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Vishay General Semiconductor - Diodes Division SMAJ26AHM3_A/H
- Part No.:
- SMAJ26AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AHM3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,916
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Product details
Overview
SMAJ26AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails 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, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for safeguarding automotive ECUs and industrial sensor interfaces against ESD and load dump transients.
For engineers reviewing the SMAJ26AHM3_A/H datasheet, SMAJ26AHM3_A/H pinout, SMAJ26AHM3_A/H application, or SMAJ26AHM3_A/H equivalent, this part delivers AEC-Q101 qualified reliability, halogen-free RoHS compliance, and verified clamping performance under repetitive surge conditions - critical for high-reliability 12 V/24 V automotive and industrial power rail protection designs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 26 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the SMA package supports automated SMT placement and meets MSL Level 1 (260 °C reflow).
The device sustains 40 A non-repetitive forward surge current (IFSM) and exhibits 0.097 %/°C temperature coefficient of VBR, enabling predictable clamping behavior across –55 °C to +150 °C operating junction range. Thermal resistance is RθJA = 120 °C/W (on 0.2" × 0.2" copper pads), supporting reliable power dissipation up to 3.3 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - maximum continuous reverse voltage before significant leakage; sets protection threshold for 24 V nominal systems |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - guaranteed avalanche onset range; ensures consistent triggering without premature conduction |
| VC (Clamping Voltage) | 42.1 V at IPPM = 9.5 A - limits transient voltage seen by downstream ICs during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W - handles standard lightning/inductive-switching surges per IEC 61000-4-5; derated to 300 W above 78 V |
| IFSM (Surge Current) | 40 A - withstands 8.3 ms half-sine wave surges common in automotive load-dump events |
| TJmax | +150 °C - enables operation in under-hood automotive environments and high-temperature industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard 2-pin surface-mount outline with cathode band marking; footprint compatible with automated pick-and-place |
Pinout & Package
Package: SMA (DO-214AC), 2-terminal surface-mount case with molded epoxy body, matte tin-plated leads, and visible cathode band on unidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Completes shunt path during avalanche; must be routed with low-inductance trace to minimize clamping overshoot |
| Cathode | High-side connection to protected line (e.g., 24 V rail or signal input) | Marked by band; reverse-biased during normal operation; conducts surge current to anode when VIN > VC |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance - suitable for green manufacturing and export compliance |
| 400 W peak pulse power (10/1000 μs) | Provides margin against ISO 7637-2 Pulse 1/2a/5a transients and IEC 61000-4-5 Level 3 surges in 24 V systems |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping - protects 30 V-rated MOSFETs and 3.3 V/5 V interface ICs downstream |
| Fast response time (<1 ps) | Activates before most semiconductor damage thresholds are exceeded - critical for protecting high-speed CAN/LIN transceivers |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs of engine control units (ECUs) and body control modules (BCMs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and system input filter capacitor. Use Value: Clamps transients to ≤42.1 V, preventing damage to upstream DC-DC controllers and downstream microcontrollers rated for 30 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to signal line, anode to ground) suppressing ESD and cable discharge events. Use Value: Limits induced voltage spikes to <45 V, preserving 24 V-rated op-amp input stages and ADC front-ends without adding series impedance. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding primary-side DC bus of PoE-powered network switches and base stations from lightning-induced surges on AC/DC adapter inputs. IC Role / Device Role / Timing Role: First-line transient suppressor mounted directly at board edge connector, upstream of bulk capacitance and fuse. Use Value: Absorbs 400 W surge energy within 1000 μs, reducing stress on downstream MOVs and enabling smaller, lower-cost secondary-stage protection. |
Use Scenario: Protecting gate drivers and bootstrap circuits in BLDC motor inverters used in HVAC compressors and washing machine drives. IC Role / Device Role / Timing Role: Clamp diode across high-side gate resistor or bootstrap capacitor to suppress Miller-induced voltage spikes during switching transitions. Use Value: Prevents false turn-on of high-side MOSFETs by limiting dv/dt-induced gate voltage excursions to safe levels below 20 V. |
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/H | Same electrical specs and package, but RoHS-compliant commercial grade (not halogen-free); no AEC-Q101 qualification | Approved for non-automotive industrial and consumer use only; not acceptable for automotive PPAP submissions | Select when halogen-free content or automotive qualification is not required - lower cost and broader distributor stock |
| SMBJ26A-HM3 | Higher 600 W PPPM, same VWM/VC, but SMB (DO-214AA) package - 2.5 mm wider, 0.5 mm taller than SMA | Requires PCB layout change; better suited for higher-energy surges where space permits larger footprint | Choose when system-level surge testing exceeds 400 W requirements or when thermal margin must be increased via larger pad area |
Compared with SMAJ26AHM3_A/H, SMAJ26AHE3_A/H offers identical protection performance without halogen-free or automotive qualification, while SMBJ26A-HM3 provides higher surge capacity at the cost of larger board area - making SMAJ26AHM3_A/H the optimal balance of AEC-Q101 compliance, halogen-free construction, and compact SMA footprint for space-constrained automotive modules.
