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STMicroelectronics SMB6F30AY
- Part No.:
- SMB6F30AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F30AY.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:8,218
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Product details
Overview
SMB6F30AY from STMicroelectronics is an AEC-Q101 qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 48.4 V (10/1000 µs) with 13 A peak pulse current and 600 W peak pulse power at 25 °C. It features 30 V stand-off voltage (VRM), 0.2 µA max leakage at 25 °C, and operates up to 175 °C junction temperature-enabling robust protection of 12 V automotive power rails against ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), and ISO 10605 ESD events.
For engineers reviewing the SMB6F30AY datasheet, SMB6F30AY pinout, SMB6F30AY application, or SMB6F30AY equivalent, this device is selected for high-reliability automotive surge suppression where low leakage, flat-profile mounting, and validated ISO 7637-2 compliance are mandatory-not generic circuit protection.
Technical Context
This TVS diode uses planar silicon technology to achieve stable clamping performance across −55 °C to +175 °C junction temperature range, with dynamic resistance (RD) of 0.885 Ω at 25 °C enabling precise voltage control during transients. Its unidirectional configuration supports DC-biased lines like battery feeds and sensor supplies without reverse conduction path concerns.
The SMB Flat package delivers 1 mm profile height and IPC7531-compliant footprint, optimized for thermal dissipation on FR4 PCBs with 70 µm copper-achieving 150 °C/W thermal resistance with minimal copper area and supporting 470 W surge capability at Tj = 175 °C (10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 30 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system operating margin for 12 V automotive rails. |
| Breakdown Voltage (VBR) | 33.2–36.8 V at 1 mA - Confirmed voltage threshold where avalanche conduction begins; ensures reliable triggering above normal rail noise. |
| Clamping Voltage (VCL) | 48.4 V at 13 A (10/1000 µs) - Maximum voltage seen by protected circuit during worst-case surge; defines downstream IC survivability limit. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustains high-energy transients per ISO 7637-2 and IEC 61000-4-4 without degradation. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low reverse leakage preserves battery drain budgets in always-on vehicle modules. |
| Junction Temperature Range | −55 °C to +175 °C - Enables under-hood placement near engines or power electronics without derating. |
| ESD Withstand | ±30 kV air/contact discharge (ISO 10605, C = 150 pF/R = 330 Ω & C = 330 pF/R = 330 Ω) - Exceeds ISO level 4 for infotainment, ADAS, and body control units. |
Pinout & Package
SMB6F30AY is housed in a surface-mount SMB Flat package (JEDEC registered MO-213AB), measuring 3.3–3.95 mm × 5.2–5.6 mm × 0.9–1.1 mm height, with matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink terminal | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return | Typically tied to chassis or battery ground; completes transient current path with minimal loop inductance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock-required for engine control, ADAS, and gateway modules. |
| Flat 1 mm profile | Enables low-profile PCB layout in space-constrained modules (e.g., radar sensors, LED drivers) without compromising thermal or surge performance. |
| Low dynamic resistance (0.885 Ω) | Minimizes clamping voltage rise under high-current surges, preserving voltage headroom for downstream 3.3 V/5 V logic and CAN transceivers. |
| High-temperature operation (Tj = 175 °C) | Supports direct placement near power MOSFETs or DC-DC converters without external heatsinking or derating. |
| ISO 7637-2 compliance | Tested to Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) - covers all major automotive load-dump and inductive-switching threats. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Camera Module Supply Rail |
|---|---|
|
Use Scenario: Protects 12 V input to microcontroller and analog front-end in under-hood ECUs exposed to alternator load dump and relay switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps negative-going pulses (Pulse 1) and positive surges (Pulse 2a/3b) before they reach LDO regulators and MCU VDD pins. Use Value: Maintains VCL ≤ 48.4 V during 13 A transients, ensuring downstream 5 V LDOs remain within absolute maximum ratings and avoid latch-up. |
Use Scenario: Shields 12 V supply to image sensor and serializer ICs in rear-view or surround-view cameras mounted near bumpers or fenders. IC Role / Device Role / Timing Role: Absorbs ESD events from cable harnesses and suppresses ISO 7637-2 Pulse 3a (−220 V) induced by nearby motor actuation. Use Value: 0.2 µA leakage prevents measurable battery drain in always-on camera systems, while 175 °C rating accommodates ambient temperatures up to 125 °C. |
| Body Control Module (BCM) LIN Bus Interface | Electric Power Steering (EPS) Motor Driver Gate Supply |
|
