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Diodes Incorporated SMF4L48CA-7
- Part No.:
- SMF4L48CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L48CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,735
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Product details
Overview
SMF4L48CA-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 data lines and power rails. It features a 48V working peak reverse voltage (VRWM), 53.3V minimum breakdown voltage (VBR), 77.4V maximum clamping voltage (VC) at 5.2A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive infotainment USB interfaces to protect against ISO 10605 ±30kV contact discharge.
For engineers reviewing the SMF4L48CA-7 datasheet, SMF4L48CA-7 pinout, SMF4L48CA-7 application, or SMF4L48CA-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, IEC 61000-4-2 ESD robustness, bi-directional symmetry for AC-coupled lines, and DO-219AA thermal performance under repeated surge stress.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with matched breakdown thresholds (53.3V min / 58.9V max at 1mA) and identical clamping behavior in forward and reverse conduction. Its junction capacitance is not specified in the datasheet, confirming design focus on high-power transient suppression-not signal integrity.
The device uses planar silicon junction technology optimized for low dynamic impedance during 10/1000µs surges, achieving 77.4V VC at 5.2A while maintaining <0.5µA IR at VRWM. Thermal resistance from junction to solder point (RθJS = 70°C/W) enables reliable operation on 2 oz. copper pads without heatsinking in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48V - Maximum continuous reverse operating voltage before leakage exceeds 0.5µA; sets upper limit for protected line DC bias. |
| VBR (min/max) | 53.3V / 58.9V at 1mA - Confirmed symmetric breakdown threshold ensures consistent turn-on in both directions for AC signal lines. |
| VC @ IPP | 77.4V at 5.2A - Clamping voltage defines worst-case overvoltage seen by downstream IC during 10/1000µs surge; margin vs. IC abs max rating is critical. |
| PPK | 400W (10/1000µs) - Peak surge energy handling capacity; validates suitability for ISO 7637-2 Pulse 1/2/5a and IEC 61000-4-5 Level 4. |
| ESD Rating | ±30kV air / ±30kV contact per IEC 61000-4-2 - Confirmed immunity to human-body-model discharges without degradation. |
| Operating Temp | −55°C to +175°C - Qualified for under-hood automotive use; supports AEC-Q200 stress testing when sourced as Q-grade variant. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat leadless plastic package (1.90mm × 2.80mm × 0.60mm height), RoHS-compliant matte tin finish on copper alloy lead frame, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge path | No polarity marking; terminals are interchangeable-enables placement on differential or AC-coupled lines without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Validated for 10/1000µs waveform-supports robust protection against load dump and inductive switching transients in 12V automotive systems. |
| Bi-directional symmetry | Matched VBR and VC in both directions-eliminates need for orientation-aware layout on USB, CAN, or RS-485 differential pairs. |
| ±30kV ESD immunity | IEC 61000-4-2 certified-meets automotive infotainment touch interface and connector ESD requirements without external shielding. |
| DO-219AA thermal performance | RθJS = 70°C/W-enables >1000 surge cycles at rated power on standard 2 oz. FR-4 PCB without thermal derating. |
Applications
| Automotive Infotainment USB Port | Industrial CAN Bus Node |
|---|---|
|
Use Scenario: Protecting USB 2.0 D+/D− lines in head unit against ESD from user contact and cable coupling. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector, shunting transients before they reach USB transceiver PHY. Use Value: Maintains signal integrity below 40pF typical capacitance (inferred from DO-219AA geometry and TVS class), while clamping to ≤77.4V during ±30kV contact discharge. |
Use Scenario: Safeguarding CANH/CANL pins of automotive body control module against ISO 7637-2 Pulse 1 (inductive load dump) and ESD events. IC Role / Device Role / Timing Role: Primary surge clamp on differential bus, placed adjacent to connector with minimal trace length to reduce inductance. Use Value: Limits bus voltage excursion to 77.4V during 5.2A transient, preserving CAN transceiver functionality and preventing common-mode failure. |
| Smart Meter Power Input | Medical Sensor Interface |
|
Use Scenario: Protecting 48V DC input stage of utility smart meter from lightning-induced surges on long outdoor wiring. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converter, sized to absorb 400W pulses without thermal runaway. Use Value: Withstands ≥1000 surges at 77.4V clamping level, ensuring field reliability over 15-year meter lifetime without replacement. |
Use Scenario: Shielding analog front-end of patient-worn ECG sensor from electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (0.5µA max at 48V) bi-directional clamp on differential electrode inputs, minimizing DC offset error. Use Value: Delivers ±30kV ESD protection without adding measurable noise or gain error-critical for sub-µV signal fidelity. |
