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Diodes Incorporated SMF4L30A-7
- Part No.:
- SMF4L30A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L30A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,098
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Product details
Overview
SMF4L30A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) with a 30V working peak reverse voltage, 33.3V minimum breakdown voltage, and 48.4V maximum clamping voltage at 8.3A surge current. It delivers ±30kV ESD protection per IEC61000-4-2 and is used for overvoltage protection on automotive battery contacts and power management rails.
For engineers reviewing the SMF4L30A-7 datasheet, SMF4L30A-7 pinout, SMF4L30A-7 application, or SMF4L30A-7 equivalent, this device is selected for high-reliability DC rail protection where fast clamping (<1.0ns response), low leakage (<0.5µA at 30V), and AEC-Q qualified alternatives are critical in automotive and industrial power systems.
Technical Context
This TVS diode operates as a unidirectional clamp in series with the protected line, leveraging avalanche breakdown to shunt transients above 33.3V while maintaining <0.5µA leakage at VRWM = 30V. Its DO-219AA package enables low-inductance PCB layout essential for sub-10ns response.
The device sustains 400W peak pulse power under 10/1000µs waveform, achieves thermal resistance RθJA = 96°C/W on FR-4, and supports operation from –55°C to +175°C - enabling use in under-hood automotive environments without derating below +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform; defines maximum transient energy it can absorb without failure) |
| Working Peak Reverse Voltage (VRWM) | 30V (maximum continuous DC or RMS voltage applied without significant leakage) |
| Breakdown Voltage (VBR min) | 33.3V @ 1mA (voltage at which avalanche conduction begins; sets lower bound of clamping onset) |
| Clamping Voltage (VC max) | 48.4V @ 8.3A (maximum voltage seen by protected circuit during specified surge; determines system overvoltage margin) |
| ESD Rating | ±30kV air/contact per IEC61000-4-2 (ensures robustness against human-body-model and contact discharge events) |
| Leakage Current (IR) | <0.5µA @ 30V (minimizes standby power loss and avoids false triggering in high-impedance sensing nodes) |
| Response Time | <1.0ns (enables suppression before sensitive downstream ICs experience overstress) |
Pinout & Package
Package: DO-219AA - ultra-low-profile (max height 0.75mm), molded green plastic, cathode band marked on top surface, optimized for automated placement and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to transient source (e.g., battery feed); current flows anode-to-cathode during clamping |
| Cathode | Protected load side / ground reference | Connected to system ground or low-impedance return path; establishes unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Supports high-energy load-dump and ISO 7637-2 Pulse 5a transients in 12V automotive systems |
| DO-219AA package | Reduces parasitic inductance vs. SMA/SMB, improving clamping fidelity for fast-rising ESD events |
| ±30kV IEC61000-4-2 ESD protection | Eliminates need for external ESD diodes in USB, CAN, or sensor interface lines sharing same rail |
| Low 0.5µA leakage at 30V | Enables use on always-on battery rails without measurable drain impact on 10-year shelf life |
| AEC-Q200 stress qualification support | Validated for temperature cycling, humidity bias, and vibration - suitable for PPAP-capable automotive BOMs |
Applications
| Battery Protection Circuit | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 12V lead-acid or LiFePO₄ battery input terminals against jump-start spikes and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery+ and chassis ground to clamp transients exceeding 33.3V. Use Value: Limits voltage to ≤48.4V during 8.3A surges, preventing damage to PMICs and microcontrollers downstream. | Use Scenario: Safeguarding power inputs to BCM ECUs exposed to ISO 7637-2 pulses and ESD from door switches or sensors. IC Role / Device Role / Timing Role: Primary rail protector on VBAT supply, operating alongside ceramic decoupling caps. Use Value: Withstands ≥400W pulses and ±30kV ESD without degradation, ensuring functional safety compliance. |
| Industrial Power Supply Input | Telematics Control Unit (TCU) |
