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Diodes Incorporated SMF4L28CA-7
- Part No.:
- SMF4L28CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L28CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
SMF4L28CA-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 on signal/power lines. It features a 28V working peak reverse voltage (VRWM), 31.1–34.4V breakdown voltage (VBR), 45.4V maximum clamping voltage (VC) at 8.8A peak pulse current, and 400W peak pulse power rating per 10/1000µs waveform - deployed in automotive battery contacts and USB-C port protection.
For engineers reviewing the SMF4L28CA-7 datasheet, SMF4L28CA-7 pinout, SMF4L28CA-7 application, or SMF4L28CA-7 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, bi-directional symmetry for AC-coupled interfaces, IEC61000-4-2 ±30kV ESD robustness, and thermal derating above +25°C ambient.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with identical breakdown and clamping characteristics in forward and reverse directions. Its silicon avalanche structure enables sub-5ns response time and stable clamping under repetitive 10/1000µs transients up to 400W.
Designed for surface-mount placement on high-density PCBs, it uses a low-inductance DO-219AA leadless package with cathode-band-free marking to indicate bi-directionality. Thermal resistance junction-to-ambient is 96°C/W on standard FR-4 layout, supporting sustained operation within -55°C to +175°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line DC bias. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown occurs within this band at 1mA test current; defines turn-on threshold consistency. |
| VC @ IRSM | 45.4 V - Clamping voltage measured at 8.8A peak surge current; determines worst-case overvoltage seen by downstream ICs. |
| PPK | 400 W - Peak pulse power handling per 10/1000µs waveform; quantifies single-event surge energy absorption capability. |
| ESD Rating | ±30 kV (air/contact) per IEC61000-4-2 - Guarantees immunity to human-body-model electrostatic discharges without degradation. |
| IR @ VRWM | 0.5 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity in high-impedance paths. |
| TJ Range | -55°C to +175°C - Extended temperature capability supports under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-219AA - ultra-compact, leadless, surface-mount plastic package with matte tin-plated copper alloy terminals; moisture sensitivity level 1; UL 94V-0 rated molding compound; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional avalanche junction | No polarity marking; terminals are functionally identical - enables placement without orientation check on PCB. |
| Case / Body | Thermal path & mechanical anchor | Exposed metal frame provides low-thermal-resistance path to PCB copper; requires soldered pad for heat dissipation and mechanical reliability. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables protection against ISO 7637-2 Pulse 1/2a/3a surges and IEC 61000-4-5 combination wave events in automotive ECUs. |
| Bi-directional clamping symmetry | Eliminates need for polarity-aware layout; supports AC-coupled data lines (e.g., CAN FD, USB 2.0 differential pairs) without signal inversion risk. |
| ±30kV IEC61000-4-2 ESD robustness | Meets stringent system-level ESD immunity requirements for consumer and automotive infotainment ports without external shielding. |
| DO-219AA footprint (1.9 × 2.8 mm) | Reduces board area by >30% vs. SMA/SMB packages; compatible with fine-pitch automated placement and reflow profiles. |
| Halogen- and antimony-free "Green" construction | Complies with JEDEC J-STD-020 moisture sensitivity Level 1 and RoHS 3 (2015/863/EU) without performance trade-offs. |
Applications
| Automotive Battery Line Protection | USB-C Port ESD Clamp |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed modules (e.g., body control units) from load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device placed at connector entry point; absorbs multi-hundred-volt spikes within nanoseconds. Use Value: Limits voltage to ≤45.4V during 8.8A surge, preventing damage to 36V-rated power management ICs and microcontrollers. |
Use Scenario: Safeguarding USB-C receptacle pins (VBUS, CC, SBU) against hot-plug ESD and cable-induced surges. IC Role / Device Role / Timing Role: Bi-directional shunt clamp on each signal line; responds in <5ns to maintain signal integrity during ±30kV contact discharge. Use Value: Maintains <0.5µA leakage at 28V, avoiding false detection on CC logic while clamping VBUS to safe levels during fault conditions. |
| Industrial Sensor Interface Protection | RS-485 Transceiver Line Guard |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in factory automation systems exposed to motor switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector; suppresses fast-rising transients before reaching precision ADC front-end. Use Value: 0.5µA leakage preserves high-impedance sensor node accuracy; 45.4V clamping prevents saturation of rail-to-rail op-amps powered from ±15V supplies. |
