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Vishay General Semiconductor - Diodes Division SMAJ45HE3/61
- Part No.:
- SMAJ45HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45HE3/61.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,242
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Product details
Overview
SMAJ45HE3/61 from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 45 V stand-off voltage (VWM), 80.3 V maximum clamping voltage (VC) at 5.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - optimized for protecting MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMAJ45HE3/61 datasheet, SMAJ45HE3/61 pinout, SMAJ45HE3/61 application, or SMAJ45HE3/61 equivalent, this device delivers verified clamping performance, RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and automotive-grade reliability validated per JESD201 Class 2 whisker testing - critical for under-hood electronics and safety-critical subsystems.
Technical Context
This unidirectional TVS diode operates with a breakdown voltage (VBR) of 50.0–61.1 V at 1.0 mA test current, ensuring precise turn-on behavior above system operating voltage. Its low incremental surge resistance enables rapid energy diversion during transients, while the glass-passivated junction ensures stable parametric performance across temperature.
The device sustains 40 A non-repetitive forward surge current (IFSM) for 8.3 ms half-sine wave and maintains operation from –55 °C to +150 °C junction temperature. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2 × 0.2" copper pads - confirming suitability for compact, thermally constrained PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin above 36 V automotive rail systems. |
| VC @ IPPM | 80.3 V - Clamped voltage at 5.0 A peak pulse current; defines worst-case stress imposed on protected downstream circuitry. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; supports robust immunity to ISO 7637-2 Pulse 1/2a/2b and IEC 61000-4-5 surges. |
| IPPM | 5.0 A - Peak pulse current corresponding to VC; derived from 400 W / 80.3 V; confirms energy-handling capability under standardized surge conditions. |
| TJ Range | –55 °C to +150 °C - Full automotive temperature range compliance; enables deployment in engine control units and transmission modules. |
| Package | DO-214AC (SMA) - Surface-mount package with 0.208" x 0.157" footprint; compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1. |
| Qualification | AEC-Q101 qualified - Certified for automotive applications; includes JESD201 Class 2 whisker resistance and 100% surge-tested screening. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; matte tin-plated leads; 0.208" length × 0.157" width × 0.090" height; terminals solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (non-banded end) | Connects to system ground or lower-potential node; conducts during reverse-transient suppression when cathode is biased positive. |
| Cathode | Reverse-biased terminal (banded end) | Connects to protected line (e.g., CAN_H, LIN, sensor supply); initiates avalanche breakdown when voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 certified with JESD201 Class 2 whisker resistance - ensures long-term reliability in vibration-prone, high-temperature vehicle environments. |
| Clamping ratio | VC/VWM = 1.78 - low ratio indicates efficient voltage limiting; minimizes overvoltage exposure to sensitive 48 V or 36 V logic interfaces. |
| Surge robustness | 400 W peak pulse power (10/1000 µs) - withstands repeated load-dump and inductive-switching events without parameter shift or failure. |
| Thermal performance | RθJA = 120 °C/W on 0.2" × 0.2" copper pads - enables thermal management in space-constrained ECUs without heatsinking. |
| Manufacturing compatibility | MSL Level 1, 260 °C reflow capable, tape-and-reel (61 code) - supports high-volume SMT assembly with zero bake requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V/48 V power rails in body control modules against ISO 7637-2 load dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp transients before regulation. Use Value: Limits voltage excursion to ≤80.3 V during 400 W surges, preventing LDO overvoltage shutdown and preserving MCU uptime. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to absorb ESD and cable discharge events. Use Value: Sub-1 ns response time and 5.0 µA max leakage at 45 V ensure no signal distortion during normal operation while blocking >8 kV HBM transients. |
| Automotive CAN Transceiver Interface | Motor Drive Gate Driver Protection |
Use Scenario: Shielding CAN_H/CAN_L lines in ADAS domain controllers from coupled transients during ignition or alternator switching. IC Role / Device Role / Timing Role: Paired unidirectional SMAJ45HE3/61 devices (one per line) referenced to ground to suppress common-mode surges. Use Value: 80.3 V clamping prevents CAN transceiver damage while maintaining bus integrity - validated per SAE J1113-45. |
