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Taiwan Semiconductor Corporation SMDJ26A
- Part No.:
- SMDJ26A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,736
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Product details
Overview
SMDJ26A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 26 V, breakdown voltage range 28.9–31.9 V, and clamping voltage of 42.1 V at 71.3 A peak pulse current. It is designed for ESD and surge protection in DC power rails and signal lines of industrial control systems, automotive electronics, and telecom infrastructure.
For engineers reviewing the SMDJ26A datasheet, SMDJ26A pinout, SMDJ26A application, or SMDJ26A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, 175 °C maximum junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMDJ26A operates as a single-die, unidirectional avalanche diode optimized for high-energy transients. Its glass-passivated junction ensures stable clamping performance under repeated surges, while its thermal resistance (RθJA = 75 °C/W, RθJL = 15 °C/W) supports reliable operation up to 175 °C junction temperature.
It delivers 3000 W peak pulse power (10/1000 µs waveform), clamps at 42.1 V when subjected to 71.3 A peak impulse current, and exhibits ≤1 µA reverse leakage at 26 V - enabling low-power standby integrity in protected circuits without compromising efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR @ IT=1 mA | 28.9–31.9 V - Breakdown threshold range; ensures consistent avalanche initiation across production lots. |
| VC @ IPPM=71.3 A | 42.1 V - Clamped voltage during 3000 W transient; determines maximum stress on downstream ICs. |
| PPK | 3000 W - Peak pulse power rating (10/1000 µs); qualifies for ISO 7637-2 Pulse 1, 2a, 2b, 3a, 3b immunity testing. |
| IR @ VWM | ≤1 µA - Reverse leakage at rated stand-off; preserves battery life and low-power sleep modes. |
| TJ max | +175 °C - Maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| Response time | <1.0 ps - Avalanche turn-on speed; limits voltage overshoot during fast ESD events (IEC 61000-4-2). |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, JEDEC-compliant solderability (J-STD-002), moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms current sink during clamping. |
| Cathode (banded end) | High-side connection point | Connected to protected line (e.g., 24 V rail); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) without external filtering. |
| DO-214AB (SMC) package | Enables automated placement and reflow compatibility; footprint matches industry-standard SMC land pattern (JEDEC DO-214AB). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive; suitable for environmentally regulated industrial and automotive supply chains. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against induced surges from relay coil flyback and nearby motor switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between field input and optocoupler input, shunting transients before they reach isolation barrier. Use Value: Limits voltage to ≤42.1 V during 3000 W pulses, preserving optocoupler CTR and preventing false triggering or latch-up. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in door modules exposed to battery disconnect spikes and alternator load dump. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and LIN data line, absorbing ISO 7637-2 Pulse 2b (inductive switch-off) energy. Use Value: Maintains <1 µA leakage at 12 V nominal, avoiding quiescent current violations while clamping to 42.1 V within <1 ps. |
| Telecom Power Supply Input | Factory Automation Sensor Interface |
Use Scenario: Front-end protection of 24 V DC-DC converters in base station remote radio units subjected to lightning-induced surges on outdoor power feeds. IC Role / Device Role / Timing Role: Primary surge suppression stage before input filter and converter IC; sized for 3000 W peak power per IEC 61000-4-5 Level 4. Use Value: Withstands 71.3 A peak current at 42.1 V clamping, reducing downstream filter component stress and enabling smaller bulk capacitor sizing. | Use Scenario: Shielding analog sensor signal conditioning circuits (e.g., 4–20 mA loop receivers) from ESD and cable discharge events in robotic arm joints. IC Role / Device Role / Timing Role: Low-leakage TVS on signal line inputs, placed adjacent to connector to minimize inductance and overshoot. Use Value: Sub-1 ps response prevents >42.1 V excursion during 8 kV contact ESD (IEC 61000-4-2), protecting precision op-amps and ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC26A (Littelfuse) | Same DO-214AB package; VWM = 26 V, VC = 42.1 V, PPK = 3000 W - identical electrical specs. | No functional difference; validated for same ISO 7637-2 and IEC 61000-4-2 test profiles. | Select SAC26A if dual-sourcing or Littelfuse qualification is required in automotive Tier-1 BOMs. |
| 1.5SMC26A (ON Semiconductor) | VWM = 26 V, VC = 42.1 V, PPK = 3000 W, but RθJA = 80 °C/W (vs. 75 °C/W for SMDJ26A); slightly lower thermal efficiency. | Same clamping performance, but higher junction temperature rise under sustained surge duty cycles. | Prefer SMDJ26A for high-ambient or thermally constrained layouts; 1.5SMC26A acceptable where board-level cooling is robust. |
Compared with SAC26A and 1.5SMC26A, the SMDJ26A offers identical clamping and power ratings but superior thermal resistance (75 °C/W), enabling higher reliability in compact, sealed enclosures or extended temperature operation without derating.
