My Inquiry
My Account
Diodes Incorporated SMF4L51AQ-7
- Part No.:
- SMF4L51AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L51AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,395
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L51AQ-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 400W peak pulse power (10/1000µs), 51V working peak reverse voltage (VRWM), and 82.4V maximum clamping voltage (VC) at 4.9A surge current. It delivers ±30kV ESD protection per IEC61000-4-2 and is AEC-Q101 qualified for automotive battery line protection.
For engineers reviewing the SMF4L51AQ-7 datasheet, SMF4L51AQ-7 pinout, SMF4L51AQ-7 application, or SMF4L51AQ-7 equivalent, this device is selected for high-reliability DC power rail surge suppression where fast response (<1.0ns), low leakage (<0.5µA), and compact surface-mount form factor are critical - especially in automotive body control modules, infotainment power inputs, and ADAS sensor supply lines.
Technical Context
This TVS operates as a unidirectional clamping device with a breakdown voltage (VBR) of 56.7–62.7V at 1mA test current, ensuring robust overvoltage triggering above nominal 51V system rails. Its junction-to-ambient thermal resistance is 96°C/W on standard FR-4 PCB, supporting sustained operation up to +175°C junction temperature.
The device uses silicon avalanche technology with a cathode band marking polarity, exhibits <0.5µA reverse leakage at VRWM, and achieves sub-nanosecond response from 0V to VBR - enabling effective suppression of EFT bursts and ISO 7637-2 load-dump transients in 12V/24V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); sustains single transient events without failure in automotive power-line applications |
| Working Peak Reverse Voltage (VRWM) | 51V; sets maximum continuous DC operating voltage before clamping activation |
| Breakdown Voltage (VBR) | 56.7–62.7V @ 1mA; defines precise turn-on threshold for overvoltage protection |
| Maximum Clamping Voltage (VC) | 82.4V @ 4.9A; limits downstream voltage stress during surge events |
| ESD Rating | ±30kV air/contact per IEC61000-4-2; eliminates need for external ESD diodes in USB/UART interfaces |
| Response Time | <1.0ns (unidirectional); ensures clamping initiates before sensitive ICs experience overvoltage damage |
| Operating Temperature | −55°C to +175°C; supports under-hood and battery-box mounting in automotive environments |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic case (1.90mm × 2.80mm × 0.60mm), halogen-free, RoHS-compliant, with matte tin-plated copper alloy leadframe and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current path during reverse-biased clamping; must be routed with minimal inductance to ground plane |
| Cathode (marked by band) | High-side connection to protected line (e.g., battery+) | Defines unidirectional polarity; connects to 51V rail requiring overvoltage protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock per IATF 16949 manufacturing controls |
| 400W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120V/100ms without degradation when properly heatsinked |
| DO-219AA footprint | Reduces board area by 40% vs. SMA packages while maintaining comparable thermal performance via optimized die attach and leadframe design |
| ±30kV ESD immunity | Eliminates secondary ESD protection components on CAN/LIN bus lines and sensor supply inputs |
| Low IR leakage | <0.5µA at 51V enables use in always-on battery circuits without measurable standby current penalty |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Input |
|---|---|
Use Scenario: Protects 12V supply input of BCM microcontroller and CAN transceivers against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly at connector entry point before LDO regulators. Use Value: Limits voltage to ≤82.4V during 120V/100ms load dump, preventing regulator latch-up and MCU brownout. |
Use Scenario: Shields USB-C PD and HDMI power rails in head unit against ESD and hot-swap transients. IC Role / Device Role / Timing Role: Primary ESD clamp on 5V/12V auxiliary power lines feeding display drivers and audio codecs. Use Value: Absorbs ±30kV contact discharge without degradation, preserving signal integrity and avoiding firmware resets. |
| ADAS Camera Sensor Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards 5V imaging sensor and MIPI interface power against cable-induced transients in rear-view camera harnesses. IC Role / Device Role / Timing Role: Localized TVS at sensor module PCB edge, adjacent to connector. Use Value: Sub-1ns response prevents pixel corruption or frame loss during EFT bursts on long coaxial cables. |
