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Nexperia USA Inc. PDZ3.9B-QX
- Part No.:
- PDZ3.9B-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ3.9B-QX.pdf
- Description:
- DIODE ZENER 3.9V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
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Product details
Overview
PDZ3.9B-QX from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in surface-mounted applications. It provides a nominal 3.9 V Zener voltage at 5 mA, with ±2 % tolerance, 500 Ω dynamic impedance at 1 mA, and 3 μA reverse leakage at 1 V. It operates in automotive-grade SOD323 (SC-76) package and is AEC-Q101 qualified for use in engine control modules and body electronics.
For engineers reviewing the PDZ3.9B-QX datasheet, PDZ3.9B-QX pinout, PDZ3.9B-QX application, or PDZ3.9B-QX equivalent, key selection criteria include Zener voltage accuracy at low test current, thermal resistance to solder point (130 K/W), cathode-marked polarity, and compliance with automotive reliability standards-not generic voltage reference use cases.
Technical Context
This Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current above its breakdown threshold. Its hard breakdown knee and low leakage (3 μA at VR = 1 V) enable precise clamping in low-current bias networks and feedback paths.
Designed for operation up to 150 °C junction temperature and rated for 400 mW total power dissipation on FR4 PCB, it uses silicon PN-junction physics with a −2.5 mV/K temperature coefficient at 5 mA-enabling predictable drift compensation in temperature-sensitive analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.89 V to 4.16 V at IZ = 5 mA - defines regulated output range under standard test condition |
| Dynamic Impedance (rdif) | 500 Ω at IZ = 1 mA - determines voltage regulation stiffness under light load |
| Reverse Leakage (IR) | 3 μA at VR = 1 V - ensures minimal parasitic current draw in standby or high-impedance nodes |
| Power Dissipation (Ptot) | 400 mW at Tamb ≤ 25 °C - sets maximum continuous DC or pulsed power handling on standard FR4 |
| Thermal Resistance (Rth(j-sp)) | 130 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
| Temperature Coefficient (SZ) | −2.5 mV/K at IZ = 5 mA - enables predictable voltage drift correction across operating temperature range |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - defines forward conduction drop when used in dual-direction protection or clamp configurations |
Pinout & Package
PDZ3.9B-QX is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode indicated by a marking bar on the device top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased terminal during Zener operation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and lighting modules |
| Hard breakdown knee | Enables sharp, repeatable turn-on behavior critical for precision voltage clamping |
| Low leakage at low reverse voltage | 3 μA at 1 V supports high-impedance sensing and battery-backed circuit integrity |
| Small SOD323 footprint | Reduces PCB area by >50% vs. DO-35; compatible with automated reflow and wave soldering |
| ±2 % VZ tolerance | Minimizes binning requirements and simplifies BOM management in production |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC input scaling in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.9 V bias for op-amp gain-setting network. Use Value: ±2 % VZ tolerance and −2.5 mV/K tempco allow <±10 mV drift over −40 °C to +125 °C ambient. |
Use Scenario: Clamping transient overvoltage on 4–20 mA loop transmitter output stage. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as fast-acting overvoltage limiter protecting downstream DAC and isolator inputs. Use Value: 500 Ω rdif at 1 mA ensures <0.5 V overshoot during 100 ns transients per IEC 61000-4-5 Level 3. |
| Consumer Power Adapter Feedback | Medical Wearable Battery Monitoring |
Use Scenario: Providing secondary-side voltage reference for optocoupler feedback in isolated AC/DC adapters. IC Role / Device Role / Timing Role: Zener diode establishing fixed 3.9 V threshold for TL431 reference comparator input. Use Value: 400 mW Ptot rating supports continuous operation at 5 mA without derating below 85 °C ambient. |
Use Scenario: Biasing voltage divider for lithium-ion cell voltage measurement in compact wearable health monitors. IC Role / Device Role / Timing Role: Low-leakage (3 μA) shunt regulator stabilizing ADC reference rail during sleep-mode operation. Use Value: Sub-μA standby current contribution preserves battery life over multi-week monitoring cycles. |
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 nominal VZ, but ±5 % tolerance and higher 10 μA leakage at 1 V | Not AEC-Q101 qualified; limited to commercial-grade consumer power supplies | Select when cost sensitivity outweighs automotive qualification and leakage budget |
| MMSZ4685 | 3.9 V nominal VZ with ±5 % tolerance, 100 Ω rdif at 5 mA, and 500 mW Ptot | Higher power rating but larger SOD-123 package; no AEC-Q101 documentation | Choose when lower dynamic impedance is prioritized and board space allows larger footprint |
Compared with BZX384-B3V9 and MMSZ4685, PDZ3.9B-QX delivers tighter voltage tolerance, lower leakage, and verified automotive qualification in the smallest SOD323 package-making it optimal for space-constrained, safety-relevant designs where regulation stability and reliability are non-negotiable.
