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Vishay General Semiconductor - Diodes Division SMAJ45-E3/61
- Part No.:
- SMAJ45-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45-E3/61.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
SMAJ45-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–61.1 V breakdown voltage (VBR), 80.3 V maximum clamping voltage (VC) at 5.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ45-E3/61 datasheet, SMAJ45-E3/61 pinout, SMAJ45-E3/61 application, or SMAJ45-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC mechanical data, clamping performance under standardized surge conditions, RoHS-compliant commercial-grade construction, and real-world protection use cases for sensitive 45 V rail systems.
Technical Context
The SMAJ45-E3/61 employs a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its unidirectional polarity uses a cathode band marking and supports DC-biased circuits where reverse leakage must remain ≤1.0 µA at 45 V standoff.
Thermal design relies on low junction-to-lead resistance (RθJL = 30 °C/W) and standard 0.2 × 0.2" copper pads for 400 W pulse dissipation. It meets MSL Level 1 per J-STD-020 and withstands solder reflow up to 260 °C for 40 s, confirming suitability for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias limit for protected line. |
| VBR @ IT = 1 mA | 50.0–61.1 V - Breakdown threshold range; ensures reliable conduction onset during overvoltage events above nominal rail. |
| VC @ IPPM = 5.0 A | 80.3 V - Clamped voltage under 10/1000 µs surge; limits downstream device stress to ≤80.3 V during 400 W transient. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; enables robust protection against IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports single-event inrush or load-dump immunity. |
| Junction Temp Range | −55 °C to +150 °C - Operational and storage temperature envelope; validated for under-hood automotive and industrial environments. |
| Leakage @ VWM | ≤1.0 µA - Ultra-low reverse leakage at rated standoff; prevents excessive quiescent current in battery-powered systems. |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, gull-wing leaded outline per JEDEC DO-214AC; cathode indicated by molded band; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-impedance path during clamping | Connected to protected line's lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line's higher-potential side (e.g., 45 V supply rail); band-marked end defines polarity orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| 400 W peak pulse power (10/1000 µs) | Provides certified surge immunity per IEC 61000-4-5 without derating below 78 V - critical for 45 V system-level protection. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to reflow; supports direct placement into high-volume SMT lines without dry-pack handling. |
| RoHS-compliant commercial grade (E3 suffix) | Meets EU Directive 2002/95/EC; JESD201 Class 1A whisker resistance ensures interconnect integrity in vibration-prone applications. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping precision for sensitive 45 V logic and analog circuits. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 45 V auxiliary power rails in vehicle body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 45 V supply and chassis ground to clamp surges exceeding 80.3 V. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤80.3 V during 400 W transients, preventing latch-up or gate oxide damage. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted across sensor output and reference ground to suppress EFT bursts and inductive switching noise. Use Value: Maintains signal integrity by clamping transients within 1 ns, keeping leakage <1.0 µA at 45 V to avoid offset drift in 16-bit ADC front-ends. |
| Telecom DC Power Input Stage | Consumer Device USB Power Switching |
|
Use Scenario: Safeguarding 48 V PoE+ midspan injectors against lightning-induced surges on Ethernet cable pairs. IC Role / Device Role / Timing Role: Unidirectional SMAJ45-E3/61 installed on primary-side DC input before isolation transformer. Use Value: Withstands repetitive 10/1000 µs surges up to 400 W while maintaining VC ≤80.3 V, ensuring compliance with IEEE 802.3at surge immunity requirements. |
Use Scenario: Overvoltage protection for USB-C PD 3.0 45 W (9 V × 5 A) power delivery paths in portable docking stations. IC Role / Device Role / Timing Role: TVS placed on VBUS line to absorb hot-swap and adapter fault transients before buck converter input. Use Value: Fast clamping action limits VBUS overshoot to 80.3 V during 5.0 A surge events, preventing damage to USB PD controller and port protection FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61 | Lower VBR range (50.0–55.3 V) and reduced VC (72.7 V at 5.5 A); same 45 V VWM and 400 W rating. | Better suited for tighter clamping margin applications where 72.7 V max clamping is required instead of 80.3 V. | Select SMAJ45A-E3/61 when downstream devices have lower absolute maximum voltage ratings and require tighter clamping. |
| SMBJ45-E3/52 | Same VWM (45 V) and VBR range but in larger DO-214AA (SMB) package; higher thermal mass (RθJA = 80 °C/W vs. 120 °C/W). | Preferred for higher ambient temperature environments or where board space allows larger footprint for improved thermal margin. | Choose SMBJ45-E3/52 when sustained surge duty cycle or elevated ambient temperatures demand lower junction temperature rise. |
Compared with SMAJ45-E3/61, SMAJ45A-E3/61 offers lower clamping voltage at the cost of slightly reduced breakdown consistency, while SMBJ45-E3/52 trades smaller PCB area for superior thermal performance - enabling selection based on layout constraints, clamping precision, or thermal environment.
