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Diodes Incorporated SMF4L9.0CAQ-7
- Part No.:
- SMF4L9.0CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L9.0CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,869
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Product details
Overview
SMF4L9.0CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for automotive-grade ESD and surge protection. It features 9.0V working peak reverse voltage (VRWM), 11.1V maximum breakdown voltage (VBR), 15.4V clamping voltage (VC) at 26A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and used in battery contact and power management circuits.
For engineers reviewing the SMF4L9.0CAQ-7 datasheet, SMF4L9.0CAQ-7 pinout, SMF4L9.0CAQ-7 application, or SMF4L9.0CAQ-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, IEC61000-4-2 ±30kV ESD capability, bi-directional symmetry for AC-coupled lines, and thermal resistance (RθJA = 96°C/W) under 1"×1" FR-4 layout constraints.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of differential or AC signal paths without polarity dependency. Its silicon avalanche structure delivers sub-5ns response time from 0V to VBR min, with clamping initiated before downstream IC damage thresholds are exceeded.
Designed for IATF 16949-certified production, it supports automotive power rail and interface line protection where bidirectional transients-such as load dump-induced reversals or coupled ESD events-require symmetrical clamping behavior and low leakage (<5μA at VRWM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0V - Maximum continuous reverse voltage before clamping begins; sets upper limit for safe operation on 9V nominal rails. |
| VBR (min/max) | 10.0V / 11.1V - Breakdown initiates within this range at 1mA test current; ensures predictable turn-on timing. |
| VC @ IPP | 15.4V @ 26A - Clamping voltage during 10/1000µs surge; defines worst-case overvoltage seen by protected circuitry. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; determines survivability against ISO 7637-2 Pulse 1/2/5a surges. |
| IR @ VRWM | 5μA - Reverse leakage at rated standoff voltage; low enough to avoid loading 9V battery monitoring circuits. |
| ESD Rating | ±30kV air / ±30kV contact (IEC61000-4-2) - Full-system ESD immunity without external shielding or filtering. |
| RθJA | 96°C/W - Junction-to-ambient thermal resistance on 1"×1" FR-4 board; informs derating above +25°C ambient. |
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 (Lead 1) | Transient current entry (negative polarity) | Connects to line being protected; forms one side of symmetrical avalanche path. |
| Cathode (Lead 2) | Transient current entry (positive polarity) | Connects to same line; completes bi-directional clamping path with Lead 1. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Identical VBR and VC characteristics for both polarities, enabling single-device protection of AC-coupled or floating interfaces. |
| AEC-Q101 qualification | Validated for automotive underhood and cabin environments including temperature cycling, humidity, and mechanical shock per stress test requirements. |
| Fast response time | <5.0ns from 0V to VBR min - limits voltage overshoot before clamping engages, critical for protecting high-speed CAN or LIN transceivers. |
| Halogen- and antimony-free "Green" construction | Meets <900ppm Br, <900ppm Cl, <1000ppm Sb - satisfies automotive OEM environmental compliance mandates (e.g., GMW3172, Ford WSS-M99P9999-A1). |
Applications
| Battery Management Systems | Automotive LIN Bus Interfaces |
|---|---|
Use Scenario: Protection of 12V battery monitor IC inputs against jump-start transients and load dump events. IC Role / Device Role / Timing Role: Bi-directional TVS placed between battery sense line and ground, clamping both positive and negative excursions. Use Value: Prevents latch-up or permanent damage to precision ADCs and voltage references operating near 9V nominal supply. | Use Scenario: ESD and surge suppression on LIN bus physical layer traces connecting body control modules and door modules. IC Role / Device Role / Timing Role: Line-side TVS connected between LIN signal and chassis ground, absorbing ±30kV contact ESD pulses. Use Value: Maintains LIN signal integrity below 20.5kbit/s while meeting ISO 16750-2 electrical load dump and ISO 10605 ESD immunity requirements. |
| Infotainment Power Rails | ADAS Camera Power Inputs |
Use Scenario: Input protection for DC-DC converters powering head unit processors and display drivers. IC Role / Device Role / Timing Role: TVS mounted at connector entry point on 9–16V input rail, shunting transients before regulator input capacitors. Use Value: Limits clamped voltage to 15.4V, ensuring input stage MOSFETs and controller ICs remain within absolute maximum ratings. | Use Scenario: Surge protection on 12V camera module power input exposed to engine bay EMI and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional TVS placed between camera power pin and ground, handling reverse-polarity connection errors and load dump. Use Value: Withstands 400W peak pulses without degradation, supporting ASIL-B functional safety requirements for vision system uptime. |
