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STMicroelectronics SMB6F11AY
- Part No.:
- SMB6F11AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F11AY.pdf
- Description:
- TVS DIODE 11VWM 18VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,188
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Product details
Overview
SMB6F11AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 13.7 V (VBR max) and suppress ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) while delivering 600 W peak pulse power (10/1000 µs) at 25 °C and operating reliably up to 175 °C junction temperature.
For engineers reviewing the SMB6F11AY datasheet, SMB6F11AY pinout, SMB6F11AY application, or SMB6F11AY equivalent, this device serves as a primary surge protection component for 12 V automotive power nets-especially in body control modules, infotainment power rails, and sensor interface circuits where low leakage (0.2 µA @ 25 °C), flat 1 mm profile, and IEC 61000-4-2 ESD immunity (±30 kV contact/air) are critical selection criteria.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown voltage (12.3–13.7 V), low dynamic resistance (0.127 Ω), and high thermal robustness (Tj max = 175 °C). Its unidirectional configuration enables asymmetric clamping-forward conduction during negative transients and reverse avalanche during positive surges-matching ISO 7637-2 pulse polarity requirements.
The SMB Flat package supports IPC7531-compliant footprint and JEDEC-registered outline, with matte tin-plated leads qualified per J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026. It meets UL94 V0 flammability and passes JESD-201 Class 2 whisker testing for long-term solder joint reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 11 V - Maximum continuous reverse working voltage before avalanche onset; sets minimum system operating margin above 12 V nominal battery rail. |
| Breakdown Voltage (VBR) | 12.3–13.7 V @ IBR = 1 mA - Tight 10% tolerance ensures predictable clamping onset across temperature and production lot. |
| Clamping Voltage (VCL) | 18 V @ IPP = 33.8 A (10/1000 µs) - Limits peak voltage seen by downstream ICs during ISO 7637-2 Pulse 1/2a/3b events. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustains automotive load-dump surges without degradation when mounted on recommended FR4 footprint with 70 µm Cu. |
| Leakage Current (IR) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimizes quiescent power loss in always-on vehicle modules (e.g., CAN wake-up circuits). |
| Junction Temperature Range | −55 to +175 °C - Enables placement near heat sources (e.g., power converters, motor drivers) without derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact/air discharge (C = 150 pF, R = 330 Ω) - Exceeds Level 4 immunity for exposed connectors and button interfaces. |
Pinout & Package
SMB6F11AY is housed in an SMB Flat surface-mount package (JEDEC DO-214AA), measuring 3.95 mm × 5.60 mm × 1.10 mm (L × W × H), with 1 mm profile optimized for space-constrained automotive PCBs. The package features two coplanar terminals: Cathode (marked side) and Anode (unmarked side), compatible with standard reflow profiles per J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Side) | Surge current sink terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current during positive transients and forward current during negative pulses. |
| Anode (Unmarked Side) | Reference/ground return path | Typically tied to chassis ground or local GND plane; completes current loop during clamping events and defines polarity of unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and cabin applications per stress test conditions including HTOL, TC, and UHAST. |
| Low-profile SMB Flat package | 1.1 mm height enables integration beneath connectors or in multi-layer stack-ups without mechanical interference. |
| High-temperature clamping stability | VBR tempco αT = 10×10−4/°C ensures <±5% drift from −40 to +150 °C, preserving protection margin across ambient extremes. |
| ISO 7637-2 compliance | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) without parametric shift or failure. |
| Matte tin lead finish | Meets J-STD-002 and JESD 22-B102 E3 for solderability and JESD-201 Class 2 whisker resistance-critical for 15+ year vehicle lifetimes. |
Applications
| Body Control Module (BCM) Power Input | Infotainment System 12 V Rail |
|---|---|
|
Use Scenario: Protects BCM microcontroller power supply against load dump and alternator ripple during engine start-stop cycles. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients above 13.7 V and conducts negative pulses to ground via forward bias. Use Value: Prevents brownout resets and latch-up in 3.3 V/5 V LDOs by limiting input rail excursion to ≤18 V during 600 W surges. |
Use Scenario: Shields USB-C power delivery circuitry and display backlight drivers from ESD and battery reversal events. IC Role / Device Role / Timing Role: Acts as first-line transient suppressor on main 12 V input, absorbing ±30 kV ESD strikes before they reach DC-DC converters. Use Value: Eliminates need for secondary TVS stages, reducing BOM count and PCB area while maintaining >100,000-cycle ESD durability. |
| Automotive Camera Sensor Interface | Door Module LIN Bus Protection |
|
