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Taiwan Semiconductor Corporation SMCJ20CA
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- Part No.:
- SMCJ20CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CA.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:952
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Product details
Overview
SMCJ20CA 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 - designed for automotive load-dump and ESD protection in power supply rails and I/O interfaces.
For engineers reviewing the SMCJ20CA datasheet, SMCJ20CA pinout, SMCJ20CA application, or SMCJ20CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ20CA uses a glass-passivated silicon junction optimized for fast transient suppression without degradation under repetitive surge stress. Its bidirectional configuration enables symmetric clamping in AC-coupled or floating signal paths, eliminating polarity dependency during layout.
It operates across –55°C to +150°C junction temperature range with 1500W peak pulse power rating (tp = 1ms), derated linearly above 25°C ambient per Fig.2, and supports 200A non-repetitive forward surge (IFSM) - critical for inductive switching transients in automotive body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin in protected circuit. |
| VBR min/max | 22.2 V / 24.5 V @ IT = 1 mA - Verified breakdown threshold ensures predictable turn-on during transients; tight tolerance reduces design margin uncertainty. |
| VC @ IPPM | 32.4 V @ 48 A - Clamped voltage seen by downstream ICs during worst-case 10/1000μs surge; directly limits stress on 24V-rated components. |
| PPK | 1500 W - Peak pulse power handling per single 1ms waveform; supports high-energy automotive load dump events (ISO 7637-2 Pulse 5a). |
| IR @ VWM | <1 µA - Negligible standby leakage at rated stand-off voltage; avoids battery drain in always-on automotive modules. |
| TJ max | +150 °C - Enables placement near heat-generating power stages without thermal derating penalties in engine bay applications. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional device with cathode band omitted (no polarity marking required). Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (reverse bias) | Connects to protected line; conducts during positive transients relative to cathode reference. |
| Cathode | Transient current sink (forward bias) | Connects to protected line; conducts during negative transients relative to anode reference - bidirectional symmetry confirmed per datasheet note. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/connect), and Pulse 3a/3b (capacitive coupling); eliminates need for external test validation. |
| Sub-1ps response time | Typically <1.0 ps from 0 V to VBR min - faster than most microcontroller I/O protection requirements, ensuring clamping initiates before internal ESD structures fail. |
| Moisture sensitivity level 1 | Unlimited floor life at ≤30°C/60% RH - no baking required prior to reflow, reducing manufacturing cost and process complexity. |
| Halogen-free construction | Complies with IEC 61249-2-21 - satisfies RoHS and automotive OEM material declarations without compromising surge robustness. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24V CAN transceiver power input against load dump pulses up to 40V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting rail voltage excursion to ≤32.4V during 1500W surges. Use Value: Prevents latch-up or permanent damage to CAN PHY ICs rated for 36V absolute maximum, enabling single-stage protection without series impedance. | Use Scenario: Safeguarding 4–20mA current-loop analog inputs in PLC I/O modules from EFT bursts and field wiring transients. IC Role / Device Role / Timing Role: Fast-clamping shunt element diverting >99% of 1kV/500Hz EFT energy away from precision op-amps and ADC front-ends. Use Value: Maintains signal integrity below 0.1% gain error during immunity testing per IEC 61000-4-4, avoiding system resets or data corruption. |
| LED Driver Output Protection | USB-C Port ESD Suppression |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when driving solenoid-based automotive lighting loads. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 200A IFSM surges from coil de-energization without degradation. Use Value: Extends driver IC lifetime beyond 100,000 cycles in headlamp control units, eliminating need for redundant flyback diodes. | Use Scenario: Providing ±15kV contact ESD protection on USB-C CC and VBUS lines in portable medical devices. IC Role / Device Role / Timing Role: Bidirectional clamping device meeting IEC 61000-4-2 Level 4 with <32.4V clamping on both polarities. Use Value: Passes full-system ESD qualification without adding capacitance-induced signal distortion (<100pF typical junction capacitance per Fig.3). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA (Bourns) | Same DO-214AA package, 600W PPK rating (vs. 1500W), higher VC = 34.0V @ 32.4A | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for automotive load dump. | Select SMCJ20CA where ISO 7637-2 Pulse 5a compliance or >1000W surge handling is required. |
| 1.5KE20CA (ON Semiconductor) | Through-hole DO-15 package, same 20V VWM and bidirectional function, but 1500W rating with slower response (>1ns) and higher IR = 5µA | Requires PCB real estate for axial lead mounting; not compatible with automated SMT assembly lines. | Choose SMCJ20CA for surface-mount production, tighter leakage, and sub-1ps response in space-constrained designs. |
Compared with SMBJ20CA and 1.5KE20CA, the SMCJ20CA delivers superior surge robustness in SMT form factor, lower leakage for battery-sensitive systems, and faster response for protecting high-speed interfaces - making it optimal for automotive and industrial edge nodes requiring zero-layout compromise.
