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STMicroelectronics SMB6F5.0AY
- Part No.:
- SMB6F5.0AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F5.0AY.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
SMB6F5.0AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 9.2 V at 68 A (10/1000 µs), with stand-off voltage of 5.0 V, leakage current ≤0.2 µA at 25 °C, and peak pulse power rating of 600 W. It protects CAN, LIN, and sensor interfaces in 12 V automotive systems against ISO 7637-2 pulses and IEC 61000-4-2 ESD events.
For engineers reviewing the SMB6F5.0AY datasheet, SMB6F5.0AY pinout, SMB6F5.0AY application, or SMB6F5.0AY equivalent, key selection criteria include clamping voltage (9.2 V @ 68 A), low leakage (<1 µA up to 85 °C), junction temperature capability up to +175 °C, and compliance with ISO 10605 ±30 kV (air/contact discharge) and ISO 7637-2 Pulse 1/2a/3a/3b.
Technical Context
This unidirectional TVS diode uses planar silicon technology to achieve low dynamic resistance (0.031 Ω) and stable breakdown behavior across temperature. Its 5.0 V stand-off voltage enables direct protection of 5 V logic rails and microcontroller I/O lines without forward conduction during normal operation.
The device meets stringent automotive surge immunity requirements: it suppresses ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) on 12 V battery networks while maintaining <10 µA leakage at rated VRM and operating reliably up to Tj = +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 5.0 V - Ensures no conduction during nominal 5 V rail operation; defines maximum continuous reverse bias before breakdown. |
| Breakdown Voltage (VBR) | 6.4–7.1 V @ IBR = 1 mA - Tight tolerance window guarantees predictable turn-on under transients without false triggering. |
| Clamping Voltage (VCL) | 9.2 V @ IPP = 68 A (10/1000 µs) - Limits downstream voltage stress to safe levels for 5 V ICs during surge events. |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - Sustains high-energy surges typical of load dump and inductive switching in automotive environments. |
| Leakage Current (IRM) | ≤0.2 µA @ 25 °C, ≤1 µA @ 85 °C - Minimizes standby power loss and avoids signal integrity degradation in always-on circuits. |
| Junction Temperature Range | −55 °C to +175 °C - Supports under-hood placement and long-term reliability in extreme thermal conditions. |
| Dynamic Resistance (RD) | 0.031 Ω - Low impedance ensures rapid voltage clamping and minimal overshoot during fast transients. |
Pinout & Package
SMB6F5.0AY 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-002 and MIL-STD-750 Method 2026. The flat profile (1 mm height) supports automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Return Path | Connected to ground or low-impedance return node; carries full transient current during clamping. |
| Anode | Protected Line Input | Connected to the signal or power line being protected (e.g., CAN_H, LIN bus, sensor supply); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime reliability per stress test standards. |
| Low-profile SMB Flat package | 1.1 mm max height enables integration in compact ECUs and ADAS modules where Z-axis clearance is constrained. |
| ISO 10605 ±30 kV ESD robustness | Withstands contact and air discharge at highest severity level without parameter shift or failure. |
| High-temperature operation (Tj = +175 °C) | Enables placement near heat sources (e.g., power converters, engine control units) without derating. |
| Planar silicon construction | Delivers stable VBR drift (αT = 5.7 × 10⁻⁴ /°C) and low leakage across full temperature range. |
Applications
| Automotive CAN Bus Protection | Engine Control Unit (ECU) Sensor Inputs |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L lines in body control modules against load dump and ESD during vehicle assembly and service. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppression placed between bus line and chassis ground. Use Value: Clamps ISO 7637-2 Pulse 2a (+112 V) to <9.5 V, preserving CAN transceiver functionality and preventing bit errors. |
Use Scenario: Safeguarding analog inputs (e.g., MAP, O2, coolant temp sensors) connected to 5 V MCU ADC channels. IC Role / Device Role / Timing Role: Standoff-rated TVS placed at connector entry point to shunt transients before reaching precision front-end circuitry. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding DC offset errors in ratiometric sensor measurements. |
| Automotive LIN Bus Interface | Infotainment System Power Rails |
|
Use Scenario: Securing LIN slave nodes (e.g., door modules, seat controls) against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping device tied between LIN line and ground, sized for 12 V system compatibility. Use Value: Withstands ISO 7637-2 Pulse 1 (−150 V) with VCL <9.5 V, ensuring uninterrupted communication during cranking events. |
