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Vishay General Semiconductor - Diodes Division SMAJ26AHM3/H
- Part No.:
- SMAJ26AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHM3/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,124
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Product details
Overview
SMAJ26AHM3/H 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 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), 9.5 A peak pulse current (IPPM), and 42.1 V maximum clamping voltage (VC) - deployed in automotive ECUs, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the SMAJ26AHM3/H datasheet, SMAJ26AHM3/H pinout, SMAJ26AHM3/H application, or SMAJ26AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy to ground while limiting downstream voltage to ≤42.1 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at 26 V) and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O pins.
The SMAJ26AHM3/H is rated for 400 W peak pulse power (10/1000 μs waveform) up to 78 V; above that, derated to 300 W. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimum 0.2" × 0.2" copper pads per terminal for full power handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 42.1 V - Clamped voltage during 9.5 A transient, defining protected circuit's worst-case overvoltage |
| PPPM | 400 W - Peak surge power handling capability with 10/1000 μs waveform, duty cycle ≤0.01 % |
| IPPM | 9.5 A - Maximum non-repetitive surge current the device safely conducts without failure |
| TJ max | +150 °C - Maximum allowable junction temperature, enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking, MSL Level 1 |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to ground or low-impedance return path to shunt surge current away from protected IC |
| Anode (unbanded end) | Protected line input | Connected to power rail or signal line requiring clamping; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC JS709E and IPC-1752A material declarations |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) protection on 12 V/24 V systems with proper PCB layout |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream components compared to higher-ratio suppressors |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60 % RH; compatible with standard reflow profiles up to 260 °C peak |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply rail against load dump and inductive switching spikes from solenoids and relays. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp transients before regulation. Use Value: Limits voltage to ≤42.1 V during 9.5 A surges, preventing LDO thermal shutdown and MCU brownout. | Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb fast transients before optocoupler or Schmitt trigger input stage. Use Value: Enables robust immunity to IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without additional filtering components. |
| Automotive Infotainment Power Supply | Smart Sensor Node (CAN/LIN Bus) |
Use Scenario: Clamping 5 V/3.3 V auxiliary rails feeding audio codecs and display drivers against coupled noise from RF modules. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary DC/DC converter, targeting high-frequency transients missed by bulk capacitance. Use Value: Maintains clean supply during GSM burst transmission by suppressing sub-100 ns spikes with <1 ns response. | Use Scenario: Protecting LIN bus transceiver pins from cable discharge events and ground bounce in distributed sensor networks. IC Role / Device Role / Timing Role: Unidirectional TVS on LIN TX/RX lines referenced to local ground, leveraging low VC to preserve signal integrity. Use Value: Ensures bus communication remains functional after ±30 kV contact ESD per ISO 10605, with no latch-up or parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26AHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks HM3 material certification | Acceptable for commercial/industrial use where halogen-free requirement is not mandated | Select if cost-sensitive and AEC-Q101 not required; verify board-level flame rating compatibility |
| SMBJ26A-H | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings | Better suited for higher-energy transients; requires larger PCB footprint and different pad layout | Choose when surge threat level exceeds 400 W or thermal margin is constrained by ambient conditions |
Compared with SMAJ26AHM3/H, SMAJ26AHE3/H offers identical clamping performance without halogen-free assurance, while SMBJ26A-H delivers 50 % higher surge capacity at the cost of increased size and layout revision - making SMAJ26AHM3/H optimal for space-constrained AEC-Q101 automotive designs.
Availability
SMAJ26AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and smart sensor deployments requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ26AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom infrastructure where AEC-Q101 qualification, low clamping voltage, and automated assembly compatibility are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ26AHM3/H?
The HM3 suffix in SMAJ26AHM3/H denotes halogen-free, RoHS-compliant construction meeting JEDEC JS709E requirements, plus AEC-Q101 qualification for automotive applications. It also specifies tape-and-reel packaging (H = 7-inch reel, 1800 units), distinguishing it from commercial-grade E3/M3 variants and non-automotive HE3 versions. This makes SMAJ26AHM3/H suitable for under-hood and safety-critical modules.
How does SMAJ26AHM3/H perform under repeated surge stress?
SMAJ26AHM3/H is rated for repetitive surges at 0.01 % duty cycle (e.g., one 10/1000 μs pulse per 10 s). At 25 °C ambient, it handles 400 W pulses; above 78 V, derating applies. Its glass-passivated junction and 150 °C TJ max ensure stable performance across 10,000+ surge events when mounted on recommended 0.2" × 0.2" copper pads - verified per AEC-Q101 stress tests.
Can SMAJ26AHM3/H be used in bidirectional configurations?
No - SMAJ26AHM3/H is strictly unidirectional, as confirmed by its part number suffix 'A' and cathode band marking. Bidirectional variants carry 'CA' suffixes (e.g., SMAJ26CA). Using SMAJ26AHM3/H in bidirectional circuits would result in forward conduction during negative transients, causing failure. For AC or dual-polarity protection, select SMAJ26CAHM3/H instead.
What is the maximum PCB copper area needed for full 400 W rating of SMAJ26AHM3/H?
To achieve the full 400 W peak pulse power rating, SMAJ26AHM3/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay Document 88390. Smaller pads reduce thermal dissipation, lowering effective surge capability - e.g., 0.1" × 0.1" pads may limit sustained rating to ~250 W. Thermal simulation or empirical testing is recommended for custom layouts.
Is SMAJ26AHM3/H compatible with lead-free reflow processes?
Yes - SMAJ26AHM3/H meets J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C, fully compatible with standard lead-free SAC305 profiles. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, ensuring reliable wetting and joint integrity. No pre-baking is required due to its moisture sensitivity classification.
SMAJ26AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ26AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHM3/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 SMAJ26AHM3/H reliable?
The price and inventory of SMAJ26AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ26AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHM3/H?
SMAJ26AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHM3/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 SMAJ26AHM3/H?
For technical support, including SMAJ26AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHM3/H requirements.
6.How does Aetrix verify that SMAJ26AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHM3/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 SMAJ26AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ26AHM3/H?
All SMAJ26AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHM3/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 SMAJ26AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ26AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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