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onsemi BZX84C43LT1G
- Part No.:
- BZX84C43LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C43LT1G.pdf
- Description:
- DIODE ZENER 43V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,745
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Product details
Overview
BZX84C43LT1G from onsemi is a 43 V ±7% standard-tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 150 Ω dynamic impedance at 5 mA test current and 80 µA max reverse leakage at 34.4 V. It provides precision voltage regulation in space-constrained DC power rails of portable electronics.
For engineers reviewing the BZX84C43LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±7%), thermal coefficient (+30.1 mV/°C), junction capacitance (40 pF at 0 V), and SOT-23 footprint compatibility with automated assembly processes.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon PN junction. Its Zener voltage is specified at three test currents (2 mA, 5 mA, 20 mA) to support design validation across load conditions, with temperature coefficient tightly characterized from −55°C to +150°C.
The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and cathode polarity indicated by a band. Pin 2 is internally unconnected - a structural terminal with no electrical function - enabling simplified PCB layout while maintaining mechanical stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–46 V at IZT = 5 mA; defines regulated output voltage range under typical bias |
| Power Dissipation | 250 mW on FR-5 board at 25°C; sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 150 Ω at IZT = 5 mA; determines output voltage variation under changing load current |
| Reverse Leakage Current | ≤80 µA at VR = 34.4 V; limits standby power loss in high-impedance bias networks |
| Junction Capacitance | 40 pF at VR = 0 V, f = 1 MHz; impacts high-frequency noise filtering and transient response |
| Temperature Coefficient | +30.1 mV/°C at IZT = 5 mA; quantifies voltage drift per degree Celsius over operating range |
| ESD Rating | Class 3 (>16 kV) HBM; ensures robustness during handling and board assembly without external protection |
Pinout & Package
SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, Pb-free, RoHS compliant. Cathode identified by band; pin 2 is internal no-connect terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC input node for reverse-bias operation; connects to lower-potential side of regulated rail |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode | Regulated output node; connects to higher-potential side and serves as voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Standard-tolerance Zener regulation | ±7% VZ tolerance at 5 mA enables cost-effective voltage clamping without tight-bin sorting |
| Automated assembly optimized package | SOT-23 footprint supports high-speed pick-and-place and reflow soldering on dense PCBs |
| High ESD immunity | Class 3 (>16 kV) Human Body Model rating eliminates need for external ESD protection in most portable designs |
| Thermal stability | +30.1 mV/°C tempco allows predictable voltage shift in automotive or industrial ambient variations |
| Pb-free and RoHS compliance | Meets global environmental directives without performance trade-offs or process requalification |
Applications
| Overvoltage Protection | Reference Voltage Source |
|---|---|
Use Scenario: Clamp transient surges on 36 V DC supply lines in automotive body control modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 43 V threshold. Use Value: Limits downstream IC damage using only 250 mW dissipation capability and 150 Ω dynamic impedance to hold clamped voltage within safe margin. |
Use Scenario: Provide stable 43 V reference for analog-to-digital converter input scaling in industrial sensor transmitters. IC Role / Device Role / Timing Role: Passive voltage reference establishing known full-scale input level. Use Value: Delivers <±7% accuracy and +30.1 mV/°C drift compensation for repeatable 12-bit measurement linearity across −40°C to +85°C. |
| Power Supply Feedback | Signal Level Translation |
Use Scenario: Set output voltage of isolated flyback converter via optocoupler feedback network. IC Role / Device Role / Timing Role: Zener element defining error amplifier reference in secondary-side regulation loop. Use Value: Enables compact feedback path with 40 pF junction capacitance minimizing phase lag and maintaining loop stability at 500 kHz switching frequency. |
Use Scenario: Shift logic-level signals between 5 V microcontroller and 43 V sensor interface in battery management systems. IC Role / Device Role / Timing Role: Bidirectional level translator leveraging forward conduction (0.9 V @ 10 mA) and reverse breakdown (43 V). Use Value: Supports dual-mode operation with 0.9 V forward drop preserving low-voltage logic integrity and 43 V reverse clamp protecting MCU I/O pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C43LT3G | Same electrical specs; supplied in 10,000-piece tape-and-reel vs. 3,000-piece for BZX84C43LT1G | Identical functional behavior; differs only in packaging quantity and reel orientation | Select BZX84C43LT3G for high-volume production runs requiring fewer reel changes |
| BZX84B43LT1G | Tighter ±5% VZ tolerance (vs. ±7%), same 43 V nominal, 150 Ω ZZT, and SOT-23 package | Higher precision reference needed where 2% absolute voltage error is unacceptable | Choose BZX84B43LT1G when system calibration or ADC reference stability demands tighter initial tolerance |
Compared with BZX84C43LT1G, BZX84C43LT3G offers identical performance in larger reels for manufacturing efficiency, while BZX84B43LT1G trades ±7% tolerance for ±5% at equal cost and form factor - making it preferable for metrology-critical signal chains but unnecessary for general-purpose clamping.
