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Taiwan Semiconductor Corporation SMDJ22CAH
- Part No.:
- SMDJ22CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ22CAH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,932
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Product details
Overview
SMDJ22CAH from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 22V working stand-off voltage (VWM), 24.4–26.9V breakdown voltage (VBR), and 35.5V maximum clamping voltage (VC) at 84.5A peak pulse current - designed for automotive-grade ESD and load-dump protection in power rails and I/O interfaces.
For engineers reviewing the SMDJ22CAH datasheet, SMDJ22CAH pinout, SMDJ22CAH application, or SMDJ22CAH equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ22CAH implements a glass-passivated silicon junction optimized for fast transient suppression in both polarities. Its bidirectional configuration enables symmetrical clamping without external polarity management, supporting robust immunity against reverse-polarity transients and double-ended surges in 12V/24V automotive systems.
It operates across –55°C to +175°C junction temperature range, with 6.5W steady-state power dissipation and 300A non-repetitive forward surge rating. Thermal resistance values (RθJA = 75°C/W, RθJL = 15°C/W) confirm suitability for high-power PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 12V/24V systems. |
| VBR min/max | 24.4 V / 26.9 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 35.5 V - Clamped voltage at 84.5 A peak pulse current; limits downstream device stress during ISO 7637-2 Pulse 2b (load dump). |
| PPK | 3000 W - Peak pulse power handling per 1 ms waveform; supports high-energy transients without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Response time | <1.0 ps - Sub-picosecond junction response ensures clamping activation before sensitive ICs experience overvoltage damage. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and polarity indicated by cathode band (not applicable for bidirectional SMDJ22CAH - terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional TVS terminal | Either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Case | Thermal path / mechanical anchor | Exposed metal slug provides low-impedance thermal conduction to PCB copper; requires adequate thermal pad for RθJL = 15°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD - eliminates need for additional qualification effort. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling) waveforms - covers full automotive transient immunity standard. |
| Glass passivated junction | Stable VBR tolerance and low leakage (<1 µA at VWM) over lifetime and temperature - ensures long-term reliability in harsh environments. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT assembly and reduces production risk. |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 12V battery-supplied ECUs from load dump (ISO 7637-2 Pulse 2b) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power input and ground, absorbing up to 3000W surges without degradation. Use Value: Limits rail voltage to ≤35.5V during 84.5A transients, preventing damage to MCU power supplies and PMICs rated for 36V max input. | Use Scenario: Shielding CAN transceivers (e.g., TCAN1042, SN65HVD230) from ESD and bus faults in factory automation nodes. IC Role / Device Role / Timing Role: Common-mode TVS across CAN_H/CAN_L lines, leveraging symmetrical clamping to suppress ±25kV contact ESD (IEC 61000-4-2) and differential surges. Use Value: Maintains signal integrity below 35.5V clamping while preserving <1pF junction capacitance - avoids CAN bit timing distortion or false dominant detection. |
| Telecom DC Power Input | Renewable Energy Charge Controller |
Use Scenario: Safeguarding PoE-powered switches and base station RF modules from lightning-induced surges on 48V DC inputs. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC-DC converters, rated for repetitive 3000W pulses per IEC 61000-4-5. Use Value: Withstands ≥1000 surges at rated PPK due to robust silicon junction and thermal design - extends field service life in outdoor deployments. | Use Scenario: Protecting solar charge controllers from reverse polarity connection and PV array surge events during thunderstorms. IC Role / Device Role / Timing Role: Bidirectional clamp on battery-side terminals, suppressing both positive and negative transients generated by inductive switching in MPPT circuits. Use Value: Operates reliably from –55°C to +175°C ambient - supports deployment in desert or arctic climates without derating or thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA | Lower PPK (400W), smaller DO-214AC (SMA) package, higher RθJA (~125°C/W) | Not suitable for ISO 7637-2 Pulse 2b; limited to low-energy ESD in consumer port protection | Select only when surge energy is <50 mJ and board space is constrained. |
| SMBJ22CA | PPK = 600W, DO-214AA (SMB) package, RθJA ≈ 90°C/W, same VWM/VBR/VC specs | Supports moderate automotive transients (Pulse 1, 3a/b) but fails Pulse 2b due to lower energy rating | Use where cost is critical and full load-dump immunity is not required. |
Compared with SMAJ22CA and SMBJ22CA, the SMDJ22CAH delivers 5× and 5× higher peak power handling respectively, enabling direct compliance with ISO 7637-2 Pulse 2b in compact DO-214AB layout - essential for modern automotive and industrial power interface designs.
Availability
SMDJ22CAH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial CAN bus hardening, and telecom DC input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMDJ22CAH 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 automotive, industrial, and communications markets since 1979.
The SMDJ series was developed specifically for AEC-Q101-compliant, high-energy transient suppression in automotive power distribution and data interface systems - emphasizing ruggedness, thermal stability, and standardized ISO 7637-2 coverage.
FAQ
What is the clamping voltage of SMDJ22CAH at its rated peak pulse current?
The SMDJ22CAH has a maximum clamping voltage (VC) of 35.5 V at 84.5 A peak pulse current (IPPM), measured per the 10/1000 µs waveform defined in IEC 61000-4-5. This value ensures downstream components see limited overvoltage during standardized automotive transients like ISO 7637-2 Pulse 2b. The SMDJ22CAH maintains this clamping performance across its full operating temperature range.
Is SMDJ22CAH suitable for unidirectional applications?
No - the "CAH" suffix denotes bidirectional construction, meaning the SMDJ22CAH clamps symmetrically in both polarities. For unidirectional use, select the "AH" variant (e.g., SMDJ22AH), which features a cathode band and asymmetric forward/reverse behavior. Using SMDJ22CAH in place of SMDJ22AH introduces unnecessary cost and may misalign with circuit polarity assumptions.
Does SMDJ22CAH require special PCB layout considerations?
Yes - the DO-214AB (SMC) package of SMDJ22CAH relies on thermal pad area for effective heat dissipation. To achieve the specified RθJL = 15°C/W, the PCB must include a minimum 100 mm² copper pour connected to both terminals via multiple thermal vias. Narrow traces or insufficient copper will cause premature thermal runaway during repetitive surges.
What standards does SMDJ22CAH meet for automotive qualification?
The SMDJ22CAH is AEC-Q101 qualified and explicitly meets ISO 7637-2 test requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling). These certifications are documented in Taiwan Semiconductor's official qualification report (Version B2104), confirming suitability for front-end power protection in engine control units, body controllers, and ADAS modules.
How does moisture sensitivity affect SMDJ22CAH handling before reflow?
The SMDJ22CAH is rated at Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it has unlimited floor life and requires no baking or dry-pack storage prior to SMT reflow. This simplifies manufacturing logistics and eliminates yield loss from popcorning or delamination - a key advantage over MSL-3 or MSL-5 TVS devices in high-volume automotive production.
SMDJ22CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 84.5A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ22CAH FAQ
1.How can I place an order for SMDJ22CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ22CAH 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 SMDJ22CAH reliable?
The price and inventory of SMDJ22CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ22CAH is usually 5 days.
3.What payment methods are accepted for SMDJ22CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ22CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ22CAH?
SMDJ22CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ22CAH 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 SMDJ22CAH?
For technical support, including SMDJ22CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ22CAH requirements.
6.How does Aetrix verify that SMDJ22CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ22CAH 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 SMDJ22CAH meets industry standards.
7.What is the process for return or replacement of SMDJ22CAH?
All SMDJ22CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ22CAH, 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 SMDJ22CAH part is unused and in its original packaging.
Return procedure for SMDJ22CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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