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Vishay General Semiconductor - Diodes Division SMAJ26AHM3_A/I
- Part No.:
- SMAJ26AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHM3_A/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,381
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Product details
Overview
SMAJ26AHM3_A/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 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 on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ26AHM3_A/I datasheet, SMAJ26AHM3_A/I pinout, SMAJ26AHM3_A/I application, or SMAJ26AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low thermal resistance (RθJL = 30 °C/W), and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This unidirectional 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 (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
The SMAJ26AHM3_A/I is rated for 40 A non-repetitive forward surge current (IFSM) and supports continuous power dissipation of 3.3 W at 50 °C ambient on infinite heatsink. Its MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility confirm suitability for automated SMT assembly in high-reliability automotive and industrial production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 42.1 V at 9.5 A - Clamped voltage seen by downstream ICs during 10/1000 μs surge; limits stress on 3.3 V or 5 V logic rails. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1 & 2a. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports protection against motor driver flyback and relay coil energy. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments and enclosed industrial enclosures. |
| RθJL | 30 °C/W - Low junction-to-lead thermal resistance; enables efficient heat transfer to PCB copper pads without external heatsinking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected line (e.g., VIN, signal trace); forms cathode-to-ground clamp path in unidirectional configuration. |
| Cathode | Current exit point during forward conduction; marked with band | Typically tied to ground or lower-potential rail; establishes clamping reference and defines polarity-sensitive protection direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-203 material requirements and EU RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life compliance. |
| 400 W peak pulse power (10/1000 μs) | Provides margin against IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted on 5 mm × 5 mm copper pads per datasheet layout. |
| Low RθJL = 30 °C/W | Enables sustained surge handling without thermal runaway; reduces need for oversized PCB copper or thermal vias in space-constrained layouts. |
| MSL Level 1, 260 °C peak reflow | Eliminates bake-out requirement prior to assembly; compatible with standard lead-free reflow profiles used in Tier-1 automotive electronics manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and chassis ground to limit transient overvoltage to <42.1 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies during ISO 7637-2 Pulse 5a (load dump up to 60 V). |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) clamps both positive and negative transients on signal return path. Use Value: Maintains signal integrity below ±15 kV contact ESD (IEC 61000-4-2) while adding <0.5 pF capacitance to avoid bandwidth degradation. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable medical monitors exposed to hospital-grade ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-VBUS, cathode-to-ground to clamp positive surges only. Use Value: Limits VBUS overshoot to ≤42.1 V during ±8 kV air discharge, preserving USB PHY compliance and preventing host controller reset. |
Use Scenario: Front-end protection of 48 V DC telecom power inputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Primary shunt suppressor placed upstream of DC-DC converter input filter to absorb bulk surge energy. Use Value: Handles 400 W peak pulse without degradation, reducing stress on downstream MOVs and enabling smaller, more reliable front-end designs. |
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_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial use only. | Select SMAJ26AHE3_A/I only if AEC-Q101 and halogen-free requirements are not mandated. |
| SMBJ26A-HM3 | Higher 600 W PPPM, SMB (DO-214AA) package - larger footprint, higher thermal mass, same VWM/VC. | Better suited for higher-energy surges (e.g., IEC 61000-4-5 Level 5); requires PCB layout change due to larger body and lead spacing. | Choose SMBJ26A-HM3 when surge energy exceeds 400 W capability and board space allows larger package. |
Compared with SMAJ26AHM3_A/I, SMAJ26AHE3_A/I offers identical clamping and breakdown but lacks automotive qualification and halogen-free status, while SMBJ26A-HM3 delivers 50 % higher surge power in a physically larger package - requiring layout revision but enabling enhanced system-level surge margin.
Availability
SMAJ26AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input protection requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SMAJ26AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of the SMAJ26AHM3_A/I under a 10/1000 μs surge?
The SMAJ26AHM3_A/I 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 per standard test conditions in the Vishay datasheet (Document Number: 88390) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ26AHM3_A/I maintains this clamping performance across its specified operating temperature range.
Is the SMAJ26AHM3_A/I qualified for automotive applications?
Yes, the SMAJ26AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision A). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness - making the SMAJ26AHM3_A/I suitable for under-hood and chassis-mounted automotive modules such as body control units and ADAS sensor interfaces.
What does the "HM3" suffix indicate in SMAJ26AHM3_A/I?
The "HM3" suffix in SMAJ26AHM3_A/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Unlike "E3" (RoHS-compliant commercial grade) or "HE3" (RoHS + AEC-Q101), "HM3" adds halogen-free compliance per JEDEC J-STD-203, critical for automotive OEMs and industrial customers with strict material content requirements. The "_A/I" denotes packaging: 13″ tape-and-reel, 7500 units per reel.
How does the SMAJ26AHM3_A/I compare to bidirectional TVS diodes in the same family?
The SMAJ26AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., VCC-to-ground). Bidirectional variants like SMAJ26CA have symmetric breakdown in both directions and are used on AC or floating signal lines. The SMAJ26AHM3_A/I offers tighter leakage control (<1.0 μA at 26 V) versus bidirectional types, which exhibit doubled ID limits per note (3) in the datasheet - making the SMAJ26AHM3_A/I preferable for low-power DC rails.
What is the thermal resistance from junction to lead (RθJL) for the SMAJ26AHM3_A/I?
The SMAJ26AHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, as specified in the Vishay thermal characteristics table. This low value enables efficient heat transfer from the silicon die to the PCB copper pads via the leads, supporting reliable operation during repetitive surge events without requiring additional thermal vias or heatsinks - a key advantage in compact automotive and industrial PCB layouts.
SMAJ26AHM3_A/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:
- 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:
- 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_A/I FAQ
1.How can I place an order for SMAJ26AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHM3_A/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_A/I reliable?
The price and inventory of SMAJ26AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ26AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHM3_A/I?
SMAJ26AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHM3_A/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_A/I?
For technical support, including SMAJ26AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ26AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ26AHM3_A/I?
All SMAJ26AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMAJ26AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26AHM3_A/I Tags
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