Availability
SMDJ26A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power supply input stages requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMDJ26A 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 for industrial and automotive markets.
The SMDJ series is engineered specifically for high-reliability transient suppression in harsh environments - emphasizing low leakage, stable clamping, and robust packaging for ISO 7637-2 and IEC 61000-4-5 compliance.
FAQ
What is the maximum clamping voltage of the SMDJ26A under standard test conditions?
The SMDJ26A has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 µs peak pulse current of 71.3 A. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during a 3000 W transient event. The SMDJ26A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMDJ26A suitable for bidirectional transient protection?
No, the SMDJ26A is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, the SMDJ26CA variant must be used - it features symmetrical breakdown in both directions and shares the same DO-214AB package. The SMDJ26A's cathode band marking indicates strict anode-to-ground orientation; reverse connection risks permanent failure.
Does the SMDJ26A meet automotive EMC standards such as ISO 7637-2?
Yes, the SMDJ26A is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms. Its 3000 W peak power rating, fast <1 ps response, and stable clamping enable direct integration into automotive BCM, infotainment, and ADAS subsystems without supplemental filtering - provided layout follows recommended pad geometry and grounding practices per the SMDJ26A datasheet.
What is the thermal resistance specification for the SMDJ26A, and how does it affect PCB layout?
The SMDJ26A has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values assume standard JEDEC 2-layer board conditions. To maintain TJ ≤ 175 °C during repetitive surges, designers must provide adequate copper pour on both sides connected to the SMDJ26A pads - especially under the tab area - as specified in the DO-214AB suggested pad layout in the SMDJ26A datasheet.
Can the SMDJ26A be used in place of the older SMAJ26A in existing designs?
The SMDJ26A is not a drop-in replacement for SMAJ26A due to differing packages: SMDJ26A uses DO-214AB (SMC), while SMAJ26A uses DO-214AC (SMA). Though both are unidirectional 26 V TVS diodes, their footprints, thermal performance, and surge current handling differ. Replacing SMAJ26A with SMDJ26A requires PCB layout revision to accommodate the larger SMC pad dimensions and leverage its higher 3000 W rating - the SMDJ26A itself remains fully functional once correctly mounted.
SMDJ26A 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:
- 1
- Bidirectional Channels:
- -
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ26A FAQ
1.How can I place an order for SMDJ26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ26A 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 SMDJ26A reliable?
The price and inventory of SMDJ26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ26A is usually 5 days.
3.What payment methods are accepted for SMDJ26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ26A?
SMDJ26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ26A 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 SMDJ26A?
For technical support, including SMDJ26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ26A requirements.
6.How does Aetrix verify that SMDJ26A is sourced from the original manufacturer or authorized distributors?
All SMDJ26A 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 SMDJ26A meets industry standards.
7.What is the process for return or replacement of SMDJ26A?
All SMDJ26A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ26A, 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 SMDJ26A part is unused and in its original packaging.
Return procedure for SMDJ26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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