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Nexperia USA Inc. BZX84J-B39,115
- Part No.:
- BZX84J-B39,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BZX84J-B39,115.pdf
- Description:
- DIODE ZENER 39V 550MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
BZX84J-B39,115 from Nexperia is a ±2 % tolerance Zener diode with nominal 39 V regulation voltage, 550 mW total power dissipation, and AEC-Q101 qualification for automotive use in voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX84J-B39,115 datasheet, BZX84J-B39,115 pinout, BZX84J-B39,115 application, or BZX84J-B39,115 equivalent, this device serves as a precision shunt regulator in low-power supply rails, ESD clamp networks, and sensor biasing where stable reverse breakdown and low differential resistance are critical.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable 39 V reference across its terminals at IZ = 2 mA, with typical differential resistance of 75 Ω and temperature coefficient of +33.4 mV/K - indicating positive drift with junction temperature rise.
It features non-repetitive peak reverse power dissipation of 40 W (tp = 100 μs, square wave), thermal resistance from junction to ambient of 230 K/W on FR4 PCB, and reverse leakage current ≤ 0.05 μA at 30.4 V - enabling robust transient suppression in compact SMD layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V at IZ = 2 mA - defines regulated output voltage under standard test conditions |
| Tolerance | ±2 % - ensures tight voltage accuracy for precision reference applications |
| Total Power Dissipation | 550 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Differential Resistance | 75 Ω at IZ = 2 mA - determines regulation stiffness and output impedance in shunt configuration |
| Reverse Leakage Current | ≤ 0.05 μA at VR = 30.4 V - guarantees minimal standby current in undervoltage clamp circuits |
| Non-repetitive Peak Power | 40 W (tp = 100 μs) - supports surge suppression without permanent degradation |
| Thermal Resistance | 230 K/W (junction-to-ambient) - informs derating requirements above 25 °C ambient |
Pinout & Package
Package: SOD323F (SC-90), ultra-compact surface-mount plastic package with 2 leads, 1.35 mm × 0.80 mm footprint, and cathode-marked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical stress testing |
| Low differential resistance | 75 Ω at 39 V enables <1 % output deviation over ±10 mA load variation in shunt regulator designs |
| Wide voltage range support | Part of 2.4 V–75 V E24 series - allows standardized PCB layout reuse across multiple regulation points |
| Small SOD323F footprint | 0.8 mm × 1.35 mm body size supports high-density routing in space-constrained modules like ADAS sensors |
Applications
| Automotive Sensor Biasing | Industrial Power Rail Clamping |
|---|---|
Use Scenario: Providing stable 39 V reference to analog front-end circuitry in engine control unit (ECU) pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining excitation voltage accuracy despite battery fluctuations. Use Value: ±2 % tolerance and +33.4 mV/K tempco enable <±30 mV drift over −40 °C to +125 °C operating range. |
Use Scenario: Protecting 36 V industrial PLC input stage from transient overvoltage events on field wiring. IC Role / Device Role / Timing Role: Fast-acting clamping element diverting surge energy before downstream IC damage. Use Value: 40 W non-repetitive peak power rating absorbs 100 μs surges up to 1.02 A without failure. |
| Medical Device Reference | Consumer Power Adapter Feedback |
Use Scenario: Generating precise 39 V reference for isolated feedback loop in Class II medical-grade AC/DC converter. IC Role / Device Role / Timing Role: Primary-side voltage sensing node defining output regulation setpoint. Use Value: 550 mW power rating supports continuous operation at 1 mA bias current with margin for ripple. |
Use Scenario: Stabilizing feedback voltage in low-cost 36 V wall adapter using TL431-based topology. IC Role / Device Role / Timing Role: Secondary-side Zener clamp limiting optocoupler LED current during overvoltage faults. Use Value: 0.05 μA leakage at 30.4 V prevents false triggering while maintaining fast response to >39 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39,115 | ±5 % tolerance, higher IR (0.05 μA vs. same), identical VZ and Ptot | Suitable for non-critical biasing where cost sensitivity outweighs voltage accuracy | Select when ±5 % regulation error is acceptable and AEC-Q101 is not required |
| MMSZ4702T1G | 39 V ±5 %, SOD-123 package (larger), 500 mW Ptot, no AEC-Q101 qualification | Compatible with legacy footprints but lacks automotive qualification and thermal performance | Choose only for non-automotive designs requiring backward-compatible SOD-123 mounting |
Compared with BZX84J-B39,115, the BZX84-C39,115 trades voltage accuracy for lower cost, while MMSZ4702T1G sacrifices AEC-Q101 compliance and thermal efficiency for broader distributor availability - making the J-series optimal for new automotive and high-reliability industrial designs.
Availability
BZX84J-B39,115 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, medical power supplies, and consumer adapter feedback circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84J-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 solutions, with leadership in automotive-qualified components.
The BZX84J series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient protection in harsh-environment automotive and industrial systems.
FAQ
What is the maximum continuous forward current for BZX84J-B39,115?
The absolute maximum forward current is 250 mA per limiting values table. However, forward conduction is not its intended operating mode; it is designed for reverse-bias Zener regulation. Continuous forward bias above 100 mA risks exceeding thermal limits due to VF ≈ 1.1 V at that current, generating >110 mW dissipation in a 550 mW-rated package.
Does BZX84J-B39,115 support reflow soldering only, or can it be hand-soldered?
Reflow soldering is the only recommended method per Nexperia's documentation. Hand-soldering introduces uncontrolled thermal stress that may exceed the 260 °C peak temperature limit or cause localized overheating, risking bond wire failure or delamination in the SOD323F package. The datasheet explicitly prohibits wave or hand-soldering.
How does the +33.4 mV/K temperature coefficient affect regulation stability?
This positive coefficient means the Zener voltage increases by ~33.4 mV per °C rise in junction temperature. At 125 °C junction temperature (vs. 25 °C test condition), VZ rises by ~3.34 V - resulting in ~42.3 V regulation. Designers must account for this drift in high-temperature environments or use compensation techniques.
Is the 40 W non-repetitive peak power rating applicable at all temperatures?
No. The 40 W rating applies only at Tj = 25 °C prior to surge, with tp = 100 μs and square-wave waveform. Derating is required at elevated junction temperatures: Fig. 1 shows PZSM drops to ~10 W at Tj = 150 °C. This reflects reduced thermal headroom for transient energy absorption.
BZX84J-B39,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 75 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
BZX84J-B39,115 FAQ
1.How can I place an order for BZX84J-B39,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84J-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 BZX84J-B39,115 reliable?
The price and inventory of BZX84J-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 BZX84J-B39,115 is usually 5 days.
3.What payment methods are accepted for BZX84J-B39,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84J-B39,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84J-B39,115?
BZX84J-B39,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84J-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 BZX84J-B39,115?
For technical support, including BZX84J-B39,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84J-B39,115 requirements.
6.How does Aetrix verify that BZX84J-B39,115 is sourced from the original manufacturer or authorized distributors?
All BZX84J-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 BZX84J-B39,115 meets industry standards.
7.What is the process for return or replacement of BZX84J-B39,115?
All BZX84J-B39,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84J-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 BZX84J-B39,115 part is unused and in its original packaging.
Return procedure for BZX84J-B39,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84J-B39,115 Tags
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