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Vishay General Semiconductor - Diodes Division SMA6F8.5A-M3/6B
- Part No.:
- SMA6F8.5A-M3/6B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F8.5A-M3/6B.pdf
- Description:
- TVS DIODE 8.5VWM 18.7VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,022
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Product details
Overview
SMA6F8.5A-M3/6B 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 MOSFETs, ICs, and sensor signal lines in consumer, industrial, and telecom equipment.
For engineers reviewing the SMA6F8.5A-M3/6B datasheet, SMA6F8.5A-M3/6B pinout, SMA6F8.5A-M3/6B application, or SMA6F8.5A-M3/6B equivalent, key selection criteria include its unidirectional polarity, 13.3 V clamping performance at 45.1 A surge, SlimSMA footprint compatibility with automated placement, thermal derating behavior up to 175 °C junction temperature, and compliance with J-STD-020 MSL level 1 reflow profile.
Technical Context
This TVS diode operates as a voltage-clamped overvoltage protector using avalanche breakdown. Its unidirectional configuration provides forward conduction only in one direction, enabling integration into DC-biased lines without reverse leakage concerns beyond 8.5 V. The device exhibits low dynamic resistance (0.064 Ω) and tight VBR tolerance (±5.3% at 25 °C), ensuring predictable clamping onset across production lots.
Thermal design relies on junction-to-ambient thermal resistance of 120–150 °C/W on FR4 PCB (2 oz. copper), with full power derating above 25 °C ambient. Its 0.95 mm profile and matte tin-plated leads support high-density layout and lead-free soldering per J-STD-002, while meeting UL 94 V-0 flammability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage begins; sets safe DC bias margin for protected line. |
| VBR (min/max) | 9.4 V / 10.4 V at 1 mA - Breakdown threshold range defining clamping onset; ensures reliable triggering under transient conditions. |
| VC @ IPPM | 13.3 V at 45.1 A (10/1000 μs) - Clamped voltage during standard surge event; determines maximum stress seen by downstream ICs. |
| PPPM (10/1000 μs) | 600 W - Peak surge energy handling capacity; defines survivability against common inductive switching transients. |
| ID @ VWM | 20 μA max - Reverse leakage current at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in high-ambient industrial environments with appropriate PCB thermal relief. |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Confirmed immunity to human-body-model electrostatic discharge events. |
Pinout & Package
Package: SlimSMA (DO-221AC), surface-mount, unidirectional, cathode indicated by color band. Dimensions: 4.15–4.35 mm length × 2.50–2.70 mm width × 0.95 mm height. RoHS-compliant, halogen-free, M3 suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line's lower-potential side (e.g., GND or return path); conducts surge current toward cathode. |
| Cathode | Current exit terminal during clamping | Connected to protected line's higher-potential side (e.g., VCC or signal rail); clamps voltage relative to anode reference. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SlimSMA package | 0.95 mm typical height enables use in space-constrained portable and IoT devices without compromising surge robustness. |
| Automated placement compatibility | Matte tin-plated leads and standardized DO-221AC footprint ensure high-yield pick-and-place assembly in volume manufacturing. |
| High-energy clamping capability | 600 W (10/1000 μs) and 4 kW (8/20 μs) ratings protect against both slow inductive spikes and fast lightning-induced surges. |
| MSL Level 1 reliability | Rated for peak reflow temperatures up to 260 °C per J-STD-020, eliminating moisture sensitivity concerns in standard SMT processes. |
| ESD-hardened construction | Validated to IEC 61000-4-2 Level 4 ensures immunity to real-world handling and system-level ESD events without external shielding. |
Applications
| Industrial Sensor Interface Protection | USB Power Line Surge Suppression |
|---|---|
|
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 / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients below 13.3 V. Use Value: Prevents ADC saturation and latch-up by limiting surge voltage to 13.3 V at 45.1 A, preserving measurement integrity during 600 W transient events. |
Use Scenario: Safeguarding 5 V VBUS line in USB 2.0 host ports against hot-plug insertion spikes and nearby ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VBUS and GND to absorb 8/20 μs lightning surges up to 4 kW without degradation. Use Value: Maintains USB enumeration stability by clamping VBUS to ≤13.3 V during 15 kV air-gap ESD strikes, meeting USB-IF compliance requirements. |
| Telecom DSL Line Protection | Consumer Audio Amplifier Power Rail Clamp |
|
Use Scenario: Shielding ADSL line drivers from induced surges on twisted-pair telephone lines in residential gateways. IC Role / Device Role / Timing Role: Unidirectional TVS installed on differential line pair to suppress common-mode transients while preserving signal integrity. Use Value: Limits clamping voltage to 13.3 V during 10/1000 μs surges, preventing damage to line driver ICs rated for ≤16 V absolute maximum. |
Use Scenario: Securing 12 V supply rails of Class D audio amplifiers in smart speakers against inductive kickback from speaker coil switching. IC Role / Device Role / Timing Role: TVS mounted directly at amplifier VIN pin to shunt transient energy before it reaches internal LDOs and gate drivers. Use Value: Absorbs 600 W pulses without failure, reducing risk of amplifier shutdown or permanent damage during loudspeaker load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F8.0A-M3/6B | Lower VWM (8.0 V), slightly lower VBR (8.89–9.83 V), identical package and clamping (12.8 V @ 46.9 A). | Better suited for 5 V–8 V logic rails where tighter clamping margin is required; may trigger prematurely on 8.5 V nominal lines. | Select when protecting 8 V systems with stricter clamping headroom; verify no false triggering under normal VWM tolerance. |
| SMA6F9.0A-M3/6B | Higher VWM (9.0 V), higher VBR (10.0–11.1 V), same package, clamping voltage 14.2 V @ 42.3 A. | Preferred for 9 V–12 V power rails where higher standoff prevents nuisance conduction; trades clamping voltage for margin. | Choose for 9 V systems needing reduced leakage and higher transient immunity threshold; accept 14.2 V clamping vs. 13.3 V. |
Compared with SMA6F8.5A-M3/6B, SMA6F8.0A-M3/6B offers lower clamping but risks premature activation on 8.5 V rails, while SMA6F9.0A-M3/6B increases standoff margin at the cost of 0.9 V higher clamping-critical for ICs with narrow absolute maximum voltage windows.
