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STMicroelectronics SMB6F22A
- Part No.:
- SMB6F22A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,212
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Product details
Overview
SMB6F22A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a standoff voltage (VRM) of 22 V, clamping voltage (VCL) of 35.5 V at 17.7 A (10/1000 µs), and operates up to 175 °C junction temperature-enabling robust protection in automotive body electronics and industrial power supplies.
For engineers reviewing the SMB6F22A datasheet, SMB6F22A pinout, SMB6F22A application, or SMB6F22A equivalent, key selection criteria include its low leakage current (0.2 µA @ 25 °C), flat SMB package with 1 mm profile, IEC 61000-4-2 ±30 kV ESD immunity, and dynamic resistance of 0.48 Ω-critical for minimizing let-through energy during fast transients.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low leakage across temperature. Its unidirectional configuration provides asymmetric clamping-forward-biased conduction only on negative transients-making it suitable for polarity-sensitive DC lines like 24 V industrial sensors or CAN bus power rails.
The device's thermal design supports continuous operation at Tj = 175 °C, with peak pulse power derating to 470 W at max junction temperature. Its low dynamic resistance (0.48 Ω) and tight VBR tolerance (24.4–27 V) ensure predictable clamping behavior under repetitive surges per IEC 61000-4-4 Level 4 (±4 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 22 V - maximum continuous reverse operating voltage before avalanche onset; defines minimum system rail margin. |
| Breakdown Voltage (VBR) | 24.4–27 V @ 1 mA - precise avalanche threshold ensuring early clamping without false triggering. |
| Clamping Voltage (VCL) | 35.5 V @ 17.7 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - energy-handling capacity sufficient for ISO 7637-2 Pulse 1/2a/5a in 24 V systems. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - negligible standby power loss and minimal impact on high-impedance sensor bias networks. |
| Junction Temperature (Tj) | −55 to +175 °C - enables deployment in under-hood automotive or industrial enclosures without derating. |
| Dynamic Resistance (RD) | 0.48 Ω - low impedance limits voltage overshoot during fast-rising transients (e.g., EFT bursts). |
Pinout & Package
The SMB6F22A is housed in an SMB Flat package (JEDEC DO-214AA), measuring 3.95 × 5.60 × 1.10 mm with a 1 mm profile optimized for space-constrained PCB layouts. The package features 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 | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference Node | Tied to system ground or lower-potential rail; completes clamping path for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Flat SMB package (1 mm height) | Enables placement beneath connectors or in stacked modules where Z-axis clearance is constrained. |
| IEC 61000-4-2 ±30 kV ESD immunity | Eliminates need for secondary ESD protection on board-level interfaces like RS-485 or LIN transceivers. |
| Low leakage (0.2 µA @ 25 °C) | Preserves accuracy in precision analog front-ends (e.g., current-sense amplifiers) without loading bias networks. |
| 175 °C max junction temperature | Supports long-term reliability in sealed enclosures with limited airflow, such as EV battery management units. |
| UL94 V0 flammability rating | Meets safety requirements for end equipment certified to IEC 62368-1 or UL 62368-1. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V PLC Input |
|---|---|
|
Use Scenario: Protecting microcontroller GPIOs and LIN transceiver power pins from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary surge clamp on 12/24 V supply rail upstream of LDO regulators. Use Value: Clamps 35.5 V at 17.7 A to prevent damage to 3.3 V/5 V logic while surviving repeated ISO 16750-2 pulses. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring transients. IC Role / Device Role / Timing Role: Front-end TVS on optocoupler input side, absorbing 4 kV IEC 61000-4-4 bursts. Use Value: Limits let-through voltage below 36 V to avoid forward-biasing internal protection diodes in isolation ICs. |
| Smart Building HVAC Sensor Node | Medical Infusion Pump Power Rail |
|
Use Scenario: Shielding RS-485 communication lines and 24 V auxiliary power in wall-mounted thermostats exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection pair (with complementary device) on differential bus lines; SMB6F22A used on VCC rail. Use Value: Maintains <0.2 µA leakage at 85 °C to preserve battery life in wireless sensor nodes with 10-year target lifespan. |
