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Nexperia USA Inc. BZX38450-B39X
- Part No.:
- BZX38450-B39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B39X.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,483
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Product details
Overview
BZX38450-B39X 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 39 V regulation at 50 µA test current, with ±2 % tolerance, 350 Ω dynamic impedance at 2 mA, and 0.05 µA reverse leakage at rated voltage - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B39X datasheet, BZX38450-B39X pinout, BZX38450-B39X application, or BZX38450-B39X equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, 39 V nominal Zener voltage, SOD323 footprint compatibility, and optimized noise performance per AN90031.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener breakdown threshold. Its 39 V nominal working voltage is characterized at IZ = 50 µA, with differential resistance of 350 Ω at 2 mA and temperature coefficient of +0.05 mV/K - indicating minimal drift over ambient temperature changes.
The BZX38450-B39X features intentional minor leakage current elevation to reduce switching noise and improve transient response, as documented in application note AN90031. Thermal resistance from junction to ambient is 415 K/W on standard FR4 PCB, limiting continuous power dissipation to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 39 V nominal at IZ = 50 µA; ensures precise reference point for low-bias analog circuits |
| Tolerance | ±2 %; enables high-accuracy voltage setting without post-calibration in portable systems |
| Differential Resistance rdiff | 350 Ω at IZ = 2 mA; determines regulation stiffness under varying load conditions |
| Reverse Leakage IR | 0.05 µA at VR = 39 V; minimizes quiescent current drain in always-on battery applications |
| Power Dissipation Ptot | 300 mW max at Tamb ≤ 25 °C; defines safe operating envelope on standard FR4 PCB |
| Forward Voltage VF | 0.9 V at IF = 10 mA; supports bidirectional clamping or dual-use in protection circuits |
| Junction Temperature | 150 °C max; sets thermal reliability limit for sustained operation in compact enclosures |
Pinout & Package
SOD323 (SC-76) surface-mount plastic 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 voltage node; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks without loading error |
| Tight voltage tolerance | ±2 % tolerance band - reduces need for trimming resistors in precision reference designs |
| Noise-optimized leakage | Intentionally elevated leakage per AN90031 - suppresses switching transients in sensitive analog stages |
| Miniature SMD footprint | SOD323 package - saves board space in wearables, IoT sensors, and compact medical devices |
| Thermal robustness | 150 °C max junction temperature - supports reliable operation in unventilated industrial environments |
Applications
| Portable Battery Monitoring | Low-Power Sensor Biasing |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth-enabled trackers with 10-year battery life. IC Role / Device Role / Timing Role: Provides stable 39 V reference for ADC input scaling in ultra-low-quiescent-current monitoring ICs. Use Value: 50 µA regulation current avoids depleting coin-cell energy reserves during long-term storage. |
Use Scenario: Supplying bias voltage to MEMS pressure sensor front-end in environmental data loggers. IC Role / Device Role / Timing Role: Acts as shunt reference to set gain and offset in op-amp signal conditioning chain. Use Value: ±2 % tolerance eliminates factory calibration steps, reducing production test time and cost. |
| Industrial Signal Conditioning | IoT Node Voltage Clamping |
Use Scenario: Isolated 4–20 mA transmitter powering loop-powered analog sensors in factory automation. IC Role / Device Role / Timing Role: Regulates auxiliary supply rail for precision DAC and current-sense amplifier. Use Value: 350 Ω dynamic impedance ensures <1 % output variation across 0–10 kΩ load range. |
Use Scenario: Protecting ESP32 GPIO pins from ESD and overvoltage in outdoor smart-agriculture nodes. IC Role / Device Role / Timing Role: Functions as bidirectional clamp (forward + reverse) on I²C lines. Use Value: 0.9 V forward drop and 39 V reverse breakdown provide symmetric rail-to-rail protection. |
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-C39 | ±5 % tolerance, higher 0.1 µA leakage at 39 V, same SOD323 package | Acceptable where cost sensitivity outweighs accuracy requirements | Select when budget constraints dominate and ±5 % regulation error is acceptable |
| MMSZ4702T1G | 39 V nominal, ±5 %, 500 mW rating, SOD-123 package (larger footprint) | Higher power handling but incompatible with dense SOD323 layouts | Choose only if thermal margin >300 mW is required and board area permits larger package |
Compared with BZX38450-B39X, the BZX384-C39 trades accuracy for cost, while MMSZ4702T1G offers greater power headroom at the expense of PCB real estate and thermal coupling - making the BZX38450-B39X optimal for space-constrained, high-accuracy, ultra-low-power designs.
Availability
BZX38450-B39X is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor biasing, industrial signal conditioning, and IoT node voltage clamping requiring stable component supply across multi-year production cycles.
Supply support for BZX38450-B39X 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, headquartered in Nijmegen, Netherlands.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for voltage reference and biasing in battery-operated and space-constrained electronic systems.
FAQ
What is the maximum continuous reverse power dissipation for BZX38450-B39X?
The maximum continuous total power dissipation is 300 mW at ambient temperature ≤25 °C on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C at 2.4 mW/°C based on thermal resistance of 415 K/W.
Does BZX38450-B39X support bidirectional voltage clamping?
Yes - it conducts forward current up to 250 mA with 0.9 V drop at 10 mA, and regulates in reverse at 39 V, enabling dual-role use as both a Zener reference and a bidirectional transient suppressor on signal lines.
How does the "B" suffix differ from "C" in the BZX38450 series?
The "B" suffix denotes ±2 % tolerance and tighter parameter control, while "C" indicates approximately ±5 % tolerance. Both share identical SOD323 packaging and thermal characteristics but differ in regulation accuracy and leakage behavior.
Is BZX38450-B39X suitable for automotive applications?
No - this device is not AEC-Q200 qualified or tested for automotive use. Nexperia explicitly states non-automotive qualification in its legal disclaimers, and the part lacks automotive-grade screening, temperature range extension, or failure-in-time (FIT) data.
BZX38450-B39X 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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 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-B39X FAQ
1.How can I place an order for BZX38450-B39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B39X 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-B39X reliable?
The price and inventory of BZX38450-B39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B39X is usually 5 days.
3.What payment methods are accepted for BZX38450-B39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B39X?
BZX38450-B39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B39X 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-B39X?
For technical support, including BZX38450-B39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B39X requirements.
6.How does Aetrix verify that BZX38450-B39X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B39X 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-B39X meets industry standards.
7.What is the process for return or replacement of BZX38450-B39X?
All BZX38450-B39X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B39X, 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-B39X part is unused and in its original packaging.
Return procedure for BZX38450-B39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B39X Tags
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