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Diodes Incorporated SMF4L188CAQ-7
- Part No.:
- SMF4L188CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L188CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:5,647
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Product details
Overview
SMF4L188CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 188V working peak reverse voltage (VRWM), 209–231V breakdown voltage (VBR), and 328V maximum clamping voltage (VC) at 1.2A peak pulse current. It delivers 400W peak pulse power (10/1000µs waveform) with <5.0ns response time and meets IEC61000-4-2 ±30kV ESD immunity. Used for automotive battery contact and power rail surge protection.
For engineers reviewing the SMF4L188CAQ-7 datasheet, SMF4L188CAQ-7 pinout, SMF4L188CAQ-7 application, or SMF4L188CAQ-7 equivalent, key selection criteria include clamping voltage margin vs. system rail, bi-directional surge handling capability, AEC-Q101 qualification status, and DO-219AA thermal performance under repetitive transients.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or floating signal/power lines without polarity dependency. Its silicon avalanche structure ensures sub-5ns response from 0V to VBR, with clamping initiated before downstream ICs experience overvoltage stress.
Designed for automotive-grade reliability, it supports continuous operation from –55°C to +175°C junction temperature and is manufactured in IATF 16949-certified facilities. The device's low leakage (<0.5µA at VRWM) minimizes standby power loss in always-on battery-connected systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 188V - Maximum continuous reverse voltage before conduction; sets upper limit for protected circuit operating voltage. |
| VBR (min/max) | 209V / 231V - Breakdown occurs within this range at 1mA test current; defines onset of clamping behavior. |
| VC @ IPP | 328V @ 1.2A - Clamped voltage during 10/1000µs surge; determines worst-case overvoltage seen by downstream components. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; quantifies single-event surge energy absorption capacity. |
| ESD Rating | ±30kV air / ±30kV contact (IEC61000-4-2) - Confirms suitability for high-ESD environments like automotive assembly lines or exposed connectors. |
| TJ Range | –55°C to +175°C - Enables deployment in engine bay, battery modules, and other high-temperature automotive zones. |
| IR @ VRWM | <0.5µA - Ultra-low reverse leakage preserves battery life in always-on vehicle subsystems (e.g., telematics, alarm). |
Pinout & Package
Package: DO-219AA - surface-mount, flat lead, molded plastic case with matte tin finish on copper alloy leadframe; moisture sensitivity level 1 (J-STD-020); weight ≈0.016g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Current entry point during negative transients | Enables symmetrical clamping for bi-directional surges; no polarity marking required. |
| Cathode (non-banded end) | Current entry point during positive transients | Same physical terminal as anode due to bi-directional construction; terminals are functionally identical. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping architecture | Protects AC-coupled or floating nodes (e.g., CAN bus, sensor bridges) without external polarity management. |
| AEC-Q101 qualification | Validated for automotive underhood and battery applications including thermal cycling, humidity, and mechanical shock. |
| Green molding compound (UL 94V-0) | Halogen- and antimony-free formulation meets global environmental compliance (RoHS 3, ELV) without compromising flame resistance. |
| Fast response time <5.0ns | Clamps transients before propagation into sensitive analog or digital ICs, reducing need for additional filtering stages. |
| DO-219AA thermal resistance (RθJA = 96°C/W) | Enables higher sustained power dissipation than SMA/SMB packages in space-constrained PCB layouts. |
Applications
| Battery Management System (BMS) Protection | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Protects 12V/24V battery input to BMS controller against load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt >100V transients before reaching LDOs and MCU rails. Use Value: 328V VC ensures MOSFET gate drivers and ADC references remain below absolute maximum ratings during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields USB-C PD and display power supplies in head units from ignition-induced spikes. IC Role / Device Role / Timing Role: Bi-directional TVS on VBUS line to absorb both positive and negative polarity transients from shared ground paths. Use Value: Sub-5ns response prevents latch-up in USB PD controllers during fast-rising alternator noise bursts. |
| Electric Power Steering (EPS) Motor Driver | On-Board Charger (OBC) DC Link |
