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Vishay General Semiconductor - Diodes Division SMAJ26AHM3/I
- Part No.:
- SMAJ26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
SMAJ26AHM3/I from Vishay General Semiconductor is a unidirectional 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 range at 1 mA, 42.1 V maximum clamping voltage at 9.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and I/O lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ26AHM3/I datasheet, SMAJ26AHM3/I pinout, SMAJ26AHM3/I application, or SMAJ26AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, low incremental surge resistance, and verified clamping performance under repetitive transients in automotive-grade designs.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt protector: when reverse voltage exceeds VWM = 26 V, it avalanches to clamp transient energy within nanoseconds. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while thermal resistance RθJA = 120 °C/W supports operation up to TJ = 150 °C.
The device delivers 400 W peak pulse power (derated to 300 W above 78 V), with IPPM = 9.5 A at VC = 42.1 V under standardized 10/1000 μs surge. Polarity is marked by cathode band; terminals are matte tin-plated and compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (Breakdown Voltage) | 28.9–31.9 V at IT = 1 mA - Confirmed avalanche onset range for reliable triggering |
| VC (Clamping Voltage) | 42.1 V at IPPM = 9.5 A - Peak voltage seen by protected circuit during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy absorption capability per single pulse |
| IFSM (Surge Current) | 40 A - 8.3 ms half-sine forward surge rating for unidirectional stress events |
| TJmax | 150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.93 mm footprint and MSL Level 1 rating |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail or signal input); band marks this end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for Tier 1 automotive supply chains and industrial OEMs |
| 400 W peak pulse power (10/1000 μs) | Protects against ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surges without degradation |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during transients, preserving margin for downstream ICs rated ≤ 45 V |
| MSL Level 1 (260 °C peak reflow) | Enables standard SMT assembly without moisture sensitivity handling or baking |
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 inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and chassis ground to clamp transients above 26 V. Use Value: Limits voltage to ≤42.1 V during 9.5 A surges, preventing damage to 36 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in pressure/temperature transmitters exposed to ESD and cable discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point to divert fast transients before signal conditioning circuitry. Use Value: Sub-100 ps response time and <1.0 μA leakage at 26 V preserve signal integrity and offset accuracy in precision measurement systems. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding Ethernet PHY power pins and auxiliary bias rails in outdoor telecom base station line cards from lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage protection scheme, coordinated with GDTs and series impedance. Use Value: 400 W rating and 120 °C/W thermal resistance support repeated surge events without thermal runaway in sealed enclosures. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive kickback during MOSFET switching transitions. Use Value: 40 A IFSM rating handles high-current turn-off events; glass-passivated junction ensures long-term reliability under cyclic stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26AHE3/I | Same electrical specs but RoHS-compliant E3 suffix (not halogen-free); no AEC-Q101 qualification | Approved for commercial/industrial use only; not certified for automotive production | Select when halogen-free content or automotive qualification is not required |
| SMBJ26A-HM3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, identical VWM/VC ratings | Used where higher surge margin is needed and PCB space allows larger footprint | Choose for enhanced ruggedness in high-energy industrial environments |
Compared with SMAJ26AHM3/I, SMAJ26AHE3/I lacks halogen-free and automotive qualifications, while SMBJ26A-HM3 offers greater surge capacity in a physically larger package - making SMAJ26AHM3/I optimal for space-constrained AEC-Q101-compliant designs requiring balanced performance and compliance.
Availability
SMAJ26AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ26AHM3/I 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, and protection devices with emphasis on reliability and automotive-grade validation.
The SMAJ series targets high-reliability transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom applications demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ26AHM3/I at its rated peak pulse current?
The SMAJ26AHM3/I has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 9.5 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring compatibility with downstream components rated for ≤45 V operation. The SMAJ26AHM3/I maintains this clamping performance across its qualified temperature range.
Is SMAJ26AHM3/I qualified for automotive applications?
Yes, SMAJ26AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - validating its suitability for under-hood and cabin-mounted automotive electronics including body control modules and sensor nodes. The SMAJ26AHM3/I meets all applicable AEC-Q101 test requirements for transient voltage suppressors.
What does the "HM3" suffix indicate for SMAJ26AHM3/I?
The "HM3" suffix in SMAJ26AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, but not halogen-free) variants. This suffix confirms compliance with automotive supply chain material restrictions and enables use in Tier 1 OEM programs requiring full environmental and reliability certification. The SMAJ26AHM3/I is supplied in 13" tape-and-reel (I-pack) format per ordering information.
How does SMAJ26AHM3/I compare to bidirectional TVS diodes like SMAJ26CA?
SMAJ26AHM3/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., 24 V supply rails), offering lower leakage (<1.0 μA at VWM) and tighter VBR tolerance than bidirectional counterparts. In contrast, SMAJ26CA provides symmetrical clamping for AC or floating lines but exhibits higher reverse leakage and wider VBR spread. The SMAJ26AHM3/I is not interchangeable with SMAJ26CA without circuit redesign due to polarity dependency and differing leakage behavior.
What is the thermal resistance and maximum junction temperature of SMAJ26AHM3/I?
The SMAJ26AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a maximum junction temperature (TJmax) of +150 °C. These values are specified under standard mounting conditions (0.2" × 0.2" copper pads per terminal) and define its safe operating envelope in thermally constrained layouts. Derating curves in the datasheet show power capability reduction above 25 °C ambient, ensuring reliable operation in automotive under-hood environments where SMAJ26AHM3/I is commonly deployed.
SMAJ26AHM3/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ26AHM3/I FAQ
1.How can I place an order for SMAJ26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHM3/I 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 SMAJ26AHM3/I reliable?
The price and inventory of SMAJ26AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHM3/I?
SMAJ26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHM3/I 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 SMAJ26AHM3/I?
For technical support, including SMAJ26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHM3/I requirements.
6.How does Aetrix verify that SMAJ26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHM3/I 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 SMAJ26AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ26AHM3/I?
All SMAJ26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHM3/I, 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 SMAJ26AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26AHM3/I Tags
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