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Diodes Incorporated SMF4L14CAQ-7
- Part No.:
- SMF4L14CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L14CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,200
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Product details
Overview
SMF4L14CAQ-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 on signal/power lines. It features 14 V working peak reverse voltage (VRWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power (10/1000 µs). It is used in battery contact protection and CAN/LIN bus interfaces requiring AEC-Q101 qualification.
For engineers reviewing the SMF4L14CAQ-7 datasheet, SMF4L14CAQ-7 pinout, SMF4L14CAQ-7 application, or SMF4L14CAQ-7 equivalent, this page delivers verified electrical parameters, AEC-Q101-compliant automotive use context, DO-219AA terminal mapping, and direct alternatives with clamping voltage and leakage differences critical for low-power sensor interface design.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection against ±30 kV IEC61000-4-2 ESD events without polarity-sensitive layout constraints. Its sub-5 ns response time ensures clamping activation before downstream IC damage thresholds are exceeded in fast-rising transients.
The device uses planar junction silicon construction with low-junction-capacitance design (<50 pF at 1 MHz), minimizing signal distortion on high-speed lines like LIN or low-voltage sensor buses. Thermal resistance (RθJA = 96 °C/W) and 1.0 W steady-state dissipation support operation in compact automotive PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 15.6 V / 17.2 V - Breakdown initiates within this range at 1 mA test current; defines onset of clamping behavior. |
| VC @ IPP | 23.2 V @ 17.2 A - Clamped voltage during 10/1000 µs surge; determines maximum stress seen by downstream ICs. |
| IPP (max) | 17.2 A - Peak surge current the device safely handles per standard waveform; defines protection level against ISO 7637-2 pulses. |
| IR @ VRWM | 0.5 µA - Reverse leakage at rated standoff voltage; enables ultra-low quiescent current in always-on battery circuits. |
| PPK | 400 W - Peak pulse power rating (10/1000 µs); confirms capability to absorb automotive load-dump surges up to specified energy. |
| ESD Rating | ±30 kV air / ±30 kV contact (IEC61000-4-2) - Validates immunity to human-body-model and system-level ESD events in vehicle assembly and service environments. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat-lead, bi-directional TVS in green molded plastic (UL 94V-0), 0.016 g weight, moisture sensitivity level 1. Cathode band omitted to indicate bi-directional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry under negative transient | One end of symmetrical junction; connects to protected line without polarity constraint. |
| Cathode | Current entry under positive transient | Other end of symmetrical junction; completes bi-directional clamping path with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications including temperature cycling, humidity, and mechanical shock per JESD47. |
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating lines (e.g., LIN bus, sensor differential pairs) without external polarity routing. |
| Low IR (0.5 µA) | Minimizes standby current drain in always-connected battery systems (e.g., telematics, keyless entry modules). |
| Fast response (<5 ns) | Activates before 10 ns rise-time transients (e.g., ISO 10605 ESD) reach vulnerable CMOS inputs, preventing latch-up or gate oxide rupture. |
| Green, RoHS-compliant | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global automotive environmental mandates. |
Applications
| Automotive LIN Bus Protection | Battery Contact ESD Guard |
|---|---|
|
Use Scenario: LIN transceiver interface exposed to harness-level ESD and switching noise in body control modules. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between LIN pin and ground, limiting transients to ≤23.2 V during ±30 kV contact discharge. Use Value: Prevents LIN PHY damage while maintaining <50 pF capacitance to avoid signal edge degradation at 19.2 kbps baud rate. |
Use Scenario: Direct connection point between vehicle battery and electronic control unit, subject to hot-plug and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, absorbing 400 W pulses to protect DC-DC converters and microcontrollers. Use Value: Enables compliance with ISO 7637-2 Pulse 1 (−150 V, 2 Ω source) and Pulse 2a (−100 V) without derating or parallel devices. |
| Infotainment USB Port Surge Suppression | Occupant Detection Sensor Interface |
|
Use Scenario: USB 2.0 data lines (D+/D−) in center console, exposed to user-hand ESD and cable-induced transients. IC Role / Device Role / Timing Role: Dual-channel bi-directional TVS (one per line) referenced to common ground, clamping differential and common-mode surges. Use Value: Maintains signal integrity with <50 pF junction capacitance per line, avoiding USB 2.0 eye diagram closure at 480 Mbps. |
