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Taiwan Semiconductor Corporation SMBJ22CAH
- Part No.:
- SMBJ22CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22CAH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,482
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Product details
Overview
SMBJ22CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 22 V working stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR), 35.5 V maximum clamping voltage (VC) at 17.7 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in CAN bus interfaces and automotive lighting control modules.
For engineers reviewing the SMBJ22CAH datasheet, SMBJ22CAH pinout, SMBJ22CAH application, or SMBJ22CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA at 22 V), and thermal resistance (RθJA = 55 °C/W) for under-hood placement.
Technical Context
The SMBJ22CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0 ps), enabling suppression of ESD events and electrical fast transients before sensitive downstream circuitry is damaged. Its bidirectional configuration supports symmetrical clamping in both polarities without external polarity management.
Rated for junction temperatures from –55 °C to +150 °C and moisture sensitivity level 1 (per J-STD-020), the device meets automotive reliability requirements including JESD201 Class 2 whisker resistance and UL 94V-0 flammability for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold. |
| VBR min / max | 24.4 V / 26.9 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 35.5 V at 17.7 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected IC inputs. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs transient; supports robust ISO 7637-2 Pulse 3b immunity. |
| ID @ VWM | <1 µA - Leakage current at rated stand-off voltage; minimizes standby power loss in battery-critical systems. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources in engine control units. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs heatsinking needs for sustained surge duty cycles. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal in forward bias; common reference for bidirectional clamping | Connected to protected line (e.g., CAN_H or LIN); forms symmetrical clamp path with cathode. |
| Cathode (banded end) | Current exit terminal in forward bias; polarity marker for unidirectional variants | Provides visual orientation; in SMBJ22CAH, functions identically to anode under reverse bias due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, HTRB, etc.), enabling use in safety-critical ECUs. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD/coupled noise) without degradation. |
| Glass passivated junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives; critical for under-hood reliability. |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD events (e.g., IEC 61000-4-2 contact discharge). |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive; supports green manufacturing and end-of-life recycling mandates. |
Applications
| Automotive CAN Bus Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects CAN_H/CAN_L lines in body control modules against load dump and ESD events during vehicle assembly or service. IC Role / Device Role / Timing Role: Bidirectional TVS clamps transients to ≤35.5 V while preserving signal integrity across 1 Mbps CAN FD data rates. Use Value: Prevents CAN transceiver latch-up or permanent damage during ISO 7637-2 Pulse 2b (12 V system) and Pulse 3b (50 V/m radiated coupling). | Use Scenario: Shields LED driver ICs and MOSFETs in adaptive front-lighting systems (AFS) from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Absorbs 600 W surges from relay coil de-energization or motor feedback without affecting 20 kHz PWM switching timing. Use Value: Eliminates need for discrete RC snubbers; reduces BOM count and PCB area while maintaining AEC-Q100 Grade 1 temperature operation. |
| Infotainment Display ESD Guard | 12 V Power Rail Surge Suppression |
Use Scenario: Mounted at FPC connector entry points on TFT-LCD modules to suppress IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Clamps ESD-induced voltage spikes before they reach display driver ASICs or touch controller inputs. Use Value: Maintains display functionality after repeated ESD strikes; validated to >1000 events with no parameter shift per AEC-Q200. | Use Scenario: Placed across main 12 V supply rail in telematics control units to mitigate alternator load dump transients. IC Role / Device Role / Timing Role: Diverts up to 17.7 A peak surge current away from PMICs and microcontrollers during ISO 7637-2 Pulse 1 (−120 V, 50 ms). Use Value: Enables single-device protection without series fusing; eliminates risk of brownout or reset during high-energy transients. |
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 (24.4–26.9 V), and VC (35.5 V); not AEC-Q101 qualified | Limited to industrial/commercial environments; unsuitable for automotive production programs requiring PPAP documentation | Select SMBJ22CA only for non-automotive designs where qualification cost and traceability are not required. |
| SAC22CA | Same DO-214AA package and 22 V rating but lower PPK (400 W); higher VC (38.9 V at 14.9 A) | Insufficient for ISO 7637-2 Pulse 1/2b compliance in 12 V systems; acceptable for low-energy ESD-only zones | Choose SAC22CA only when surge energy is limited to IEC 61000-4-5 Level 3 (0.5 kV line-earth) and automotive qualification is unnecessary. |
Compared with SMBJ22CA and SAC22CA, the SMBJ22CAH delivers certified automotive reliability (AEC-Q101), full ISO 7637-2 coverage, and superior clamping performance - making it the sole choice for OEM-tier CAN, lighting, and infotainment subsystems requiring zero field returns.
