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Vishay General Semiconductor - Diodes Division SMAJ43-E3/5A
- Part No.:
- SMAJ43-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43-E3/5A.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,673
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Product details
Overview
SMAJ43-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V stand-off voltage (VWM), 47.8–58.4 V breakdown voltage (VBR), 76.7 V maximum clamping voltage (VC) at 5.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in industrial and automotive systems.
For engineers reviewing the SMAJ43-E3/5A datasheet, SMAJ43-E3/5A pinout, SMAJ43-E3/5A application, or SMAJ43-E3/5A equivalent, this page delivers verified electrical parameters, thermal resistance values (RθJA = 120 °C/W), JEDEC-compliant MSL level 1 handling, RoHS-compliant matte tin plating, and precise clamping behavior under standardized surge conditions - all critical for layout-aware transient protection design and BOM validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 43 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at VWM), while the DO-214AC package supports automated placement and withstands solder reflow up to 260 °C.
It delivers 400 W peak pulse power (derated to 300 W above 78 V), handles 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range. Clamping occurs within picoseconds, with low incremental surge resistance enabling effective suppression of fast-rising transients induced by inductive load switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines circuit's normal operating margin. |
| VBR (min/max) | 47.8 V / 58.4 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 76.7 V at 5.2 A - Measured clamping voltage during 10/1000 µs surge; determines maximum stress on protected device. |
| PPPM | 400 W - Peak pulse power dissipation capability; defines energy-handling capacity for transient events. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); validates robustness against power-line surges. |
| TJ Range | –55 °C to +150 °C - Validated junction temperature operating window; supports under-hood and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration. Cathode indicated by molded band on case body. Matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes shunt path during transient conduction. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., power rail or signal trace); receives surge energy prior to clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress. |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
| RoHS-compliant matte tin plating | Guarantees solder joint integrity and whisker resistance (JESD201 Class 1A) for high-reliability assemblies. |
| 400 W 10/1000 µs pulse rating | Validated energy absorption capacity for common lightning and inductive-switching transients per IEC 61000-4-5. |
| Low clamping ratio (VC/VWM ≈ 1.78) | Minimizes overvoltage exposure to downstream components - critical for 3.3 V/5 V logic and MOSFET gate protection. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs and body control modules from load-dump and alternator ripple transients. IC Role / Device Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Withstands 40 A surge current and clamps to ≤76.7 V, preventing damage to 40 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O of pressure/temperature sensors in factory automation. IC Role / Device Role: Low-capacitance TVS mounted directly at connector interface to suppress ESD and cable-coupled noise. Use Value: Sub-1 µA leakage at 43 V preserves signal accuracy; fast response limits transient propagation into precision ADC front-ends. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD devices and smart home hubs. IC Role / Device Role: Standoff-rated TVS on 5–20 V output rails to absorb flyback transformer ringing and hot-plug transients. Use Value: 76.7 V clamping ensures downstream USB-PD controllers (rated to 28 V) remain within absolute maximum ratings during fault events. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras, wireless APs) from surges entering via 48 V DC feed lines. IC Role / Device Role: Primary-stage TVS on midspan injector output to meet IEC 61000-4-5 Level 3 (2 kV/1 kA) requirements. Use Value: 400 W pulse rating and 120 °C/W RθJA enable sustained surge handling without thermal runaway on compact PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/5A | Lower VBR range (47.8–52.8 V), tighter tolerance; clamps at 69.4 V @ 5.8 A. | Better suited for circuits requiring lower clamping voltage near 43 V nominal rails. | Select SMAJ43A-E3/5A when tighter VBR tolerance and reduced VC are prioritized over higher surge margin. |
| SMBJ43A-E3/52 | DO-214AA (SMB) package; same VWM/VBR, but 600 W PPPM and higher IPPM (8.1 A). | Higher power handling enables use in more severe surge environments (e.g., outdoor telecom). | Choose SMBJ43A-E3/52 only if board space allows larger SMB footprint and 600 W rating is required. |
Compared with SMAJ43-E3/5A, the SMAJ43A-E3/5A offers improved clamping consistency at lower cost for tightly regulated 43 V systems, while the SMBJ43A-E3/52 trades smaller size for significantly higher surge capacity - making SMAJ43-E3/5A the optimal balance of compactness, proven 400 W performance, and broad compatibility in space-constrained industrial and automotive designs.
Availability
SMAJ43-E3/5A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and consumer power adapter surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ43-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 high-reliability diodes, rectifiers, and protection devices engineered for demanding industrial, automotive, and computing applications.
The SMAJ series was developed specifically for surface-mount transient suppression in space-constrained, high-volume electronics - emphasizing consistent clamping, JEDEC-compliant manufacturability, and AEC-Q101 readiness for automotive-grade variants.
FAQ
What is the maximum clamping voltage of SMAJ43-E3/5A under standard test conditions?
The SMAJ43-E3/5A exhibits a maximum clamping voltage (VC) of 76.7 V when subjected to its rated peak pulse current of 5.2 A using the 10/1000 µs waveform. This value is measured per Figure 1 and Table 2 of Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ43-E3/5A suitable for automotive applications?
SMAJ43-E3/5A is RoHS-compliant and qualified to MSL Level 1, but it is not AEC-Q101 certified. For automotive applications requiring qualification, the HE3-suffix variant (e.g., SMAJ43HE3/5A) must be used. The SMAJ43-E3/5A remains appropriate for non-safety-critical, commercial-grade automotive subsystems where full AEC-Q101 compliance is not mandated.
What does the "E3/5A" suffix indicate in SMAJ43-E3/5A?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with JESD201 Class 1A whisker resistance. The "5A" refers to the packaging format: 13-inch diameter plastic tape and reel containing 7500 units - optimized for high-speed pick-and-place assembly. This differs from "61" packaging (7-inch reel, 1800 units) used in lower-volume prototyping.
How does SMAJ43-E3/5A differ from SMAJ43A-E3/5A?
SMAJ43-E3/5A has a VBR range of 47.8–58.4 V and clamps at 76.7 V, whereas SMAJ43A-E3/5A has a tighter VBR range of 47.8–52.8 V and clamps at 69.4 V. The "A" suffix indicates an enhanced breakdown voltage tolerance, resulting in lower and more predictable clamping - advantageous for precision 43 V rail protection where overshoot margin is minimal.
What is the thermal resistance of SMAJ43-E3/5A, and how does it affect PCB layout?
SMAJ43-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Figure 5; reducing pad area increases thermal impedance and risks junction overheating during repetitive surges - so maintaining specified copper land patterns is essential for sustained 400 W pulse handling.
SMAJ43-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ43-E3/5A FAQ
1.How can I place an order for SMAJ43-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43-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 SMAJ43-E3/5A reliable?
The price and inventory of SMAJ43-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 SMAJ43-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43-E3/5A?
SMAJ43-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43-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 SMAJ43-E3/5A?
For technical support, including SMAJ43-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43-E3/5A requirements.
6.How does Aetrix verify that SMAJ43-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43-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 SMAJ43-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43-E3/5A?
All SMAJ43-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43-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 SMAJ43-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ43-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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