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Diodes Incorporated SMF4L85AQ-7
- Part No.:
- SMF4L85AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L85AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,935
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Product details
Overview
SMF4L85AQ-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive power rails and battery interfaces. It features a 85V working peak reverse voltage (VRWM), 94.4–104V breakdown voltage (VBR), 137V maximum clamping voltage (VC) at 2.9A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and RoHS-compliant.
For engineers reviewing the SMF4L85AQ-7 datasheet, SMF4L85AQ-7 pinout, SMF4L85AQ-7 application, or SMF4L85AQ-7 equivalent, key selection criteria include clamping performance under 2.9A surge, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with IEC61000-4-2 ±30kV contact/air ESD.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when transient voltage exceeds its VBR (94.4V min), it avalanches to divert surge current away from downstream circuitry while limiting voltage across the protected node to ≤137V. Its fast response (<1.0ns) ensures protection before sensitive ICs experience overstress.
The device is optimized for DC-biased lines-its unidirectional configuration blocks reverse leakage (<0.5μA at 85V) while enabling low-capacitance operation (typ. <100pF at 1MHz), making it suitable for 12V/24V automotive power domains where low parasitic loading is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 85V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for safe DC rail operation. |
| VBR (min/max) | 94.4V / 104V - Breakdown occurs within this range at 1mA test current; defines turn-on threshold tolerance band. |
| VC @ IRSM | 137V at 2.9A - Clamping voltage during 10/1000µs surge; determines worst-case overvoltage seen by protected load. |
| PPK | 400W - Peak pulse power handling (10/1000µs); supports robust protection against ISO 7637-2 Pulse 1/2/5a surges. |
| IR @ VRWM | <0.5μA - Reverse leakage at rated standoff voltage; ensures minimal quiescent power loss in always-on systems. |
| TJ Range | −55°C to +175°C - Extended junction temperature rating enables under-hood automotive deployment without derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TCT, and ESD stress per AEC standard. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (2.80mm × 1.90mm × 0.60mm), matte tin-plated copper alloy leadframe, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction (clamping mode) | Connected to protected line; conducts surge current toward ground when V > VBR. |
| Cathode (marked with band) | Reference terminal / clamping reference | Connected to system ground; establishes clamping reference point and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD protection | ±30kV air discharge, ±30kV contact discharge - meets highest industrial and automotive ESD immunity requirements. |
| Fast response time | <1.0ns (unidirectional) - activates before transient energy couples into sensitive downstream ICs. |
| Low thermal resistance | RθJA = 96°C/W on 1"×1" FR-4 PCB - enables stable operation under repeated surge events without thermal runaway. |
| Halogen- and antimony-free "Green" construction | <900ppm Br, <900ppm Cl, <1000ppm Sb - complies with global environmental regulations and OEM sustainability mandates. |
| Automotive change control | PPAP-capable, manufactured in IATF 16949-certified facilities - supports traceable production for Tier 1 automotive supply chains. |
Applications
| Automotive Body Control Module (BCM) | 12V Battery Interface Protection |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power inputs from load dump and jump-start transients in BCM subassemblies. IC Role / Device Role: Unidirectional shunt TVS placed between VBAT and GND, clamping surges up to 137V at 2.9A. Use Value: Prevents latch-up or permanent damage to 5V/3.3V logic supplies during ISO 7637-2 Pulse 5a (load dump) events. |
Use Scenario: Installed at battery connector entry point to safeguard charging circuits, fuel pump drivers, and sensor power rails. IC Role / Device Role: Primary overvoltage clamp on main 12V distribution bus, coordinated with upstream fuses and secondary TVS stages. Use Value: Limits transient voltage to ≤137V during jump-start (24V+ spikes) and alternator field decay, preserving downstream PMICs and gate drivers. |
| Infotainment Power Supply Input | Telematics Module DC-DC Input Stage |
Use Scenario: Shields USB-C PD controller, display backlight drivers, and audio amplifiers from conducted noise on vehicle accessory power (ACC). IC Role / Device Role: First-line TVS on 12V input rail feeding buck converters; placed before input filter capacitors. Use Value: Maintains <0.5μA leakage at 85V standoff to avoid battery drain in parked state while delivering 400W surge absorption. |
