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STMicroelectronics SMB6F70AY
- Part No.:
- SMB6F70AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F70AY.pdf
- Description:
- TVS DIODE 70VWM 113VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,359
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Product details
Overview
SMB6F70AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 113 V (8/20 µs) with 5.5 A peak pulse current and 4.91 Ω dynamic resistance at 25 °C. It delivers 600 W peak pulse power (10/1000 µs), operates up to 175 °C junction temperature, and provides 70 V stand-off voltage for 12 V automotive battery systems.
For engineers reviewing the SMB6F70AY datasheet, SMB6F70AY pinout, SMB6F70AY application, or SMB6F70AY equivalent, this device is selected for ISO 7637-2 Pulse 1/2a/3a/3b surge protection, ESD immunity per ISO 10605 (±30 kV), and high-reliability engine control unit (ECU) input line protection where low leakage (0.2 µA @ 25 °C) and stable clamping under thermal stress are critical.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage current (≤1 µA @ 85 °C) and stable breakdown voltage drift coefficient (αT = 10.5 × 10−4/°C). Its unidirectional configuration enables asymmetric clamping-forward conduction during negative transients (e.g., ISO 7637-2 Pulse 1: −150 V) and reverse avalanche during positive surges (e.g., Pulse 2a: +112 V).
The SMB Flat package supports high-power dissipation (up to 470 W at Tj = 175 °C) due to optimized thermal resistance (Rth(j-a) ≈ 120 °C/W on standard FR4 footprint) and low-profile construction (1 mm height). Dynamic resistance (RD = 4.91 Ω) ensures predictable clamping voltage rise under fast-rising 8/20 µs surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system working voltage margin for 12 V automotive circuits. |
| Breakdown Voltage (VBR) | 77.9–86.1 V @ IBR = 1 mA - Confirmed avalanche onset range; defines clamping threshold under slow-rising transients. |
| Clamping Voltage (VCL) | 113 V @ IPP = 5.5 A (8/20 µs) - Maximum voltage seen by protected IC during worst-case surge; determines downstream component voltage rating. |
| Peak Pulse Power | 600 W (10/1000 µs), 146 W (8/20 µs) - Sustained energy-handling capability; validates compliance with ISO 7637-2 Pulse 3b (+150 V) and IEC 61000-4-4 Level 4. |
| Leakage Current | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Enables use in always-on automotive modules (e.g., CAN wake-up lines) without battery drain concerns. |
| Junction Temperature Range | −55 to +175 °C - Supports under-hood placement near engines and transmission control units without derating. |
| Dynamic Resistance | 4.91 Ω @ 25 °C - Quantifies VCL slope vs. IPP; used to calculate clamping voltage under custom surge profiles (VCL(max) = VBR(max) + RD × IPP(appli)). |
Pinout & Package
SMB6F70AY is housed in an SMB Flat package (JEDEC MO-213AA), measuring 3.3–3.95 mm × 5.2–5.6 mm × 0.9–1.1 mm (L × W × H), with matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink | Connected to protected line (e.g., LIN bus, sensor supply); conducts during positive transients and forward-biased negative pulses. |
| Anode | Reference node | Typically tied to ground or battery return; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control, body electronics, and ADAS sensors. |
| ISO 10605 ESD robustness | ±30 kV air/contact discharge (C = 150/330 pF, R = 330 Ω) - exceeds Level 4, eliminating need for external ESD filters in infotainment interfaces. |
| ISO 7637-2 surge immunity | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - protects CAN/LIN transceivers and microcontroller I/Os. |
| Low-profile SMB Flat package | 1 mm height - enables PCB space savings in compact ECUs and allows automated optical inspection (AOI) of solder joints. |
| High-temperature operation | 175 °C max junction temperature - maintains clamping performance in proximity to powertrain heat sources without thermal shutdown. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive LIN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rail of gasoline/diesel engine control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO regulator input to clamp ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V). Use Value: Prevents LDO destruction and MCU brown-out during cranking and ignition events; 70 V VRM ensures no conduction during normal 13.5–14.5 V charging. |
Use Scenario: Safeguarding LIN physical layer transceivers (e.g., TLE7259) against ESD and coupled transients on vehicle wiring harnesses. IC Role / Device Role / Timing Role: TVS connected between LIN line and ground to suppress ISO 10605 ±30 kV discharges and ISO 7637-2 Pulse 2a (+112 V) induced surges. Use Value: Maintains LIN signal integrity below 20.5 kbps; 113 V VCL keeps transceiver within absolute maximum ratings during surge events. |
| Body Control Module (BCM) Sensor Inputs | ADAS Camera Power Line Protection |
|
