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STMicroelectronics SMB6F30A
- Part No.:
- SMB6F30A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,951
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Product details
Overview
SMB6F30A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB Flat package, designed for surge protection of sensitive DC power and signal lines. It features a standoff voltage (VRM) of 30 V, clamping voltage (VCL) of 48.4 V at 13 A (10/1000 µs), junction temperature rating up to +175 °C, and low leakage current of 0.2 µA at 25 °C - enabling robust ESD and lightning surge protection in automotive body electronics and industrial I/O modules.
For engineers reviewing the SMB6F30A datasheet, SMB6F30A pinout, SMB6F30A application, or SMB6F30A equivalent, key selection criteria include its 30 V reverse standoff, 48.4 V clamping performance under 13 A surge, flat 1 mm profile for space-constrained PCB layouts, compliance with IEC 61000-4-2 level 4 (±30 kV contact/air), and UL94 V0 flammability rating - all critical for high-reliability overvoltage protection design.
Technical Context
The SMB6F30A employs planar silicon junction technology to achieve stable breakdown characteristics and low leakage across temperature. Its unidirectional configuration provides asymmetric clamping-low forward voltage drop (<3 V at 100 A peak) and precise reverse avalanche triggering at VBR = 33.2–36.8 V (min–max at 25 °C).
Thermal performance is optimized for high ambient operation: Rth(j-a) drops to ~120 °C/W with 2 cm² copper per lead, and peak pulse power remains 470 W at Tj = 175 °C (10/1000 µs), supporting sustained surge resilience in thermally demanding environments like engine control units and motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 33.2–36.8 V at 1 mA - precise avalanche initiation threshold for predictable surge response |
| Clamping Voltage (VCL) | 48.4 V at 13 A (10/1000 µs) - limits downstream voltage during surge to protect 48 V-rated ICs |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - sustains high-energy transients without failure in industrial power rails |
| Leakage Current (IRM) | 0.2 µA at 25 °C - negligible standby power loss and minimal impact on high-impedance sensor circuits |
| Junction Temperature Range | −55 to +175 °C - enables deployment in under-hood automotive and industrial enclosures |
| ESD Robustness | ±30 kV contact/air (IEC 61000-4-2 level 4) - exceeds automotive and industrial immunity requirements |
Pinout & Package
SMB6F30A is housed in an SMB Flat surface-mount package (JEDEC DO-214AA), measuring 3.95 × 5.60 × 1.10 mm with 1 mm profile height and matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature - eliminates derating in hot environments |
| Low dynamic resistance | RD = 0.885 Ω - minimizes clamping voltage rise under high-current surges (e.g., ISO 7637-2 pulses) |
| Flat ultra-thin profile | 1 mm max height - enables use in slim connectors, stacked PCBs, and tight mechanical envelopes |
| UL94 V0 flame rating | Self-extinguishing epoxy housing - meets safety requirements for automotive and industrial end equipment |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/85 % RH - eliminates bake requirements prior to reflow assembly |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 12 V/24 V CAN/LIN bus power rails and switch inputs against load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between supply rail and ground, clamping transients within 1 ns response time. Use Value: Withstands 600 W surges and maintains <0.2 µA leakage at 85 °C - ensures long-term stability in under-dash thermal zones. |
Use Scenario: Safeguarding 24 V digital input channels from field-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each optocoupler input, absorbing IEC 61000-4-4 level 4 (4 kV) fast transients. Use Value: 48.4 V clamping at 13 A prevents damage to upstream current-limiting resistors and opto-LEDs during repeated surge events. |
| Smart Meter Power Supply | Telecom Remote Terminal Unit (RTU) |
|
Use Scenario: Shielding AC/DC converter secondary-side 30 V bias rails from induced lightning surges on meter mains interface. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 30 V output, coordinated with primary-side MOV for staged protection. Use Value: 30 V VRM matches rail voltage exactly; 175 °C rating supports sealed meter enclosures with no active cooling. |
