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Vishay General Semiconductor - Diodes Division SMAJ43A-E3/5A
- Part No.:
- SMAJ43A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A-E3/5A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,874
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Product details
Overview
SMAJ43A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ43A-E3/5A datasheet, SMAJ43A-E3/5A pinout, SMAJ43A-E3/5A application, or SMAJ43A-E3/5A equivalent, key selection criteria include clamping performance under 5.8 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and suitability for automotive-grade designs when ordered with HE3 suffix.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 43 V), but clamps within picoseconds when transient voltage exceeds VBR, diverting surge current away from downstream ICs, MOSFETs, or sensor signal lines. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), mounted on 5.0 mm × 5.0 mm copper pads per terminal. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement with cathode band polarity identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction |
| VC @ IPPM | 69.4 V at 5.8 A - Clamped voltage seen by protected circuit during full-rated 400 W surge; limits stress on downstream components |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing |
| IFSM | 40 A (8.3 ms half-sine) - Surge current handling for single-event overvoltage events such as motor commutation spikes |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or industrial environments |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard PCB layout; informs heatsinking requirements for sustained surge duty |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line in unidirectional configuration | When used for DC line protection (e.g., 43 V supply rail), anode ties to ground or lower-potential node |
| Cathode | Current exit point in forward bias; marked with band; reverse-biased during normal operation | Connected to the line being protected (e.g., 43 V rail); conducts only during overvoltage events to clamp to VC |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surges without derating in standard PCB layouts |
| 69.4 V clamping voltage at 5.8 A | Limits voltage overshoot across protected ICs or MOSFETs during worst-case transients |
| Glass passivated chip junction | Ensures long-term stability of VBR and low leakage (<1 μA at 43 V) over temperature and lifetime |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility without dry-pack or baking requirements |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance mandates without halogen restrictions; suitable for consumer and industrial applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 42 V battery-fed control modules (e.g., body ECUs, lighting drivers) from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 42 V rail and chassis ground to clamp surges exceeding 69.4 V. Use Value: Prevents latch-up or gate oxide damage in downstream PMICs and microcontrollers during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops, 0–10 V sensors) in PLC I/O modules exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS placed differential-mode across signal and return, referenced to local ground. Use Value: Maintains signal integrity with <10 pF junction capacitance while limiting transient-induced offset errors to <1 LSB in 16-bit ADC systems. |
| Consumer USB Power Delivery Protection | Telecom DC Feeder Line Protection |
Use Scenario: Guarding USB-C PD controller VBUS input (nominal 20 V, up to 48 V) against hot-plug transients and cable ESD. IC Role / Device Role / Timing Role: Unidirectional TVS from VBUS to GND, sized to handle 400 W surges without thermal runaway. Use Value: Survives repeated ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 μs surges up to 5.8 A while maintaining <1 μA leakage at 20 V. | Use Scenario: Protecting -48 V DC telecom feeder lines in remote radio units and base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Series-connected unidirectional TVS on each conductor, referenced to common ground, rated for continuous -48 V operation. Use Value: Withstands 43 V standoff and clamps to ≤69.4 V, preserving integrity of upstream DC-DC converters and monitoring ICs during Telcordia GR-1089 Class B 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 |
|---|---|---|---|
| SMAJ43A-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and package | No functional difference; selected where halogen-free materials are mandated (e.g., EU public infrastructure projects) | Choose M3/5A if halogen-free compliance is required; otherwise E3/5A offers standard commercial-grade sourcing |
| SMAJ43AHE3_A/I | AEC-Q101 qualified; same VWM, VBR, VC, PPPM; enhanced reliability screening and traceability | Required for automotive powertrain and chassis applications; not certified for use in safety-critical systems without additional validation | Select HE3_A/I for automotive OEM programs needing AEC-Q101 evidence; E3/5A suffices for non-automotive industrial use |
Compared with SMAJ43A-M3/5A, the SMAJ43A-E3/5A provides identical surge protection performance with standard RoHS compliance, while SMAJ43AHE3_A/I adds automotive qualification at higher cost and longer lead time-making E3/5A optimal for cost-sensitive industrial and consumer designs requiring no AEC certification.
Availability
SMAJ43A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface circuits, consumer USB-C PD input stages, and telecom DC feeder line protection requiring stable component supply and consistent surge performance across production batches.
Supply support for SMAJ43A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where fast response, repeatable clamping, and long-term stability under thermal cycling are critical.
FAQ
What is the maximum clamping voltage of the SMAJ43A-E3/5A under full-rated surge current?
The SMAJ43A-E3/5A exhibits a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 5.8 A using a 10/1000 μs waveform. This value is measured per JEDEC standards and represents the upper limit of voltage imposed on the protected circuit during worst-case transient events. The SMAJ43A-E3/5A maintains this clamping performance across its specified operating temperature range of -55 °C to +150 °C.
Is the SMAJ43A-E3/5A suitable for automotive applications?
The SMAJ43A-E3/5A is RoHS-compliant and qualified for commercial-grade use but is not AEC-Q101 certified. For automotive applications requiring qualification, Vishay offers the SMAJ43AHE3_A/I variant. The SMAJ43A-E3/5A may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) provided system-level validation confirms robustness-however, the SMAJ43A-E3/5A itself carries no automotive qualification documentation.
What is the polarity configuration and marking convention for the SMAJ43A-E3/5A?
The SMAJ43A-E3/5A is a unidirectional TVS diode with cathode indicated by a visible black band on the SMA (DO-214AC) package body. During normal operation, the cathode connects to the line being protected (e.g., 43 V rail), and the anode connects to ground. This configuration ensures reverse-biased operation under steady-state conditions and rapid forward conduction during overvoltage events to clamp to 69.4 V. The SMAJ43A-E3/5A does not support bidirectional operation.
How does the thermal performance of the SMAJ43A-E3/5A affect PCB layout?
The SMAJ43A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. To maintain junction temperature below 150 °C during repetitive surges, designers must ensure adequate copper area and avoid thermal isolation. Reducing pad size or adding thermal vias improves RθJA, but the SMAJ43A-E3/5A's rating assumes baseline layout per Vishay's datasheet Figure 6.
What packaging option does the "/5A" suffix indicate for the SMAJ43A-E3/5A?
The "/5A" suffix in SMAJ43A-E3/5A denotes a 13-inch diameter plastic tape-and-reel packaging format containing 7500 units per reel, optimized for high-volume SMT assembly. This contrasts with the "/61" suffix (7-inch reel, 1800 units). Both share identical electrical and mechanical specifications; the /5A variant supports extended production runs with fewer reel changes and reduced handling overhead in automated pick-and-place operations.
SMAJ43A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMAJ43A-E3/5A FAQ
1.How can I place an order for SMAJ43A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A-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 SMAJ43A-E3/5A reliable?
The price and inventory of SMAJ43A-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 SMAJ43A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A-E3/5A?
SMAJ43A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A-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 SMAJ43A-E3/5A?
For technical support, including SMAJ43A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A-E3/5A requirements.
6.How does Aetrix verify that SMAJ43A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43A-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 SMAJ43A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43A-E3/5A?
All SMAJ43A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A-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 SMAJ43A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ43A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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