Use Scenario: Guards H-bridge gate driver ICs against inductive kickback from EPS motor windings. IC Role / Device Role / Timing Role: Placed across half-bridge supply rails to clamp flyback voltage during PWM switching transitions. Use Value: 400W PPK rating sustains repeated 10/1000µs surges common in high-dynamic torque control loops. | Use Scenario: Suppresses switching transients on 400V DC link between rectifier and inverter stage in EV OBC. IC Role / Device Role / Timing Role: Secondary clamping device parallel to bulk capacitor to reduce voltage overshoot during IGBT turn-off. Use Value: 188V VRWM allows direct placement on 200V-rated film capacitors while maintaining 12% safety margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188CA | DO-214AC package; higher RθJA (125°C/W); same VRWM/VBR/VC specs. | Larger footprint; lower thermal efficiency in high-density automotive PCBs. | Choose when legacy layout compatibility outweighs thermal performance needs. |
| TPSMD188C | DO-214AB package; 350W PPK; slightly higher VC (340V @ 1.2A). | Lower surge energy handling; less margin for ISO 7637-2 Pulse 5b compliance. | Select only for cost-sensitive non-safety-critical 12V systems with verified transient profiles. |
Compared with SMAJ188CA and TPSMD188C, SMF4L188CAQ-7 offers superior thermal performance in a smaller DO-219AA outline and guaranteed AEC-Q101 qualification-critical for modern EPS, BMS, and OBC designs requiring long-term reliability under thermal cycling.
Availability
SMF4L188CAQ-7 is available at Aetrix Electronics and suitable for automotive battery protection, electric power steering systems, on-board chargers, and infotainment power rails requiring stable component supply across extended product lifecycles.
Supply support for SMF4L188CAQ-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 integrated circuits, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMF4Lxx(C)AQ series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for AEC-Q101 compliance and high-reliability transient suppression in harsh environment applications such as engine control, ADAS, and electrified powertrain systems.
FAQ
Is SMF4L188CAQ-7 unidirectional or bidirectional?
SMF4L188CAQ-7 is a bi-directional TVS diode, confirmed by its part number suffix "C" (per Diodes' naming convention) and absence of cathode band marking. It provides symmetrical clamping for both positive- and negative-polarity transients, making it suitable for AC-coupled interfaces and floating power domains without polarity constraints.
What does the "AQ" suffix indicate in SMF4L188CAQ-7?
The "AQ" suffix denotes AEC-Q101 qualification and PPAP capability, indicating that the device has passed stress testing for automotive applications including temperature cycling, humidity, and mechanical shock. It also confirms manufacture in IATF 16949-certified facilities and full RoHS 3 compliance with halogen- and antimony-free materials.
Can SMF4L188CAQ-7 replace SMAJ188CA in existing designs?
Yes, SMF4L188CAQ-7 is a functional replacement for SMAJ188CA with identical electrical specifications (VRWM, VBR, VC, PPK), but requires PCB footprint revision due to DO-219AA vs. DO-214AC packaging. Its lower thermal resistance improves reliability in thermally dense automotive modules, though requalification per AEC-Q100 may be needed for safety-critical systems.
What is the maximum operating temperature for continuous use?
The SMF4L188CAQ-7 supports continuous operation up to +175°C junction temperature, validated per AEC-Q101. At ambient temperatures above +125°C, derating applies per Figure 1 in DS43393 - e.g., at +150°C TA, peak pulse power drops to ~220W. This enables direct mounting near battery terminals or motor drivers without forced cooling.
SMF4L188CAQ-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:
- -
- Bidirectional Channels:
- 1
- 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
SMF4L188CAQ-7 FAQ
1.How can I place an order for SMF4L188CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L188CAQ-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 SMF4L188CAQ-7 reliable?
The price and inventory of SMF4L188CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L188CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L188CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L188CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L188CAQ-7?
SMF4L188CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L188CAQ-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 SMF4L188CAQ-7?
For technical support, including SMF4L188CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L188CAQ-7 requirements.
6.How does Aetrix verify that SMF4L188CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L188CAQ-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 SMF4L188CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L188CAQ-7?
All SMF4L188CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L188CAQ-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 SMF4L188CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L188CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L188CAQ-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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D5V0H1B2LP-7B
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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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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