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STMicroelectronics SMB6F170A
- Part No.:
- SMB6F170A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F170A.pdf
- Description:
- TVS DIODE 170VWM 275VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
SMB6F170A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for high-reliability surge protection in power rails and signal lines. It features a standoff voltage (VRM) of 170 V, clamping voltage (VCL) of 275 V at 2.2 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for industrial power supplies and automotive body electronics.
For engineers reviewing the SMB6F170A datasheet, SMB6F170A pinout, SMB6F170A application, or SMB6F170A equivalent, key selection criteria include its 170 V standoff, low leakage (0.2 µA @ 25 °C), flat SMB package (1 mm height), IEC 61000-4-2 ±30 kV ESD robustness, and high-temperature stability for under-hood or enclosed power systems.
Technical Context
The SMB6F170A uses planar junction technology to achieve low leakage current and stable breakdown behavior across temperature. Its unidirectional configuration enables DC rail protection without reverse conduction during normal operation.
It delivers 600 W peak pulse power (10/1000 µs) at 25 °C and retains 470 W at Tj = 175 °C, with dynamic resistance (RD) of 12.7 Ω-enabling predictable clamping performance under fast transients like ISO 7637-2 load dump or IEC 61000-4-4 EFT bursts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 170 V - maximum continuous reverse operating voltage before clamping begins |
| Clamping Voltage (VCL) | 275 V at 2.2 A (10/1000 µs) - limits transient voltage seen by downstream circuitry |
| Peak Pulse Power | 600 W (10/1000 µs) - sustains short-duration surges without failure |
| Leakage Current | 0.2 µA @ 25 °C - minimizes standby power loss in high-impedance circuits |
| Junction Temperature | −55 to +175 °C - supports operation in harsh environments including automotive under-hood |
| ESD Robustness | ±30 kV contact/air discharge (IEC 61000-4-2) - exceeds Level 4 immunity requirements |
| Package | SMB Flat (JEDEC DO-214AA) - 1 mm profile enables space-constrained PCB layouts |
Pinout & Package
SMB6F170A is housed in an SMB Flat (DO-214AA) surface-mount package with two terminals: cathode (marked band) and anode. The 1 mm profile and IPC7531-compliant footprint support automated assembly and thermal reliability on FR4 boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when VREV > VRM |
| Anode | Reference node | Tied to system ground or lower-potential rail; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Planar junction construction | Enables stable VBR and low leakage across −55 °C to +175 °C for long-term reliability |
| Matte tin lead finish | Meets J-STD-002, JESD 22-B102 E3, and MIL-STD-750 solderability standards for consistent reflow yield |
| UL94 V0 flammability rating | Ensures compliance with safety-critical enclosure and insulation requirements in industrial equipment |
| IEC 61000-4-4 Level 4 compliance | Withstands 4 kV electrical fast transients on power and signal lines without degradation |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients above 170 V. Use Value: Limits clamped voltage to 275 V, preventing damage to upstream rectifiers and downstream DC-DC converters rated for ≤300 V input. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from battery voltage surges and ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN line (VCC and data line) to suppress ±30 kV ESD per IEC 61000-4-2. Use Value: Low 0.2 µA leakage avoids signal distortion on 10–20 kΩ LIN termination networks while maintaining full bus functionality. |
| Telecom AC-DC Adapter Input | Renewable Energy Inverter DC Link |
Use Scenario: Secondary-side surge protection on 170 V-rated output rails of isolated AC-DC adapters used in PoE-powered infrastructure. IC Role / Device Role / Timing Role: Unidirectional clamping device placed across output capacitor to absorb coupling-induced transients from primary side. Use Value: 275 V clamping ensures downstream 200 V-rated electrolytic capacitors remain within safe operating voltage margin during surge events. | Use Scenario: Overvoltage protection on DC link capacitors in solar microinverters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: High-energy TVS connected between DC+ and DC− rails to shunt fast transients before they reach IGBT gate drivers. Use Value: 470 W power handling at 175 °C allows sustained operation in sealed enclosures where ambient temperatures exceed 85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A (Bourns) | Same VRM (170 V), higher VCL (277 V), 600 W rating, but 1.5 mm height vs. 1 mm | Less suitable for ultra-low-profile designs; identical ESD/IEC 61000-4-2 performance | Select if board stack height permits and Bourns sourcing is preferred |
| P6SMB170A (Littelfuse) | Identical VRM and VCL specs, same SMB package, but rated for 100 °C max Tj (vs. 175 °C) | Not recommended for under-hood or high-ambient industrial use requiring extended thermal margin | Choose only for ambient < 85 °C applications with cost-sensitive procurement |
Compared with SMBJ170A and P6SMB170A, SMB6F170A uniquely combines 175 °C junction rating, 1 mm profile, and 12.7 Ω dynamic resistance-making it optimal for thermally constrained, high-reliability DC rail protection where long-term stability matters.
Availability
SMB6F170A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom adapters, and renewable energy inverters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMB6F170A 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for demanding surge environments where low leakage, high-temperature operation, and planar junction stability are critical design requirements.
FAQ
What is the maximum clamping voltage of SMB6F170A under a 10/1000 µs surge?
The SMB6F170A clamps to 275 V when subjected to a 2.2 A 10/1000 µs surge current, as specified in Table 2 of DS12898 Rev 2. This value is measured at 25 °C and increases predictably with junction temperature using the αT coefficient of 10.8 × 10−4/°C.
Can SMB6F170A be used in bidirectional configurations?
No-SMB6F170A is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. For AC or bipolar signal line protection, ST offers the SMB6F170CA variant (not SMB6F170A); substituting this part would result in improper clamping behavior and potential failure.
Does SMB6F170A meet automotive qualification standards?
While not AEC-Q200 qualified, SMB6F170A meets key automotive-relevant stress tests: IEC 61000-4-2 ±30 kV ESD, IEC 61000-4-4 Level 4 EFT, and operates reliably up to 175 °C junction temperature-making it widely deployed in non-safety-critical automotive modules such as body control units and infotainment power rails.
What is the recommended PCB footprint for SMB6F170A?
The manufacturer specifies an IPC7531-compliant footprint with 5.84 mm pad length, 1.20 mm pad width, and 2.07 mm center-to-center spacing (Figure 13, DS12898 Rev 2). Copper area under each lead should be ≥1 cm² to maintain Rth(j-a) ≤ 150 °C/W and sustain 470 W power dissipation at 175 °C.
SMB6F170A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 190V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
SMB6F170A FAQ
1.How can I place an order for SMB6F170A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F170A 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 SMB6F170A reliable?
The price and inventory of SMB6F170A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F170A is usually 5 days.
3.What payment methods are accepted for SMB6F170A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F170A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F170A?
SMB6F170A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F170A 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 SMB6F170A?
For technical support, including SMB6F170A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F170A requirements.
6.How does Aetrix verify that SMB6F170A is sourced from the original manufacturer or authorized distributors?
All SMB6F170A 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 SMB6F170A meets industry standards.
7.What is the process for return or replacement of SMB6F170A?
All SMB6F170A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F170A, 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 SMB6F170A part is unused and in its original packaging.
Return procedure for SMB6F170A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F170A Tags
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