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Vishay General Semiconductor - Diodes Division SMAJ26CAHE3/61
- Part No.:
- SMAJ26CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHE3/61.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ26CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features a 26 V stand-off 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 with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ26CAHE3/61 datasheet, SMAJ26CAHE3/61 pinout, SMAJ26CAHE3/61 application, or SMAJ26CAHE3/61 equivalent, this AEC-Q101 qualified, RoHS-compliant bidirectional TVS delivers verified clamping performance, low leakage (<1.0 μA at 26 V), and MSL Level 1 moisture sensitivity - critical for high-reliability board-level surge hardening in harsh environments.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) with <1.0 μA reverse leakage at VWM = 26 V; during transients exceeding VBR (min 28.9 V), it avalanches rapidly (<1 ns response) to clamp voltage to ≤42.1 V at 9.5 A. Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating lines.
Thermally, it sustains 150 °C junction temperature with RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and handles 40 A non-repetitive forward surge (8.3 ms half-sine). The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on above system operating voltage. |
| VC @ IPPM | 42.1 V at 9.5 A - Measured clamping voltage under 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| IPPM | 9.5 A - Peak surge current corresponding to VC; determines minimum series impedance required for coordination. |
| Leakage ID | <1.0 μA at 26 V - Ultra-low standby current; avoids loading of high-impedance sensor or reference circuits. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. No polarity marking - bidirectional construction eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Either terminal serves as input/output; no DC polarity dependency - ideal for AC lines, differential pairs, or floating buses. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when properly coordinated. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; reduces manufacturing complexity and cost. |
| Low clamping ratio (VC/VBR ≈ 1.47) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V systems. |
| Glass-passivated junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives - improves field lifetime in humid environments. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping induced spikes before they reach signal conditioning circuitry. Use Value: Maintains signal integrity under 12 V/24 V system transients while adding zero propagation delay or signal distortion to normal operation. |
Use Scenario: Safeguarding PLC digital input modules against inductive kickback from solenoids, relays, and motor contactors in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamping element across 24 V DC input lines, absorbing repetitive switching surges without degradation. Use Value: Eliminates need for external RC snubbers or varistors - reduces BOM count and PCB area while meeting IEC 61000-4-4 EFT immunity. |
| Telecom Line Interface | Consumer USB/Display Port ESD Hardening |
Use Scenario: Shielding RS-485/RS-422 transceivers in base station backhaul links from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary line-side TVS in multi-stage protection architecture, diverting >90% of surge energy to ground before secondary TVS or GDT. Use Value: Withstands repeated 10/1000 μs surges up to 400 W without parameter shift - extends maintenance intervals in remote deployments. |
Use Scenario: Adding IEC 61000-4-2 Level 4 (±15 kV contact) ESD protection to USB 2.0 data lines and HDMI/DisplayPort hot-plug detection pins. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) shunt suppressor placed adjacent to connector, minimizing signal integrity impact. Use Value: Clamps ESD events within <1 ns while maintaining <0.5 pF parasitic capacitance - preserves signal rise time and eye diagram integrity. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM or regional regulations. | Choose SMAJ26CA-M3/61 when halogen-free material declaration is contractually required. |
| SMCJ26CAHE3/61 | Same VWM/VBR/VC, but SMC (DO-214AB) package - 1.5× higher PPPM (1500 W) and lower RθJA (60 °C/W). | Used where higher surge energy absorption or improved thermal dissipation is needed, e.g., main power rail protection. | Choose SMCJ26CAHE3/61 when system-level surge tests exceed 400 W or board layout allows larger footprint. |
Compared with SMAJ26CAHE3/61, SMAJ26CA-M3/61 offers identical protection performance with halogen-free materials, while SMCJ26CAHE3/61 provides 3.75× higher surge power handling in a larger package - enabling scalable protection architecture from signal-line to bulk-power domains.
Availability
SMAJ26CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and telecom line interface applications requiring stable component supply, AEC-Q101 traceability, and RoHS compliance.
Supply support for SMAJ26CAHE3/61 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 application-specific optimization.
The SMAJ series is engineered for board-level transient suppression in automotive, industrial, and telecom systems - delivering standardized, AEC-Q101 qualified TVS performance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ26CAHE3/61 at its rated peak pulse current?
The SMAJ26CAHE3/61 has a maximum clamping voltage (VC) of 42.1 V at its peak pulse current (IPPM) of 9.5 A, measured with a 10/1000 μs waveform. This value is guaranteed across temperature and ensures protected downstream circuitry remains within safe overvoltage limits during surge events. The SMAJ26CAHE3/61 achieves this with a low clamping ratio of approximately 1.47 relative to its minimum breakdown voltage.
Is SMAJ26CAHE3/61 suitable for automotive applications?
Yes, SMAJ26CAHE3/61 is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance across -55 °C to +150 °C operating range - all confirmed per AEC-Q101 test requirements. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified version of SMAJ26CAHE3/61.
How does the bidirectional design of SMAJ26CAHE3/61 affect its circuit implementation?
The bidirectional design of SMAJ26CAHE3/61 means it functions identically in both polarities - no cathode marking is present, and it clamps symmetrically above ±28.9 V. This eliminates polarity-checking during placement and simplifies protection of AC-coupled signals, differential buses (e.g., RS-485), or floating grounds. Unlike unidirectional TVS diodes, SMAJ26CAHE3/61 requires no series blocking diode and maintains consistent VC regardless of transient polarity.
What is the maximum steady-state power dissipation of SMAJ26CAHE3/61?
The SMAJ26CAHE3/61 has a maximum steady-state power dissipation (PD) of 3.3 W at 50 °C ambient temperature on an infinite heatsink. In typical PCB layouts with 0.2" × 0.2" copper pads per terminal, derating applies per Figure 2 in the datasheet - at 100 °C ambient, usable PD drops to ~2.0 W. This rating governs continuous leakage power under elevated VWM bias, not transient surge capability.
Does SMAJ26CAHE3/61 require additional series impedance for effective surge coordination?
Yes, SMAJ26CAHE3/61 must be used with appropriate series impedance (e.g., ferrite bead or resistor) to coordinate with downstream ICs and ensure surge current is diverted through the TVS rather than into sensitive inputs. For example, pairing SMAJ26CAHE3/61 with a 10 Ω resistor limits peak current into a 3.3 V MCU GPIO to <100 mA during a 42.1 V clamp event. Coordination is essential to realize the full protective benefit of SMAJ26CAHE3/61 in real-world layouts.
SMAJ26CAHE3/61 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)
SMAJ26CAHE3/61 FAQ
1.How can I place an order for SMAJ26CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHE3/61 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 SMAJ26CAHE3/61 reliable?
The price and inventory of SMAJ26CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHE3/61?
SMAJ26CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHE3/61 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 SMAJ26CAHE3/61?
For technical support, including SMAJ26CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ26CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHE3/61 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 SMAJ26CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHE3/61?
All SMAJ26CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHE3/61, 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 SMAJ26CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ26CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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