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STMicroelectronics SMB6F6.5AY
- Part No.:
- SMB6F6.5AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F6.5AY.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
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Product details
Overview
SMB6F6.5AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 11.2 V (at 56 A, 10/1000 µs), with stand-off voltage of 6.5 V, peak pulse power of 600 W (10/1000 µs), and operating junction temperature up to +175 °C for engine bay and powertrain ECU protection.
For engineers reviewing the SMB6F6.5AY datasheet, SMB6F6.5AY pinout, SMB6F6.5AY application, or SMB6F6.5AY equivalent, key selection criteria include clamping voltage at rated surge current, leakage current at elevated temperature, ISO 7637-2 pulse immunity (Pulse 1, 2a, 3a/b), and flat 1 mm profile for space-constrained PCB layouts in automotive electronics.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (≤0.2 µA at 25 °C, ≤1 µA at 85 °C) and stable breakdown behavior across –55 °C to +175 °C junction temperature range. Its unidirectional configuration provides reverse-biased surge suppression only, making it suitable for DC supply rail protection where forward conduction is not required.
The device complies with IEC 61000-4-2 (±30 kV air/contact ESD), ISO 10605 (±30 kV), and ISO 7637-2 (Pulse 1: –150 V; Pulse 2a: +112 V; Pulse 3a: –220 V; Pulse 3b: +150 V), with dynamic resistance of 0.057 Ω enabling precise clamping under high-current transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 6.5 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system supply margin. |
| Breakdown Voltage (VBR) | 7.2–8.0 V at 10 mA - Confirmed voltage range where device transitions from high-impedance to clamping state. |
| Clamping Voltage (VCL) | 11.2 V at 56 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; critical for IC survivability. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability at ambient temperature; derates to 470 W at Tj = 175 °C. |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C, ≤1 µA at 85 °C - Ensures minimal standby power loss and signal integrity in always-on automotive modules. |
| Dynamic Resistance (RD) | 0.057 Ω - Low impedance during clamping ensures tight voltage control and reduced overshoot under fast transients. |
| Junction Temperature Range | –55 °C to +175 °C - Enables direct placement near high-heat sources (e.g., ignition drivers, motor controllers). |
Pinout & Package
SMB6F6.5AY is housed in an SMB Flat package (JEDEC MO-213AA), measuring 3.95 mm × 5.60 mm × 1.10 mm (L × W × H), 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 thermal relief on compact automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Current Sink | Connected to protected line (e.g., 12 V rail); conducts transient energy to ground during overvoltage events. |
| Anode | Reference / Ground Return | Typically tied to chassis or system ground; completes clamping path with minimal inductance for effective ISO 7637-2 suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Flat 1 mm profile | Enables placement under connectors or near heat-generating components without mechanical interference or airflow obstruction. |
| Low dynamic resistance (0.057 Ω) | Reduces clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 3b), improving downstream IC survival rate. |
| High-temperature leakage stability | ≤1 µA at 85 °C ensures no measurable current draw in battery-sensitive applications like telematics sleep mode. |
| ISO 7637-2 compliance | Rated for Pulse 1 (–150 V), Pulse 2a (+112 V), Pulse 3a (–220 V), and Pulse 3b (+150 V) - covers full automotive load dump and inductive switching threats. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Lines |
|---|---|
|
Use Scenario: 12 V battery feed to microcontroller power domain exposed to load dump and alternator ripple. IC Role / Device Role: Primary overvoltage clamp on main VDD rail, placed upstream of LDO regulators. Use Value: Limits transient voltage to ≤11.2 V during ISO 7637-2 Pulse 1 (–150 V), preventing regulator latch-up or MCU brownout. |
Use Scenario: Protection of high-speed CAN FD transceivers against ESD and coupled transients on vehicle wiring harnesses. IC Role / Device Role: Secondary-level TVS on CAN_H/CAN_L differential pair, supplementing internal transceiver ESD cells. Use Value: Clamps ±30 kV ESD (IEC 61000-4-2) and ISO 7637-2 Pulse 3a/b without degrading signal integrity due to low capacitance (<100 pF @ 1 V). |
| Electric Power Steering (EPS) Motor Driver | ADAS Camera Power Supply |
|
Use Scenario: 12 V input to half-bridge gate driver IC subjected to inductive kickback from brushed DC motor commutation. IC Role / Device Role: Fast-response surge suppressor parallel to bulk input capacitor, absorbing energy before it reaches driver IC. Use Value: Withstands 4 kW (8/20 µs) surges and maintains <0.057 Ω dynamic resistance to minimize voltage overshoot during rapid current rise. |
