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Vishay General Semiconductor - Diodes Division SMAJ26AHE3/5A
- Part No.:
- SMAJ26AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHE3/5A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
SMAJ26AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal 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 (IPPM), 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 SMAJ26AHE3/5A datasheet, SMAJ26AHE3/5A pinout, SMAJ26AHE3/5A application, or SMAJ26AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on PCBs requiring robust ESD and lightning surge immunity.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, limiting transient energy to protected downstream circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
The SMAJ26AHE3/5A is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits a temperature coefficient of VBR at +0.097 %/°C. It meets MSL Level 1 per J-STD-020 and is RoHS-compliant with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - Voltage at which avalanche conduction begins; ensures reliable triggering during overvoltage events. |
| VC (Clamping Voltage) | 42.1 V at 9.5 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity under standard surge waveform; supports IEC 61000-4-5 level 4 compliance when properly laid out. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and high-temperature industrial environments. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward current until breakdown, suitable for DC-biased lines like 24 V supply rails. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band on body; anode is unmarked end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for full 400 W rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensors requiring long-term reliability under thermal and mechanical stress. |
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe transients such as ISO 7637-2 pulse 5a (load dump) in 24 V systems without derating above 78 V. |
| Glass passivated junction | Ensures stable reverse leakage (<1 μA at VWM) and consistent VBR across temperature and lifetime, critical for precision sensing nodes. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirements and simplifies SMT manufacturing flow. |
| Low profile SMA package | 0.208" × 0.157" footprint with 0.090" height - fits dense layouts in ECUs, motor drives, and IoT edge nodes where board space is constrained. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control modules from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and input filter capacitor. Use Value: Limits transient voltage to ≤42.1 V during 9.5 A surge, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure or temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA or 0–10 V signal lines exposed to relay switching noise. Use Value: Sub-1 ns response clamps fast-rising EFT bursts (IEC 61000-4-4) before they corrupt ADC readings or trigger false alarms. |
| Telecom Power Supply Input | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding primary-side DC input of PoE-powered switches against lightning-induced surges on outdoor Ethernet lines. IC Role / Device Role / Timing Role: First-stage TVS on 48 V input bus upstream of active rectification and isolation. Use Value: Absorbs up to 400 W of surge energy without degradation, maintaining system uptime during Category C2/C3 lightning events. |
Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFETs driven by microcontroller GPIOs in motor inverters. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SMAJ26AHE3/5A used on isolated low-side driver supply rail. Use Value: Clamps negative-going transients from inductive kickback to <42.1 V, keeping gate-source voltage within ±20 V absolute max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/5A | No AEC-Q101 qualification; commercial grade only; identical electrical specs and package. | Suitable for non-automotive industrial or consumer applications where automotive reliability validation is not required. | Select when cost sensitivity outweighs need for automotive qualification and long-term field reliability data. |
| SMAJ26AHM3/5A | Halogen-free, RoHS-compliant, AEC-Q101 qualified; same VWM/VBR/VC/PPPM but different plating chemistry. | Required for automotive Tier 1 suppliers mandating halogen-free materials in final assemblies. | Choose when compliance with VW 80101 or GMW3172 material restrictions applies to the BOM. |
Compared with SMAJ26AHE3/5A, the SMAJ26A-E3/5A lacks automotive qualification but offers lower unit cost, while the SMAJ26AHM3/5A adds halogen-free construction at equivalent performance - enabling compliance-driven or cost-optimized sourcing paths without redesign.
Availability
SMAJ26AHE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom power supply hardening requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ26AHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of the SMAJ26AHE3/5A at its rated peak pulse current?
The SMAJ26AHE3/5A has a maximum clamping voltage (VC) of 42.1 V at 9.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ26AHE3/5A maintains this clamping performance across its full operating temperature range and after repeated surges when mounted per recommended pad layout.
Is the SMAJ26AHE3/5A suitable for bidirectional signal line protection?
No, the SMAJ26AHE3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias during overvoltage events and blocks forward current up to its rated IFSM. For bidirectional protection (e.g., USB, RS-485), the SMAJ26CA variant must be used. Using SMAJ26AHE3/5A on AC-coupled or symmetrical signal lines risks forward conduction and improper clamping behavior.
Does the SMAJ26AHE3/5A require derating above 25 °C ambient temperature?
Yes, the SMAJ26AHE3/5A must be derated above TA = 25 °C per Figure 2 in the datasheet. Its peak pulse power drops linearly to 300 W at 78 V and above, and thermal resistance (RθJA = 120 °C/W) necessitates reduced surge duty cycle or enhanced PCB copper area in elevated ambient conditions. Derating curves apply to both single-pulse and repetitive surge scenarios, and junction temperature must remain ≤150 °C under worst-case operating conditions.
What does the "HE3" suffix indicate in SMAJ26AHE3/5A?
The "HE3" suffix in SMAJ26AHE3/5A denotes RoHS-compliant construction with AEC-Q101 qualification. "H" indicates automotive qualification, "E3" specifies lead (Pb)-free matte tin plating meeting JESD 22-B102 solderability standards. The "/5A" denotes packaging in 13-inch tape-and-reel format with 7500 units per reel - distinct from "/61" (7-inch reel, 1800 units) and critical for SMT line feed compatibility.
How does the SMAJ26AHE3/5A compare to SMAJ26A-E3/5A in terms of reliability testing?
The SMAJ26AHE3/5A undergoes full AEC-Q101 stress testing including HTGB, H3TRB, TC, AC/DC life test, and ESD (HBM ≥8 kV, CDM ≥1 kV), whereas the SMAJ26A-E3/5A is qualified only to commercial-grade reliability standards. Both share identical electrical parameters and package dimensions, but only SMAJ26AHE3/5A carries the AEC-Q101 certificate required for automotive Tier 1 production. Field failure rate data and accelerated life models are validated exclusively for the HE3 variant.
SMAJ26AHE3/5A 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:
- 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)
SMAJ26AHE3/5A FAQ
1.How can I place an order for SMAJ26AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHE3/5A 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 SMAJ26AHE3/5A reliable?
The price and inventory of SMAJ26AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ26AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHE3/5A?
SMAJ26AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHE3/5A 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 SMAJ26AHE3/5A?
For technical support, including SMAJ26AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHE3/5A requirements.
6.How does Aetrix verify that SMAJ26AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHE3/5A 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 SMAJ26AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ26AHE3/5A?
All SMAJ26AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHE3/5A, 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 SMAJ26AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ26AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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