Availability
SMAJ45-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor guarding, telecom DC input stages, and consumer USB-C PD applications requiring stable component supply, full traceability, and RoHS-compliant commercial-grade TVS performance.
Supply support for SMAJ45-E3/61 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 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 engineered for high-energy transient suppression in compact surface-mount formats, targeting automotive, industrial, and telecom systems where fast response, low leakage, and JEDEC-standard packaging are essential.
FAQ
What is the maximum clamping voltage of SMAJ45-E3/61 under standard test conditions?
The SMAJ45-E3/61 has a maximum clamping voltage (VC) of 80.3 V when subjected to a 10/1000 µs surge waveform at 5.0 A peak pulse current. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ45-E3/61 maintains this clamping performance consistently across its qualified temperature range.
Is SMAJ45-E3/61 suitable for automotive applications?
SMAJ45-E3/61 is rated for operation from −55 °C to +150 °C and meets MSL Level 1 per J-STD-020, making it suitable for under-hood and cabin automotive subsystems. However, it carries the commercial-grade E3 suffix - not the AEC-Q101-qualified HE3 suffix. For AEC-Q101-compliant designs, specify SMAJ45HE3/61 instead of SMAJ45-E3/61.
What does the "E3/61" suffix indicate in SMAJ45-E3/61?
The "E3" denotes RoHS-compliant, commercial-grade construction meeting JESD201 Class 1A whisker resistance, while "/61" specifies packaging in 7-inch plastic tape-and-reel format with 1800 units per reel. This ordering code confirms full compliance with JEDEC DO-214AC mechanical standards and IPC/JEDEC reflow profile compatibility for SMAJ45-E3/61.
How does SMAJ45-E3/61 differ from SMAJ45A-E3/61?
SMAJ45-E3/61 has a VBR range of 50.0–61.1 V and clamps at 80.3 V, whereas SMAJ45A-E3/61 features tighter VBR (50.0–55.3 V) and lower clamping voltage (72.7 V). Both share identical VWM (45 V), PPPM (400 W), and DO-214AC packaging. The "A" variant provides enhanced clamping precision for margin-critical designs using SMAJ45-E3/61.
Can SMAJ45-E3/61 be used in bidirectional configurations?
No - SMAJ45-E3/61 is a unidirectional TVS diode, identified by its cathode band marking. For bidirectional protection at 45 V standoff, use SMAJ45CA-E3/61 (or SMAJ45C-E3/61), which exhibits symmetrical clamping in both polarities and omits the polarity band. Using SMAJ45-E3/61 in reverse-biased AC applications risks permanent failure due to lack of reverse conduction capability.
SMAJ45-E3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45-E3/61 FAQ
1.How can I place an order for SMAJ45-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45-E3/61 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 SMAJ45-E3/61 reliable?
The price and inventory of SMAJ45-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45-E3/61?
SMAJ45-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45-E3/61 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 SMAJ45-E3/61?
For technical support, including SMAJ45-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45-E3/61 requirements.
6.How does Aetrix verify that SMAJ45-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45-E3/61 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 SMAJ45-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45-E3/61?
All SMAJ45-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45-E3/61, 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 SMAJ45-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ45-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45-E3/61 Tags
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