My Inquiry
My Account
Taiwan Semiconductor Corporation SMF64A
- Part No.:
- SMF64A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF64A.pdf
- Description:
- TVS DIODE 64VWM 103VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF64A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 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 commonly deployed in automotive body electronics, industrial sensor interfaces, and USB port protection circuits.
For engineers reviewing the SMF64A datasheet, SMF64A pinout, SMF64A application, or SMF64A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1 µA @ 64 V), SOD-123W package compatibility with automated assembly, and thermal robustness up to TJ = 175 °C.
Technical Context
The SMF64A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its SOD-123W package provides optimized thermal path via copper pad mounting (RθJA = 100 °C/W, RθJL = 33 °C/W).
It meets ISO 7637-2 immunity requirements for automotive electronics, delivering consistent clamping response across –55 °C to +175 °C junction temperature range. The device sustains 200 W peak pulse power only when waveform conforms strictly to 10/1000 µs definition per REA standards, with derating applied above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 71.1 V / 78.6 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on timing. |
| VC @ IPPM | 103 V - Clamped voltage at 1.7 A peak pulse current (10/1000 µs); determines protected circuit's maximum overvoltage stress. |
| PPPM | 200 W - Peak pulse power handling capability; validates suitability for ISO 7637-2 Pulse 1/2a/2b/3a/3b transients. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss in battery-powered systems. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in under-hood automotive or high-ambient industrial environments. |
Pinout & Package
Package: SOD-123W - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, cathode indicated by band, weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or data line); conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Clamping voltage ≤103 V @ 1.7 A | Provides defined overvoltage ceiling for downstream ICs rated to 100 V absolute maximum. |
| Moisture sensitivity level 1 (J-STD-020) | Enables standard SMT reflow without baking; compatible with high-volume automated assembly. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates robustness against real-world automotive load-dump and inductive-switching transients. |
Applications
| Automotive Body Control Module (BCM) | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protects microcontroller I/O and power supply inputs from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 12 V rail and ground. Use Value: Limits rail voltage to ≤103 V during 200 W pulses, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. |
Use Scenario: Shields RS-485 transceiver pins from EFT bursts and cable-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Line-side transient suppressor on differential bus lines (A/B) referenced to local ground. Use Value: Maintains signal integrity by clamping transients before they exceed transceiver's ±15 V common-mode range. |
| USB 2.0 Host Port Protection | Smart Lighting LED Driver Input Stage |
Use Scenario: Guards USB VBUS and D+/D− lines against ESD events per IEC 61000-4-2 (±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on VBUS; bidirectional variants used on data lines. Use Value: Sub-1 µA leakage preserves VBUS quiescent current budget; fast response prevents ESD-induced PHY reset. |
Use Scenario: Absorbs inductive kickback from MOSFET switching in constant-current LED drivers. IC Role / Device Role / Timing Role: Freewheeling clamp across input bulk capacitor or switching node. Use Value: Dissipates 200 W surge energy without degradation, enabling compact driver design without snubber resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A (onsemi) | Same VWM (64 V), but higher VC = 107 V @ 1.7 A; SOD-123 package (slightly smaller footprint than SOD-123W). | Marginally higher clamping voltage reduces protection margin for 100 V-rated ICs; identical ISO 7637-2 coverage. | Select SMAJ64A only if board space constraints favor SOD-123 and 4 V higher VC is acceptable. |
| P6SMB64A (Littelfuse) | Same VWM/VBR/VC specs; SMC (DO-214AB) package - larger footprint, higher thermal mass (RθJA = 50 °C/W). | Better steady-state power handling (1.5 W vs. 1 W), but incompatible with SOD-123W land pattern; requires PCB redesign. | Choose P6SMB64A for high-temperature ambient designs where thermal dissipation outweighs layout flexibility. |
Compared with SMAJ64A and P6SMB64A, the SMF64A offers optimal balance of low-profile SOD-123W packaging, tight clamping (103 V), and J-STD-020 Level 1 moisture resistance - making it preferred for space-constrained, high-reliability automotive and industrial PCBs.
Availability
SMF64A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial RS-485 nodes, and smart lighting driver inputs requiring stable component supply and full traceability.
Supply support for SMF64A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for industrial and automotive markets.
The SMF64A belongs to TSC's SMF-series unidirectional TVS family, engineered specifically to meet stringent ISO 7637-2 immunity requirements while supporting high-volume SMT manufacturing with J-STD-020 Level 1 reliability.
FAQ
What is the maximum clamping voltage of the SMF64A under standard test conditions?
The SMF64A exhibits 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 defines the upper voltage limit imposed on protected circuitry during transient events. The SMF64A maintains this clamping performance across its specified operating temperature range and is validated for ISO 7637-2 compliance. Designers must ensure downstream components tolerate this 103 V ceiling during surge conditions.
Does the SMF64A meet automotive transient immunity standards?
Yes, the SMF64A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms - critical for automotive electronic control units. Its 200 W peak pulse power rating, low leakage (<1 µA @ 64 V), and stable clamping behavior across –55 °C to +175 °C junction temperature make it suitable for body electronics, infotainment, and sensor modules. The SMF64A is not rated for safety-critical systems like airbag controllers or brake ECUs.
What is the package type and mounting compatibility of the SMF64A?
The SMF64A uses the SOD-123W surface-mount package - a reinforced variant of SOD-123 with enhanced thermal pad area and leadframe design. It features matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. The SMF64A is compatible with standard reflow profiles and requires a 5 mm × 5 mm copper pad for optimal thermal performance per datasheet recommendations.
How does the SMF64A compare to bidirectional TVS diodes in ESD protection?
The SMF64A is unidirectional and optimized for DC rail protection where polarity is fixed - such as 12 V or 24 V power lines. Unlike bidirectional TVS diodes, it does not conduct during normal positive signal swings, minimizing capacitance and leakage. For data lines like USB or CAN, bidirectional variants (e.g., SMBJ6.0CA) are preferred. The SMF64A's unidirectional architecture delivers tighter clamping and lower IR, making it superior for power-supply-side transient suppression.
Is the SMF64A RoHS and halogen-free compliant?
Yes, the SMF64A is fully RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and all materials comply with EU Directive 2011/65/EU and subsequent amendments. Taiwan Semiconductor certifies that no brominated flame retardants (BFRs), antimony trioxide, or phosphorus-based flame retardants exceeding threshold limits are used in the SMF64A's construction.
SMF64A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF64A FAQ
1.How can I place an order for SMF64A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF64A 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 SMF64A reliable?
The price and inventory of SMF64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF64A is usually 5 days.
3.What payment methods are accepted for SMF64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF64A?
SMF64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF64A 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 SMF64A?
For technical support, including SMF64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF64A requirements.
6.How does Aetrix verify that SMF64A is sourced from the original manufacturer or authorized distributors?
All SMF64A 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 SMF64A meets industry standards.
7.What is the process for return or replacement of SMF64A?
All SMF64A units undergo pre-shipment inspection (PSI). If there is an issue with SMF64A, 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 SMF64A part is unused and in its original packaging.
Return procedure for SMF64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF64A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
