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Vishay General Semiconductor - Diodes Division SMA6F12AHD-M3/6A
- Part No.:
- SMA6F12AHD-M3/6A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F12AHD-M3/6A.pdf
- Description:
- TVS DIODE 12VWM 22.9VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,589
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Product details
Overview
SMA6F12AHD-M3/6A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 12 V stand-off voltage (VWM), 13.2–14.3 V breakdown voltage (VBR) at 1 mA, 18.5 V maximum clamping voltage (VC) at 22.9 A (8/20 μs), 600 W peak pulse power (10/1000 μs), and IEC 61000-4-2 level 4 ESD protection (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F12AHD-M3/6A datasheet, SMA6F12AHD-M3/6A pinout, SMA6F12AHD-M3/6A application, or SMA6F12AHD-M3/6A equivalent, this device is selected for robust overvoltage protection in space-constrained industrial sensor interfaces, automotive body electronics, and USB/serial line surge immunity where low-profile mounting and high-energy transient absorption are critical.
Technical Context
This TVS diode operates as a unidirectional clamping device with a Zener-based avalanche structure, activated only during reverse-biased overvoltage events. Its thermal resistance junction-to-ambient is 120–150 °C/W (FR4 PCB, 2 oz.), enabling reliable operation up to TJ = 175 °C and supporting derated power dissipation above TA = 25 °C per Figure 2.
The device exhibits a voltage temperature coefficient (αT) of +0.055 × 10⁻⁴ /°C, ensuring predictable VBR drift across operating temperature. Clamping behavior follows VC = RD × IPP + VBR(max), with dynamic resistance RD = 0.130 Ω, directly determining voltage overshoot under fast transients like 8/20 μs surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR (min/max) | 13.2 V / 14.3 V at 1 mA - Breakdown threshold range; ensures consistent turn-on across production units and temperature. |
| VC @ IPP | 18.5 V at 22.9 A (8/20 μs) - Maximum clamped voltage seen by downstream ICs during high-energy surges; limits stress on sensitive components. |
| PPPM (10/1000 μs) | 600 W - Sustained transient energy handling capability; suitable for inductive switching spikes in motor drivers and relay circuits. |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV (air), 8 kV (contact) - Validates robustness against human-body-model electrostatic discharge in end-user environments. |
| Package | SlimSMA (DO-221AC) - 0.95 mm typical height, MSL Level 1, halogen-free, RoHS-compliant; enables automated placement on dense PCBs. |
| TJ max. | 175 °C - Maximum junction temperature; supports operation in under-hood automotive or industrial enclosures without forced cooling. |
Pinout & Package
SlimSMA (DO-221AC) package: surface-mount, single-ended cathode-band-marked case, matte tin-plated terminals, compliant with J-STD-002 and JESD22-B102 solderability standards. M3 suffix indicates halogen-free, RoHS-compliant, industrial-grade construction meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; completes clamping loop during transient events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., VBUS, CAN_H, sensor output); absorbs surge current into ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (0.95 mm typical height) | Enables use in ultra-thin consumer electronics and stacked PCB assemblies where Z-axis clearance is constrained. |
| Peak pulse power: 4 kW (8/20 μs) | Handles lightning-induced surges and high-dI/dt transients common in industrial fieldbus and automotive power distribution. |
| Unidirectional configuration | Prevents forward conduction during normal operation while providing precise reverse-biased clamping-ideal for DC-biased signal lines. |
| MSL Level 1, LF peak 260 °C | Supports standard lead-free reflow profiles without moisture-related popcorn failure or delamination risk. |
| ESD immunity: 15 kV air / 8 kV contact | Meets stringent end-equipment ESD compliance requirements without requiring additional external protection stages. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in vehicle door modules. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground to clamp negative transients and suppress ESD. Use Value: Limits clamped voltage to ≤18.5 V, preventing damage to 5 V or 3.3 V transceivers while maintaining signal integrity during 22.9 A surge events. |
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role: Reverse-biased TVS on sensor output line to absorb inductive kickback from solenoid actuation nearby. Use Value: Withstands 600 W (10/1000 μs) pulses without degradation, ensuring long-term reliability in harsh electromagnetic environments. |
| USB 2.0 Data Line Protection | DC Power Input Stage (12 V Rail) |
Use Scenario: ESD and surge protection for D+ and D− lines in embedded USB host ports used in medical handheld devices. IC Role / Device Role: Low-capacitance unidirectional TVS placed inline with each data line to ground, preserving signal rise/fall times. Use Value: Achieves <15 pF junction capacitance (per Fig. 4), minimizing USB 2.0 eye diagram distortion while delivering 8 kV contact ESD immunity. |
Use Scenario: Primary overvoltage clamp on 12 V input rail of industrial gateways exposed to battery jump-start transients. IC Role / Device Role: Front-end TVS connected between VIN and GND to shunt >100 V spikes before they reach DC/DC converters and PMICs. Use Value: Clamps 8/20 μs surges to 18.5 V at 22.9 A, limiting downstream component stress and avoiding brownout or latch-up in power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F12A-M3/6A | VBR min/max = 13.3 V / 14.7 V; VC = 18.8 V at 23.5 A (8/20 μs); slightly higher clamping voltage and lower ESD robustness (no explicit level 4 rating stated in same doc revision). | Same footprint and function but marginally less aggressive clamping; suitable where tighter VBR tolerance is not required. | Select SMA6F12AHD-M3/6A when lowest possible clamping voltage and certified IEC 61000-4-2 level 4 are mandatory. |
| SMAJ12A-M3/61 | Higher PPPM (400 W @ 10/1000 μs vs. 600 W); larger SMA (DO-214AC) package (2.4 mm height); VBR = 13.3–14.7 V; VC = 19.9 V at 20.1 A. | Compatible function but incompatible footprint; requires PCB redesign; better suited for higher-power, less space-constrained designs. | Choose SMAJ12A-M3/61 only if board layout allows DO-214AC and higher clamping voltage is acceptable. |
Compared with SMA6F12A-M3/6A, SMA6F12AHD-M3/6A delivers lower clamping voltage and verified level 4 ESD performance in the same SlimSMA package; versus SMAJ12A-M3/61, it trades off some pulse power for 60 % lower profile and superior board-level integration-making it optimal for miniaturized, high-reliability systems.
