My Inquiry
My Account
Diodes Incorporated SMF4L30AQ-7
- Part No.:
- SMF4L30AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L30AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,901
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L30AQ-7 from Diodes Incorporated is a unidirectional 30V standoff transient voltage suppressor (TVS) diode in DO-219AA package, rated for 400W peak pulse power (10/1000µs), 48.4V max clamping voltage at 8.3A surge current, and AEC-Q101 qualified for automotive battery line protection.
For engineers reviewing the SMF4L30AQ-7 datasheet, SMF4L30AQ-7 pinout, SMF4L30AQ-7 application, or SMF4L30AQ-7 equivalent, key selection criteria include clamping voltage margin vs. protected IC VMAX, IPP derating above +25°C, unidirectional polarity for DC rail use, and DO-219AA thermal resistance (RθJA = 96°C/W) on FR-4 PCBs.
Technical Context
This TVS operates as a fast-acting shunt clamp during ESD or lightning-induced transients, triggering when reverse voltage exceeds 33.3V (VBR min) and limiting voltage to ≤48.4V at 8.3A. Its <1.0ns response time ensures protection before downstream IC damage occurs.
Designed for automotive-grade reliability, it meets IEC61000-4-2 ±30kV air/±30kV contact ESD immunity, supports 40A non-repetitive forward surge (8.3ms half-sine), and maintains <0.5μA leakage at 30V VRWM - critical for low-power always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 30V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 33.3–36.8V @ 1mA - Confirmed trigger threshold range for transient suppression |
| Clamping Voltage (VC) | 48.4V @ 8.3A - Peak voltage seen by protected circuit during worst-case 10/1000µs surge |
| Peak Pulse Power | 400W (10/1000µs) - Sustained energy absorption capability without failure |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Validated system-level ESD robustness |
| Leakage Current | <0.5μA @ 30V - Negligible standby power loss in battery-powered systems |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and infotainment applications per stress test requirements |
Pinout & Package
Package: DO-219AA surface-mount molded plastic case (UL 94V-0), 2.8mm × 1.9mm footprint, 0.6mm typical height, cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected DC line (e.g., battery +) | Connected to source of transient energy; carries full surge current during clamping |
| Cathode | Ground reference node (cathode band marked) | Provides low-impedance path to ground during overvoltage events; defines unidirectional conduction |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant with PPAP support and IATF 16949 manufacturing - enables direct use in Tier-1 automotive BOMs |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant (Br+Cl <1500ppm, Sb <1000ppm) - meets global environmental compliance mandates |
| Thermal performance | RθJA = 96°C/W on 1"×1" FR-4 board - enables reliable operation up to +125°C ambient in engine bay designs |
| Fast transient response | <1.0ns turn-on time from 0V to VBR - prevents sub-nanosecond ESD pulses from reaching sensitive CAN/LIN transceivers |
| High surge tolerance | 40A IFSM (8.3ms half-sine) - withstands load dump surges in 12V vehicle electrical systems |
Applications
| Battery Protection Circuit | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: 12V lead-acid battery input to telematics control unit exposed to ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery+ and DC-DC converter input to clamp surges before regulation stage. Use Value: Limits voltage to ≤48.4V during 8.3A transients, protecting 42V-rated input capacitors and enabling single-stage 12V→3.3V conversion without overvoltage shutdown. | Use Scenario: Power supply input to head unit MCU and display driver ICs subject to ESD from user interface connectors. IC Role / Device Role / Timing Role: Primary ESD clamp on main 5V/3.3V power rail upstream of LDO regulators. Use Value: Absorbs ±30kV contact ESD per IEC61000-4-2 without latch-up, maintaining <0.5μA leakage to preserve sleep-mode current budget. |
| Body Control Module (BCM) Input | ADAS Camera Power Interface |
