| Low IR <1 µA @ VWM | Minimizes quiescent current draw in always-on vehicle subsystems (e.g., CAN bus nodes) |
| SOD-123W thermal performance | RθJA = 100 °C/W enables 1 W steady-state dissipation on standard PCB copper pads |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in body control modules from load-dump spikes up to 35 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and system input filter, clamping surges before LDOs or microcontrollers. Use Value: Limits voltage to ≤103 V during 200 W transients, preventing latch-up or permanent damage to downstream PMICs and MCUs. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in factory automation equipment exposed to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point, shunting fast transients before signal conditioning op-amps. Use Value: Sub-1 µA leakage avoids DC offset errors; 103 V clamping preserves ADC reference integrity during 1 kV/5 kHz EFT events. |
| LED Lighting Driver Protection | Automotive CAN Transceiver Interface |
Use Scenario: Shielding constant-current LED drivers in headlamp modules from alternator ripple and ignition noise. IC Role / Device Role / Timing Role: TVS connected across driver input terminals to clamp repetitive 100 V spikes induced by inductive ballast switching. Use Value: Withstands 200 W pulses at 10/1000 µs without degradation, maintaining luminous output stability over 15-year vehicle life. | Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TCAN1042) from ESD and coupled transients on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Unidirectional TVS on CAN_H line referenced to ground, suppressing common-mode surges while preserving signal edge integrity. Use Value: 103 V clamping prevents transceiver overvoltage lockup; SOD-123W footprint allows placement within 5 mm of connector for optimal high-frequency suppression. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same VWM (64 V), but SMA package (larger footprint, RθJA ≈ 140 °C/W), 400 W PPPM rating | Better surge margin but less suitable for space-constrained automotive PCBs | Prefer SMAJ64A only if board layout permits larger pad area and higher thermal mass is available |
| P6SMB64A | Same VWM and SOD-123W-compatible electrical specs, but not AEC-Q101 qualified; RθJA = 110 °C/W | Lacks automotive qualification; intended for industrial/commercial use only | Select P6SMB64A only for non-automotive designs where AEC-Q101 is not mandated |
Compared with SMAJ64A and P6SMB64A, the SMF64AH delivers automotive-grade reliability in the smallest qualified SOD-123W form factor, with superior thermal efficiency (RθJA = 100 °C/W) and guaranteed <1 µA leakage-making it optimal for compact, always-on vehicle electronics requiring long-term stability.
Availability
SMF64AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, LED lighting systems, and CAN FD communication nodes requiring stable component supply across extended production lifecycles.
Supply support for SMF64AH 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 production lines.
The SMF64AH belongs to TSC's SMF-AH series of automotive-qualified TVS diodes, engineered specifically for ISO 7637-2-compliant transient suppression in 12 V and 24 V vehicle electrical systems.
FAQ
What is the clamping voltage of the SMF64AH under standard test conditions?
The SMF64AH has a maximum clamping voltage (VC) of 103 V when subjected to a 10/1000 µs peak pulse current of 1.7 A. This value is measured per JEDEC standards and ensures predictable overvoltage limiting for downstream ICs. The clamping behavior is unidirectional and repeatable across its rated temperature range (−55 °C to +175 °C). Designers must verify layout parasitics do not elevate effective VC in high-di/dt applications.
Is the SMF64AH suitable for protecting CAN FD bus lines?
Yes, the SMF64AH is suitable for CAN FD interface protection when placed on the CAN_H line referenced to ground, provided the system operates below 64 V DC. Its low leakage (<1 µA) avoids signal distortion, and its 103 V clamping level protects transceivers from ESD and coupled transients. However, for bidirectional protection or common-mode surge suppression, a paired device or dedicated CAN TVS array may be required alongside the SMF64AH.
Does the SMF64AH meet AEC-Q101 requirements for automotive use?
Yes, the SMF64AH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2103). It has passed stress tests including high-temperature operating life, temperature cycling, humidity bias HAST, and mechanical shock-all required for automotive under-hood and cabin applications. Certification documentation is available upon request from Taiwan Semiconductor or authorized distributors.
What is the thermal resistance from junction to ambient for the SMF64AH?
The SMF64AH has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard 5 mm × 5 mm copper pad per JESD51-3. This value assumes FR-4 PCB with 1 oz copper and no additional thermal vias. For higher-power transient duty cycles, designers should consider adding thermal vias or increasing copper area to maintain TJ ≤ 175 °C under worst-case pulse repetition.
How does the SMF64AH compare to the SMF60AH in terms of voltage ratings?
The SMF64AH has a higher working stand-off voltage (VWM = 64 V) and breakdown range (71.1–78.6 V) than the SMF60AH (VWM = 60 V, VBR = 66.7–73.7 V), resulting in a higher clamping voltage (103 V vs. 96.8 V). This makes the SMF64AH better suited for 24 V nominal systems or applications with elevated baseline rail voltages, while retaining identical package, thermal specs, and AEC-Q101 qualification.
SMF64AH 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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
SMF64AH FAQ
1.How can I place an order for SMF64AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF64AH 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 SMF64AH reliable?
The price and inventory of SMF64AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF64AH is usually 5 days.
3.What payment methods are accepted for SMF64AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF64AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF64AH?
SMF64AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF64AH 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 SMF64AH?
For technical support, including SMF64AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF64AH requirements.
6.How does Aetrix verify that SMF64AH is sourced from the original manufacturer or authorized distributors?
All SMF64AH 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 SMF64AH meets industry standards.
7.What is the process for return or replacement of SMF64AH?
All SMF64AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF64AH, 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 SMF64AH part is unused and in its original packaging.
Return procedure for SMF64AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF64AH Tags
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