Availability
SMA6F12AHD-M3/6A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB 2.0 port protection, and 12 V DC power input stages requiring stable component supply and long-term lifecycle continuity.
Supply support for SMA6F12AHD-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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMA6F series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in compact, surface-mount form factors targeting automotive, industrial, and communications infrastructure applications.
FAQ
What is the clamping voltage of SMA6F12AHD-M3/6A under an 8/20 μs surge?
The SMA6F12AHD-M3/6A has a maximum clamping voltage (VC) of 18.5 V at 22.9 A for an 8/20 μs waveform, as specified in the Electrical Characteristics table on page 2 of Vishay document 89458. This value represents the peak voltage seen across the device during standardized surge testing and defines the upper voltage limit imposed on protected circuitry.
Is SMA6F12AHD-M3/6A compatible with lead-free reflow soldering?
Yes, SMA6F12AHD-M3/6A meets MSL Level 1 per J-STD-020 and supports a maximum lead-free reflow peak temperature of 260 °C. Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102, and the M3 suffix confirms qualification for industrial-grade assembly processes including standard Pb-free thermal profiles.
How does SMA6F12AHD-M3/6A differ from SMA6F12A-M3/6A?
SMA6F12AHD-M3/6A specifies a tighter VBR range (13.2–14.3 V vs. 13.3–14.7 V), lower clamping voltage (18.5 V vs. 18.8 V at rated IPP), and explicitly documented IEC 61000-4-2 level 4 ESD rating (15 kV air / 8 kV contact). Both share the SlimSMA package and 12 V VWM, but the HD variant offers improved transient response consistency and certified ESD robustness.
What is the thermal resistance of SMA6F12AHD-M3/6A on a standard PCB?
The typical thermal resistance junction-to-ambient (RθJA) for SMA6F12AHD-M3/6A is 120–150 °C/W when mounted on an FR4 PCB with 2 oz. copper and standard footprint, per Thermal Characteristics table on page 3 of Vishay document 89458. This value governs power derating above TA = 25 °C and must be applied in thermal design calculations.
Can SMA6F12AHD-M3/6A be used in bidirectional protection circuits?
No, SMA6F12AHD-M3/6A is a unidirectional TVS diode and is not suitable for bidirectional protection. Its electrical characteristics-including breakdown voltage, clamping behavior, and polarity marking-are defined only for reverse-biased operation. For AC or dual-polarity signal lines, a dedicated bidirectional TVS such as SMA6F12AY-M3/6A (if available) or discrete back-to-back configuration is required.
SMA6F12AHD-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):
- 12V
- Voltage - Breakdown (Min):
- 13.2V
- Voltage - Clamping (Max) @ Ipp:
- 22.9V
- Current - Peak Pulse (10/1000µs):
- 157A (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)
SMA6F12AHD-M3/6A FAQ
1.How can I place an order for SMA6F12AHD-M3/6A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F12AHD-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 SMA6F12AHD-M3/6A reliable?
The price and inventory of SMA6F12AHD-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 SMA6F12AHD-M3/6A is usually 5 days.
3.What payment methods are accepted for SMA6F12AHD-M3/6A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F12AHD-M3/6A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F12AHD-M3/6A?
SMA6F12AHD-M3/6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F12AHD-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 SMA6F12AHD-M3/6A?
For technical support, including SMA6F12AHD-M3/6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F12AHD-M3/6A requirements.
6.How does Aetrix verify that SMA6F12AHD-M3/6A is sourced from the original manufacturer or authorized distributors?
All SMA6F12AHD-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 SMA6F12AHD-M3/6A meets industry standards.
7.What is the process for return or replacement of SMA6F12AHD-M3/6A?
All SMA6F12AHD-M3/6A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F12AHD-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 SMA6F12AHD-M3/6A part is unused and in its original packaging.
Return procedure for SMA6F12AHD-M3/6A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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