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Taiwan Semiconductor Corporation SMDJ14CA
- Part No.:
- SMDJ14CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ14CA.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
SMDJ14CA from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 14 V, breakdown voltage range 15.6–17.2 V, and clamping voltage of 23.2 V at 129.3 A peak pulse current. It uses a DO-214AB (SMC) package and is designed for ESD and surge protection in DC power rails and signal lines of industrial control systems.
For engineers reviewing the SMDJ14CA datasheet, SMDJ14CA pinout, SMDJ14CA application, or SMDJ14CA equivalent, key selection criteria include its bidirectional configuration, 3000 W peak pulse power rating, 23.2 V clamping voltage at 129.3 A, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and UL 94V-0 molding compound - all critical for automotive and industrial transient immunity design.
Technical Context
The SMDJ14CA is a single-die, bidirectional TVS diode engineered for fast clamping of high-energy transients. Its glass-passivated junction ensures stable breakdown behavior, while its low dynamic impedance enables consistent voltage limiting during 10/1000 µs waveform surges up to 129.3 A.
It operates across –55 °C to +175 °C junction temperature, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable performance in thermally constrained PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 15.6–17.2 V - Verified breakdown threshold ensuring predictable turn-on under surge conditions |
| VC @ IPPM=129.3 A | 23.2 V - Clamped voltage during 10/1000 µs transient, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling per single non-repetitive event per JEDEC standards |
| TJ max | +175 °C - Enables operation in high-temperature environments such as engine compartments or enclosed industrial enclosures |
| Package | DO-214AB (SMC) - Surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height, compatible with automated placement |
Pinout & Package
DO-214AB (SMC) package with cathode band marking for polarity identification; bidirectional configuration means both terminals are symmetrical and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; no fixed anode/cathode assignment due to bidirectional design |
| Cathode band (marking) | Reference orientation indicator | Visible band denotes terminal 1 on unidirectional variants; absent functional role in SMDJ14CA but retained for family consistency |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) - essential for automotive ECUs |
| Response time < 1.0 ps | Sub-picosecond junction response ensures clamping initiates before transient energy couples into protected ICs |
| Moisture sensitivity level 1 | No baking required prior to reflow; supports standard J-STD-020 assembly without special handling |
| UL 94V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for industrial and transportation equipment |
| Halogen-free construction | Complies with IEC 61249-2-21, enabling RoHS-compliant and environmentally regulated designs |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump and alternator transients in body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS device placed across VIN and GND to clamp surges before they reach LDOs or PMICs. Use Value: Limits voltage to ≤23.2 V during 129.3 A transients, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each isolated input channel, referenced to common ground. Use Value: Withstands repeated 3000 W pulses per IEC 61000-4-5 Level 4, maintaining signal integrity without degradation over 10,000+ cycles. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Guarding RS-485 transceiver bus lines in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across A/B lines and common-mode to ground. Use Value: Clamps common-mode transients to 23.2 V while preserving differential signaling margin above 1.5 V, meeting ITU-T K.21 basic protection requirements. | Use Scenario: Suppressing commutation spikes generated by brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive kickback during PWM switching. Use Value: Handles 300 A peak forward surge (IFSM = 300 A) and dissipates 3000 W pulses without failure, extending motor driver MOSFET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC14CA | Same VWM (14 V), lower PPK (1500 W), higher VC (25.5 V @ 75 A) | Not suitable for ISO 7637-2 Pulse 1 or high-energy load dump; limited to consumer-grade ESD-only use | Select only when cost sensitivity outweighs surge robustness and system-level immunity certification is not required. |
| SMLJ14CA | Same VWM (14 V), same PPK (3000 W), identical VC (23.2 V), but DO-214AA (SMA) package (smaller footprint, lower thermal mass) | Lower thermal inertia limits sustained pulse repetition rate; unsuitable for repetitive surge environments like motor drives | Prefer for space-constrained boards where single-event immunity suffices and thermal cycling is minimal. |
Compared with SAC14CA and SMLJ14CA, the SMDJ14CA delivers superior thermal robustness (RθJA = 75 °C/W vs. >100 °C/W), full ISO 7637-2 compliance, and proven reliability in automotive-grade production - making it the preferred choice for mission-critical transient suppression where long-term field stability is mandatory.
