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Vishay General Semiconductor - Diodes Division SMAJ43CHE3/5A
- Part No.:
- SMAJ43CHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CHE3/5A.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,782
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Product details
Overview
SMAJ43CHE3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection of signal and power lines. It features a 43 V stand-off voltage (VWM), 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 - suitable for automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ43CHE3/5A datasheet, SMAJ43CHE3/5A pinout, SMAJ43CHE3/5A application, or SMAJ43CHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, bi-directional symmetry, low leakage (<1 µA at 43 V), RoHS-compliant high-reliability HE3 suffix, and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This bi-directional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 47.8 V and 58.4 V at 1 mA test current. Its clamping behavior limits transient-induced voltage excursions to ≤76.7 V under 5.2 A 10/1000 µs surge, enabling reliable protection of downstream ICs without forward conduction concerns.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020, with matte tin-plated leads qualified to JESD201 Class 2 whisker resistance and solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 43 V - Maximum continuous reverse operating voltage before significant leakage begins |
| Clamping Voltage (VC) | 76.7 V at 5.2 A - Peak voltage seen by protected circuit during 10/1000 µs transient |
| Peak Pulse Power (PPPM) | 400 W - Surge energy handling capability under standardized 10/1000 µs waveform |
| Breakdown Voltage (VBR) | 47.8–58.4 V at 1 mA - Confirmed bi-directional avalanche threshold range |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.2" × 0.2" thermal pad requirement for rated power dissipation |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two unmarked terminals; bi-directional construction means no polarity marking - both terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bi-directional avalanche junction - conducts surge current equally in either direction when V > VBR |
| Case (plastic body) | Thermal and mechanical interface | No electrical connection; requires 0.2" × 0.2" copper pad per terminal for full 400 W rating |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Bi-directional symmetry | Identical VBR, VC, and leakage performance in both polarities - simplifies layout and eliminates polarity checks |
| Low clamping ratio (VC/VWM ≈ 1.78) | Minimizes overvoltage stress on protected ICs while maintaining margin above system operating voltage |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - no baking required prior to reflow |
| RoHS-compliant HE3 suffix | High-reliability variant with JESD201 Class 2 whisker resistance and extended lifetime testing |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN transceiver inputs and analog sensor lines (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Withstands 400 W surges while clamping to 76.7 V - sufficient margin above 42 V automotive supply rails and compatible with 5 V/12 V sensor front-ends. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage suppression element across differential input terminals, operating in parallel with input RC filters. Use Value: Low 1 µA leakage at 43 V ensures minimal impact on precision measurement accuracy; DO-214AC footprint supports high-density I/O module layouts. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers from ESD and lightning-induced surges in outdoor telecom equipment. IC Role / Device Role / Timing Role: First-line transient suppressor on line-side traces, coordinated with GDT or polymer PTC upstream. Use Value: 76.7 V clamping voltage aligns with IEC 61000-4-5 Level 4 (4 kV) requirements for secondary circuits; bi-directional nature matches balanced signaling standards. |
Use Scenario: Suppressing commutation spikes from brushed DC motors and relay coils in smart home appliances (e.g., washing machines, HVAC actuators). IC Role / Device Role / Timing Role: Snubber-style clamp across motor terminals or relay coil to limit inductive kickback to safe levels for MCU GPIOs and driver ICs. Use Value: 400 W rating handles repetitive switching events; 150 °C max junction temperature accommodates enclosed thermal environments typical in appliance enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3/5A | Unidirectional variant - cathode-marked, asymmetric conduction; VC = 69.4 V at 5.8 A | Requires polarity-aware placement; preferred where DC bias exists and reverse conduction must be blocked | Select only if system has defined polarity and needs lower clamping voltage under forward surge |
| SMCJ43CAHE3/5A | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VC specs | Used where higher single-event energy (e.g., ISO 16750-2 pulse 5a) must be absorbed without derating | Choose when board space allows larger footprint and surge threat level exceeds 400 W capability |
Compared with SMAJ43CHE3/5A, the unidirectional SMAJ43AHE3/5A offers tighter clamping but demands correct orientation, while the SMCJ43CAHE3/5A delivers triple the pulse power in a larger package - making SMAJ43CHE3/5A optimal for space-constrained, polarity-agnostic 400 W protection tasks.
Availability
SMAJ43CHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line card protection requiring stable component supply with AEC-Q101 traceability and long-term production continuity.
Supply support for SMAJ43CHE3/5A 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 and automotive qualification.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments, targeting AEC-Q101 compliance and high-volume automated manufacturing for automotive and industrial end equipment.
FAQ
What does the 'HE3' suffix indicate in SMAJ43CHE3/5A?
The HE3 suffix in SMAJ43CHE3/5A denotes Vishay's high-reliability, automotive-grade variant: RoHS-compliant with JESD201 Class 2 whisker resistance, AEC-Q101 qualification, and enhanced lifetime testing. It is distinct from commercial-grade E3 parts and required for automotive applications where long-term stability under thermal cycling and vibration is critical. SMAJ43CHE3/5A meets these stringent requirements.
Is SMAJ43CHE3/5A unidirectional or bidirectional?
SMAJ43CHE3/5A is a bi-directional transient voltage suppressor, meaning it provides symmetrical clamping in both polarities - no cathode band marking, and identical electrical characteristics (VBR, VC, IPPM) regardless of voltage polarity applied. This makes SMAJ43CHE3/5A ideal for protecting AC-coupled or differential signal lines where polarity is undefined or alternating.
What is the maximum clamping voltage for SMAJ43CHE3/5A under surge conditions?
The maximum clamping voltage (VC) for SMAJ43CHE3/5A is 76.7 V, measured at a peak pulse current (IPPM) of 5.2 A using the standardized 10/1000 µs waveform. This value is guaranteed per Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - a key parameter for ensuring downstream ICs remain within absolute maximum ratings. SMAJ43CHE3/5A maintains this clamping performance across its full operating temperature range.
Can SMAJ43CHE3/5A replace SMAJ43AHE3/5A in a design?
No - SMAJ43CHE3/5A cannot directly replace SMAJ43AHE3/5A without layout and functional review. SMAJ43AHE3/5A is unidirectional (cathode-marked, blocks reverse current), while SMAJ43CHE3/5A is bi-directional (no marking, conducts in both directions). Substituting SMAJ43CHE3/5A may cause unintended conduction in DC-biased circuits. SMAJ43CHE3/5A is only suitable where polarity independence is required or verified.
What PCB pad layout is required to achieve the full 400 W rating for SMAJ43CHE3/5A?
To achieve the full 400 W peak pulse power rating, SMAJ43CHE3/5A must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay Document 88390. Smaller pads will thermally derate the device - e.g., at 75 °C ambient, power capability drops significantly below 400 W. The DO-214AC package's thermal resistance (RθJA = 120 °C/W) assumes this pad area; SMAJ43CHE3/5A performance depends critically on adherence to this layout.
SMAJ43CHE3/5A 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:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43CHE3/5A FAQ
1.How can I place an order for SMAJ43CHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CHE3/5A 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 SMAJ43CHE3/5A reliable?
The price and inventory of SMAJ43CHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43CHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CHE3/5A?
SMAJ43CHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CHE3/5A 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 SMAJ43CHE3/5A?
For technical support, including SMAJ43CHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CHE3/5A requirements.
6.How does Aetrix verify that SMAJ43CHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43CHE3/5A 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 SMAJ43CHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43CHE3/5A?
All SMAJ43CHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CHE3/5A, 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 SMAJ43CHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ43CHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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