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Diodes Incorporated SMF4L22CA-7
- Part No.:
- SMF4L22CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L22CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,341
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Product details
Overview
SMF4L22CA-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 22V working peak reverse voltage (VRWM), 24.4V minimum breakdown voltage (VBR), 35.5V maximum clamping voltage (VC) at 11.2A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive battery contacts and industrial power management interfaces.
For engineers reviewing the SMF4L22CA-7 datasheet, SMF4L22CA-7 pinout, SMF4L22CA-7 application, or SMF4L22CA-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, IEC61000-4-2 ±30kV air/contact ESD capability, bi-directional symmetry for AC-coupled lines, and DO-219AA thermal performance under sustained surge stress.
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 delivers sub-5ns response time and maintains stable clamping up to 43.8A peak surge current (for lower-voltage variants); at 22V rating, it sustains 11.2A IPP while limiting VC to ≤35.5V.
The device leverages low-junction-to-case thermal resistance (RθJC = 18°C/W) and optimized copper lead frame to dissipate 400W pulses without thermal runaway. Its DO-219AA package supports automated placement and provides 94V-0 flammability rating, enabling use in space-constrained automotive ECUs and industrial controllers requiring AEC-Q200-aligned reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line voltage. |
| VBR (min) | 24.4V - Minimum breakdown voltage at 1mA test current; ensures reliable turn-on above normal operating transients. |
| VC (max) | 35.5V - Maximum clamping voltage at 11.2A IPP; defines worst-case overvoltage seen by downstream circuitry. |
| IPP | 11.2A - Peak pulse current at VC; quantifies surge energy handling per 10/1000µs waveform. |
| PPK | 400W - Peak pulse power rating; determines survivability against lightning-induced surges and EFT bursts. |
| IR @ VRWM | 0.5µA - Reverse leakage at 22V; negligible loading on high-impedance signal paths. |
| ESD Rating | ±30kV (air/contact) per IEC61000-4-2 - Confirms robustness against human-body-model discharges in assembly and field environments. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat-lead, bi-directional TVS with cathode band omitted (no polarity marking required). Dimensions: 2.80mm × 1.90mm × 0.60mm (E × D × L), weight ≈0.016g, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during negative transients | One end of symmetrical avalanche junction; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Current entry during positive transients | Other end of symmetrical junction; connects to same line (bi-directional operation requires no polarity assignment). |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Identical VBR and VC in both polarities enables single-device protection of AC-coupled or differential buses (e.g., USB, RS-485). |
| Sub-5ns response time | Ensures clamping activation before transient energy damages sensitive IC inputs, critical for high-speed interface protection. |
| Green molding compound (94V-0) | Halogen- and antimony-free formulation meets automotive and industrial environmental compliance mandates without compromising flame resistance. |
| JEDEC-qualified high-reliability construction | Validated per AEC-Q standards for extended temperature range (–55°C to +175°C) and mechanical robustness in vibration-prone applications. |
Applications
| Automotive Battery Interface | Industrial RS-485 Transceivers |
|---|---|
Use Scenario: Protection of 12V battery feed lines in body control modules against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed between battery rail and DC-DC input, clamping transients before they reach regulator ICs. Use Value: Limits voltage to ≤35.5V during 11.2A surges, preventing damage to 36V-rated input stages and maintaining system uptime. | Use Scenario: ESD and surge protection on RS-485 bus lines in factory automation PLCs exposed to cable discharge events. IC Role / Device Role / Timing Role: TVS connected across differential pair (A/B) to shunt common-mode transients before transceiver input pins. Use Value: With ±30kV IEC61000-4-2 rating and symmetric clamping, eliminates false triggering and data corruption during electrostatic discharge events. |
| USB Type-C Power Delivery | Smart Meter Communication Ports |
Use Scenario: Overvoltage protection on VBUS and CC lines in USB PD sink adapters subjected to hot-plug and cable ESD. IC Role / Device Role / Timing Role: Bi-directional TVS mounted directly at connector, absorbing fast-rising transients before USB PD controller and port protection ICs. Use Value: Sub-5ns response ensures clamping initiates within first nanosecond of ESD event, preserving signal integrity on high-speed CC negotiation lines. | Use Scenario: Surge suppression on HPLC (power-line communication) and RF mesh network ports in utility smart meters deployed in outdoor substations. IC Role / Device Role / Timing Role: TVS installed at meter's external communication terminal block to divert induced lightning surges on low-voltage signaling lines. Use Value: 400W pulse rating and 11.2A IPP withstand repeated 10/1000µs surges typical of distribution grid switching transients. |
