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Vishay General Semiconductor - Diodes Division SMA6F8.5A-M3/6A
- Part No.:
- SMA6F8.5A-M3/6A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F8.5A-M3/6A.pdf
- Description:
- TVS DIODE 8.5VWM 18.7VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:483
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Product details
Overview
SMA6F8.5A-M3/6A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SlimSMA (DO-221AC) package, designed for clamping voltage transients on signal and power lines. It features a 8.5 V stand-off voltage (VWM), 9.4–10.4 V breakdown voltage (VBR) at 1 mA, 13.3 V maximum clamping voltage (VC) at 45.1 A (10/1000 μs), 600 W peak pulse power rating, and IEC 61000-4-2 Level 4 ESD protection (15 kV air / 8 kV contact). It is used to protect MOSFET gates, sensor signal lines, and microcontroller I/O in industrial and telecom equipment.
For engineers reviewing the SMA6F8.5A-M3/6A datasheet, SMA6F8.5A-M3/6A pinout, SMA6F8.5A-M3/6A application, or SMA6F8.5A-M3/6A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current at operating bias, thermal derating on FR4 PCB, and compatibility with automated SMT placement due to its 0.95 mm profile and M3 halogen-free RoHS-compliant finish.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias below 8.5 V, it draws ≤20 μA reverse leakage; when a transient exceeds its breakdown threshold, it avalanches to clamp the line at ≤13.3 V (10/1000 μs) or ≤18.7 V (8/20 μs), diverting up to 45.1 A or 205 A respectively. Its unidirectional polarity-cathode marked by a band-requires correct orientation across DC-biased lines.
Thermally, it supports junction temperatures from –55 °C to +175 °C, with 120–150 °C/W junction-to-ambient thermal resistance on standard FR4 (2 oz. copper), and derates linearly above 25 °C ambient. Its slim 0.95 mm height and DO-221AC footprint enable high-density layout in space-constrained consumer and embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage begins; must exceed system DC rail or signal swing. |
| VBR (min/max) | 9.4 V / 10.4 V at 1 mA - Breakdown onset range; defines minimum overvoltage threshold for clamping activation. |
| VC @ IPPM (10/1000 μs) | 13.3 V at 45.1 A - Clamped voltage during 10/1000 μs surge; determines worst-case stress on downstream IC. |
| PPPM (10/1000 μs) | 600 W - Peak transient energy handling capability; validates robustness against common inductive switching events. |
| ID @ VWM | ≤20 μA - Reverse leakage at rated stand-off; ensures minimal quiescent power loss and signal integrity in high-impedance nodes. |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Confirmed immunity to human-body-model ESD events in end-user environments. |
| Package | SlimSMA (DO-221AC) - 0.95 mm height, 3.12 mm × 4.35 mm outline; optimized for high-speed pick-and-place and reflow compatibility. |
Pinout & Package
SlimSMA (DO-221AC) package: surface-mount, unidirectional, cathode indicated by molded band. Dimensions: 3.12 mm length × 4.35 mm width × 0.95 mm height. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes conduction path during transient clamping. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., USB VBUS, sensor supply); avalanche initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 13.3 V max VC at 45.1 A (10/1000 μs) ensures safe margin below 16 V logic IC absolute maximum ratings. |
| Low-profile mounting | 0.95 mm typical height enables use in ultra-thin consumer enclosures and stacked PCB assemblies without mechanical interference. |
| Automated assembly support | M3 suffix confirms halogen-free, RoHS-compliant, industrial-grade construction with J-STD-002 solderability and JESD201 Class 2 whisker resistance. |
| Transient energy handling | 4 kW PPPM (8/20 μs) supports protection against lightning-induced surges per IEC 61000-4-5 (indirect) in telecom interfaces. |
| ESD hardening | IEC 61000-4-2 Level 4 rating eliminates need for additional discrete ESD diodes on exposed ports like HDMI or RS-485. |
Applications
| Industrial Sensor Interface | USB Power Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLC modules exposed to relay coil flyback and motor drive noise. IC Role / Device Role: Unidirectional shunt TVS placed between sensor VOUT and GND, clamping transients before they reach ADC input or op-amp buffer. Use Value: 13.3 V clamping ensures sensor output stays within ±15 V absolute max of downstream instrumentation amplifier, preventing latch-up or damage. |
Use Scenario: Safeguarding 5 V VBUS line in USB 2.0 host ports against hot-plug insertion spikes and ESD events during field deployment. IC Role / Device Role: Standoff-rated TVS mounted directly at USB connector, conducting surge current away from USB controller's internal ESD structures. Use Value: 8.5 V VWM allows full 5 V operation while blocking false triggering; 15 kV air discharge rating meets USB-IF compliance requirements. |
| Telecom Line Card Surge Protection | MOSFET Gate Drive Protection |
|
Use Scenario: Secondary-level transient suppression on 48 V DC distribution rails in VoIP gateway line cards subjected to induced surges from nearby AC wiring. IC Role / Device Role: Unidirectional TVS connected from rail to chassis ground, absorbing residual energy after primary MOV/GDT stages. Use Value: 600 W (10/1000 μs) rating handles sustained inductive kickback; DO-221AC footprint fits tight spacing between telecom connectors and power converters. |
Use Scenario: Preventing gate oxide rupture in N-channel power MOSFETs driven by microcontrollers in motor control H-bridges during shoot-through or load dump. IC Role / Device Role: TVS placed between gate and source terminals, clamping Miller-induced voltage spikes during fast switching transitions. Use Value: Low dynamic resistance (0.064 Ω) minimizes clamping voltage overshoot, keeping gate stress below 20 V even during 100 ns dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F8.0A-M3/6A | VWM = 8.0 V, VBR = 8.89–9.83 V, VC = 12.8 V @ 46.9 A - lower stand-off and clamping voltages. | Better suited for 3.3 V or 5 V logic rails where tighter clamping margin is required. | Select when protecting 5 V systems with <12 V absolute max ICs; verify VWM margin against worst-case ripple. |
| SMA6F9.0A-M3/6A | VWM = 9.0 V, VBR = 10.0–11.1 V, VC = 14.3 V @ 42.0 A - higher stand-off and clamping voltages. | Preferred for 12 V automotive or industrial supplies where higher nominal voltage tolerance is needed. | Choose for 12 V systems with >15 V IC withstand ratings; provides larger VWM headroom but slightly reduced clamping precision. |
Compared with SMA6F8.5A-M3/6A, SMA6F8.0A-M3/6A offers tighter clamping for low-voltage logic but risks false triggering on noisy 5 V rails, while SMA6F9.0A-M3/6A improves noise immunity on 12 V lines at the cost of higher clamped stress-selection depends on protected circuit's voltage tolerance and noise floor.
