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Taiwan Semiconductor Corporation SMDJ20CA
- Part No.:
- SMDJ20CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ20CA.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
SMDJ20CA from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 22.2V minimum breakdown voltage (VBR), 20V working stand-off voltage (VWM), and 32.4V maximum clamping voltage (VC) at 92.6A peak pulse current - designed to protect telecom and industrial power rails against ESD, lightning surges, and load-switching transients.
For engineers reviewing the SMDJ20CA datasheet, SMDJ20CA pinout, SMDJ20CA application, or SMDJ20CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ20CA employs a glass-passivated silicon junction optimized for high-energy transient suppression in automotive and industrial environments. It delivers symmetrical clamping in both directions with VBR = 22.2–24.5V at IT = 1mA and clamps to ≤32.4V at IPPM = 92.6A under 10/1000μs waveform per Fig.5.
Its thermal design supports continuous operation up to TJ = 175°C, with RθJL = 15°C/W enabling effective heat transfer to PCB copper. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - suitable for lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum DC or RMS voltage the device blocks continuously without conduction |
| VBR (min/max) | 22.2 / 24.5 V @ IT = 1 mA - Ensures reliable turn-on above normal operating voltage while avoiding false triggering |
| VC @ IPPM | 32.4 V @ 92.6 A - Limits downstream voltage stress during 10/1000μs surge events |
| PPK | 3000 W - Peak pulse power handling capacity per single non-repetitive transient |
| TJ max | +175 °C - Enables use in under-hood or high-ambient industrial enclosures without derating |
| RθJA | 75 °C/W - Defines thermal rise from junction to ambient on standard FR-4, guiding copper pour design |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for unidirectional variants; SMDJ20CA is bidirectional and marked "DEV", with no polarity indicator required. Leads are matte tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | No fixed anode/cathode - conducts identically in either direction during overvoltage events |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat path to PCB; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and supply-line transient immunity (Pulse 1/2a/2b/3a/3b) |
| Sub-1 ps response time | Clamps before sensitive ICs experience damaging overvoltage - critical for protecting high-speed interfaces |
| Level 1 moisture sensitivity | Allows direct placement into reflow without baking, reducing manufacturing overhead |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant production |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V CAN bus power lines and sensor supply rails from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input rail to shunt surge energy to ground before reaching DC-DC converters or microcontrollers. Use Value: Clamps to 32.4V during 92.6A pulses, keeping downstream 3.3V/5V logic supplies within safe operating range per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding analog input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor mounted directly at terminal block entry point, upstream of signal conditioning circuitry. Use Value: 3000W peak power rating absorbs multi-kV transients from inductive load switching without degradation over >10,000 events. |
| Telecom Base Station DC Feeds | Consumer Power Adapter Outputs |
Use Scenario: Shielding 48V DC power inputs of remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage protection stage paralleled with fuse and MOV, rated for repeated 10/1000μs surges. Use Value: 20V working voltage allows compatibility with 48V nominal systems using 2:1 derating; 175°C rating supports sealed outdoor enclosures. | Use Scenario: Secondary-side surge protection on 12V/19V outputs of laptop AC adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS placed immediately after DC output connector to intercept fast ESD events before reaching USB-C PD controllers. Use Value: Sub-1ps response ensures clamping occurs before 15kV contact ESD (IEC 61000-4-2) propagates into power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC20CA (Littelfuse) | Same DO-214AB package; VBR = 22.2–24.5V, VC = 32.4V @ 92.6A, but rated for 2500W peak power | Lower PPK limits suitability for repetitive high-energy surges in automotive load-dump scenarios | Select when cost sensitivity outweighs need for full 3000W margin or when legacy Littelfuse BOM alignment is required |
| 1.5KE20CA (ON Semiconductor) | Through-hole DO-15 package; identical VWM/VBR/VC specs but higher RθJA (~100°C/W) and lower surge endurance | Not suitable for automated SMT lines; requires wave soldering and occupies more board area | Choose only for prototyping, repair, or legacy through-hole designs where rework flexibility is prioritized over density and thermal performance |
Compared with SAC20CA and 1.5KE20CA, the SMDJ20CA offers superior thermal dissipation (RθJA = 75°C/W), full 3000W surge rating, and SMT compatibility - making it optimal for high-volume, space-constrained, and thermally demanding applications such as automotive ECUs and industrial edge controllers.
