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Nexperia USA Inc. PDZ3.9B-QZ
- Part No.:
- PDZ3.9B-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ3.9B-QZ.pdf
- Description:
- DIODE ZENER 3.9V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
PDZ3.9B-Q from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in surface-mounted applications. It provides a nominal working voltage of 3.9 V at 5 mA, with ±2 % tolerance, 500 Ω differential resistance at 1 mA, and 3 μA reverse current at 1 V. It operates in the SOD323 (SC-76) package and is qualified to AEC-Q101 for automotive use.
For engineers reviewing the PDZ3.9B-Q datasheet, PDZ3.9B-Q pinout, PDZ3.9B-Q application, or PDZ3.9B-Q equivalent, this device is selected for precision clamping, reference voltage generation, and overvoltage protection where tight voltage tolerance, low leakage, and automotive-grade reliability are required.
Technical Context
This Zener diode functions as a two-terminal voltage reference with hard breakdown knee and stable regulation at low currents (IZ = 0.5 mA to 5 mA). Its temperature coefficient is −2.5 mV/K at 5 mA, enabling predictable drift behavior in ambient temperature ranges up to +150 °C junction temperature.
Thermal performance is defined by Rth(j-sp) = 130 K/W (junction-to-solder point) and Rth(j-a) = 340 K/W (junction-to-ambient on FR4 PCB), supporting reliable operation under continuous 400 mW power dissipation at Tamb ≤ 25 °C with derating above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 3.89 V to 4.16 V at IZ = 5 mA - defines regulated output range for reference or clamp circuits |
| Differential Resistance (rdif) | 500 Ω at IZ = 1 mA - determines regulation stiffness and output impedance under light load |
| Reverse Current (IR) | 3 μA max at VR = 1 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (Ptot) | 400 mW at Tamb ≤ 25 °C - sets maximum continuous thermal load on standard FR4 PCB footprint |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - supports low-loss forward conduction during transient polarity reversal |
| Temperature Coefficient (SZ) | −2.5 mV/K at IZ = 5 mA - enables predictable VZ drift compensation in temperature-sensitive designs |
| Junction Temperature (Tj) | +150 °C max - allows operation in under-hood automotive environments without thermal shutdown |
Pinout & Package
The PDZ3.9B-Q is housed in a SOD323 (SC-76) plastic surface-mounted package measuring 1.8 mm × 1.35 mm × 0.95 mm, with gull-wing leads and cathode indicated by a marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker determines direction of Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-biased path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| ±2 % voltage tolerance | Reduces need for post-production trimming in precision reference circuits |
| Hard breakdown knee | Enables sharp transition into regulation, improving accuracy at low test currents (0.5–5 mA) |
| Low leakage (3 μA @ 1 V) | Minimizes error in high-resistance voltage divider networks used for sensing or biasing |
| SOD323 footprint compatibility | Supports automated placement and reflow soldering on space-constrained PCBs |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Reference Voltage |
|---|---|
Use Scenario: Protecting microcontroller I/O pins and analog front-ends from transients on 5 V supply rails in engine control modules. IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to shunt overvoltage spikes exceeding 4.16 V. Use Value: Prevents latch-up or damage using its hard breakdown knee and 400 mW surge capability without external series resistance. |
Use Scenario: Providing stable 3.9 V reference for 12-bit ADCs in temperature and pressure sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference sourcing <10 μA bias current to op-amp input stages. Use Value: Delivers ±2 % initial accuracy and −2.5 mV/K drift, enabling <0.5 % total error across −40 °C to +125 °C ambient. |
| USB Port Overvoltage Protection | Consumer Device Battery Monitoring |
Use Scenario: Safeguarding USB data lines and VBUS detection circuitry against ESD and hot-plug overshoot in portable chargers. IC Role / Device Role / Timing Role: Low-capacitance (370 pF) Zener placed across D+ and D− or VBUS and GND to clamp fast transients. Use Value: Limits voltage to ≤4.16 V within nanoseconds while maintaining signal integrity due to minimal parasitic capacitance. |
Use Scenario: Monitoring lithium-ion cell voltage via resistive divider in smart battery packs and wearables. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing divider ratio against supply variation and temperature drift. Use Value: Enables accurate state-of-charge estimation with <3 μA leakage, avoiding discharge-induced measurement offset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V9 | Same 3.9 V nominal, ±2 % tolerance, but SOD323 package with higher rdif (600 Ω @ 1 mA) and IR = 5 μA @ 1 V | Less suitable for ultra-low-leakage bias networks; acceptable for general-purpose clamping | Select when cost sensitivity outweighs leakage or regulation stiffness requirements |
| MMSZ4685 | 3.9 V nominal, ±5 % tolerance, SOD123 package, Ptot = 500 mW, rdif = 100 Ω @ 20 mA | Higher power rating but looser tolerance and larger footprint; not AEC-Q101 qualified | Prefer for non-automotive industrial designs requiring higher surge margin and relaxed accuracy |
Compared with BZX384-B3V9 and MMSZ4685, PDZ3.9B-Q offers tighter tolerance, lower leakage, and automotive qualification-making it optimal for safety-critical or high-accuracy reference roles where long-term stability and environmental robustness are mandatory.
