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Nexperia USA Inc. BZX8450-B43-QR
- Part No.:
- BZX8450-B43-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B43-QR.pdf
- Description:
- DIODE ZENER 43V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,751
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Product details
Overview
BZX8450-B43-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 43 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8450-B43-QR datasheet, BZX8450-B43-QR pinout, BZX8450-B43-QR application, or BZX8450-B43-QR equivalent, this device serves precision low-bias regulation in battery-powered sensors, ECU reference rails, and automotive infotainment standby supplies where leakage-sensitive, stable reverse breakdown is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ of 42.1 V (min) to 43.9 V (max) at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance of 375 Ω at IZ = 0.5 mA. Its low test current enables minimal quiescent draw in always-on circuits.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise coupling, and achieves thermal resistance Rth(j-a) = 500 K/W on FR4 PCB - critical for thermal design in confined automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V - precise regulation point at 50 µA, enabling accurate biasing of low-power analog stages |
| Voltage Tolerance | ±2 % - tight binning ensures predictable rail stability across production batches |
| Max Power Dissipation | 250 mW - limits self-heating under continuous operation on standard FR4 PCB |
| Forward Voltage | 0.9 V at 10 mA - defines forward conduction threshold for polarity protection or clamping |
| Junction Temperature | 150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and HTRB |
| Package | SOT23 - surface-mount footprint (2.9 × 1.3 × 1.0 mm) compatible with high-volume reflow assembly |
Pinout & Package
Package: SOT23 plastic surface-mounted package with 1.9 mm pin pitch, 2.9 mm × 1.3 mm × 1.0 mm body dimensions, and tin-plated copper leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current during fault conditions |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating - no PCB trace or solder mask opening required |
| 3 | Cathode (K) | Connected to regulated output node; provides stable reference potential when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces standby current in battery-critical systems by >95 % vs. conventional 5 mA Zeners |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - suppresses switching noise in adjacent RF or ADC circuits |
| Automotive qualification | AEC-Q101 compliant - includes HTGB, TC, and HTRB testing for 15-year vehicle lifetime assurance |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for post-assembly trimming in reference supply designs |
| Thermal performance | Rth(j-sp) = 330 K/W - enables direct thermal coupling to cathode pad for improved power handling in compact layouts |
Applications
| Automotive ECU Reference Rail | Portable Gas Sensor Bias |
|---|---|
|
Use Scenario: Stable 43 V reference for microcontroller ADC input scaling and CAN transceiver VIO bias in engine control units. IC Role / Device Role / Timing Role: Zener regulator providing fixed reverse-bias voltage to set analog front-end gain and logic-level translation thresholds. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure consistent sensor calibration and communication integrity over -40 °C to +125 °C ambient. |
Use Scenario: Low-quiescent bias supply for electrochemical CO detection cells powered by coin-cell batteries. IC Role / Device Role / Timing Role: Voltage clamp establishing precise anode potential for gas-sensing electrode polarization. Use Value: 50 µA test current minimizes battery drain while maintaining <1 % regulation error across 10-year shelf life. |
| Infotainment Standby Regulator | Industrial PLC Input Protection |
|
Use Scenario: Always-on 43 V rail powering real-time clock and wake-up interrupt circuitry in head unit modules. IC Role / Device Role / Timing Role: Low-leakage Zener maintaining regulated voltage during deep sleep modes with <100 nA system current. Use Value: Optimized leakage profile prevents noise injection into RTC oscillator circuitry, preserving timekeeping accuracy. |
Use Scenario: Overvoltage clamp on 24 V digital input channel of programmable logic controller I/O module. IC Role / Device Role / Timing Role: Transient suppressor limiting input voltage to safe levels during field-wiring faults or inductive kickback events. Use Value: 40 W non-repetitive peak power rating (100 µs) absorbs surge energy without degradation, extending field service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | ±5 % tolerance, 350 mW Ptot, non-AEC-Q101 | General-purpose industrial use only; unsuitable for automotive qualification requirements | Select when cost sensitivity outweighs automotive compliance and tighter voltage stability needs |
| MMSZ43ET1G | ±5 % tolerance, 500 mW Ptot, SOD-123 package, 300 ns switching speed | Larger footprint, higher power handling, but lacks intentional leakage optimization for noise reduction | Prefer for high-transient environments requiring robust surge absorption, not low-noise precision biasing |
Compared with BZX8450-B43-QR, BZX84-C43 trades voltage accuracy and automotive qualification for lower cost, while MMSZ43ET1G offers higher power margin and faster response but sacrifices noise-optimized leakage behavior and SOT23 space efficiency.
Availability
BZX8450-B43-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable sensor systems, infotainment standby power, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-B43-QR 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 focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener regulator portfolio, engineered specifically for low-current, low-noise, AEC-Q101-compliant voltage reference and clamping in space-constrained automotive electronics.
FAQ
What is the exact Zener voltage range for BZX8450-B43-QR at 50 µA?
The guaranteed Zener voltage range is 42.1 V (minimum) to 43.9 V (maximum) at IZ = 50 µA and Tj = 25 °C, per Table 9 of the Rev. 3 datasheet. This ±2 % tolerance is measured under strictly controlled low-current conditions to ensure repeatability in battery-sensitive applications.
Is Pin 2 truly unconnected, and can it be left floating on the PCB?
Yes, Pin 2 is internally not connected (n.c.) and must remain electrically floating - no solder mask opening, trace, or thermal pad should be assigned to it. The SOT23 outline drawing (Fig. 9) and Pinning Table 2 explicitly confirm this, and connecting it risks mechanical stress or unintended parasitic paths.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per Application Note AN90031, this controlled leakage improves transient response and reduces high-frequency noise coupling into adjacent analog or RF circuits. It enables faster recovery after overvoltage events and lowers EMI in mixed-signal automotive modules without compromising DC regulation accuracy.
Can BZX8450-B43-QR replace older BZX84-B43 variants in existing designs?
Yes - it maintains identical electrical specifications, SOT23 pinout, and footprint, but adds AEC-Q101 qualification and the optimized leakage profile. No layout or schematic changes are needed; however, qualification documentation must be updated to reflect the Q-series automotive compliance status for new automotive releases.
BZX8450-B43-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B43-QR FAQ
1.How can I place an order for BZX8450-B43-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B43-QR 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-B43-QR reliable?
The price and inventory of BZX8450-B43-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B43-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B43-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B43-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B43-QR?
BZX8450-B43-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B43-QR 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-B43-QR?
For technical support, including BZX8450-B43-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B43-QR requirements.
6.How does Aetrix verify that BZX8450-B43-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B43-QR 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-B43-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B43-QR?
All BZX8450-B43-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B43-QR, 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-B43-QR part is unused and in its original packaging.
Return procedure for BZX8450-B43-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B43-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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