Availability
SMDJ20CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom base station DC feeds, and consumer power adapter outputs requiring stable component supply and consistent surge immunity performance.
Supply support for SMDJ20CA 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 qualified product lines.
The SMDJ series is engineered specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ISO 7637-2 and IEC 61000-4-5 surges is mandatory.
FAQ
What is the polarity configuration of SMDJ20CA?
The SMDJ20CA is a bidirectional TVS diode with symmetrical clamping characteristics in both directions. Unlike unidirectional variants (e.g., SMDJ20A), it has no designated anode or cathode and does not feature a cathode band marking. This makes it ideal for AC-coupled or floating-rail protection where polarity reversal may occur. Its electrical specifications - including VBR, VC, and IPPM - apply identically in either direction, as confirmed in the TSC datasheet Section "Electrical Specifications" for SMDJ20CA.
Does SMDJ20CA meet automotive transient immunity standards?
Yes, the SMDJ20CA meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, which cover typical automotive electrical disturbances including battery disconnect, load dump, and inductive switching transients. Its 3000W peak power rating, 32.4V clamping voltage at 92.6A, and 175°C junction temperature rating make it suitable for front-end protection in engine control units, body control modules, and infotainment power supplies. TSC validates this compliance per the test conditions defined in the official ISO standard.
What is the maximum steady-state power dissipation for SMDJ20CA?
The SMDJ20CA has a steady-state power dissipation (PD) of 6.5W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value decreases linearly with rising ambient temperature - for example, at 100°C ambient, PD drops to approximately 2.5W based on the derating curve (Fig.2). Engineers must ensure PCB copper area and airflow support this thermal profile, especially when used near other heat-generating components. The SMDJ20CA's RθJA = 75°C/W guides heatsinking requirements for sustained operation.
How does SMDJ20CA compare to SMDJ20A in terms of application use?
The SMDJ20CA is bidirectional, while SMDJ20A is unidirectional - meaning SMDJ20CA clamps symmetrically across both polarities and is used where voltage reversals or AC signals are present, such as telecom line interfaces or floating DC buses. In contrast, SMDJ20A includes a cathode band and only clamps in reverse bias, making it appropriate for standard DC rail protection with known polarity. Both share identical VWM, VBR, and VC values, but their circuit placement and layout constraints differ significantly due to polarity dependency.
Is SMDJ20CA compatible with lead-free reflow soldering processes?
Yes, the SMDJ20CA is fully compatible with lead-free reflow soldering. It is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into standard Pb-free reflow profiles (e.g., JEDEC J-STD-020D peak of 260°C) without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AB molding compound meets UL 94V-0 flammability - ensuring process robustness and reliability in high-volume SMT assembly lines.
SMDJ20CA 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ20CA FAQ
1.How can I place an order for SMDJ20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ20CA 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 SMDJ20CA reliable?
The price and inventory of SMDJ20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ20CA is usually 5 days.
3.What payment methods are accepted for SMDJ20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ20CA?
SMDJ20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ20CA 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 SMDJ20CA?
For technical support, including SMDJ20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ20CA requirements.
6.How does Aetrix verify that SMDJ20CA is sourced from the original manufacturer or authorized distributors?
All SMDJ20CA 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 SMDJ20CA meets industry standards.
7.What is the process for return or replacement of SMDJ20CA?
All SMDJ20CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ20CA, 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 SMDJ20CA part is unused and in its original packaging.
Return procedure for SMDJ20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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