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 |
|---|---|---|---|
| SMAJ9.0A | DO-214AC package; higher RθJA (125°C/W); 10.0V VBR min; 15.4V VC @ 25.8A | Larger footprint; lower power density; less suitable for space-constrained automotive modules | Select when legacy PCB layout requires SMA package compatibility and thermal derating is acceptable. |
| TPSMD9.0 | DO-214AB package; 10.0V VBR min; 15.4V VC @ 26.0A; integrated thermal pad for RθJC = 10°C/W | Requires thermal via design; better for high-reliability underhood applications with sustained ambient >105°C | Prefer when junction temperature must stay below 150°C during repeated surge events in engine control units. |
Compared with SMAJ9.0A and TPSMD9.0, SMF4L9.0CAQ-7 offers superior power density (400W in DO-219AA vs. 400W in larger SMA/SMC), tighter VBR tolerance (10.0–11.1V vs. 10.0–12.2V), and AEC-Q101 certification out-of-box without additional qualification testing.
Availability
SMF4L9.0CAQ-7 is available at Aetrix Electronics and suitable for automotive battery management, LIN bus protection, and ADAS camera power input applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF4L9.0CAQ-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 North America.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive power line and data interface protection where compact size, high surge robustness, and zero-defect reliability are mandatory.
FAQ
What does the 'C' in SMF4L9.0CAQ-7 signify?
The 'C' denotes bi-directional configuration, confirmed by the absence of cathode band marking and identical electrical characteristics for both polarities in the datasheet's Electrical Characteristics table. This distinguishes it from uni-directional variants like SMF4L9.0AQ-7, which feature a cathode band and asymmetric forward/reverse behavior.
Is SMF4L9.0CAQ-7 suitable for protecting CAN FD interfaces?
Yes - its <5.0ns response time and 15.4V clamping voltage ensure fast suppression of ESD and fast-rising transients on CAN FD lines operating up to 5Mbit/s. However, capacitance is not specified in the datasheet, so designers must verify signal integrity impact via IBIS simulation or bench testing before deployment.
How does the DO-219AA package improve thermal performance over SMA (DO-214AC)?
DO-219AA provides lower thermal resistance: RθJA = 96°C/W versus SMA's typical 125°C/W due to optimized leadframe geometry and shorter thermal path. This allows higher sustained surge repetition rates in confined spaces, such as automotive junction boxes where airflow is limited and ambient temperatures exceed 85°C.
Does SMF4L9.0CAQ-7 require derating at elevated ambient temperatures?
Yes - Figure 1 in DS43393 shows linear derating of peak pulse power above +25°C: at +85°C, maximum PPK drops to ~280W. Designers must apply this derating when sizing for repetitive surges in under-hood applications, using the 10/1000µs waveform and verifying junction temperature remains below 175°C per absolute maximum ratings.
SMF4L9.0CAQ-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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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
SMF4L9.0CAQ-7 FAQ
1.How can I place an order for SMF4L9.0CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L9.0CAQ-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 SMF4L9.0CAQ-7 reliable?
The price and inventory of SMF4L9.0CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L9.0CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L9.0CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L9.0CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L9.0CAQ-7?
SMF4L9.0CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L9.0CAQ-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 SMF4L9.0CAQ-7?
For technical support, including SMF4L9.0CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L9.0CAQ-7 requirements.
6.How does Aetrix verify that SMF4L9.0CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L9.0CAQ-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 SMF4L9.0CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L9.0CAQ-7?
All SMF4L9.0CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L9.0CAQ-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 SMF4L9.0CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L9.0CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L9.0CAQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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