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Nexperia USA Inc. BZX84W-B39F
- Part No.:
- BZX84W-B39F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B39F.pdf
- Description:
- DIODE ZENER 39V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BZX84W-B39F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 39 V regulation, 350 Ω differential resistance at 2 mA, 36.4 mV/K temperature coefficient, and 0.7 pF capacitance at 1 MHz - used for precision voltage reference and overvoltage clamping in power supply feedback loops.
For engineers reviewing the BZX84W-B39F datasheet, BZX84W-B39F pinout, BZX84W-B39F application, or BZX84W-B39F equivalent, this page delivers verified Zener parameters, SOT323 terminal mapping, thermal derating guidance, and direct substitution options for 39 V stabilization circuits.
Technical Context
This device operates as a reverse-biased Zener diode with stable 39 V breakdown at IZ = 2 mA, exhibiting a positive temperature coefficient of +36.4 mV/K above 6.2 V - enabling predictable drift compensation in temperature-sensitive references.
Its 0.7 pF junction capacitance at 1 MHz and low leakage (<50 nA at 0.7 × VZnom) support high-frequency noise suppression and minimal loading in analog sensing nodes and switching regulator error amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.2 V to 39.8 V at IZ = 2 mA - defines tight regulation window for 39 V reference design |
| Tolerance | ±2 % - enables high-accuracy voltage setting without post-calibration trimming |
| Differential Resistance (rdif) | 350 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +36.4 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Junction Capacitance (Cd) | 0.7 pF at f = 1 MHz, VR = 0 V - ensures minimal signal coupling in RF bypass and fast transient suppression |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - confirms low-loss anode-cathode conduction during forward bias |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling under standard layout |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential side in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; must remain unconnected in PCB layout and schematic |
| 3 | Cathode (K) | Zener breakdown terminal; connected to higher-potential side and voltage reference node |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Reduces need for external trimming in 39 V reference designs, improving production yield |
| 350 Ω max differential resistance | Limits output voltage shift under 1 mA load variation to <0.35 V, supporting stable feedback |
| +36.4 mV/K temperature coefficient | Enables predictable thermal drift modeling for compensation in wide-temperature-range systems |
| 0.7 pF junction capacitance | Minimizes high-frequency loading on oscillator nodes and ADC reference inputs |
| 275 mW power rating on FR4 | Supports continuous operation in compact power management ICs without heatsinking |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing output voltage in adjustable buck converter feedback network using TL431-like topology. IC Role / Device Role / Timing Role: Zener reference element providing precise 39 V threshold for error amplifier comparison. Use Value: ±2 % tolerance ensures ≤±0.78 V output deviation across production units without calibration. |
Use Scenario: Protecting microcontroller I/O pins from 48 V transients in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 39 V before damage threshold is exceeded. Use Value: 0.7 pF capacitance avoids signal integrity degradation on 10 Mbps RS-485 lines. |
| Sensor Signal Conditioning | Reference Voltage Generator |
|
Use Scenario: Biasing bridge-based pressure sensor with stable excitation voltage in automotive cabin modules. IC Role / Device Role / Timing Role: Low-drift Zener source supplying regulated 39 V to Wheatstone bridge top rail. Use Value: +36.4 mV/K coefficient allows accurate software-based thermal compensation using onboard temperature sensor. |
Use Scenario: Generating precision 39 V reference for 16-bit DAC output stage in test equipment. IC Role / Device Role / Timing Role: Primary voltage reference with minimal dynamic loading during DAC settling. Use Value: 350 Ω rdif limits reference droop to <1.75 mV under 5 µA DAC bias current variation. |
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 | ±5 % tolerance, 37.0 V–41.0 V range, 45 pF capacitance | Higher capacitance degrades HF noise rejection; wider tolerance increases system calibration burden | Select when cost sensitivity outweighs precision and speed requirements |
| MMSZ4704T1G | ±5 % tolerance, 37.1 V–40.9 V, 300 Ω rdif, 200 mW Ptot | Lower power rating requires derating above 70 °C ambient; same SOT23 package but different pinout | Choose only if existing SOT23 footprint reuse is mandatory and thermal margin exists |
Compared with BZX84W-B39F, BZX84-C39 trades precision and high-frequency performance for lower unit cost, while MMSZ4704T1G offers slightly better dynamic impedance but sacrifices 27 % power handling and introduces SOT23-to-SOT323 layout incompatibility.
Availability
BZX84W-B39F is available at Aetrix Electronics and suitable for power supply feedback networks, overvoltage protection circuits, and precision reference generation requiring stable component supply across industrial control, test instrumentation, and automotive non-safety subsystems.
Supply support for BZX84W-B39F 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 discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in space-constrained SMT applications where accuracy, thermal predictability, and high-frequency response are critical.
FAQ
What is the maximum reverse current (IR) specification for BZX84W-B39F at VR = 27.3 V?
At VR = 0.7 × VZnom = 27.3 V, the maximum reverse current is 50 nA, measured at Tj = 25 °C. This ultra-low leakage ensures minimal quiescent power draw in battery-powered voltage monitor circuits and preserves accuracy in high-impedance reference dividers.
Can BZX84W-B39F be used in place of a 39 V Zener in a 100 kHz switching regulator feedback loop?
Yes - its 0.7 pF junction capacitance and 350 Ω differential resistance ensure negligible phase shift and voltage error at 100 kHz. Verified measurement data shows stable regulation up to 1 MHz, making it suitable for high-frequency SMPS error amplifiers without bandwidth limitation.
How does the SOT323 package affect thermal performance compared to SOD-323?
BZX84W-B39F uses SOT323 (identical to SC-70), not SOD-323. Its Rth(j-a) is 455 K/W on standard FR4, matching typical SOT323 thermal behavior. No thermal advantage or penalty exists versus other SOT323-packaged Zeners - layout adherence to Nexperia's recommended footprint is essential for rated 275 mW dissipation.
Is BZX84W-B39F qualified for automotive applications?
No - Revision 2 explicitly states this part is non-automotive qualified. It lacks AEC-Q101 stress testing and automotive-grade traceability. For automotive use, Nexperia offers the -Q qualified BZX84W-Q39F variant, which shares electrical specs but adds qualification documentation and lot-level PPAP support.
BZX84W-B39F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B39F FAQ
1.How can I place an order for BZX84W-B39F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B39F 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 BZX84W-B39F reliable?
The price and inventory of BZX84W-B39F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B39F is usually 5 days.
3.What payment methods are accepted for BZX84W-B39F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B39F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B39F?
BZX84W-B39F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B39F 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 BZX84W-B39F?
For technical support, including BZX84W-B39F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B39F requirements.
6.How does Aetrix verify that BZX84W-B39F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B39F 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 BZX84W-B39F meets industry standards.
7.What is the process for return or replacement of BZX84W-B39F?
All BZX84W-B39F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B39F, 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 BZX84W-B39F part is unused and in its original packaging.
Return procedure for BZX84W-B39F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B39F Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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