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Nexperia USA Inc. BZX38450-B47X
- Part No.:
- BZX38450-B47X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B47X.pdf
- Description:
- DIODE ZENER 47V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,211
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Product details
Overview
BZX38450-B47X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 47 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 375 Ω differential resistance at 2 mA, enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B47X datasheet, BZX38450-B47X pinout, BZX38450-B47X application, or BZX38450-B47X equivalent, key selection criteria include its 47 V nominal Zener voltage, low 50 µA test current specification, ±2 % tolerance grade, thermal resistance of 110 K/W to solder point, and SOD323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode 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 reverse bias and 1 MHz. Its differential resistance rises to 375 Ω at 2 mA, reflecting controlled impedance behavior under light load conditions.
The device supports non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and maintains junction temperatures up to 150 °C. Thermal resistance from junction to solder point is 110 K/W, confirming suitability for thermally constrained surface-mount applications with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 46.1 V to 47.9 V at IZ = 50 µA - defines precise regulation threshold for low-bias reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-manufacturing trimming |
| Differential Resistance rdiff | 375 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation Ptot | 300 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 - enables predictable forward conduction for polarity protection or clamping |
| Reverse Current IR | ≤ 0.05 µA at VR = 35.3 V - guarantees minimal leakage below regulation knee, critical for battery life |
| Thermal Resistance Rth(j-sp) | 110 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in microamp-level bias networks without loading sensitive sources |
| Controlled leakage optimization | Intentional minor rise in IR for B-series - improves switching speed and reduces noise in dynamic reference applications |
| High-voltage precision grade | ±2 % tolerance at 47 V - eliminates need for external trimming in mid-range voltage references |
| Thermally robust SMD package | Rth(j-sp) = 110 K/W - allows direct thermal coupling to PCB copper for reliable operation at 125 °C ambient |
Applications
| Portable Gas Sensor Biasing | IoT Node Reference Supply |
|---|---|
Use Scenario: Providing stable excitation voltage to electrochemical gas sensing elements in battery-operated detectors. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to generate fixed 47 V bias for sensor heater control circuitry. Use Value: Low 50 µA test current minimizes drain on coin-cell batteries; ±2 % tolerance ensures repeatable sensor calibration across production units. |
Use Scenario: Generating a clean, low-drift reference for ADC input scaling in LPWAN endpoint devices. IC Role / Device Role / Timing Role: Precision shunt regulator establishing 47 V reference rail for high-resolution analog front-end conditioning. Use Value: 375 Ω differential resistance limits output impedance variation under load; 40 pF capacitance avoids signal integrity issues at 1 MHz sampling rates. |
| Industrial Signal Conditioning | Medical Wearable Power Monitoring |
Use Scenario: Stabilizing auxiliary supply for op-amp biasing in isolated 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Low-current Zener regulator maintaining constant headroom for rail-to-rail output stages. Use Value: 300 mW power rating accommodates transient overvoltage events; SOD323 footprint enables compact layout in DIN-rail mount enclosures. |
Use Scenario: Supplying regulated voltage to analog health monitoring ICs in rechargeable ECG patch devices. IC Role / Device Role / Timing Role: Voltage reference element in low-quiescent-current LDO feedback network. Use Value: ≤0.05 µA reverse leakage at 35.3 V preserves multi-week standby time; thermal resistance supports operation near skin-contact zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C47 | ±5 % tolerance, higher leakage (0.05 µA at VR = 35.3 V), same 47 V nominal VZ | Acceptable where cost sensitivity outweighs precision; less suitable for calibrated medical sensors | Select when budget constraints dominate and ±5 % regulation error is acceptable in system-level tolerance stack-up |
| MMSZ47ET1G | Same SOD-123 package, ±5 % tolerance, 500 mW Ptot, 400 Ω rdiff at 5 mA | Higher power capability but larger footprint; not drop-in compatible due to different pad geometry | Choose only if board redesign permits SOD-123 placement and system requires >300 mW dissipation margin |
Compared with BZX38450-B47X, the BZX384-C47 trades precision for cost in non-critical references, while MMSZ47ET1G offers higher power but requires PCB rework-neither matches the 47 V/±2 %/SOD323 combination in a single, optimized package.
Availability
BZX38450-B47X is available at Aetrix Electronics and suitable for portable gas sensor biasing, IoT node reference supply, and industrial signal conditioning requiring stable component supply with guaranteed long-term traceability and consistent parametric performance.
Supply support for BZX38450-B47X 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 focus on efficiency, miniaturization, and sustainability.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained and space-limited applications demanding tight voltage accuracy without active regulation overhead.
FAQ
What is the maximum continuous reverse voltage the BZX38450-B47X can sustain without breakdown?
The BZX38450-B47X is rated for a nominal Zener voltage of 46.1 V to 47.9 V at 50 µA test current. Its absolute maximum reverse voltage before irreversible damage is defined by the non-repetitive peak reverse power limit of 40 W for 100 µs pulses-not a DC rating. Continuous operation must remain within the 47 V regulation band and 300 mW total power dissipation limit at ambient ≤25 °C.
Can the BZX38450-B47X be used in series or parallel configurations for higher voltage or current handling?
Series connection is feasible to achieve higher reference voltages, but mismatched temperature coefficients (e.g., +0.05 mV/K per device) cause tracking errors. Parallel use is strongly discouraged due to thermal runaway risk-minor VZ variations cause current hogging. For >300 mW needs, a heatsinked higher-power Zener or active regulator is required instead.
How does the "intentional minor rise of leakage current" affect circuit noise performance?
This design feature, documented in AN90031, slightly increases reverse leakage to reduce junction capacitance transients during switching transitions. Measured outcome is lower broadband noise in dynamic reference applications-particularly beneficial in high-gain sensor amplifiers where Zener noise couples into signal paths.
Is the SOD323 footprint of BZX38450-B47X compatible with automated optical inspection (AOI) systems?
Yes-the SOD323 package has standardized 1.3 mm lead pitch and 1.7 mm × 1.25 mm body dimensions per JEDEC MO-203, ensuring full compatibility with industry-standard AOI algorithms. The cathode bar marking provides unambiguous polarity identification for automated verification during SMT line inspection.
BZX38450-B47X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 300 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:
- SOD-323
BZX38450-B47X FAQ
1.How can I place an order for BZX38450-B47X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B47X 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 BZX38450-B47X reliable?
The price and inventory of BZX38450-B47X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B47X is usually 5 days.
3.What payment methods are accepted for BZX38450-B47X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B47X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B47X?
BZX38450-B47X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B47X 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 BZX38450-B47X?
For technical support, including BZX38450-B47X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B47X requirements.
6.How does Aetrix verify that BZX38450-B47X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B47X 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 BZX38450-B47X meets industry standards.
7.What is the process for return or replacement of BZX38450-B47X?
All BZX38450-B47X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B47X, 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 BZX38450-B47X part is unused and in its original packaging.
Return procedure for BZX38450-B47X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B47X Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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