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Vishay General Semiconductor - Diodes Division SMAJ26AHE3_A/H
- Part No.:
- SMAJ26AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHE3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,190
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Product details
Overview
SMAJ26AHE3_A/H 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 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 - ideal for protecting MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMAJ26AHE3_A/H datasheet, SMAJ26AHE3_A/H pinout, SMAJ26AHE3_A/H application, or SMAJ26AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, fast response time, and compatibility with automated SMT placement on consumer, industrial, and automotive PCBs requiring reliable unidirectional surge suppression.
Technical Context
This TVS diode operates as a unidirectional clamping device: under normal conditions it presents high impedance above its 26 V reverse standoff voltage (VWM), then rapidly transitions to low-impedance conduction when transient voltage exceeds its 28.9–31.9 V breakdown threshold (VBR). Its 42.1 V clamping voltage at 9.5 A ensures downstream circuitry remains below safe operating limits during standardized 10/1000 μs surges.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with 120 °C/W junction-to-ambient thermal resistance (RθJA) and 30 °C/W junction-to-lead (RθJL), enabling use on standard 0.2" × 0.2" copper pads without forced cooling. The matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and the device is rated MSL Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse voltage before leakage exceeds 1 μA; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - Confirmed voltage range where device enters avalanche conduction; tight tolerance enables predictable protection threshold. |
| VC (Clamping Voltage) | 42.1 V at 9.5 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; critical for ensuring downstream ICs remain within absolute maximum ratings. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability for non-repetitive transients; derates to 300 W above 78 V, but fully applicable at 26 V. |
| IFSM (Surge Current) | 40 A - Single half-sine 8.3 ms forward surge rating (unidirectional only); supports inrush or fault-current scenarios without failure. |
| TJ max. | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive or high-ambient industrial environments. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until breakdown, then clamps positive transients to ground. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case meeting UL 94 V-0 flammability rating. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal or power line; conducts surge current toward cathode during overvoltage events. |
| Cathode | Ground/reference terminal | Marked with band; tied to system ground or low-impedance return path; establishes unidirectional clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS, and infotainment systems. |
| 400 W peak pulse power (10/1000 μs) | Provides industry-standard surge immunity per IEC 61000-4-5; protects against lightning-induced and inductive-switching transients without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping - reduces stress on downstream MOSFETs and logic ICs compared to higher-ratio TVS devices. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable electrical characteristics over time and temperature; prevents parameter drift due to environmental exposure or long-term bias stress. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes on 5 V or 12 V sensor supply rails before they reach precision ADC front-ends. Use Value: Maintains signal integrity by limiting voltage excursions to ≤42.1 V during 9.5 A surges, preventing ADC saturation or latch-up in AEC-Q100-compliant signal chains. |
Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Fast-response shunt protector placed between isolated 24 V DC input and optocoupler input stage. Use Value: Clamps 10/1000 μs surges to 42.1 V within nanoseconds, preserving optocoupler CTR stability and avoiding false triggering in safety-critical control loops. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
Use Scenario: Safeguarding USB-C PD port output stages in wall adapters against output short-circuit recovery spikes and ESD events. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 5–20 V output rail, positioned after DC-DC controller and before connector. Use Value: Absorbs up to 400 W of transient energy without failure, ensuring compliance with IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) while maintaining low standby leakage (<1 μA). |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI pairs) in VoIP gateways from lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on each data line referenced to chassis ground, coordinated with common-mode chokes. Use Value: Limits differential-mode overvoltage to ≤42.1 V during 10/1000 μs surges, preventing PHY latch-up and enabling interoperability with IEEE 802.3af/at PoE standards. |
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 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101 qualified). | Lacks automotive qualification; not recommended for under-hood or safety-critical vehicle subsystems. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation. |
| SMBJ26AHE3_A/H | Same VWM (26 V), VBR (28.9–31.9 V), and VC (42.1 V), but in larger SMB (DO-214AA) package with 600 W PPPM rating. | Higher power handling allows longer surge duration or repeated events; requires larger PCB footprint. | Choose when system-level surge testing exceeds 400 W or when thermal margin must be increased via larger copper area. |
Compared with SMAJ26A-E3/61, SMAJ26AHE3_A/H adds AEC-Q101 qualification for automotive use; compared with SMBJ26AHE3_A/H, it trades 200 W peak power headroom for 30% smaller board area - making SMAJ26AHE3_A/H optimal for space-constrained, automotive-grade 26 V rail protection.
Availability
SMAJ26AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter outputs requiring stable component supply across multi-year production cycles.
Supply support for SMAJ26AHE3_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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping behavior and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ26AHE3_A/H at its rated peak pulse current?
The SMAJ26AHE3_A/H has a maximum clamping voltage (VC) of 42.1 V at its specified peak pulse current (IPPM) of 9.5 A, measured using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain within safe voltage limits during surge events. The clamping performance is validated per ANSI/IEEE C62.35 and confirmed in Vishay's official datasheet revision 09-Jan-2024.
Is SMAJ26AHE3_A/H suitable for automotive applications?
Yes, SMAJ26AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock - specifically intended for automotive use. Its construction, glass passivated junction, and MSL Level 1 rating make it appropriate for engine control units, body electronics, and ADAS sensor modules where reliability under thermal and vibration stress is critical. The "HE3" suffix explicitly denotes this qualification.
How does the SMAJ26AHE3_A/H differ from the SMAJ26A-E3/61 variant?
The SMAJ26AHE3_A/H and SMAJ26A-E3/61 share identical electrical parameters (VWM = 26 V, VBR = 28.9–31.9 V, VC = 42.1 V) and SMA package, but SMAJ26AHE3_A/H is AEC-Q101 qualified while SMAJ26A-E3/61 is commercial-grade only. The HE3 version undergoes additional automotive-specific qualification testing and is marked with "HE3" to indicate compliance. Both are RoHS-compliant, but only SMAJ26AHE3_A/H is approved for under-hood or safety-related vehicle systems.
What is the thermal resistance of SMAJ26AHE3_A/H, and how does it affect PCB layout?
SMAJ26AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per terminal. This means effective heat dissipation relies on adequate copper area: reducing pad size increases RθJA and risks exceeding the +150 °C max junction temperature during repetitive surges. Layout should follow Vishay's recommended mounting pad dimensions (4.93 mm × 3.99 mm) and avoid thermal isolation of the leads.
Can SMAJ26AHE3_A/H be used in bidirectional protection circuits?
No - SMAJ26AHE3_A/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias (anode-to-ground configuration) and blocks forward current. For bidirectional protection, the "CA" variant (e.g., SMAJ26CAHE3_A/H) must be used, which provides symmetrical clamping in both polarities. Using SMAJ26AHE3_A/H in a bidirectional application would leave positive-going transients unprotected.
SMAJ26AHE3_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:
- 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_A/H FAQ
1.How can I place an order for SMAJ26AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHE3_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 SMAJ26AHE3_A/H reliable?
The price and inventory of SMAJ26AHE3_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 SMAJ26AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ26AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHE3_A/H?
SMAJ26AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHE3_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 SMAJ26AHE3_A/H?
For technical support, including SMAJ26AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ26AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHE3_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 SMAJ26AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ26AHE3_A/H?
All SMAJ26AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHE3_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 SMAJ26AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ26AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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