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Nexperia USA Inc. BZX8450-B47R
- Part No.:
- BZX8450-B47R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B47R.pdf
- Description:
- DIODE ZENER 47V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,736
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Product details
Overview
BZX8450-B47R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in portable electronics. It delivers a nominal 47 V regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and 32.9 Ω differential resistance at 2 mA, enabling stable low-power voltage clamping in battery-powered sensor nodes.
For engineers reviewing the BZX8450-B47R datasheet, BZX8450-B47R pinout, BZX8450-B47R application, or BZX8450-B47R equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, and real-world use cases for low-current regulation where leakage control and fast transient response are critical.
Technical Context
This device operates as a reverse-biased Zener diode with a specified working voltage of 46.1 V to 47.9 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at 0 V. Its intentional minor rise in leakage current improves switching speed and noise reduction per AN90031.
Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, limiting continuous power handling to 250 mW at Tamb ≤ 25 °C. Non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, supporting surge protection in low-energy circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 46.1 V to 47.9 V at 50 µA - defines precise clamping threshold for 47 V reference designs |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance (rdiff) | 32.9 Ω at 2 mA - determines load regulation error under varying current conditions |
| Forward Voltage (VF) | ≤ 0.9 V at 10 mA - enables low-loss forward conduction during polarity reversal or ESD events |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum steady-state thermal budget on standard FR4 PCB |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 40.0 V - guarantees minimal standby leakage in always-on circuits |
| Diode Capacitance (Cd) | 40 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent layouts |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided copper FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-bias path entry point for Zener operation |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or thermal stress |
| 3 | Cathode (K) | Connects to higher-potential node; primary heat-sinking terminal and voltage reference output |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in microamp-level bias networks without loading sensitive sources |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and broadband noise in feedback paths |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift over −55 °C to +150 °C ambient range in industrial environments |
| High-voltage Zener capability | Up to 51 V nominal - supports direct regulation from 48 V telecom or PoE-derived rails |
| SOT23 footprint compatibility | Standard 3-terminal layout - allows drop-in replacement in space-constrained portable PCBs |
Applications
| Portable Sensor Biasing | Low-Power Reference Supply |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in wireless IoT nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed 47 V bias for sensor bridge circuitry. Use Value: Enables <1 µA quiescent current operation while maintaining ±0.5 % output stability across temperature and battery discharge. |
Use Scenario: Generating a clean 47 V reference for ADC input scaling in handheld multimeters with dual-supply analog front-ends. IC Role / Device Role / Timing Role: Precision shunt regulator defining upper full-scale voltage threshold. Use Value: Delivers 32.9 Ω dynamic impedance to limit gain error to <0.1 % under 10 µA load variation. |
| ESD-Safe Clamping Node | Low-Energy Surge Limiter |
Use Scenario: Protecting analog input pins of ultra-low-power microcontrollers against electrostatic discharge in medical wearables. IC Role / Device Role / Timing Role: Fast-switching Zener clamp absorbing sub-100 ns transients without latch-up. Use Value: Leverages intentional leakage optimization to reduce ringing and overshoot below 500 mV beyond VZ. |
Use Scenario: Limiting induced surges on 48 V DC power inputs in building automation controllers exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Primary shunt limiter dissipating up to 40 W in 100 µs pulses. Use Value: Maintains regulation within 46.1–47.9 V window during surge, preventing downstream LDO overvoltage failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C47 | ±5 % tolerance, 44.7–49.3 V range at 5 mA, 100 Ω rdiff, no optimized leakage profile | Acceptable for non-critical biasing where cost > precision; unsuitable for noise-sensitive feedback loops | Select when budget constraints outweigh need for tight tolerance or low-noise performance |
| MMSZ47ET1G | ±5 % tolerance, 44.65–49.35 V at 5 mA, 100 Ω rdiff, 500 mW Ptot, SOD-123 package | Higher power rating supports higher continuous current but larger footprint limits space-constrained designs | Choose when thermal margin > board area constraint and 500 mW dissipation is required |
Compared with BZX8450-B47R, BZX84-C47 trades precision and noise performance for cost, while MMSZ47ET1G offers greater power handling at the expense of PCB area and tighter regulation fidelity.
Availability
BZX8450-B47R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reference supplies, ESD-safe clamping nodes, and low-energy surge limiters requiring stable component supply across production lifecycles.
Supply support for BZX8450-B47R 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, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for battery-powered and space-constrained applications demanding precision voltage reference with minimal quiescent current and optimized transient behavior.
FAQ
What is the maximum continuous reverse current the BZX8450-B47R can sustain without degradation?
The device is rated for a maximum forward current of 200 mA, but its Zener operation relies on controlled reverse bias. At 47 V regulation, sustained reverse current must be limited to maintain Ptot ≤ 250 mW - i.e., ≤ 5.3 mA average at 47 V. Exceeding this risks thermal runaway due to 500 K/W junction-to-ambient resistance on standard FR4.
How does the "intentional minor rise of leakage current" improve performance in practice?
Per Application Note AN90031, this controlled leakage reduces minority-carrier storage time, cutting turn-off delay and minimizing voltage overshoot during rapid transitions. In practice, it lowers broadband noise by 3–5 dB in feedback networks and eliminates 10–20 ns ringing observed in standard BZX84-C variants during step-load changes.
Can BZX8450-B47R replace BZX84-C47 in an existing design without layout changes?
Yes - both share identical SOT23 pinning (Anode–n.c.–Cathode) and mechanical dimensions. However, BZX8450-B47R's tighter ±2 % tolerance and lower rdiff (32.9 Ω vs. 100 Ω) may alter loop stability in feedback circuits; verify phase margin and output ripple if used in active regulation topologies.
What is the recommended soldering profile for BZX8450-B47R on FR4 PCBs?
Reflow soldering requires peak temperature ≤ 260 °C for ≤ 30 seconds, with ramp rate ≤ 3 °C/s. Use the footprint in Figure 10: 0.6 mm solder lands, 0.7 mm solder paste stencil openings, and 1.9 mm pin pitch alignment. Avoid wave soldering unless using the dedicated footprint in Figure 11 with 1.4 mm side pads.
BZX8450-B47R 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):
- 47 V
- Tolerance:
- ±2%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B47R FAQ
1.How can I place an order for BZX8450-B47R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B47R 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-B47R reliable?
The price and inventory of BZX8450-B47R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B47R is usually 5 days.
3.What payment methods are accepted for BZX8450-B47R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B47R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B47R?
BZX8450-B47R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B47R 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-B47R?
For technical support, including BZX8450-B47R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B47R requirements.
6.How does Aetrix verify that BZX8450-B47R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B47R 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-B47R meets industry standards.
7.What is the process for return or replacement of BZX8450-B47R?
All BZX8450-B47R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B47R, 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-B47R part is unused and in its original packaging.
Return procedure for BZX8450-B47R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B47R Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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