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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. PZU3.9BA,115

Name: PZU3.9BA,115
Brand: Nexperia USA Inc.
SKU: PZU3.9BA,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU3.9BA,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: PZU3.9BA,115.pdf

Description:: DIODE ZENER 3.9V 320MW SOD323

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Inventory:5,645

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Product details

Overview

PZU3.9BA,115 from Nexperia is a general-purpose Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and overvoltage protection in low-power analog circuits. It delivers a nominal Zener voltage of 3.9 V with ±5 % tolerance (Series B), differential resistance ≤90 Ω at I_Z = 5 mA, reverse current ≤3 µA at V_R = 1 V, and operates up to 150 °C junction temperature - commonly used in power supply feedback loops and sensor biasing networks.

For engineers reviewing the PZU3.9BA,115 datasheet, PZU3.9BA,115 pinout, PZU3.9BA,115 application, or PZU3.9BA,115 equivalent, key selection criteria include Zener voltage accuracy, low dynamic impedance at regulation current, thermal resistance (R_th(j-a) = 390 K/W), cathode/anode polarity marking, and compatibility with reflow-soldered SMD layouts on FR4 PCBs.

Technical Context

This device functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current when applied voltage exceeds its 3.9 V Zener threshold. Its hard breakdown knee and low leakage support clean regulation in low-current (<10 mA) reference paths.

Designed for surface-mount use, it relies on thermal conduction through the cathode pad (R_th(j-sp) = 55 K/W) and exhibits a negative temperature coefficient of −2.5 mV/K near 3.9 V, enabling predictable drift compensation in temperature-sensitive designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	3.9 V nominal, ±5 % tolerance - defines precise clamping level for 3.3 V or 5 V rail monitoring
Differential Resistance r_dif	≤90 Ω at I_Z = 5 mA - ensures minimal voltage shift under load variation in reference circuits
Reverse Current I_R	≤3 µA at V_R = 1 V - guarantees low standby power loss in always-on protection nodes
Total Power Dissipation P_tot	320 mW at T_amb ≤ 25 °C on FR4 PCB - sets maximum continuous regulation power without heatsinking
Non-repetitive Peak Power P_ZSM	40 W for t_p = 100 µs - enables transient surge suppression in ESD-coupled signal lines
Junction Temperature T_j	−55 °C to +150 °C - supports operation in industrial and automotive under-hood ambient conditions
Package	SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm - compatible with standard 0805 footprint and automated pick-and-place

Pinout & Package

SOD323 (SC-76) plastic surface-mount package with molded body, tin-plated terminations, and cathode marked by a bar on the top surface. Dimensions: 1.7 mm × 1.25 mm × 0.95 mm; lead pitch: 1.3 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode	Connected to regulated output node; carries reverse current during Zener conduction; marked by bar on package
2	Anode	Connected to ground or lower-potential rail; completes shunt path for voltage stabilization

Key Features

Feature	Design Value
Hard breakdown knee	Enables sharp, predictable turn-on at 3.9 V - critical for accurate overvoltage detection in LDO feedback
Low dynamic impedance	≤90 Ω at 5 mA - minimizes output voltage deviation across ±1 mA load changes in reference buffers
Very low leakage	≤3 µA at 1 V reverse bias - preserves battery life in always-connected IoT sensor nodes
Thermal robustness	150 °C max junction temperature - allows placement near heat-generating ICs without derating
Standardized SMD footprint	SOD323 outline with 1.3 mm pitch - ensures drop-in replacement and compatibility with IPC-7351B land patterns

Applications

Power Supply Feedback

Sensor Bias Reference

Use Scenario: Stabilizing feedback voltage in adjustable DC-DC converter output stage.

IC Role / Device Role / Timing Role: Shunt regulator providing precise 3.9 V reference to error amplifier input.

Use Value: Enables ±1 % output voltage accuracy despite input ripple and load transients due to low r_dif and hard knee.

Use Scenario: Supplying stable bias voltage to analog temperature or pressure sensors.

IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-cost bandgap sources in cost-sensitive modules.

Use Value: Delivers <3 µA leakage and −2.5 mV/K tempco - sufficient for 12-bit ADC linearity in 0–70 °C industrial ranges.

