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Vishay General Semiconductor - Diodes Division BZX84C43-G3-18
- Part No.:
- BZX84C43-G3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C43-G3-18.pdf
- Description:
- DIODE ZENER 43V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,370
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Product details
Overview
BZX84C43-G3-18 from Vishay Semiconductors is a silicon planar Zener diode rated for 43 V nominal zener voltage (±5 % tolerance), 2 mA test current, 0.05 μA reverse leakage at 30.1 V, 150 Ω dynamic resistance at 2 mA, and 12 × 10⁻⁴/°C temperature coefficient - used for precision voltage reference and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the BZX84C43-G3-18 datasheet, BZX84C43-G3-18 pinout, BZX84C43-G3-18 application, or BZX84C43-G3-18 equivalent, this part supports stable voltage clamping in automotive body control modules, industrial I/O signal conditioning, and portable medical device power rails where ±5 % tolerance and MSL level 1 handling are required.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under controlled current conditions. Its 43 V nominal zener voltage is specified at 2 mA test current (IZT1), with dynamic resistance of 150 Ω measured at 1 kHz, enabling predictable regulation in feedback loops and threshold detection circuits.
The device exhibits a positive temperature coefficient of +12 × 10⁻⁴/°C, indicating increasing zener voltage with rising junction temperature - a critical factor when designing thermally stable references in wide-temperature environments such as under-hood automotive electronics or outdoor industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, ±5 % tolerance - defines precise clamping threshold for overvoltage protection and reference generation |
| Test Current (IZT1) | 2 mA - standard operating point for specifying VZ, dynamic resistance, and temperature coefficient |
| Reverse Leakage (IR) | 0.05 μA max at 30.1 V - ensures minimal standby current in high-impedance bias networks |
| Dynamic Resistance (ZZ) | 150 Ω at 2 mA, 1 kHz - determines regulation stiffness and output impedance in shunt regulator configurations |
| Temperature Coefficient (αVZ) | +12 × 10⁻⁴/°C - quantifies voltage drift per degree Celsius, critical for thermal stability in unregulated environments |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - sets maximum continuous power handling without heatsinking or forced airflow |
| Junction Temperature (Tj) | 150 °C max - defines upper thermal limit for reliable long-term operation in sealed enclosures |
Pinout & Package
SOT-23 surface-mount package (9.2 mg weight, UL 94 V-0 molding compound, MSL level 1 per J-STD-020) with standardized three-terminal configuration: anode, cathode, and internal connection to substrate (cathode marked by band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Current entry terminal in forward bias; connected to ground or lower potential in shunt regulation | Provides return path for zener current; must be routed with low-impedance trace in high-accuracy references |
| 2 (Cathode) | Current exit terminal in reverse breakdown; connected to supply rail or protected node | Carries full zener current during clamping; marking band identifies this pin for correct PCB orientation |
| 3 (Emitter / Substrate Tie) | Internal connection to SOT-23 leadframe substrate | Not electrically isolated; tied to cathode internally - no external connection required or recommended |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar construction | Ensures repeatable breakdown characteristics and long-term stability vs. alloyed or diffused junctions |
| E24-standard zener voltage grading | Guarantees compatibility with industry-standard resistor and capacitor value series for matched analog designs |
| ESD robustness (HBM > 8 kV, MM > 800 V) | Enables safe handling and assembly in non-ESD-controlled production lines without additional protection |
| AEC-Q101 qualification available | Supports automotive-grade reliability requirements including temperature cycling, humidity testing, and mechanical shock |
| Green-compliant packaging (G3 suffix) | Meets RoHS Directive 2011/65/EU and halogen-free material requirements for environmental compliance |
Applications
| Automotive Body Control Unit (BCU) | Industrial Analog Input Module |
|---|---|
Use Scenario: Clamping 12 V battery-supplied sensor signals against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Shunt voltage limiter protecting ADC front-end op-amps and multiplexers. Use Value: Prevents input stage saturation and latch-up during ISO 7637-2 Pulse 5a events without adding series resistance or delay. |
Use Scenario: Providing stable 43 V reference for isolated current-sense amplifier gain calibration. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric offset trimming in 4–20 mA loop transmitters. Use Value: Enables <±0.5 % full-scale accuracy over -40 to +105 °C ambient using only passive components. |
| Portable Medical ECG Front-End | Smart Energy Meter Voltage Monitor |
Use Scenario: Biasing high-impedance electrode amplifiers while rejecting common-mode noise above 40 V. IC Role / Device Role / Timing Role: DC reference clamp stabilizing amplifier common-mode voltage during RF interference events. Use Value: Maintains signal integrity and prevents baseline wander without introducing switching artifacts or ground bounce. |
Use Scenario: Monitoring AC mains voltage via resistive divider with overvoltage cutoff at 43 V peak. IC Role / Device Role / Timing Role: Overvoltage protector for microcontroller GPIO pins sampling scaled line voltage. Use Value: Eliminates need for external TVS diodes or optocouplers in Class I metering applications per IEC 62053-21. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ43VCW | Same 43 V nominal, ±5 %, SOT-23, but rated for 250 mW Ptot on FR-4 (vs. 300 mW) | Limited to lower-power bias networks; unsuitable for sustained 2 mA regulation in thermally constrained layouts | Select when footprint compatibility is mandatory and power budget allows 17 % derating |
| BZX84-C43 | Identical electrical specs but G0 suffix (non-green, non-halogen-free); same SOT-23 package and MSL level | Not compliant with RoHS Annex II or JEDEC J-STD-020 MSL 1 moisture sensitivity requirements | Choose only for legacy repair or non-regulated markets where green compliance is not enforced |
Compared with BZX84C43-G3-18, MMBZ43VCW offers identical voltage performance but reduced thermal margin, while BZX84-C43 matches all electrical parameters yet lacks environmental compliance - making the G3-18 version optimal for new designs requiring both performance and regulatory alignment.