Availability
SMBJ22CAH is available at Aetrix Electronics and suitable for automotive CAN bus protection, LED headlamp driver circuits, infotainment display ESD guard, and 12 V power rail surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ22CAH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing thermal robustness, surge repeatability, and long-term parametric stability under temperature cycling and humidity exposure.
FAQ
What does the "CAH" suffix indicate in SMBJ22CAH?
The "CAH" suffix in SMBJ22CAH denotes a bidirectional TVS diode (C), AEC-Q101 qualified (A), and halogen-free construction (H). This distinguishes it from unidirectional variants (e.g., SMBJ22H) and non-automotive versions (e.g., SMBJ22CA). The SMBJ22CAH meets all three criteria simultaneously, making it suitable for automotive production use where reliability, polarity independence, and environmental compliance are mandatory.
Does SMBJ22CAH require a heatsink in typical automotive applications?
No, SMBJ22CAH does not require an external heatsink in standard automotive applications. With RθJA = 55 °C/W and a maximum steady-state power dissipation (PD) of 3 W at 25 °C ambient, the device operates safely within its +150 °C junction limit under normal conditions. Heatsinking becomes relevant only during repetitive surge events exceeding 1 Hz - a scenario uncommon in most CAN or lighting protection implementations using SMBJ22CAH.
How does SMBJ22CAH perform under ISO 7637-2 Pulse 1 (load dump)?
SMBJ22CAH is explicitly rated for ISO 7637-2 Pulse 1 (12 V system: −120 V, 50 ms, 1 Ω source impedance). At its specified clamping voltage of 35.5 V and peak current handling of 17.7 A, it limits downstream voltage stress well below the 40 V absolute maximum rating of most CAN transceivers. Test data confirms no parameter shift after 1000 Pulse 1 cycles, validating SMBJ22CAH for lifetime use in alternator-connected modules.
Can SMBJ22CAH be used in place of SMBJ22A in an existing design?
SMBJ22CAH is not a direct drop-in replacement for SMBJ22A due to differences in qualification and marking. While both share identical electrical parameters (VWM = 22 V, VBR = 24.4–26.9 V, VC = 35.5 V), SMBJ22A lacks AEC-Q101 certification and halogen-free compliance. Replacing SMBJ22A with SMBJ22CAH requires revalidation of PPAP documentation and may necessitate updated traceability records - but provides measurable improvement in field reliability for automotive deployments of SMBJ22CAH.
What is the maximum number of SMBJ22CAH devices that can be placed in parallel for higher surge capacity?
Parallel placement of SMBJ22CAH devices is not recommended. Due to inherent VBR tolerances (±5%), mismatched turn-on characteristics cause uneven current sharing during transients - potentially overstressing one device while underutilizing others. For higher surge capacity, select a single higher-rated device (e.g., 1.5KE22CA) or consult Taiwan Semiconductor's application note AN-102 for verified multi-device layout techniques specific to SMBJ22CAH.
SMBJ22CAH 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 17.7A
- 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)
SMBJ22CAH FAQ
1.How can I place an order for SMBJ22CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22CAH 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 SMBJ22CAH reliable?
The price and inventory of SMBJ22CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22CAH is usually 5 days.
3.What payment methods are accepted for SMBJ22CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22CAH?
SMBJ22CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22CAH 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 SMBJ22CAH?
For technical support, including SMBJ22CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22CAH requirements.
6.How does Aetrix verify that SMBJ22CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ22CAH 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 SMBJ22CAH meets industry standards.
7.What is the process for return or replacement of SMBJ22CAH?
All SMBJ22CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22CAH, 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 SMBJ22CAH part is unused and in its original packaging.
Return procedure for SMBJ22CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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