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onsemi BZX84C43LT1
- Part No.:
- BZX84C43LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C43LT1.pdf
- Description:
- DIODE ZENER 43V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,261
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Product details
Overview
BZX84C43LT1 from onsemi is a 43 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 150 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 30 V, used for voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C43LT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode-anode terminal mapping, and direct alternatives for low-power voltage reference and overvoltage protection circuits.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at nominal 43 V with temperature coefficient of +30.1 mV/°C. It exhibits 46.6 pF capacitance at 0 V bias and 1 MHz, and supports pulse-tested Zener voltage measurement per JEDEC JESD22-A114.
The SOT-23 package features void-free thermosetting plastic case, UL 94 V-0 flammability rating, and Pb-free (G-suffix) option. Pin 2 is internally unconnected; only pins 1 (anode) and 3 (cathode) are electrically active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 43 V nominal, 40–46 V range at 5 mA - defines stable regulation point for precision clamping |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous power before thermal derating begins |
| Zener Impedance | 150 Ω max at 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage | 0.05 µA max at 30 V - ensures minimal standby current in high-impedance bias networks |
| Capacitance | 40 pF max at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| Temp Coefficient | +30.1 mV/°C - quantifies voltage drift per degree Celsius rise, critical for temperature-stable references |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated assembly without external protection |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with 1.0 mm × 0.75 mm footprint, 0.99–1.26 mm body width, and 0.36–0.50 mm lead thickness. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased input terminal; connects to lower-potential node in regulation path |
| 2 | No Connection | Internally isolated; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Reverse-biased output terminal; ties to regulated voltage rail or clamping node |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Compliant | G-suffix variant meets RoHS Directive 2011/65/EU without lead-based solder compatibility compromise |
| High ESD Robustness | Class 3 Human Body Model (>16 kV) eliminates need for external TVS in handheld ESD-prone environments |
| Optimized for Automated Assembly | Transfer-molded case geometry and coplanar leads ensure reliable pick-and-place yield on SMT lines |
| Tight Thermal Resistance | 556 °C/W junction-to-ambient on FR-5 board enables predictable thermal modeling in dense layouts |
| Low Capacitance Variant | 40 pF max supports use in RF detector biasing and high-speed signal line clamping |
Applications
| Cellular Phone Power Management | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Regulating bias voltage for RF front-end LNA stages in 4G LTE handsets where board area is constrained. IC Role / Device Role / Timing Role: Zener reference diode providing stable 43 V supply rail for GaAs FET gate biasing. Use Value: Enables compact layout with no external regulator IC, leveraging 225 mW rating and 150 Ω impedance for <±1% output variation across load steps. | Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in portable docking stations. IC Role / Device Role / Timing Role: Standby-mode shunt protector activated only above 43 V threshold to divert surge energy. Use Value: Prevents damage to downstream USB controller ICs using 0.05 µA leakage to avoid loading idle bus, and Class 3 ESD rating to survive repeated human-contact discharges. |
| Industrial Sensor Signal Conditioning | Medical Wearable Battery Monitoring |
Use Scenario: Providing reference voltage for 12-bit ADC input scaling in analog sensor interface modules operating from 48 V DC supply rails. IC Role / Device Role / Timing Role: Precision Zener element establishing known 43 V reference for ratiometric conversion. Use Value: Delivers ±5% initial tolerance and +30.1 mV/°C TC for calibrated offset correction across −40°C to +85°C ambient range. | Use Scenario: Monitoring lithium-ion battery pack voltage via resistive divider with overvoltage cutoff trigger in ECG patch devices. IC Role / Device Role / Timing Role: Low-leakage voltage clamp ensuring divider ratio remains stable during multi-week standby cycles. Use Value: Maintains accuracy with only 0.05 µA IR at 30 V, preventing measurable divider error over 30-day shelf life without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BLT1 | Same 43 V nominal Zener voltage but tighter ±5% tolerance, 100 Ω Zz at 20 mA, 35 pF capacitance | Higher test current rating suits higher-power clamping; lower capacitance benefits RF-sensitive designs | Select when tighter regulation stability under 20 mA load or reduced HF coupling is required |
| BZX84C43-7-F | Identical 43 V rating and ±5% tolerance, but 170 Ω Zz at 5 mA and 45 pF capacitance; same SOT-23 package | Higher dynamic impedance increases voltage droop under load; slightly higher capacitance affects HF response | Choose if sourcing flexibility is prioritized and 150 Ω vs. 170 Ω Zz impact is acceptable in target circuit |
Compared with BZX84C43LT1, MMBZ5267BLT1 offers lower impedance and capacitance for demanding RF or high-current regulation, while BZX84C43-7-F trades minor Zz and C penalties for broader distributor availability-both require validation of thermal derating curves and ESD performance in final layout.
