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Diodes Incorporated SMF4L170CA-7
- Part No.:
- SMF4L170CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L170CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,176
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Product details
Overview
SMF4L170CA-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 and signal lines. It features a 170V working peak reverse voltage (VRWM), 189–209V breakdown voltage (VBR), 275V maximum clamping voltage (VC) at 1.4A 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 SMF4L170CA-7 datasheet, SMF4L170CA-7 pinout, SMF4L170CA-7 application, or SMF4L170CA-7 equivalent, key selection criteria include clamping voltage margin relative to system rail, bidirectional surge handling capability, JEDEC-qualified reliability for harsh environments, and DO-219AA footprint compatibility with space-constrained PCB layouts.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its silicon avalanche structure delivers sub-5ns response time from 0V to VBR min, ensuring suppression before downstream IC damage occurs during fast transients like ISO 7637-2 pulse 1/2a/5a or IEC 61000-4-4 EFT bursts.
The device is rated for continuous operation from –55°C to +175°C junction temperature, with thermal resistance RθJA = 96°C/W on standard FR-4 board, supporting placement near heat-generating components. Its 1.0W DC power dissipation and 40A peak forward surge rating (8.3ms half-sine) allow integration into 12V/24V automotive power rails without derating concerns under typical load dump conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 170V - Maximum continuous reverse voltage before leakage exceeds 1.4μA; sets upper limit for protected line operating voltage. |
| VBR (min/max) | 189V / 209V @ 1mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (max) | 275V @ 1.4A - Clamped voltage seen by downstream circuitry during 10/1000µs surge; defines worst-case stress on protected ICs. |
| PPK | 400W (10/1000µs) - Peak transient energy absorption capacity; sufficient for ISO 16750-2 load dump simulation. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Full-system ESD immunity without external shielding or filtering. |
| Operating Temp | –55°C to +175°C - Qualified for under-hood automotive and industrial control cabinet deployment. |
| Package | DO-219AA - Surface-mount, low-profile (0.81–1.20mm height), RoHS-compliant, halogen-free molding compound. |
Pinout & Package
DO-219AA is a two-terminal surface-mount package with no polarity marking for bi-directional devices; both terminals are electrically symmetrical. The cathode band is absent-confirming bi-directional configuration per Diodes' marking convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal conducts avalanche current during positive or negative overvoltage; no orientation required during placement. |
| Case / Mold Compound | Thermal interface | Provides mechanical stability and contributes to RθJA = 96°C/W; requires adequate copper pour for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity dependency. |
| Sub-5ns response time | Ensures suppression activation before 100ps-risetime ESD events propagate beyond the TVS location. |
| AEC-Q200 qualified | Meets stress test requirements for passive components in automotive applications including temperature cycling and humidity bias. |
| Green molding compound | UL 94V-0 flammability rating and <900ppm Br/Cl content meet automotive OEM environmental compliance mandates. |
| 3000-piece tape-and-reel | Supports automated SMT assembly with standard 12mm tape width and 7-inch reel format. |
Applications
| Automotive Battery Protection | Industrial Power Input Stage |
|---|---|
Use Scenario: Protection of 12V/24V battery feed lines against load dump surges (ISO 16750-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt >100V spikes before reaching PMIC or MCU power rails. Use Value: 275V clamping at 1.4A limits downstream voltage stress to safe levels for 36V-rated input regulators and CAN transceivers. |
Use Scenario: Surge protection on AC/DC converter DC output rails exposed to lightning-induced surges (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Secondary-level transient suppressor downstream of bulk filter capacitors, absorbing residual energy after MOV-based primary protection. Use Value: 400W peak power rating enables reliable handling of 2kV/1kA combination wave surges without degradation over 1000+ events. |
| USB Type-C Port ESD Protection | RS-485 Transceiver Interface |
Use Scenario: Board-level ESD safeguard for USB-C CC and VCONN lines subject to repeated human-contact discharge. IC Role / Device Role / Timing Role: Bi-directional TVS placed adjacent to connector to clamp ±30kV contact discharges before reaching USB PD controller or level shifters. Use Value: Symmetric clamping prevents forward conduction during negative CC line transients, preserving USB PD negotiation integrity. |
