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Diodes Incorporated SMF4L170A-7
- Part No.:
- SMF4L170A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L170A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
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Product details
Overview
SMF4L170A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 170V working peak reverse voltage (VRWM), 189–209V breakdown voltage (VBR), and 275V maximum clamping voltage (VC) at 1.4A surge current. It delivers IEC61000-4-2 ±30kV ESD protection and features sub-1ns response time for fast overvoltage suppression in power rail and interface line protection.
For engineers reviewing the SMF4L170A-7 datasheet, SMF4L170A-7 pinout, SMF4L170A-7 application, or SMF4L170A-7 equivalent, this part is selected for high-voltage DC bus protection where low leakage (<1.4µA at VRWM), tight clamping margin, and DO-219AA footprint compatibility are critical - especially in automotive body electronics and industrial power supplies.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 189V minimum breakdown threshold. Its silicon junction design ensures stable VBR tolerance (±5.5%) and low thermal resistance (RθJA = 96°C/W) under transient stress.
The device uses a planar passivated junction in a molded DO-219AA package with matte tin terminals, enabling reliable soldering and compliance with JEDEC high-reliability standards. Its 1.4µA max reverse leakage at 170V supports low-power standby circuits without compromising protection integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); sustains single high-energy surges without degradation |
| Working Peak Reverse Voltage (VRWM) | 170V; maximum continuous DC or RMS reverse voltage before clamping initiates |
| Breakdown Voltage (VBR) | 189–209V @ 1mA; defines precise turn-on threshold for overvoltage events |
| Maximum Clamping Voltage (VC) | 275V @ 1.4A; limits downstream voltage during surge to protect 300V-rated components |
| Reverse Leakage Current (IR) | ≤1.4µA @ 170V; negligible standby power loss in battery-backed or energy-sensitive systems |
| ESD Withstand | ±30kV air / ±30kV contact per IEC61000-4-2; meets automotive interior and connector-level ESD requirements |
| Response Time | <1.0ns (unidirectional); ensures clamping activation before transient energy couples into IC inputs |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount outline (2.80 × 1.90 × 0.60 mm), halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode (marked band) | Reverse-biased clamping terminal | Connected to protected line (e.g., 170V DC bus); conducts avalanche current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12V/24V automotive systems |
| DO-219AA footprint | Reduces PCB area by ~40% vs. SMA/SMB packages while maintaining thermal performance on 2 oz. copper pads |
| 1.4µA max IR at VRWM | Minimizes quiescent current drain in always-on monitoring circuits and battery-powered sensors |
| Sub-1ns response | Clamps ESD events before propagation across PCB traces or into sensitive analog front-ends |
| AEC-Q101 qualified variant available | Q-suffix versions support PPAP and IATF 16949 production for automotive power modules and lighting control units |
Applications
| Automotive Body Control Module (BCM) | Industrial DC Power Distribution Unit |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O from load dump and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, clamping transients above 170V while remaining inert during normal 12V operation. Use Value: Prevents latch-up or permanent damage to 3.3V/5V logic interfaces without adding series impedance or signal distortion. |
Use Scenario: Shields 170V DC output rails of telecom rectifiers and PoE++ injectors from lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side DC bus, coordinated with upstream MOVs for staged surge handling. Use Value: Limits transient overshoot to ≤275V, ensuring safe operation of 300V-rated electrolytic capacitors and SiC MOSFET gate drivers. |
| EV Battery Management System (BMS) Cell Monitor | Smart Grid Metering Terminal |
Use Scenario: Guards isolated CAN FD communication lines connecting cell voltage monitors to master controller against ground bounce and coupling noise. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to local ground, suppressing common-mode transients induced by high-di/dt cell switching. Use Value: Maintains signal integrity during 1 Mbps CAN FD operation while surviving repeated ±30kV ESD events at connector interfaces. |
Use Scenario: Secures RS-485 data lines in utility meters exposed to induced surges from nearby MV/LV switching events. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential pair, activated only during >170V common-mode excursions to avoid false triggering. Use Value: Enables IEC 61000-4-5 Level 3 (2kV) surge immunity without degrading signal rise/fall times or adding jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A | Same VRWM/VBR/VC specs but in larger SMA package (4.5×2.7mm); RθJA = 110°C/W | Less suitable for space-constrained automotive modules; higher thermal resistance reduces surge repetition capability | Select if legacy board layout lacks DO-219AA pad stack or requires manual rework compatibility |
| SMCJ170A | Higher 1500W rating, same VRWM, but DO-214AB package (7.1×6.2mm); 10× PCB area | Over-specified for 400W needs; used where multi-pulse endurance or MIL-STD-1275E compliance is mandatory | Choose only when system-level testing confirms need for >1000W pulse handling or legacy SMC footprint reuse |
Compared with SMAJ170A and SMCJ170A, SMF4L170A-7 delivers identical clamping performance in 40% less PCB area and 14% lower thermal resistance - making it optimal for next-gen compact automotive and industrial power designs where size and thermal efficiency are prioritized.
Availability
SMF4L170A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC power distribution, EV battery management systems, and smart grid metering terminals requiring stable component supply and AEC-Q101 traceability.
Supply support for SMF4L170A-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.
This part belongs to Diodes' SMF4L series of ultra-compact TVS diodes - engineered specifically for high-voltage DC rail protection where minimal footprint, low leakage, and fast response are non-negotiable in safety-critical systems.
FAQ
Is SMF4L170A-7 unidirectional or bidirectional?
SMF4L170A-7 is unidirectional, indicated by the absence of "C" in its part number and confirmed by its cathode band marking. It clamps only during reverse overvoltage events and conducts forward current like a standard diode - making it ideal for DC rail protection where polarity is fixed.
What is the maximum operating temperature for continuous use?
The device supports continuous operation from –55°C to +175°C junction temperature. At +125°C ambient, derated peak pulse power drops to ~240W (per Figure 1 derating curve), while DC power dissipation remains limited to 1.0W regardless of temperature.
Does SMF4L170A-7 meet automotive qualification standards?
The base SMF4L170A-7 is not AEC-Q101 qualified, but Diodes offers Q-suffix variants (e.g., SMF4L170AQ-7) manufactured in IATF 16949-certified facilities and tested to AEC-Q101 stress requirements - required for production automotive applications.
How does its clamping voltage compare to competing 170V TVS diodes?
At 1.4A test current, SMF4L170A-7 clamps at 275V - 5–8V tighter than SMAJ170A (280V) and SMCJ170A (283V). This 2–3% improvement directly extends the safe operating margin for 300V-rated downstream components in high-reliability power systems.
SMF4L170A-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L170A-7 FAQ
1.How can I place an order for SMF4L170A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L170A-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 SMF4L170A-7 reliable?
The price and inventory of SMF4L170A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L170A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L170A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L170A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L170A-7?
SMF4L170A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L170A-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 SMF4L170A-7?
For technical support, including SMF4L170A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L170A-7 requirements.
6.How does Aetrix verify that SMF4L170A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L170A-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 SMF4L170A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L170A-7?
All SMF4L170A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L170A-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 SMF4L170A-7 part is unused and in its original packaging.
Return procedure for SMF4L170A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L170A-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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