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Vishay General Semiconductor - Diodes Division SMAJ26A-M3/5A
- Part No.:
- SMAJ26A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26A-M3/5A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,647
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Product details
Overview
SMAJ26A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on power and signal lines. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤42.1 V at 9.5 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive power supply rails and industrial sensor interfaces to suppress ESD and load-switching surges.
For engineers reviewing the SMAJ26A-M3/5A datasheet, SMAJ26A-M3/5A pinout, SMAJ26A-M3/5A application, or SMAJ26A-M3/5A equivalent, this page provides verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal resistance data (RθJA = 120 °C/W), and AEC-Q101-qualified alternatives for automotive-grade design validation.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast transient response (<1 ps typical) and low incremental surge resistance. Its glass-passivated junction ensures stable breakdown characteristics across temperature (−55 °C to +150 °C) and repeatable clamping performance under repetitive 0.01% duty-cycle surges.
The SMAJ26A-M3/5A uses a DO-214AC (SMA) package with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak, making it suitable for high-volume automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤42.1 V at 9.5 A - Clamping voltage limits downstream IC stress during 10/1000 μs transients. |
| PPPM | 400 W - Peak pulse power rating with 10/1000 μs waveform; derates above 25 °C per Fig. 2. |
| IFSM | 40 A - Peak forward surge current capability (8.3 ms half-sine) supports unidirectional power rail protection. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance determines required PCB copper area for sustained power dissipation. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with molded UL 94 V-0 compound. Cathode identified by a band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line side; conducts during forward surge or DC bias conditions. |
| Cathode | Reverse-biased clamping node | Connected to ground or lower-potential rail; initiates avalanche conduction when VWM is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables suppression of high-energy transients from inductive switching in 12 V/24 V systems without degradation. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving system immunity. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge robustness. |
| AEC-Q101 qualified option available | Supports qualification path for automotive applications via HM3 suffix variants (e.g., SMAJ26AHM3_X). |
| MSL Level 1, 260 °C reflow compatible | Eliminates pre-bake requirements and supports standard lead-free SMT processes without popcorn risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges >35 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤42.1 V, preventing latch-up or gate oxide damage. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) from ESD and field wiring transients. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return lines to shunt fast transients. Use Value: Maintains signal integrity with <10 pF junction capacitance at VWM, avoiding bandwidth degradation. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side surge protection in AC/DC adapters subjected to lightning-induced surges on DC output. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing energy from coupled transients before reaching USB-PD controllers. Use Value: Withstands 400 W pulses without failure, enabling compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω). |
Use Scenario: Protecting PoE-powered devices (IEEE 802.3af/at) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Unidirectional clamping device on each powered pair to limit common-mode overvoltage. Use Value: Clamps to ≤42.1 V within nanoseconds, preserving PHY IC reliability while meeting Telcordia GR-1089-CORE surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26AHM3_X | AEC-Q101 qualified; identical electrical specs; halogen-free, RoHS-compliant; includes revision code (e.g., A, B). | Required for automotive production programs needing PPAP documentation and long-term reliability validation. | Select when automotive qualification and traceable lifecycle management are mandatory. |
| SMBJ26A-M3 | Same VWM/VBR/VC, but SMB (DO-214AA) package: 2.54 mm lead pitch vs. SMA's 2.29 mm; 600 W PPPM. | Higher power handling suits higher-energy surge environments; larger footprint requires PCB layout change. | Choose for enhanced surge margin where board space permits larger package and higher 600 W rating is needed. |
Compared with SMAJ26A-M3/5A, SMAJ26AHM3_X adds automotive qualification without altering electrical behavior, while SMBJ26A-M3 increases peak power capacity at the cost of larger footprint and non-drop-in placement-neither is pin-compatible due to differing package outlines and terminal spacing.
Availability
SMAJ26A-M3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power interface designs requiring stable component supply, consistent M3 environmental compliance, and reliable surge immunity performance.
Supply support for SMAJ26A-M3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-including automotive, industrial, and telecom-delivering consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the SMAJ26A-M3/5A under a 10/1000 μs surge?
The SMAJ26A-M3/5A clamps to a maximum of 42.1 V when subjected to its rated peak pulse current of 9.5 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 0.2" × 0.2" copper pads per JEDEC guidelines. The SMAJ26A-M3/5A maintains this clamping performance across its full operating temperature range, ensuring predictable protection margins in real-world deployments.
Is the SMAJ26A-M3/5A suitable for automotive applications?
The SMAJ26A-M3/5A itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ26AHM3_X variant with full AEC-Q101 qualification, halogen-free construction, and RoHS compliance. For automotive use, specify the HM3_X suffix version-SMAJ26A-M3/5A remains appropriate for non-automotive industrial or consumer applications where qualification is not mandated.
What does the "M3" suffix indicate in SMAJ26A-M3/5A?
The "M3" suffix denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, with matte tin-plated leads qualified per JESD 201 Class 2 whisker testing. It also indicates compliance with Vishay's material categorization standard (www.vishay.com/doc?99912). The "/5A" denotes packaging in 13" diameter tape-and-reel format with 7500 units per reel.
How does the SMAJ26A-M3/5A compare to bidirectional TVS diodes like SMAJ26CA?
The SMAJ26A-M3/5A is unidirectional and intended for DC circuits where polarity is fixed-its cathode must be tied to ground or the lower-potential rail. In contrast, SMAJ26CA is bidirectional and symmetric, suitable for AC lines or differential signals without polarity constraints. Both share identical VWM, VBR, and VC ratings, but SMAJ26A-M3/5A exhibits forward conduction capability (IFSM = 40 A), whereas SMAJ26CA does not conduct in forward bias.
What PCB layout considerations apply to the SMAJ26A-M3/5A for optimal thermal performance?
To achieve the specified RθJA = 120 °C/W, mount the SMAJ26A-M3/5A on minimum recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with no thermal relief. Use internal ground/power planes connected via multiple vias to enhance heat spreading. Avoid narrow traces or isolated pads, as these increase thermal resistance and reduce surge endurance-especially critical during repetitive transient events.
SMAJ26A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 9.5A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ26A-M3/5A FAQ
1.How can I place an order for SMAJ26A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26A-M3/5A 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 SMAJ26A-M3/5A reliable?
The price and inventory of SMAJ26A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ26A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26A-M3/5A?
SMAJ26A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26A-M3/5A 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 SMAJ26A-M3/5A?
For technical support, including SMAJ26A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26A-M3/5A requirements.
6.How does Aetrix verify that SMAJ26A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ26A-M3/5A 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 SMAJ26A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ26A-M3/5A?
All SMAJ26A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26A-M3/5A, 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 SMAJ26A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ26A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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