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STMicroelectronics SMB6F26AY
- Part No.:
- SMB6F26AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F26AY.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,486
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Product details
Overview
SMB6F26AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 42.1 V (10/1000 µs) with 14.9 A peak pulse current and 0.685 Ω dynamic resistance at 25 °C. It delivers 600 W peak pulse power (10/1000 µs), operates up to 175 °C junction temperature, and protects 12 V automotive circuits against ISO 7637-2 pulses (Pulse 1, 2a, 3a, 3b) and ISO 10605 ESD events.
For engineers reviewing the SMB6F26AY datasheet, SMB6F26AY pinout, SMB6F26AY application, or SMB6F26AY equivalent, key selection criteria include clamping voltage under 42.1 V at 14.9 A, low leakage (≤0.2 μA @ 25 °C), flat 1 mm profile for space-constrained PCB layouts, and compliance with IEC 61000-4-2 Level 4 (±30 kV contact/air discharge) and ISO 7637-2 automotive surge immunity.
Technical Context
This unidirectional TVS diode uses planar silicon technology to achieve low leakage current (0.2 μA @ 25 °C, 1 μA @ 85 °C) and stable performance across –55 °C to +175 °C junction temperature range. Its 26 V stand-off voltage (VRM) and 28.9–31.9 V breakdown range (VBR at IBR = 1 mA) enable precise protection of 12 V battery rail interfaces without false triggering.
The device exhibits 0.685 Ω dynamic resistance (RD) at 25 °C, enabling predictable clamping behavior during fast transients like ISO 7637-2 Pulse 3b (+150 V). Its 1 mm profile and IPC7531-compliant footprint support high-density automotive PCB assembly while maintaining thermal robustness via JEDEC-registered SMB Flat outline and matte tin-plated leads rated for 260 °C soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 26 V - Maximum continuous reverse operating voltage before conduction begins; matches 12 V automotive system nominal with margin for ripple and load dump. |
| Breakdown Voltage (VBR) | 28.9–31.9 V at 1 mA - Ensures reliable turn-on above normal operating voltage but below IC damage thresholds in protected circuits. |
| Clamping Voltage (VCL) | 42.1 V at 14.9 A (10/1000 µs) - Limits transient voltage seen by downstream components to safe levels during ISO 7637-2 Pulse 1 (–150 V) or Pulse 3b (+150 V). |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustains high-energy surges common in automotive load dump and ESD events without degradation. |
| Leakage Current (IRM) | 0.2 μA @ 25 °C, 1 μA @ 85 °C - Minimizes standby power loss and avoids false triggering in always-on vehicle modules (e.g., body control units). |
| Junction Temperature (Tj) | –55 to +175 °C - Supports under-hood placement near engines or powertrain ECUs where ambient temperatures exceed 125 °C. |
| Dynamic Resistance (RD) | 0.685 Ω @ 25 °C - Enables accurate clamping voltage prediction (VCL ≈ VBR + RD × IPP) for robust circuit protection design. |
Pinout & Package
SMB6F26AY is housed in a surface-mount SMB Flat package (JEDEC DO-214AA), measuring 3.30–3.95 mm in length (D), 5.20–5.60 mm in width (E), and 0.90–1.10 mm in height (A), with 1 mm profile optimized for low-profile automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked side) | Transient current sink | Connected to protected line (e.g., CAN_H, LIN, sensor supply); conducts surge energy to ground during overvoltage events. |
| Anode | Reference node | Connected to system ground or low-impedance return path; completes clamping loop with minimal inductance for effective fast-transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, and mechanical stress cycles-enables deployment in safety-critical ECUs without additional qualification. |
| Flat 1 mm profile | Reduces board height clearance requirements in tight engine bay or ADAS module enclosures while maintaining thermal dissipation via copper pad layout per Figure 17. |
| ISO 10605 ESD immunity | Withstands ±30 kV contact/air discharge (C = 150 pF / 330 Ω and C = 330 pF / 330 Ω), exceeding Level 4 for robust protection of exposed connectors and sensors. |
| ISO 7637-2 surge compliance | Clamps Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), and Pulse 3b (+150 V) on 12 V systems without failure or parameter shift. |
| Matte tin lead finish | Meets J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026-ensures reliable solder joint formation and long-term intermetallic stability in reflow assembly. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Sensor Interface |
|---|---|
|
Use Scenario: Protecting LIN bus lines and door actuator drivers from battery transients and ESD during service operations. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between LIN transceiver and 12 V supply rail. Use Value: Prevents latch-up or permanent damage to LIN PHY ICs during ISO 7637-2 Pulse 3b (+150 V) events while maintaining <0.2 μA leakage to preserve sleep-mode current budget. |
Use Scenario: Safeguarding analog inputs of pressure/temperature sensors connected to 12 V battery-supplied ECU front-end. IC Role / Device Role / Timing Role: Standoff protection element shunting surge energy away from precision ADC input stages. Use Value: Clamps transients to ≤42.1 V during ISO 7637-2 Pulse 1 (–150 V), ensuring sensor signal integrity remains within ADC's absolute maximum rating and avoiding calibration drift. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Input | Electric Power Steering (EPS) Motor Driver Protection |
