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Taiwan Semiconductor Corporation SMBJ22C
- Part No.:
- SMBJ22C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22C.pdf
- Description:
- 600W, 27.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,920
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Product details
Overview
SMBJ22C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR @ 1mA), and clamps transients to ≤39.4V at 15A peak pulse current (IPP), making it suitable for protecting 24V DC systems against ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMBJ22C datasheet, SMBJ22C pinout, SMBJ22C application, or SMBJ22C equivalent, key selection criteria include clamping voltage vs. system overvoltage margin, leakage current at operating voltage, thermal derating above 25°C, and compliance with automotive EFT and load-dump immunity standards.
Technical Context
The SMBJ22C employs a glass-passivated silicon junction optimized for fast response (<1.0 ps) and low capacitance, enabling effective suppression of electrical fast transients (EFT) and inductive switching spikes without signal distortion. Its unidirectional configuration provides forward conduction capability while blocking reverse leakage below 1μA at 22V.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting reliable operation up to TJ = 150°C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring robustness in automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for 24V nominal circuits. |
| VBR min/max | 24.4 V / 29.8 V @ 1 mA - Confirmed breakdown range ensures consistent turn-on across production lots under standardized test conditions. |
| VC @ IPP | 39.4 V @ 15 A - Clamping voltage during 10/1000 µs surge defines worst-case overvoltage seen by protected ICs or MOSFETs. |
| PPK | 600 W - Peak pulse power rating determines survivability against single-event transients per ISO 7637-2. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and avoids false triggering in always-on 24V monitoring circuits. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive environments with minimal heatsinking. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connects to system ground or low-side return in unidirectional configuration; carries full surge current during clamping. |
| Cathode | Reverse-biased terminal | Connected to protected line (e.g., 24V rail); blocks normal operation but avalanches during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio VC/VBR | ≤1.62 - Low ratio ensures tight overvoltage control relative to breakdown threshold, critical for modern low-voltage tolerant ICs. |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and EFT pulses before sensitive circuitry responds. |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive load-dump and supply transients, eliminating need for additional qualification testing. |
| Moisture sensitivity | Level 1 (J-STD-020) - Allows indefinite floor life before reflow, simplifying inventory management and production scheduling. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V CAN bus power lines and microcontroller supply inputs in engine control units against load-dump surges and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24V rail and chassis ground to shunt transient energy away from downstream regulators and communication ICs. Use Value: Limits peak voltage to 39.4V during 15A ISO 7637-2 Pulse 5a events, preventing latch-up or gate oxide damage in 3.3V/5V logic devices. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Standoff protection on 24V dry-contact inputs to absorb repetitive 100ns–1µs switching transients without degradation. Use Value: Sub-1µA leakage at 22V prevents false triggering in high-impedance sensing circuits, while 600W PPK handles worst-case coil de-energization spikes. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Protection |
Use Scenario: Securing constant-current LED drivers in commercial lighting systems subjected to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the 24V/48V input stage, coordinated with upstream fusing to clear sustained faults. Use Value: 39.4V clamping voltage ensures driver ICs remain within absolute maximum ratings even during 10/1000µs 600W transients. |
Use Scenario: Front-end protection for buck converters powering FPGA or ASIC core supplies in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Fast-acting TVS placed ahead of input EMI filter and bulk capacitor to prevent voltage overshoot from propagating into switching regulator ICs. Use Value: 10°C/W junction-to-case thermal resistance supports stable clamping performance during repeated surge events in thermally constrained board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ22CA | Bidirectional variant with same VWM (22V), slightly higher VC (41.5V @ 15A), identical DO-214AC (SMA) package footprint but smaller thermal mass. | Requires polarity-insensitive placement; less suitable for DC-coupled unidirectional rails where forward conduction must be preserved. | Select SMBJ22C when unidirectional clamping and higher thermal robustness (RθJA = 55°C/W vs. SMAJ's 65°C/W) are required for 24V automotive power domains. |
| Vishay SMF22A | Lower PPK (200W), same VWM (22V), lower IPP (5.5A), DO-214AB (SMA) package with reduced power handling and thermal capacity. | Only appropriate for low-energy ESD/EFT protection; insufficient for ISO 7637-2 load-dump or inductive switching events. | Choose SMBJ22C for applications demanding full 600W surge immunity-SMF22A is a cost-optimized alternative only for non-automotive, low-risk signal-line protection. |
Compared with SMAJ22CA and SMF22A, SMBJ22C delivers superior thermal resilience and higher surge current capacity in the larger DO-214AA (SMB) package, making it the preferred choice for 24V DC power rail protection where sustained clamping reliability and automotive-grade compliance are mandatory.