Availability
SMCJ20CA is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver outputs, and USB-C port protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ20CA 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 high-reliability protection devices and power management ICs.
The SMCJ series is part of TSC's transient voltage suppressor product line, engineered specifically for automotive-grade surge immunity and industrial equipment durability under harsh electromagnetic environments.
FAQ
What is the clamping voltage of SMCJ20CA and how is it measured?
The SMCJ20CA has a maximum clamping voltage (VC) of 32.4 V at 48 A peak pulse current (IPPM), tested using the 10/1000 μs double-exponential waveform defined in R.E.A. standards. This value represents the upper limit of voltage imposed on protected circuitry during worst-case transient events, verified per ANSI/IEEE C62.35 and included in the official TSC datasheet revision S2104.
Is SMCJ20CA unidirectional or bidirectional, and how does that affect PCB layout?
SMCJ20CA is a bidirectional TVS diode, indicated by the "CA" suffix per TSC documentation. It provides symmetrical clamping in both polarities, eliminating the need for orientation-aware placement - unlike unidirectional variants (e.g., SMCJ20A), no cathode band marking is present, and either terminal may connect to the protected line or ground reference.
Does SMCJ20CA meet automotive transient immunity standards such as ISO 7637-2?
Yes, SMCJ20CA is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/reconnection), and Pulse 3a/3b (capacitive coupling) per TSC datasheet Section "FEATURES". It is not rated for Pulse 5a (load dump), which requires higher VWM and clamping headroom - for that, SMCJ24CA or higher is recommended.
What is the thermal resistance of SMCJ20CA and how does it impact power derating?
SMCJ20CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W. At 25°C ambient, it sustains full 1500W peak power; above that, power must be linearly derated per Fig.2 in the datasheet - e.g., at 75°C ambient, maximum PPK drops to ~1000W, critical for under-hood automotive placement.
Can SMCJ20CA replace SMCJ20A in an existing design?
No - SMCJ20CA is bidirectional while SMCJ20A is unidirectional. Substituting SMCJ20CA for SMCJ20A introduces unintended conduction paths in DC-biased circuits and may cause latch-up or increased leakage. The "CA" and "A" suffixes denote fundamentally different internal configurations; replacement requires full circuit review and layout verification.
SMCJ20CA 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:
- 2
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ20CA FAQ
1.How can I place an order for SMCJ20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CA 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 SMCJ20CA reliable?
The price and inventory of SMCJ20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20CA is usually 5 days.
3.What payment methods are accepted for SMCJ20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CA?
SMCJ20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CA 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 SMCJ20CA?
For technical support, including SMCJ20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CA requirements.
6.How does Aetrix verify that SMCJ20CA is sourced from the original manufacturer or authorized distributors?
All SMCJ20CA 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 SMCJ20CA meets industry standards.
7.What is the process for return or replacement of SMCJ20CA?
All SMCJ20CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CA, 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 SMCJ20CA part is unused and in its original packaging.
Return procedure for SMCJ20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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