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Nexperia USA Inc. BZX8450-B43R
- Part No.:
- BZX8450-B43R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B43R.pdf
- Description:
- DIODE ZENER 43V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
BZX8450-B43R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and low-power biasing at 43 V nominal working voltage with ±2 % tolerance, 50 μA test current, and 250 mW total power dissipation - used in portable battery-powered sensor interfaces and microcontroller reset circuits.
For engineers reviewing the BZX8450-B43R datasheet, BZX8450-B43R pinout, BZX8450-B43R application, or BZX8450-B43R equivalent, this page delivers verified electrical characteristics, thermal resistance (330 K/W to solder point), differential resistance (375 Ω at IZ = 0.5 mA), temperature coefficient (+0.05 mV/K), and reverse leakage behavior under VR = 43 V conditions.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 43 V output across load variations by conducting reverse current above its breakdown threshold. Its specified 50 μA test current enables ultra-low quiescent operation ideal for energy-constrained systems.
The BZX8450-B43R exhibits a positive temperature coefficient of +0.05 mV/K and 375 Ω differential resistance at 0.5 mA, indicating moderate regulation stiffness and minimal drift over ambient temperature changes from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V ±2 % at IZ = 50 μA - defines precise regulation point for reference design |
| Differential Resistance | 375 Ω at IZ = 0.5 mA - determines output impedance and load regulation error |
| Temperature Coefficient | +0.05 mV/K - quantifies voltage drift per degree Celsius near 25 °C |
| Forward Voltage | ≤0.9 V at IF = 10 mA - ensures low-loss conduction in forward-biased protection paths |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling |
| Junction Temperature Limit | 150 °C - constrains thermal design margin for reliability in sealed enclosures |
| Reverse Current @ VR = 43 V | ≤0.05 μA - confirms tight leakage control critical for high-impedance bias networks |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, single-sided FR4 PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connects to lower-potential node in shunt regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating or tied to ground only if required by layout |
| 3 | Cathode (K) | Zener breakdown terminal; connects to regulated voltage rail and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 μA - enables use in nanoampere-bias circuits without compromising regulation accuracy |
| Tight voltage tolerance | ±2 % (B-series) - reduces component count in precision references versus ±5 % alternatives |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves switching speed and noise immunity in dynamic bias applications |
| Thermal performance | Rth(j-sp) = 330 K/W - supports reliable operation with minimal copper pour in space-constrained layouts |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Provides stable 43 V reference to enable reset ICs or supervisor circuits in battery-operated edge nodes. IC Role / Device Role / Timing Role: Shunt voltage reference defining threshold for power-on reset assertion. Use Value: Enables deterministic reset timing with <0.05 μA leakage, preserving battery life over multi-year deployments. |
Use Scenario: Supplies regulated bias to MEMS pressure transducers requiring fixed excitation voltage. IC Role / Device Role / Timing Role: Low-current Zener regulator establishing reference potential for analog front-end gain stages. Use Value: Maintains ±0.86 V regulation window (±2 %) across −40 °C to +85 °C, ensuring sensor linearity. |
| Low-Power ADC Reference | LED Driver Current Setpoint |
Use Scenario: Generates clean 43 V reference for 16-bit SAR ADCs in industrial data loggers. IC Role / Device Role / Timing Role: Precision voltage source feeding ADC reference input pin. Use Value: Delivers <150 ppm/°C drift and 375 Ω output impedance, limiting INL error to <0.5 LSB. |
Use Scenario: Sets constant current for high-voltage LED strings in signage modules powered from 48 V rails. IC Role / Device Role / Timing Role: Zener-based current mirror reference in linear LED driver topology. Use Value: Supports 10 mA drive with <2 % setpoint error and negligible self-heating at 250 mW derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | ±5 % tolerance, higher leakage (0.1 μA), same SOT23 package and 43 V nominal | Acceptable where cost sensitivity outweighs precision; unsuitable for sub-μA bias networks | Select when budget constraints dominate and ±5 % regulation error is acceptable in final system calibration |
| MMSZ43ET1G | ±5 % tolerance, 500 mW Ptot, 300 Ω rdiff at 5 mA, same 43 V nominal | Better power handling but higher test current (5 mA); requires larger series resistor | Choose for higher-current regulation (>1 mA) where thermal margin exceeds 250 mW limits of BZX8450-B43R |
Compared with BZX8450-B43R, BZX84-C43 trades precision for cost in low-leakage applications, while MMSZ43ET1G offers higher power capacity at the expense of minimum operating current - making BZX8450-B43R optimal for ultra-low-quiescent, ±2 % reference designs.
Availability
BZX8450-B43R is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, low-power ADC references, and LED driver current setpoints requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX8450-B43R 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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and sustainability.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for precision voltage referencing in battery-powered and space-constrained electronics where low test current and tight tolerance are critical.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B43R?
The BZX8450-B43R has a nominal Zener voltage of 43 V with ±2 % tolerance, meaning breakdown occurs between 42.14 V and 43.86 V at IZ = 50 μA. Absolute maximum non-repetitive peak reverse voltage is not rated; sustained operation above 43.86 V risks exceeding power limits and thermal runaway.
Can BZX8450-B43R be used in series with other Zeners to achieve higher reference voltages?
No - the BZX8450-B43R is not characterized for series stacking. Its 375 Ω differential resistance and ±2 % tolerance do not guarantee matched temperature coefficients or current sharing. Stacking introduces cumulative tolerance error and unequal thermal stress, risking instability.
Does the n.c. pin (pin 2) require PCB routing or grounding?
Pin 2 is internally not connected and must remain electrically floating. Routing or grounding it may cause unintended parasitic coupling or solder bridging. The SOT23 footprint in Figure 10 shows no pad for pin 2, confirming its exclusion from layout.
How does thermal resistance Rth(j-sp) = 330 K/W impact PCB layout decisions?
This value measures junction-to-solder-point resistance, meaning heat flows primarily through the cathode (pin 3) tab. Layout must maximize copper area connected to pin 3, avoid thermal vias under pin 2, and ensure ≥1.5 mm clearance from adjacent heat sources to maintain Tj ≤ 150 °C at 250 mW.
BZX8450-B43R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B43R FAQ
1.How can I place an order for BZX8450-B43R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B43R 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 BZX8450-B43R reliable?
The price and inventory of BZX8450-B43R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B43R is usually 5 days.
3.What payment methods are accepted for BZX8450-B43R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B43R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B43R?
BZX8450-B43R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B43R 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 BZX8450-B43R?
For technical support, including BZX8450-B43R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B43R requirements.
6.How does Aetrix verify that BZX8450-B43R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B43R 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 BZX8450-B43R meets industry standards.
7.What is the process for return or replacement of BZX8450-B43R?
All BZX8450-B43R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B43R, 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 BZX8450-B43R part is unused and in its original packaging.
Return procedure for BZX8450-B43R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B43R Tags
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