Availability
SMBJ22C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O safeguarding, LED driver overvoltage clamping, and DC-DC converter input protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ22C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for automotive and industrial markets.
The SMBJ series was engineered specifically for high-reliability transient suppression in harsh-environment 12V/24V/48V systems, emphasizing ISO 7637-2 compliance, low leakage, and robust thermal performance in surface-mount packages.
FAQ
What is the polarity configuration of SMBJ22C?
SMBJ22C is a unidirectional TVS diode, meaning it conducts in the forward direction like a standard diode and clamps reverse overvoltages above its breakdown threshold. The cathode band marks the terminal that connects to the protected line (e.g., 24V rail), while the anode connects to ground. This configuration ensures low leakage during normal operation and precise clamping behavior during transients, distinguishing it from bidirectional variants like SMBJ22CA.
Does SMBJ22C meet automotive transient immunity standards?
Yes, SMBJ22C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, covering common automotive electrical disturbances including battery disconnect, load dump, and coupled EFT. Its 600W peak pulse power rating, 39.4V clamping voltage at 15A, and thermal design enable reliable operation in engine control units, body control modules, and other under-hood applications where compliance with OEM-level surge specifications is mandatory.
What is the maximum clamping voltage for SMBJ22C under surge conditions?
The maximum clamping voltage (VC) for SMBJ22C is 39.4V at a peak pulse current (IPP) of 15A using the standard 10/1000µs waveform. This value represents the worst-case voltage imposed on protected circuitry during a full-rated surge event and is measured across the device terminals under controlled test conditions. Designers must ensure downstream components have sufficient voltage margin above this clamping level to avoid overstress.
How does SMBJ22C compare to SMBJ22A in terms of breakdown voltage?
SMBJ22C has a breakdown voltage (VBR) range of 24.4–29.8V at 1mA test current, whereas SMBJ22A specifies 24.4–26.9V. The broader VBR window of SMBJ22C reflects tighter process control for unidirectional devices and ensures more predictable turn-on behavior across temperature and aging. Both share identical VWM (22V), VC (39.4V), and package (DO-214AA), but SMBJ22C is preferred when consistent clamping onset is critical for system-level fault tolerance.
Is SMBJ22C suitable for high-humidity or lead-free reflow environments?
Yes, SMBJ22C is qualified to J-STD-020 Moisture Sensitivity Level 1, allowing unlimited floor life before reflow, and features matte tin-plated leads compliant with J-STD-002 solderability standards for both SnPb and lead-free processes. Its UL 94V-0 molding compound and JESD201 Class 2 whisker resistance further ensure long-term reliability in humid industrial enclosures and automated SMT assembly lines using Pb-free solder profiles up to 260°C peak temperature.
SMBJ22C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 15A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ22C FAQ
1.How can I place an order for SMBJ22C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22C 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 SMBJ22C reliable?
The price and inventory of SMBJ22C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22C is usually 5 days.
3.What payment methods are accepted for SMBJ22C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22C?
SMBJ22C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22C 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 SMBJ22C?
For technical support, including SMBJ22C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22C requirements.
6.How does Aetrix verify that SMBJ22C is sourced from the original manufacturer or authorized distributors?
All SMBJ22C 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 SMBJ22C meets industry standards.
7.What is the process for return or replacement of SMBJ22C?
All SMBJ22C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22C, 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 SMBJ22C part is unused and in its original packaging.
Return procedure for SMBJ22C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22C Tags
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