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Diodes Incorporated SMF4L188AQ-7
- Part No.:
- SMF4L188AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L188AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
SMF4L188AQ-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 188V working peak reverse voltage (VRWM), 209–231V breakdown voltage (VBR), 328V maximum clamping voltage (VC) at 1.2A peak pulse current, and AEC-Q101 qualification for under-hood and battery-contact applications.
For engineers reviewing the SMF4L188AQ-7 datasheet, SMF4L188AQ-7 pinout, SMF4L188AQ-7 application, or SMF4L188AQ-7 equivalent, key selection criteria include clamping performance at high VRWM, IEC 61000-4-2 ±30kV ESD robustness, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with automotive PPAP and IATF 16949 manufacturing requirements.
Technical Context
This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 209V minimum breakdown threshold, diverting surge energy to ground while limiting clamped voltage to ≤328V at 1.2A. Its fast response time (<1.0ns) ensures protection against EFT and lightning-induced transients before downstream ICs are damaged.
The device uses a planar junction structure in a molded DO-219AA package with matte tin-plated copper alloy leads, enabling low-inductance operation and stable thermal performance up to +175°C junction temperature. Its 1.0W DC power dissipation rating supports continuous leakage monitoring in always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 188V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12V/24V/48V automotive system rails. |
| VBR (min/max) | 209V / 231V - Measured at 1mA test current; defines precise avalanche onset window for predictable turn-on behavior. |
| VC @ IPP | 328V @ 1.2A - Clamped voltage during 10/1000µs surge; determines maximum stress imposed on protected circuitry. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; enables robust protection against ISO 7637-2 Pulse 1/2/5a surges. |
| IR @ VRWM | 0.5µA - Reverse leakage at rated standoff voltage; ensures minimal standby current drain in battery-critical systems. |
| ESD Rating | ±30kV contact & air per IEC 61000-4-2 - Guarantees immunity to human-body-model electrostatic discharge events. |
| TJ Range | −55°C to +175°C - Extended temperature capability supports engine control units, ADAS sensors, and powertrain ECUs. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (2.80mm × 1.90mm × 0.60mm), halogen-free, RoHS-compliant, with cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., battery feed); conducts forward during fault conditions only if misapplied. |
| Cathode | Ground reference | Connected to chassis or system ground; carries full surge current during clamping; marked by visible cathode band. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and surge testing per JESD47. |
| Low clamping ratio (VC/VBR ≈ 1.57) | Minimizes overvoltage overshoot during fast transients, reducing risk of MOSFET gate oxide failure in power stages. |
| DO-219AA thermal resistance | RθJA = 96°C/W enables >1W steady-state dissipation on standard 1"×1" FR-4 PCB with 2 oz Cu pads. |
| Lead-free & green construction | Meets RoHS 3 (2015/863/EU) and Diodes' halogen/antimony-free definition (<900ppm Br+Cl, <1000ppm Sb). |
| Fast response time | <1.0ns rise-to-clamp delay ensures protection against sub-nanosecond ESD events without propagation delay penalties. |
Applications
| Automotive Power Distribution | Battery Management Systems |
|---|---|
|
Use Scenario: Protection of 12V/24V supply inputs in body control modules, lighting drivers, and infotainment head units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and LDOs to limit input voltage excursion during ISO 7637-2 Pulse 5a events. Use Value: Withstands 400W peak surges while clamping to 328V, preventing damage to 36V-rated input capacitors and PMICs. |
Use Scenario: Surge suppression on cell monitor IC communication lines (e.g., daisy-chained UART/I²C) in EV battery packs exposed to ESD during service access. IC Role / Device Role / Timing Role: Unidirectional TVS placed between isolated CAN/UART bus and local ground to shunt ESD without disrupting DC bias. Use Value: ±30kV IEC 61000-4-2 rating ensures reliable operation after repeated hot-plug events without parameter drift. |
| Engine Control Unit Inputs | ADAS Camera Power Rails |
|
Use Scenario: Input protection for crankshaft/camshaft position sensor interfaces subjected to inductive kickback and alternator ripple in harsh under-hood environments. IC Role / Device Role / Timing Role: Standoff voltage (188V) provides margin above 14V nominal + 120V load dump peaks; clamps within 1ns to preserve signal integrity. Use Value: Low 0.5µA leakage avoids loading high-impedance sensor bias networks, maintaining measurement accuracy across −40°C to +150°C. |