Use Scenario: Protection of RS-485 differential bus lines (A/B) in factory automation networks exposed to ground potential differences and EFT noise. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to local ground, suppressing common-mode surges while preserving differential signaling integrity. Use Value: Low 1.4μA IR at 170V VRWM minimizes standby current draw and avoids false triggering on 250mV common-mode offset thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CA | DO-214AC package; higher RθJA (125°C/W); 288V VC @ 1.3A; same VRWM/VBR range. | Larger footprint (4.5×2.7mm vs. 2.9×1.9mm); less suitable for ultra-dense automotive modules. | Select when legacy layout reuse or higher surge margin (400W same) outweighs size constraints. |
| TPSMD170C | DO-214AB package; 275V VC @ 1.4A; 1.0μA IR at VRWM; AEC-Q200 qualified. | Same clamping but slightly lower leakage; identical DO-219AA footprint not available-requires pad redesign. | Choose if lower leakage is critical for high-impedance sensor bias networks upstream of protection. |
Compared with SMAJ170CA and TPSMD170C, SMF4L170CA-7 offers the smallest footprint (DO-219AA), lowest profile (<1.2mm height), and best thermal performance (RθJA = 96°C/W) for space- and thermally constrained automotive and industrial designs requiring bi-directional 170V clamping.
Availability
SMF4L170CA-7 is available at Aetrix Electronics and suitable for automotive battery management, industrial power input stages, USB-C port hardening, and RS-485 interface protection requiring stable component supply across extended temperature ranges and high-reliability qualification.
Supply support for SMF4L170CA-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-power TVS portfolio targeting automotive and industrial transient suppression; it was engineered specifically to meet AEC-Q200 requirements while minimizing PCB area in next-generation ECUs and power converters.
FAQ
What is the polarity configuration of SMF4L170CA-7?
SMF4L170CA-7 is a bi-directional TVS diode, confirmed by the absence of a cathode band marking on the DO-219AA package. Its symmetrical construction allows it to clamp overvoltage transients of either polarity equally, making it suitable for AC-coupled lines, differential buses, or ungrounded power domains where polarity cannot be guaranteed.
Does SMF4L170CA-7 meet automotive qualification standards?
Yes-SMF4L170CA-7 is qualified to AEC-Q200 for passive components and manufactured in IATF 16949-certified facilities. It passes temperature cycling, humidity bias, mechanical shock, and solderability tests required for under-hood and chassis-mounted automotive applications, including engine control units and body electronics modules.
How does the clamping voltage of SMF4L170CA-7 compare to its breakdown voltage?
At 1.4A peak pulse current (10/1000µs), SMF4L170CA-7 clamps to a maximum of 275V, while its breakdown voltage starts at 189V (min) and reaches up to 209V (max) at 1mA. This 66–86V overvoltage margin ensures robust protection headroom above normal operating voltage while limiting stress on downstream 300V-rated components.
Can SMF4L170CA-7 replace older SMAJ-series TVS diodes in existing designs?
It can replace SMAJ170CA functionally (same VRWM, VBR, and PPK), but requires PCB footprint revision due to DO-219AA's smaller size (2.9×1.9mm vs. SMAJ's 4.5×2.7mm) and different pad layout. Thermal performance improves (RθJA 96°C/W vs. 125°C/W), allowing higher sustained surge duty cycles without derating.
SMF4L170CA-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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 1.4A
- 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
SMF4L170CA-7 FAQ
1.How can I place an order for SMF4L170CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L170CA-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 SMF4L170CA-7 reliable?
The price and inventory of SMF4L170CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L170CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L170CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L170CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L170CA-7?
SMF4L170CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L170CA-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 SMF4L170CA-7?
For technical support, including SMF4L170CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L170CA-7 requirements.
6.How does Aetrix verify that SMF4L170CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L170CA-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 SMF4L170CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L170CA-7?
All SMF4L170CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L170CA-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 SMF4L170CA-7 part is unused and in its original packaging.
Return procedure for SMF4L170CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L170CA-7 Tags
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Diodes Incorporated
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