Use Scenario: Protecting RS-485 communication ports and auxiliary 24 V power inputs in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Point-of-entry TVS on each port's VCC and GND lines, meeting Telcordia GR-1089-CORE surge immunity. Use Value: ±30 kV ESD rating and 4 kW (8/20 µs) capability handle both electrostatic discharge and induced lightning surges in unshielded deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (Bourns) | Same VRM (30 V), but higher VCL = 48.9 V at 12.3 A; 600 W rating; SMB package with 2.4 mm height | Higher profile (2.4 mm vs. 1.1 mm) limits use in ultra-thin designs; identical surge specs for most industrial I/O | Select when legacy SMB footprint compatibility is required and height constraint is relaxed |
| 1.5SMC30A (ON Semiconductor) | Same VRM (30 V), VCL = 48.4 V at 12.3 A; 600 W rating; larger SMC package (7.1 × 6.2 × 2.6 mm) | Lower thermal resistance due to larger copper area, but incompatible with SMB layout; better for high-volume thermal cycling | Choose for cost-sensitive, non-space-constrained applications where board real estate allows SMC footprint |
Compared with SMBJ30A and 1.5SMC30A, SMB6F30A delivers identical 30 V standoff and 48.4 V clamping performance while offering the lowest profile (1 mm) and highest junction temperature rating (+175 °C), making it optimal for next-generation compact, high-temperature automotive and industrial modules.
Availability
SMB6F30A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and smart meter power supply surge hardening requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMB6F30A 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, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for space-constrained, high-temperature surge protection in automotive ECUs and industrial control systems where low leakage and stable clamping are mission-critical.
FAQ
What is the maximum surge current SMB6F30A can withstand?
SMB6F30A handles up to 13 A peak pulse current (IPP) under 10/1000 µs waveform at 25 °C, delivering 600 W peak power. At elevated junction temperatures (175 °C), its surge capability remains 470 W - verified per Figure 3 in DS12898 Rev 2. This makes it suitable for repetitive surge events in automotive load-dump scenarios.
Is SMB6F30A compatible with lead-free reflow soldering?
Yes - SMB6F30A is qualified for lead-free reflow per JEDEC J-STD-020 MSL Level 1, with peak reflow temperature of 240–245 °C (see Figure 20). Its matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring reliable wetting and intermetallic formation without voiding or dewetting.
How does SMB6F30A differ from bidirectional TVS diodes?
SMB6F30A is unidirectional: it clamps only in reverse bias (protecting positive-going surges on grounded-line configurations) and conducts forward like a rectifier diode. Bidirectional variants (e.g., SMB6F30AT) offer symmetrical clamping for AC lines or floating signals - but exhibit higher leakage and reduced thermal margin due to dual-junction structure.
Can SMB6F30A be used in parallel for higher surge handling?
No - paralleling discrete TVS diodes like SMB6F30A is not recommended due to mismatched VBR tolerances (±5 %), causing current imbalance and premature failure of one device. For >600 W needs, select a single higher-power device (e.g., 1500 W SMAJ30A) or implement staged protection with upstream MOVs and downstream TVS.
SMB6F30A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxA
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
SMB6F30A FAQ
1.How can I place an order for SMB6F30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F30A 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 SMB6F30A reliable?
The price and inventory of SMB6F30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F30A is usually 5 days.
3.What payment methods are accepted for SMB6F30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F30A?
SMB6F30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F30A 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 SMB6F30A?
For technical support, including SMB6F30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F30A requirements.
6.How does Aetrix verify that SMB6F30A is sourced from the original manufacturer or authorized distributors?
All SMB6F30A 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 SMB6F30A meets industry standards.
7.What is the process for return or replacement of SMB6F30A?
All SMB6F30A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F30A, 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 SMB6F30A part is unused and in its original packaging.
Return procedure for SMB6F30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F30A Tags
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