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 |
|---|---|---|---|
| SMAJ22CA | DO-214AC package; higher RθJA (110°C/W); 35.5V VC at 11.2A same as SMF4L22CA-7 | Larger footprint (4.5mm × 2.7mm vs. 2.8mm × 1.9mm); less suitable for ultra-dense PCB layouts | Select when legacy layout compatibility or higher surge repetition tolerance is prioritized over size. |
| TPSMF22CA | Same DO-219AA package; 33.2V VC at 12.1A; slightly tighter VBR tolerance (24.4–27.0V vs. 24.4–27.0V) | Optimized for lower clamping voltage in same form factor; identical thermal profile and ESD rating | Choose for improved voltage margin where protected IC absolute maximum rating is <35V. |
Compared with SMAJ22CA and TPSMF22CA, SMF4L22CA-7 offers the smallest footprint among 22V bi-directional TVS diodes with 400W rating, enabling miniaturized designs without sacrificing clamping performance or thermal robustness in automotive and industrial deployments.
Availability
SMF4L22CA-7 is available at Aetrix Electronics and suitable for automotive battery interfaces, industrial RS-485 transceivers, and USB Type-C power delivery systems requiring stable component supply and full traceability.
Supply support for SMF4L22CA-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q standards.
The SMF4L series belongs to Diodes' high-power surface-mount TVS portfolio, engineered specifically for compact, high-reliability transient suppression in automotive and industrial power and communication interfaces.
FAQ
Is SMF4L22CA-7 unidirectional or bidirectional?
SMF4L22CA-7 is a bi-directional TVS diode, confirmed by its part number suffix "CA" and absence of cathode band marking. Its electrical characteristics-identical VBR min/max and VC values in both polarities-are specified in the DS43394 datasheet Table on page 3, enabling symmetric protection of AC-coupled or differential signal lines without polarity concerns.
What is the maximum operating temperature for SMF4L22CA-7?
The SMF4L22CA-7 has an operating junction temperature range of –55°C to +175°C, as stated in the "Thermal Characteristics" section of DS43394 (page 2). This wide range supports deployment in under-hood automotive modules and industrial enclosures exposed to extreme ambient conditions without derating.
Does SMF4L22CA-7 meet AEC-Q200 requirements?
While SMF4L22CA-7 itself is not AEC-Q200 qualified, Diodes Incorporated states in the datasheet that "for automotive applications requiring specific change control (i.e., parts qualified to AEC-Q100/101/104/200…) please refer to the related automotive grade (Q-suffix) part." The Q-suffix variant SMF4L22CAQ-7 is the AEC-Q200 qualified version.
How does the DO-219AA package improve thermal performance over DO-214AC?
The DO-219AA package achieves RθJC = 18°C/W versus ~30°C/W for DO-214AC due to its shorter thermal path from die to solder pad and larger copper lead frame area. This allows SMF4L22CA-7 to sustain repeated 400W surges with lower junction temperature rise, extending lifetime in high-duty-cycle surge environments like industrial motor drives.
SMF4L22CA-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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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
SMF4L22CA-7 FAQ
1.How can I place an order for SMF4L22CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L22CA-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 SMF4L22CA-7 reliable?
The price and inventory of SMF4L22CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L22CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L22CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L22CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L22CA-7?
SMF4L22CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L22CA-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 SMF4L22CA-7?
For technical support, including SMF4L22CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L22CA-7 requirements.
6.How does Aetrix verify that SMF4L22CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L22CA-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 SMF4L22CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L22CA-7?
All SMF4L22CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L22CA-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 SMF4L22CA-7 part is unused and in its original packaging.
Return procedure for SMF4L22CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L22CA-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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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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