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Diodes Incorporated SMF4L48AQ-7
- Part No.:
- SMF4L48AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L48AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,112
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Product details
Overview
SMF4L48AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection at the board-level interface. It features a 48V working peak reverse voltage (VRWM), 53.3V minimum breakdown voltage (VBR), 77.4V maximum clamping voltage (VC) at 5.2A surge current, and AEC-Q101 qualification for under-hood power line and battery contact protection.
For engineers reviewing the SMF4L48AQ-7 datasheet, SMF4L48AQ-7 pinout, SMF4L48AQ-7 application, or SMF4L48AQ-7 equivalent, this device is selected for high-reliability ESD/EMI suppression in 12V/24V automotive subsystems where fast response (<1.0ns), low leakage (<0.5μA), and IATF 16949 traceable sourcing are required.
Technical Context
This TVS operates as a unidirectional clamping device with cathode-band polarity, leveraging silicon avalanche breakdown to divert transients above VRWM while maintaining low dynamic impedance. Its DO-219AA package enables compact placement near connectors or power entry points without compromising thermal dissipation.
The device sustains 400W peak pulse power per 10/1000µs waveform, supports 40A non-repetitive forward surge current, and delivers <3V forward voltage at 16A - critical for minimizing voltage overshoot during load dump events in automotive power management circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12V/24V system bus protection. |
| VBR (min) | 53.3V @ 1mA - Confirmed avalanche onset voltage; ensures reliable triggering above normal operating range. |
| VC (max) | 77.4V @ 5.2A - Clamped voltage during worst-case surge; limits downstream IC stress to safe levels. |
| PPK | 400W (10/1000µs) - Peak transient energy handling capacity; meets ISO 7637-2 Pulse 5a requirements. |
| IR @ VRWM | <0.5μA - Ultra-low leakage preserves battery life in always-on automotive modules. |
| Response Time | <1.0ns - Enables sub-nanosecond reaction to ESD events per IEC61000-4-2 ±30kV air/contact. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling (-55°C to +175°C) and mechanical shock. |
Pinout & Package
Package: DO-219AA - ultra-thin, surface-mount molded plastic case (1.90mm × 2.80mm × 0.60mm), halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., battery feed); conducts during reverse surge when cathode is held higher. |
| Cathode (banded end) | Ground reference | Connected to chassis or system ground; defines unidirectional clamping direction and polarity marking. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Handles ISO 7637-2 load dump surges without degradation in automotive 24V systems. |
| IEC61000-4-2 ESD rating | ±30kV air / ±30kV contact - eliminates need for external ESD diodes on exposed ports. |
| Low clamping ratio (VC/VBR) | 1.45 - tight voltage control minimizes overvoltage margin required by protected ICs. |
| DO-219AA footprint | 0.016g mass and 1.9mm × 2.8mm area - enables dense layout in space-constrained ADAS and body control modules. |
| IATF 16949 manufacturing | Full traceability from wafer to tape-and-reel - satisfies OEM PPAP documentation requirements. |
Applications
| Automotive Power Distribution | Infotainment USB Interface Protection |
|---|---|
|
Use Scenario: Protecting 12V/24V supply rails feeding engine control units and lighting drivers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed upstream of DC-DC converters and LDOs. Use Value: Limits transient voltage to ≤77.4V, preventing latch-up or gate oxide damage in downstream PMICs rated for 80V max input. |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS pins in head unit and telematics modules from ESD and hot-plug surges. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100pF @ 1MHz) unidirectional clamp on VBUS rail only. Use Value: Maintains signal integrity with <1ns response while suppressing ±30kV ESD without affecting USB 480Mbps timing margins. |
| Body Control Module Inputs | Battery Management System Contacts |
|
Use Scenario: Shielding LIN bus transceivers and sensor inputs (e.g., door lock actuators) from inductive switching noise and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on each protected input line, referenced to local ground plane. Use Value: Delivers <0.5μA leakage at 48V VRWM, ensuring no measurable current drain on always-on vehicle wake-up circuits. |
Use Scenario: Guarding BMS cell monitoring connections and main battery terminals against accidental short-circuit arcs and jump-start reversals. IC Role / Device Role / Timing Role: High-energy (400W) bidirectional-capable unidirectional device used across battery sense lines. Use Value: Withstands 40A 8.3ms half-sine surge (IFSM), enabling robust protection during battery replacement procedures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Same VRWM (48V), but SMA package (larger footprint, RθJA = 110°C/W vs. 96°C/W), lower PPK (400W same), non-AEC-Q101. | Limited to industrial/commercial designs; lacks automotive qualification and tighter thermal performance. | Select when cost is prioritized over automotive compliance and board space is unconstrained. |
| TPSMD48CA | Bi-directional variant (48V VRWM), same DO-219AA package, identical PPK and clamping, AEC-Q101 qualified. | Required for AC-coupled or floating signal lines (e.g., CAN FD stubs) where polarity reversal may occur. | Choose when protecting symmetric interfaces or where reverse-bias transients are expected. |
Compared with SMAJ48A, SMF4L48AQ-7 offers superior thermal resistance and automotive qualification in a smaller footprint; versus TPSMD48CA, it provides lower capacitance and optimized unidirectional clamping for DC power rails - making it the preferred choice for battery-fed automotive subsystems.
Availability
SMF4L48AQ-7 is available at Aetrix Electronics and suitable for automotive power distribution, infotainment interface protection, and battery management system contacts requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMF4L48AQ-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 design, manufacturing, and test facilities certified to IATF 16949 and ISO 9001 standards.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive transient suppression with emphasis on low clamping, high surge robustness, and zero-defect manufacturing traceability.
FAQ
What is the maximum clamping voltage of SMF4L48AQ-7 at its rated surge current?
The maximum clamping voltage (VC) is 77.4V at 5.2A peak pulse current (IRSM), measured per the 10/1000µs waveform. This value is guaranteed across -55°C to +175°C operating junction temperature and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMF4L48AQ-7 suitable for bidirectional signal line protection?
No - SMF4L48AQ-7 is unidirectional, marked with a cathode band and specified only for DC power rail or single-polarity signal protection. For bidirectional applications like CAN or USB D+/D−, the bi-directional variant SMF4L48CAQ-7 must be used instead.
Does SMF4L48AQ-7 require derating at elevated ambient temperatures?
Yes - peak pulse power must be linearly derated above +25°C ambient, per Figure 1 in DS43393. At +85°C, the device retains ~70% of its 400W rating (280W), and at +125°C, ~45% (180W), based on thermal resistance and junction temperature limits.
How does the DO-219AA package impact PCB layout and thermal performance?
The DO-219AA package measures 1.90mm × 2.80mm with a 0.60mm profile, enabling high-density routing. Its RθJA of 96°C/W (on 1"×1" FR-4, 2oz Cu) allows efficient heat dissipation without thermal vias, and its matte tin finish ensures reliable solder joint formation per MIL-STD-202.
SMF4L48AQ-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L48AQ-7 FAQ
1.How can I place an order for SMF4L48AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L48AQ-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 SMF4L48AQ-7 reliable?
The price and inventory of SMF4L48AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L48AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L48AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L48AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L48AQ-7?
SMF4L48AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L48AQ-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 SMF4L48AQ-7?
For technical support, including SMF4L48AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L48AQ-7 requirements.
6.How does Aetrix verify that SMF4L48AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L48AQ-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 SMF4L48AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L48AQ-7?
All SMF4L48AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L48AQ-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 SMF4L48AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L48AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L48AQ-7 Tags
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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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