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STMicroelectronics SMB6F188A
- Part No.:
- SMB6F188A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F188A.pdf
- Description:
- TVS DIODE 188VWM 328VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,056
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Product details
Overview
SMB6F188A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB Flat package, designed for high-reliability surge protection of sensitive electronics. It features a standoff voltage (VRM) of 188 V, clamping voltage (VCL) of 328 V at 48.5 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for industrial power supply input stages and telecom line interfaces.
For engineers reviewing the SMB6F188A datasheet, SMB6F188A pinout, SMB6F188A application, or SMB6F188A equivalent, key selection criteria include peak pulse power (600 W @ 10/1000 µs), low leakage (0.2 µA @ 25 °C), flat 1 mm profile, IEC 61000-4-2 ±30 kV ESD robustness, and compatibility with high-temperature PCB layouts requiring long-term stability.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (RD = 15.2 Ω) and stable clamping performance across temperature (αT = 10.8 × 10⁻⁴ /°C). Its unidirectional configuration enables asymmetric surge handling-blocking reverse voltage up to 188 V while clamping positive transients to 328 V at 48.5 A.
The device meets IEC 61000-4-4 Level 4 (±4 kV) and exceeds IEC 61000-4-2 Level 4 for both air and contact discharge (±30 kV). Its SMB Flat package supports IPC7531-compliant footprint and achieves thermal resistance of ≤4.5 °C/W on FR4 with optimized copper area under leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 188 V - Maximum continuous reverse operating voltage before breakdown |
| Clamping Voltage (VCL) | 328 V at 48.5 A (10/1000 µs) - Peak voltage seen by protected circuit during surge |
| Peak Pulse Power | 600 W (10/1000 µs) - Sustains short-duration surges without failure |
| Leakage Current | 0.2 µA @ 25 °C - Minimal DC loading on high-impedance signal/power rails |
| Junction Temperature | −55 to +175 °C - Enables operation in harsh environments like industrial motor drives |
| Dynamic Resistance | 15.2 Ω - Determines voltage rise per ampere of surge current (ΔV = RD × ΔI) |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Full immunity to human-body-model ESD events |
Pinout & Package
SMB6F188A 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 height, with matte tin-plated leads compliant to J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge current sink | Connected to ground or low-impedance return path; conducts during positive transients |
| Anode | Protected line connection | Connected to input rail (e.g., 188 V DC bus); blocks reverse voltage up to VRM |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation at Tj = 175 °C - eliminates derating in compact, thermally constrained designs |
| Low-profile mounting | 1 mm max height - fits under low-clearance shields and enables dense board layouts |
| Stable clamping over temperature | Temperature coefficient αT = 10.8 × 10⁻⁴ /°C - ensures predictable VCL drift across full operating range |
| Robust solderability | MSL Level 1, 260 °C lead temperature tolerance - compatible with standard reflow profiles without preconditioning |
| ESD-hardened construction | Passes ±30 kV contact/air discharge - protects against field-induced failures in unshielded enclosures |
Applications
| Industrial AC/DC Power Input | Telecom Line Interface |
|---|---|
Use Scenario: Protection of rectified 180–200 V DC bus against lightning-induced surges and switching transients in DIN-rail power supplies. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between DC+ and chassis ground, absorbing energy before it reaches downstream regulators. Use Value: Clamps to 328 V at 48.5 A, limiting stress on 400 V-rated electrolytic capacitors and MOSFETs while maintaining >188 V operational margin. | Use Scenario: Surge protection on primary-side Ethernet PHY lines or analog telephony (POTS) interface circuits exposed to induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected in series with line transformer secondary, shunting fast transients before they couple into sensitive receiver front-ends. Use Value: With 0.2 µA leakage at 25 °C and <1 µA at 85 °C, avoids signal distortion or bias shift in high-impedance analog paths. |
| Motor Drive DC Link | Renewable Energy Inverter Input |