Availability
BZX84C43-G3-18 is available at Aetrix Electronics and suitable for automotive body control units, industrial analog input modules, and portable medical device front-ends requiring stable component supply, consistent parametric binning, and full traceability from wafer lot to shipment.
Supply support for BZX84C43-G3-18 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing applications.
The BZX84-G Series targets cost-sensitive, space-constrained designs needing precision voltage regulation - engineered for robustness in harsh environments and compatibility with automated SMT assembly processes.
FAQ
What is the zener voltage tolerance for BZX84C43-G3-18?
The BZX84C43-G3-18 has a nominal zener voltage of 43 V with a tolerance of ±5 %, as indicated by the "C" in the part number. This tolerance is verified at 2 mA test current and 25 °C ambient temperature, and applies across the full operating temperature range of -55 to +150 °C per the Vishay BZX84-G Series datasheet Rev. 1.1.
Can BZX84C43-G3-18 be used in automotive applications?
Yes - the BZX84C43-G3-18 is eligible for automotive use because AEC-Q101 qualified versions are available upon request. While the standard G3-18 variant is commercial grade, its construction, ESD robustness (>8 kV HBM), and operating temperature range (-55 to +150 °C) align with many non-safety-critical automotive subsystems such as lighting control and infotainment power management.
What is the maximum power dissipation for BZX84C43-G3-18 on a standard FR-4 PCB?
The BZX84C43-G3-18 delivers 300 mW maximum power dissipation when mounted on an FR-4 board with Vishay's recommended soldering footprint. This rating assumes natural convection cooling and accounts for thermal resistance junction-to-ambient (RthJA = 420 K/W). Derating is required above 70 °C ambient per the typical power vs. temperature curve in the datasheet.
Does BZX84C43-G3-18 have a defined cathode marking?
Yes - the BZX84C43-G3-18 uses standard SOT-23 polarity marking: a visible band on the package identifies Pin 2 as the cathode. This marking is consistent across all BZX84-G Series devices and corresponds to the cathode terminal in the pinout diagram provided in Vishay document 86345.
What is the reverse leakage current specification for BZX84C43-G3-18?
The BZX84C43-G3-18 specifies a maximum reverse leakage current (IR) of 0.05 μA at a reverse voltage (VR) of 30.1 V, measured at 25 °C. This ultra-low leakage supports high-impedance bias networks and precision reference applications where loading effects must be minimized.
BZX84C43-G3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX84-G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C43-G3-18 FAQ
1.How can I place an order for BZX84C43-G3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C43-G3-18 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 BZX84C43-G3-18 reliable?
The price and inventory of BZX84C43-G3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C43-G3-18 is usually 5 days.
3.What payment methods are accepted for BZX84C43-G3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C43-G3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C43-G3-18?
BZX84C43-G3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C43-G3-18 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 BZX84C43-G3-18?
For technical support, including BZX84C43-G3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C43-G3-18 requirements.
6.How does Aetrix verify that BZX84C43-G3-18 is sourced from the original manufacturer or authorized distributors?
All BZX84C43-G3-18 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 BZX84C43-G3-18 meets industry standards.
7.What is the process for return or replacement of BZX84C43-G3-18?
All BZX84C43-G3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C43-G3-18, 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 BZX84C43-G3-18 part is unused and in its original packaging.
Return procedure for BZX84C43-G3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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