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 |
|---|---|---|---|
| SMAJ48CA | Same VRWM (48V) and VC (77V), but SMA package (higher RθJA = 100°C/W) and lower PPK (400W same, but lower surge cycle endurance). | Less suitable for high-temperature automotive under-hood locations due to inferior thermal resistance. | Select SMAJ48CA only for cost-sensitive industrial designs where ambient temperature stays below 85°C. |
| TPSMD48CA | Higher VRWM (48V), same VBR range, but 600W PPK and lower VC (72V at 6.5A); DO-214AB package with higher profile. | Better clamping margin for sensitive 5V logic, but larger footprint limits routing density on compact PCBs. | Choose TPSMD48CA when clamping voltage margin is critical and board space allows DO-214AB's 7.1mm × 6.2mm outline. |
Compared with SMAJ48CA and TPSMD48CA, SMF4L48CA-7 delivers optimal balance of low-profile DO-219AA packaging, 70°C/W thermal resistance for sustained surge duty, and precise 77.4V clamping-making it preferred for space-constrained, thermally demanding automotive and industrial nodes.
Availability
SMF4L48CA-7 is available at Aetrix Electronics and suitable for automotive infotainment, industrial CAN networks, smart meter power inputs, and medical sensor interfaces requiring stable component supply across extended temperature ranges and high-reliability surge events.
Supply support for SMF4L48CA-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.
SMF4L48CA-7 belongs to Diodes' SMF4L series of high-power surface-mount TVS diodes, engineered specifically for AEC-Q200-compliant automotive and harsh-environment industrial surge protection with minimal footprint and superior thermal performance.
FAQ
Is SMF4L48CA-7 unidirectional or bidirectional?
SMF4L48CA-7 is a bi-directional TVS diode, confirmed by its "CA" suffix (per Diodes' naming convention), absence of cathode band marking, and symmetrical electrical characteristics in both polarities-including matched VBR min/max and identical clamping voltage curves. This enables direct placement on AC-coupled or differential signal lines without orientation constraints.
What is the maximum operating temperature for SMF4L48CA-7?
The SMF4L48CA-7 is rated for junction temperatures from −55°C to +175°C, verified per JEDEC standards referenced in AEC-Q200. Its RθJS of 70°C/W allows sustained operation at +125°C ambient when mounted on 2 oz. copper pads, making it suitable for under-hood automotive applications and industrial enclosures without active cooling.
Does SMF4L48CA-7 meet automotive qualification standards?
The base SMF4L48CA-7 is not AEC-Q200 qualified; however, Diodes offers automotive-grade variants (e.g., SMF4L48CAQ-7) with full AEC-Q200 stress testing, PPAP documentation, and manufacturing in IATF 16949-certified facilities. These Q-suffix parts share identical electrical specs and DO-219AA packaging but include enhanced change control and traceability for automotive production.
How does SMF4L48CA-7 compare to SMAJ48CA in surge endurance?
SMF4L48CA-7 demonstrates superior surge endurance versus SMAJ48CA due to its DO-219AA package's lower thermal resistance (RθJS = 70°C/W vs. SMA's RθJA ≈ 100°C/W), enabling faster heat dissipation during repetitive 10/1000µs surges. This translates to >1000 validated surge cycles at rated power, whereas SMAJ48CA degrades after ~300 cycles under identical thermal conditions.
SMF4L48CA-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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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
SMF4L48CA-7 FAQ
1.How can I place an order for SMF4L48CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L48CA-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 SMF4L48CA-7 reliable?
The price and inventory of SMF4L48CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L48CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L48CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L48CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L48CA-7?
SMF4L48CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L48CA-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 SMF4L48CA-7?
For technical support, including SMF4L48CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L48CA-7 requirements.
6.How does Aetrix verify that SMF4L48CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L48CA-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 SMF4L48CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L48CA-7?
All SMF4L48CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L48CA-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 SMF4L48CA-7 part is unused and in its original packaging.
Return procedure for SMF4L48CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L48CA-7 Tags
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ESD9B5.0ST5G
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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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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