Use Scenario: Protecting high-side gate drivers in 48 V BLDC motor inverters from Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: TVS placed between gate and source of SiC MOSFETs to clamp dv/dt-induced overshoot. Use Value: Low clamping voltage (80.3 V) avoids false turn-on of gate driver, preserving PWM fidelity and preventing shoot-through faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3/61 | Lower VBR range (50.0–55.3 V) and reduced VC (72.7 V); same package and AEC-Q101 qualification. | Better suited for tighter-margin 42 V nominal systems where lower clamping is prioritized over higher VWM headroom. | Select SMAJ45AHE3/61 if system VMAX is ≤42 V and clamping voltage must stay below 75 V. |
| SMCJ45HE3/61 | Same VWM (45 V) but larger DO-214AB (SMC) package; 1500 W PPPM, 33.3 A IPPM, and 79.4 V VC. | Targeted at higher-energy surge environments (e.g., alternator load dump) requiring greater power dissipation than SMAJ45HE3/61 provides. | Choose SMCJ45HE3/61 only when PCB layout allows larger footprint and surge threat level exceeds 400 W. |
Compared with SMAJ45HE3/61, SMAJ45AHE3/61 offers lower clamping at the cost of reduced standoff margin, while SMCJ45HE3/61 trades board space for 3.75× higher surge power handling - making SMAJ45HE3/61 the optimal balance of size, clamping, and automotive qualification for mid-tier transient protection.
Availability
SMAJ45HE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and 48 V power distribution systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ45HE3/61 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with global manufacturing and quality systems certified to IATF 16949.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, tight parametric tolerances, and compatibility with high-speed SMT assembly - directly addressing design needs in engine management, ADAS, and smart factory equipment.
FAQ
What is the clamping voltage of SMAJ45HE3/61 under standard test conditions?
The SMAJ45HE3/61 has a maximum clamping voltage (VC) of 80.3 V at 5.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by protected circuitry during surge events - critical for validating interface IC survivability in 48 V automotive architectures.
Is SMAJ45HE3/61 suitable for use in automotive applications?
Yes, SMAJ45HE3/61 is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C, with JESD201 Class 2 whisker resistance and MSL Level 1 handling. It is explicitly intended for automotive power line and signal line protection, including body electronics, infotainment, and ADAS subsystems per Vishay's documentation.
What does the "HE3" suffix indicate in SMAJ45HE3/61?
The "HE3" suffix denotes high-reliability, automotive-grade construction: "H" signifies AEC-Q101 qualification and enhanced process controls; "E3" indicates RoHS-compliant, matte tin-plated leads meeting JESD201 Class 2 whisker resistance. This distinguishes SMAJ45HE3/61 from commercial-grade "E3" variants like SMAJ45E3/61.
How does SMAJ45HE3/61 differ from SMAJ45AHE3/61?
SMAJ45HE3/61 has a breakdown voltage range of 50.0–61.1 V and clamps at 80.3 V, whereas SMAJ45AHE3/61 has a tighter VBR range (50.0–55.3 V) and lower clamping voltage (72.7 V). Both share identical packaging, AEC-Q101 qualification, and thermal specs - the "A" variant prioritizes lower clamping for systems with minimal VWM margin.
What is the peak pulse power rating of SMAJ45HE3/61 and how is it applied?
SMAJ45HE3/61 is rated for 400 W peak pulse power with a 10/1000 µs waveform at TA = 25 °C, derating linearly above that temperature. This rating applies to single or repetitive surges at ≤0.01 % duty cycle and is validated using the standard test fixture with 0.2 × 0.2" copper pads - essential for designing compliant protection against ISO 7637-2 and IEC 61000-4-5 threats.
SMAJ45HE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45HE3/61 FAQ
1.How can I place an order for SMAJ45HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45HE3/61 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 SMAJ45HE3/61 reliable?
The price and inventory of SMAJ45HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45HE3/61?
SMAJ45HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45HE3/61 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 SMAJ45HE3/61?
For technical support, including SMAJ45HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45HE3/61 requirements.
6.How does Aetrix verify that SMAJ45HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45HE3/61 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 SMAJ45HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45HE3/61?
All SMAJ45HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45HE3/61, 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 SMAJ45HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ45HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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