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Vishay General Semiconductor - Diodes Division SMAJ26CAHE3/5A
- Part No.:
- SMAJ26CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHE3/5A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,059
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Product details
Overview
SMAJ26CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMAJ26CAHE3/5A datasheet, SMAJ26CAHE3/5A pinout, SMAJ26CAHE3/5A application, or SMAJ26CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.43), AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, delivering identical clamping behavior across positive and negative transients. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. With a maximum junction temperature of +150 °C and MSL Level 1 moisture sensitivity, it supports reflow soldering at 260 °C peak and sustains repetitive surge events at 0.01% duty cycle when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche breakdown; ensures predictable turn-on. |
| VC (Clamping Voltage) | 42.1 V at 9.5 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; determines safe voltage headroom for downstream components. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Transient energy-handling capacity under standardized surge waveform; defines protection level against IEC 61000-4-5 threats. |
| IPPM (Peak Pulse Current) | 9.5 A - Maximum non-repetitive surge current the device can safely shunt without degradation; directly tied to PCB trace and layout design. |
| TJmax | +150 °C - Maximum allowable junction temperature; constrains thermal design and power dissipation in high-ambient environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under DC leakage or repetitive surge conditions. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Complies with UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path (bidirectional) | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking required for CA variants. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - enables use in engine control, ADAS, and infotainment power rails. |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against ISO 7637-2 pulse 1/2a/2b and IEC 61000-4-5 level 3/4 surges without derating below 78 V. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic interfaces and low-voltage MOSFET gate drivers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without preconditioning - eliminates handling complexity in high-volume SMT assembly. |
| Glass passivated junction | Ensures stable leakage (<1.0 μA at VWM) and long-term parameter consistency across temperature and lifetime. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and ground, absorbing >100 V spikes within nanoseconds. Use Value: Limits rail voltage to ≤42.1 V during 9.5 A surge, preventing latch-up or permanent damage to microcontrollers and CAN transceivers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and field wiring surges in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or signal-to-ground, suppressing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity with <1.0 μA leakage at 26 V, while clamping transients before they reach precision ADC inputs or op-amp buffers. |
| Consumer Device USB Port Protection | Telecom Power Supply Input Protection |
|
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against hot-plug transients and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed on VBUS line upstream of USB controller, activated within <1 ns of overvoltage event. Use Value: Clamps VBUS to 42.1 V during 10/1000 μs surge, preserving USB enumeration and preventing port controller reset or damage. |
Use Scenario: Front-end protection of AC/DC or DC/DC converter inputs in telecom base station power modules. IC Role / Device Role / Timing Role: Primary surge suppression stage before input filter and rectifier, handling repetitive line-switching transients. Use Value: Sustains 400 W pulses at 0.01% duty cycle without parameter shift, ensuring long-term reliability in 24/7 powered infrastructure equipment. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package and pinout. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional environmental regulations. | Direct drop-in replacement for SMAJ26CAHE3/5A when halogen-free content is required; no layout or validation changes needed. |
| SMBJ26CAHE3/5A | Same VWM, VBR, and VC, but in larger SMB (DO-214AA) package; higher thermal mass (RθJA = 80 °C/W vs. 120 °C/W); 600 W PPPM rating. | Better suited for higher-energy surge environments or designs requiring extended thermal margin; occupies more PCB area. | Preferred when system-level surge testing exceeds 400 W or ambient temperatures exceed 85 °C; requires footprint redesign. |
Compared with SMAJ26CAHE3/5A, the SMAJ26CA-M3/5A offers identical protection performance with halogen-free construction, while the SMBJ26CAHE3/5A delivers higher surge energy handling at the cost of increased board space and different thermal behavior - selection depends on environmental compliance needs and system-level surge test requirements.
Availability
SMAJ26CAHE3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom power supply input conditioning requiring stable component supply, AEC-Q101 assurance, and consistent surge performance across production batches.
Supply support for SMAJ26CAHE3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained, high-surge environments - particularly targeting automotive, industrial, and telecom systems where AEC-Q101 qualification and repeatable clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SMAJ26CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration: SMAJ26CAHE3/5A provides symmetrical clamping for both positive and negative voltage transients, unlike unidirectional "A" variants. This makes SMAJ26CAHE3/5A ideal for AC-coupled lines, differential buses, or any application where polarity of surge events cannot be guaranteed - such as automotive LIN bus or industrial analog sensor outputs.
Is SMAJ26CAHE3/5A suitable for protecting 3.3 V logic circuits?
No - SMAJ26CAHE3/5A is not appropriate for direct 3.3 V logic protection due to its 26 V stand-off voltage and 42.1 V clamping voltage. Using SMAJ26CAHE3/5A on a 3.3 V rail would allow destructive overvoltage before clamping activates. For 3.3 V systems, lower-voltage TVS devices such as SMAJ5.0CAHE3/5A (VWM = 5.0 V, VC = 9.2 V) are required to ensure timely clamping within safe operating limits of the protected IC.
Does SMAJ26CAHE3/5A require a heatsink for typical operation?
No external heatsink is required for SMAJ26CAHE3/5A under normal transient conditions, as it handles energy in short-duration pulses (e.g., 10/1000 μs) rather than continuous power dissipation. Its 3.3 W steady-state power rating (PD) and 120 °C/W junction-to-ambient thermal resistance are sufficient for leakage-current heating in most PCB layouts with standard copper pads. Heatsinking is unnecessary unless subjected to frequent repetitive surges near its 400 W limit.
How does the HE3 suffix affect the specification of SMAJ26CAHE3/5A?
HE3 indicates RoHS-compliant construction with AEC-Q101 qualification - confirming that SMAJ26CAHE3/5A meets automotive-grade reliability standards (including temperature cycling, high-temperature reverse bias, and surge endurance) and contains no restricted substances per EU RoHS Directive. This suffix distinguishes it from commercial-grade E3 variants and ensures suitability for under-hood and safety-critical automotive applications.
Can SMAJ26CAHE3/5A be used in place of SMAJ26AHE3/5A?
No - SMAJ26CAHE3/5A and SMAJ26AHE3/5A are not interchangeable without circuit review. SMAJ26AHE3/5A is unidirectional (cathode-marked, conducts only in reverse bias), while SMAJ26CAHE3/5A is bidirectional (no polarity marking, clamps both polarities). Substituting one for the other may result in failure to suppress positive transients (if using the unidirectional part in a bidirectional location) or unintended forward conduction (if using the bidirectional part in a DC-biased unidirectional path).
SMAJ26CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ26CAHE3/5A FAQ
1.How can I place an order for SMAJ26CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHE3/5A 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 SMAJ26CAHE3/5A reliable?
The price and inventory of SMAJ26CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHE3/5A?
SMAJ26CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHE3/5A 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 SMAJ26CAHE3/5A?
For technical support, including SMAJ26CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ26CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHE3/5A 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 SMAJ26CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHE3/5A?
All SMAJ26CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHE3/5A, 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 SMAJ26CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ26CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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