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Nexperia USA Inc. BZX8450-C47-QR
- Part No.:
- BZX8450-C47-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C47-QR.pdf
- Description:
- DIODE ZENER 47V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,997
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Product details
Overview
BZX8450-C47-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers a nominal 47 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and qualified AEC-Q101 reliability - deployed in ECU sensor signal conditioning and battery management reference circuits.
For engineers reviewing the BZX8450-C47-QR datasheet, BZX8450-C47-QR pinout, BZX8450-C47-QR application, or BZX8450-C47-QR equivalent, key selection criteria include low-test-current regulation stability, thermal resistance (Rth(j-a) = 500 K/W), cathode-anode polarity confirmation, and automotive-grade leakage behavior per AN90031.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 44.0 V to 50.0 V at IZ = 50 µA, exhibiting a temperature coefficient of +32.9 mV/K and differential resistance ≤375 Ω at IZ = 2 mA. Its low 50 µA test current enables stable regulation under ultra-low quiescent power conditions.
The device features intentional minor leakage current optimization for fast switching and noise reduction, as documented in application note AN90031. It is rated for junction temperatures up to 150 °C and qualified to AEC-Q101 for automotive use, with non-repetitive peak reverse power dissipation of 40 W at tp = 100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 44.0 V to 50.0 V at IZ = 50 µA - defines precise reference point for low-bias analog circuits |
| Tolerance | ±5 % - supports cost-optimized designs where tighter tolerance is not required |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - ensures minimal forward conduction loss during transient events |
| Junction Temperature (Tj) | −55 °C to +150 °C - enables operation in under-hood automotive environments |
| Thermal Resistance (Rth(j-a)) | 500 K/W - determines temperature rise above ambient under steady-state power |
| Reverse Current (IR) | ≤0.05 µA at VR = 35.3 V - confirms low leakage below regulation threshold |
Pinout & Package
Package: SOT23 plastic surface-mount package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward bias; reverse-biased during Zener operation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder joint |
| 3 | Cathode (K) | Negative terminal; connected to regulated output node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables stable regulation in micro-power battery-backed systems |
| AEC-Q101 Qualification | Qualified for automotive applications - meets stress test requirements for discrete semiconductors |
| Optimized Leakage Profile | Intentional minor IR rise per AN90031 - improves switching speed and reduces noise in dynamic references |
| Thermal Performance | Rth(j-sp) = 330 K/W - supports localized heat transfer via cathode solder point |
| Small-Signal Stability | Capacitance Cd = 40 pF at VR = 0 V, f = 1 MHz - minimizes high-frequency loading in feedback paths |
Applications
| Automotive ECU Reference | Portable Gas Sensor Bias |
|---|---|
Use Scenario: Provides stable 47 V reference for analog front-end amplifiers in engine control unit (ECU) oxygen sensor interfaces. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining constant bias voltage despite supply ripple and load transients. Use Value: Enables accurate sensor signal scaling over −40 °C to +125 °C ambient, leveraging AEC-Q101 qualification and low-temperature-coefficient drift. |
Use Scenario: Supplies calibrated bias voltage to electrochemical gas detection cells in handheld air quality monitors. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed potential across sensing electrodes. Use Value: Delivers stable regulation at 50 µA test current, extending battery life while maintaining <±2 % measurement accuracy over 10-year field deployment. |
| Industrial PLC Input Protection | Medical Infusion Pump Feedback |
Use Scenario: Clamps and regulates input voltage to analog-to-digital converter (ADC) channels in programmable logic controller (PLC) modules. IC Role / Device Role / Timing Role: Overvoltage protection and reference stabilization element in 24 V industrial signal chains. Use Value: Limits transient-induced ADC saturation using 40 W non-repetitive surge capability and 250 mW continuous dissipation margin. |
Use Scenario: Sets reference voltage for pressure transducer signal conditioning in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Low-noise voltage reference ensuring consistent gain calibration across production batches. Use Value: Reduces system-level drift via optimized leakage profile (AN90031), meeting IEC 60601-1 leakage current limits for patient-connected devices. |
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-C47 | Non-automotive grade; no AEC-Q101 qualification; same 44–50 V range and ±5 % tolerance | Limited to commercial/industrial use; unsuitable for automotive safety-critical subsystems | Select when AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs |
| MMSZ47ET1G | ON Semiconductor part; 44.7–49.3 V range at IZ = 1 mA; 500 mW Ptot; SOD-123 package | Different thermal resistance (Rth(j-a) ≈ 350 K/W); higher test current shifts regulation point under low-bias conditions | Choose for higher power margin and improved thermal performance, accepting larger footprint and different bias-point behavior |
Compared with BZX8450-C47-QR, BZX84-C47 lacks automotive qualification and long-term reliability validation, while MMSZ47ET1G offers higher power rating but requires revalidation of low-current regulation stability due to its 1 mA test condition.
Availability
BZX8450-C47-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable sensor biasing, and industrial PLC input conditioning requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX8450-C47-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 delivering high-performance, reliable discrete, logic, and MOSFET devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference in harsh-environment electronics such as engine control, ADAS sensors, and battery monitoring systems.
FAQ
What is the exact Zener voltage range for BZX8450-C47-QR at 50 µA test current?
The BZX8450-C47-QR has a guaranteed working voltage range of 44.0 V to 50.0 V when measured at IZ = 50 µA and Tj = 25 °C, per Table 9 of the Rev. 3 datasheet. This ±5 % tolerance band ensures predictable regulation in low-bias applications without requiring external trimming.
Why does Pin 2 show 'n.c.' and how should it be handled on the PCB?
Pin 2 is internally not connected and must remain electrically floating - no trace, pad, or solder joint should be placed on it. The SOT23 footprint must follow Nexperia's recommended layout (Fig. 10), where Pin 2 lands are omitted or masked to prevent accidental shorting or solder bridging during reflow.
How does the AEC-Q101 qualification impact reliability in automotive use?
AEC-Q101 qualification confirms that BZX8450-C47-QR passed accelerated stress tests including HTGB, HTRB, and temperature cycling, ensuring ≥150 °C junction operation and 10+ year field reliability in under-hood environments. It is approved for non-safety-critical automotive functions per Nexperia's automotive suitability statement.
Can BZX8450-C47-QR replace BZX84-C47 in an existing design?
Yes, electrically - same voltage range, tolerance, and package - but only if automotive qualification is not required. BZX8450-C47-QR adds AEC-Q101 validation, enhanced leakage control per AN90031, and extended temperature capability; redesign verification is recommended for safety-critical deployments.
BZX8450-C47-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-C47-QR FAQ
1.How can I place an order for BZX8450-C47-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C47-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-C47-QR reliable?
The price and inventory of BZX8450-C47-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-C47-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C47-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C47-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C47-QR?
BZX8450-C47-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C47-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-C47-QR?
For technical support, including BZX8450-C47-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C47-QR requirements.
6.How does Aetrix verify that BZX8450-C47-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C47-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-C47-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C47-QR?
All BZX8450-C47-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C47-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-C47-QR part is unused and in its original packaging.
Return procedure for BZX8450-C47-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C47-QR Tags
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