Availability
SMDJ14CA is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply, long-lifecycle support, and traceable sourcing for safety- and reliability-critical designs.
Supply support for SMDJ14CA 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 power management devices.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding certified immunity to ISO 7637-2 and IEC 61000-4-5 waveforms.
FAQ
What is the maximum clamping voltage of the SMDJ14CA under standard test conditions?
The SMDJ14CA has a maximum clamping voltage (VC) of 23.2 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 129.3 A at TA = 25 °C. This value is measured across the device terminals during standardized surge testing and defines the upper voltage limit imposed on protected circuits during transient events. The SMDJ14CA maintains this clamping performance consistently across its specified operating temperature range.
Is the SMDJ14CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMDJ14CA is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - making it suitable for protecting electronic control units (ECUs), body modules, and infotainment systems in 12 V automotive platforms. Its 3000 W peak power rating and verified clamping behavior ensure robust immunity against load dump, battery disconnection, and switching noise transients defined in the standard. The SMDJ14CA's qualification data is documented in Taiwan Semiconductor's official specification I2104.
What is the junction temperature range for the SMDJ14CA, and how does it affect PCB layout?
The SMDJ14CA supports a junction temperature range of –55 °C to +175 °C, enabling deployment in under-hood automotive or high-ambient industrial environments. Its RθJA of 75 °C/W requires adequate copper pour and thermal vias beneath the DO-214AB (SMC) package to maintain safe operating temperatures during repetitive surge events. For continuous high-power operation, thermal simulation using the SMDJ14CA's RθJL = 15 °C/W is recommended to optimize lead-frame heat extraction.
Does the SMDJ14CA have polarity markings, and how does that impact board design?
The SMDJ14CA is a bidirectional TVS diode and carries no functional polarity - both terminals are electrically identical. While it retains the cathode band marking inherited from the unidirectional SMDJ14A family for manufacturing consistency, this band has no electrical significance in the SMDJ14CA. Board layout may orient the device freely; no silkscreen polarity alignment is required, simplifying placement and reducing assembly errors. This symmetry is confirmed in the "Electrical characteristics apply in both directions" note on page 2 of the I2104 datasheet.
How does the SMDJ14CA compare to unidirectional TVS diodes like the SMDJ14A in terms of circuit protection capability?
The SMDJ14CA provides symmetrical clamping for both positive and negative transients, whereas the SMDJ14A only protects against reverse-polarity surges. In AC-coupled or floating signal lines - such as RS-485 buses or transformer-isolated interfaces - the SMDJ14CA eliminates the need for dual-diode configurations. Its bidirectional behavior is intrinsic to the die structure, not external circuitry, and delivers identical VBR, VC, and PPK performance in both directions - a capability the SMDJ14A cannot replicate without additional components.
SMDJ14CA 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 129.3A
- 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)
SMDJ14CA FAQ
1.How can I place an order for SMDJ14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ14CA 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 SMDJ14CA reliable?
The price and inventory of SMDJ14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ14CA is usually 5 days.
3.What payment methods are accepted for SMDJ14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ14CA?
SMDJ14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ14CA 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 SMDJ14CA?
For technical support, including SMDJ14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ14CA requirements.
6.How does Aetrix verify that SMDJ14CA is sourced from the original manufacturer or authorized distributors?
All SMDJ14CA 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 SMDJ14CA meets industry standards.
7.What is the process for return or replacement of SMDJ14CA?
All SMDJ14CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ14CA, 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 SMDJ14CA part is unused and in its original packaging.
Return procedure for SMDJ14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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