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Vishay General Semiconductor - Diodes Division SMCJ26A-M3/9AT
- Part No.:
- SMCJ26A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ26A-M3/9AT.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,409
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Product details
Overview
SMCJ26A-M3/9AT 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 at 1 mA, 42.1 V clamping voltage at 35.6 A peak pulse current (10/1000 μs), and 1500 W peak pulse power rating - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ26A-M3/9AT datasheet, SMCJ26A-M3/9AT pinout, SMCJ26A-M3/9AT application, or SMCJ26A-M3/9AT equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant construction (M3 suffix), 1500 W surge capability, and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads per terminal.
Technical Context
The SMCJ26A-M3/9AT operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR threshold, diverting transient energy to ground while limiting downstream voltage to ≤42.1 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at 26 V) and fast response time (<1 ns), critical for protecting sensitive MOSFET gates and microcontroller I/O pins against ESD and inductive switching spikes.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and supports peak forward surge current of 200 A (8.3 ms half-sine), making it suitable for high-energy transients in 12 V/24 V automotive and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 mA | 28.9–31.9 V - Breakdown voltage range ensuring consistent turn-on across production lot |
| VC @ IPPM | 42.1 V - Clamped voltage at 35.6 A peak pulse current, defining worst-case protected node voltage |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform, supporting IEC 61000-4-5 Level 4 compliance |
| IPPM | 35.6 A - Maximum non-repetitive surge current under standardized test conditions |
| TJ max. | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-power density layout |
Pinout & Package
SMCJ26A-M3/9AT uses the SMC (DO-214AB) package: a two-terminal, surface-mount plastic case with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band on the body end; the banded terminal is cathode (anode is unmarked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to system ground or low-impedance return path to shunt surge energy away from protected IC |
| Anode (unmarked end) | Protected line input | Connected to the line being safeguarded (e.g., 24 V supply rail or CAN_H signal trace) |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge performance |
| 1500 W peak pulse power rating | Supports robust protection against severe transients including ISO 7637-2 Pulse 5a (load dump) in 24 V systems |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving margin for 3.3 V/5 V logic interfaces |
| MSL Level 1 moisture sensitivity | Enables standard reflow processing without baking, reducing manufacturing complexity and cost |
| 150 °C maximum junction temperature | Allows placement near heat sources (e.g., power inductors, MOSFETs) in compact industrial power modules |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protecting 24 V sensor supply lines from load-dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp surges up to 120 V. Use Value: Limits voltage seen by downstream LDO regulators and microcontroller analog inputs to ≤42.1 V, preventing latch-up or permanent damage. | Use Scenario: Safeguarding 24 V digital input optocoupler circuits from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the input side of isolated 24 V-to-5 V signal conditioning stage. Use Value: Ensures reliable operation under IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) testing without derating or additional series impedance. |
| Telecom Power Supply Front-End | Motor Drive Gate Driver Protection |
Use Scenario: Shielding primary-side DC bus (e.g., 48 V telecom rectifier output) from lightning-induced surges on AC input lines. IC Role / Device Role / Timing Role: Secondary-stage TVS after MOV-based front-end filtering, providing precise clamping where MOV tolerance is insufficient. Use Value: Delivers tighter voltage control (±1.5 V VBR tolerance) than MOVs, preserving headroom for downstream DC-DC converters. | Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFETs due to Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS connected between gate and source terminals. Use Value: Responds in <1 ns to limit gate-source voltage to safe levels (<20 V), avoiding unintended turn-on or dielectric breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass) | Not suitable for 1500 W surge events; limited to low-energy ESD or signal-line protection | Select only for space-constrained, low-power signal paths where 400 W rating suffices |
| SMCJ26CA-M3/9AT | Bidirectional variant with same VWM, VBR, and PPPM; symmetric clamping in both polarities | Required for AC-coupled or differential lines (e.g., RS-485, CAN) where polarity reversal occurs | Choose when protecting bidirectional data lines or floating references where unidirectional polarity is invalid |
Compared with SMAJ26A-E3/61T and SMCJ26CA-M3/9AT, the SMCJ26A-M3/9AT provides optimal balance of high-energy surge handling, unidirectional polarity, and halogen-free compliance - making it the preferred choice for 24 V DC power rail protection in automotive and industrial control systems requiring AEC-Q101 alignment and long-term reliability.
Availability
SMCJ26A-M3/9AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, halogen-free compliance, and 1500 W transient immunity.
Supply support for SMCJ26A-M3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh-environment applications including automotive power distribution, industrial automation, and infrastructure power systems.
FAQ
What is the clamping voltage of the SMCJ26A-M3/9AT at its rated peak pulse current?
The SMCJ26A-M3/9AT has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 35.6 A, measured using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated transient event and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMCJ26A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Does the SMCJ26A-M3/9AT meet automotive qualification standards?
The SMCJ26A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix) but is not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the SMCJ26A-HM3_X variant (e.g., SMCJ26A-HM3_A/I), which carries the HM3 suffix and explicit AEC-Q101 certification. The SMCJ26A-M3/9AT remains suitable for non-qualified automotive subsystems where robustness and compliance are prioritized but formal qualification is not mandated.
How does the SMCJ26A-M3/9AT differ from the bidirectional SMCJ26CA-M3/9AT?
The SMCJ26A-M3/9AT is unidirectional, with polarity indicated by a cathode band and intended for DC line protection where current flows in one direction. In contrast, the SMCJ26CA-M3/9AT is bidirectional, offering symmetric clamping for AC or differential signals like RS-485 or CAN bus. Both share identical VWM (26 V), VBR, PPPM (1500 W), and package, but the SMCJ26A-M3/9AT cannot replace the CA version in bidirectional applications without risking improper clamping behavior.
What is the thermal resistance of the SMCJ26A-M3/9AT, and how does it affect PCB layout?
The SMCJ26A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe junction temperatures under repeated surges, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in the datasheet. Reducing pad size increases RθJA, risking thermal runaway during high-duty-cycle transients - a critical consideration in motor drive or power supply designs where the SMCJ26A-M3/9AT may experience multiple surges.
Can the SMCJ26A-M3/9AT be used in place of a Zener diode for overvoltage protection?
The SMCJ26A-M3/9AT is not a substitute for a Zener diode in precision voltage regulation or low-power reference applications. It is engineered exclusively for transient suppression - conducting only during high-energy, short-duration events (e.g., 10/1000 μs surges). Unlike Zeners, it exhibits higher leakage above VWM and lacks tight voltage tolerance for steady-state biasing. For sustained overvoltage limiting, a dedicated crowbar circuit or regulator IC should be used alongside the SMCJ26A-M3/9AT, not instead of it.
SMCJ26A-M3/9AT 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 (SMC)
SMCJ26A-M3/9AT FAQ
1.How can I place an order for SMCJ26A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ26A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ26A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ26A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ26A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ26A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ26A-M3/9AT?
SMCJ26A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ26A-M3/9AT 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-M3/9AT?
For technical support, including SMCJ26A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ26A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ26A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ26A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ26A-M3/9AT?
All SMCJ26A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ26A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ26A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ26A-M3/9AT Tags
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