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Nexperia USA Inc. BZX38450-B47-QX
- Part No.:
- BZX38450-B47-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B47-QX.pdf
- Description:
- DIODE ZENER 47V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
BZX38450-B47-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 47 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B47-QX datasheet, BZX38450-B47-QX pinout, BZX38450-B47-QX application, or BZX38450-B47-QX equivalent, this page delivers verified electrical characteristics, thermal resistance values, reverse leakage behavior at 47 V, and automotive-grade reliability context - all critical for low-bias regulation in battery-powered ECUs and sensor interfaces.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 47 V at IZ = 50 µA, exhibiting a temperature coefficient of +32.9 mV/K and differential resistance of 375 Ω at IZ = 2 mA. Its low test current enables stable regulation in ultra-low-power circuits where bias current must remain below 100 µA.
The device features intentional minor leakage current optimization per AN90031 to improve switching speed and reduce noise in signal conditioning paths. Junction-to-ambient thermal resistance is 415 K/W on FR4 PCB, supporting operation up to 150 °C junction temperature under defined mounting conditions.
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 point for low-current reference applications |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance (rdiff) | 375 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 32.9 V - guarantees minimal quiescent drain in standby circuits |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports extended-range automotive under-hood deployment |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress testing including HTGB, HTRB, and ESD |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal requiring correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks for portable and energy-harvesting systems |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and broadband noise in precision analog front-ends |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress test requirements for temperature cycling, humidity, and high-temperature reverse bias |
| Thermal performance | Rth(j-a) = 415 K/W - allows predictable derating curves for ambient temperatures up to +105 °C in engine control modules |
| Small footprint | SOD323 package - saves board space in compact ECUs and distributed sensor nodes while maintaining solder joint reliability |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 47 V reference for knock sensor biasing and ADC input scaling in gasoline direct injection ECUs. IC Role / Device Role / Timing Role: Zener voltage regulator supplying precision bias current to piezoelectric sensor interface circuitry. Use Value: ±2 % tolerance and low 50 µA test current ensure consistent sensor gain calibration across temperature and vehicle lifetime. |
Use Scenario: Regulating supply to op-amp rails in 4–20 mA loop-powered pressure transmitters operating in hazardous areas. IC Role / Device Role / Timing Role: Low-power shunt regulator establishing isolated reference voltage for analog signal chain. Use Value: 300 mW rating and 150 °C max junction temperature support continuous operation in unventilated enclosures up to 85 °C ambient. |
| Portable Medical Pulse Oximeter | Automotive Cabin Ambient Light Sensor |
Use Scenario: Generating stable bias for photodiode transimpedance amplifier in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Low-current Zener providing fixed reference to set amplifier offset and dynamic range. Use Value: 0.05 µA reverse leakage at 32.9 V minimizes battery drain during multi-day continuous monitoring cycles. |
Use Scenario: Supplying regulated voltage to ambient light sensor IC in automotive infotainment displays. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 47 V rail despite wide input fluctuations from vehicle battery (9–16 V). Use Value: AEC-Q101 qualification and −55 °C to +150 °C operation ensure reliability across cold cranking and hot soak conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C47-Q | ±5 % tolerance, higher rdiff (400 Ω), same 47 V nominal, identical SOD323 package | Less stringent voltage accuracy; suitable for non-critical biasing where cost is prioritized over precision | Select when ±5 % regulation tolerance is acceptable and tighter thermal drift control is not required |
| MMSZ47ET1G | ±5 % tolerance, 500 mW Ptot, 300 Ω rdiff at 5 mA, SOD-123 package (larger footprint) | Higher power handling but larger size; lacks AEC-Q101 qualification and low-leakage optimization | Choose only for non-automotive industrial designs needing higher dissipation and no automotive compliance |
Compared with BZX38450-B47-QX, the BZX384-C47-Q trades voltage accuracy for cost and the MMSZ47ET1G offers higher power at the expense of automotive qualification and board space - making the BZX38450-B47-QX optimal for AEC-Q101-compliant, space-constrained, low-leakage 47 V regulation.
Availability
BZX38450-B47-QX is available at Aetrix Electronics and suitable for automotive engine control units, industrial 4–20 mA transmitters, and portable medical devices requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BZX38450-B47-QX 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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components and advanced packaging.
The BZX38450-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in safety-critical and battery-sensitive automotive subsystems.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B47-QX?
The nominal Zener voltage is 47 V, with a guaranteed minimum of 46.1 V and maximum of 47.9 V at IZ = 50 µA. Breakdown begins within this band; operation above 47.9 V risks exceeding absolute maximum ratings. The device is not rated for sustained operation beyond its specified VZ range.
Can BZX38450-B47-QX be used in parallel for higher current capability?
No - Zener diodes exhibit manufacturing variations in VZ that cause uneven current sharing. Parallel connection risks thermal runaway in the lowest-VZ unit. For higher current, use a single higher-rated Zener or an active regulator topology instead.
Is the SOD323 package compatible with standard reflow profiles?
Yes - the SOD323 package is qualified for lead-free reflow per JEDEC J-STD-020. Recommended peak temperature is 260 °C for ≤ 30 seconds, with ramp rates and soak profiles matching IPC/JEDEC standards for small-outline discrete packages.
Does BZX38450-B47-QX require external series resistance in typical applications?
Yes - a series current-limiting resistor is mandatory to set IZ within 50 µA to 2 mA range and prevent thermal overload. Resistor value is calculated as R = (VIN − VZ) / IZ, with power rating derated for ambient temperature and PCB copper area.
BZX38450-B47-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B47-QX FAQ
1.How can I place an order for BZX38450-B47-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B47-QX 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-B47-QX reliable?
The price and inventory of BZX38450-B47-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B47-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B47-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B47-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B47-QX?
BZX38450-B47-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B47-QX 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-B47-QX?
For technical support, including BZX38450-B47-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B47-QX requirements.
6.How does Aetrix verify that BZX38450-B47-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B47-QX 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-B47-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B47-QX?
All BZX38450-B47-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B47-QX, 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-B47-QX part is unused and in its original packaging.
Return procedure for BZX38450-B47-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B47-QX Tags
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MMBZ5240B-7-F
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