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Vishay General Semiconductor - Diodes Division SMAJ26CA-M3/5A
- Part No.:
- SMAJ26CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CA-M3/5A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,167
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Product details
Overview
SMAJ26CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 26 V standoff voltage (VWM), 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection circuits.
For engineers reviewing the SMAJ26CA-M3/5A datasheet, SMAJ26CA-M3/5A pinout, SMAJ26CA-M3/5A application, or SMAJ26CA-M3/5A equivalent, this device delivers verified bidirectional surge suppression, AEC-Q101-qualified reliability (via HM3 suffix), and DO-214AC package compatibility for high-volume SMT assembly in harsh environments.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the 0.097 %/°C temperature coefficient of VBR guarantees predictable clamping across -55 °C to +150 °C operating range.
The device sustains repetitive 400 W surges at 25 °C (derated above TA = 25 °C per Fig. 2), with thermal resistance RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads. Its fast response time (<1.0 ps) and low incremental surge resistance enable effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse voltage before conduction; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1.0 mA - Confirmed minimum/maximum breakdown range ensuring reliable turn-on during transients |
| VC (Clamping Voltage) | 42.1 V at 9.5 A IPPM - Peak voltage seen by protected circuit under full-rated 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability for standardized lightning/surge immunity testing |
| IPPM (Peak Pulse Current) | 9.5 A - Maximum non-repetitive surge current the device safely clamps without degradation |
| Junction Temp Range | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial control, and outdoor telecom enclosures |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (reflow peak 260 °C), UL 94 V-0 rated compound. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically - no polarity dependency; connects across protected line and ground or between differential lines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional CA construction | Enables single-device protection of AC signals, RS-485 buses, and ungrounded sensor outputs without external polarity management |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and automotive applications |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD22 standards |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) over lifetime, critical for low-power sensor front-ends |
| Halogen-free & RoHS-compliant (M3) | Complies with EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between signal line and chassis ground, responding within picoseconds to transients. Use Value: Limits induced spike voltage to ≤42.1 V, preserving integrity of 3.3 V/5 V microcontrollers and analog front-ends. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) against EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional shunt element across A/B differential pair, clamping common-mode surges without disrupting DC bias. Use Value: Maintains signal integrity under 4 kV ESD (IEC 61000-4-2) and 1 kV surge (IEC 61000-4-5), preventing transceiver latch-up. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY magnetics and DSL line drivers from lightning-induced longitudinal surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level protector mounted after gas discharge tube (GDT), handling residual energy with precise clamping. Use Value: Delivers <42.1 V clamping at 9.5 A, reducing stress on downstream TVS arrays and isolating transformers. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Across-motor terminals to absorb inductive kickback, routed to local ground plane with minimal loop inductance. Use Value: Withstands 40 A IFSM surge and 400 W PPPM, eliminating need for bulkier MOVs in space-constrained PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Suitable for commercial/industrial use where automotive reliability is not required | Select when cost sensitivity outweighs halogen-free or automotive qualification needs |
| SMBJ26CA-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VC specs | Better suited for higher-energy surge environments (e.g., factory floor mains input stages) | Choose when system-level surge testing exceeds 400 W or board layout allows larger footprint |
Compared with SMAJ26CA-M3/5A, the E3/5A variant trades halogen-free compliance and AEC-Q101 qualification for lower unit cost in non-automotive designs, while the SMBJ26CA-M3 offers enhanced energy handling in a physically larger package - neither is pin-compatible, requiring layout revision.
Availability
SMAJ26CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, and telecom line card designs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMAJ26CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-volume manufacturability.
The SMAJ series targets board-level transient protection in automotive, industrial, and telecom systems, engineered for rapid response, repeatable clamping, and compatibility with automated SMT assembly processes.
FAQ
What does the "CA" suffix indicate in SMAJ26CA-M3/5A?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ26CA-M3/5A provides symmetrical transient suppression in both polarities - ideal for protecting AC-coupled lines, differential buses like RS-485, or ungrounded sensor outputs without polarity constraints. Unlike unidirectional "A" variants, it has no cathode band marking and identical VBR in either direction.
Is SMAJ26CA-M3/5A qualified for automotive applications?
Yes - the "M3" suffix indicates halogen-free, RoHS-compliant construction, and the part is AEC-Q101 qualified when ordered with the HM3 suffix (e.g., SMAJ26CAHM3_A/I). The base SMAJ26CA-M3/5A meets commercial-grade reliability; for automotive use, specify the HM3 variant to ensure validated stress testing per JESD22 and temperature cycling protocols.
What is the maximum clamping voltage of SMAJ26CA-M3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ26CA-M3/5A is 42.1 V at 9.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and represents the highest voltage imposed on the protected circuit during full-rated surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SMAJ26CA-M3/5A replace SMAJ26A-M3/5A in a design?
No - SMAJ26CA-M3/5A is bidirectional, while SMAJ26A-M3/5A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: SMAJ26CA-M3/5A works across floating lines or differential pairs, whereas SMAJ26A-M3/5A must be oriented with cathode toward the protected IC's supply rail. Layout and schematic changes are necessary for direct replacement.
What PCB pad layout is recommended for optimal thermal performance of SMAJ26CA-M3/5A?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal to achieve the rated 400 W peak pulse power. Using smaller pads reduces thermal dissipation, derating PPPM significantly - for example, at 75 °C ambient, the device delivers only ~240 W with standard pads. Thermal vias under pads further improve RθJA in high-reliability designs.
SMAJ26CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ26CA-M3/5A FAQ
1.How can I place an order for SMAJ26CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CA-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 SMAJ26CA-M3/5A reliable?
The price and inventory of SMAJ26CA-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 SMAJ26CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ26CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CA-M3/5A?
SMAJ26CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CA-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 SMAJ26CA-M3/5A?
For technical support, including SMAJ26CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ26CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ26CA-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 SMAJ26CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ26CA-M3/5A?
All SMAJ26CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CA-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 SMAJ26CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ26CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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