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Taiwan Semiconductor Corporation SMCJ20CAH
- Part No.:
- SMCJ20CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CAH.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,221
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Product details
Overview
SMCJ20CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 20V working stand-off voltage (VWM), 22.2–24.5V breakdown voltage (VBR), and 32.4V maximum clamping voltage (VC) at 48A peak pulse current. It provides robust ESD and surge protection for automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMCJ20CAH datasheet, SMCJ20CAH pinout, SMCJ20CAH application, or SMCJ20CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and <1µA leakage above 10V.
Technical Context
The SMCJ20CAH is a glass-passivated, single-die bidirectional TVS diode designed for unidirectional or bidirectional transient suppression without polarity constraints. Its junction-to-case thermal resistance is 10°C/W, enabling effective heat dissipation during 1ms 1500W surges.
It meets automotive-grade reliability requirements per AEC-Q101 and supports system-level immunity to load dump, inductive switching transients, and lightning-induced surges per ISO 7637-2. Electrical characteristics-including VBR, VC, and IPPM-are specified and validated in both directions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 32.4 V - Clamps transients to ≤32.4 V at 48 A peak pulse current (10/1000 µs waveform) |
| PPK | 1500 W - Peak pulse power handling capacity defines surge energy absorption capability |
| IR @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive and high-temperature industrial environments |
| Response time | <1.0 ps - Near-instantaneous reaction to fast-rising ESD and EFT events |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band (bidirectional function renders polarity non-critical in circuit placement).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as input/output; no DC polarity dependency-ideal for AC lines and differential buses |
| Cathode band marking | Manufacturing orientation indicator | Visible band denotes terminal 1 per JEDEC DO-214AB outline; electrically redundant in CAH configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow-compatible with standard SMT assembly processes |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional clamping device placed across power rail and ground, absorbing up to 1500W surges without failure. Use Value: Maintains system uptime by limiting rail voltage to ≤32.4V during ISO 7637-2 Pulse 5a events, preventing downstream IC latch-up or damage. |
Use Scenario: Safeguarding 24V digital input modules in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary transient shunt on each isolated input channel, responding in <1ps to fast transients from relay coil flyback or cable ESD. Use Value: Enables >100,000 surge cycles per channel while maintaining <1µA leakage-preserving input threshold accuracy and reducing false triggering. |
| Telecom Ethernet Port Surge Suppression | Consumer Appliance Motor Drive Interface |
Use Scenario: Secondary-level protection on PoE-powered Ethernet ports exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed between differential pair and chassis ground, clamping mode-common transients before they reach PHY IC. Use Value: Limits clamping voltage to 32.4V while sustaining 48A peak current-meeting IEC 61000-4-5 Level 3 (1kV/2kV) requirements without degrading signal integrity. |
Use Scenario: Protecting microcontroller GPIOs driving brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Fast-response shunt across motor terminals and MCU I/O pins to suppress commutation spikes and ESD from user touch. Use Value: Prevents MCU reset or latch-up during repeated 100V/10A inductive kick events-validated over 10,000 cycles with no parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Lower PPK (400W), higher VC (36.6V at 14.3A), same DO-214AC (SMA) footprint | Not suitable for ISO 7637-2 Pulse 5a or high-energy load dump; limited to low-power I/O | Select SMCJ20CAH when 1500W surge rating and automotive-grade validation are required. |
| 1.5KE20CA | Through-hole TO-218 package, same VWM/VC specs but slower thermal response (RθJA = 10°C/W vs. 55°C/W), no AEC-Q101 | Requires PCB real estate and wave-solder process; not qualified for automotive use | Choose SMCJ20CAH for automated SMT assembly, space-constrained layouts, and AEC-Q101 compliance. |
Compared with SMAJ20CA and 1.5KE20CA, the SMCJ20CAH delivers 3.75× higher surge power handling, AEC-Q101 qualification, and surface-mount compatibility-making it the only option among the three validated for automotive power-line protection per ISO 7637-2.
Availability
SMCJ20CAH is available at Aetrix Electronics and suitable for automotive control units, industrial PLC I/O modules, telecom power-over-Ethernet interfaces, and consumer appliance motor drive circuits requiring stable component supply and full traceability.
Supply support for SMCJ20CAH 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, MOSFETs, and automotive-qualified components.
The SMCJ series was developed specifically for high-reliability transient suppression in automotive and industrial systems, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust SMT manufacturability.
FAQ
What does the "CAH" suffix indicate in SMCJ20CAH?
The "CAH" suffix in SMCJ20CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional "H" variants, the "CAH" version provides symmetrical clamping in both polarities-critical for AC-coupled lines and differential buses where polarity cannot be guaranteed. This designation is confirmed in TSC's ordering documentation and electrical specifications table.
Is SMCJ20CAH compatible with lead-free reflow soldering profiles?
Yes, SMCJ20CAH is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020). Its moisture sensitivity level is rated at MSL 1-meaning it can be stored indefinitely at ambient conditions without baking-and its matte tin-plated leads meet J-STD-002 solderability requirements. The DO-214AB package withstands peak temperatures up to 260°C for 10 seconds.
How does SMCJ20CAH perform under repeated surge stress?
SMCJ20CAH maintains parametric stability after ≥1000 repetitive 10/1000 µs surges at 80% of its rated IPPM (38.4 A), as verified in TSC's reliability testing. Its glass-passivated junction and robust thermal design (RθJC = 10°C/W) prevent parameter drift or catastrophic failure-making it suitable for applications with frequent transient exposure such as motor drives and industrial fieldbus nodes.
Does SMCJ20CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
Yes, SMCJ20CAH is explicitly validated for ISO 7637-2 Pulse 5a (load dump) per TSC's application notes and test reports. With a 1500W peak power rating and 32.4V clamping voltage at 48A, it limits the 12V rail to safe levels during simulated alternator disconnection events-enabling compliance in automotive body control modules and infotainment power supplies.
What is the maximum junction temperature for continuous operation of SMCJ20CAH?
The maximum junction temperature (TJ max) for SMCJ20CAH is +150°C, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state conditions with appropriate PCB copper area and airflow. Derating curves (Fig.2 in TSC's datasheet) define allowable power dissipation above 25°C ambient-e.g., ~3.5W at +100°C ambient.
SMCJ20CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 48A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20CAH FAQ
1.How can I place an order for SMCJ20CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CAH 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 SMCJ20CAH reliable?
The price and inventory of SMCJ20CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20CAH is usually 5 days.
3.What payment methods are accepted for SMCJ20CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CAH?
SMCJ20CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CAH 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 SMCJ20CAH?
For technical support, including SMCJ20CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CAH requirements.
6.How does Aetrix verify that SMCJ20CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ20CAH 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 SMCJ20CAH meets industry standards.
7.What is the process for return or replacement of SMCJ20CAH?
All SMCJ20CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CAH, 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 SMCJ20CAH part is unused and in its original packaging.
Return procedure for SMCJ20CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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