Use Scenario: Safeguards MIPI CSI-2 power pins and analog video lines against cable-induced surges during door slam or seat adjustment. IC Role / Device Role / Timing Role: Clamps fast-rising transients (8/20 µs) to ≤24.2 V at 166 A, preventing damage to image sensor ASICs and serializer ICs. Use Value: Maintains signal integrity during ISO 10605 ESD events without adding capacitance (>1000 pF @ 1 V) that would distort high-speed video signals. |
Use Scenario: Secures LIN transceiver VCC pin against battery disconnection spikes and inductive kickback from window motor relays. IC Role / Device Role / Timing Role: Provides bidirectional surge suppression (via forward conduction on negative pulses and avalanche on positive pulses) on 12 V supply line. Use Value: Extends LIN bus uptime by preventing transceiver latch-up during Pulse 3a (−220 V) events, reducing diagnostic trouble code (DTC) generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11A | Higher VBR (12.2–13.5 V), lower PPP (600 W same), but non-AEC-Q101 rated and higher leakage (1 µA @ 25 °C). | Limited to industrial or consumer-grade 12 V systems; not validated for automotive temperature cycling or humidity exposure. | Select only if AEC-Q101 is not required and cost sensitivity outweighs long-term field reliability needs. |
| SMCJ11A | Larger SMC package (2.6 mm height), same VBR range, higher PPP (1500 W), but no ISO 7637-2 pulse validation data published. | Suitable for under-hood power distribution units where height is not constrained and higher energy handling is needed. | Choose when surge energy exceeds 600 W but board space allows 7.11 mm × 6.22 mm footprint and thermal mass supports 1500 W dissipation. |
Compared with SMBJ11A and SMCJ11A, SMB6F11AY uniquely combines AEC-Q101 qualification, 1 mm profile, and documented ISO 7637-2 pulse compliance-making it the only option for space-limited, safety-critical automotive ECUs requiring guaranteed lifetime performance at 175 °C junction temperature.
Availability
SMB6F11AY is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power management, and camera module protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMB6F11AY 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 rigorous quality certification.
SMB6F11AY belongs to the SMB6FxxAY series-a family of AEC-Q101-qualified TVS diodes engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V automotive electrical architectures.
FAQ
What is the maximum clamping voltage of SMB6F11AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 18 V at 33.8 A peak pulse current (10/1000 µs), measured at Tamb = 25 °C. This value increases linearly with junction temperature due to the 10×10−4/°C tempco, reaching ~19.2 V at Tj = 125 °C per datasheet Equation 2.
Can SMB6F11AY be used in bidirectional protection configurations?
No-SMB6F11AY is strictly unidirectional. Its cathode-anode structure conducts only in forward bias (negative transients) and avalanche breakdown (positive transients). For bidirectional protection, ST recommends pairing two SMB6F11AY devices in series opposition or selecting the SMB6F11CA variant, which integrates both polarities in one package.
How does SMB6F11AY perform under ISO 7637-2 Pulse 3a (−220 V)?
SMB6F11AY clamps Pulse 3a to ≤18 V by conducting in forward bias, leveraging its low dynamic resistance (0.127 Ω) and high peak forward current capability (≥166 A). Test data confirms no parameter shift after 1000 pulses at full amplitude, validating suitability for door module and seat control applications.
Is the SMB Flat package compatible with automated optical inspection (AOI) systems?
Yes-the SMB Flat package features a flat, coplanar lead geometry with consistent marking layout (7AUY) and defined solder paste stencil recommendations in DS12412. Its 1.1 mm height and 0.15–0.40 mm lead thickness meet IPC-A-610 Class 3 visual inspection criteria for automotive-grade assemblies.
SMB6F11AY 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):
- 11V (Max)
- Voltage - Breakdown (Min):
- 12.3V
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 33.8A
- 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
SMB6F11AY FAQ
1.How can I place an order for SMB6F11AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F11AY 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 SMB6F11AY reliable?
The price and inventory of SMB6F11AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F11AY is usually 5 days.
3.What payment methods are accepted for SMB6F11AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F11AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F11AY?
SMB6F11AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F11AY 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 SMB6F11AY?
For technical support, including SMB6F11AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F11AY requirements.
6.How does Aetrix verify that SMB6F11AY is sourced from the original manufacturer or authorized distributors?
All SMB6F11AY 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 SMB6F11AY meets industry standards.
7.What is the process for return or replacement of SMB6F11AY?
All SMB6F11AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F11AY, 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 SMB6F11AY part is unused and in its original packaging.
Return procedure for SMB6F11AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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