Use Scenario: Protecting 5 V power distribution to USB ports, display drivers, and audio amplifiers in head units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 5 V rail, coordinated with upstream fuse and secondary filtering. Use Value: Delivers 600 W peak power handling at 10/1000 µs, absorbing energy from alternator load dump without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | Same SMB package, but lower PPP (600 W vs. SMB6F5.0AY's 600 W), higher VBR (6.7–7.4 V), and higher VCL (10.5 V @ 68 A). | Marginally higher clamping voltage may risk 5 V IC damage during worst-case surges; suitable only if system margin allows ≥10.5 V transient tolerance. | Select when footprint compatibility is critical and clamping voltage margin permits; verify VCL against downstream IC absolute max ratings. |
| 1.5SMC5.0A | DO-214AB package (larger), same VRM/VBR, but higher VCL (11.4 V @ 53 A) and lower IPP capability (53 A vs. 68 A). | Reduced surge current handling limits effectiveness in high-energy ISO 7637-2 Pulse 3a (−220 V) scenarios common in powertrain modules. | Prefer only for non-automotive industrial designs where AEC-Q101 is not required and PCB space allows larger footprint. |
Compared with SMBJ5.0A and 1.5SMC5.0A, SMB6F5.0AY delivers lower clamping voltage (9.2 V), tighter VBR tolerance, and AEC-Q101 validation-making it the optimal choice for safety-critical 5 V automotive signal and power line protection where thermal and ESD margins are constrained.
Availability
SMB6F5.0AY is available at Aetrix Electronics and suitable for automotive CAN/LIN bus protection, engine control unit sensor interface hardening, and infotainment power rail safeguarding requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMB6F5.0AY 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.
SMB6F5.0AY belongs to the SMB6FxxAY automotive TVS series, engineered specifically to meet ISO 7637-2 and ISO 10605 immunity requirements in harsh-temperature vehicle subsystems while minimizing leakage and board space.
FAQ
What is the maximum clamping voltage of SMB6F5.0AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 9.2 V at 68 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature per αT = 5.7 × 10⁻⁴ /°C, reaching approximately 9.8 V at Tj = 125 °C using the formula VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Does SMB6F5.0AY support bidirectional transient suppression?
No - SMB6F5.0AY is a unidirectional TVS diode, intended for DC-biased lines like 5 V power rails or CAN/LIN buses referenced to ground. It conducts only in reverse breakdown; forward conduction occurs above ~1.2 V, making it unsuitable for AC or bipolar signal protection without external circuitry.
How does SMB6F5.0AY perform under ISO 7637-2 Pulse 3b (+150 V)?
Under ISO 7637-2 Pulse 3b (exponential decay, +150 V, 50 Ω source), SMB6F5.0AY clamps the line to ≤9.5 V with full energy dissipation. Its 600 W peak power rating and low dynamic resistance (0.031 Ω) ensure reliable suppression without thermal runaway, validated per ST's application note AN2689.
Is SMB6F5.0AY compatible with lead-free reflow soldering processes?
Yes - SMB6F5.0AY features matte tin-plated leads qualified to J-STD-020 MSL Level 1 and supports ST's recommended reflow profile: peak temperature 240–245 °C for 60–90 seconds, with ramp rates ≤3 °C/s. It complies with IPC/JEDEC standards and passes whisker testing per JESD-201 Class 2.
SMB6F5.0AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 68A
- 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
SMB6F5.0AY FAQ
1.How can I place an order for SMB6F5.0AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F5.0AY 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 SMB6F5.0AY reliable?
The price and inventory of SMB6F5.0AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F5.0AY is usually 5 days.
3.What payment methods are accepted for SMB6F5.0AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F5.0AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F5.0AY?
SMB6F5.0AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F5.0AY 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 SMB6F5.0AY?
For technical support, including SMB6F5.0AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F5.0AY requirements.
6.How does Aetrix verify that SMB6F5.0AY is sourced from the original manufacturer or authorized distributors?
All SMB6F5.0AY 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 SMB6F5.0AY meets industry standards.
7.What is the process for return or replacement of SMB6F5.0AY?
All SMB6F5.0AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F5.0AY, 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 SMB6F5.0AY part is unused and in its original packaging.
Return procedure for SMB6F5.0AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F5.0AY Tags
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