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Taiwan Semiconductor Corporation SMBJ22
- Part No.:
- SMBJ22
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22.pdf
- Description:
- 600W, 27.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
SMBJ22 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 DC power rails and signal lines. It features a 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR @ 1mA), 39.4V maximum clamping voltage (VC) at 15A peak pulse current, and <1μA leakage above 22V - ideal for automotive load-dump and ESD-sensitive industrial control interfaces.
For engineers reviewing the SMBJ22 datasheet, SMBJ22 pinout, SMBJ22 application, or SMBJ22 equivalent, key selection criteria include clamping performance under 10/1000µs surges, thermal derating above 25°C ambient, unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The SMBJ22 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0ps) to fast transients while maintaining low leakage. Its unidirectional configuration provides forward conduction capability up to 100A IFSM (8.3ms half-sine) and 3.5V VF at 50A, supporting inductive switching protection in power supply outputs.
Thermally, it delivers RθJA = 55°C/W and RθJC = 10°C/W, allowing sustained 3W steady-state dissipation at 25°C ambient. The device is rated for -55°C to +150°C junction temperature and meets J-STD-020 moisture sensitivity level 1, ensuring compatibility with standard reflow profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets minimum system operating margin before protection activates. |
| VBR min/max | 24.4 V / 29.8 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering across process variation and temperature. |
| VC @ IPP | 39.4 V @ 15 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; defines maximum stress on downstream ICs. |
| PPK | 600 W - Non-repetitive peak pulse power handling; supports single-event automotive load dump per ISO 7637-2. |
| ID @ VWM | <1 µA - Ultra-low leakage at rated stand-off; prevents measurable power loss or bias shift in high-impedance sensing circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive or enclosed industrial enclosures. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and IPC-7351B footprint. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on one end. Weight ≈ 0.090 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential rail; forms return path during clamping; must be routed with low-inductance trace. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V supply); marked by band; carries full surge current into anode during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping speed | <1.0 ps response - Enables protection of high-speed digital interfaces (e.g., CAN FD, RS-485) against EFT bursts without signal distortion. |
| Glass passivation | Junction stability over 1000+ thermal cycles - Ensures long-term reliability in automotive engine-control units exposed to repeated thermal shock. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) - Meets OEM-level EMC requirements without external filtering. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - Supports green manufacturing and end-of-life recycling mandates. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 24V battery-fed ECUs subjected to load-dump transients up to 40V for 400ms per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping excess energy before it reaches LDOs and microcontrollers. Use Value: Limits peak voltage to ≤39.4V during 15A surge, preventing latch-up or gate oxide damage in 3.3V/5V logic supplies. |
Use Scenario: Digital input modules receiving 24V dry-contact signals in factory automation cabinets with high EMI exposure. IC Role / Device Role / Timing Role: Front-end transient suppressor on each channel, mounted directly at connector entry point. Use Value: Absorbs 600W pulses from relay coil flyback or nearby motor switching, eliminating false triggering in optocoupler-isolated inputs. |
| LED Driver Output Protection | RS-485 Transceiver Line Protection |
Use Scenario: Constant-current LED drivers powering streetlight arrays where lightning-induced surges propagate through long cable runs. IC Role / Device Role / Timing Role: Output-side TVS across driver output terminals, shunting surge energy away from MOSFET switches and current-sense resistors. Use Value: Clamps 10/1000µs surges to 39.4V, keeping drain-source voltage within safe SOA limits of 60V-rated power FETs. |
Use Scenario: Industrial RS-485 nodes deployed in electrically noisy environments (e.g., near VFDs or welding equipment). IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMBJ22 used in unidirectional configuration on VCC-to-GND rail feeding transceiver, complementing line-side TVS. Use Value: Prevents power-rail collapse during EFT bursts, maintaining stable bias for MAX13487-level transceivers during multi-kV coupling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Narrower VBR range (24.4–26.9 V vs. 24.4–29.8 V); lower clamping voltage (35.5 V @ 17.7 A) | Better precision for tightly regulated 24V systems where tighter VBR tolerance reduces false triggering risk | Select SMBJ22A when system VWM margin is narrow and clamping headroom must be minimized without sacrificing PPK rating |
| SMBJ24 | Higher VWM (24 V), higher VBR (26.7–32.6 V), higher VC (43.0 V @ 14.6 A) | Preferred for 28V aerospace or telecom systems where higher stand-off avoids nuisance clamping during normal transients | Choose SMBJ24 if nominal rail is ≥26V and surge immunity must coexist with >2V overhead above steady-state voltage |
Compared with SMBJ22, SMBJ22A offers tighter VBR control and lower clamping for precision 24V rails, while SMBJ24 provides greater stand-off margin for higher-voltage systems - both retain identical DO-214AA packaging and 600W PPK rating but differ in voltage thresholds critical for system-level surge margin allocation.