Availability
SMA6F8.5A-M3/6A is available at Aetrix Electronics and suitable for industrial sensor interface, USB power line protection, and telecom line card surge suppression requiring stable component supply, consistent M3 halogen-free compliance, and verified SlimSMA (DO-221AC) packaging.
Supply support for SMA6F8.5A-M3/6A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and industrial-grade qualification.
The SMA6F series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in space-constrained, high-reliability applications across industrial, telecom, and computing markets.
FAQ
What is the maximum clamping voltage of the SMA6F8.5A-M3/6A under a 10/1000 μs surge?
The SMA6F8.5A-M3/6A has a maximum clamping voltage (VC) of 13.3 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 45.1 A. This value is measured per the conditions specified in the Vishay datasheet Document Number 89458 and reflects worst-case transient suppression performance at 25 °C ambient temperature. The SMA6F8.5A-M3/6A maintains this clamping level across its operational junction temperature range, with minor variation governed by its voltage temperature coefficient of 7.3 × 10⁻⁴ /°C.
Does the SMA6F8.5A-M3/6A support automated SMT assembly?
Yes, the SMA6F8.5A-M3/6A is fully compatible with automated surface-mount assembly. Its SlimSMA (DO-221AC) package features a low 0.95 mm profile, matte tin-plated leads qualified to J-STD-002 solderability standards, and M3 suffix certification for halogen-free, RoHS-compliant, industrial-grade manufacturing. The device meets JESD201 Class 2 whisker resistance and is supplied in 7" tape-and-reel format (3500 units per reel), enabling reliable high-speed pick-and-place and lead-free reflow processing.
How does the SMA6F8.5A-M3/6A differ from bidirectional TVS diodes?
The SMA6F8.5A-M3/6A is unidirectional, meaning it conducts only during positive transients relative to its cathode-anode orientation-and behaves like a Zener diode in reverse bias. Unlike bidirectional TVS devices, it does not suppress negative-going transients on AC-coupled lines unless paired with complementary components. Its polarity is marked by a cathode band, and incorrect orientation will prevent clamping. The SMA6F8.5A-M3/6A is intended for DC-biased applications such as power rails and digital I/O, not symmetrical AC signals.
What is the leakage current specification for SMA6F8.5A-M3/6A at its rated stand-off voltage?
At its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature, the SMA6F8.5A-M3/6A exhibits a maximum reverse leakage current (ID) of 20 μA. This low leakage ensures minimal power loss and signal distortion in high-impedance circuits such as sensor outputs or microcontroller reset lines. Leakage remains within specification up to 85 °C, with gradual increase governed by junction temperature effects described in the Vishay datasheet's thermal characterization section.
Can SMA6F8.5A-M3/6A be used for IEC 61000-4-5 surge protection?
The SMA6F8.5A-M3/6A is rated for 4 kW peak pulse power with an 8/20 μs waveform, making it suitable for secondary-level IEC 61000-4-5 surge protection in conjunction with upstream components like GDTs or MOVs. However, it is not rated for direct 10/700 μs or 1.2/50 μs line-to-line surges typical of primary protection. For full IEC 61000-4-5 compliance, the SMA6F8.5A-M3/6A should be deployed downstream of coordinated protection stages, where its 13.3 V clamping voltage safeguards sensitive ICs after bulk energy has been diverted.
SMA6F8.5A-M3/6A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.4V
- Voltage - Clamping (Max) @ Ipp:
- 18.7V
- Current - Peak Pulse (10/1000µs):
- 205A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- 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:
- DO-221AC (SlimSMA)
SMA6F8.5A-M3/6A FAQ
1.How can I place an order for SMA6F8.5A-M3/6A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F8.5A-M3/6A 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 SMA6F8.5A-M3/6A reliable?
The price and inventory of SMA6F8.5A-M3/6A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F8.5A-M3/6A is usually 5 days.
3.What payment methods are accepted for SMA6F8.5A-M3/6A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F8.5A-M3/6A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F8.5A-M3/6A?
SMA6F8.5A-M3/6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F8.5A-M3/6A 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 SMA6F8.5A-M3/6A?
For technical support, including SMA6F8.5A-M3/6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F8.5A-M3/6A requirements.
6.How does Aetrix verify that SMA6F8.5A-M3/6A is sourced from the original manufacturer or authorized distributors?
All SMA6F8.5A-M3/6A 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 SMA6F8.5A-M3/6A meets industry standards.
7.What is the process for return or replacement of SMA6F8.5A-M3/6A?
All SMA6F8.5A-M3/6A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F8.5A-M3/6A, 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 SMA6F8.5A-M3/6A part is unused and in its original packaging.
Return procedure for SMA6F8.5A-M3/6A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F8.5A-M3/6A Tags
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