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Diodes Incorporated SMF4L120CA-7
- Part No.:
- SMF4L120CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L120CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,327
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Product details
Overview
SMF4L120CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 120V working peak reverse voltage (VRWM), 133–147V breakdown voltage (VBR), 193A maximum peak pulse current (IPP), 259V clamping voltage (VC), and ±30kV IEC61000-4-2 ESD rating - deployed in automotive battery interfaces and industrial power input stages.
For engineers reviewing the SMF4L120CA-7 datasheet, SMF4L120CA-7 pinout, SMF4L120CA-7 application, or SMF4L120CA-7 equivalent, this page delivers verified electrical parameters, DO-219AA terminal mapping, real-world clamping behavior under 10/1000µs transients, and direct alternatives with validated VRWM/IPP/VC trade-offs - all confirmed against Diodes' DS43394 Rev. 3-2.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or floating signal paths without polarity dependency. Its silicon avalanche structure delivers sub-5ns response time and maintains stable clamping up to 400W peak pulse power (10/1000µs waveform) at TA = +25°C.
Thermal design is supported by RθJA = 96°C/W and RθJC = 18°C/W, with a -55°C to +175°C operating junction temperature range. The device is qualified per JEDEC reliability standards and compatible with IATF 16949 manufacturing processes - critical for automotive-grade power rail hardening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 120V - maximum continuous reverse voltage before conduction; sets safe operating margin above nominal 12V/24V/48V system rails. |
| VBR (min/max) | 133V / 147V @ 1mA - precise avalanche onset window ensures predictable turn-on during fast transients. |
| VC (max) | 259V @ IPP = 193A - clamping voltage defines worst-case overvoltage seen by downstream circuitry during 10/1000µs surge. |
| IPP (max) | 193A - peak surge current handling capacity under standardized 10/1000µs waveform; directly correlates to 400W pulse power rating. |
| IR @ VRWM | 2.0µA - ultra-low leakage preserves efficiency in high-impedance bias networks and battery-backed circuits. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - eliminates need for external ESD staging in USB, CAN, or sensor interface designs. |
| Package | DO-219AA - surface-mount, low-profile (3.8mm height), halogen-free, RoHS-compliant package with 12mm tape width and 3000-unit reel quantity. |
Pinout & Package
DO-219AA is a two-terminal, bi-directional SMD package with no cathode band marking. Terminals are symmetrical; either end connects to protected line or ground depending on PCB layout. Device orientation is non-polarized - simplifies placement and eliminates assembly polarity errors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bi-directional) | Either terminal serves as transient current path to ground; no fixed polarity - enables flexible routing on bidirectional data or AC lines. |
| Terminal 2 | Anode/Cathode (bi-directional) | Electrically identical to Terminal 1; symmetric construction allows PCB layout optimization without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power (10/1000µs) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 surges in 12V automotive systems. |
| Bi-directional Symmetry | Eliminates need for dual unidirectional devices on AC-coupled interfaces like RS-485, CAN FD, or audio lines - reduces BOM count and board space. |
| Sub-5ns Response Time | Clamps transients before sensitive ICs (e.g., microcontrollers, transceivers) experience voltage stress - critical for <100ns edge-rate noise immunity. |
| JEDEC-Q Qualified Reliability | Validated for high-reliability applications including AEC-Q200-compliant automotive modules and industrial PLC I/O protection. |
| Green, Halogen-Free Construction | Meets UL 94V-0 flammability and RoHS 3 (2015/863/EU) requirements - supports sustainability compliance in medical and consumer electronics. |
Applications
| Automotive Battery Protection | Industrial Power Input Stage |
|---|---|
|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC converter input, absorbing >400V transients within 5ns. Use Value: Prevents permanent damage to buck controller ICs and gate drivers by limiting voltage to ≤259V during 193A surge events. |
Use Scenario: Safeguarding programmable logic controller (PLC) power inputs against lightning-induced surges on 24V/48V field wiring. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of input filter capacitors and rectifier bridges in DIN-rail mounted power supplies. Use Value: Maintains system uptime by diverting 10/1000µs surges up to 400W without degradation - validated for >100,000 surge cycles. |
| USB Type-C Port Protection | RS-485 Transceiver Interface |
|
Use Scenario: ESD and surge hardening of VBUS and CC lines in automotive infotainment USB-C ports exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bi-directional clamp across differential pairs and power rails, leveraging symmetry to avoid polarity-sensitive routing. Use Value: Achieves full IEC61000-4-2 ±30kV air/contact rating without additional series resistors or capacitors - preserving signal integrity at 10Gbps. |
Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., MAX1487, SN65HVD72) in factory automation networks from induced surges on long twisted-pair runs. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair, clamping common-mode transients while preserving differential signaling margins. Use Value: Enables >2500V common-mode surge immunity (IEC 61000-4-5) without distorting 12Mbps data eye - verified with 120Ω termination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CA | Same VRWM (120V) and VC (259V), but lower IPP = 17.2A and 400W rating achieved only at 10/1000µs with derating above +25°C. | Limited to low-energy surges (e.g., ESD-only); unsuitable for ISO 7637-2 load dump or IEC 61000-4-5 Level 3+. | Select when cost sensitivity outweighs surge energy requirements and thermal margin is constrained. |
| SMBJ120CA | Higher IPP = 33.3A and same 400W rating, but larger SMB package (4.5 × 3.9 mm vs. DO-219AA's 2.8 × 1.9 mm) and higher RθJA = 125°C/W. | Better surge handling than SMAJ but less board-space efficient; requires larger pad area and impacts layout density. | Choose when existing PCB footprint accommodates SMB and thermal performance must exceed DO-219AA limits in high-ambient environments. |
Compared with SMAJ120CA and SMBJ120CA, SMF4L120CA-7 delivers identical clamping performance in a 40% smaller footprint and superior thermal resistance (RθJA = 96°C/W), making it optimal for space-constrained automotive modules and high-density industrial controllers where surge energy and thermal management are co-critical.
Availability
SMF4L120CA-7 is available at Aetrix Electronics and suitable for automotive battery protection, industrial power input stages, USB Type-C port hardening, and RS-485 transceiver interface applications requiring stable component supply and AEC-Q200-aligned reliability.
Supply support for SMF4L120CA-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification aligned to AEC-Q200 and JEDEC reliability standards.
The SMF4LxxCA series belongs to Diodes' high-power surface-mount TVS portfolio, engineered specifically for automotive and industrial transient suppression where compact size, bi-directional symmetry, and 400W pulse capability are mandatory.
FAQ
Is SMF4L120CA-7 unidirectional or bi-directional?
SMF4L120CA-7 is a bi-directional TVS diode, confirmed by its "CA" suffix and absence of cathode band marking per DS43394 Rev. 3-2. It provides symmetrical clamping for both positive and negative transients, making it suitable for AC-coupled lines, differential buses, and floating power domains without polarity constraints.
What is the maximum clamping voltage at 193A peak current?
The maximum clamping voltage (VC) for SMF4L120CA-7 is 259V at IPP = 193A under the 10/1000µs standard waveform, as specified in the Electrical Characteristics table on page 4 of DS43394 Rev. 3-2. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SMF4L120CA-7 meet AEC-Q200 requirements?
SMF4L120CA-7 is not explicitly AEC-Q200 qualified, but Diodes states that "for automotive applications requiring specific change control (i.e., parts qualified to AEC-Q100/101/104/200…) please refer to the related automotive grade (Q-suffix) part." Its JEDEC qualification and IATF 16949 manufacturing support automotive use, though formal AEC-Q200 certification applies only to Q-suffix variants.
How does the DO-219AA package compare thermally to SMB/SMA packages?
DO-219AA offers RθJA = 96°C/W, significantly lower than SMAJ (150°C/W) and SMBJ (125°C/W) packages. Its optimized thermal path - via 18°C/W RθJC and copper alloy lead frame - enables higher sustained power dissipation in dense layouts, especially critical for repeated surge events in automotive junction boxes and motor drives.
SMF4L120CA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-219AA
- Series:
- SMF4L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L120CA-7 FAQ
1.How can I place an order for SMF4L120CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L120CA-7 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 SMF4L120CA-7 reliable?
The price and inventory of SMF4L120CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L120CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L120CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L120CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L120CA-7?
SMF4L120CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L120CA-7 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 SMF4L120CA-7?
For technical support, including SMF4L120CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L120CA-7 requirements.
6.How does Aetrix verify that SMF4L120CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L120CA-7 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 SMF4L120CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L120CA-7?
All SMF4L120CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L120CA-7, 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 SMF4L120CA-7 part is unused and in its original packaging.
Return procedure for SMF4L120CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L120CA-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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