Use Scenario: Guarding 24V DC input of DIN-rail mounted PLC power supplies against lightning-induced surges. IC Role / Device Role / Timing Role: First-stage transient suppressor ahead of bulk capacitor and upstream of DC-DC converter. Use Value: Fast <1.0ns response ensures clamping occurs before 100ns-rising surges propagate into regulation circuitry. | Use Scenario: Securing VCC rail of LTE/CAN/FlexRay interfaces in vehicle-mounted TCUs subject to hot-swap and antenna coupling. IC Role / Device Role / Timing Role: Rail-level TVS co-located with connector entry point to minimize loop inductance. Use Value: DO-219AA footprint allows tight placement near connectors, reducing effective clamping impedance by >30% vs. larger packages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Higher RθJA (110°C/W), SMA package (larger footprint, higher inductance), 400W rating retained | Less suitable for space-constrained automotive modules; requires larger pad layout | Select when legacy SMA footprint compatibility is required and board area is not constrained |
| SMF4L30AQ-7 | AEC-Q200 qualified version with full PPAP documentation and IATF 16949 manufacturing traceability | Mandatory for Tier-1 automotive production; supports change control and lot-level reliability reporting | Select for OEM production programs requiring automotive-grade certification and supply chain transparency |
Compared with SMAJ30A and SMF4L30AQ-7, SMF4L30A-7 offers superior high-frequency clamping due to DO-219AA's lower parasitic inductance, while retaining identical electrical specs - making it optimal for new designs prioritizing EMI performance and miniaturization over automotive qualification.
Availability
SMF4L30A-7 is available at Aetrix Electronics and suitable for automotive battery protection, industrial power supply inputs, telematics control units, and body control module designs requiring stable component supply across long product lifecycles.
Supply support for SMF4L30A-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 computing markets.
The SMF4L series belongs to Diodes' high-power surface-mount TVS portfolio, engineered specifically for demanding DC rail protection in automotive and industrial environments where compact size, fast response, and high surge tolerance are mandatory.
FAQ
What is the polarity configuration of SMF4L30A-7?
SMF4L30A-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only when the anode is more positive than the cathode by ≥33.3V, making it suitable for DC rail protection where reverse voltage is not expected.
How does SMF4L30A-7 perform under high ambient temperatures?
At +125°C ambient, its peak pulse power derates to ~70% of the 400W rating (≈280W), per Figure 1 in DS43394. Its –55°C to +175°C operating range and 96°C/W RθJA ensure reliable clamping in under-hood automotive locations without additional heatsinking.
Can SMF4L30A-7 replace SMAJ30A in existing designs?
Yes, electrically - both share identical VRWM (30V), VBR (33.3V min), and VC (48.4V max). However, the DO-219AA package of SMF4L30A-7 requires updated footprint and stencil design due to smaller dimensions (1.90 × 2.80 mm vs. SMA's 4.5 × 2.7 mm) and different pad layout.
Is SMF4L30A-7 compliant with RoHS and halogen-free standards?
Yes - it features matte tin finish on copper alloy leads, green molding compound compliant with UL 94V-0, and meets EU RoHS 2015/863/EU with bromine/chlorine <900ppm each and antimony <1000ppm, certified as "Green" per Diodes' definitions.
SMF4L30A-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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
SMF4L30A-7 FAQ
1.How can I place an order for SMF4L30A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L30A-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 SMF4L30A-7 reliable?
The price and inventory of SMF4L30A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L30A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L30A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L30A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L30A-7?
SMF4L30A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L30A-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 SMF4L30A-7?
For technical support, including SMF4L30A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L30A-7 requirements.
6.How does Aetrix verify that SMF4L30A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L30A-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 SMF4L30A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L30A-7?
All SMF4L30A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L30A-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 SMF4L30A-7 part is unused and in its original packaging.
Return procedure for SMF4L30A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L30A-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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