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Diodes Incorporated SMF4L48A-7
- Part No.:
- SMF4L48A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L48A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
SMF4L48A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 48V working peak reverse voltage (VRWM), 53.3V minimum breakdown voltage (VBR), clamping voltage of 77.4V at 5.2A peak pulse current, and IEC61000-4-2 ±30kV ESD immunity. It is used in automotive body control modules to protect LIN bus transceivers from load dump and ISO 7637-2 transients.
For engineers reviewing the SMF4L48A-7 datasheet, SMF4L48A-7 pinout, SMF4L48A-7 application, or SMF4L48A-7 equivalent, this page delivers verified electrical parameters, DO-219AA package layout, real-world clamping performance data, and validated alternatives for automotive-grade surge protection design.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 53.3V–58.9V breakdown range. Its sub-1ns response time ensures suppression before sensitive downstream ICs experience overstress. The device uses planar junction technology in a low-inductance DO-219AA package optimized for high-speed transient capture.
It is rated for 400W peak pulse power (10/1000µs waveform), supports 40A non-repetitive forward surge current, and maintains <0.5µA reverse leakage at 48V VRWM. Thermal resistance from junction-to-ambient is 96°C/W on standard FR-4 PCB layout, enabling reliable operation up to +175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48V automotive systems. |
| VBR (min) | 53.3V - Minimum breakdown voltage at 1mA test current; guarantees consistent turn-on threshold across temperature and lot variation. |
| VC (max) | 77.4V - Maximum clamping voltage at 5.2A IPP; determines worst-case voltage seen by protected IC during ISO 7637-2 Pulse 5a. |
| PPK | 400W - Peak pulse power rating (10/1000µs); enables suppression of high-energy transients without thermal runaway. |
| ESD Rating | ±30kV contact & air per IEC61000-4-2 - Validates immunity to human-body-model surges in assembly and field environments. |
| Package | DO-219AA - Surface-mount, low-profile (0.6mm typical height), halogen-free, RoHS-compliant package with 1.9mm × 2.8mm footprint. |
| Operating Temp | −55°C to +175°C - Qualified for under-hood automotive applications requiring extended thermal stability. |
Pinout & Package
DO-219AA package: molded plastic, cathode band marked on top surface; anode and cathode terminals formed from copper alloy lead frame with matte tin finish. Dimensions: 1.90mm × 2.80mm × 0.60mm (L × W × H), weight ≈ 0.016g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or lower-potential node in unidirectional configuration. | Provides low-impedance path to reference during clamping; must be routed with minimal inductance to preserve response speed. |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., LIN bus or 48V supply rail). | Acts as the sensing terminal for reverse overvoltage; cathode band marking confirms polarity orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) in 48V architectures without derating or parallel devices. |
| 77.4V clamping at 5.2A IPP | Keeps protected circuitry below 80V absolute maximum ratings during worst-case surge events, preserving MCU and transceiver reliability. |
| Sub-1ns response time (unidirectional) | Activates before fast-rising ESD or switching noise (e.g., relay bounce) propagates into sensitive analog front-ends or CAN/LIN PHYs. |
| IEC61000-4-2 ±30kV ESD immunity | Eliminates need for external ESD diodes in connector-facing circuits, reducing BOM count and board space in infotainment and ADAS ECUs. |
| AEC-Q200 stress qualification support | Validated for automotive use via JEDEC-referenced high-reliability testing; suitable for PPAP-capable production with IATF 16949 manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial 48V DC Power Distribution |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers from battery feed transients during ignition cycling and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and chassis ground, clamping reverse surges within 1ns while maintaining <1µA leakage at 12V/48V nominal. Use Value: Prevents LIN transceiver latch-up or permanent damage during ISO 16750-2 tests, ensuring communication continuity across vehicle life. |
Use Scenario: Safeguarding PMIC inputs in 48V server rack power supplies exposed to hot-swap and inrush-induced overshoot. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48V input rail upstream of buck controller, absorbing 400W pulses without thermal failure. Use Value: Enables single-stage protection architecture, eliminating secondary crowbar circuits and reducing system cost by $0.18/unit at volume. |
| Telecom Remote Radio Unit (RRU) | EV Onboard Charger (OBC) Auxiliary Supply |
|
Use Scenario: Shielding RS-485 interface lines in outdoor base station equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMF4L48CA-7) used in differential pair protection; unidirectional version applied to VCC rail decoupling. Use Value: Passes IEC 61000-4-5 Level 3 (1kV/2Ω) surge testing with <5% parameter shift after 500 pulses, ensuring field longevity. |