Use Scenario: Securing 24 V DC-DC converter input in Class II medical devices subject to stringent IEC 60601-1 EMC requirements. IC Role / Device Role / Timing Role: Final-stage TVS before isolated DC-DC module, suppressing conducted surges from hospital-grade mains. Use Value: UL94 V0 rating and 175 °C operation ensure compliance with flammability and thermal safety clauses in medical certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (Bourns) | Same SMB package, but higher VBR (24.4–26.9 V) and VCL (35.5 V @ 17.7 A); 600 W rating identical. | Identical clamping performance; differs only in minor VBR distribution and JEDEC registration. | Select when Bourns sourcing preference or dual-sourcing strategy requires second-source qualification. |
| P6SMB22A (Littelfuse) | Same VRM/VBR/VCL specs and SMB package; slightly higher RD (0.49 Ω vs. 0.48 Ω) and identical 600 W rating. | No functional deviation; validated for same IEC 61000-4-2/4-4 test levels. | Preferred for legacy designs qualified to P6SMB series or where Littelfuse supply chain alignment is required. |
Compared with SMBJ22A and P6SMB22A, the SMB6F22A offers identical electrical protection performance and mechanical compatibility, but distinguishes itself via ST's ECOPACK® environmental compliance, tighter VBR consistency (±5%), and documented 175 °C thermal endurance-critical for high-reliability automotive deployments.
Availability
SMB6F22A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, smart building sensor nodes, and medical infusion pump power rails requiring stable component supply across extended product lifecycles.
Supply support for SMB6F22A 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 power management, analog, and automotive-grade protection devices with broad industrial and automotive certifications.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for harsh-environment surge immunity in automotive and industrial control systems where long-term stability and temperature resilience are mandatory.
FAQ
What is the maximum clamping voltage of SMB6F22A under a 10/1000 µs surge?
The SMB6F22A clamps to 35.5 V at 17.7 A under a 10/1000 µs waveform, as specified in Table 2 of DS12898 Rev 2. This value is measured at Tamb = 25 °C and represents the peak voltage imposed on the protected circuit during standardized surge testing.
Can SMB6F22A be used in bidirectional protection configurations?
No-SMB6F22A is unidirectional and only clamps reverse-polarity transients. For bidirectional protection, two devices must be connected in series opposing configuration, or a dedicated bidirectional part like SMB6F22CA should be selected instead.
Does SMB6F22A meet automotive AEC-Q200 stress test requirements?
While not AEC-Q200 qualified, SMB6F22A meets critical automotive-relevant standards including IEC 61000-4-2 (±30 kV ESD), IEC 61000-4-4 (±4 kV EFT), and operates reliably up to 175 °C junction temperature-commonly accepted in non-safety-critical automotive modules pending system-level validation.
What is the recommended PCB footprint for SMB6F22A?
The manufacturer recommends the IPC7531-compliant footprint shown in Figure 13 of DS12898: 5.84 mm pad length, 1.20 mm pad width, 3.44 mm center-to-center spacing, and 2.07 mm pad-to-pad clearance-optimized for thermal dissipation and reflow soldering per JEDEC J-STD-020 MSL Level 1.
SMB6F22A 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):
- 22V (Max)
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 17.7A
- 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
SMB6F22A FAQ
1.How can I place an order for SMB6F22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F22A 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 SMB6F22A reliable?
The price and inventory of SMB6F22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F22A is usually 5 days.
3.What payment methods are accepted for SMB6F22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F22A?
SMB6F22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F22A 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 SMB6F22A?
For technical support, including SMB6F22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F22A requirements.
6.How does Aetrix verify that SMB6F22A is sourced from the original manufacturer or authorized distributors?
All SMB6F22A 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 SMB6F22A meets industry standards.
7.What is the process for return or replacement of SMB6F22A?
All SMB6F22A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F22A, 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 SMB6F22A part is unused and in its original packaging.
Return procedure for SMB6F22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F22A Tags
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