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Nexperia USA Inc. BZX384-B39,115
- Part No.:
- BZX384-B39,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B39,115.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:13,843
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Product details
Overview
BZX384-B39,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 39 V nominal breakdown voltage, 300 mW total power dissipation, and SOD323 (SC-76) surface-mount package. It operates as a precision shunt reference in low-power voltage regulation circuits, delivering stable reverse-biased conduction at 39 V with 3 μA maximum reverse current at 31.2 V and 130 μA typical reverse current at rated voltage.
For engineers reviewing the BZX384-B39,115 datasheet, BZX384-B39,115 pinout, BZX384-B39,115 application, or BZX384-B39,115 equivalent, this page provides verified Zener voltage, differential resistance, thermal resistance, reverse current behavior, and SOD323 terminal mapping - all confirmed from Nexperia's Rev. 4 product data sheet.
Technical Context
This Zener diode functions exclusively in reverse-bias mode to clamp or regulate voltage by maintaining a stable 39 V breakdown across its terminals when reverse current exceeds the knee threshold. Its operation relies on controlled avalanche breakdown, not forward conduction, and requires external current limiting to sustain safe power dissipation.
Thermal performance is defined by junction-to-ambient thermal resistance of 415 K/W on FR4 PCB and junction-to-solder-point resistance of 110 K/W, with absolute maximum junction temperature of 150 °C. Non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, enabling transient overvoltage suppression capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 38.2 V to 39.8 V at IZ = 2 mA - defines usable regulation window under standard test conditions |
| Differential Resistance (rdif) | 350 Ω max at IZ = 2 mA - determines output impedance and regulation sensitivity to load changes |
| Reverse Current (IR) | 130 μA typical at VR = 39 V - quantifies leakage during regulation; impacts quiescent power loss |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets continuous DC power limit before thermal derating applies |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 μs - enables short-duration surge clamping without device failure |
| Junction-to-Ambient Rth(j-a) | 415 K/W - indicates thermal bottleneck in free-air convection; dictates PCB copper area requirements |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - relevant only for accidental forward bias; not used in regulation mode |
Pinout & Package
The BZX384-B39,115 is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias voltage applied here relative to anode |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias current path |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % voltage tolerance | Ensures tight 38.2–39.8 V regulation band at 2 mA, reducing need for post-production trimming |
| Low-profile SOD323 package | Enables high-density PCB layouts in space-constrained consumer and industrial modules |
| 300 mW continuous power rating | Supports stable regulation in low-current applications such as sensor biasing and reference generation |
| 40 W non-repetitive surge capability | Provides transient overvoltage protection without requiring additional TVS components |
| 150 °C maximum junction temperature | Allows reliable operation in extended-temperature industrial environments with proper thermal layout |
Applications
| Power Supply Reference | Sensor Biasing Circuit |
|---|---|
Use Scenario: Providing stable 39 V reference for analog-to-digital converter (ADC) input scaling in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt voltage reference that sinks excess current to maintain precise 39 V at ADC input divider node. Use Value: Enables 12-bit measurement accuracy by minimizing reference drift; 130 μA leakage ensures <1 μW standby loss. |
Use Scenario: Biasing a photodiode amplifier stage requiring fixed reverse bias voltage in optical smoke detection systems. IC Role / Device Role / Timing Role: Zener clamp establishing 39 V reverse bias across photodiode to optimize responsivity and dark current. Use Value: Maintains consistent quantum efficiency across temperature; 350 Ω differential resistance limits signal distortion. |
| Overvoltage Protection Node | Microcontroller Reset Supervision |
Use Scenario: Clamping induced transients on 36 V automotive body-control module supply lines during load dump events. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing 40 W surges for 100 μs to prevent downstream IC damage. Use Value: Eliminates need for discrete TVS diode; 38.2–39.8 V breakdown range ensures activation before 40 V system threshold. |
Use Scenario: Generating a clean reset signal for an ARM Cortex-M0 microcontroller when main 3.3 V rail drops below 2.97 V. IC Role / Device Role / Timing Role: Precision Zener in comparator feedback network to detect undervoltage with ±2 % hysteresis margin. Use Value: Delivers deterministic reset assertion at 39 V reference level scaled via resistor divider; 0.9 V forward drop irrelevant in normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZT52-B39 | Same 39 V ±2 % rating, but 500 mW Ptot, SOD123 package (larger footprint, lower Rth(j-a) = 300 K/W) | Better thermal handling in higher ambient temperatures; requires PCB pad redesign | Select when >300 mW continuous dissipation or improved thermal margin is required |
| Vishay BZX384-C39 | Same SOD323 package, but ±5 % tolerance (37–41 V range), higher 255 μA IR at 39 V | Looser regulation suitable for non-critical biasing where cost is prioritized over precision | Select when tighter voltage control is unnecessary and unit cost reduction is critical |
Compared with BZX384-B39,115, the BZT52-B39 offers higher power headroom and better thermal performance at the cost of board space, while the BZX384-C39 trades regulation accuracy and leakage for lower procurement cost in less demanding applications.
Availability
BZX384-B39,115 is available at Aetrix Electronics and suitable for low-power voltage reference, sensor biasing, overvoltage clamping, and microcontroller reset supervision requiring stable component supply and traceable sourcing.
Supply support for BZX384-B39,115 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 devices, headquartered in Nijmegen, Netherlands.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for compact, low-power voltage regulation and reference applications in consumer, industrial, and communication equipment.
FAQ
What is the maximum continuous reverse current for BZX384-B39,115 at 39 V?
The BZX384-B39,115 draws 130 μA typical reverse current at 39 V and 25 °C, with no specified maximum value in the datasheet. Its safe operating current is determined by the 300 mW power limit: IZ ≤ 300 mW / 39 V ≈ 7.7 mA under ideal thermal conditions. Derating applies above 25 °C ambient.
Can BZX384-B39,115 be used in forward-bias applications?
No - the BZX384-B39,115 is designed exclusively for reverse-bias Zener operation. Its forward voltage is 0.9 V max at 10 mA, but forward conduction is not characterized for regulation or switching use. Forward bias should be avoided except for brief ESD testing or fault analysis.
How does the 350 Ω differential resistance affect regulation accuracy?
A 350 Ω differential resistance means a 1 mA change in Zener current causes approximately 0.35 V shift in regulated voltage. For a 39 V reference, this introduces ±0.9 % error across the full 2–20 mA operating range - acceptable for non-precision applications but insufficient for high-resolution ADC references without buffering.
Is BZX384-B39,115 qualified for automotive applications?
No - per Nexperia's Rev. 4 datasheet revision history, the BZX384 series was explicitly changed to non-automotive qualification in 2023. Automotive-grade alternatives (e.g., BZX384-Q series) are available separately and undergo AEC-Q101 stress testing; this part lacks those qualifications and warranties.
BZX384-B39,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- 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 @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B39,115 FAQ
1.How can I place an order for BZX384-B39,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B39,115 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 BZX384-B39,115 reliable?
The price and inventory of BZX384-B39,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B39,115 is usually 5 days.
3.What payment methods are accepted for BZX384-B39,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B39,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B39,115?
BZX384-B39,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B39,115 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 BZX384-B39,115?
For technical support, including BZX384-B39,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B39,115 requirements.
6.How does Aetrix verify that BZX384-B39,115 is sourced from the original manufacturer or authorized distributors?
All BZX384-B39,115 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 BZX384-B39,115 meets industry standards.
7.What is the process for return or replacement of BZX384-B39,115?
All BZX384-B39,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B39,115, 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 BZX384-B39,115 part is unused and in its original packaging.
Return procedure for BZX384-B39,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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