Availability
SMA6F8.5A-M3/6B is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB power line protection, telecom DSL line hardening, and consumer audio amplifier rail clamping requiring stable component supply and long-term lifecycle continuity.
Supply support for SMA6F8.5A-M3/6B 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, precision, and high-volume manufacturability.
The SMA6F series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, low-profile transient suppression in space-constrained, high-reliability applications across industrial, telecom, and consumer markets.
FAQ
What is the maximum clamping voltage of the SMA6F8.5A-M3/6B under a 10/1000 μs surge?
The SMA6F8.5A-M3/6B has a maximum clamping voltage (VC) of 13.3 V at 45.1 A for a 10/1000 μs waveform. This value is measured per standard test conditions and reflects the peak voltage seen across the device during that specific transient event. It is derived from the device's dynamic resistance (0.064 Ω) and breakdown characteristics, and must be used with the corresponding peak current to determine actual system stress on downstream components. The SMA6F8.5A-M3/6B maintains this clamping performance across its specified operating temperature range.
Is the SMA6F8.5A-M3/6B suitable for bidirectional signal line protection?
No, the SMA6F8.5A-M3/6B is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts surge current in one direction-from anode to cathode-when reverse-biased beyond VBR. For bidirectional protection (e.g., RS-485, USB D+/D−), a symmetric device such as a bidirectional TVS like SMA6F8.5CA-M3/6B would be required. Using SMA6F8.5A-M3/6B on AC-coupled or floating lines risks incomplete protection during positive-going transients. The SMA6F8.5A-M3/6B is intended for DC-biased lines with defined polarity.
What is the thermal resistance (RθJA) of the SMA6F8.5A-M3/6B on a standard PCB?
The SMA6F8.5A-M3/6B has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a maximum of 150 °C/W when mounted on an FR4 PCB with 2 oz. copper and the standard footprint per JEDEC 51-2A. This value governs power derating above 25 °C ambient temperature and must be applied when calculating safe continuous power dissipation (PD = 8 W at TM = 55 °C). The SMA6F8.5A-M3/6B's thermal performance supports reliable operation up to 175 °C junction temperature when layout and copper area meet specification.
Does the SMA6F8.5A-M3/6B meet automotive AEC-Q200 requirements?
No, the SMA6F8.5A-M3/6B is not AEC-Q200 qualified. It is specified for industrial, consumer, and telecom applications and carries no automotive qualification. While its operating junction temperature range (–55 °C to +175 °C) overlaps with AEC-Q200 Grade 1 limits, qualification requires additional testing including temperature cycling, humidity bias, and board flex per the full AEC-Q200 standard. For automotive use, engineers should select Vishay's AEC-Q200-qualified TVS families such as the AUTOMOTIVE SMA6F series variants. The SMA6F8.5A-M3/6B remains suitable for non-automotive industrial designs.
How does the M3/6B suffix affect the packaging and reliability of the SMA6F8.5A-M3/6B?
"M3" denotes halogen-free, RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. "6B" specifies the 13-inch plastic tape-and-reel packaging format containing 14,000 units per reel. This packaging enables high-speed automated placement and ensures moisture sensitivity level (MSL) 1 compliance, allowing unlimited floor life and peak reflow up to 260 °C. The SMA6F8.5A-M3/6B's M3/6B designation confirms full process control and traceability for volume manufacturing environments.
SMA6F8.5A-M3/6B 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-M3/6B FAQ
1.How can I place an order for SMA6F8.5A-M3/6B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F8.5A-M3/6B 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-M3/6B reliable?
The price and inventory of SMA6F8.5A-M3/6B 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-M3/6B is usually 5 days.
3.What payment methods are accepted for SMA6F8.5A-M3/6B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F8.5A-M3/6B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F8.5A-M3/6B?
SMA6F8.5A-M3/6B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F8.5A-M3/6B 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-M3/6B?
For technical support, including SMA6F8.5A-M3/6B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F8.5A-M3/6B requirements.
6.How does Aetrix verify that SMA6F8.5A-M3/6B is sourced from the original manufacturer or authorized distributors?
All SMA6F8.5A-M3/6B 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-M3/6B meets industry standards.
7.What is the process for return or replacement of SMA6F8.5A-M3/6B?
All SMA6F8.5A-M3/6B units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F8.5A-M3/6B, 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-M3/6B part is unused and in its original packaging.
Return procedure for SMA6F8.5A-M3/6B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F8.5A-M3/6B Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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