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Vishay General Semiconductor - Diodes Division SMAJ45CAHM3_A/H
- Part No.:
- SMAJ45CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHM3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ45CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ45CAHM3_A/H datasheet, SMAJ45CAHM3_A/H pinout, SMAJ45CAHM3_A/H application, or SMAJ45CAHM3_A/H equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for bidirectional overvoltage protection where low-profile mounting, fast response (<1 ns), and stable clamping under repetitive surges are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable leakage performance (≤1.0 μA at VWM) and robust surge handling up to 5.5 A (10/1000 μs), while maintaining low incremental surge resistance for effective clamping.
The device is rated for continuous power dissipation of 3.3 W on an infinite heatsink at 50 °C and supports operating junction temperatures from –55 °C to +150 °C. Its thermal resistance (junction-to-ambient) is 120 °C/W, and it meets MSL Level 1 per J-STD-020 with a 260 °C reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche breakdown; ensures predictable turn-on behavior. |
| VC (Clamping Voltage) | 72.7 V at IPPM = 5.5 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Sustained transient energy absorption capability without failure; enables protection against IEC 61000-4-5 level 4 surges. |
| IPPM (Peak Pulse Current) | 5.5 A - Maximum non-repetitive surge current the device can safely clamp; derived from VC and PPPM (P = V × I). |
| TJmax | +150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path terminal | Either terminal accepts transient current in either direction; no cathode band marking; terminals interchangeable in layout. |
| Case / Body | Thermal and mechanical interface | Plastic molded body with UL 94 V-0 flammability rating; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns-e.g., CAN bus, RS-485, or sensor differential pairs. |
| 400 W peak pulse power (10/1000 μs) | Supports robust immunity to lightning-induced surges and inductive switching transients in automotive power distribution and industrial PLC I/O modules. |
| AEC-Q101 qualified & halogen-free | Validated for automotive-grade reliability (HTOL, TC, UHAST); HM3 suffix confirms halogen-free resin and RoHS compliance for Tier 1 supply chain requirements. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs-e.g., keeps 3.3 V or 5 V logic inputs within safe absolute maximum ratings during surge events. |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and allows standard lead-free reflow profiles without baking or special handling. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs and lighting control modules from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail and ground to clamp ±100 V spikes to ≤73 V within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and MOSFET drivers without adding series impedance or affecting steady-state regulation. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) in factory automation equipment. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) bidirectional clamp on differential or single-ended signal traces near connector entry points. Use Value: Maintains signal integrity up to 1 MHz while suppressing ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4) without distorting rise/fall times. |
| Telecom Data Line Surge Suppression | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding Ethernet PHY interfaces, PoE injectors, and DSL line drivers from induced surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary-level TVS on unshielded twisted-pair (UTP) lines, coordinated with secondary GDT or polymer PTC devices. Use Value: Limits let-through energy to <10 mJ per event, enabling reliable operation of 100BASE-TX magnetics and PHY transceivers under repeated surge exposure. |
Use Scenario: Guarding microcontroller GPIOs and H-bridge gate drivers in washing machine motor control boards exposed to brush-commutator noise. IC Role / Device Role / Timing Role: Localized clamp adjacent to motor driver ICs, absorbing commutation spikes before they propagate into logic domains. Use Value: Reduces system-level reset events and extends MCU lifetime by limiting transient-induced bit flips and brownouts in embedded firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs HM3 resin). | Approved for commercial/industrial use; lacks halogen-free certification required for some automotive OEMs. | Select when halogen-free content is not mandated and cost optimization is prioritized. |
| SMBJ45CAHM3_A/H | Same VWM, VBR, VC; higher PPPM = 600 W due to larger SMB (DO-214AA) package. | Requires larger PCB footprint; better suited for high-energy surge zones (e.g., main power input) where 400 W is marginal. | Choose when system-level surge testing exceeds IEC 61000-4-5 level 3 and additional margin is needed. |
Compared with SMAJ45CAHM3_A/H, SMAJ45CAHE3_A/H offers identical protection performance without halogen-free compliance, while SMBJ45CAHM3_A/H delivers 50 % higher surge power handling in a physically larger package-enabling design flexibility between space-constrained layouts and higher-energy threat environments.
Availability
SMAJ45CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom data line protection requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified reliability.
Supply support for SMAJ45CAHM3_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 optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-reliability, surface-mount transient suppression in space-constrained automotive and industrial systems-balancing low profile, fast response, and AEC-Q101 qualification from wafer through assembly.
FAQ
What is the clamping voltage of SMAJ45CAHM3_A/H at its rated peak pulse current?
The SMAJ45CAHM3_A/H has a maximum clamping voltage (VC) of 72.7 V at a peak pulse current (IPPM) of 5.5 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 surge events. The SMAJ45CAHM3_A/H maintains this clamping performance consistently due to its glass-passivated junction and low dynamic impedance.
Is SMAJ45CAHM3_A/H suitable for automotive applications?
Yes, SMAJ45CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant construction and validation across temperature cycling, humidity testing, and high-temperature operating life. It is commonly deployed in body control modules, infotainment power rails, and ADAS sensor interfaces where bidirectional transient suppression and long-term reliability are mandatory. The SMAJ45CAHM3_A/H meets OEM requirements for under-hood and cabin-mounted electronics.
How does the bidirectional design of SMAJ45CAHM3_A/H affect PCB layout?
The SMAJ45CAHM3_A/H has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout-no silkscreen polarity indicators are needed, and routing symmetry is optional. Engineers can place the SMAJ45CAHM3_A/H directly across differential lines (e.g., CAN_H/CAN_L) or between any two nodes requiring mutual surge protection. Its DO-214AC footprint remains identical to unidirectional variants, enabling shared land patterns in mixed-design boards.
What is the maximum steady-state power dissipation for SMAJ45CAHM3_A/H?
The SMAJ45CAHM3_A/H has a maximum steady-state power dissipation (PD) of 3.3 W when mounted on an infinite heatsink at ambient temperature of 50 °C. In typical PCB applications with 0.2" × 0.2" copper pads per terminal, derating applies above 25 °C ambient-per Figure 2 in the Vishay datasheet. This rating governs continuous leakage-related heating and must be verified alongside expected reverse leakage (≤1.0 μA at 45 V) in low-power always-on circuits. The SMAJ45CAHM3_A/H is not intended for sustained DC power dissipation.
Does SMAJ45CAHM3_A/H meet JEDEC moisture sensitivity requirements?
Yes, SMAJ45CAHM3_A/H meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means the device can be stored indefinitely at standard ambient conditions without baking and processed using standard lead-free reflow profiles. The molding compound and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and whisker resistance meets JESD 201 Class 2. These attributes are confirmed for the HM3 suffix variant of the SMAJ45CAHM3_A/H.
SMAJ45CAHM3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ45CAHM3_A/H FAQ
1.How can I place an order for SMAJ45CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHM3_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 SMAJ45CAHM3_A/H reliable?
The price and inventory of SMAJ45CAHM3_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 SMAJ45CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHM3_A/H?
SMAJ45CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHM3_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 SMAJ45CAHM3_A/H?
For technical support, including SMAJ45CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ45CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHM3_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 SMAJ45CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHM3_A/H?
All SMAJ45CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHM3_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 SMAJ45CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ45CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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