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Diodes Incorporated SMF4L8.5CAQ-7
- Part No.:
- SMF4L8.5CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L8.5CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,564
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Product details
Overview
SMF4L8.5CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for automotive-grade overvoltage protection on signal and power lines. It features 8.5V working peak reverse voltage (VRWM), 9.44–10.43V breakdown voltage (VBR), 14.4V maximum clamping voltage (VC) at 27.7A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and used in battery contact protection and CAN/LIN bus interfaces.
For engineers reviewing the SMF4L8.5CAQ-7 datasheet, SMF4L8.5CAQ-7 pinout, SMF4L8.5CAQ-7 application, or SMF4L8.5CAQ-7 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC, IEC61000-4-2 ±30kV ESD robustness, bi-directional surge handling capability, and DO-219AA thermal performance under automotive ambient conditions.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal lines without polarity constraints. Its low 14.4V clamping voltage at 27.7A ensures effective suppression of ISO 7637-2 pulse 1 and pulse 2b transients in 12V automotive systems.
The device delivers <1.0ns response time for unidirectional mode and <5.0ns for bi-directional mode, with junction capacitance below 200pF at 1MHz - critical for high-speed data line protection such as LIN or low-speed CAN. It is rated for -55°C to +175°C operation and manufactured in IATF 16949-certified facilities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.5V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for safe system bias. |
| VBR (min/max) | 9.44V / 10.43V - Breakdown occurs within this range at 1mA test current; defines turn-on threshold consistency. |
| VC @ IPP | 14.4V at 27.7A - Clamping voltage during 10/1000µs surge; determines maximum stress imposed on downstream circuitry. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; supports repeated transient events in automotive environments. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Ensures immunity to human-body-model ESD events without external shielding. |
| Operating Temp | -55°C to +175°C - Enables placement near engine compartments or under-hood ECUs without derating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-219AA - surface-mount, flat-lead, lead-free, halogen-free molded plastic package (UL 94V-0), 0.016g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transient | One end of symmetrical P-N junction; connects to line being protected (e.g., LIN bus line). |
| Cathode | Current entry point during positive transient | Opposite end of symmetrical P-N junction; ties to ground or common reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC or floating signals without polarity concerns - e.g., differential bus lines. |
| 400W peak pulse rating | Withstands repetitive load dump and inductive switching surges in 12V vehicle electrical systems. |
| Fast response time | <5.0ns turn-on from 0V to VBR - limits voltage overshoot before clamping engages. |
| AEC-Q101 qualification | Validated for automotive use with PPAP documentation support and change control traceability. |
| Green construction | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); RoHS 3 compliant and J-STD-020 Level 1 MSL. |
Applications
| Automotive LIN Bus Protection | 12V Battery Contact Protection |
|---|---|
Use Scenario: Protecting LIN transceiver pins against ESD and load dump-induced transients in body control modules. IC Role / Device Role / Timing Role: Bi-directional TVS placed between LIN data line and chassis ground to clamp fast-rising transients. Use Value: 14.4V clamping voltage stays well below typical LIN transceiver absolute max rating (18–24V), preventing latch-up or damage. |
Use Scenario: Safeguarding battery monitoring IC inputs and fuel pump driver circuits from jump-start spikes and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V rail input, located upstream of LDOs and microcontrollers. Use Value: 400W pulse rating handles 100ms load dump pulses up to 35V without degradation, per ISO 16750-2. |
| Infotainment USB Port ESD Guard | Smart Junction Box Power Rail Clamp |
Use Scenario: Secondary ESD protection on USB VBUS and D+/D− lines in head unit applications exposed to user-accessible ports. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS placed after primary common-mode choke to suppress differential-mode ESD. Use Value: Sub-200pF junction capacitance avoids signal integrity loss on USB 2.0 full-speed (12Mbps) links. |
Use Scenario: Distributed transient suppression on fused 12V outputs feeding lighting, HVAC, and seat control actuators. IC Role / Device Role / Timing Role: Point-of-load TVS mounted directly at fuse box output terminals to localize surge energy dissipation. Use Value: DO-219AA thermal resistance (RθJA = 96°C/W) enables stable operation at 85°C ambient without derating in sealed enclosures. |
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 |
|---|---|---|---|
| SMAJ8.5CA | DO-214AC package; higher RθJA (125°C/W); 15.0V VC @ 25.4A | Larger footprint; less suitable for dense automotive PCB layouts | Prefer when legacy layout compatibility outweighs thermal or space constraints |
| TPSMD8.5C | DO-214AB package; 14.5V VC @ 27.5A; lower leakage (0.5μA vs. 10μA) | Higher VF in forward conduction; not AEC-Q101 qualified | Select only for non-automotive industrial use where qualification is not required |
Compared with SMAJ8.5CA and TPSMD8.5C, SMF4L8.5CAQ-7 offers superior thermal performance (RθJA = 96°C/W), smaller DO-219AA footprint, and full AEC-Q101 compliance - making it the preferred choice for new automotive designs requiring high reliability and space efficiency.
Availability
SMF4L8.5CAQ-7 is available at Aetrix Electronics and suitable for automotive electronics, battery management systems, and LIN/CAN network protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF4L8.5CAQ-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 harsh automotive environments with emphasis on compact packaging and IEC61000-4-2 compliance.
FAQ
What is the polarity configuration of SMF4L8.5CAQ-7?
SMF4L8.5CAQ-7 is a bi-directional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring orientation during placement. Its marking code "TT" indicates bi-directional functionality, and no cathode band is present on the DO-219AA package body.
Does SMF4L8.5CAQ-7 meet automotive qualification standards?
Yes - SMF4L8.5CAQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. It passes high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling tests required for automotive discrete components.
How does its clamping performance compare to unidirectional variants like SMF4L8.5AQ-7?
SMF4L8.5CAQ-7 has identical VRWM (8.5V), VBR (9.44–10.43V), and VC (14.4V @ 27.7A) specs as its unidirectional counterpart but clamps in both directions. Unidirectional versions require correct polarity alignment and cannot protect AC-coupled lines, whereas the bi-directional variant eliminates orientation risk in differential or floating systems.
Can SMF4L8.5CAQ-7 be used in parallel for higher surge current handling?
No - TVS diodes should not be paralleled due to mismatched VBR tolerances causing current imbalance and premature failure. For higher surge ratings, select a single device with appropriate PPK (e.g., SMF4L12CAQ-7 for 19.9V VC @ 20.1A) or implement staged protection with upstream fusing and downstream TVS.
SMF4L8.5CAQ-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.7A
- 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
SMF4L8.5CAQ-7 FAQ
1.How can I place an order for SMF4L8.5CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L8.5CAQ-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 SMF4L8.5CAQ-7 reliable?
The price and inventory of SMF4L8.5CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L8.5CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L8.5CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L8.5CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L8.5CAQ-7?
SMF4L8.5CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L8.5CAQ-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 SMF4L8.5CAQ-7?
For technical support, including SMF4L8.5CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L8.5CAQ-7 requirements.
6.How does Aetrix verify that SMF4L8.5CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L8.5CAQ-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 SMF4L8.5CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L8.5CAQ-7?
All SMF4L8.5CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L8.5CAQ-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 SMF4L8.5CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L8.5CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L8.5CAQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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