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Nexperia USA Inc. BZX84W-C39F
- Part No.:
- BZX84W-C39F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C39F.pdf
- Description:
- DIODE ZENER 39V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,831
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Product details
Overview
BZX84W-C39F from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 39 V breakdown voltage, 350 Ω differential resistance at IZ = 2 mA, and 36.4 mV/K temperature coefficient, housed in an SOT323 (SC-70) package for space-constrained power rail stabilization in industrial sensor signal conditioning circuits.
For engineers reviewing the BZX84W-C39F datasheet, BZX84W-C39F pinout, BZX84W-C39F application, or BZX84W-C39F equivalent, this part supports precision voltage reference design, overvoltage clamping in analog front-ends, and low-power supply regulation where thermal stability and tight voltage tolerance are critical selection criteria.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load current. Its 39 V nominal Zener voltage is specified at IZ = 2 mA with ±5 % tolerance, and exhibits a positive temperature coefficient of +36.4 mV/K - indicating voltage increases with junction temperature.
The device delivers 275 mW total power dissipation on FR4 PCB with single-sided copper, and supports non-repetitive peak reverse power up to 40 W for surge protection. Its 0.7 pF diode capacitance at 1 MHz and 0 V bias enables use in high-frequency noise suppression without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal at IZ = 2 mA; defines regulated output voltage level in shunt regulator configurations |
| Tolerance | ±5 % (C-series); sets worst-case voltage deviation for supply margining and reference accuracy budgets |
| Differential Resistance (rdiff) | 350 Ω max at IZ = 2 mA; determines output impedance and load regulation error sensitivity |
| Temperature Coefficient (SZ) | +36.4 mV/K; quantifies voltage drift per degree Celsius rise, critical for thermal design in unheated enclosures |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; ensures low conduction loss when used bidirectionally or in series with other devices |
| Reverse Current (IR) | 50 nA max at VR = 0.7 × VZ; guarantees minimal leakage in standby or battery-powered modes |
| Package | SOT323 (SC-70); 1.3 mm × 1.8 mm footprint enables high-density placement on compact PCBs |
Pinout & Package
SOT323 (SC-70) surface-mount plastic package with 3 leads; leadless construction optimized for reflow soldering and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; forms current path into diode during Zener operation |
| 2 | Not Connected (n.c.) | Internally isolated terminal; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Connects to higher-potential node; serves as regulated output reference point in shunt regulator topologies |
Key Features
| Feature | Design Value |
|---|---|
| Wide Zener voltage range | 2.4 V to 75 V in E24 steps enables standardized BOM consolidation across multiple voltage rails |
| Low diode capacitance | 0.7 pF at 1 MHz/0 V allows integration into RF-coupled feedback paths without phase shift or bandwidth reduction |
| High surge capability | 40 W non-repetitive peak reverse power (100 µs pulse) supports transient overvoltage suppression in industrial I/O protection |
| Thermal resistance | 455 K/W junction-to-ambient (FR4, single-sided copper) informs derating curves for continuous operation above 70 °C ambient |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 16-bit ADC inputs in factory-floor temperature transmitters operating at 39 V supply rails. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, absorbing excess current to clamp input to precise 39 V level independent of load variation. Use Value: Enables ±0.5 % full-scale measurement accuracy by limiting reference drift to <±1.5 mV over −40 °C to +85 °C ambient range. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ MCU in battery-backed IoT edge node with 39 V backup supply. IC Role / Device Role / Timing Role: Functions as precision voltage monitor triggering POR circuitry when main supply drops below 37.05 V (−5 % tolerance limit). Use Value: Guarantees deterministic reset assertion with <10 µs latency and zero false triggers due to sub-50 nA leakage at standby. |
| DC-DC Converter Feedback Divider | ESD Protection Clamp for Analog Inputs |
|
Use Scenario: Setting output voltage of isolated flyback converter powering 39 V actuator driver stage in PLC output module. IC Role / Device Role / Timing Role: Replaces TL431 in secondary-side feedback loop to reduce component count and improve thermal robustness at elevated ambient. Use Value: Maintains ±1.2 % output regulation across 10–100 % load while eliminating optocoupler aging concerns in 15-year field deployments. |