Use Scenario: Protects gate driver IC supply rails from inductive kickback during H-bridge switching in EPS motor control. IC Role / Device Role / Timing Role: Secondary clamping device parallel to bulk capacitor on 15V bias rail. Use Value: Clamps 100V+ spikes to ≤82.4V within nanoseconds, avoiding gate oxide breakdown in high-side MOSFET drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | Same VRWM (51V) and VC (85V), but SMA package (larger footprint, higher RθJA = 110°C/W) | Less suitable for space-constrained automotive modules; requires larger pad layout and reduced surge margin at high ambient | Select when legacy board redesign is impractical and thermal derating can be accommodated |
| SMCJ51A | Higher PPK (1500W), same VRWM, but DO-214AB package (5.3mm × 4.6mm); 3× larger area than DO-219AA | Better for industrial power supplies with longer surge durations, not optimized for automotive PCB real estate constraints | Choose only if system-level testing confirms need for >400W rating and board space permits |
Compared with SMAJ51A and SMCJ51A, SMF4L51AQ-7 delivers identical electrical protection performance in a 40% smaller footprint and 25% lower thermal resistance, making it the optimal choice for next-generation automotive ECUs where board area and thermal management are tightly constrained.
Availability
SMF4L51AQ-7 is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power inputs, and ADAS camera sensor supplies requiring stable component supply across extended production lifecycles.
Supply support for SMF4L51AQ-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with design centers in Asia, Europe, and the US, and manufacturing in IATF 16949-certified facilities.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive power-line transient suppression where miniaturization, reliability, and compliance with ISO 7637-2 and IEC 61000-4-2 are mandatory.
FAQ
What is the polarity configuration of SMF4L51AQ-7?
SMF4L51AQ-7 is a unidirectional TVS diode, identified by a cathode band marking on the DO-219AA package. It conducts only during reverse-bias overvoltage events on the cathode-connected line, making it suitable for protecting positive DC rails like 12V or 24V automotive supplies against negative-going transients.
Does SMF4L51AQ-7 meet automotive qualification standards?
Yes - SMF4L51AQ-7 is AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. It passes stress tests including temperature cycling, high-temperature operating life, and ESD per JESD22-A114, confirming suitability for under-hood and battery-connected automotive applications.
How does the DO-219AA package affect thermal performance?
The DO-219AA package provides a junction-to-ambient thermal resistance of 96°C/W on standard 1"×1" FR-4 with 2 oz. copper, which is 14°C/W lower than SMA packages. Its low-profile design and optimized leadframe reduce thermal impedance to the PCB, enabling higher surge endurance in confined spaces without added heatsinking.
Can SMF4L51AQ-7 replace older SMAJ51A devices in existing designs?
Yes - SMF4L51AQ-7 matches SMAJ51A's electrical specs (VRWM = 51V, VC = 82.4V vs. 85V) and offers superior thermal performance and footprint reduction. Layout adaptation is required due to DO-219AA's smaller size (1.90mm × 2.80mm vs. SMA's 4.5mm × 2.7mm), but no circuit revalidation is needed for surge protection functionality.
SMF4L51AQ-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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
SMF4L51AQ-7 FAQ
1.How can I place an order for SMF4L51AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L51AQ-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 SMF4L51AQ-7 reliable?
The price and inventory of SMF4L51AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L51AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L51AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L51AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L51AQ-7?
SMF4L51AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L51AQ-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 SMF4L51AQ-7?
For technical support, including SMF4L51AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L51AQ-7 requirements.
6.How does Aetrix verify that SMF4L51AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L51AQ-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 SMF4L51AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L51AQ-7?
All SMF4L51AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L51AQ-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 SMF4L51AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L51AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L51AQ-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…