Use Scenario: Guards LIN transceiver VCC pin against coupled transients from adjacent 12 V loads (e.g., window motors, door locks) in BCMs. IC Role / Device Role / Timing Role: Clamps fast-rising 8/20 µs surges (IEC 61000-4-4 Level 4) to <13.4 V at 298 A, preventing LIN PHY damage without disrupting communication timing. Use Value: Low capacitance (<100 pF at 1 V) avoids signal integrity degradation on 20 kbps LIN bus, maintaining bit error rate <10⁻⁹. |
Use Scenario: Protects isolated gate driver supply (e.g., 15 V auxiliary rail) feeding high-side/low-side MOSFETs in EPS motor inverters. IC Role / Device Role / Timing Role: Diverts Pulse 1 (−150 V) energy away from gate driver ICs and bootstrap capacitors during sudden battery disconnect events. Use Value: 470 W surge capability at 175 °C allows sustained operation during repeated steering maneuvers without thermal runaway or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Same SMB package but rated for 600 W (10/1000 µs); VBR = 33.3–36.8 V, VCL = 48.4 V @ 12.3 A - slightly lower IPP and higher RD (0.95 Ω). | Lacks AEC-Q101 qualification and ISO 7637-2 validation; suitable for industrial, not automotive safety-critical use. | Select SMBJ30A only for cost-sensitive non-automotive designs where AEC-Q101 and Pulse 3a compliance are not required. |
| TPSMF30A | SOD-123FL package (1.7 × 1.25 × 0.9 mm); VBR = 33.3–36.7 V, VCL = 48.4 V @ 13 A - identical electrical specs but lower surge rating (400 W, 10/1000 µs). | Smaller footprint enables denser layouts but limits thermal mass; not validated for ISO 7637-2 Pulse 1 or Pulse 3a. | Choose TPSMF30A when board space is constrained and surge energy remains below 400 W-unsuitable for engine bay or EPS applications. |
Compared with SMBJ30A and TPSMF30A, SMB6F30AY uniquely combines AEC-Q101 qualification, full ISO 7637-2 Pulse 1/2a/3a/3b validation, and 600 W/4 kW surge capability in a thermally optimized flat package-making it the only choice for ASIL-B/C power rail protection where long-term reliability under extreme thermal and electrical stress is non-negotiable.
Availability
SMB6F30AY is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and electric power steering systems requiring stable component supply across extended temperature ranges and rigorous surge immunity.
Supply support for SMB6F30AY 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 automotive, industrial, and power management solutions with focus on functional safety and environmental compliance.
SMB6F30AY 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 power distribution networks.
FAQ
What is the maximum clamping voltage of SMB6F30AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 48.4 V at 13 A for a 10/1000 µs waveform, measured at 25 °C. This value increases with junction temperature due to the αT coefficient of 9.9 × 10⁻⁴/°C, reaching ~52.1 V at 175 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Can SMB6F30AY be used in bidirectional configurations?
No-SMB6F30AY is strictly unidirectional and must be installed with cathode toward the protected line. Bidirectional protection requires two devices in series opposition or a dedicated bidirectional TVS such as SMB6F30CA; using SMB6F30AY in reverse orientation risks permanent breakdown.
How does SMB6F30AY's thermal performance compare to standard SMB packages?
Its SMB Flat variant achieves 150 °C/W junction-to-ambient thermal resistance with minimal copper (0.5 cm² per pad), versus ~200 °C/W for legacy SMB packages-enabling 470 W surge handling at 175 °C junction temperature, critical for under-hood deployments where airflow is limited.
Is SMB6F30AY compatible with lead-free reflow soldering processes?
Yes-it features matte tin-plated leads qualified to J-STD-020 MSL Level 1 and supports ST's recommended reflow profile with peak temperature of 240–245 °C for 60 seconds (max 90 s), meeting IPC/JEDEC standards without voiding warranty or degrading surge performance.
SMB6F30AY 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):
- 30V (Max)
- Voltage - Breakdown (Min):
- 33.2V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 13A
- 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
SMB6F30AY FAQ
1.How can I place an order for SMB6F30AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F30AY 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 SMB6F30AY reliable?
The price and inventory of SMB6F30AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F30AY is usually 5 days.
3.What payment methods are accepted for SMB6F30AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F30AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F30AY?
SMB6F30AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F30AY 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 SMB6F30AY?
For technical support, including SMB6F30AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F30AY requirements.
6.How does Aetrix verify that SMB6F30AY is sourced from the original manufacturer or authorized distributors?
All SMB6F30AY 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 SMB6F30AY meets industry standards.
7.What is the process for return or replacement of SMB6F30AY?
All SMB6F30AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F30AY, 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 SMB6F30AY part is unused and in its original packaging.
Return procedure for SMB6F30AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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