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STMicroelectronics SMB6F26A
- Part No.:
- SMB6F26A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,106
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Product details
Overview
SMB6F26A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB Flat package, designed to clamp ESD and surge transients up to 30 kV (IEC 61000-4-2) and 4 kV (IEC 61000-4-4). It features a standoff voltage (VRM) of 26 V, clamping voltage (VCL) of 42.1 V at 14.9 A (10/1000 µs), and operates up to 175 °C junction temperature - ideal for protecting automotive power line interfaces and industrial I/O ports.
For engineers reviewing the SMB6F26A datasheet, SMB6F26A pinout, SMB6F26A application, or SMB6F26A equivalent, key selection criteria include its low leakage current (0.2 µA @ 25 °C), flat 1 mm profile for space-constrained PCBs, high-temperature reliability, and compliance with IEC 61000-4-2 Level 4 and ISO 10605 ESD standards.
Technical Context
The SMB6F26A uses planar junction technology to achieve low leakage and stable breakdown behavior across temperature. Its unidirectional configuration enables DC-biased 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, supported by thermal resistance Rth(j-a) as low as 120 °C/W on recommended FR4 footprint. Dynamic resistance (RD) is 0.685 Ω, enabling precise clamping under fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 26 V - maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 28.9–31.9 V @ 1 mA - ensures reliable triggering margin above 26 V nominal rail |
| Clamping Voltage (VCL) | 42.1 V @ 14.9 A (10/1000 µs) - limits downstream IC stress during surge events |
| Peak Pulse Power | 600 W (10/1000 µs) - sustains industrial-grade surge immunity per IEC 61000-4-5 |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - minimizes standby power loss in battery-backed or low-power systems |
| Junction Temperature Range | −55 to +175 °C - supports under-hood automotive and high-temp industrial environments |
| ESD Withstand | ±30 kV air/contact discharge (IEC 61000-4-2 Level 4) - exceeds standard interface port requirements |
Pinout & Package
SMB6F26A is housed in an SMB Flat package (JEDEC MO-213AA), measuring 3.95 × 5.60 × 1.10 mm with matte tin-plated leads compliant to J-STD-002 and MIL-STD-750 Method 2026. The flat 1 mm profile enables low-profile mounting on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink terminal | Connected to protected line; conducts transient energy to ground during overvoltage |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop with minimal inductance |
Key Features
| Feature | Design Value |
|---|---|
| Planar junction construction | Enables stable VBR drift (< ±5.7 % from −55 to +175 °C) and long-term reliability in harsh environments |
| Low dynamic resistance (RD) | 0.685 Ω - reduces clamping overshoot and improves protection margin for sensitive 3.3 V/5 V logic |
| High-temperature power derating | Maintains 470 W (10/1000 µs) at Tj = 175 °C - critical for engine control units and motor drives |
| UL94 V0 flammability rating | Ensures PCB-level fire safety compliance in enclosed industrial enclosures and automotive modules |
| IPC7531-compliant footprint | Guarantees manufacturability with standard SMT reflow profiles and automated optical inspection (AOI) |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp transients within 1 ns response time. Use Value: Clamps to 42.1 V at 14.9 A, preventing damage to CAN transceivers and microcontrollers rated for ≤ 45 V absolute max. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff device mounted directly at connector entry point to shunt induced lightning-induced transients (IEC 61000-4-5). Use Value: Withstands 4 kV fast transient bursts (IEC 61000-4-4 Level 4) while maintaining < 0.2 µA leakage to avoid false triggering. |
| USB Type-C Port ESD Protection | Smart Meter Communication Interface |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB-C receptacles in portable test equipment. IC Role / Device Role / Timing Role: Back-to-back clamping element in series with primary polymer PTC, triggered only during > 30 kV contact discharge events. Use Value: Low capacitance (< 100 pF @ 1 V) avoids signal integrity degradation on 10 Gbps USB 3.2 Gen 2x2 links. |
Use Scenario: Protecting RS-485 transceivers in utility smart meters connected to long outdoor data lines. IC Role / Device Role / Timing Role: Unidirectional TVS placed across differential pair (A/B) and common-mode ground to suppress common-mode surges. Use Value: 175 °C operating range ensures functionality inside sealed meter enclosures subject to solar heating in desert climates. |
Availability
SMB6F26A is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC digital I/O, USB Type-C port ESD protection, and smart meter communication interface applications requiring stable component supply and full traceability.
Supply support for SMB6F26A 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust transient suppression in automotive and industrial environments where extended temperature operation and ESD immunity are mandatory.
FAQ
What is the difference between SMB6F26A and SMBJ26A?
SMB6F26A uses planar junction technology with lower leakage (0.2 µA vs. 1 µA typical for SMBJ26A) and higher temperature capability (175 °C vs. 150 °C), making it preferred for automotive under-hood use. Its SMB Flat package has 1 mm height versus 2.3 mm for SMBJ, enabling ultra-low-profile layouts.
Can SMB6F26A be used in bidirectional configurations?
No - SMB6F26A is unidirectional only. For bidirectional protection, ST offers the SMB6F26AT variant (dual-diode configuration). Using two SMB6F26A devices in series opposition is not recommended due to mismatched VBR and thermal imbalance under surge conditions.
What is the recommended PCB footprint for optimal thermal performance?
ST specifies a minimum copper area of 1.2 cm² per lead (2.4 cm² total) on 70 µm FR4 to achieve Rth(j-a) ≤ 120 °C/W. The IPC7531-compliant footprint shown in Figure 13 (3.44 mm pad width, 5.84 mm center-to-center) must be used with thermal vias under pads for high-reliability designs.
Does SMB6F26A meet AEC-Q200 stress testing requirements?
No - SMB6F26A is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC/ISO surge standards, ST does not certify this part for automotive qualification. For AEC-Q200-compliant TVS, consider ST's SMAJ26A-Q or SMF26A-Q series.
SMB6F26A 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):
- 26V (Max)
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 14.9A
- 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
SMB6F26A FAQ
1.How can I place an order for SMB6F26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F26A 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 SMB6F26A reliable?
The price and inventory of SMB6F26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F26A is usually 5 days.
3.What payment methods are accepted for SMB6F26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F26A?
SMB6F26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F26A 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 SMB6F26A?
For technical support, including SMB6F26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F26A requirements.
6.How does Aetrix verify that SMB6F26A is sourced from the original manufacturer or authorized distributors?
All SMB6F26A 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 SMB6F26A meets industry standards.
7.What is the process for return or replacement of SMB6F26A?
All SMB6F26A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F26A, 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 SMB6F26A part is unused and in its original packaging.
Return procedure for SMB6F26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F26A Tags
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