Availability
SMBJ22 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, LED lighting drivers, and RS-485 communication systems requiring stable component supply and ISO 7637-2 compliance.
Supply support for SMBJ22 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 devices since 1979.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust clamping consistency, AEC-Q101 readiness, and compatibility with automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ22 under standard 10/1000µs surge conditions?
The SMBJ22 has a maximum clamping voltage (VC) of 39.4 V when subjected to a 15 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the highest voltage the protected circuit will experience during such a transient - critical for verifying downstream IC voltage tolerances. The SMBJ22 maintains this clamping performance across its full operating temperature range.
Is SMBJ22 suitable for bidirectional transient protection?
No, SMBJ22 is a unidirectional TVS diode intended for DC power rail or single-polarity signal line protection. For bidirectional applications (e.g., AC lines or data buses like USB), a bipolar variant such as SMBJ22C or SMBJ22CA must be used. The SMBJ22 has a cathode band marking and conducts only in reverse breakdown - forward conduction is limited to 3.5 V at 50 A, not designed for symmetrical clamping.
What is the leakage current specification for SMBJ22 at its rated working voltage?
At its 22 V working stand-off voltage (VWM), the SMBJ22 exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C ambient. This ultra-low leakage ensures minimal power loss in always-on systems and avoids loading high-impedance sensor references or battery-backed circuits - a key advantage over older TVS families with µA-to-mA leakage ranges.
Does SMBJ22 meet automotive EMC standards out of the box?
Yes, the SMBJ22 is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b - covering load-dump, supply interruption, and electrical fast transients common in 12V/24V vehicle networks. No additional filtering or layout modifications are required to pass these tests when the SMBJ22 is correctly placed at the board edge with low-inductance grounding - making it a drop-in solution for automotive-grade designs.
What is the thermal resistance from junction to ambient for SMBJ22 in standard PCB mounting?
The SMBJ22 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W when mounted on a standard FR-4 PCB with typical copper land patterns per JEDEC standards. This value assumes no added heatsinking; for sustained power dissipation above 1 W, thermal relief pads or thermal vias are recommended. Its RθJC of 10°C/W confirms efficient heat transfer to the PCB copper plane, supporting reliable operation up to +150°C junction temperature.
SMBJ22 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ22 FAQ
1.How can I place an order for SMBJ22 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22 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 SMBJ22 reliable?
The price and inventory of SMBJ22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22 is usually 5 days.
3.What payment methods are accepted for SMBJ22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22?
SMBJ22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22 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 SMBJ22?
For technical support, including SMBJ22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22 requirements.
6.How does Aetrix verify that SMBJ22 is sourced from the original manufacturer or authorized distributors?
All SMBJ22 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 SMBJ22 meets industry standards.
7.What is the process for return or replacement of SMBJ22?
All SMBJ22 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22, 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 SMBJ22 part is unused and in its original packaging.
Return procedure for SMBJ22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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