Use Scenario: Protects LTE/GNSS module power input against ignition-induced transients and antenna-coupled RF energy. IC Role / Device Role: Unidirectional TVS on 5V/3.3V DC-DC output stage, guarding against backfeed surges from connected peripherals. Use Value: Ensures uninterrupted cellular connectivity during engine cranking by clamping transients below 137V with <1ns response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A | DO-214AC package (larger footprint, RθJA = 65°C/W), same 85V VRWM but higher VC = 140V at 2.8A | Less space-constrained designs; higher thermal mass allows longer surge duration handling | Prefer when board layout permits larger footprint and higher clamping voltage is acceptable |
| TPSMD8.5A | Bi-directional configuration, 8.5V VRWM, lower clamping (13.7V), not AEC-Q101 qualified | Signal-line ESD protection (e.g., LIN bus), not suitable for 12V power rail clamping | Only for low-voltage bidirectional signal paths; not a functional substitute for SMF4L85AQ-7's 85V unidirectional power rail role |
Compared with SMAJ85A and TPSMD8.5A, SMF4L85AQ-7 uniquely combines AEC-Q101 qualification, DO-219AA miniaturization, 137V clamping at 2.9A, and automotive PPAP support-making it the only drop-in solution for space-limited, high-reliability 12V/24V power rail protection.
Availability
SMF4L85AQ-7 is available at Aetrix Electronics and suitable for automotive body electronics, battery management systems, and infotainment power supplies requiring stable component supply across extended product lifecycles.
Supply support for SMF4L85AQ-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 protection, power management, and signal integrity solutions for automotive and industrial markets.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient suppression in harsh automotive environments-including under-hood power distribution and battery-connected subsystems.
FAQ
What is the polarity configuration of SMF4L85AQ-7?
SMF4L85AQ-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only when the anode is more positive than the cathode by ≥94.4V, making it suitable for DC-biased power rail protection where reverse conduction must be blocked.
Does SMF4L85AQ-7 meet automotive qualification standards?
Yes-SMF4L85AQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. It undergoes full automotive stress testing including high-temperature operating life (HTOL), temperature cycling (TCT), and ESD per AEC-Q101 Rev E, supporting Tier 1 automotive design-in requirements.
How does the DO-219AA package affect thermal performance?
The DO-219AA package delivers RθJA = 96°C/W on a 1"×1" FR-4 PCB with 2 oz. copper, enabling reliable 400W surge handling without external heatsinking. Its low profile (0.60mm height) and optimized thermal path from die to solder joint support high-density automotive PCB layouts.
Can SMF4L85AQ-7 replace older SMF series devices in existing designs?
Yes-SMF4L85AQ-7 maintains pin-to-pin compatibility with legacy SMF85A in DO-219AA, offering identical electrical specs plus enhanced ESD robustness (±30kV IEC61000-4-2) and halogen-free construction. No layout or firmware changes are required for drop-in replacement in qualified automotive designs.
SMF4L85AQ-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- 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
SMF4L85AQ-7 FAQ
1.How can I place an order for SMF4L85AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L85AQ-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 SMF4L85AQ-7 reliable?
The price and inventory of SMF4L85AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L85AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L85AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L85AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L85AQ-7?
SMF4L85AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L85AQ-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 SMF4L85AQ-7?
For technical support, including SMF4L85AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L85AQ-7 requirements.
6.How does Aetrix verify that SMF4L85AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L85AQ-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 SMF4L85AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L85AQ-7?
All SMF4L85AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L85AQ-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 SMF4L85AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L85AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L85AQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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