My Inquiry
My Account
Diodes Incorporated SMF4L20AQ-7
- Part No.:
- SMF4L20AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L20AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,024
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L20AQ-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in automotive power rails and battery interfaces. It features a 20 V working peak reverse voltage (VRWM), 22.2–24.5 V breakdown voltage (VBR), 32.4 V maximum clamping voltage (VC) at 12.3 A surge current, and 400 W peak pulse power dissipation (10/1000 µs waveform). It is AEC-Q101 qualified and RoHS-compliant.
For engineers reviewing the SMF4L20AQ-7 datasheet, SMF4L20AQ-7 pinout, SMF4L20AQ-7 application, or SMF4L20AQ-7 equivalent, this device is selected for high-reliability DC power line protection where fast response (<1.0 ns), low leakage (<0.5 µA), and stable clamping under repetitive transients are critical - especially in 12 V/24 V automotive subsystems and battery management circuits.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 22.2 V minimum breakdown threshold. Its DO-219AA package enables low-inductance layout and thermal performance with RθJA = 96 °C/W on standard FR-4 PCBs.
It delivers 12.3 A maximum peak pulse current (IRSM) at 32.4 V clamping, with <0.5 µA reverse leakage at 20 V VRWM and <1.0 ns response time from 0 V to VBR. The device sustains 40 A non-repetitive forward surge (IFSM) and is rated for -55°C to +175°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 20 V - Maximum continuous reverse operating voltage before clamping begins. |
| VBR (min/max) | 22.2 V / 24.5 V - Avalanche breakdown initiates within this range at 1 mA test current. |
| VC @ IRSM | 32.4 V - Clamps 12.3 A transient to ≤32.4 V, limiting downstream voltage stress. |
| PPK | 400 W - Peak pulse power handling per 10/1000 µs waveform, defining surge energy capacity. |
| IR @ VRWM | <0.5 µA - Ultra-low leakage ensures minimal standby power loss in always-on systems. |
| Response Time | <1.0 ns - Enables effective suppression of ESD and fast-rising load-dump transients. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: DO-219AA - surface-mount, flat-lead, cathode-banded unidirectional configuration; 1.90 mm width × 2.80 mm length × 0.60 mm height; matte tin-plated copper alloy leadframe; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or lower-potential rail; forms return path during clamping. |
| Cathode (banded end) | Protected line connection / high-side input | Connected to the line being protected (e.g., battery+, 12 V rail); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD rating | ±30 kV air / ±30 kV contact - meets highest system-level ESD immunity requirements without external shielding. |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant - satisfies automotive environmental compliance mandates (e.g., ELV, IMDS). |
| Thermal resistance | RθJA = 96 °C/W - enables reliable operation up to +175°C junction temperature with minimal board area. |
| Lead finish | Matte tin over copper alloy - ensures solderability per MIL-STD-202, Method 208 and compatibility with Pb-free reflow profiles. |
| PPAP capability | Full production documentation support - required for Tier-1 automotive supplier qualification and change control traceability. |
Applications
| Automotive Body Control Module (BCM) | 12 V Battery Terminal Protection |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump and jump-start transients in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12 V supply and local LDO input to clamp surges before regulation. Use Value: Limits clamped voltage to 32.4 V, preventing damage to 36 V-rated LDOs and ensuring uninterrupted MCU operation during ISO 7637-2 Pulse 5a events. |
Use Scenario: Installed directly across vehicle battery terminals to suppress ignition-induced spikes and alternator load dump. IC Role / Device Role / Timing Role: Primary front-end clamp on main battery feed, coordinated with upstream fuses and secondary TVS stages. Use Value: Withstands 400 W pulses and 40 A single-half-sine surges, enabling compliance with ISO 16750-2 Class D (12 V systems) without derating. |
| ADAS Camera Power Input | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Shields 5 V/3.3 V camera module power inputs from ESD and cable discharge events in rear-view or surround-view systems. IC Role / Device Role / Timing Role: Secondary TVS after bulk filtering, placed immediately before DC-DC converter input to protect switching controller ICs. Use Value: Sub-1 ns response and <0.5 µA leakage preserve signal integrity and minimize quiescent current in always-on vision systems. |