Availability
SMAJ26AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply inputs requiring stable component supply, long-term lifecycle support, and AEC-Q101 validated reliability.
Supply support for SMAJ26AHM3_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, MOSFETs, and protection devices with emphasis on high-reliability, automotive-grade, and industry-standard solutions.
The SMAJ series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where repeatable clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ26AHM3_A/H at its rated peak pulse current?
The SMAJ26AHM3_A/H has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 9.5 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value ensures downstream components see limited overvoltage during transient events, and it is guaranteed across the full operating temperature range per Vishay's datasheet revision 09-Jan-2024. The SMAJ26AHM3_A/H maintains this clamping performance consistently due to its glass-passivated junction and controlled avalanche characteristics.
Is SMAJ26AHM3_A/H qualified for automotive applications?
Yes, SMAJ26AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMAJ26AHM3_A/H meets the reliability and traceability requirements for Tier 1 automotive suppliers and supports PPAP documentation packages when sourced through authorized channels.
What does the "HM3" suffix indicate in SMAJ26AHM3_A/H?
The "HM3" suffix in SMAJ26AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from "HE3" (RoHS-compliant + AEC-Q101, but not halogen-free) and "E3/M3" (commercial-grade only). This suffix confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance, UL 94 V-0 flammability rating, and material restrictions per Vishay document 99912. The SMAJ26AHM3_A/H is therefore approved for green manufacturing and export to regions enforcing halogen bans, such as the EU and South Korea.
Can SMAJ26AHM3_A/H be used in bidirectional protection circuits?
No, SMAJ26AHM3_A/H is a unidirectional TVS diode, indicated by the "A" (not "CA") in its part number and the presence of a cathode band marking. It conducts only in reverse bias and blocks forward current - making it unsuitable for AC or symmetrical transient protection. For bidirectional applications, the SMAJ26CA family (e.g., SMAJ26CAHM3_A/H) must be selected. Using SMAJ26AHM3_A/H in place of a bidirectional variant would leave positive-going transients unprotected and risk catastrophic failure.
What is the maximum operating temperature for SMAJ26AHM3_A/H?
The SMAJ26AHM3_A/H has a specified operating junction temperature range of –55 °C to +150 °C, with thermal resistance RθJA = 120 °C/W when mounted on 0.2" × 0.2" copper pads. At 50 °C ambient, its 3.3 W power dissipation rating allows continuous operation without derating. This wide range enables deployment in under-hood automotive locations, industrial motor drives, and outdoor telecom equipment - all environments where the SMAJ26AHM3_A/H maintains stable clamping behavior and low leakage current.
SMAJ26AHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ26AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AHM3_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 SMAJ26AHM3_A/H reliable?
The price and inventory of SMAJ26AHM3_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 SMAJ26AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ26AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AHM3_A/H?
SMAJ26AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AHM3_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 SMAJ26AHM3_A/H?
For technical support, including SMAJ26AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ26AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26AHM3_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 SMAJ26AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ26AHM3_A/H?
All SMAJ26AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AHM3_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 SMAJ26AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ26AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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