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Diodes Incorporated SMF4L51CA-7
- Part No.:
- SMF4L51CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L51CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,410
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Product details
Overview
SMF4L51CA-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 51V working peak reverse voltage (VRWM), 56.7–62.7V breakdown voltage (VBR), 82.4V maximum clamping voltage (VC) at 4.9A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive battery contacts and industrial I/O interfaces requiring robust ±30kV IEC61000-4-2 ESD immunity.
For engineers reviewing the SMF4L51CA-7 datasheet, SMF4L51CA-7 pinout, SMF4L51CA-7 application, or SMF4L51CA-7 equivalent, this page delivers verified electrical parameters, DO-219AA terminal mapping, real-world clamping performance data, and validated alternatives for automotive-grade overvoltage protection design.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with no cathode band marking, enabling bidirectional surge suppression without polarity dependency. Its silicon avalanche structure delivers sub-5ns response time from 0V to VBR min, ensuring fast clamping during fast-rising transients such as ESD or inductive switching spikes.
The device sustains 400W peak pulse power under standardized 10/1000µs waveform while maintaining low leakage (<0.5µA at VRWM) and stable thermal resistance (RθJA = 96°C/W). It is qualified per JEDEC reliability standards and supports automotive applications when sourced as Q-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 51V - Maximum continuous reverse operating voltage before clamping begins; defines safe standoff for 48V automotive systems. |
| VBR (min/max) | 56.7V / 62.7V - Breakdown occurs within this range at 1mA test current; ensures predictable turn-on margin above VRWM. |
| VC @ IRSM | 82.4V - Clamping voltage at 4.9A peak surge current; limits downstream voltage stress during 400W transient events. |
| PPK | 400W - Peak pulse power handling (10/1000µs waveform); enables protection against ISO 7637-2 Pulse 1/2a/3a surges. |
| ESD Rating | ±30kV contact & air (IEC61000-4-2) - Full system-level ESD immunity without external shielding or filtering. |
| Leakage Current | <0.5µA at VRWM - Negligible standby power loss and signal integrity impact in always-on circuits. |
| Package | DO-219AA - Surface-mount, low-profile (0.6mm typical height), RoHS-compliant, halogen-free "Green" molding compound. |
Pinout & Package
DO-219AA is a two-terminal surface-mount package with symmetrical terminals; no polarity marking indicates bi-directional operation. Terminals are matte tin-finished copper alloy, solderable per MIL-STD-202 Method 208, and rated for 3000 pcs/reel tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Cathode Tab (N/A) | N/A - Bi-directional device | No cathode band marking; eliminates risk of reverse installation error in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Supports ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2a (battery disconnect) in 12V/24V automotive networks. |
| ±30kV IEC61000-4-2 ESD protection | Eliminates need for secondary ESD components on CAN, LIN, or sensor interface lines in automotive ECUs. |
| Sub-5ns response time | Clamps transients before sensitive IC inputs reach destructive voltage thresholds-critical for high-speed serial links. |
| DO-219AA footprint | 0.81–1.20mm A dimension enables compact placement near connectors or board edges where surges enter. |
| Halogen- and antimony-free | Meets automotive OEM green material requirements (Br+Cl <1500ppm, Sb <1000ppm) without compromising surge robustness. |
Applications
| Automotive Battery Interface | Industrial Sensor Signal Line |
|---|---|
Use Scenario: Protection of 12V/24V battery feed lines against load dump and jump-start transients in body control modules. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to shunt surge energy before reaching PMIC or MCU power rails. Use Value: Withstands 400W pulses and clamps to ≤82.4V, preventing overvoltage damage to downstream 36V-rated regulators and microcontrollers. |
Use Scenario: ESD protection on analog sensor outputs (e.g., temperature, pressure) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bi-directional TVS placed adjacent to connector pins to absorb ±30kV contact discharge without signal distortion. Use Value: Low 0.5µA leakage preserves mV-level sensor accuracy; DO-219AA size allows placement within 2mm of I/O pad for optimal high-frequency transient capture. |
| USB-C Power Delivery Port | RS-485 Communication Bus |
Use Scenario: Overvoltage protection on VBUS line of USB-C receptacles exposed to hot-plug and adapter fault conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS that remains non-conductive during normal 5–20V PD operation but clamps fast-rising faults to safe levels. Use Value: 51V VRWM accommodates 20V PD profiles; 82.4V VC ensures connected devices (e.g., USB-PD controllers) stay within absolute maximum ratings. |