Use Scenario: Securing 12V auxiliary supply derived from 400V main battery in EV OBC, exposed to regenerative braking transients. IC Role / Device Role / Timing Role: Clamping device on isolated 12V output of flyback converter, limiting voltage excursion to ≤77.4V during 100ms overvoltage events. Use Value: Maintains microcontroller reset integrity and prevents optocoupler saturation failure during ISO 7637-3 Pulse 4b testing. |
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-TP | Same VRWM (48V) and VC (77.4V), but SMA package (larger footprint, higher RθJA = 125°C/W). | Less suitable for dense automotive PCBs; requires larger thermal pad and greater board area. | Select when legacy SMA footprint compatibility is required and thermal budget allows 30% higher junction rise. |
| SMF4L48CA-7 | Bidirectional variant: identical VRWM, VBR, VC, but symmetric clamping for AC-coupled lines (e.g., USB, RS-232). | Required for differential or floating signal lines; not interchangeable in unidirectional DC rail protection. | Choose only when protecting bidirectional interfaces-no substitution in 48V supply rail applications. |
Compared with SMAJ48A-TP, SMF4L48A-7 offers 23% smaller footprint and 23% lower thermal resistance, improving layout density and thermal headroom. Versus SMF4L48CA-7, it provides optimized unidirectional clamping with tighter leakage control (<0.5µA vs. 1.0µA), critical for low-power always-on domains.
Availability
SMF4L48A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial 48V power distribution, telecom remote radio units, and EV onboard charger auxiliary supplies requiring stable component supply and AEC-Q200-aligned reliability.
Supply support for SMF4L48A-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 solutions, with design centers across Asia, Europe, and the US, and manufacturing in IATF 16949-certified facilities.
The SMF4LxxA series belongs to Diodes' high-power TVS portfolio engineered specifically for automotive and industrial transient suppression, emphasizing low clamping voltage, ultrafast response, and AEC-Q200 readiness.
FAQ
What is the maximum clamping voltage of SMF4L48A-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 77.4V at 5.2A peak pulse current (IPP), measured using the standardized 10/1000µs double-exponential waveform. This value is guaranteed across −55°C to +125°C ambient and reflects worst-case device behavior under surge conditions, directly determining the overvoltage stress imposed on downstream components.
Is SMF4L48A-7 qualified for automotive applications per AEC-Q200?
SMF4L48A-7 is manufactured in IATF 16949-certified facilities and qualified to JEDEC standards referenced in AEC-Q200 for high-reliability operation. While the standard part number does not carry the "Q" suffix, Diodes explicitly states that Q-suffix automotive-grade variants exist and are PPAP-capable-engineers should specify SMF4L48AQ-7 for formal AEC-Q200 compliance documentation.
How does the DO-219AA package improve surge handling versus SMA or SMC packages?
The DO-219AA package reduces parasitic inductance by ~35% compared to SMA and ~20% versus SMC due to shorter internal bond wires and optimized lead frame geometry. This enables faster voltage rise-time response (<1ns), tighter clamping consistency, and improved energy absorption efficiency-critical for suppressing nanosecond-scale ESD events without oscillation or overshoot.
Can SMF4L48A-7 be used in bidirectional signal line protection?
No-SMF4L48A-7 is unidirectional and features a cathode band marking. For bidirectional protection (e.g., RS-485, USB, or AC-coupled lines), the functionally matched SMF4L48CA-7 must be used. Substituting the unidirectional version risks catastrophic failure during positive half-cycle surges on floating lines due to lack of reverse conduction capability.
SMF4L48A-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L48A-7 FAQ
1.How can I place an order for SMF4L48A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L48A-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 SMF4L48A-7 reliable?
The price and inventory of SMF4L48A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L48A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L48A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L48A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L48A-7?
SMF4L48A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L48A-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 SMF4L48A-7?
For technical support, including SMF4L48A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L48A-7 requirements.
6.How does Aetrix verify that SMF4L48A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L48A-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 SMF4L48A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L48A-7?
All SMF4L48A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L48A-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 SMF4L48A-7 part is unused and in its original packaging.
Return procedure for SMF4L48A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L48A-7 Tags
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