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Vishay General Semiconductor - Diodes Division SMAJ26AHE3/61
- Part No.:
- SMAJ26AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHE3/61.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,176
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Product details
Overview
SMAJ26AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and 24 V supply rail protection.
For engineers reviewing the SMAJ26AHE3/61 datasheet, SMAJ26AHE3/61 pinout, SMAJ26AHE3/61 application, or SMAJ26AHE3/61 equivalent, key selection criteria include clamping performance under 9.5 A surge, AEC-Q101 qualification status, unidirectional polarity marking, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below 26 V and rapidly transitions to low-impedance conduction above its 28.9 V minimum breakdown threshold. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and fast response time (<1 ns), enabling suppression of ESD, load dump, and inductive switching transients before downstream ICs are damaged.
The SMAJ26AHE3/61 is rated for 40 A non-repetitive forward surge current (IFSM), supports continuous power dissipation of 3.3 W at 50 °C ambient, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its AEC-Q101 qualification confirms suitability for automotive under-hood and body-control module applications requiring extended temperature operation (−55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 42.1 V at 9.5 A - Clamping voltage limits stress on protected ICs during worst-case 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform, derated above 25 °C per Fig. 2. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms), supporting protection against automotive load-dump events. |
| TJ max. | +150 °C - Maximum junction temperature enabling reliable operation in under-hood environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on cathode end; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during reverse-biased clamping | Connected to protected line (e.g., 24 V rail); conducts surge current toward ground when VIN exceeds VBR. |
| Cathode | Current exit terminal during clamping; marked with band | Connected to system ground or low-impedance return path; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| Glass passivated junction | Ensures stable leakage current (<1 μA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
| 400 W peak pulse power (10/1000 μs) | Provides robust immunity against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events in 24 V systems. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V/5 V logic interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and chassis ground to clamp surges up to 400 W. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤42.1 V, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to cable ESD and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-signal line and cathode-to-ground to suppress negative-going transients. Use Value: Maintains signal integrity by clamping transients within 1 ns while adding <1 pF capacitance - no impact on loop bandwidth. |
| Consumer Power Adapter Input Protection | Telecom DC Feeder Line Protection |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters supplying 24 V to smart home hubs and PoE injectors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across output capacitor to absorb flyback spikes and rectifier reverse recovery energy. Use Value: Prevents output overvoltage faults during no-load or short-circuit conditions without affecting regulation stability. |
Use Scenario: DC feed line protection in remote radio heads (RRH) where −48 V telecom supplies interface with outdoor antennas. IC Role / Device Role / Timing Role: Unidirectional TVS installed on −48 V input to clamp positive transients induced by lightning-induced coupling. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W while maintaining <1 μA leakage at −48 V nominal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/61 | Commercial-grade version; identical electrical specs but not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial 24 V systems without automotive lifecycle requirements. | Select when AEC-Q101 is not mandated and cost optimization is prioritized. |
| SMBJ26AHE3/61 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 2.5 mm wider, higher PPPM (600 W), RθJA = 80 °C/W. | Higher power handling and better thermal performance; requires larger PCB footprint. | Choose when surge energy exceeds 400 W or board layout allows larger package for improved thermal margin. |
Compared with SMAJ26AHE3/61, the SMAJ26A-E3/61 offers identical clamping and surge ratings but lacks automotive qualification, while the SMBJ26AHE3/61 delivers 50 % higher peak pulse power in a physically larger package - enabling longer surge duration tolerance or lower thermal rise in high-power industrial designs.
Availability
SMAJ26AHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, and 24 V power adapter designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ26AHE3/61 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, power efficiency, and automotive-grade validation.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, load dump, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMAJ26AHE3/61 at its rated peak pulse current?
The SMAJ26AHE3/61 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 SMAJ26AHE3/61 maintains this clamping performance across its qualified operating temperature range (−55 °C to +150 °C), making it suitable for under-hood automotive use.
Is SMAJ26AHE3/61 AEC-Q101 qualified, and what does that cover?
Yes, SMAJ26AHE3/61 is AEC-Q101 qualified - confirmed by Vishay's documentation and ordering code suffix "HE3". This qualification covers stress testing for high-temperature operating life, temperature cycling, mechanical shock, humidity bias, and ESD (HBM ≥ 8 kV). The SMAJ26AHE3/61 is validated for use in automotive powertrain, chassis, and body electronics where reliability under thermal and vibration stress is mandatory.
How does the SMAJ26AHE3/61 differ from bidirectional variants like SMAJ26CA?
The SMAJ26AHE3/61 is unidirectional and features a cathode band for polarity-sensitive placement, whereas SMAJ26CA is bidirectional with no polarity marking and symmetric clamping in both directions. The SMAJ26AHE3/61 exhibits forward voltage drop (~3.5 V at 25 A) and is intended for DC rail protection, while SMAJ26CA suits AC signal lines or floating buses. Their VBR and VC values differ slightly due to structural asymmetry in unidirectional construction.
What is the thermal resistance and power derating behavior of SMAJ26AHE3/61?
The SMAJ26AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. Its 3.3 W steady-state power dissipation (PD) is rated at TA = 50 °C and must be linearly derated above that temperature - dropping to zero at 150 °C junction temperature. Derating follows the curve in Figure 2 of Vishay document 88390, ensuring safe operation under sustained power dissipation in enclosed industrial enclosures.
Can SMAJ26AHE3/61 be used in place of SMAJ24AHE3/61 or SMAJ28AHE3/61?
SMAJ26AHE3/61 is not a direct replacement for SMAJ24AHE3/61 or SMAJ28AHE3/61 due to differences in standoff voltage (VWM = 26 V vs. 24 V or 28 V) and corresponding breakdown ranges. Substituting alters the protection threshold - using SMAJ26AHE3/61 in a 24 V system risks premature conduction, while in a 28 V system it may fail to clamp early enough. Each SMAJ variant is optimized for specific rail voltages; the SMAJ26AHE3/61 is strictly intended for 26 V nominal or 24 V systems with sufficient margin.
SMAJ26AHE3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ26AHE3/61 FAQ
1.How can I place an order for SMAJ26AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHE3/61 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 SMAJ26AHE3/61 reliable?
The price and inventory of SMAJ26AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ26AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHE3/61?
SMAJ26AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHE3/61 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 SMAJ26AHE3/61?
For technical support, including SMAJ26AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHE3/61 requirements.
6.How does Aetrix verify that SMAJ26AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHE3/61 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 SMAJ26AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ26AHE3/61?
All SMAJ26AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHE3/61, 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 SMAJ26AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ26AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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