|
Use Scenario: Shielding 12 V input of image sensor modules from load dump and jump-start surges in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter input stage. Use Value: Absorbs 600 W (10/1000 µs) energy without thermal runaway, enabling uninterrupted camera operation during cold-cranking or alternator regulation faults. |
Use Scenario: Protecting H-bridge gate drivers and current sense amplifiers from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: Fast-response transient suppressor on motor supply rail adjacent to MOSFET half-bridge. Use Value: Limits voltage overshoot to ≤42.1 V during 8/20 µs switching transients, preventing gate oxide rupture and maintaining functional safety ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A | Same SMB package, 600 W rating, but higher clamping voltage (45.4 V @ 13.8 A) and lower Tj max (150 °C). | Limited suitability for 12 V systems requiring tight clamping margins; not AEC-Q101 qualified. | Select when cost sensitivity outweighs AEC-Q101 requirement and clamping headroom >3.3 V is acceptable. |
| SMCJ26A | Larger SMC package (DO-214AB), same 600 W rating, clamping voltage 45.4 V @ 13.8 A, Tj max 150 °C, no AEC-Q101 certification. | Requires more PCB area; unsuitable for space-constrained automotive modules targeting AEC-Q101 compliance. | Choose only if existing SMC footprint reuse is mandatory and thermal derating allows 150 °C operation. |
Compared with SMBJ26A and SMCJ26A, SMB6F26AY provides tighter clamping (42.1 V vs. 45.4 V), extended junction temperature capability (+175 °C vs. +150 °C), and formal AEC-Q101 qualification-making it the preferred choice for next-generation automotive electronics where reliability, miniaturization, and specification compliance are non-negotiable.
Availability
SMB6F26AY is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS camera power supplies, and electric power steering systems requiring stable component supply across multi-year production cycles.
Supply support for SMB6F26AY 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 vertical manufacturing and broad IP portfolio.
SMB6F26AY belongs to the SMB6FxxAY series-a family of AEC-Q101-qualified unidirectional TVS diodes engineered specifically for robust transient suppression in 12 V and 24 V automotive electrical architectures.
FAQ
What is the maximum clamping voltage of SMB6F26AY under standard test conditions?
The maximum clamping voltage (VCL) of SMB6F26AY is 42.1 V at 14.9 A for a 10/1000 µs waveform and 25 °C ambient temperature, as specified in Table 2 of DS12412. This value increases with junction temperature per the αT coefficient (9.7 × 10⁻⁴/°C), reaching ~45.3 V at 175 °C junction temperature under full-rated surge current.
Does SMB6F26AY meet automotive ESD standards beyond ISO 10605?
Yes-SMB6F26AY exceeds IEC 61000-4-2 Level 4 (±30 kV contact/air discharge, C = 150 pF/R = 330 Ω) and supports dual-capacitance ESD testing (C = 330 pF/R = 330 Ω) at the same ±30 kV levels. It also complies with UL94 V0 flammability and J-STD-020 MSL Level 1 moisture sensitivity requirements for automotive PCB assembly.
How does the SMB Flat package improve thermal performance compared to standard SMB?
The SMB Flat package reduces height to 1.10 mm max and optimizes thermal path via extended copper pad recommendations (Figure 17), achieving Rth(j-a) as low as 120 °C/W with 2 cm² copper area-~25% lower than standard SMB. This enables sustained 470 W surge handling at 175 °C junction temperature, critical for under-hood applications.
Can SMB6F26AY be used in 24 V commercial vehicle systems?
No-SMB6F26AY is rated for 26 V stand-off voltage and targets 12 V automotive systems. For 24 V applications, ST recommends SMB6F33AY (33 V VRM) or SMB6F36AY (36 V VRM), which provide appropriate margin above nominal 24 V rail while maintaining identical AEC-Q101 qualification, SMB Flat packaging, and ISO 7637-2 compliance.
SMB6F26AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxAY
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
SMB6F26AY FAQ
1.How can I place an order for SMB6F26AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F26AY 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 SMB6F26AY reliable?
The price and inventory of SMB6F26AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F26AY is usually 5 days.
3.What payment methods are accepted for SMB6F26AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F26AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F26AY?
SMB6F26AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F26AY 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 SMB6F26AY?
For technical support, including SMB6F26AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F26AY requirements.
6.How does Aetrix verify that SMB6F26AY is sourced from the original manufacturer or authorized distributors?
All SMB6F26AY 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 SMB6F26AY meets industry standards.
7.What is the process for return or replacement of SMB6F26AY?
All SMB6F26AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F26AY, 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 SMB6F26AY part is unused and in its original packaging.
Return procedure for SMB6F26AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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