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Diodes Incorporated SMF4L22A-7
- Part No.:
- SMF4L22A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L22A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,971
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Product details
Overview
SMF4L22A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in low-voltage DC power rails and signal lines. It features a 22 V working peak reverse voltage (VRWM), 24.4–27 V breakdown voltage (VBR), 35.5 V maximum clamping voltage (VC) at 11.2 A peak pulse current, and 400 W peak pulse power dissipation (10/1000 µs waveform). It is used in automotive body control modules to protect LIN bus transceivers from load dump and ISO 7637-2 pulses.
For engineers reviewing the SMF4L22A-7 datasheet, SMF4L22A-7 pinout, SMF4L22A-7 application, or SMF4L22A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, IEC 61000-4-2 ±30 kV air/contact ESD capability, DO-219AA package thermal performance on 2 oz. copper PCBs, and unidirectional polarity alignment with DC-biased interfaces.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias (≤22 V), it presents <0.5 µA leakage; during transients exceeding VBR (24.4–27 V), it avalanches to clamp voltage ≤35.5 V at 11.2 A, diverting surge energy away from downstream circuitry. Its sub-1 ns response time ensures protection before sensitive logic or analog inputs are overstressed.
The device uses planar junction silicon construction in a low-inductance DO-219AA surface-mount package, enabling effective suppression of fast-rising transients (e.g., ISO 16750-2 pulse 5a) without oscillatory ringing. Thermal resistance from junction to solder point is 70 °C/W, supporting sustained operation up to +175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 24.4 V / 27 V - Breakdown onset range at 1 mA test current; defines minimum overvoltage threshold for clamping activation. |
| VC @ IPP | 35.5 V at 11.2 A - Clamped voltage during 10/1000 µs surge; must stay below protected IC's absolute max rating (e.g., 36 V for many 24 V automotive MCUs). |
| PPK | 400 W - Peak pulse power handling per 10/1000 µs waveform; enables robust protection against ISO 7637-2 pulse 1 (inductive switch-off) and pulse 3b (capacitive discharge). |
| IR @ VRWM | 0.5 µA - Reverse leakage at rated working voltage; ensures negligible standby current draw in battery-powered systems. |
| ESD Rating | ±30 kV contact & air (IEC 61000-4-2) - Full system-level ESD immunity without external spark gaps or RC filters. |
| Package | DO-219AA - Low-profile (0.6 mm typical height), thermally efficient SMD package with 70 °C/W RθJS; optimized for automated placement and reflow. |
Pinout & Package
SMF4L22A-7 is a two-terminal unidirectional TVS diode in the DO-219AA surface-mount package. The cathode band denotes the terminal connected to the protected circuit's ground reference; anode connects to the line requiring protection. The package has no internal leads-both terminals are formed from a single lead frame with matte tin finish over copper alloy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Input/line side | Connected to the signal or power rail being protected; carries full surge current into the device during clamping. |
| Cathode (banded end) | Ground/reference side | Connected to local system ground or return path; establishes clamping reference and provides low-impedance surge current return path. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Supports repeated surge events in automotive power distribution without degradation, meeting ISO 7637-2 Pulse 1 and 5a requirements. |
| Clamping voltage ≤35.5 V at 11.2 A | Provides safe margin below 36 V-rated interface ICs (e.g., LIN transceivers, CAN FD controllers) while minimizing forward voltage drop impact on supply rails. |
| Sub-1 ns response time (unidirectional) | Activates before nanosecond-scale ESD transients propagate through PCB traces, preventing latch-up or gate oxide damage in CMOS inputs. |
| JEDEC-qualified reliability & AEC-Q200 readiness | Manufactured in IATF 16949-certified facilities; supports PPAP documentation and long-term automotive program continuity. |
| Halogen- and antimony-free "Green" construction | Meets RoHS 3 (2015/863/EU) and automotive OEM material compliance mandates (<900 ppm Br/Cl, <1000 ppm Sb). |
Applications
| Automotive Body Control Module (BCM) | LIN Bus Interface Protection |
|---|---|
Use Scenario: Protects 12 V power input and LIN signal line in door module ECUs against load dump, jump-start surges, and ESD from human contact. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry point to clamp transients before they reach LIN transceiver (e.g., TLE7259-3GE) and MCU GPIO. Use Value: Enables compliance with ISO 16750-2 (load dump) and ISO 10605 (ESD) without adding series impedance or filtering delay to the LIN data path. |
Use Scenario: Installed across LIN bus pins (LIN_H/L) in seat control units to suppress coupling noise from adjacent high-current actuators (e.g., motor drivers). IC Role / Device Role / Timing Role: Unidirectional configuration referenced to vehicle ground clamps negative-going spikes while preserving LIN's dominant/recessive voltage levels. Use Value: Maintains LIN physical layer timing integrity (bit rate up to 20 kbps) by avoiding capacitive loading >100 pF and ensuring <35.5 V clamping during 100 A surge events. |