Availability
BZX84C43LT1 is available at Aetrix Electronics and suitable for cellular phone power management, USB port overvoltage protection, and industrial sensor signal conditioning requiring stable component supply across production volumes.
Supply support for BZX84C43LT1 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 supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84CxxxLT1 series targets space-constrained voltage regulation in portable electronics, offering standardized SOT-23 packaging, Pb-free compliance, and scalable Zener voltages from 2.4 V to 75 V.
FAQ
What is the maximum power dissipation of BZX84C43LT1 on an FR-5 board?
The BZX84C43LT1 has a maximum power dissipation of 225 mW on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 1.8 mW/°C, reaching zero dissipation at approximately 158°C ambient. This rating assumes standard JEDEC-defined board conditions and must be validated against actual PCB copper area and airflow in the BZX84C43LT1 application.
Does BZX84C43LT1 have a functional connection on pin 2?
No, pin 2 of the BZX84C43LT1 is internally unconnected (NC). The device uses only pins 1 (anode) and 3 (cathode) for electrical operation. PCB layout must leave pin 2 floating - no trace, pad, or thermal relief should connect to it, as confirmed in the official onsemi datasheet Figure 7 and Package Dimensions section.
What is the reverse leakage current specification for BZX84C43LT1?
The BZX84C43LT1 specifies a maximum reverse leakage current (IR) of 0.05 µA at VR = 30 V and TA = 25°C. This value is measured under standardized test conditions and reflects the diode's ability to maintain high-impedance blocking behavior well below its 43 V Zener voltage, critical for low-power bias networks and precision voltage references.
Is BZX84C43LT1 RoHS-compliant and lead-free?
Yes, the BZX84C43LT1 is RoHS-compliant and available in Pb-free form, indicated by the "G" suffix in part marking (e.g., BZX84C43LT1G). The device meets EU Directive 2011/65/EU requirements, with lead content below 1000 ppm, and is qualified for reflow soldering up to 260°C for 10 seconds per the onsemi packaging specification.
How does temperature affect the Zener voltage of BZX84C43LT1?
The BZX84C43LT1 has a positive temperature coefficient of +30.1 mV/°C at IZT = 5 mA, meaning its Zener voltage increases by approximately 30.1 mV for each degree Celsius rise in junction temperature. This behavior is documented in the Electrical Characteristics table and Typical Characteristics Figure 1, and must be factored into voltage reference accuracy over the −65°C to +150°C operating range of the BZX84C43LT1.
BZX84C43LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 225 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)
BZX84C43LT1 FAQ
1.How can I place an order for BZX84C43LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C43LT1 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 BZX84C43LT1 reliable?
The price and inventory of BZX84C43LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C43LT1 is usually 5 days.
3.What payment methods are accepted for BZX84C43LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C43LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C43LT1?
BZX84C43LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C43LT1 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 BZX84C43LT1?
For technical support, including BZX84C43LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C43LT1 requirements.
6.How does Aetrix verify that BZX84C43LT1 is sourced from the original manufacturer or authorized distributors?
All BZX84C43LT1 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 BZX84C43LT1 meets industry standards.
7.What is the process for return or replacement of BZX84C43LT1?
All BZX84C43LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C43LT1, 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 BZX84C43LT1 part is unused and in its original packaging.
Return procedure for BZX84C43LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C43LT1 Tags
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