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Vishay General Semiconductor - Diodes Division SMAJ26CA-E3/5A
- Part No.:
- SMAJ26CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CA-E3/5A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:14,861
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Product details
Overview
SMAJ26CA-E3/5A 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), 28.9–31.9 V breakdown range (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 sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ26CA-E3/5A datasheet, SMAJ26CA-E3/5A pinout, SMAJ26CA-E3/5A application, or SMAJ26CA-E3/5A equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on DO-214AC footprints.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or surge events: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from protected circuitry. Its bidirectional structure ensures identical clamping behavior in both polarities-critical for AC-coupled or floating signal lines.
Thermally, it uses a glass-passivated junction in an SMA (DO-214AC) package with RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The 0.01 % duty cycle rating supports repetitive surge handling only below 78 V; above that, derated to 300 W per datasheet note (1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal signal swing. |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 1 mA - Confirmed avalanche onset range; ensures consistent triggering across production lots. |
| VC @ IPPM | ≤42.1 V at 9.5 A - Clamped voltage under 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy absorption capability; defines protection level against IEC 61000-4-5 Level 3/4 surges. |
| IPPM | 9.5 A - Peak current handled at rated clamping voltage; used to size PCB trace width and grounding paths. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal design margin for high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Current entry point during positive half-cycle surge | One side of symmetrical PN junction; connects to line under protection (e.g., CAN_H or RS-485 A). |
| Cathode (Terminal 2) | Current entry point during negative half-cycle surge | Other side of symmetrical PN junction; connects to same line (bidirectional), or to ground reference if used asymmetrically. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions enables protection of AC, differential, or floating signals without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 4 kV surge testing on 2 Ω source impedance with margin. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes voltage overshoot during clamping-critical for safeguarding 3.3 V or 5 V logic interfaces. |
| AEC-Q101 qualification path | HE3/HM3 variants are qualified for automotive applications; this E3/5A variant shares identical die and construction. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking-reduces manufacturing overhead. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from load dump and ISO 7637-2 pulses in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output line and chassis ground to clamp transients before reaching microcontroller ADC input. Use Value: Prevents latch-up or damage to 5 V tolerant analog front-end ICs during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., SN65HVD230) against EFT bursts and lightning-induced surges on factory floor cabling. IC Role / Device Role / Timing Role: Line-to-ground TVS on both A and B differential pairs, leveraging symmetric clamping to preserve common-mode noise rejection. Use Value: Maintains data integrity by limiting differential voltage excursion to <42.1 V, well below transceiver absolute maximum ratings. |
| Consumer USB Port Protection | Smart Meter Power Supply Input |
Use Scenario: Adding secondary surge immunity to USB 2.0 D+/D− lines after primary common-mode choke filtering. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS shunting each data line to ground, placed adjacent to connector. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within nanoseconds while adding <0.5 pF parasitic capacitance. |
Use Scenario: Front-end protection on 230 V AC–DC converter input against induced surges from nearby switching loads. IC Role / Device Role / Timing Role: Secondary TVS stage after MOV, absorbing residual fast-rising spikes (<100 ns) that bypass bulk clamping. Use Value: Extends system MTBF by preventing cumulative degradation of bridge rectifier and bulk capacitor from repetitive sub-100 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Direct material substitution when halogen-free certification is required; same layout and thermal performance. |
| SMBJ26CA-E3/52 | Higher 600 W PPPM, larger SMB (DO-214AA) package (5.28 mm × 4.57 mm), same VWM/VC specs. | Used where higher surge margin is needed (e.g., outdoor telecom equipment), but requires PCB pad revision. | Choose when 400 W is insufficient and board space allows larger footprint; not drop-in replaceable. |
Compared with SMAJ26CA-E3/5A, the M3/5A offers identical protection with halogen-free assurance, while SMBJ26CA-E3/52 trades compactness for +50 % surge capacity-requiring layout change but enabling harsher environment deployment.
Availability
SMAJ26CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication interfaces, consumer port hardening, and smart meter front-end surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ26CA-E3/5A 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 automotive-grade validation.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and consumer electronics-designed for rapid response, repeatable clamping, and seamless SMT integration.
FAQ
What is the clamping voltage of SMAJ26CA-E3/5A at its rated peak pulse current?
The SMAJ26CA-E3/5A clamps to a maximum of 42.1 V when subjected to its rated peak pulse current of 9.5 A under the standard 10/1000 μs waveform. This value is guaranteed across temperature and production lot, ensuring predictable protection margin for downstream 3.3 V or 5 V ICs. The clamping voltage is measured at the device terminals with specified test conditions per JEDEC standards.
Is SMAJ26CA-E3/5A suitable for automotive applications?
SMAJ26CA-E3/5A itself is commercial-grade, but it shares identical die and construction with AEC-Q101-qualified variants (e.g., SMAJ26CAHE3_A/I). For production automotive use, specify the HE3 or HM3 suffix; however, SMAJ26CA-E3/5A is routinely used in automotive prototyping, infotainment accessories, and non-safety-critical subsystems where full qualification is not mandated.
How does the bidirectional nature of SMAJ26CA-E3/5A affect its PCB layout?
Because SMAJ26CA-E3/5A is bidirectional and unmarked, PCB layout requires no polarity alignment-either terminal may connect to the protected line, the other to ground. This simplifies routing on differential pairs (e.g., CAN, RS-485) and eliminates orientation errors during automated placement. No cathode band marking is present, unlike unidirectional versions.
What is the maximum operating temperature for SMAJ26CA-E3/5A?
The SMAJ26CA-E3/5A has a maximum junction temperature (TJ) of +150 °C and an operating ambient range of –55 °C to +150 °C. Derating begins above 25 °C ambient per Figure 2 in the datasheet; at 85 °C ambient, its peak pulse power drops to ~280 W. Thermal design must account for RθJA = 120 °C/W using the recommended 0.2″ × 0.2″ copper pads per terminal.
Does SMAJ26CA-E3/5A meet any industry surge immunity standards out of the box?
SMAJ26CA-E3/5A is engineered to support compliance with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) when applied with appropriate layout-such as short traces, dedicated ground plane, and proper decoupling. Its 400 W rating aligns with Level 3 (2 kV line-to-ground) and Level 4 (4 kV line-to-ground) requirements under 2 Ω source impedance, but system-level validation remains the designer's responsibility.
SMAJ26CA-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ26CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CA-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ26CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ26CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CA-E3/5A?
SMAJ26CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CA-E3/5A 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-E3/5A?
For technical support, including SMAJ26CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ26CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ26CA-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ26CA-E3/5A?
All SMAJ26CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CA-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ26CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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