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Taiwan Semiconductor Corporation SMDJ12CA
- Part No.:
- SMDJ12CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ12CA.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
SMDJ12CA from Taiwan Semiconductor is a bidirectional 12V transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000W peak pulse power, 19.9V maximum clamping voltage at 150.8A peak current, and -55°C to +175°C operating junction temperature. It protects telecom, industrial, and consumer electronics against ESD, lightning-induced surges, and load-switch transients.
For engineers reviewing the SMDJ12CA datasheet, SMDJ12CA pinout, SMDJ12CA application, or SMDJ12CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 12V working stand-off voltage, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ12CA employs a glass-passivated silicon junction optimized for fast transient suppression with bidirectional symmetry-electrical characteristics apply identically in both directions. Its clamping behavior is defined by a 10/1000μs waveform per R.E.A., delivering 19.9V VC at 150.8A IPPM while maintaining ≤1μA reverse leakage at 12V VWM.
Designed for surface-mount automated placement, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance. The DO-214AB package supports 6.5W steady-state dissipation and achieves RθJL = 15°C/W for effective lead-to-junction heat transfer under surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 13.3–14.7 V - Verified breakdown threshold ensuring reliable turn-on margin above VWM |
| VC @ IPPM=150.8A | 19.9 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling per single non-repetitive 1ms event |
| IPPM | 150.8 A - Maximum peak impulse current supported at rated clamping voltage |
| TJ Range | −55°C to +175°C - Full operational junction temperature range for harsh-environment deployment |
| RθJA | 75 °C/W - Thermal resistance defining ambient-to-junction temperature rise under steady-state power |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, UL 94V-0 molding compound, 0.290g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical bidirectional clamping behavior-no polarity marking required for SMDJ12CA |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Electrical symmetry enables single-device protection of AC lines or differential buses without orientation constraints |
| ISO 7637-2 compliance | Validated immunity to automotive transient pulses (Pulse 1/2a/2b/3a/3b), supporting vehicle ECUs and infotainment systems |
| Sub-1ps response time | Ensures clamping activation before ESD or fast transients damage sensitive IC inputs |
| Glass passivation | Stable junction characteristics over lifetime and across temperature extremes, reducing parameter drift |
| Moisture sensitivity level 1 | Enables standard SMT reflow without pre-bake, lowering manufacturing cost and complexity |
Applications
| Automotive Infotainment Power Rails | Industrial Ethernet PHY Protection |
|---|---|
Use Scenario: Protecting 12V supply lines feeding head unit processors and display drivers from load-dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient energy before it reaches DC-DC regulators and microcontrollers. Use Value: Maintains 19.9V clamping ceiling during 150.8A surges, preventing latch-up or gate oxide damage in downstream ICs. | Use Scenario: Safeguarding RJ45 magnetics and PHY transceivers against ESD events and induced surges on data lines. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed across transformer center taps or line pairs. Use Value: Sub-1ps response ensures clamping activation prior to PHY input stage breakdown, preserving signal integrity. |
| Telecom Base Station DC Feeds | Consumer Audio Amplifier Inputs |
Use Scenario: Shielding 48V DC power inputs of remote radio units from lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Primary surge arrestor mounted at board edge, shunting >3000W transient energy to chassis ground. Use Value: 3000W PPK rating and 175°C TJMAX support sustained operation in outdoor enclosures with minimal derating. | Use Scenario: Preventing pop/click damage and amplifier latch-up caused by user-handling ESD on unbalanced analog inputs. IC Role / Device Role / Timing Role: Input-stage TVS placed directly at RCA or 3.5mm jack, referenced to signal ground. Use Value: 12V VWM allows safe operation with ±10V audio signals while clamping 8kV HBM ESD to <20V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12 | Lower PPK (1500W), higher VC (23.2V @ 65A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy ESD-only use cases | Select only when surge energy is constrained and cost sensitivity outweighs robustness requirements |
| SMLJ12CA | Same VWM/VBR/VC, but 1500W PPK, smaller DO-214AA (SMB) package | Reduced thermal mass limits duty-cycle capability; unsuitable for repetitive surge environments | Prefer where board space is critical and peak surge exposure is infrequent or low-energy |
Compared with SAC12 and SMLJ12CA, the SMDJ12CA delivers 100% higher peak power handling and lower clamping voltage at rated current-critical for protecting high-speed interfaces and automotive modules exposed to full ISO 7637-2 transients without layout redesign.
Availability
SMDJ12CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial Ethernet equipment, and telecom base station power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMDJ12CA 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, with global distribution and AEC-Q200 qualified product lines.
The SMDJ series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure-emphasizing rugged packaging, ISO 7637-2 compliance, and extended temperature reliability.
FAQ
What is the maximum clamping voltage of the SMDJ12CA under a 10/1000μs surge?
The SMDJ12CA exhibits a maximum clamping voltage (VC) of 19.9 V when subjected to a 150.8 A peak pulse current with a 10/1000μs waveform. This value is measured per R.E.A. standard and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMDJ12CA maintains this clamping performance across its full operating temperature range.
Is the SMDJ12CA unidirectional or bidirectional?
The SMDJ12CA is a bidirectional TVS diode, indicated by the "CA" suffix. Its electrical characteristics-including breakdown voltage, clamping voltage, and leakage current-are identical in both directions. Unlike unidirectional variants (e.g., SMDJ12A), the SMDJ12CA requires no polarity marking and is suitable for AC-coupled or differential signal protection.
Does the SMDJ12CA meet automotive transient standards?
Yes, the SMDJ12CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 3000W peak power rating and 19.9V clamping voltage enable robust protection of automotive ECUs, infotainment systems, and body control modules without additional external components.
What is the thermal resistance of the SMDJ12CA in its DO-214AB package?
The SMDJ12CA has a junction-to-ambient thermal resistance (RθJA) of 75°C/W and a junction-to-lead thermal resistance (RθJL) of 15°C/W, both specified under standard JEDEC test conditions. These values reflect the DO-214AB (SMC) package's ability to dissipate heat during surge events and steady-state operation, enabling reliable performance up to 175°C junction temperature.
Can the SMDJ12CA be used in place of the SMDJ12A?
No-the SMDJ12CA and SMDJ12A are functionally distinct: SMDJ12A is unidirectional (anode-cathode asymmetry), while SMDJ12CA is bidirectional (symmetrical conduction). Substituting one for the other without verifying circuit polarity and surge direction may result in failed protection or device destruction. Always match the "A" (unidirectional) or "CA" (bidirectional) suffix to system-level requirements.
SMDJ12CA 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 150.8A
- 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)
SMDJ12CA FAQ
1.How can I place an order for SMDJ12CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ12CA 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 SMDJ12CA reliable?
The price and inventory of SMDJ12CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ12CA is usually 5 days.
3.What payment methods are accepted for SMDJ12CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ12CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ12CA?
SMDJ12CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ12CA 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 SMDJ12CA?
For technical support, including SMDJ12CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ12CA requirements.
6.How does Aetrix verify that SMDJ12CA is sourced from the original manufacturer or authorized distributors?
All SMDJ12CA 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 SMDJ12CA meets industry standards.
7.What is the process for return or replacement of SMDJ12CA?
All SMDJ12CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ12CA, 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 SMDJ12CA part is unused and in its original packaging.
Return procedure for SMDJ12CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ12CA Tags
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