Use Scenario: Analog output from capacitive occupant detection sensor (e.g., seat belt pretensioner trigger) connected to ADC input. IC Role / Device Role / Timing Role: Low-leakage (0.5 µA) TVS on sensor analog line, protecting precision amplifier inputs from ESD without offset drift. Use Value: Ensures <1 µV input-referred offset error contribution from leakage, preserving 12-bit ADC accuracy in safety-critical sensing. |
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 |
|---|---|---|---|
| SMAJ14CA | DO-214AC package; higher RθJA (125 °C/W); VC = 23.2 V same, but IPP = 17.2 A identical; VRWM = 14 V same. | Larger footprint (4.5 × 2.7 mm vs. 2.0 × 1.9 mm) limits use in space-constrained modules like door ECUs. | Select when legacy DO-214AC footprint compatibility is required; avoid if board area or thermal performance is constrained. |
| TPSMD14C | DO-214AB package; lower VC = 21.2 V at 17.2 A; VRWM = 14 V same; IR = 1 µA (2× higher leakage). | Better clamping margin for 3.3 V logic rails but higher leakage may affect ultra-low-power wake-on-event sensors. | Prefer for 3.3 V MCU I/O protection where tighter clamping is prioritized over nanoampere standby current. |
Compared with SMAJ14CA and TPSMD14C, SMF4L14CAQ-7 offers superior board-area efficiency (DO-219AA), lowest thermal resistance among 14 V bi-directional TVS options, and the lowest leakage-making it optimal for space- and power-sensitive automotive modules requiring AEC-Q101 validation.
Availability
SMF4L14CAQ-7 is available at Aetrix Electronics and suitable for automotive LIN bus protection, battery contact ESD guard, and occupant detection sensor interface requiring stable component supply across multi-year production cycles.
Supply support for SMF4L14CAQ-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 power-line and signal-line transient suppression with emphasis on small-footprint packaging, low leakage, and high ESD robustness.
FAQ
What is the polarity configuration of SMF4L14CAQ-7?
SMF4L14CAQ-7 is a bi-directional TVS diode, confirmed by absence of cathode band marking and its dual-quadrant clamping behavior. It protects against both positive and negative transients on the same line without requiring orientation-specific placement on PCB.
Does SMF4L14CAQ-7 meet automotive qualification standards?
Yes-SMF4L14CAQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. Its qualification covers temperature cycling, mechanical shock, humidity, and ESD testing per automotive reliability requirements.
How does the DO-219AA package impact thermal performance?
The DO-219AA package provides RθJA = 96 °C/W (vs. 125 °C/W for DO-214AC), enabling higher sustained power handling in dense automotive PCBs. Its low profile (0.6 mm typical height) also supports automated optical inspection and reduces mechanical stress under thermal cycling.
Can SMF4L14CAQ-7 replace uni-directional TVS diodes in existing designs?
No-it is not a drop-in replacement for uni-directional TVS diodes due to symmetrical IV characteristics and lack of cathode marking. Replacing a uni-directional part requires verifying that both polarities of the protected line require clamping and that no DC bias conflicts exist.
SMF4L14CAQ-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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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
SMF4L14CAQ-7 FAQ
1.How can I place an order for SMF4L14CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L14CAQ-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 SMF4L14CAQ-7 reliable?
The price and inventory of SMF4L14CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L14CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L14CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L14CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L14CAQ-7?
SMF4L14CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L14CAQ-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 SMF4L14CAQ-7?
For technical support, including SMF4L14CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L14CAQ-7 requirements.
6.How does Aetrix verify that SMF4L14CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L14CAQ-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 SMF4L14CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L14CAQ-7?
All SMF4L14CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L14CAQ-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 SMF4L14CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L14CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L14CAQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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