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Diodes Incorporated SMF4L100AQ-7
- Part No.:
- SMF4L100AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L100AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,634
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Product details
Overview
SMF4L100AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection in power rails and signal lines. It features a 100V working peak reverse voltage (VRWM), 111–123V breakdown voltage (VBR), 162V maximum clamping voltage (VC) at 1A, and AEC-Q101 qualification for under-hood and battery-contact applications.
For engineers reviewing the SMF4L100AQ-7 datasheet, SMF4L100AQ-7 pinout, SMF4L100AQ-7 application, or SMF4L100AQ-7 equivalent, key selection criteria include clamping performance at 1A surge, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with IEC61000-4-2 ±30kV ESD.
Technical Context
This TVS operates as a fast-acting shunt clamp during transient events, triggering when reverse voltage exceeds its 111V minimum breakdown threshold. Its sub-1ns response time ensures suppression before downstream ICs experience overstress, and its 400W peak pulse rating (10/1000µs waveform) supports robust surge handling in 12V/24V automotive systems.
The device uses planar junction technology in a low-inductance DO-219AA package, enabling stable clamping across temperature (–55°C to +175°C). Its 2.5µA max reverse leakage at VRWM minimizes standby power loss, while the cathode-band marking confirms unidirectional polarity for correct orientation on PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 100V; maximum continuous DC or RMS reverse voltage before clamping initiates |
| Breakdown Voltage (VBR) | 111–123V @ 1mA; precise voltage threshold for reliable turn-on during surges |
| Maximum Clamping Voltage (VC) | 162V @ 1A; limits voltage seen by protected circuit during worst-case 1A transient |
| Reverse Leakage Current (IR) | ≤2.5µA @ 100V; negligible standby current draw in 12V/24V battery systems |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2; meets automotive infotainment and sensor interface requirements |
| Operating Temperature | –55°C to +175°C; qualified for engine bay, powertrain, and ADAS module environments |
Pinout & Package
Package: DO-219AA - ultra-low-profile (max height 0.75mm), molded green plastic (UL 94V-0), matte tin-plated copper alloy leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms shunt path during overvoltage |
| Cathode (marked with band) | High-side connection point | Connected to protected line (e.g., 12V rail); defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 manufacturing |
| Ultra-fast response | <1.0ns turn-on time from 0V to VBR ensures protection before system-level damage occurs |
| Green construction | Halogen- and antimony-free, RoHS 3 compliant (Br+Cl <1500ppm, Sb <1000ppm) |
| Thermal efficiency | RθJA = 96°C/W enables operation up to +175°C junction temperature on standard FR-4 PCBs |
| Low capacitance | Typical junction capacitance <100pF @ 1MHz; avoids signal integrity degradation on data lines |
Applications
| Automotive Power Rail Protection | Battery Contact ESD Suppression |
|---|---|
Use Scenario: 12V/24V supply lines in engine control units (ECUs), body control modules (BCMs), and lighting drivers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between VIN and GND to limit transient voltage to ≤162V during 1A surges. Use Value: Prevents latch-up or gate oxide rupture in PMICs and microcontrollers during cold-crank or alternator load dump events. |
Use Scenario: Direct connection points between vehicle battery terminals and onboard electronics where human-handling ESD (±30kV) is likely. IC Role / Device Role / Timing Role: First-line ESD clamp on battery input traces, absorbing contact discharge before reaching fuse boxes or DC-DC converters. Use Value: Eliminates need for secondary ESD protection stages, reducing BOM count and board space in compact junction boxes. |
| Infotainment System USB/UART Lines | ADAS Camera Power Input |
Use Scenario: 5V/3.3V USB VBUS and UART signal lines in head units and telematics control units subjected to cable-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS on power and signal paths, leveraging low capacitance (<100pF) to preserve signal rise/fall times. Use Value: Maintains USB 2.0 eye diagram integrity while meeting ISO 10605 ESD immunity requirements for passenger cabin interfaces. |
Use Scenario: 12V power input to 77GHz radar or CMOS image sensor modules mounted near vehicle exterior surfaces. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of LDOs or buck converters, rated for –40°C to +105°C ambient operation. Use Value: Enables functional safety compliance (ISO 26262 ASIL-B) by guaranteeing no single-point failure during transient exposure in harsh environmental zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100A | Same VRWM (100V) but lower peak power (400W vs. SMAJ's 400W); higher clamping voltage (170V vs. 162V @ 1A) | Larger SMA package (higher RθJA = 120°C/W); less suitable for high-density automotive PCBs | Prefer SMF4L100AQ-7 for space-constrained layouts requiring superior thermal performance and tighter clamping. |
| TPSMD100A | Higher clamping voltage (177V @ 1A); same DO-219AA footprint but not AEC-Q101 qualified | Lacks PPAP support and automotive change control; limited to industrial/commercial designs | Select SMF4L100AQ-7 when automotive qualification, traceable sourcing, and lifecycle continuity are mandatory. |
Compared with SMAJ100A and TPSMD100A, SMF4L100AQ-7 delivers tighter clamping (162V), lower thermal resistance (96°C/W), and full AEC-Q101 compliance-making it the optimal choice for safety-critical automotive power rail protection where voltage margin and long-term reliability are non-negotiable.
Availability
SMF4L100AQ-7 is available at Aetrix Electronics and suitable for automotive ECUs, battery management systems, and ADAS camera modules requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for SMF4L100AQ-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 power rail and interface protection where high surge robustness, low clamping, and zero-defect reliability are essential.
FAQ
What is the polarity configuration of SMF4L100AQ-7?
SMF4L100AQ-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only during reverse-biased overvoltage events on the cathode side, making it suitable for DC power rail protection where polarity is fixed.
Does SMF4L100AQ-7 meet automotive qualification requirements?
Yes-SMF4L100AQ-7 is AEC-Q101 qualified, manufactured in IATF 16949-certified facilities, and PPAP-capable. It supports automotive change control processes and is rated for operation from –55°C to +175°C junction temperature.
How does the clamping voltage of SMF4L100AQ-7 compare to similar 100V TVS diodes?
At 1A peak pulse current, SMF4L100AQ-7 clamps to a maximum of 162V-18V lower than SMAJ100A (170V) and 15V lower than TPSMD100A (177V). This tighter clamping directly improves system-level surge margin for downstream 150V-rated components.
Can SMF4L100AQ-7 be used in bidirectional signal line protection?
No-SMF4L100AQ-7 is unidirectional only. For bidirectional protection (e.g., RS-485, CAN bus), Diodes offers the complementary SMF4L100CAQ variant, which lacks the cathode band and clamps symmetrically in both directions.
SMF4L100AQ-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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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
SMF4L100AQ-7 FAQ
1.How can I place an order for SMF4L100AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L100AQ-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 SMF4L100AQ-7 reliable?
The price and inventory of SMF4L100AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L100AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L100AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L100AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L100AQ-7?
SMF4L100AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L100AQ-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 SMF4L100AQ-7?
For technical support, including SMF4L100AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L100AQ-7 requirements.
6.How does Aetrix verify that SMF4L100AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L100AQ-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 SMF4L100AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L100AQ-7?
All SMF4L100AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L100AQ-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 SMF4L100AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L100AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L100AQ-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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