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Diodes Incorporated SMF4L18CA-7
- Part No.:
- SMF4L18CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L18CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:5,720
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Product details
Overview
SMF4L18CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 400W peak pulse power (10/1000µs), 18V working peak reverse voltage (VRWM), 29.2V maximum clamping voltage (VC) at 13.7A surge current, and ±30kV IEC61000-4-2 ESD protection. It protects battery contacts and automotive power rails against fast transients.
For engineers reviewing the SMF4L18CA-7 datasheet, SMF4L18CA-7 pinout, SMF4L18CA-7 application, or SMF4L18CA-7 equivalent, this device serves as a compact, high-surge-capability TVS for space-constrained DC power line protection where low clamping voltage and sub-5ns response are critical.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage VBR between 20.0V and 22.1V at 1mA test current. Its clamping behavior is defined by VC ≤ 29.2V at IRSM = 13.7A under 10/1000µs waveform, ensuring predictable overvoltage limiting during ESD or load-dump events.
Thermal design is supported by RθJA = 96°C/W (on 1"×1" FR-4, 2 oz Cu), RθJC = 18°C/W, and operating junction temperature range of –55°C to +175°C - enabling use in under-hood automotive environments and industrial power modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); sustains high-energy surges without failure in automotive load-dump scenarios |
| Working Peak Reverse Voltage | 18V; blocks normal system voltage while remaining inactive until transient exceeds threshold |
| Max Clamping Voltage | 29.2V at 13.7A; limits downstream IC voltage stress to safe levels during 10/1000µs transients |
| ESD Rating | ±30kV contact & air per IEC61000-4-2; eliminates need for additional ESD stages on exposed ports |
| Response Time | <5.0ns (bi-directional); activates before sensitive circuitry sustains damage from fast-rising transients |
| Junction Temp Range | –55°C to +175°C; qualified for under-hood automotive and industrial ambient conditions |
| Package | DO-219AA; surface-mount, 2.8mm × 1.9mm footprint with low thermal resistance (RθJC = 18°C/W) |
Pinout & Package
DO-219AA package: bi-directional device with no cathode band; symmetrical two-terminal construction. Terminals are matte tin-finished copper alloy leads, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Bi-directional conduction allows clamping of positive and negative polarity transients without polarity orientation constraints |
| Case / Body | Thermal interface | Molded plastic body with UL 94V-0 rating; transfers heat to PCB via soldered terminals (RθJS = 70°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) up to 12V systems without derating |
| Low clamping ratio (VC/VRWM = 1.62) | Minimizes overvoltage margin required for protected ICs, supporting tighter system voltage tolerances |
| Bi-directional architecture | Eliminates polarity-checking during placement; simplifies layout and reduces BOM count in dual-rail or AC-coupled lines |
| Halogen- and antimony-free "Green" construction | Meets automotive and industrial RoHS 3 (2015/863/EU) and JIG-STD-020 Level 1 moisture sensitivity requirements |
| Fast response & low capacitance | Sub-5ns turn-on with typical junction capacitance <100pF supports high-speed data line co-location without signal integrity impact |
Applications
| Automotive Infotainment Power Input | USB-C Port ESD Protection |
|---|---|
Use Scenario: Protects 12V input rail of head unit power management ICs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional TVS clamps both positive and negative excursions on unregulated battery feed. Use Value: Withstands 400W pulses and maintains clamping below 29.2V, preventing PMIC latch-up or LDO overvoltage failure. |
Use Scenario: Shields USB-C CC and VBUS pins from ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Fast-acting bi-directional clamp absorbs ±30kV contact discharge before transceiver ICs experience latch-up. Use Value: Sub-5ns response ensures clamping initiates prior to USB-C PHY's 10ns immunity window expiration. |
| Industrial Battery Management System | Smart Meter DC Power Interface |
Use Scenario: Guards BMS MCU supply rail against battery terminal reversal and ESD during field servicing. IC Role / Device Role / Timing Role: Standoff voltage (18V) matches nominal LiFePO₄ stack voltage; clamps reversals above ±29.2V. Use Value: Bi-directional symmetry enables single-component protection for both forward and reverse polarity faults. |
