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Taiwan Semiconductor Corporation SMBJ22CH
- Part No.:
- SMBJ22CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22CH.pdf
- Description:
- 600W, 27.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,413
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Product details
Overview
SMBJ22CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 22 V working stand-off voltage (VWM), 24.4–29.8 V breakdown voltage (VBR), 39.4 V maximum clamping voltage (VC) at 15 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMBJ22CH datasheet, SMBJ22CH pinout, SMBJ22CH application, or SMBJ22CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 22 V, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMBJ22CH operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transient overvoltages. Its bidirectional configuration allows symmetrical clamping in both polarities, eliminating polarity-sensitivity concerns in AC-coupled or floating signal lines.
It meets ISO 7637-2 immunity requirements for automotive electronics and supports steady-state power dissipation of 3 W at 25°C ambient, with junction temperature range from –55°C to +150°C and thermal resistance RθJA = 55°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min / max | 24.4 V / 29.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on margin above VWM |
| VC @ IPP | 39.4 V @ 15 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected IC |
| PPK | 600 W - Peak pulse power handling capability; determines survivability against high-energy transients |
| ID @ VWM | ≤1 µA - Low leakage preserves system power budget and avoids false triggering in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | DO-214AA (SMB) - Standard surface-mount outline with 0.090 g mass; compatible with automated placement and reflow |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMBJ22CH; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; either terminal serves as anode or cathode depending on transient polarity |
| Case | Non-conductive molding compound | UL 94V-0 rated; provides electrical isolation and mechanical robustness |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and infotainment systems |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD coupling) waveforms |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, protecting nanosecond-scale logic interfaces |
| Moisture sensitivity level 1 | No floor life limitation; suitable for standard SMT assembly without dry-pack or baking requirements |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and CAN node power inputs against load dump and jump-start surges in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VCC and GND upstream of LDO regulators and communication ICs. Use Value: Clamps transients to ≤39.4 V, preventing latch-up or permanent damage to 3.3 V/5 V logic while maintaining AEC-Q101 reliability. | Use Scenario: Shielding analog front-end amplifiers and ADC inputs in factory automation sensors exposed to relay coil flyback and EFT noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across differential signal pairs or supply rails to shunt fast transients before they reach precision circuitry. Use Value: Sub-1 ps response ensures clamping initiates before 10 ns edge rates propagate into sensitive nodes, preserving signal integrity. |
| LED Driver Overvoltage Suppression | USB Port ESD Hardening |
Use Scenario: Safeguarding constant-current LED drivers in streetlight and automotive lighting modules from inductive switching spikes. IC Role / Device Role / Timing Role: Mounted across driver output terminals to clamp reverse EMF from long cable runs or relay-controlled loads. Use Value: 600 W peak power rating absorbs repetitive 100 V/10 A surges common in outdoor lighting installations without degradation. | Use Scenario: Adding secondary-level ESD protection on USB 2.0 VBUS and D+/D− lines in embedded host controllers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed after primary protection to handle contact discharge up to ±15 kV per IEC 61000-4-2. Use Value: ≤1 µA leakage at 22 V prevents VBUS droop or false disconnect detection during idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA | Same VWM (22 V), VBR (24.4–29.8 V), and VC (39.4 V); identical DO-214AA package and AEC-Q101 qualification | No functional difference; CA and CH suffixes denote same bidirectional specification per Taiwan Semiconductor documentation | Select SMBJ22CA if sourcing from alternate distributor channels where CH-marked reels are unavailable |
| SMCJ22CA | Higher PPK (1500 W), larger DO-214AB (SMC) package, same VWM/VBR/VC ratings | Used where higher surge energy (e.g., ISO 7637-2 Pulse 5a) must be absorbed; requires PCB layout change due to larger footprint | Choose SMCJ22CA only when 600 W is insufficient and board space permits larger SMC package |
Compared with SMBJ22CH, SMBJ22CA offers identical electrical and qualification specs with no design impact, while SMCJ22CA delivers 2.5× higher surge capacity at the cost of increased size and thermal mass-making it suitable only for higher-energy threat profiles.
Availability
SMBJ22CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver circuits, and USB port hardening requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMBJ22CH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJH series was developed to deliver AEC-Q101-qualified, high-reliability TVS protection in compact SMB packages for 12 V and 24 V automotive subsystems and ruggedized industrial controls.
FAQ
What does the "CH" suffix indicate in SMBJ22CH?
The "CH" suffix in SMBJ22CH denotes a bidirectional transient voltage suppressor configuration, meaning the device clamps overvoltage transients equally in both polarities. This eliminates the need for polarity-aware placement on PCBs and makes SMBJ22CH ideal for AC-coupled lines, floating grounds, or differential signal paths where voltage reversal may occur. The "H" indicates high-temperature grade (150°C junction rating).
Is SMBJ22CH compliant with automotive qualification standards?
Yes, SMBJ22CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements-making it suitable for use in automotive ECUs, body control modules, and infotainment systems. Its glass-passivated junction, moisture sensitivity level 1, and operating temperature range of –55°C to +150°C further support under-hood and chassis-mounted deployment.
How does SMBJ22CH compare to unidirectional SMBJ22H in terms of circuit protection?
SMBJ22CH provides symmetrical clamping for both positive and negative transients, whereas SMBJ22H clamps only in one direction and requires correct polarity orientation. In applications like LIN bus or RS-485 lines where signal polarity reverses, SMBJ22CH avoids miswiring risk and simplifies layout. However, SMBJ22H offers slightly lower leakage (<0.5 µA typical) in forward bias-relevant only when used in DC-biased configurations.
What is the maximum clamping voltage of SMBJ22CH and why does it matter?
The maximum clamping voltage (VC) of SMBJ22CH is 39.4 V at 15 A peak pulse current (10/1000 µs waveform). This value defines the highest voltage that will appear across downstream components during a surge event. For example, if protecting a 24 V automotive microcontroller with 40 V absolute maximum rating, SMBJ22CH ensures safe operation by limiting transient exposure below that threshold-critical for preventing gate oxide rupture or latch-up.
Can SMBJ22CH be used in place of SMBJ22CA?
Yes, SMBJ22CH and SMBJ22CA are functionally identical: same VWM (22 V), VBR (24.4–29.8 V), VC (39.4 V), package (DO-214AA), and AEC-Q101 qualification. Taiwan Semiconductor's documentation confirms CH and CA suffixes denote the same bidirectional specification within the SMBJH series. No PCB or schematic changes are needed when substituting SMBJ22CH for SMBJ22CA or vice versa.
SMBJ22CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ22CH FAQ
1.How can I place an order for SMBJ22CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22CH 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 SMBJ22CH reliable?
The price and inventory of SMBJ22CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22CH is usually 5 days.
3.What payment methods are accepted for SMBJ22CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22CH?
SMBJ22CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22CH 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 SMBJ22CH?
For technical support, including SMBJ22CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22CH requirements.
6.How does Aetrix verify that SMBJ22CH is sourced from the original manufacturer or authorized distributors?
All SMBJ22CH 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 SMBJ22CH meets industry standards.
7.What is the process for return or replacement of SMBJ22CH?
All SMBJ22CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22CH, 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 SMBJ22CH part is unused and in its original packaging.
Return procedure for SMBJ22CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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