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STMicroelectronics SMB6F12A
- Part No.:
- SMB6F12A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F12A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
SMB6F12A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a stand-off voltage of 12 V, clamping voltage of 19.9 V at 31 A (10/1000 µs), and operates up to 175 °C junction temperature-enabling robust protection in automotive body electronics and industrial power supplies.
For engineers reviewing the SMB6F12A datasheet, SMB6F12A pinout, SMB6F12A application, or SMB6F12A equivalent, key selection criteria include its low leakage current (0.2 µA @ 25 °C), flat SMB package (1 mm height), IEC 61000-4-2 ±30 kV ESD immunity, and dynamic resistance of 0.168 Ω-critical for fast-rising transients in compact, thermally constrained designs.
Technical Context
The SMB6F12A uses planar silicon junction technology to achieve low leakage and high thermal stability across –55 °C to +175 °C operating range. Its unidirectional configuration provides asymmetric clamping with forward conduction capability, supporting DC-biased protection paths without reverse leakage degradation.
It delivers 600 W peak pulse power under 10/1000 µs waveform and 4 kW under 8/20 µs surge, validated per IEC 61000-4-4 Level 4 (±4 kV) and ISO 10605 (±30 kV). Clamping performance is defined by VCL = 19.9 V at IPP = 31 A, with dynamic resistance RD = 0.168 Ω enabling precise overvoltage limiting during fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - Maximum continuous DC or RMS voltage before clamping begins; sets operating margin for 12 V systems. |
| Breakdown Voltage (VBR) | 13.3–14.7 V @ IBR = 1 mA - Confirmed voltage threshold where avalanche conduction initiates reliably. |
| Clamping Voltage (VCL) | 19.9 V @ IPP = 31 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustained energy-handling capacity defining surge survivability. |
| Leakage Current (IR) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimal standby power loss and signal integrity impact in always-on circuits. |
| Junction Temperature (Tj) | –55 to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and high-ambient environments. |
| Dynamic Resistance (RD) | 0.168 Ω - Low impedance during clamping ensures tight voltage control and reduced overshoot. |
Pinout & Package
The SMB6F12A is housed in an SMB Flat package (JEDEC DO-214AA), measuring 3.95 mm × 5.60 mm × 1.10 mm with matte tin-plated leads compliant to J-STD-020 MSL Level 1 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Current Sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / Ground Return | Typically tied to system ground or low-impedance return path; completes clamping loop with cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Flat 1 mm profile | Enables PCB height clearance in slim enclosures and automated assembly on dense layouts. |
| IEC 61000-4-2 ±30 kV ESD immunity | Exceeds Level 4 requirements for air and contact discharge-no external ESD staging needed. |
| High Tj max (175 °C) | Supports operation near heat sources (e.g., power converters) without derating or thermal shutdown. |
| Low dynamic resistance (0.168 Ω) | Minimizes clamping voltage rise under high-current surges, preserving downstream IC voltage tolerances. |
| UL94 V0 flammability rating | Ensures flame-retardant housing compliance for safety-critical industrial and automotive applications. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus and 12 V sensor supply lines from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary TVS clamp on power rail and bidirectional data lines, absorbing >400 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN/LIN transceivers during vehicle battery disconnection events. | Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Front-end transient suppressor placed before optocoupler or Schmitt trigger input stage. Use Value: Maintains input logic integrity during 2 kV/1 A surge tests per IEC 61000-4-4, eliminating false triggering or component failure. |
| Smart Meter Power Supply | POS Terminal USB Port Protection |
Use Scenario: Shielding AC/DC converter output and metering IC supply rails from mains-borne surges and lightning-induced spikes. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 3.3 V/5 V rails, coordinated with upstream MOVs and fuses. Use Value: Ensures metrology accuracy and firmware continuity after repeated 6 kV ring wave surges per IEC 61000-4-5. | Use Scenario: Hardening USB VBUS and D+/D− lines against ESD events during card-swipe or peripheral hot-plug operations. IC Role / Device Role / Timing Role: Unidirectional TVS array element protecting 5 V power and differential data lines simultaneously. Use Value: Passes ±15 kV HBM and ±30 kV IEC 61000-4-2 without signal distortion or port lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same SMB package, but rated for 600 W only (no 4 kW 8/20 µs spec); VCL = 19.9 V @ 30.2 A; RD = 0.175 Ω. | Limited to lower-energy surges; not validated for IEC 61000-4-4 Level 4. | Choose when cost sensitivity outweighs need for 4 kW surge headroom and full Level 4 compliance. |
| 1.5SMC12A | DO-214AB package (larger, 2.6 mm height); same 12 V VRWM, but VCL = 19.9 V @ 30.1 A; PPP = 1500 W (10/1000 µs). | Higher power rating but incompatible footprint; requires PCB redesign and higher board space. | Choose only if system demands >1 kW surge handling and vertical clearance allows taller package. |
Compared with SMBJ12A and 1.5SMC12A, SMB6F12A uniquely combines flat 1 mm profile, 4 kW 8/20 µs capability, and full IEC 61000-4-2/4-4 compliance-making it optimal for space-constrained, high-reliability 12 V DC systems requiring zero-compromise surge resilience.
Availability
SMB6F12A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, smart meter power supplies, and POS terminal USB protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMB6F12A 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 automotive, industrial, and power management solutions with broad IP and manufacturing scale.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for demanding DC power rail and interface protection where low leakage, high Tj, and flat-profile packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMB6F12A under a 10/1000 µs surge?
The SMB6F12A clamps to 19.9 V when subjected to a 31 A peak current under the standard 10/1000 µs waveform. This value is measured at Tamb = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMB6F12A be used in bidirectional signal line protection?
No-SMB6F12A is unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection (e.g., RS-485, USB D+/D−), a symmetric device like SMB6F12CA or dual-diode array is required; using SMB6F12A in reverse risks permanent breakdown.
Does SMB6F12A meet automotive AEC-Q200 stress testing requirements?
SMB6F12A is not AEC-Q200 qualified. While it operates up to 175 °C and passes IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200-certified TVS portfolio. For automotive-grade qualification, consider ST's SMAJ12A-Q or similar AEC-Q200-compliant variants.
What is the recommended PCB footprint for SMB6F12A?
The manufacturer specifies an IPC7531-compliant footprint: pad length 3.44 mm (0.136″), pad width 1.20 mm (0.047″), center-to-center spacing 5.84 mm (0.230″), with 2.07 mm (0.082″) solder mask opening between pads to prevent bridging during reflow.
SMB6F12A 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):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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
SMB6F12A FAQ
1.How can I place an order for SMB6F12A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F12A 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 SMB6F12A reliable?
The price and inventory of SMB6F12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F12A is usually 5 days.
3.What payment methods are accepted for SMB6F12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F12A?
SMB6F12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F12A 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 SMB6F12A?
For technical support, including SMB6F12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F12A requirements.
6.How does Aetrix verify that SMB6F12A is sourced from the original manufacturer or authorized distributors?
All SMB6F12A 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 SMB6F12A meets industry standards.
7.What is the process for return or replacement of SMB6F12A?
All SMB6F12A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F12A, 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 SMB6F12A part is unused and in its original packaging.
Return procedure for SMB6F12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F12A Tags
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