Use Scenario: Always-on 5 V rail powering image sensor and ISP in rear-view camera module, requiring ultra-low leakage and thermal stability. IC Role / Device Role: Standby-mode TVS on regulated output, selected for ≤1 µA leakage at 85 °C to avoid battery drain. Use Value: Enables 10+ year field life in sealed enclosures by eliminating thermal runaway risk and maintaining clamping performance at Tj = 175 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.5A | Same SMB package, but lower PPP (600 W vs. SMB6F6.5AY's 600 W at 25 °C; SMBJ6.5A derates faster above 85 °C). | Not AEC-Q101 qualified; lacks ISO 7637-2 Pulse 3a/b validation and 175 °C Tj rating. | Acceptable for non-automotive industrial use where AEC-Q101 and extended temperature are not required. |
| SMCJ6.5A | Higher PPP (1500 W), larger SMC package (7.11 mm × 6.22 mm × 2.34 mm), higher clamping voltage (11.7 V at 103 A). | Used where higher surge margin is needed, but incompatible with space-constrained SMB footprints and reflow profiles. | Choose only when board layout allows SMC footprint and system requires >1 kW surge handling beyond ISO 7637-2 scope. |
Compared with SMBJ6.5A and SMCJ6.5A, SMB6F6.5AY uniquely balances AEC-Q101 compliance, 1 mm flat profile, 175 °C operation, and validated ISO 7637-2 immunity-making it the only option for next-gen automotive ECUs with strict size and thermal constraints.
Availability
SMB6F6.5AY is available at Aetrix Electronics and suitable for engine control units, body control modules, electric power steering systems, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.
Supply support for SMB6F6.5AY 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.
SMB6F6.5AY belongs to the SMB6FxxAY automotive TVS series, engineered specifically for robust transient suppression in harsh-temperature vehicle environments-targeting ECU, BCM, EPS, and ADAS subsystems demanding AEC-Q101 reliability and ISO 7637-2 compliance.
FAQ
What is the maximum clamping voltage of SMB6F6.5AY under ISO 7637-2 Pulse 1 conditions?
The SMB6F6.5AY clamps to ≤11.2 V at 56 A (10/1000 µs waveform), which directly applies to ISO 7637-2 Pulse 1 (–150 V, 50 Ω source). Its low dynamic resistance (0.057 Ω) ensures minimal voltage overshoot during the initial 10 µs rise time, protecting downstream LDOs and MCUs from destructive overvoltage.
Does SMB6F6.5AY support reflow soldering per J-STD-020?
Yes-SMB6F6.5AY is rated MSL Level 1 and qualified for lead-free reflow per ST's recommended profile: peak temperature 240–245 °C, ramp rate ≤3 °C/s, and time above 217 °C limited to 60–90 seconds. Its matte tin plating meets JESD 22-B102 E3 and MIL-STD-750 Method 2026 solderability standards.
How does SMB6F6.5AY perform at elevated junction temperatures?
At Tj = 175 °C, SMB6F6.5AY maintains ≤1 µA leakage current and delivers up to 470 W peak pulse power (10/1000 µs), retaining 78% of its room-temperature rating. Its temperature coefficient αT = 6.1 × 10⁻⁴ /°C enables accurate VBR and VCL prediction across the full –55 °C to +175 °C operating range.
Can SMB6F6.5AY be used on bidirectional signal lines like LIN or CAN?
No-SMB6F6.5AY is unidirectional and intended for DC power rail protection only. For bidirectional data lines such as LIN or CAN, a bidirectional TVS (e.g., SMB6F6.5CA) or dedicated data-line protector with symmetric clamping is required to avoid forward conduction during normal signal swing.
SMB6F6.5AY 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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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
SMB6F6.5AY FAQ
1.How can I place an order for SMB6F6.5AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F6.5AY 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 SMB6F6.5AY reliable?
The price and inventory of SMB6F6.5AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F6.5AY is usually 5 days.
3.What payment methods are accepted for SMB6F6.5AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F6.5AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F6.5AY?
SMB6F6.5AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F6.5AY 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 SMB6F6.5AY?
For technical support, including SMB6F6.5AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F6.5AY requirements.
6.How does Aetrix verify that SMB6F6.5AY is sourced from the original manufacturer or authorized distributors?
All SMB6F6.5AY 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 SMB6F6.5AY meets industry standards.
7.What is the process for return or replacement of SMB6F6.5AY?
All SMB6F6.5AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F6.5AY, 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 SMB6F6.5AY part is unused and in its original packaging.
Return procedure for SMB6F6.5AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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