Use Scenario: Shielding analog sensor inputs (e.g., ambient temperature, humidity) in BCMs from harness-induced transients during door slam or relay switching. IC Role / Device Role / Timing Role: TVS installed at connector entry point to shunt sub-100 ns ESD events and longer 10/1000 µs surges before reaching ADC front-end. Use Value: 0.2 µA leakage prevents DC offset errors in precision ratiometric sensors; 175 °C rating supports placement near HVAC actuators. |
Use Scenario: Securing 5 V/3.3 V power rails feeding CMOS image sensors and SerDes links in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: TVS deployed upstream of DC-DC converter to absorb ISO 7637-2 Pulse 3a (−220 V) from long cable runs exposed to chassis ground bounce. Use Value: 470 W power handling at 175 °C ensures no thermal runaway during repeated hot-cranking cycles; flat package minimizes board area in tight camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | VRM = 70 V, VCL = 113 V @ 5.5 A (8/20 µs), but rated only to 150 °C Tj and not AEC-Q101 qualified. | Lacks automotive qualification and high-temperature derating capability; suitable for industrial-grade non-safety-critical modules. | Select when cost sensitivity outweighs under-hood reliability requirements and thermal margin is >25 °C. |
| SMCJ70A | Same VRM/VCL, but in larger SMC package (2.6 mm height); 1500 W (10/1000 µs) rating and 175 °C Tj support. | Higher power handling suits 24 V commercial vehicle systems; footprint incompatible with SMB-restricted PCB layouts. | Choose for heavy-duty truck ECUs needing higher surge margin, provided board space allows SMC footprint. |
Compared with SMBJ70A, SMB6F70AY offers verified automotive qualification and extended thermal operation, while SMCJ70A trades compactness for greater surge headroom-making SMB6F70AY optimal for space-constrained, high-reliability 12 V automotive nodes.
Availability
SMB6F70AY is available at Aetrix Electronics and suitable for engine control units, LIN bus interfaces, body control modules, and ADAS camera power lines requiring stable component supply across automotive production lifecycles.
Supply support for SMB6F70AY 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.
SMB6F70AY belongs to the SMB6FxxAY series-a family of AEC-Q101-qualified unidirectional TVS diodes engineered specifically for ISO 7637-2 and ISO 10605 compliance in automotive electronic control units and sensor interfaces.
FAQ
What is the maximum clamping voltage of SMB6F70AY under an 8/20 µs surge?
The maximum clamping voltage is 113 V at 5.5 A peak pulse current for an 8/20 µs waveform, measured at 25 °C. This value increases with junction temperature at a rate defined by αT = 10.5 × 10−4/°C, reaching approximately 122 V at 125 °C per the VCL vs. Tj formula in DS12412.
Is SMB6F70AY compatible with lead-free reflow soldering processes?
Yes, SMB6F70AY is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a maximum peak temperature of 240–245 °C for 60 seconds (max 90 s). The recommended profile includes ramp rates ≤3 °C/s and cooling ≥2 °C/s, matching ST's ECOPACK® guidelines in DS12412.
How does SMB6F70AY differ from bidirectional TVS diodes in automotive applications?
SMB6F70AY is unidirectional, meaning it conducts only during positive surges relative to ground and forward-biased negative transients-ideal for DC-powered lines like battery feeds and LIN buses. Bidirectional variants (e.g., SMB6F70CA) would conduct on both polarities, increasing leakage and reducing noise immunity in single-supply systems.
Can SMB6F70AY be used in 24 V commercial vehicle systems?
No-its 70 V stand-off voltage is optimized for 12 V nominal automotive systems. In 24 V applications, sustained voltages may exceed VRM, causing excessive leakage or premature failure. For 24 V, select SMB6F130AY (VRM = 130 V) or SMCJ130A with appropriate derating.
SMB6F70AY 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):
- 70V
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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
SMB6F70AY FAQ
1.How can I place an order for SMB6F70AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F70AY 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 SMB6F70AY reliable?
The price and inventory of SMB6F70AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F70AY is usually 5 days.
3.What payment methods are accepted for SMB6F70AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F70AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F70AY?
SMB6F70AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F70AY 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 SMB6F70AY?
For technical support, including SMB6F70AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F70AY requirements.
6.How does Aetrix verify that SMB6F70AY is sourced from the original manufacturer or authorized distributors?
All SMB6F70AY 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 SMB6F70AY meets industry standards.
7.What is the process for return or replacement of SMB6F70AY?
All SMB6F70AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F70AY, 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 SMB6F70AY part is unused and in its original packaging.
Return procedure for SMB6F70AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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