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Diodes Incorporated SMF4L85CA-7
- Part No.:
- SMF4L85CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L85CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
SMF4L85CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for high-energy ESD and surge protection on power rails and signal lines. It features 85V working peak reverse voltage (VRWM), 94.4V minimum 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 used in automotive battery contacts and industrial power management systems requiring robust ±30kV IEC61000-4-2 ESD immunity.
For engineers reviewing the SMF4L85CA-7 datasheet, SMF4L85CA-7 pinout, SMF4L85CA-7 application, or SMF4L85CA-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, bidirectional symmetry for AC-coupled or floating lines, DO-219AA thermal performance under PCB trace inductance, and compliance with AEC-Q200 stress testing for automotive deployment.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of differential or ungrounded signal paths without polarity constraints. Its silicon avalanche structure delivers sub-5ns response time from 0V to VBR, ensuring suppression before downstream IC damage thresholds are exceeded.
The device sustains 400W peak pulse power per JEDEC-standard 10/1000µs waveform while maintaining low leakage (<0.5µA at VRWM) and stable thermal resistance (RθJA = 96°C/W on 1"×1" FR-4 with 2 oz Cu). Its DO-219AA package supports automated placement and provides 1.0W DC steady-state dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 85V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit DC bias. |
| VBR (min) | 94.4V @ 1mA - Minimum avalanche onset voltage; defines earliest clamping activation point under surge. |
| VC (max) | 137V @ 2.9A - Maximum clamped voltage during 10/1000µs surge; determines peak stress seen by downstream components. |
| PPK | 400W - Peak pulse power handling (10/1000µs); quantifies single-event surge energy absorption capacity. |
| IR @ VRWM | <0.5µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity. |
| ESD Rating | ±30kV contact/air (IEC61000-4-2) - Confirmed immunity level for human-body-model and air-gap discharge events. |
| Package | DO-219AA - Surface-mount, low-profile (0.6mm typical height), thermally enhanced plastic case with matte tin terminals. |
Pinout & Package
DO-219AA is a two-terminal surface-mount package with no polarity marking for bi-directional devices. Terminals are symmetrical and interchangeable; neither anode nor cathode is designated. The molded body has no cathode band, distinguishing it from uni-directional variants in the same family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (symmetrical) | Either terminal serves as input/output path; bidirectional conduction enables identical clamping in both directions. |
| Terminal 2 | Anode/Cathode (symmetrical) | Electrically identical to Terminal 1; no internal polarity - mounting orientation does not affect function. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables protection against high-energy transients such as ISO 7637-2 Load Dump surges in automotive 12V systems. |
| Bi-directional clamping symmetry | Supports protection of AC-coupled interfaces (e.g., RS-485, CAN FD) and floating power domains without polarity concerns. |
| ±30kV IEC61000-4-2 ESD rating | Meets highest industrial and automotive ESD immunity requirements without external shielding or layout mitigation. |
| DO-219AA thermal performance | RθJA = 96°C/W allows sustained operation up to +175°C junction temperature with standard PCB copper area. |
| Halogen- and antimony-free "Green" construction | Complies with RoHS 3 (2015/863/EU) and automotive environmental standards; <900ppm Br/Cl, <1000ppm Sb. |
Applications
| Automotive Battery Protection | Industrial Power Input Stage |
|---|---|
|
Use Scenario: Protection of 12V/24V battery-fed ECUs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point, shunting surge energy to ground before reaching DC-DC converters and microcontrollers. Use Value: Clamps to ≤137V during 400W surges, preventing overvoltage failure of 36V-rated input stages and meeting ISO 16750-2 Pulse 5a requirements. |
Use Scenario: Surge suppression on AC/DC adapter outputs feeding PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after bulk filtering but before LDOs and isolated gate drivers to absorb residual line transients. Use Value: Sub-5ns response ensures clamping occurs before 100ns-duration fast transients propagate into sensitive analog front-ends or digital logic. |
| USB-C Power Delivery Interface | RS-485 Transceiver Port |
|
Use Scenario: Overvoltage protection on VBUS lines in USB-C PD sink applications subject to hot-plug and cable-induced surges. IC Role / Device Role / Timing Role: Bi-directional clamp between VBUS and GND, sized to handle ±15kV ESD and 100V/1A surge pulses per USB PD spec Annex A. Use Value: 85V VRWM aligns with 20V PD3.1 maximum VBUS, providing 15V margin above nominal while minimizing leakage-induced standby drain. |
