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Nexperia USA Inc. BZX8450-C47R
- Part No.:
- BZX8450-C47R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C47R.pdf
- Description:
- DIODE ZENER 47V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,460
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Product details
Overview
BZX8450-C47R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in portable electronics. It delivers a nominal 47 V regulation at 50 µA test current, with ±5 % tolerance, 375 Ω dynamic resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-C47R datasheet, BZX8450-C47R pinout, BZX8450-C47R application, or BZX8450-C47R equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, and real-world use cases in energy-constrained systems where stable low-current regulation is critical.
Technical Context
This Zener diode operates in reverse breakdown mode 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 diode capacitance of 40 pF at 0 V. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, enabling transient suppression in low-duty-cycle monitoring circuits.
The device features intentional minor leakage current elevation (per AN90031) to improve switching speed and reduce noise in analog front-ends. Thermal resistance from junction to solder point is 330 K/W, supporting reliable operation up to 150 °C junction temperature when mounted on standard FR4 PCB with tin-plated copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 44.0 V to 50.0 V at IZ = 50 µA - defines stable regulation range under ultra-low bias conditions |
| Differential Resistance (rdiff) | 375 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 0.05 µA max at VR = 47 V - enables micropower standby operation in always-on circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - supports polarity protection and clamping in dual-rail designs |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard PCB |
| Junction Temperature (Tj) | −55 °C to +150 °C - ensures functionality across industrial and extended-temperature embedded environments |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 mounting with 70 μm tin-plated copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; forward conduction path during overvoltage clamp or biasing |
| 2 | Not Connected (n.c.) | Internally isolated; no electrical function - must remain unconnected in PCB layout |
| 3 | Cathode (K) | Connects to higher-potential node; reverse-biased terminal where Zener breakdown occurs |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at 50 µA - enables accurate voltage reference in µA-level bias networks without loading error |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in signal conditioning paths |
| Tight thermal resistance control | Rth(j-sp) = 330 K/W - ensures predictable derating and thermal stability in compact layouts |
| Standardized SOT23 footprint | Compatible with JEDEC MO-215 - supports automated placement and reflow without custom stencil design |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
|
Use Scenario: Providing stable 47 V reference for high-side current sensing in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise threshold for analog comparator input. Use Value: Enables <1 µA quiescent current in sleep mode while maintaining ±1.5 % reference accuracy across −40 °C to +85 °C. |
Use Scenario: Generating clean reset voltage for 3.3 V microcontrollers powered from 48 V industrial bus rails. IC Role / Device Role / Timing Role: Low-leakage shunt regulator feeding RC delay network for power-on reset timing. Use Value: Delivers <0.05 µA reverse current at 47 V, preventing premature reset release during brown-out recovery. |
| Low-Power Analog Front-End | LED Driver Bias Stabilization |
|
Use Scenario: Stabilizing op-amp supply rail in handheld medical diagnostic devices using coin-cell batteries. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant headroom for rail-to-rail input amplifiers. Use Value: Achieves 375 Ω dynamic resistance at 2 mA, limiting output voltage drift to <20 mV under 100 µA load variation. |
Use Scenario: Setting reference voltage for constant-current LED driver ICs in emergency lighting modules. IC Role / Device Role / Timing Role: Precision voltage clamp defining current-sense resistor bias point. Use Value: Maintains ±5 % tolerance over lifetime, ensuring consistent LED brightness despite battery voltage sag from 42 V to 52 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZT52-C47 | Same 47 V nominal, ±5 % tolerance, but rated at 5 mA test current and 600 Ω rdiff | Higher test current increases power draw in ultra-low-power designs; less suitable for sub-100 µA bias networks | Select BZX8450-C47R when regulation stability at 50 µA is required; choose BZT52-C47 only if higher test current improves system noise immunity |
| Vishay BZX79-C47 | Through-hole DO-35 package, 47 V ±5 %, 1000 Ω rdiff at 5 mA, 500 mW Ptot | Not SMT-compatible; larger footprint and higher thermal mass limit use in space-constrained portable PCBs | Prefer BZX8450-C47R for automated assembly and thermal response-critical applications; retain BZX79-C47 only for legacy through-hole designs |
Compared with BZT52-C47 and BZX79-C47, the BZX8450-C47R offers superior low-current regulation fidelity (50 µA test point), lower dynamic impedance (375 Ω vs ≥600 Ω), and SOT23 compatibility - making it the optimal choice for modern battery-powered instrumentation requiring minimal quiescent current and high layout density.
Availability
BZX8450-C47R is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, low-power analog front-end stabilization, and LED driver bias applications requiring stable component supply across long-lifecycle industrial deployments.
Supply support for BZX8450-C47R 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 ISO/TS 16949-certified manufacturing.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and energy-harvesting systems where regulation accuracy at microampere bias currents is essential.
FAQ
What is the exact Zener voltage tolerance and test condition for BZX8450-C47R?
The BZX8450-C47R has a nominal Zener voltage of 47 V with ±5 % tolerance, measured at a reverse test current of 50 µA and ambient temperature of 25 °C. This low-current specification ensures minimal loading effect in high-impedance reference networks and aligns with its intended use in micropower applications.
Can BZX8450-C47R be used in place of a standard 47 V Zener like BZX79-C47?
No - BZX8450-C47R is not a drop-in replacement for BZX79-C47 due to fundamental differences: it uses SOT23 packaging (vs DO-35), is characterized at 50 µA (vs 5 mA), and exhibits lower dynamic resistance (375 Ω vs 1000 Ω). Substitution requires redesign of bias network and thermal layout to accommodate SMT mounting and ultra-low-current operation.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, the controlled increase in reverse leakage improves switching speed and reduces high-frequency noise by minimizing minority-carrier storage effects. In practice, this yields faster turn-off in transient clamping and cleaner DC references in audio and sensor signal chains - without compromising regulation accuracy or long-term reliability.
What is the maximum allowable continuous power dissipation at 85 °C ambient?
At 85 °C ambient, the BZX8450-C47R's maximum continuous power dissipation is derated to approximately 150 mW, calculated using its 500 K/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature. This assumes standard FR4 PCB mounting with single-sided 70 μm copper and tin plating per datasheet condition [1].
BZX8450-C47R 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C47R FAQ
1.How can I place an order for BZX8450-C47R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C47R 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-C47R reliable?
The price and inventory of BZX8450-C47R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C47R is usually 5 days.
3.What payment methods are accepted for BZX8450-C47R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C47R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C47R?
BZX8450-C47R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C47R 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-C47R?
For technical support, including BZX8450-C47R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C47R requirements.
6.How does Aetrix verify that BZX8450-C47R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C47R 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-C47R meets industry standards.
7.What is the process for return or replacement of BZX8450-C47R?
All BZX8450-C47R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C47R, 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-C47R part is unused and in its original packaging.
Return procedure for BZX8450-C47R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C47R Tags
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