Use Scenario: Protection of IGBT gate drivers and DC-link sensing circuits in variable-frequency drives subjected to regenerative braking spikes. IC Role / Device Role / Timing Role: TVS mounted directly at DC-link capacitor terminals, clamping repetitive 1–10 µs transients generated by fast-switching SiC modules. Use Value: 600 W peak power rating and 15.2 Ω dynamic resistance ensure consistent clamping even after repeated 40 A surges at 175 °C junction temperature. | Use Scenario: Input-stage protection for solar PV string combiners rated for 1000 V DC, where partial shading or arc faults generate high-voltage transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across PV+ and ground to suppress common-mode surges induced by nearby lightning strikes. Use Value: 188 V VRM aligns with system-level insulation coordination; 328 V VCL ensures compatibility with 600 V-rated isolation amplifiers and MCU ADC inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188A (Bourns) | Same VRM (188 V), but lower peak power (600 W vs. SMB6F188A's 600 W), higher VCL (340 V @ 48.5 A), and larger SMB package height (2.29 mm vs. 1.1 mm) | Less suitable for ultra-low-profile designs; higher clamping increases stress on downstream components | Select when legacy footprint compatibility outweighs height constraints |
| P6SMB188A (ON Semiconductor) | Identical VRM and VCL specs, but rated only to 150 °C Tj (vs. 175 °C), and higher leakage (1 µA @ 25 °C) | Not recommended for extended-life deployments in high-ambient-temperature enclosures (>85 °C ambient) | Choose only for cost-sensitive, non-critical applications with controlled thermal environment |
Compared with SMBJ188A and P6SMB188A, SMB6F188A delivers superior thermal endurance (175 °C), lower profile (1 mm), and tighter clamping (328 V), making it optimal for space-constrained, high-reliability industrial inverters and telecom infrastructure where long-term parametric stability is critical.
Availability
SMB6F188A is available at Aetrix Electronics and suitable for industrial AC/DC power input, telecom line interface, and renewable energy inverter input applications requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for SMB6F188A 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 innovative solutions across automotive, industrial, power, and smart mobility markets.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for demanding surge protection in industrial power systems where long-term stability, high-temperature operation, and low-leakage performance are mandatory.
FAQ
What is the maximum surge current SMB6F188A can handle at 10/1000 µs?
SMB6F188A sustains a peak pulse current of 48.5 A under 10/1000 µs waveform conditions, corresponding to its 600 W peak pulse power rating at 25 °C ambient. At elevated junction temperatures up to 175 °C, its derated capability remains at 470 W, supporting reliable operation in thermally stressed environments.
Does SMB6F188A meet IEC 61000-4-5 requirements?
SMB6F188A is not rated to IEC 61000-4-5 (surge immunity) directly, as that standard applies to system-level testing. However, its 600 W (10/1000 µs) and 4 kW (8/20 µs) pulse power ratings, combined with 328 V clamping, enable compliant design when used with appropriate series impedance in accordance with IEC 61000-4-5 test waveforms.
Can SMB6F188A be used in bidirectional configurations?
No-SMB6F188A is strictly unidirectional. Its electrical characteristics (e.g., VBR min = 209 V, VRM = 188 V) and marking (single cathode band) confirm asymmetrical behavior. For bidirectional protection, ST offers the SMB6F188CA variant, which provides symmetrical clamping for AC-coupled or floating-line applications.
What is the recommended PCB footprint for SMB6F188A?
The manufacturer specifies an IPC7531-compliant footprint: pad length 3.44 mm (0.136″), pad width 1.20 mm (0.047″), center-to-center spacing 5.84 mm (0.230″), with 2.07 mm (0.082″) solder mask opening. Copper area ≥1 cm² per lead reduces Rth(j-a) to ≤4.5 °C/W, critical for sustained surge duty cycles.
SMB6F188A 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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 2A
- 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
SMB6F188A FAQ
1.How can I place an order for SMB6F188A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F188A 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 SMB6F188A reliable?
The price and inventory of SMB6F188A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F188A is usually 5 days.
3.What payment methods are accepted for SMB6F188A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F188A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F188A?
SMB6F188A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F188A 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 SMB6F188A?
For technical support, including SMB6F188A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F188A requirements.
6.How does Aetrix verify that SMB6F188A is sourced from the original manufacturer or authorized distributors?
All SMB6F188A 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 SMB6F188A meets industry standards.
7.What is the process for return or replacement of SMB6F188A?
All SMB6F188A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F188A, 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 SMB6F188A part is unused and in its original packaging.
Return procedure for SMB6F188A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F188A Tags
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