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Taiwan Semiconductor Corporation SMDJ26CA
- Part No.:
- SMDJ26CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ26CA.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
SMDJ26CA from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 26 V, breakdown voltage range of 28.9–31.9 V, and clamping voltage of 42.1 V at 71.3 A peak pulse current. It protects telecom and industrial circuits against ESD, load-switching transients, and lightning-induced surges.
For engineers reviewing the SMDJ26CA datasheet, SMDJ26CA pinout, SMDJ26CA application, or SMDJ26CA equivalent, key selection criteria include its bidirectional configuration, 3000 W peak pulse power rating, 42.1 V clamping voltage at 71.3 A, -55 °C to +175 °C operating junction temperature, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity.
Technical Context
The SMDJ26CA is a single-die, bidirectional TVS diode designed for high-energy transient suppression in DC power rails and signal lines. Its glass-passivated junction ensures stable breakdown behavior, while its sub-1 ps response time enables effective clamping before sensitive downstream components are exposed to overvoltage.
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 SMT layouts. The device meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin. |
| VBR @ IT=1 mA | 28.9–31.9 V - Measured breakdown threshold at 1 mA test current; confirms bidirectional conduction onset. |
| VC @ IPPM=71.3 A | 42.1 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on protected ICs. |
| PPK | 3000 W - Peak pulse power handling per ISO 7637-2-compliant transient; supports high-energy automotive/load-switch events. |
| TJ Range | -55 °C to +175 °C - Full industrial and under-hood automotive operating range without derating. |
| Package | DO-214AB (SMC) - Standardized 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) is a two-terminal, polarity-marked surface-mount package. Cathode band marking applies only to unidirectional variants; SMDJ26CA is bidirectional and has no functional polarity-both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no PCB orientation dependency. |
| Case (body) | Thermal and mechanical interface | Exposed copper slug provides primary heat path to PCB copper; requires adequate thermal pad area per JEDEC MO-214AC. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage over lifetime and temperature; eliminates parameter drift due to surface contamination. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive-level transient immunity-enables direct use in 12 V/24 V vehicle ECUs without additional filtering. |
| Sub-1 ps response time | Clamps transients before propagation into IC inputs; critical for protecting high-speed interfaces like CAN FD or Ethernet PHYs. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without process modification or dry-pack handling. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIOs and LIN bus transceivers from battery dump and load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point before ESD protection diodes and signal conditioning. Use Value: Limits voltage to ≤42.1 V during 3000 W pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Shields 24 V digital input optocouplers from inductive kickback when switching solenoids or relays in factory automation. IC Role / Device Role / Timing Role: Primary surge shunt located between field-side terminal block and isolation barrier, absorbing energy before it reaches upstream isolators. Use Value: Handles 71.3 A peak current at 42.1 V clamp, eliminating need for series impedance or RC snubbers in high-noise environments. |
| Telecom Power Supply Front-End | Consumer Smart Meter AC/DC Interface |
Use Scenario: Guards primary-side controller ICs and MOSFET gates against lightning-induced surges on 48 V telecom rectifier outputs. IC Role / Device Role / Timing Role: High-power crowbar device mounted adjacent to bulk capacitor, diverting surge energy away from PWM controllers and feedback networks. Use Value: Withstands 3000 W peak power without degradation, maintaining regulation integrity during repeated 10/1000 µs line surges. | Use Scenario: Suppresses fast transients coupled onto meter's 230 V AC input via EMI filters and varistors during grid switching events. IC Role / Device Role / Timing Role: Secondary-stage clamping device after MOV, providing precise voltage limiting for low-voltage auxiliary supply rectifiers. Use Value: 26 V working voltage aligns with 24 V DC bias rails, enabling tighter clamping than higher-VWM alternatives and reducing stress on downstream LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC26CA (Littelfuse) | Same VWM (26 V), slightly higher VC (43.5 V @ 70 A); 2500 W PPK; DO-214AB package. | Limited to lower-energy transients; not rated for ISO 7637-2 Pulse 5a (load dump). | Prefer SMDJ26CA where full 3000 W capability and automotive standard compliance are required. |
| SMCJ26CA (ON Semiconductor) | Identical VWM, VBR, VC, and PPK; same DO-214AB package; meets ISO 7637-2. | No functional difference; validated drop-in replacement with identical thermal and electrical performance. | SMCJ26CA offers second-source availability but shares identical design constraints and layout requirements as SMDJ26CA. |
Compared with SAC26CA and SMCJ26CA, the SMDJ26CA delivers full 3000 W surge capacity and explicit ISO 7637-2 certification-critical for automotive and industrial designs requiring guaranteed immunity to worst-case load-dump and coupling events-while maintaining identical PCB footprint and thermal interface requirements.
Availability
SMDJ26CA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection, telecom power front-ends, and smart meter AC/DC interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ26CA 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-reliability, high-power transient suppression in automotive and industrial environments-emphasizing robustness, standardized packaging, and compliance with stringent EMC and safety standards.
FAQ
What is the maximum clamping voltage of the SMDJ26CA under standard test conditions?
The SMDJ26CA exhibits a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 71.3 A at TA = 25 °C. This value is measured across both terminals during bidirectional conduction and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the SMDJ26CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMDJ26CA is explicitly tested and rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its 3000 W peak power rating, fast sub-1 ps response, and specified clamping behavior make it appropriate for protecting ECUs, BCMs, and infotainment systems in 12 V and 24 V vehicle architectures.
Does the SMDJ26CA have polarity markings, and how should it be oriented on the PCB?
No-the SMDJ26CA is a bidirectional TVS diode and carries no cathode band or polarity marking. Both terminals are functionally identical, allowing unrestricted PCB orientation. Unlike unidirectional variants (e.g., SMDJ26A), it conducts symmetrically in either direction, simplifying layout and eliminating orientation errors during automated assembly.
What is the junction-to-ambient thermal resistance (RθJA) of the SMDJ26CA, and how does it affect PCB layout?
The SMDJ26CA has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W under standard JEDEC test conditions. To maintain TJ ≤ 175 °C during repetitive surges, the PCB must provide sufficient copper area-typically ≥ 100 mm² of 2 oz. copper connected to both terminals-to dissipate heat effectively and avoid thermal runaway.
How does the SMDJ26CA compare to the SMDJ26A in terms of electrical behavior and application use?
The SMDJ26CA is bidirectional with symmetrical clamping in both directions, while the SMDJ26A is unidirectional and conducts only in reverse bias. The SMDJ26CA is used where AC-coupled signals, floating grounds, or dual-polarity rails require protection without polarity constraints; the SMDJ26A suits DC-only lines with defined anode/cathode routing. Both share identical VWM, VBR, and PPK ratings.
SMDJ26CA 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 71.3A
- 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)
SMDJ26CA FAQ
1.How can I place an order for SMDJ26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ26CA 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 SMDJ26CA reliable?
The price and inventory of SMDJ26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ26CA is usually 5 days.
3.What payment methods are accepted for SMDJ26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ26CA?
SMDJ26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ26CA 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 SMDJ26CA?
For technical support, including SMDJ26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ26CA requirements.
6.How does Aetrix verify that SMDJ26CA is sourced from the original manufacturer or authorized distributors?
All SMDJ26CA 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 SMDJ26CA meets industry standards.
7.What is the process for return or replacement of SMDJ26CA?
All SMDJ26CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ26CA, 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 SMDJ26CA part is unused and in its original packaging.
Return procedure for SMDJ26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ26CA Tags
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