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Vishay General Semiconductor - Diodes Division SMAJ110AHM3/H
- Part No.:
- SMAJ110AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110AHM3/H.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,995
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Product details
Overview
SMAJ110AHM3/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 a 110 V stand-off voltage (VWM), 122–135 V breakdown voltage (VBR) at 1 mA, 177 V maximum clamping voltage (VC) at 1.7 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive electronics protection.
For engineers reviewing the SMAJ110AHM3/H datasheet, SMAJ110AHM3/H pinout, SMAJ110AHM3/H application, or SMAJ110AHM3/H equivalent, this device serves as a robust, low-profile transient suppressor for DC power rails, sensor interfaces, and automotive control modules where fast response (<1 ns), low clamping ratio, and high surge reliability are required.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown when reverse voltage exceeds its VBR range (122–135 V), limiting transient energy to safe levels before downstream components. Its 177 V clamping voltage at 1.7 A ensures tight overvoltage protection margin relative to a 110 V system rail.
Designed for surface-mount assembly on standard PCB pads (0.2" × 0.2"), it delivers 400 W peak pulse power per 10/1000 μs waveform with thermal resistance RθJA = 120 °C/W and junction temperature range of –55 °C to +150 °C - enabling reliable operation in under-hood automotive environments and industrial power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 110 V - Maximum continuous reverse operating voltage without conduction; sets system rail compatibility. |
| VBR (Breakdown Voltage) | 122–135 V at 1 mA - Avalanche onset threshold; defines minimum transient level triggering clamping action. |
| VC (Clamping Voltage) | 177 V at IPPM = 1.7 A - Peak voltage seen by protected circuit during worst-case surge; determines safety margin vs. IC absolute max rating. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy handling capacity; supports IEC 61000-4-5 Level 3/4 compliance testing. |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Unidirectional forward surge capability; relevant for accidental polarity reversal events. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient automotive and industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts avalanche current to anode during overvoltage event. |
| Anode | Reference/return path | Typically tied to ground or low-impedance return plane; completes clamping current path during surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surges up to 1 kV/2 Ω without derating below 78 V. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; suitable for green manufacturing programs. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving clamping fidelity. |
| Fast response time (<1 ns) | Activates before sensitive logic or analog circuitry sustains damage from ESD or inductive switching spikes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump (ISO 7637-2 pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients above 110 V. Use Value: Limits clamped voltage to 177 V, preserving MOSFET gate oxide integrity and MCU supply pins rated ≤200 V. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb ESD (IEC 61000-4-2 ±8 kV contact) and cable discharge events. Use Value: Sub-1 ns response prevents latch-up in op-amps and ADC front-ends while maintaining signal integrity below 110 V operating range. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Protection |
|
Use Scenario: Safeguarding buck converter inputs in telecom power systems exposed to lightning-induced surges on -48 V distribution lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of input filter capacitor and controller IC. Use Value: Withstands 400 W pulses without degradation, ensuring long-term reliability across >100,000 surge events per MIL-STD-883H Method 3015.7. |
Use Scenario: Front-end protection for Ethernet PHY interfaces in outdoor base station equipment. IC Role / Device Role / Timing Role: Unidirectional TVS used in conjunction with common-mode chokes to suppress differential-mode surges on data pairs. Use Value: 177 V clamping voltage aligns with IEEE 802.3af PoE+ isolation barriers, preventing breakdown of magnetics and PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A-M3/61 | Same electrical specs but commercial-grade (non-AEC-Q101); uses same HM3 halogen-free formulation but lacks automotive qualification testing. | Approved for industrial/commercial power supplies only; not permitted in automotive OEM BOMs requiring AEC-Q101 evidence. | Select when cost sensitivity outweighs automotive qualification needs and ambient temperature stays ≤125 °C. |
| SMCJ110A-H | Higher 1500 W peak power rating (SMC package), 122–135 V VBR, 193 V VC at 7.8 A - larger footprint, higher thermal mass. | Better suited for high-energy surges (e.g., AC mains coupling, heavy industrial motor drives) where PCB space allows DO-214AB. | Choose when system-level surge testing exceeds 400 W or requires >10× longer pulse duration immunity (e.g., IEC 61000-4-5 1.2/50 μs). |
Compared with SMAJ110A-M3/61, SMAJ110AHM3/H adds AEC-Q101 validation and extended temperature assurance; compared with SMCJ110A-H, it trades surge capacity for compactness and lower parasitic inductance - making SMAJ110AHM3/H optimal for space-constrained automotive modules needing certified reliability.
Availability
SMAJ110AHM3/H is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ110AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in automotive and industrial environments, delivering consistent clamping behavior across temperature and lifetime under repetitive surge stress.
FAQ
What is the clamping voltage of SMAJ110AHM3/H at its rated peak pulse current?
The SMAJ110AHM3/H has a maximum clamping voltage (VC) of 177 V at its specified peak pulse current (IPPM) of 1.7 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ110AHM3/H maintains this clamping performance without degradation after repeated surges within its rated duty cycle.
Is SMAJ110AHM3/H suitable for bidirectional transient protection?
No, SMAJ110AHM3/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias above VBR and blocks forward current like a standard diode. For bidirectional protection, Vishay offers the SMAJ110CA variant - which lacks polarity marking and clamps symmetrically in both directions. Using SMAJ110AHM3/H in place of a bidirectional device would leave positive-going transients unprotected.
Does SMAJ110AHM3/H meet automotive qualification standards?
Yes, SMAJ110AHM3/H is explicitly AEC-Q101 qualified, as confirmed by the "HM3" suffix and Vishay documentation (Document Number 88390, Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive applications.
What is the thermal resistance of SMAJ110AHM3/H from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ110AHM3/H is 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value assumes still air conditions and directly impacts maximum allowable power dissipation at elevated ambient temperatures - for example, at TA = 85 °C, the device's usable power derates to approximately 2.7 W based on TJ max. = 150 °C.
How does the halogen-free construction of SMAJ110AHM3/H affect its solderability and reliability?
SMAJ110AHM3/H uses halogen-free molding compound and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, ensuring robust wetting and intermetallic formation during lead-free reflow (peak 260 °C). Its halogen-free status meets IPC-1752A reporting requirements and eliminates corrosive decomposition products during high-temp operation or fire scenarios - enhancing long-term reliability in sealed enclosures and conformal-coated assemblies.
SMAJ110AHM3/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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ110AHM3/H FAQ
1.How can I place an order for SMAJ110AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110AHM3/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 SMAJ110AHM3/H reliable?
The price and inventory of SMAJ110AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ110AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110AHM3/H?
SMAJ110AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110AHM3/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 SMAJ110AHM3/H?
For technical support, including SMAJ110AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110AHM3/H requirements.
6.How does Aetrix verify that SMAJ110AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ110AHM3/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 SMAJ110AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ110AHM3/H?
All SMAJ110AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110AHM3/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 SMAJ110AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ110AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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