Overvoltage Clamp

ESD Protection Node

Use Scenario: Protecting microcontroller I/O pins from accidental 5 V exposure on 3.3 V logic lines.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 3.9 V + forward drop during fault.

Use Value: Withstands 40 W non-repetitive surges (100 µs), absorbing >1 A transient current without failure.

Use Scenario: Secondary-level ESD suppression on USB or UART signal lines before TVS diodes.

IC Role / Device Role / Timing Role: Low-capacitance (370 pF) Zener absorbing slow-rising overvoltages missed by fast TVS devices.

Use Value: Complements primary TVS by handling longer-duration transients while adding <1 nA leakage at standby.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B3V9	Same 3.9 V ±5 %, SOD323, but higher r_dif (100 Ω) and higher I_R (5 µA at 1 V)	Less stable under varying load; marginally higher power loss in battery-powered nodes	Acceptable where cost is prioritized over regulation tightness and leakage
MMSZ4685	3.9 V ±5 %, SOD123 package (larger, 2.7 mm × 1.6 mm); r_dif = 90 Ω, I_R = 2 µA at 1 V	Requires larger PCB area; better thermal dissipation (P_tot = 500 mW) but incompatible with dense SOD323 layouts	Preferred for high-reliability industrial designs needing higher power margin and proven field history

Compared with BZX384-B3V9, PZU3.9BA,115 offers tighter regulation stability and lower leakage; compared with MMSZ4685, it saves board space and suits miniaturized wearables, though with lower absolute power handling.

Availability

PZU3.9BA,115 is available at Aetrix Electronics and suitable for power supply feedback, sensor biasing, overvoltage clamping, and ESD protection nodes requiring stable component supply across high-mix production runs.

Supply support for PZU3.9BA,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 discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

PZUxBA series belongs to Nexperia's general-purpose Zener diode product line, engineered for cost-effective, space-constrained voltage regulation and protection in consumer, industrial, and computing applications.

FAQ

What is the maximum continuous reverse current for PZU3.9BA,115 at 25 °C ambient?

The device supports up to 200 mA forward current, but as a Zener regulator, its continuous reverse current is limited by power dissipation. At 25 °C ambient on an FR4 PCB, P_tot = 320 mW implies I_Z ≤ 82 mA (320 mW ÷ 3.9 V) for sustained operation without exceeding thermal limits.

How does the cathode marking appear on the SOD323 package?

The cathode is indicated by a distinct bar printed on the top surface of the SOD323 package, aligned with Pin 1 per Table 2 and Figure 9. This marking is visible under 10× magnification and matches the "A" suffix designation in the type number (PZU3.9BA).

Can PZU3.9BA,115 be used in place of a 3.3 V Zener for 3.3 V rail monitoring?

No - its nominal Zener voltage is 3.9 V, not 3.3 V. Using it on a 3.3 V rail would prevent conduction, rendering it ineffective as a clamp or reference. For 3.3 V regulation, PZU3.3BA (3.3 V ±5 %) is the functionally matched variant in the same series.

Is PZU3.9BA,115 qualified for automotive applications?

No - this part is not AEC-Q200 qualified. The datasheet explicitly states "non-automotive qualified products" in Section 14, and no automotive stress test data or qualification records are included. Use only in commercial or industrial environments unless independently validated.

PZU3.9BA,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.9 V

Tolerance:: ±5%

Power - Max:: 320 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 100 mA

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

PZU3.9BA,115 FAQ

1.How can I place an order for PZU3.9BA,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU3.9BA,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 PZU3.9BA,115 reliable?

The price and inventory of PZU3.9BA,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU3.9BA,115 is usually 5 days.

3.What payment methods are accepted for PZU3.9BA,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU3.9BA,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU3.9BA,115?

PZU3.9BA,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU3.9BA,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 PZU3.9BA,115?

For technical support, including PZU3.9BA,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU3.9BA,115 requirements.

6.How does Aetrix verify that PZU3.9BA,115 is sourced from the original manufacturer or authorized distributors?

All PZU3.9BA,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 PZU3.9BA,115 meets industry standards.

7.What is the process for return or replacement of PZU3.9BA,115?

All PZU3.9BA,115 units undergo pre-shipment inspection (PSI). If there is an issue with PZU3.9BA,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 PZU3.9BA,115 part is unused and in its original packaging.

Return procedure for PZU3.9BA,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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