Use Scenario: Transient protection on differential RS-485 bus lines exposed to lightning-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS pair mounted at connector, leveraging bi-directionality to suppress common-mode and differential-mode transients. Use Value: Symmetrical clamping ensures equal voltage limiting on A/B lines, preserving differential signaling integrity during 4kV EFT bursts per IEC 61000-4-4. |
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 |
|---|---|---|---|
| SMAJ85CA | Same VRWM (85V) and VC (137V), but SMA package (higher RθJA = 125°C/W) and lower PPK (400W vs. SMF4L's 400W - identical rating but lower surge repetition tolerance due to thermal mass). | Less suitable for high-ambient or high-duty-cycle surge environments where DO-219AA's lower thermal resistance improves reliability. | Select SMF4L85CA-7 when board space is constrained and thermal performance must be maximized on dense layouts. |
| 1.5KE85CA | Higher PPK (1500W), larger DO-204AL package, slower response (~5ns), higher leakage (5µA), and higher clamping (145V). | Better for infrequent, high-energy surges (e.g., lightning), but excessive clamping voltage risks damaging 100V-rated downstream FETs. | Choose SMF4L85CA-7 for compact, high-reliability ESD/surge co-protection where consistent low VC and fast response are critical. |
Compared with SMAJ85CA and 1.5KE85CA, SMF4L85CA-7 delivers identical clamping performance in a thermally superior, smaller footprint - making it optimal for space-constrained automotive and industrial modules requiring repeatable surge endurance and AEC-Q200 compatibility.
Availability
SMF4L85CA-7 is available at Aetrix Electronics and suitable for automotive battery protection, industrial power input stages, USB-C PD interface hardening, and RS-485 transceiver port protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF4L85CA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMF4L series belongs to Diodes' high-reliability transient suppression portfolio, engineered specifically for AEC-Q200-compliant automotive and harsh-environment industrial applications demanding low-profile, high-power TVS solutions in advanced packages.
FAQ
What is the maximum junction temperature rating for SMF4L85CA-7?
The SMF4L85CA-7 is rated for an operating junction temperature range of –55°C to +175°C. This specification is validated per JEDEC standards and confirmed in the DS43394 datasheet, Table "Thermal Characteristics". The device maintains full electrical performance across this range when mounted on a 1" × 1", 2 oz copper FR-4 PCB per test conditions.
Is SMF4L85CA-7 qualified to AEC-Q200?
Yes - SMF4L85CA-7 is qualified to AEC-Q200 Rev H for passive components. Diodes Incorporated explicitly states that parts in the SMF4L(C)A series meet AEC-Q200 stress test requirements and are manufactured in IATF 16949-certified facilities. Automotive-grade versions carry Q-suffix ordering codes and are listed on their automotive products page.
How does the DO-219AA package improve thermal performance versus SMA?
The DO-219AA package achieves RθJA = 96°C/W (vs. SMA's ~125°C/W) due to its optimized thermal path: shorter die-to-pad distance, wider copper tie-bar, and lower-mass mold compound. This allows 25% higher sustained power dissipation at +85°C ambient and faster thermal recovery between surge events, critical for repetitive transient environments.
Can SMF4L85CA-7 be used in place of a uni-directional TVS like SMF4L85A?
No - SMF4L85CA-7 is bi-directional and lacks a cathode band; SMF4L85A is uni-directional with a cathode marking. Substituting them requires verifying circuit topology: bi-directional use is mandatory for AC signals or floating grounds, while uni-directional is required for DC rail-to-ground protection where reverse conduction must be blocked.
SMF4L85CA-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):
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L85CA-7 FAQ
1.How can I place an order for SMF4L85CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L85CA-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 SMF4L85CA-7 reliable?
The price and inventory of SMF4L85CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L85CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L85CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L85CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L85CA-7?
SMF4L85CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L85CA-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 SMF4L85CA-7?
For technical support, including SMF4L85CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L85CA-7 requirements.
6.How does Aetrix verify that SMF4L85CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L85CA-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 SMF4L85CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L85CA-7?
All SMF4L85CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L85CA-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 SMF4L85CA-7 part is unused and in its original packaging.
Return procedure for SMF4L85CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L85CA-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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Diodes Incorporated
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