Use Scenario: Securing RS-485 bus lines (A/B) in building automation networks subject to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Differential-mode TVS pair across A–B and common-mode clamp to ground; handles asymmetric surges without disrupting differential signaling. Use Value: Symmetrical 31.1–34.4V VBR ensures balanced clamping on both lines, preserving common-mode rejection ratio (CMRR) of transceivers during surge events. |
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 |
|---|---|---|---|
| SMAJ28CA-13-F | DO-214AC (SMA) package; 400W rating; higher VC = 48.4V at same IPP; 2.5× larger footprint. | Less suitable for space-constrained USB-C or miniaturized automotive sensors; better thermal mass for high-duty-cycle surges. | Select when board layout allows SMA size and higher clamping voltage is acceptable for protected IC VDD margin. |
| TPSMD28C | DO-214AB (SMC) package; 1500W rating; VC = 49.4V at 30.2A; higher leakage (1.0µA). | Targeted at heavy-duty industrial surge suppression (IEC 61000-4-5 Level 4); over-specified for portable electronics. | Choose only when system-level surge testing requires >1000W capability and PCB real estate permits larger SMC outline. |
Compared with SMAJ28CA-13-F and TPSMD28C, SMF4L28CA-7 delivers optimal balance of ultra-small DO-219AA size, tight 45.4V clamping, and full ±30kV ESD compliance - making it preferred for next-generation compact automotive and USB-C designs where board space and precise voltage limiting are critical.
Availability
SMF4L28CA-7 is available at Aetrix Electronics and suitable for automotive battery management, USB-C interface protection, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMF4L28CA-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 distribution operations across Asia, Europe, and North America.
The SMF4L series belongs to Diodes' high-reliability transient suppression portfolio, engineered specifically for AEC-Q200-compliant automotive subsystems and industrial equipment demanding robust ESD/surge immunity in miniature surface-mount formats.
FAQ
What is the polarity configuration of SMF4L28CA-7?
SMF4L28CA-7 is a bi-directional TVS diode with symmetrical avalanche characteristics in both forward and reverse directions. It has no cathode band marking - terminals are interchangeable, enabling orientation-agnostic PCB placement and simplifying assembly for differential or AC-coupled signal lines.
Does SMF4L28CA-7 meet AEC-Q200 requirements?
SMF4L28CA-7 itself is not AEC-Q200 qualified; however, Diodes offers automotive-grade variants with Q-suffix (e.g., SMF4L28CAQ-7) that are fully qualified to AEC-Q200 Rev H, manufactured in IATF 16949-certified facilities, and PPAP-capable. Standard SMF4L28CA-7 is intended for commercial/industrial use.
How does the DO-219AA package affect thermal performance?
The DO-219AA package achieves a junction-to-ambient thermal resistance (RθJA) of 96°C/W on standard 1"×1" FR-4 with 2 oz. copper. Its low-profile, leadless construction minimizes parasitic inductance but requires adequate PCB copper area under the body for effective heat spreading - unlike leaded packages, it relies entirely on solder joint and pad conduction.
Can SMF4L28CA-7 be used in place of a unidirectional TVS like SMF4L28A-7?
No - SMF4L28CA-7 is bi-directional and lacks polarity; substituting it for unidirectional SMF4L28A-7 on DC-biased lines (e.g., 5V power rail) risks forward conduction and short-circuit behavior. Use only where symmetrical clamping is required, such as AC signals, differential buses, or dual-supply interfaces.
SMF4L28CA-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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
SMF4L28CA-7 FAQ
1.How can I place an order for SMF4L28CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L28CA-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 SMF4L28CA-7 reliable?
The price and inventory of SMF4L28CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L28CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L28CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L28CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L28CA-7?
SMF4L28CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L28CA-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 SMF4L28CA-7?
For technical support, including SMF4L28CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L28CA-7 requirements.
6.How does Aetrix verify that SMF4L28CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L28CA-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 SMF4L28CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L28CA-7?
All SMF4L28CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L28CA-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 SMF4L28CA-7 part is unused and in its original packaging.
Return procedure for SMF4L28CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L28CA-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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