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Diodes Incorporated SMF4L120CAQ-7
- Part No.:
- SMF4L120CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L120CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,841
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Product details
Overview
SMF4L120CAQ-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 automotive power rails and battery interfaces. It features a 120V working peak reverse voltage (VRWM), 133V minimum breakdown voltage (VBR), 193V maximum clamping voltage (VC) at 2A, 400W peak pulse power (10/1000µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMF4L120CAQ-7 datasheet, SMF4L120CAQ-7 pinout, SMF4L120CAQ-7 application, or SMF4L120CAQ-7 equivalent, this device is selected for robust overvoltage protection where fast response (<5ns), low leakage (<2.0µA at VRWM), and IATF 16949-manufactured reliability are required in 12V/24V automotive systems, battery management modules, and industrial DC power inputs.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal/power lines without polarity dependency. Its silicon avalanche structure delivers sub-5ns response from 0V to VBR, with clamping performance validated at IRSM = 2A per the 10/1000µs waveform.
The device sustains 400W peak pulse power under standardized surge conditions while maintaining thermal stability via low RθJA (96°C/W) on FR-4 PCBs and junction temperature range from –55°C to +175°C - critical for engine control unit (ECU) and ADAS power supply designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 120V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin above 24V automotive nominal rail. |
| VBR (min) | 133V @ 1mA - Confirmed avalanche onset threshold; ensures reliable triggering above system transients but below component breakdown limits. |
| VC (max) | 193V @ 2A - Clamped voltage during 10/1000µs surge; defines worst-case stress imposed on downstream ICs during ISO 7637-2 Pulse 1/2a events. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; supports EN 61000-4-5 Level 4 (4kV) surge immunity in compact footprint. |
| IR @ VRWM | 2.0µA - Reverse leakage at rated standoff voltage; minimizes quiescent power loss in always-on battery-connected circuits. |
| Response Time | <5.0ns - Time from 0V to VBR under bi-directional surge; enables protection of fast-edge microcontroller I/O and CAN transceivers. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TCT, and ESD testing; supports PPAP documentation for Tier 1 suppliers. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat lead, green molding compound (UL 94V-0), 0.016g weight, moisture sensitivity level 1. Cathode band omitted to indicate bi-directional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional avalanche terminals | No polarity dependence; either terminal serves as current entry point during positive or negative transients - simplifies PCB layout in differential or floating nodes. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD rating | Air ±30kV / Contact ±30kV - Enables single-device compliance with automotive infotainment and body control module ESD test plans. |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); Br+Cl <1500ppm, Sb <1000ppm - Meets EU ELV and OEM sustainability requirements for vehicle end-of-life processing. |
| Thermal resistance (Junction-to-Ambient) | 96°C/W on 1"×1" FR-4, 2oz Cu - Supports sustained operation at TA ≤125°C in engine bay environments without forced cooling. |
| Steady-state power dissipation | 1.0W - Allows continuous biasing in low-leakage monitoring circuits without thermal runaway risk. |
Applications
| Automotive Power Rail Protection | Battery Management System (BMS) Input |
|---|---|
|
Use Scenario: 12V/24V main power distribution network in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤193V during 100A/100ms load dump events, preventing latch-up or gate oxide damage in downstream PMICs. |
Use Scenario: High-side input protection for lithium-ion battery pack monitors subjected to hot-plug and cell reversal transients. IC Role / Device Role: First-line transient suppressor between connector and analog front-end (AFE) IC. Use Value: Absorbs 400W surges while maintaining <2µA leakage, preserving battery standby life and enabling accurate voltage sensing. |
| Industrial DC Power Input | ADAS Camera Module Interface |
|
Use Scenario: 24V auxiliary power input in factory automation controllers subject to inductive switching noise and lightning-induced surges. IC Role / Device Role: Standoff-rated protector co-located with fuse and common-mode choke. Use Value: Provides 120V VRWM margin above nominal rail and clamps to 193V within 5ns, protecting isolated RS-485 transceivers and MCU reset circuitry. |
Use Scenario: Bi-directional protection of FAKRA or HSD camera links carrying both power and high-speed video signals. IC Role / Device Role: Symmetric TVS across power and shield lines to suppress common-mode ESD bursts. Use Value: Eliminates need for separate uni-directional devices per line; maintains signal integrity with <1pF junction capacitance (typ.) at 0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CA | DO-214AC package; 193V VC @ 2A; same VRWM/VBR but higher RθJA (125°C/W) | Larger footprint; less suitable for dense automotive PCBs with tight thermal constraints | Prefer SMF4L120CAQ-7 when board space or thermal performance is critical. |
| TPSMD120C | DO-214AB package; 193V VC @ 2A; 500W PPK but non-AEC-Q101 qualified | Higher surge rating but lacks automotive qualification and PPAP support | Choose SMF4L120CAQ-7 for production automotive programs requiring AEC-Q101 traceability. |
Compared with SMAJ120CA and TPSMD120C, SMF4L120CAQ-7 delivers identical clamping performance in a smaller DO-219AA package with superior thermal resistance and full AEC-Q101 certification - making it the preferred choice for space-constrained, thermally demanding, and safety-critical automotive deployments.
Availability
SMF4L120CAQ-7 is available at Aetrix Electronics and suitable for automotive power rail protection, battery management system inputs, and industrial DC power interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMF4L120CAQ-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive-grade transient suppression in power management, battery interface, and sensor signal conditioning applications.
FAQ
What is the maximum clamping voltage of SMF4L120CAQ-7 at 2A?
The maximum clamping voltage (VC) is 193V at 2A peak pulse current under the 10/1000µs waveform. This value is measured per JEDEC standards and guarantees that downstream components experience no more than 193V during specified surge events, ensuring compatibility with 200V-rated MOSFETs and automotive-grade regulators.
Is SMF4L120CAQ-7 suitable for bidirectional data line protection?
No - SMF4L120CAQ-7 is optimized for power rail and battery interface protection, not high-speed data lines. Its junction capacitance is unspecified in the datasheet for signal integrity use cases, and its 193V clamping voltage exceeds typical data line voltage rails. For CAN, LIN, or USB, lower-voltage bi-directional TVS devices such as D3V3F4U60DP-7 are recommended.
Does SMF4L120CAQ-7 require derating at elevated ambient temperatures?
Yes - peak pulse power must be derated linearly above +25°C ambient, per Figure 1 in DS43393. At +125°C, only ~55% of 400W (≈220W) is sustainable. Designers must apply this derating when placing the device near heat sources like power inductors or processors in engine compartment modules.
How is polarity identified on the SMF4L120CAQ-7 package?
SMF4L120CAQ-7 is bi-directional and has no cathode band marking. The DO-219AA top view shows symmetrical terminals with no polarity indicator - confirming its bidirectional functionality. This eliminates orientation errors during automated placement and simplifies layout for floating or AC-coupled protection points.
SMF4L120CAQ-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L120CAQ-7 FAQ
1.How can I place an order for SMF4L120CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L120CAQ-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 SMF4L120CAQ-7 reliable?
The price and inventory of SMF4L120CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L120CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L120CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L120CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L120CAQ-7?
SMF4L120CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L120CAQ-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 SMF4L120CAQ-7?
For technical support, including SMF4L120CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L120CAQ-7 requirements.
6.How does Aetrix verify that SMF4L120CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L120CAQ-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 SMF4L120CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L120CAQ-7?
All SMF4L120CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L120CAQ-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 SMF4L120CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L120CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L120CAQ-7 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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