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Vishay General Semiconductor - Diodes Division SMAJ26CAHE3_A/H
- Part No.:
- SMAJ26CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHE3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
SMAJ26CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ26CAHE3_A/H datasheet, SMAJ26CAHE3_A/H pinout, SMAJ26CAHE3_A/H application, or SMAJ26CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protection element across sensitive nodes, responding within <1 ps to ESD and surge events per IEC 61000-4-2/4-4/4-5. Its bidirectional symmetry enables use on AC-coupled or floating signal lines without polarity concerns, and its glass-passivated junction ensures stable leakage (<1 μA at 26 V) and repeatable breakdown behavior over temperature (−55 °C to +150 °C).
The SMAJ26CAHE3_A/H delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). Its unidirectional counterpart SMAJ26A shares identical VBR, VC, and IPPM ratings but differs in polarity marking and forward conduction capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM | 42.1 V at 9.5 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream 3.3 V/5 V logic or gate drivers. |
| PPPM | 400 W - Peak pulse power handling with standard 10/1000 μs waveform; supports repetitive surges at 0.01% duty cycle. |
| IFSM | 40 A - Non-repetitive 8.3 ms half-sine surge current rating (unidirectional only); not applicable to SMAJ26CAHE3_A/H due to bidirectional structure. |
| TJmax | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or high-ambient industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT; suffix HE3 denotes qualification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage relative to cathode side. |
| Cathode | Transient current exit (reverse bias) | Second terminal of symmetrical junction; completes clamping path regardless of voltage polarity applied across device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled, differential, or floating signal lines (e.g., CAN, RS-485, sensor bridges) without external polarity management. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade reliability including temperature cycling, high-temperature reverse bias, and humidity testing - suitable for ADAS and body control modules. |
| 400 W peak pulse power (≤78 V) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 3.3 V microcontrollers or 5 V analog front-ends. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free reflow profiles without baking or special handling; supports high-volume automated assembly. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector interface to shunt transients before reaching ADC input or op-amp buffer. Use Value: Limits induced voltage to ≤42.1 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in downstream signal conditioning ICs. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers connected to 24 V DC field wiring subject to inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional transient suppressor installed across input terminals to clamp both positive and negative polarity spikes from relay coils or solenoids. Use Value: Maintains functional integrity under repeated 1 kV/500 A surge events per IEC 61000-4-4, extending system uptime in factory automation environments. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding RS-485 transceiver pins in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary clamping device located at PCB edge connector, coordinated with GDT or MOV for staged protection. Use Value: Responds in sub-nanosecond time to limit transient voltage to safe levels before secondary protection activates, reducing overall let-through energy. |
Use Scenario: Adding robust ESD immunity to USB-C or barrel jack inputs of wall adapters rated for 24 V output. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary fuse and common-mode choke to absorb contact discharge per IEC 61000-4-2 ±8 kV. Use Value: Prevents catastrophic failure of rectifier diodes or controller ICs during user-handling events, supporting CE/UL certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive stress validation; suitable for industrial/commercial designs where qualification is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and lifecycle assurance is managed externally. |
| SMBJ26CAHE3_A/H | Same VWM, VBR, VC; higher 600 W PPPM rating and SMB (DO-214AA) package with larger thermal pad area. | Offers enhanced surge margin and lower RθJA (90 °C/W); requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 400 W requirements or ambient temperatures exceed 105 °C. |
Compared with SMAJ26CAHE3_A/H, SMAJ26CA-E3/61 reduces qualification overhead but sacrifices automotive reliability evidence, while SMBJ26CAHE3_A/H increases surge headroom at the cost of board space and thermal design complexity - making SMAJ26CAHE3_A/H the optimal balance for AEC-Q101-compliant 24 V systems with constrained layout.
Availability
SMAJ26CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and consumer power adapter ESD protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ26CAHE3_A/H 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 targets board-level transient protection in space-constrained, high-reliability applications - engineered for fast response, precise clamping, and seamless integration into automotive, industrial, and communications infrastructure designs.
FAQ
What is the clamping voltage of SMAJ26CAHE3_A/H at its rated peak pulse current?
The SMAJ26CAHE3_A/H has a maximum clamping voltage (VC) of 42.1 V at 9.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ26CAHE3_A/H maintains this clamping performance across its qualified operating temperature range of −55 °C to +150 °C.
Is SMAJ26CAHE3_A/H suitable for automotive applications?
Yes, SMAJ26CAHE3_A/H is AEC-Q101 qualified, as indicated by the "HE3" suffix, and validated for automotive use including temperature cycling, high-temperature reverse bias, and humidity testing. It is commonly deployed in engine control units, body electronics, and ADAS sensor modules where robust transient suppression is required. The SMAJ26CAHE3_A/H meets the reliability and traceability demands of Tier 1 automotive supply chains.
How does the bidirectional configuration of SMAJ26CAHE3_A/H affect its circuit implementation?
The bidirectional configuration of SMAJ26CAHE3_A/H eliminates polarity dependency, allowing direct placement across any two-node interface - such as differential bus lines (CAN, RS-485) or AC-coupled analog paths - without orientation constraints. Unlike unidirectional variants, SMAJ26CAHE3_A/H has no cathode band marking and conducts symmetrically in both directions, simplifying layout and reducing BOM count in balanced signal architectures.
What is the thermal resistance of SMAJ26CAHE3_A/H, and how does it impact PCB layout?
SMAJ26CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To achieve rated 400 W pulse power, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature, derating pulse capability - so SMAJ26CAHE3_A/H layout must follow Vishay's recommended pad dimensions for full specification compliance.
Does SMAJ26CAHE3_A/H have moisture sensitivity level (MSL) rating, and what does it mean for assembly?
Yes, SMAJ26CAHE3_A/H meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means the device can be processed using standard lead-free reflow profiles without pre-baking or dry-packaging, supporting high-yield, high-throughput SMT assembly. The MSL Level 1 rating applies to the HE3 variant and confirms robustness against popcorning or delamination during manufacturing - a key advantage of SMAJ26CAHE3_A/H in volume production.
SMAJ26CAHE3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ26CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHE3_A/H 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_A/H reliable?
The price and inventory of SMAJ26CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHE3_A/H?
SMAJ26CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHE3_A/H 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_A/H?
For technical support, including SMAJ26CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ26CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHE3_A/H?
All SMAJ26CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMAJ26CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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