Availability
PDZ3.9B-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapter feedback loops, and medical wearable battery monitoring systems requiring stable component supply and long-term lifecycle assurance.
Supply support for PDZ3.9B-QX 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 components and advanced packaging.
The PDZ-B-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation in harsh-environment automotive and industrial control applications.
FAQ
What is the maximum continuous reverse current this Zener can handle at 3.9 V?
The PDZ3.9B-QX is not rated for continuous reverse current at its Zener voltage. Its specified Zener test current is 5 mA, and maximum continuous power dissipation is 400 mW. At 3.9 V, that corresponds to ~102 mA absolute maximum-however, thermal limits and derating curves require operation well below that level on standard FR4 PCBs. Real-world design should limit IZ to ≤20 mA for reliable long-term performance.
Does the marking 'Z5' on the device body correspond to PDZ3.9B-QX?
Yes. According to Nexperia's official marking table, PDZ3.9B-QX is marked with the code 'Z5' on the top surface of the SOD323 package. The marking bar adjacent to the 'Z5' identifies Pin 1 as the cathode, consistent with Table 2 in the datasheet.
Can this Zener be used in bidirectional ESD protection configurations?
No. PDZ3.9B-QX is a unidirectional Zener diode optimized for reverse-bias regulation only. Its forward voltage is 0.9 V at 10 mA, but it lacks symmetric breakdown characteristics or specified ESD ratings (e.g., IEC 61000-4-2). For bidirectional protection, purpose-built TVS diodes like PESD5V0S1BA should be used instead.
How does the −2.5 mV/K temperature coefficient affect regulation accuracy over temperature?
At a nominal 3.9 V Zener voltage, the −2.5 mV/K coefficient causes approximately −0.25 V drift over a 100 K rise (e.g., −40 °C to +60 °C). This is predictable and linear, enabling system-level compensation in firmware or analog design. It reflects inherent silicon physics-not instability-and is fully characterized in the datasheet's Fig. 3.
PDZ3.9B-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 400 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:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ3.9B-QX FAQ
1.How can I place an order for PDZ3.9B-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ3.9B-QX 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 PDZ3.9B-QX reliable?
The price and inventory of PDZ3.9B-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ3.9B-QX is usually 5 days.
3.What payment methods are accepted for PDZ3.9B-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ3.9B-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ3.9B-QX?
PDZ3.9B-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ3.9B-QX 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 PDZ3.9B-QX?
For technical support, including PDZ3.9B-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ3.9B-QX requirements.
6.How does Aetrix verify that PDZ3.9B-QX is sourced from the original manufacturer or authorized distributors?
All PDZ3.9B-QX 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 PDZ3.9B-QX meets industry standards.
7.What is the process for return or replacement of PDZ3.9B-QX?
All PDZ3.9B-QX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ3.9B-QX, 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 PDZ3.9B-QX part is unused and in its original packaging.
Return procedure for PDZ3.9B-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ3.9B-QX 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
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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