Use Scenario: LIN bus power input in door module exposed to cable discharge events and alternator ripple. IC Role / Device Role / Timing Role: Secondary TVS on 12V auxiliary rail feeding LIN transceiver and window motor drivers. Use Value: Clamps 10/1000µs surges to 48.4V while dissipating 400W peak power, preventing false LIN frame errors during door actuation. | Use Scenario: 12V input to rear-view camera module mounted near bumper, subject to repeated ESD from chassis contact. IC Role / Device Role / Timing Role: First-line protection on camera power entry point before buck converter and image sensor. Use Value: Withstands ≥1000 ESD strikes at ±30kV without parameter shift, ensuring long-term reliability in high-humidity exterior environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | DO-214AC package; higher RθJA (110°C/W); 400W rating same; VC = 48.4V @ 8.3A identical | Larger footprint (4.5mm × 2.7mm vs. 2.8mm × 1.9mm); less suitable for space-constrained ADAS modules | Select SMAJ30A only if legacy DO-214AC layout exists; SMF4L30AQ-7 offers 35% smaller area and better thermal performance. |
| TPSMD30A | DO-214AB package; 600W rating; VC = 49.9V @ 12.3A; higher leakage (1.0μA @ 30V) | Higher surge capacity but larger size and double leakage - trade-off for cost-sensitive non-automotive industrial use | Choose TPSMD30A for non-automotive 12V systems needing extra margin; SMF4L30AQ-7 preferred where AEC-Q101, size, and leakage are critical. |
Compared with SMAJ30A and TPSMD30A, SMF4L30AQ-7 delivers identical clamping performance in a 35% smaller footprint with automotive qualification and half the leakage current - making it optimal for next-gen compact, battery-sensitive automotive electronics.
Availability
SMF4L30AQ-7 is available at Aetrix Electronics and suitable for automotive battery protection, infotainment power rails, body control modules, and ADAS camera interfaces requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMF4L30AQ-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 centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio targeting automotive power line protection, engineered specifically to meet stringent ISO 7637-2 and IEC61000-4-2 requirements in space-constrained ECUs.
FAQ
Is SMF4L30AQ-7 bidirectional or unidirectional?
SMF4L30AQ-7 is unidirectional, indicated by the absence of "C" in its part number (vs. SMF4L30CAQ-7). It features a cathode band marking and conducts only during reverse overvoltage events on DC lines - ideal for protecting positive rails referenced to ground.
What is the maximum operating temperature for SMF4L30AQ-7?
The device operates from –55°C to +175°C junction temperature. At +125°C ambient, its 400W peak pulse power is derated to ~280W per Figure 1 in DS43393, maintaining full functionality in under-hood automotive environments.
Does SMF4L30AQ-7 require a heatsink for 400W pulse handling?
No external heatsink is required for single-pulse 400W events due to its short duration (10/1000µs). The DO-219AA package's RθJA = 96°C/W ensures safe junction temperature rise within limits when mounted on standard 1"×1" FR-4 PCB with 2 oz. copper.
How does SMF4L30AQ-7 differ from standard SMAJ30A in layout compatibility?
SMF4L30AQ-7 uses DO-219AA (2.8mm × 1.9mm), while SMAJ30A uses DO-214AC (4.5mm × 2.7mm). Their pad layouts are incompatible - redesigning the footprint is required to migrate, but the smaller size enables denser placement near connectors and IC power pins.
SMF4L30AQ-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L30AQ-7 FAQ
1.How can I place an order for SMF4L30AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L30AQ-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 SMF4L30AQ-7 reliable?
The price and inventory of SMF4L30AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L30AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L30AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L30AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L30AQ-7?
SMF4L30AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L30AQ-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 SMF4L30AQ-7?
For technical support, including SMF4L30AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L30AQ-7 requirements.
6.How does Aetrix verify that SMF4L30AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L30AQ-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 SMF4L30AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L30AQ-7?
All SMF4L30AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L30AQ-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 SMF4L30AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L30AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L30AQ-7 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
