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Diodes Incorporated SMF4L170AQ-7
- Part No.:
- SMF4L170AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L170AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,807
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Product details
Overview
SMF4L170AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection in power rails 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 surge current, and AEC-Q101 qualification for under-hood and battery-contact applications.
For engineers reviewing the SMF4L170AQ-7 datasheet, SMF4L170AQ-7 pinout, SMF4L170AQ-7 application, or SMF4L170AQ-7 equivalent, key selection criteria include clamping performance at 1.4A IPP, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and IEC 61000-4-2 ±30kV ESD compliance.
Technical Context
This TVS operates as a fast-acting shunt device that transitions from high-impedance standby to low-impedance conduction when transient voltage exceeds VBR (189–209V). Its sub-1ns response time ensures suppression before downstream ICs experience overstress, and its unidirectional configuration enables integration on positive DC supply lines without reverse-bias leakage concerns.
The device delivers 400W peak pulse power (10/1000µs waveform) with a clamping ratio (VC/VBR) of ~1.45, indicating tight voltage control during surge events. Thermal design leverages the DO-219AA package's 70°C/W junction-to-solder-point resistance (RθJS) and 96°C/W junction-to-ambient rating on standard FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 170V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's nominal DC rail. |
| VBR (min/max) | 189V / 209V - Breakdown occurs within this range at 1mA test current; defines minimum surge threshold for reliable activation. |
| VC @ IRSM | 275V @ 1.4A - Clamping voltage measured at peak surge current; determines worst-case voltage seen by downstream components. |
| IPP (max) | 1.4A - Peak pulse current capability under 10/1000µs waveform; defines maximum transient energy it can safely divert. |
| ESD Rating | ±30kV contact & air per IEC 61000-4-2 - Confirms robustness against human-body-model electrostatic discharges in assembly and field use. |
| Package | DO-219AA - Surface-mount, low-profile (0.81–1.20mm height), RoHS-compliant, halogen-free plastic package with matte tin terminals. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control units, body electronics, and battery management systems. |
Pinout & Package
SMF4L170AQ-7 uses the DO-219AA surface-mount package: a 2-terminal, cathode-band-marked unidirectional TVS diode with anode and cathode leads formed from copper alloy and finished with matte tin. The cathode band identifies the terminal connected to the P-side of the PN junction - critical for correct orientation on positive-rail protection circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction loop during transient clamp event. |
| Cathode (marked) | High-side connection point | Connected to protected line (e.g., 12V/24V rail); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a transients in 12V/24V automotive systems without derating. |
| Sub-1ns response time | Ensures clamping initiates before transient peaks, limiting voltage overshoot on sensitive microcontrollers and CAN transceivers. |
| AEC-Q101 qualified & PPAP capable | Meets automotive change-control requirements and supports production release documentation for Tier 1 suppliers. |
| Halogen- and antimony-free "Green" construction | Complies with EU Directive 2015/863/EU (RoHS 3) and supports end-of-life recycling in automotive OEM programs. |
| DO-219AA footprint compatibility | Shares land pattern with industry-standard SMA/SMB packages while offering 30% lower profile and improved thermal performance. |
Applications
| Automotive Power Rail Protection | Battery Contact ESD Suppression |
|---|---|
Use Scenario: Protecting 12V/24V supply inputs in engine control modules (ECMs) and infotainment head units from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VCC and GND, activated only during overvoltage events exceeding 189V. Use Value: Limits clamped voltage to ≤275V, preventing damage to 36V-rated LDOs and MCU power domains per ISO 16750-2. |
Use Scenario: Guarding exposed battery connector pins against human-body-model (HBM) and contact-discharge ESD events during service or replacement. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector interface, absorbing ±30kV ESD pulses per IEC 61000-4-2. Use Value: Prevents latch-up or gate oxide rupture in adjacent PMICs and fuel-pump drivers by clamping within 1ns. |
| Industrial DC Power Input Protection | Telematics Module Surge Protection |
Use Scenario: Securing 24V auxiliary power inputs in programmable logic controllers (PLCs) and motor drives against induced surges from relay switching or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input stage, coordinated with upstream fuse and downstream filtering. Use Value: Handles 1.4A peak surge current with <100ns delay, maintaining system uptime during factory floor electrical disturbances. |