Use Scenario: Front-end protection for 12V camera module power inputs in surround-view systems vulnerable to cable discharge events during vehicle assembly or field repair. IC Role / Device Role / Timing Role: First-line defense against CDM-type discharges entering via FPC connectors; placed immediately at connector entry point. Use Value: DO-219AA footprint minimizes board space while delivering same 400W surge rating as larger SMA packages-critical for compact camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A | Same VRWM (188V) and VC (328V), but SMA package (RθJA = 110°C/W), lower PPK (400W same), non-AEC-Q101 rated. | Limited to industrial/commercial use; lacks PPAP documentation and IATF 16949 traceability. | Select when automotive qualification is not required and board layout allows larger SMA footprint. |
| SMF4L180AQ-7 | Lower VRWM (180V), VBR (200–221V), VC (315V), identical DO-219AA package and AEC-Q101 status. | Better suited for 12V systems with tighter clamping margin; slightly reduced surge margin vs. 188V rail. | Choose for cost-sensitive designs where 180V standoff meets system derating requirements and 8V margin is sufficient. |
Compared with SMAJ188A and SMF4L180AQ-7, SMF4L188AQ-7 uniquely combines AEC-Q101 compliance, DO-219AA miniaturization, and 188V standoff in a single automotive-qualified solution-enabling direct replacement in safety-critical power domains without requalification.
Availability
SMF4L188AQ-7 is available at Aetrix Electronics and suitable for automotive power distribution, battery management systems, engine control unit inputs, and ADAS camera power rails requiring stable component supply with full AEC-Q101 traceability.
Supply support for SMF4L188AQ-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 with ISO/TS 16949 and IATF 16949 certified facilities.
The SMF4LxxAQ series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically for robust transient suppression in demanding vehicle subsystems-including powertrain, chassis, and electrification applications-where long-term reliability and process control are mandatory.
FAQ
Is SMF4L188AQ-7 unidirectional or bidirectional?
SMF4L188AQ-7 is unidirectional, indicated by the absence of "C" in its part number and confirmed by its cathode-band marking. It conducts only in reverse-bias avalanche mode and must be oriented with cathode toward ground. Bidirectional variants (e.g., SMF4L188CAQ-7) have symmetrical clamping in both polarities and no cathode band.
What is the maximum junction temperature and thermal resistance?
The absolute maximum junction temperature is +175°C. Thermal resistance values are RθJA = 96°C/W (junction-to-ambient, measured on 1"×1" FR-4 with 2 oz Cu), RθJL = 14°C/W (junction-to-lead), and RθJC = 18°C/W (junction-to-case). These enable reliable operation in under-hood environments when mounted per recommended pad layout.
Does SMF4L188AQ-7 meet automotive qualification standards?
Yes-SMF4L188AQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. Test reports cover HTGB, HTRB, TCT, AC/DC life test, and surge endurance per AEC-Q101 Rev D, supporting deployment in ASIL-B and ASIL-C functional safety architectures.
How does its clamping voltage compare to similar 180V–200V TVS diodes?
At 1.2A IPP, SMF4L188AQ-7 clamps to 328V-identical to SMF4L180AQ-7 (315V) and SMF4L200AQ-7 (324V) within measurement tolerance. Its clamping ratio (VC/VBR ≈ 1.57) is optimized for minimal overshoot, outperforming legacy SMAJ-series devices (typical ratio >1.65) in fast-rising transients.
SMF4L188AQ-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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- 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
SMF4L188AQ-7 FAQ
1.How can I place an order for SMF4L188AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L188AQ-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 SMF4L188AQ-7 reliable?
The price and inventory of SMF4L188AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L188AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L188AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L188AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L188AQ-7?
SMF4L188AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L188AQ-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 SMF4L188AQ-7?
For technical support, including SMF4L188AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L188AQ-7 requirements.
6.How does Aetrix verify that SMF4L188AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L188AQ-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 SMF4L188AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L188AQ-7?
All SMF4L188AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L188AQ-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 SMF4L188AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L188AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L188AQ-7 Tags
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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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