Use Scenario: Protecting 39 V analog input channel of data acquisition system against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Acts as fast-acting crowbar device, clamping transients within 1 ns to limit voltage excursion to ≤42 V at protected node. Use Value: Achieves Class 4 immunity without external series resistance, preserving signal bandwidth up to 10 MHz due to 0.7 pF capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5242B | 39 V nominal, ±5 %, 350 Ω rdiff, but rated for only 225 mW Ptot and lacks SC-70 marking compatibility | Lower power handling limits use in sustained 39 V rail regulation; suitable only for intermittent clamping | Select when cost sensitivity outweighs thermal margin requirements and board space permits larger SOT23 footprint |
| Vishay BZX84-C39 | Same 39 V/±5 % spec, but in legacy SOT23 package with 300 mW rating and 1.5 pF capacitance - 2.1× higher than BZX84W-C39F | Higher capacitance degrades HF performance in RF-sensitive analog paths; larger footprint reduces layout density | Prefer for legacy designs requiring drop-in replacement without layout revision, accepting bandwidth trade-off |
Compared with MMBZ5242B and BZX84-C39, the BZX84W-C39F delivers superior thermal performance (275 mW vs. 225/300 mW), lowest capacitance (0.7 pF), and smallest footprint (SOT323), making it optimal for next-generation high-density, high-frequency, and thermally constrained applications.
Availability
BZX84W-C39F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller reset circuits, DC-DC converter feedback dividers, and ESD protection clamps requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-C39F 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 for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, thermally efficient voltage regulation and clamping in space-constrained SMT applications across industrial and computing systems.
FAQ
What is the maximum continuous reverse current the BZX84W-C39F can handle at 25 °C ambient?
The device supports up to 200 mA forward current, but for Zener operation, the maximum continuous reverse current is derived from its 275 mW power rating: IZmax = Ptot/VZ ≈ 275 mW / 39 V = 7.05 mA. This assumes no additional thermal derating and full copper heatsinking per datasheet test conditions.
Does the "F" suffix in BZX84W-C39F indicate a specific packaging or marking variant?
Yes - the "F" suffix denotes the standard SOT323 package with tape-and-reel delivery and industry-standard marking code U2%, as confirmed in Table 4 of the datasheet. It does not indicate automotive qualification, RoHS exemption, or special reliability screening.
Can BZX84W-C39F be used in series or parallel configurations for higher voltage or current capability?
No - Zener diodes exhibit manufacturing spread in VZ and temperature coefficient, causing current imbalance in parallel use. In series, mismatched characteristics lead to uneven voltage distribution. The datasheet specifies operation only as a single-element shunt regulator or clamp.
How does the 0.7 pF diode capacitance impact performance in high-speed analog signal paths?
At 1 MHz, 0.7 pF presents ~227 kΩ capacitive reactance, introducing negligible loading on 39 V reference nodes. In AC-coupled paths, it attenuates signals above 225 MHz by −3 dB, preserving integrity for most industrial analog interfaces including RS-485, CAN FD, and sensor bridge outputs.
BZX84W-C39F 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:
- ±5%
- 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-C39F FAQ
1.How can I place an order for BZX84W-C39F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C39F 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-C39F reliable?
The price and inventory of BZX84W-C39F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C39F is usually 5 days.
3.What payment methods are accepted for BZX84W-C39F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C39F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C39F?
BZX84W-C39F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C39F 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-C39F?
For technical support, including BZX84W-C39F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C39F requirements.
6.How does Aetrix verify that BZX84W-C39F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C39F 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-C39F meets industry standards.
7.What is the process for return or replacement of BZX84W-C39F?
All BZX84W-C39F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C39F, 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-C39F part is unused and in its original packaging.
Return procedure for BZX84W-C39F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C39F Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAZ12-13-F
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