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Vishay General Semiconductor - Diodes Division SMAJ45-E3/5A
- Part No.:
- SMAJ45-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45-E3/5A.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,161
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Product details
Overview
SMAJ45-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–61.1 V breakdown voltage (VBR at 1 mA), 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 power supplies.
For engineers reviewing the SMAJ45-E3/5A datasheet, SMAJ45-E3/5A pinout, SMAJ45-E3/5A application, or SMAJ45-E3/5A equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC terminal mapping, RoHS-compliant commercial-grade construction, and direct alternative options for overvoltage protection design-in.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 45 V), then rapidly avalanches below 61.1 V to limit transient energy. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, enabling sub-nanosecond response to ESD and lightning-induced surges.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = +150 °C, supporting operation in automotive and industrial ambient environments. The device meets MSL Level 1 per J-STD-020 and is rated for solder reflow up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 48 V DC systems. |
| VBR (min/max) | 50.0 V / 61.1 V at 1 mA - Confirmed breakdown range ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 80.3 V at 5.0 A - Clamping voltage during 10/1000 µs surge; limits downstream stress to <81 V under 400 W transient. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 µs waveform; derates above 78 V to 300 W. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current robustness. |
| TJ Range | −55 °C to +150 °C - Full industrial temperature operation without derating; validated for under-hood automotive use. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, RoHS-compliant commercial grade (E3 suffix), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to system ground or low-voltage rail; forms shunt path during overvoltage events. |
| Cathode (banded end) | Reverse-biased terminal / clamping node | Connected to protected line (e.g., 48 V supply rail); avalanche conduction occurs here when VIN > VBR. |
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) | Handles IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) on 48 V lines without failure when properly mounted. |
| Low clamping ratio (VC/VBR(min) = 1.61) | Minimizes overvoltage overshoot during fast transients, reducing stress on downstream MOSFET gate oxides and logic inputs. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking; compatible with high-volume automated placement. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 48 V input rails of DC-DC converters against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt clamping device placed between input rail and ground; responds within <1 ns to suppress spikes exceeding 61.1 V. Use Value: Limits voltage seen by primary-side controller ICs (e.g., LM5116) to ≤80.3 V, preventing latch-up or permanent damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from ESD and battery reversal-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-LIN line; clamps negative transients and positive overvoltages. Use Value: Maintains signal integrity below 80.3 V while adding <1 pF capacitance, avoiding data corruption in 20 kbps LIN communication. |
| Telecom Remote Radio Unit (RRU) | Consumer Smart Home Hub Power Input |
Use Scenario: Shielding 48 V phantom power inputs of RF front-end modules from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC feed line; coordinated with upstream MOVs and downstream π-filters. Use Value: Withstands repetitive 400 W surges per IEC 61000-4-5, enabling compliance with EN 61000-4-5 Class 3 (2 kV line-earth) without derating. |
Use Scenario: Securing USB-C PD input stage of smart home hubs against plug-in surges and hot-swap transients. IC Role / Device Role / Timing Role: First-line transient suppressor on VBUS rail prior to buck converter; placed adjacent to connector per layout best practices. Use Value: Delivers 5.0 A IPPM clamping at 80.3 V with <100 ps response, limiting stress on USB PD controller (e.g., FUSB302) during 1 kV contact ESD events. |
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-E3/5A | Narrower VBR range (50.0–55.3 V); lower VC = 72.7 V at 5.5 A; tighter tolerance improves clamping consistency. | Better suited for precision 45 V systems where <73 V clamping is mandatory (e.g., FPGA I/O protection). | Select SMAJ45A-E3/5A when VC margin is critical and peak surge current remains ≤5.5 A. |
| SMBJ45A-E3/52 | DO-214AA (SMB) package; same VWM/VBR; higher PPPM = 600 W; larger footprint (0.208" × 0.157") vs. SMA (0.208" × 0.126"). | Used where higher surge endurance is required (e.g., outdoor PoE injectors), but requires PCB layout change. | Choose SMBJ45A-E3/52 only if 600 W rating is needed and board space allows larger SMB package. |
Compared with SMAJ45-E3/5A, the SMAJ45A-E3/5A offers tighter clamping control at the cost of reduced surge current headroom, while the SMBJ45A-E3/52 trades compactness for higher power handling - neither is pin-compatible due to differing package outlines and thermal pad requirements.
Availability
SMAJ45-E3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote radio units, and consumer smart home hubs requiring stable component supply with full traceability and volume scalability.
Supply support for SMAJ45-E3/5A 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 reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where consistent clamping performance and AEC-Q101 readiness (in HE3 variants) are essential.
FAQ
What is the maximum clamping voltage of SMAJ45-E3/5A under a 10/1000 µs surge?
The SMAJ45-E3/5A has a maximum clamping voltage (VC) of 80.3 V when subjected to its rated peak pulse current of 5.0 A with a 10/1000 µs waveform. 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 standardized surge events. The SMAJ45-E3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ45-E3/5A suitable for automotive applications?
SMAJ45-E3/5A is the commercial-grade variant (E3 suffix) and is not AEC-Q101 qualified. For automotive use, Vishay specifies the HE3-suffixed version (e.g., SMAJ45HE3/5A). While the SMAJ45-E3/5A shares identical electrical characteristics and DO-214AC packaging, only the HE3 variant undergoes extended reliability testing per AEC-Q101. The SMAJ45-E3/5A remains appropriate for non-safety-critical industrial or telecom applications.
What is the standoff voltage and why does it matter for SMAJ45-E3/5A?
The standoff voltage (VWM) of SMAJ45-E3/5A is 45 V - the maximum DC or continuous reverse voltage the device can block without significant leakage (<1 µA). This parameter ensures the SMAJ45-E3/5A remains non-conductive during normal operation of a 48 V nominal system, avoiding power loss or false triggering. Exceeding VWM risks premature conduction and thermal runaway, so proper margin (e.g., ≥10 % above nominal rail) is critical in layout.
How does the DO-214AC package of SMAJ45-E3/5A affect thermal performance?
The DO-214AC (SMA) package of SMAJ45-E3/5A delivers RθJA = 120 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. This thermal resistance determines junction temperature rise under surge conditions: at 400 W peak power, ΔT ≈ 48 °C above ambient. To sustain repeated surges, designers must ensure adequate copper area and avoid thermal bottlenecks - the SMAJ45-E3/5A's RθJL = 30 °C/W further emphasizes the need for short, wide traces to ground planes.
Can SMAJ45-E3/5A be used in bidirectional configurations?
No - SMAJ45-E3/5A is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMAJ45CA), which lacks polarity marking and exhibits symmetric clamping in both directions. Using SMAJ45-E3/5A in reverse-biased AC signal paths would result in forward conduction and failure. Always match device polarity to circuit topology: SMAJ45-E3/5A for DC rail-to-ground protection only.
SMAJ45-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ45-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ45-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45-E3/5A?
SMAJ45-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45-E3/5A 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-E3/5A?
For technical support, including SMAJ45-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45-E3/5A requirements.
6.How does Aetrix verify that SMAJ45-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45-E3/5A?
All SMAJ45-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ45-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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