Availability
PDZ3.9B-Q is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference design, and USB interface clamping requiring stable component supply across production lifecycles.
Supply support for PDZ3.9B-Q 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 specializing in high-performance, energy-efficient logic, discrete, and MOSFET devices, with manufacturing rooted in process innovation and automotive-grade reliability.
The PDZ-B-Q series belongs to Nexperia's automotive-qualified Zener portfolio, engineered specifically for precision voltage regulation in harsh-environment electronics where AEC-Q101 compliance and parametric consistency are essential.
FAQ
What is the maximum reverse voltage before breakdown for PDZ3.9B-Q?
The PDZ3.9B-Q exhibits a guaranteed breakdown range of 3.89 V to 4.16 V at IZ = 5 mA. Below 3.89 V, reverse current remains ≤3 μA at VR = 1 V; no specified absolute "maximum reverse voltage" exists outside this regulation band, as the device is intended for controlled Zener operation-not blocking.
Can PDZ3.9B-Q be used in series or parallel configurations?
Series connection is permissible for higher-voltage references, but mismatched temperature coefficients (−2.5 mV/K each) cause unequal voltage sharing. Parallel use is not recommended due to inherent VZ tolerances and thermal runaway risk-each diode must be individually biased to ensure stable current distribution.
Is the SOD323 footprint compatible with standard reflow profiles?
Yes-the PDZ3.9B-Q's SOD323 package is qualified for lead-free reflow per J-STD-020, with peak temperatures up to 260 °C. Recommended solder land dimensions are 0.6 mm × 0.5 mm per pad (reflow) or 1.2 mm × 0.5 mm (wave), matching IPC-7351B density level A.
How does PDZ3.9B-Q perform under temperature cycling?
As an AEC-Q101-qualified device, PDZ3.9B-Q undergoes 1000 cycles between −40 °C and +125 °C with no parameter shift beyond specification limits. Its −2.5 mV/K temperature coefficient is characterized from 25 °C to 150 °C, ensuring predictable VZ drift in thermal transients.
PDZ3.9B-QZ 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:
- Obsolete
- 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-QZ FAQ
1.How can I place an order for PDZ3.9B-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ3.9B-QZ 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-QZ reliable?
The price and inventory of PDZ3.9B-QZ 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-QZ is usually 5 days.
3.What payment methods are accepted for PDZ3.9B-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ3.9B-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ3.9B-QZ?
PDZ3.9B-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ3.9B-QZ 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-QZ?
For technical support, including PDZ3.9B-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ3.9B-QZ requirements.
6.How does Aetrix verify that PDZ3.9B-QZ is sourced from the original manufacturer or authorized distributors?
All PDZ3.9B-QZ 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-QZ meets industry standards.
7.What is the process for return or replacement of PDZ3.9B-QZ?
All PDZ3.9B-QZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ3.9B-QZ, 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-QZ part is unused and in its original packaging.
Return procedure for PDZ3.9B-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ3.9B-QZ 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
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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