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Vishay General Semiconductor - Diodes Division SMAJ43AHE3_A/H
- Part No.:
- SMAJ43AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHE3_A/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,544
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Product details
Overview
SMAJ43AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ43AHE3_A/H datasheet, SMAJ43AHE3_A/H pinout, SMAJ43AHE3_A/H application, or SMAJ43AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds VBR to divert transient energy away from downstream components. Its glass-passivated junction ensures stable leakage performance, while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
The device complies with ANSI/IEEE C62.35 surge standards and supports repetitive 0.01% duty cycle pulses. It is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits a +0.102 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - guaranteed breakdown window defining turn-on threshold tolerance |
| VC @ IPPM | 69.4 V at 5.8 A - clamped voltage during 10/1000 μs transient, limiting stress on protected ICs |
| PPPM | 400 W - peak transient power handling capability under standard waveform, derated above 78 V |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage ensuring minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments without thermal shutdown |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline compatible with JEDEC MS-013, MSL Level 1 |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on body; terminals solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 43 V rail); band-marked end conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without degradation when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during fast transients, reducing risk of latch-up in CMOS ICs |
| MSL Level 1 moisture sensitivity | Enables unlimited floor life and reflow compatibility up to 260 °C peak without baking |
| Glass passivated junction | Ensures long-term stability of leakage current and breakdown voltage under thermal cycling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive-going spikes. Use Value: Limits voltage to ≤69.4 V during 400 W surges, preventing damage to 50 V-rated DC-DC controllers and CAN transceivers. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Parallel-connected clamping device on 4–20 mA or 0–10 V signal lines exposed to ESD and inductive switching noise. Use Value: Sub-μA leakage preserves signal integrity; 69.4 V clamping prevents op-amp input stage breakdown during 8 kV contact ESD events. |
| Consumer Power Adapter Output Protection | Telecom DC Feeder Line Protection |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters delivering regulated 20 V output. IC Role / Device Role / Timing Role: Standoff-rated TVS on output rail to absorb flyback spikes from synchronous rectifier MOSFETs. Use Value: 43 V VWM allows margin above nominal 20 V output while clamping transients within safe limits for connected devices. | Use Scenario: DC power feed protection for remote radio units powered via 48 V PoE-like infrastructure. IC Role / Device Role / Timing Role: Unidirectional suppressor installed at equipment input to shunt lightning-induced surges on telecom feeder cables. Use Value: 400 W rating handles IEC 61643-21 Class II surge currents; AEC-Q101 qualification supports extended field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade, not AEC-Q101 qualified | Lacks automotive qualification; suitable for consumer/industrial but not under-hood automotive use | Select when AEC-Q101 is not required and cost optimization is prioritized |
| SMBJ43AHE3_A/H | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 20 % larger footprint, 10 % higher RθJA (130 °C/W) | Higher thermal resistance requires larger copper pads for equivalent power dissipation | Choose only if board layout accommodates larger SMB outline and thermal design permits |
Compared with SMAJ43A-E3/61 and SMBJ43AHE3_A/H, the SMAJ43AHE3_A/H uniquely combines AEC-Q101 qualification, SMA footprint efficiency, and 400 W surge capability - making it optimal for space-constrained automotive modules requiring validated reliability.
Availability
SMAJ43AHE3_A/H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface protection, and telecom DC feeder line protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ43AHE3_A/H 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 and application-specific validation.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ43AHE3_A/H at its rated peak pulse current?
The SMAJ43AHE3_A/H has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is measured with the device mounted on 0.2" × 0.2" copper pads per Vishay's recommended layout. The SMAJ43AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ43AHE3_A/H suitable for automotive applications?
Yes, SMAJ43AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use, as confirmed by its "HE3" suffix and documentation in Vishay's 88390 datasheet. It meets requirements for under-hood and chassis-mounted modules, including resistance to thermal cycling, mechanical shock, and humidity. The SMAJ43AHE3_A/H is commonly deployed in engine control units, body electronics, and ADAS power supplies where certified reliability is mandatory.
What does the "_A/H" suffix indicate in SMAJ43AHE3_A/H?
The "_A/H" suffix in SMAJ43AHE3_A/H denotes the revision code and packaging format: "A" is the revision identifier per Vishay's ordering nomenclature, and "H" specifies the preferred package code for 7-inch diameter plastic tape and reel, containing 1800 units. This matches the ordering information table in Document Number 88390 and confirms the part is supplied in standard SMT-compatible carrier format.
How does SMAJ43AHE3_A/H differ from bidirectional SMAJ43CA variants?
The SMAJ43AHE3_A/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction is not required. In contrast, SMAJ43CA devices are bidirectional, offering symmetrical clamping in both polarities - suited for AC signal lines or floating buses. The SMAJ43AHE3_A/H has lower leakage (<1.0 μA at 43 V) than bidirectional versions and cannot replace SMAJ43CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of SMAJ43AHE3_A/H, and how does it affect PCB layout?
The SMAJ43AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. These values assume mounting on minimum recommended 0.2" × 0.2" copper pads per terminal. To sustain 400 W peak pulses without exceeding 150 °C junction temperature, designers must ensure adequate copper area and avoid excessive trace length - underscoring why the SMAJ43AHE3_A/H datasheet specifies pad dimensions and thermal derating curves.
SMAJ43AHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43AHE3_A/H FAQ
1.How can I place an order for SMAJ43AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHE3_A/H 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 SMAJ43AHE3_A/H reliable?
The price and inventory of SMAJ43AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ43AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHE3_A/H?
SMAJ43AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHE3_A/H 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 SMAJ43AHE3_A/H?
For technical support, including SMAJ43AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ43AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHE3_A/H 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 SMAJ43AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ43AHE3_A/H?
All SMAJ43AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHE3_A/H, 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 SMAJ43AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ43AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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