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Taiwan Semiconductor Corporation SMCJ26A
- Part No.:
- SMCJ26A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
SMCJ26A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 26V working stand-off voltage (VWM), 28.9–31.9V breakdown voltage (VBR), and 42.1V maximum clamping voltage (VC) at 37A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails and DC input stages.
For engineers reviewing the SMCJ26A datasheet, SMCJ26A pinout, SMCJ26A application, or SMCJ26A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability industrial and automotive PCBs.
Technical Context
The SMCJ26A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (28.9–31.9V at 1mA test current), clamping transients to ≤42.1V at 37A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA at 26V).
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 42.1 V - Clamped voltage during 37 A 10/1000 μs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive event (1 ms) |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature, enabling use in under-hood automotive environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking and 0.210 g mass |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; compatible with JEDEC-standard SMT reflow profiles and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures consistent VBR tolerance and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated for automotive electrical transient immunity (Pulse 1/2a/2b/3a/3b) |
| Fast response time | <1.0 ps rise from 0 V to VBR min - limits voltage overshoot before clamping engages |
| MSL Level 1 rating | Unlimited floor life at ≤30°C/60% RH - eliminates bake requirements before SMT assembly |
| Halogen-free construction | Complies with IEC 61249-2-21 - supports RoHS-compliant and environmentally regulated designs |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-fed control modules exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤42.1V during 37A surges, preventing latch-up or gate oxide damage in downstream 3.3V/5V logic. | Use Scenario: Digital input terminals of programmable logic controllers receiving 24V sensor signals in factory automation. IC Role / Device Role / Timing Role: Standoff protection device absorbing EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid drivers. Use Value: Maintains signal integrity by suppressing >1kV transients while drawing <1μA leakage at nominal 24V operation. |
| LED Driver Surge Suppression | Telecom DC Feeder Protection |
Use Scenario: Constant-current LED drivers powered from 24–48V supplies subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary clamping element on input stage, coordinated with upstream fuses and common-mode chokes. Use Value: Absorbs 1500W peak pulses without degradation, preserving driver MOSFETs and current-sense amplifiers. | Use Scenario: -48V DC power feeders in telecom base stations exposed to induced surges from nearby AC mains or antenna coupling. IC Role / Device Role / Timing Role: Reverse-polarity-protected clamping diode on the negative rail, referenced to system ground. Use Value: Withstands repeated 10/1000μs surges up to 37A while maintaining <1μA leakage - critical for low-power monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A | 600W PPK rating, same VWM/VBR/VC but lower IPPM (21A vs. 37A), DO-214AA (SMB) package | Lower energy handling; suitable for less severe transients or space-constrained layouts where 1500W is unnecessary | Select SMBJ26A only if system-level testing confirms 600W clamping energy suffices and board area is limited. |
| SMCJ26CA | Bidirectional variant (CA suffix), identical VWM/VBR/VC specs but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus) | Choose SMCJ26CA only when bidirectional protection is mandated - unidirectional SMCJ26A offers lower capacitance and cost for DC rails. |
Compared with SMBJ26A, the SMCJ26A delivers 2.5× higher surge energy absorption in the same footprint family; versus SMCJ26CA, it provides optimized unidirectional clamping with reduced parasitic capacitance for DC power applications.
Availability
SMCJ26A is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and telecom power supplies requiring stable component supply across extended production lifecycles.
Supply support for SMCJ26A 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 SMCJ series is part of TSC's high-power transient suppression product line, engineered specifically for robust ISO 7637-2 and IEC 61000-4-5 compliance in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMCJ26A at its rated peak pulse current?
The SMCJ26A has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPPM) of 37 A under the standard 10/1000 μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ26A maintains this clamping performance consistently due to its glass-passivated junction and controlled avalanche characteristics.
Is SMCJ26A unidirectional or bidirectional, and how is polarity identified?
The SMCJ26A is a unidirectional TVS diode, intended for DC line protection where reverse voltage is not expected. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 24V rail), while the anode connects to ground. This configuration ensures conduction only during positive overvoltage transients relative to ground.
Does SMCJ26A meet automotive transient immunity standards?
Yes, the SMCJ26A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), and Pulses 3a/3b (switching noise), as confirmed in Taiwan Semiconductor's official documentation. Its 1500W peak power rating and fast sub-picosecond response enable reliable suppression of these standardized automotive transients without degradation.
What is the maximum junction temperature and thermal resistance of SMCJ26A?
The SMCJ26A has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJC = 10°C/W (junction-to-case) and RθJA = 55°C/W (junction-to-ambient). These values allow the SMCJ26A to sustain repeated surge events in high-temperature environments such as engine control units or industrial motor drives, provided PCB copper area and airflow meet recommended layout guidelines.
How does SMCJ26A differ from SMCJ26 (non-A version)?
The SMCJ26A offers tighter breakdown voltage tolerance (28.9–31.9 V) compared to the standard SMCJ26 (28.9–35.3 V), resulting in more predictable clamping onset and reduced variation in system-level surge margin. Both share identical package (DO-214AB), power rating (1500 W), and clamping voltage (42.1 V vs. 46.6 V), but the "A" suffix denotes enhanced VBR consistency critical for high-reliability designs.
SMCJ26A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 35.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ26A FAQ
1.How can I place an order for SMCJ26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ26A 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 SMCJ26A reliable?
The price and inventory of SMCJ26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ26A is usually 5 days.
3.What payment methods are accepted for SMCJ26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ26A?
SMCJ26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ26A 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 SMCJ26A?
For technical support, including SMCJ26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ26A requirements.
6.How does Aetrix verify that SMCJ26A is sourced from the original manufacturer or authorized distributors?
All SMCJ26A 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 SMCJ26A meets industry standards.
7.What is the process for return or replacement of SMCJ26A?
All SMCJ26A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ26A, 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 SMCJ26A part is unused and in its original packaging.
Return procedure for SMCJ26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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