Use Scenario: Secures 24V DC input of smart meter against lightning-induced surges on utility-side wiring. IC Role / Device Role / Timing Role: TVS placed upstream of DC-DC converter; clamps induced transients before they reach isolation barrier. Use Value: 400W rating handles 10/1000µs surges per IEC 61000-4-5 Level 3 (2kV), reducing need for multi-stage protection. |
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 |
|---|---|---|---|
| SMAJ18CA-13-F | Same VRWM (18V), but lower PPK = 400W (same), higher VC = 29.7V, DO-214AC package (larger, RθJA = 100°C/W) | Less suitable for ultra-compact layouts; higher thermal resistance limits sustained surge duty cycle | Prefer SMF4L18CA-7 when board space or thermal performance is constrained |
| 1.5SMC18CA | Higher PPK = 1500W, same VRWM, larger DO-214AB package (7.1mm × 6.2mm), RθJA = 15°C/W | Over-specified for most 12–24V applications; excessive size and cost for ESD + moderate surge needs | Choose only if legacy design requires through-hole or >1kW surge handling |
Compared with SMAJ18CA-13-F and 1.5SMC18CA, SMF4L18CA-7 delivers identical 18V standoff and 400W surge capability in a 40% smaller footprint and 30% lower thermal resistance - optimizing space, weight, and thermal margin in modern automotive and portable electronics.
Availability
SMF4L18CA-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-C peripheral protection, and industrial battery management requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMF4L18CA-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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and consumer markets.
This part belongs to the SMF4L(C)A series of ultra-compact 400W TVS diodes designed specifically for space-constrained, high-surge automotive and industrial power-line protection where DO-219AA's thermal and footprint advantages are critical.
FAQ
Is SMF4L18CA-7 unidirectional or bidirectional?
SMF4L18CA-7 is a bi-directional TVS diode, indicated by the "C" suffix and absence of cathode band marking. It clamps transients of either polarity symmetrically, making it ideal for AC-coupled lines or battery inputs where reverse connection risk exists.
What is the maximum operating temperature for SMF4L18CA-7?
The SMF4L18CA-7 has a specified operating junction temperature range of –55°C to +175°C. This rating is validated per JEDEC standards and supports deployment in under-hood automotive environments and industrial enclosures without derating up to +125°C ambient (with appropriate PCB thermal design).
Does SMF4L18CA-7 meet AEC-Q200 qualification?
No - SMF4L18CA-7 is not AEC-Q200 qualified. For automotive-grade applications requiring AEC-Q200 compliance, Diodes offers the Q-suffix variants (e.g., SMF4L18CAQ-7), which undergo additional stress testing and are manufactured in IATF 16949-certified facilities.
Can SMF4L18CA-7 be used in place of SMAJ18CA?
Yes, functionally - both are 18V bi-directional 400W TVS diodes - but SMF4L18CA-7 uses DO-219AA (2.8mm × 1.9mm), while SMAJ18CA uses DO-214AC (4.5mm × 3.9mm). Layout redesign is required due to footprint and thermal pad differences; electrical performance is comparable but clamping voltage differs slightly (29.2V vs. 29.7V).
SMF4L18CA-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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 13.7A
- 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
SMF4L18CA-7 FAQ
1.How can I place an order for SMF4L18CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L18CA-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 SMF4L18CA-7 reliable?
The price and inventory of SMF4L18CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L18CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L18CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L18CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L18CA-7?
SMF4L18CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L18CA-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 SMF4L18CA-7?
For technical support, including SMF4L18CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L18CA-7 requirements.
6.How does Aetrix verify that SMF4L18CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L18CA-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 SMF4L18CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L18CA-7?
All SMF4L18CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L18CA-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 SMF4L18CA-7 part is unused and in its original packaging.
Return procedure for SMF4L18CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L18CA-7 Tags
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ESD9B5.0ST5G
onsemi
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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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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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