Availability
BZX84C43LT1G is available at Aetrix Electronics and suitable for overvoltage protection, reference voltage generation, and power supply feedback applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX84C43LT1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
BZX84C43LT1G belongs to the BZX84CxxxLT1G series of standard-tolerance Zener diodes designed specifically for cost-sensitive, high-density voltage regulation in portable and space-constrained electronics.
FAQ
What is the Zener voltage tolerance of BZX84C43LT1G?
The BZX84C43LT1G has a nominal Zener voltage of 43 V with a tolerance of ±7%, meaning its actual breakdown voltage falls between 40 V and 46 V when tested at 5 mA. This tolerance is defined per the BZX84CxxxLT1G series standard specification and verified across production lots. The BZX84C43LT1G datasheet confirms this range in the Electrical Characteristics table on page 3.
Does BZX84C43LT1G have a connected pin 2?
No, pin 2 of the BZX84C43LT1G is a no-connect terminal - it serves only a mechanical support function within the SOT-23 package and carries no electrical signal. The official marking diagram and mechanical outline (Style 8) in the BZX84C43LT1G datasheet explicitly define pin 1 as anode, pin 2 as no connection, and pin 3 as cathode. PCB layout must leave pin 2 unconnected.
What is the maximum power dissipation of BZX84C43LT1G on FR-5 board?
The BZX84C43LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient temperature, with thermal derating of 2.0 mW/°C above that temperature. This rating is specified in the Maximum Ratings table of the BZX84C43LT1G datasheet and applies to standard JEDEC-compliant FR-5 substrates measuring 1.0 × 0.75 × 0.62 inches.
How does temperature affect the Zener voltage of BZX84C43LT1G?
The BZX84C43LT1G exhibits a positive temperature coefficient of +30.1 mV/°C at 5 mA test current, meaning its Zener voltage increases linearly with junction temperature. This value is measured and published in the Electrical Characteristics table for BZX84C43LT1G. At 100°C junction temperature, the voltage shift from 25°C baseline is approximately +2.26 V, which must be accounted for in precision reference designs.
Is BZX84C43LT1G RoHS compliant and Pb-free?
Yes, BZX84C43LT1G is fully RoHS compliant and Pb-free, as confirmed in the "Features" section and ordering information table of the official BZX84C43LT1G datasheet. The "G" suffix in the part number denotes Pb-free packaging, and the device meets EU Directive 2011/65/EU requirements without exemptions. onsemi also certifies compliance with J-STD-609 moisture sensitivity and IPC/JEDEC standards.
BZX84C43LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C43LT1G FAQ
1.How can I place an order for BZX84C43LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C43LT1G 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 BZX84C43LT1G reliable?
The price and inventory of BZX84C43LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C43LT1G is usually 5 days.
3.What payment methods are accepted for BZX84C43LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C43LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C43LT1G?
BZX84C43LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C43LT1G 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 BZX84C43LT1G?
For technical support, including BZX84C43LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C43LT1G requirements.
6.How does Aetrix verify that BZX84C43LT1G is sourced from the original manufacturer or authorized distributors?
All BZX84C43LT1G 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 BZX84C43LT1G meets industry standards.
7.What is the process for return or replacement of BZX84C43LT1G?
All BZX84C43LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C43LT1G, 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 BZX84C43LT1G part is unused and in its original packaging.
Return procedure for BZX84C43LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C43LT1G Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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