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Vishay General Semiconductor - Diodes Division SMCJ26A-E3/9AT
- Part No.:
- SMCJ26A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ26A-E3/9AT.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:10,273
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Product details
Overview
SMCJ26A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown range (VBR at 1 mA), 42.1 V clamping voltage (VC) at 35.6 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ26A-E3/9AT datasheet, SMCJ26A-E3/9AT pinout, SMCJ26A-E3/9AT application, or SMCJ26A-E3/9AT equivalent, key selection criteria include clamping performance under 35.6 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ26A-E3/9AT operates as a silicon avalanche diode that enters controlled breakdown above its VWM to shunt transient energy away from protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at 26 V) and fast response time (<1 ns), while low incremental surge resistance enables effective clamping during high-current transients such as ISO 7637-2 load dump pulses.
Thermally, it supports operation from −55 °C to +150 °C junction temperature, with derating applied above 25 °C ambient per Figure 2. The device meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C) and is rated for 200 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for both primary and secondary protection stages in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant conduction begins; defines upper limit of normal system operating range. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Verified breakdown threshold range; ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 42.1 V at 35.6 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs during transient events. |
| PPPM | 1500 W - Peak pulse power handling capability; defines survivability against standardized lightning or ESD-like surges. |
| IPPM | 35.6 A - Peak pulse current supported at VC; directly correlates with surge immunity level per IEC 61000-4-5. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended 8.0 mm × 8.0 mm copper pads; critical for sustained power dissipation planning. |
| TJ max | +150 °C - Maximum allowable junction temperature; sets upper bound for thermal design margin in enclosed or high-ambient environments. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for reverse-biased operation | Connected to protected line (e.g., +12 V rail); conducts when transient exceeds VWM, diverting current to ground. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping path during overvoltage event; must maintain low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump) without external series impedance. |
| Clamping voltage ≤42.1 V at 35.6 A | Ensures downstream 3.3 V/5 V logic and microcontrollers remain within absolute maximum ratings during surge events. |
| Glass passivated junction | Provides stable VBR tolerance, low leakage (<1.0 µA), and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling; compatible with high-volume manufacturing. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental regulations; no halogen restrictions apply-suitable for consumer, industrial, and telecom applications. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Primary clamping element placed between input rail and ground, acting as fast-acting shunt limiter. Use Value: Limits peak voltage to ≤42.1 V during 35.6 A surges, preventing damage to upstream DC/DC converters and MCU power supplies. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Secondary-level TVS placed at connector interface to absorb fast-rising transients before they reach precision amplifiers or transceivers. Use Value: Sub-1 ns response and <1.0 µA leakage preserve signal integrity and measurement accuracy while meeting IEC 61000-4-2 Level 4 (15 kV air). |
| Telecom DC Power Feeds | Consumer Equipment AC/DC Adapter Outputs |
|
Use Scenario: Securing −48 V telecom power distribution boards against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to −48 V rail, anode to chassis ground, providing bidirectional surge suppression via system grounding scheme. Use Value: 1500 W rating and 75 °C/W thermal resistance allow sustained operation in dense, convection-cooled telecom shelves without forced airflow. |
Use Scenario: Adding robustness to USB-C PD and legacy 5 V/12 V adapter outputs exposed to accidental short-circuits and cable coupling events. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp after DC/DC regulation, ensuring safe voltage delivery to connected peripherals. Use Value: Tight VBR tolerance (±5.2%) and low clamping ratio (VC/VWM = 1.62) minimize risk of false triggering while maintaining safety margin. |
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-E3/52T | Same VWM/VC specs but in smaller SMB (DO-214AA) package; lower PPPM (600 W); RθJA = 110 °C/W. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or lightning surge where 1500 W is required. | Select only if board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4, not ISO 7637-2. |
| SMCJ26CA-E3/9AT | Bidirectional variant; identical VWM/VC but symmetric clamping in both polarities; same 1500 W rating and SMC package. | Required for AC-coupled lines or floating references where polarity reversal may occur (e.g., RS-485, audio lines). | Choose when protecting bidirectional signals or ungrounded circuits; otherwise unidirectional SMCJ26A-E3/9AT offers better cost and layout simplicity. |
Compared with SMBJ26A-E3/52T, the SMCJ26A-E3/9AT delivers 2.5× higher surge power handling and superior thermal performance for demanding automotive and industrial use cases; versus SMCJ26CA-E3/9AT, it provides optimized cost and efficiency for fixed-polarity DC rails where bidirectional clamping is unnecessary.
Availability
SMCJ26A-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power systems requiring stable component supply, consistent RoHS compliance, and full traceability through Vishay's authorized channel.
Supply support for SMCJ26A-E3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, ruggedness, and application-specific qualification.
The SMCJ26A-E3/9AT belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust transient suppression in automotive, industrial, and communications infrastructure where failure modes must be mitigated without compromising signal fidelity or thermal stability.
FAQ
What is the clamping voltage of the SMCJ26A-E3/9AT at its rated peak pulse current?
The SMCJ26A-E3/9AT has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPPM) of 35.6 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge conditions. The SMCJ26A-E3/9AT maintains this clamping performance across its specified operating temperature range.
Is the SMCJ26A-E3/9AT suitable for automotive applications?
Yes, the SMCJ26A-E3/9AT is widely used in automotive electronics for power rail protection, though the base E3 suffix denotes commercial-grade qualification. For AEC-Q101 qualified versions, Vishay offers the SMCJ26AHE3_X variant (e.g., SMCJ26AHE3_A/I). The SMCJ26A-E3/9AT itself meets MSL Level 1, supports 1500 W surge handling, and operates from −55 °C to +150 °C-key requirements for under-hood and body-control module designs.
How does the SMCJ26A-E3/9AT differ from the SMCJ26CA-E3/9AT?
The SMCJ26A-E3/9AT is unidirectional, with polarity marked by a cathode band and intended for DC line protection where voltage polarity is fixed. The SMCJ26CA-E3/9AT is bidirectional, offering symmetrical clamping in both directions and no polarity marking-required for AC-coupled or floating signal paths. Both share identical VWM, VC, and PPPM ratings, but the SMCJ26A-E3/9AT is preferred for cost-sensitive, single-polarity applications like 12 V power inputs.
What is the thermal resistance of the SMCJ26A-E3/9AT, and how is it measured?
The SMCJ26A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, measured when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per JEDEC standards. This value assumes natural convection cooling and is critical for calculating steady-state temperature rise during repetitive surge events or elevated ambient conditions. Derating curves in Figure 2 of the datasheet guide safe operation above 25 °C ambient.
Does the SMCJ26A-E3/9AT require a heatsink for standard operation?
No, the SMCJ26A-E3/9AT does not require an external heatsink for transient surge suppression, as its 1500 W rating applies to non-repetitive pulses (e.g., single ESD or lightning events). However, for applications involving frequent or high-duty-cycle surges, thermal design must account for its 75 °C/W RθJA and 6.5 W steady-state power dissipation limit. PCB copper area and layout are the primary thermal management tools-not discrete heatsinks.
SMCJ26A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ26A-E3/9AT FAQ
1.How can I place an order for SMCJ26A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ26A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ26A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ26A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ26A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ26A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ26A-E3/9AT?
SMCJ26A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ26A-E3/9AT 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-E3/9AT?
For technical support, including SMCJ26A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ26A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ26A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ26A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ26A-E3/9AT?
All SMCJ26A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ26A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ26A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ26A-E3/9AT Tags
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