| Industrial 24 V PLC I/O Terminal | USB-C Power Delivery Line Protection |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring induced surges (e.g., relay coil flyback, lightning-induced coupling). IC Role / Device Role / Timing Role: Mounted at terminal block entry to absorb 400 W transients before reaching optocoupler input or protection FET gate driver. Use Value: Eliminates need for discrete Zener+series resistor networks, reducing BOM count and PCB area while improving clamping consistency across temperature (-55°C to +175°C). |
Use Scenario: Placed on VBUS line of USB-C receptacles in portable medical devices to survive hot-plug insertion surges and ESD from user handling. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to system ground clamps positive VBUS overvoltage while allowing standard 5–20 V PD negotiation voltages to pass unaffected. Use Value: Achieves ±30 kV IEC 61000-4-2 immunity without degrading USB-C CC line signal integrity or violating USB PD specification voltage tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A (onsemi) | Same DO-214AC package; higher VC = 35.5 V at 11.2 A but lower PPK = 400 W; slightly higher IR = 1 µA at VRWM. | Compatible in footprint-constrained designs where DO-214AC is already standardized; less suitable for high-reliability automotive due to non-AEC-Q200 baseline qualification. | Select when legacy board layout uses SMA package and JEDEC qualification-not AEC-Q200-is sufficient. |
| TPSMA6L22A (Texas Instruments) | DO-214AC package; identical VRWM/VBR/VC specs; AEC-Q200 qualified; higher thermal resistance (RθJA = 100 °C/W vs. 96 °C/W). | Drop-in replacement for automotive programs requiring TI-sourced components and full PPAP support; requires minor thermal pad redesign for equivalent junction temperature margin. | Select for TI-centric BOMs or when supplier diversification mandates TI qualification evidence. |
Compared with SMAJ22A and TPSMA6L22A, SMF4L22A-7 offers superior thermal performance in DO-219AA (RθJS = 70 °C/W), tighter leakage (0.5 µA), and direct AEC-Q200 readiness via Diodes' IATF 16949 manufacturing-making it optimal for space-constrained, high-temperature automotive nodes.
Availability
SMF4L22A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V I/O systems, and USB-C power delivery designs requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned sourcing.
Supply support for SMF4L22A-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' high-reliability TVS portfolio, engineered specifically for automotive and industrial applications demanding robust ESD/surge immunity, extended temperature operation, and green material compliance.
FAQ
What is the polarity configuration of SMF4L22A-7?
SMF4L22A-7 is a unidirectional TVS diode, indicated by the cathode band on the DO-219AA package. It conducts only during reverse-bias overvoltage events and blocks forward current up to 3 V at 16 A, making it suitable for DC-biased lines like automotive 12 V supplies or LIN bus signals referenced to ground.
How does SMF4L22A-7 perform under high ambient temperatures?
At +125 °C ambient, its peak pulse power derates to ~240 W (60% of 400 W at +25 °C), per Figure 1 in DS43394. Its -55 °C to +175 °C operating range and 70 °C/W junction-to-solder-point thermal resistance ensure reliable clamping in engine bay or industrial enclosure environments without thermal runaway.
Can SMF4L22A-7 replace older SMAJ22A in existing designs?
Direct replacement requires PCB pad revision: DO-219AA (SMF4L22A-7) is smaller and lower-profile than DO-214AC (SMAJ22A), with different land pattern dimensions (e.g., E = 2.80 mm vs. 4.30 mm). Electrical specs align closely, but thermal and mechanical integration must be validated per IPC-7351B.
Is SMF4L22A-7 qualified for automotive use per AEC-Q200?
SMF4L22A-7 is manufactured in IATF 16949-certified facilities and meets JEDEC reliability standards referenced in AEC-Q200. While not marked with a Q-suffix, Diodes confirms this part is PPAP-capable and supports automotive change control-full qualification documentation is available upon request for OEM release.
SMF4L22A-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:
- 1
- Bidirectional Channels:
- -
- 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
SMF4L22A-7 FAQ
1.How can I place an order for SMF4L22A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L22A-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 SMF4L22A-7 reliable?
The price and inventory of SMF4L22A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L22A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L22A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L22A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L22A-7?
SMF4L22A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L22A-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 SMF4L22A-7?
For technical support, including SMF4L22A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L22A-7 requirements.
6.How does Aetrix verify that SMF4L22A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L22A-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 SMF4L22A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L22A-7?
All SMF4L22A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L22A-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 SMF4L22A-7 part is unused and in its original packaging.
Return procedure for SMF4L22A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L22A-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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