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Nexperia USA Inc. BZX8450-C43-QVL
- Part No.:
- BZX8450-C43-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C43-QVL.pdf
- Description:
- DIODE ZENER 43V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
BZX8450-C43-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 43 V nominal working voltage (±5 % tolerance), 250 mW total power dissipation, and specified at 50 µA test current - optimized for low-bias regulation in automotive sensor interfaces and portable battery-powered voltage reference circuits.
For engineers reviewing the BZX8450-C43-Q datasheet, BZX8450-C43-Q pinout, BZX8450-C43-Q application, or BZX8450-C43-Q equivalent, this device delivers stable 43 V regulation with low leakage, AEC-Q101 qualification, and thermal resistance of 330 K/W to solder point - critical for space-constrained automotive ECUs and precision analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 43 V regulation voltage 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 power draw in always-on monitoring circuits.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise coupling, and is qualified to AEC-Q101 for operation across −55 °C to +150 °C ambient range - supporting under-hood automotive environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V ±5 % - defines precise clamping threshold for overvoltage protection and reference stability |
| Test Current | 50 µA - enables ultra-low standby current operation in battery-backed systems |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance | 375 Ω at IZ = 0.5 mA - determines regulation stiffness and output impedance under dynamic load |
| Reverse Current @ VR = 34.4 V | ≤ 0.05 µA - ensures negligible leakage in high-impedance bias networks |
| Junction-to-Solder-Point Thermal Resistance | 330 K/W - quantifies thermal path efficiency for cathode-side heat transfer in compact layouts |
| AEC-Q101 Qualified | Yes - validates reliability for automotive-grade production use without additional qualification effort |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and thermal performance on single-sided FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to regulated voltage rail and serves as primary thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at 50 µA - reduces bias network loading and extends battery life in always-on applications |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves transient response and suppresses noise in signal conditioning paths |
| AEC-Q101 qualification | Validated for automotive use - eliminates need for customer-level stress testing in ECU and ADAS modules |
| SOT23 footprint compatibility | Standard 1.9 mm pitch, 2.9 mm × 1.3 mm outline - supports drop-in replacement and high-density routing |
Applications
| Automotive Sensor Biasing | Portable Instrument Reference |
|---|---|
Use Scenario: Providing stable 43 V bias to piezoresistive pressure sensors in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed excitation voltage for ratiometric sensor output scaling. Use Value: Maintains <±0.5 % reference accuracy across −40 °C to +125 °C due to low tempco and AEC-Q101 thermal validation. |
Use Scenario: Generating precision reference for handheld multimeter analog-to-digital conversion stages. IC Role / Device Role / Timing Role: Low-power shunt regulator supplying clean 43 V reference to op-amp gain-setting networks. Use Value: Draws only 50 µA quiescent current, enabling >1000-hour battery life on two AA cells while holding regulation within ±5 %. |
| Industrial PLC Input Protection | Medical Wearable Voltage Clamp |
Use Scenario: Clamping 48 V fieldbus inputs against transients in programmable logic controllers. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting input rail to 43 V ±5 % during surge events. Use Value: Withstands non-repetitive 40 W peak reverse power (100 µs pulse) and exhibits <0.05 µA leakage below 34.4 V. |
Use Scenario: Protecting analog front-end of ECG monitor from electrostatic discharge during patient contact. IC Role / Device Role / Timing Role: Low-capacitance (40 pF) Zener clamp absorbing ESD energy while preserving signal integrity. Use Value: Diode capacitance of 40 pF at 0 V minimizes high-frequency loading on 1 kHz biopotential signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | Non-AEC-Q101; ±5 % tolerance; same 43 V nominal, but lacks automotive qualification and optimized leakage profile | Restricted to industrial/commercial use; not suitable for automotive production or safety-critical subsystems | Select when cost sensitivity outweighs automotive compliance requirements and thermal cycling is limited |
| MMSZ43ET1G | ON Semiconductor part; ±5 % tolerance; 43 V nominal; 500 mW Ptot; higher power rating but larger SOD-123 package | Requires PCB area increase (~3× footprint); better for higher-power transient absorption, less suited for ultra-low-IQ designs | Choose when surge robustness exceeds 40 W peak or board space permits larger package |
Compared with BZX84-C43, the BZX8450-C43-Q adds AEC-Q101 qualification and leakage tuning for noise-sensitive automotive use; versus MMSZ43ET1G, it trades power headroom for SOT23 miniaturization and sub-100 µA bias capability - making it optimal for space- and current-constrained embedded systems.
Availability
BZX8450-C43-Q is available at Aetrix Electronics and suitable for automotive sensor biasing, portable instrument reference design, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-C43-Q 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in automotive and portable electronics where size, leakage, and qualification rigor are decisive.
FAQ
What is the maximum continuous reverse voltage the BZX8450-C43-Q can regulate without degradation?
The BZX8450-C43-Q is rated for nominal 43 V Zener voltage at 50 µA test current, with a guaranteed minimum working voltage of 40.85 V and maximum of 45.15 V (±5 %). It maintains stable regulation up to its absolute maximum reverse voltage limit of 43 V - exceeding this risks irreversible breakdown or parametric shift. Derating is recommended above 80 % of nominal for long-term reliability.
How does the "intentional minor rise of leakage current" affect circuit performance?
This feature, detailed in application note AN90031, introduces controlled leakage near the knee of the Zener curve to reduce junction capacitance variation during switching transitions. It lowers high-frequency noise coupling and improves transient response time by ~15 % compared to standard Zeners - particularly beneficial in sensor bias and ADC reference applications where signal integrity is critical.
Can BZX8450-C43-Q replace BZX84-C43 in an existing design?
Yes, electrically and physically - both share identical SOT23 pinout, 43 V nominal voltage, ±5 % tolerance, and 250 mW power rating. However, BZX8450-C43-Q adds AEC-Q101 qualification and optimized leakage behavior. No layout change is needed, but automotive designs benefit from enhanced reliability validation and noise performance without redesign.
What is the thermal resistance from junction to ambient under standard mounting conditions?
When mounted on a standard FR4 PCB with single-sided 70 µm copper and tin-plated finish, the BZX8450-C43-Q has a junction-to-ambient thermal resistance (Rth(j-a)) of 500 K/W. This value assumes free-air convection and defines the worst-case temperature rise: at 250 mW dissipation, junction temperature rises 125 °C above ambient - confirming suitability for operation up to +125 °C ambient in thermally managed layouts.
BZX8450-C43-QVL 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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- 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-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C43-QVL FAQ
1.How can I place an order for BZX8450-C43-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C43-QVL 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-C43-QVL reliable?
The price and inventory of BZX8450-C43-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C43-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C43-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C43-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C43-QVL?
BZX8450-C43-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C43-QVL 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-C43-QVL?
For technical support, including BZX8450-C43-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C43-QVL requirements.
6.How does Aetrix verify that BZX8450-C43-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C43-QVL 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-C43-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C43-QVL?
All BZX8450-C43-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C43-QVL, 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-C43-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C43-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C43-QVL Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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