Use Scenario: Protects high-current H-bridge driver ICs from inductive kickback and supply rail collapse during EPS motor commutation. IC Role / Device Role / Timing Role: Parallel-mounted across motor driver VDD rail to absorb 12 V rail transients induced by PWM switching and brushless motor back-EMF. Use Value: 32.4 V clamping prevents latch-up in 36 V-rated gate drivers while maintaining >12.3 A surge margin per ISO 7637-2 Pulse 1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | DO-214AC package; higher RθJA (125 °C/W); 33.2 V VC @ 12.1 A | Larger footprint; less suitable for dense automotive PCBs; lower thermal efficiency | Prefer SMF4L20AQ-7 for space-constrained AEC-Q101 designs requiring superior thermal performance and smaller DO-219AA footprint. |
| 1.5SMC20A | DO-214AB package; 400 W rating; 32.5 V VC @ 12.3 A; higher VF (3.5 V) | Higher forward voltage increases conduction loss in bidirectional fault paths; not AEC-Q101 qualified | SMF4L20AQ-7 is preferred for automotive-grade reliability, lower leakage, and validated PPAP support. |
Compared with SMAJ20A and 1.5SMC20A, SMF4L20AQ-7 offers superior thermal resistance, AEC-Q101 qualification, and a 30% smaller footprint - making it optimal for next-generation automotive ECUs where board space, thermal headroom, and supply-chain traceability are critical.
Availability
SMF4L20AQ-7 is available at Aetrix Electronics and suitable for automotive body electronics, battery management systems, and ADAS power conditioning requiring stable component supply, full traceability, and long-term lifecycle assurance.
Supply support for SMF4L20AQ-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 components for automotive, industrial, and computing markets.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient suppression in 12 V/24 V automotive power networks - emphasizing low clamping, fast response, and green manufacturing compliance.
FAQ
What is the polarity configuration of SMF4L20AQ-7?
SMF4L20AQ-7 is a unidirectional TVS diode, indicated by the cathode band on the DO-219AA package. It conducts only in reverse breakdown mode - blocking forward current up to 3 V at 16 A, and clamping transients on the cathode-connected line relative to anode-ground reference.
Does SMF4L20AQ-7 meet automotive ESD standards?
Yes - it provides IEC61000-4-2 ESD protection rated at ±30 kV (air) and ±30 kV (contact), verified per Diodes' qualification testing. This exceeds typical automotive module requirements (e.g., ISO 10605 Level 4) and supports direct integration into exposed connectors and sensor interfaces.
Can SMF4L20AQ-7 be used in parallel for higher surge current handling?
No - TVS diodes exhibit parameter spread (e.g., VBR tolerance ±5%), causing uneven current sharing. Parallel use risks thermal runaway. For >12.3 A surge capability, select a higher-rated part (e.g., SMF4L24AQ-7) or implement staged clamping with upstream MOVs and downstream TVS devices.
What is the maximum operating temperature for continuous use?
The SMF4L20AQ-7 is rated for junction temperatures from -55°C to +175°C. At ambient temperatures up to +125°C, its 1.0 W steady-state power dissipation (PD) and 96 °C/W thermal resistance allow safe operation with appropriate PCB copper area - confirmed per Figure 3 derating curve in DS43393 Rev. 3-2.
SMF4L20AQ-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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
SMF4L20AQ-7 FAQ
1.How can I place an order for SMF4L20AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L20AQ-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 SMF4L20AQ-7 reliable?
The price and inventory of SMF4L20AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L20AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L20AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L20AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L20AQ-7?
SMF4L20AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L20AQ-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 SMF4L20AQ-7?
For technical support, including SMF4L20AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L20AQ-7 requirements.
6.How does Aetrix verify that SMF4L20AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L20AQ-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 SMF4L20AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L20AQ-7?
All SMF4L20AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L20AQ-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 SMF4L20AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L20AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L20AQ-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…