Use Scenario: Surge protection on differential RS-485 bus lines in building management systems subject to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Bi-directional clamping element across A/B lines to limit common-mode transients while preserving differential signaling integrity. Use Value: Symmetric clamping prevents DC bias shift; 4.9A IRSM rating handles IEC 61000-4-5 Level 3 (1kV/42Ω) surge tests. |
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 |
|---|---|---|---|
| SMAJ51CA-TP | Same VRWM (51V), higher VC (87.1V), lower PPK (400W same), SMA package (larger, higher RθJA). | Less effective clamping margin in space-constrained designs; requires larger PCB area and has slower thermal recovery. | Choose only if DO-219AA footprint is incompatible and board layout allows SMA's 4.5mm × 2.7mm outline. |
| 1.5KE51CA | Same VRWM (51V), higher VC (85V), same PPK (400W), axial DO-201 package (through-hole, higher inductance). | Unsuitable for high-frequency transients due to lead inductance; not compatible with automated SMT assembly. | Select only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMAJ51CA-TP and 1.5KE51CA, SMF4L51CA-7 offers superior high-frequency surge response via its low-inductance DO-219AA package, tighter clamping (82.4V vs. ≥85V), and optimized thermal performance for dense automotive PCB layouts.
Availability
SMF4L51CA-7 is available at Aetrix Electronics and suitable for automotive battery interfaces, industrial sensor signal lines, USB-C power delivery ports, and RS-485 communication buses requiring stable component supply and full IEC61000-4-2 compliance.
Supply support for SMF4L51CA-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.
The SMF4L series belongs to Diodes' high-power surface-mount TVS portfolio, engineered specifically for AEC-Q qualified automotive applications and compact industrial electronics needing robust, low-profile transient suppression.
FAQ
Is SMF4L51CA-7 unidirectional or bidirectional?
SMF4L51CA-7 is a bi-directional TVS diode, indicated by the "C" suffix and absence of cathode band marking. It provides symmetrical clamping for positive and negative transients, making it ideal for AC-coupled or differential signal lines like RS-485 or USB-C VBUS where polarity reversal may occur during fault conditions.
What is the maximum clamping voltage at rated surge current?
The maximum clamping voltage (VC) for SMF4L51CA-7 is 82.4V at 4.9A peak reverse surge current (IRSM), measured using the standard 10/1000µs double-exponential waveform. This value ensures protected circuits remain below critical overvoltage thresholds during worst-case surge events.
Does SMF4L51CA-7 meet automotive qualification standards?
SMF4L51CA-7 itself is not AEC-Q200 qualified, but Diodes offers automotive-grade equivalents (e.g., SMF4L51CAQ-7) manufactured in IATF 16949-certified facilities and qualified to AEC-Q200. The base part meets JEDEC high-reliability standards and shares identical electrical specs and DO-219AA construction.
How does DO-219AA compare to SMA in surge performance?
DO-219AA offers lower parasitic inductance and better thermal dissipation than SMA due to shorter internal leads and optimized die attach. This results in faster response (<5ns), tighter clamping (82.4V vs. 87.1V for SMAJ51CA), and improved reliability under repeated surge stress in compact automotive modules.
SMF4L51CA-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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
SMF4L51CA-7 FAQ
1.How can I place an order for SMF4L51CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L51CA-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 SMF4L51CA-7 reliable?
The price and inventory of SMF4L51CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L51CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L51CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L51CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L51CA-7?
SMF4L51CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L51CA-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 SMF4L51CA-7?
For technical support, including SMF4L51CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L51CA-7 requirements.
6.How does Aetrix verify that SMF4L51CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L51CA-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 SMF4L51CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L51CA-7?
All SMF4L51CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L51CA-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 SMF4L51CA-7 part is unused and in its original packaging.
Return procedure for SMF4L51CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L51CA-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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