Use Scenario: Safeguarding LTE/GNSS antenna power feeds and CAN/FlexRay bus lines in vehicle telematics control units (TCUs) against coupled transients. IC Role / Device Role / Timing Role: Point-of-entry TVS on 5V/12V bias rails feeding RF front-end ICs and communication PHYs. Use Value: Maintains signal integrity by limiting clamping overshoot to <275V, avoiding desense or reset of cellular modems during roadside ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A | Same VRWM (170V) and VC (275V), but lower peak power (400W vs. SMAJ series' 400W), DO-214AC package (larger footprint, higher RθJA = 110°C/W). | Less suitable for space-constrained automotive modules due to 3.5mm × 4.5mm footprint vs. DO-219AA's 2.7mm × 1.9mm. | Prefer SMF4L170AQ-7 where board area and thermal performance are critical; choose SMAJ170A only if legacy layout reuse is required. |
| 1.5SMC170A | Higher VRWM tolerance (170V), same VC (275V), but larger DO-214AB package, 1.5kW peak power rating, and non-AEC-Q101 qualification. | Not approved for automotive production; limited to industrial/commercial designs lacking functional safety or qualification mandates. | Select SMF4L170AQ-7 for AEC-Q101-compliant automotive programs; use 1.5SMC170A only in cost-sensitive, non-automotive applications requiring higher surge margin. |
Compared with SMAJ170A and 1.5SMC170A, SMF4L170AQ-7 offers superior board-space efficiency, lower thermal resistance, and formal automotive qualification - making it the preferred choice for new automotive ECUs, battery management interfaces, and telematics hardware where reliability and footprint are co-constrained.
Availability
SMF4L170AQ-7 is available at Aetrix Electronics and suitable for automotive power rail protection, battery contact ESD suppression, and industrial DC input protection requiring stable component supply across multi-year production cycles.
Supply support for SMF4L170AQ-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, industrial, and computing markets.
The SMF4LxxAQ series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for compact, thermally efficient overvoltage protection in next-generation automotive electronics with stringent space and qualification requirements.
FAQ
What is the polarity configuration of SMF4L170AQ-7?
SMF4L170AQ-7 is a unidirectional TVS diode, identified by a cathode band marking on the DO-219AA package. It conducts only when the cathode is at a higher potential than the anode - making it suitable for protecting positive DC supply rails against positive-going transients while blocking reverse leakage under normal operation.
Does SMF4L170AQ-7 meet automotive qualification standards?
Yes, SMF4L170AQ-7 is AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. It is explicitly rated for automotive applications including engine control, body electronics, and battery interface systems, with full traceability and change-control documentation available upon request.
How does the DO-219AA package improve thermal performance over SMA/SMB alternatives?
The DO-219AA package achieves RθJA = 96°C/W on standard FR-4 PCBs - 14°C/W better than DO-214AC (SMA) - due to optimized copper leadframe geometry and reduced die-to-pad thermal path length. This allows sustained operation at higher ambient temperatures and improves reliability in under-hood environments up to +125°C.
What is the maximum clamping voltage at rated surge current?
At its maximum rated peak pulse current of 1.4A (10/1000µs waveform), SMF4L170AQ-7 clamps to a maximum of 275V. This value is guaranteed across temperature and process variation, ensuring downstream components see no more than 275V during standardized surge events defined in ISO 7637-2 and IEC 61000-4-5.
SMF4L170AQ-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L170AQ-7 FAQ
1.How can I place an order for SMF4L170AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L170AQ-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 SMF4L170AQ-7 reliable?
The price and inventory of SMF4L170AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L170AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L170AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L170AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L170AQ-7?
SMF4L170AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L170AQ-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 SMF4L170AQ-7?
For technical support, including SMF4L170AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L170AQ-7 requirements.
6.How does Aetrix verify that SMF4L170AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L170AQ-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 SMF4L170AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L170AQ-7?
All SMF4L170AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L170AQ-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 SMF4L170AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L170AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L170AQ-7 Tags
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