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Nexperia USA Inc. PDZ3.9BZ
- Part No.:
- PDZ3.9BZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ3.9BZ.pdf
- Description:
- DIODE ZENER 3.9V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,408
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Product details
Overview
PDZ3.9BZ from Nexperia is a single low-power Zener diode in SOD323 (SC-76) package, designed for precision voltage regulation at 3.9 V nominal working voltage with ±2 % tolerance, 500 Ω differential resistance at 1 mA, and 3 μA reverse current at 1 V. It delivers stable clamping in low-current bias networks and reference circuits for portable power management and signal conditioning.
For engineers reviewing the PDZ3.9BZ datasheet, PDZ3.9BZ pinout, PDZ3.9BZ application, or PDZ3.9BZ equivalent, this device is selected for compact, low-leakage voltage references where thermal stability (−2.5 mV/K), hard breakdown knee, and surface-mount compatibility are critical in space-constrained PCB designs.
Technical Context
The PDZ3.9BZ operates as a two-terminal shunt regulator, maintaining a stable 3.89–4.16 V reverse breakdown voltage at IZ = 5 mA. Its low dynamic impedance (500 Ω @ 1 mA) ensures minimal output variation under load transients, while its −2.5 mV/K temperature coefficient enables predictable drift compensation in ambient-temperature-varying circuits.
Designed for FR4 PCB mounting with standard SOD323 footprint, it sustains 400 mW total power dissipation at Tamb ≤ 25 °C and derates linearly above that point. Junction-to-solder-point thermal resistance is 130 K/W, supporting reliable operation in thermally isolated layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 3.89–4.16 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V system rail stabilization |
| Differential Resistance (rdif) | 500 Ω @ 1 mA - ensures <1 mV output shift per 2 μA current change in reference bias networks |
| Reverse Current (IR) | 3 μA max @ VR = 1 V - minimizes quiescent power loss in battery-powered voltage monitors |
| Forward Voltage (VF) | 0.9 V @ IF = 10 mA - supports use as polarity indicator or low-drop rectifier in dual-function circuits |
| Power Dissipation (Ptot) | 400 mW @ Tamb ≤ 25 °C - enables continuous regulation in compact SMD layouts without forced cooling |
| Temperature Coefficient (SZ) | −2.5 mV/K @ IZ = 5 mA - allows predictable offset correction in temperature-compensated sensor interfaces |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 2-pin, ultra-compact (1.35 × 1.75 mm), cathode-marked with bar on top surface, optimized for reflow soldering with standardized footprint per Figure 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased terminal where voltage is stabilized |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Sharp, non-gradual transition into conduction improves regulation accuracy at low currents |
| Low leakage current | 3 μA max at 1 V reverse bias reduces standby power in always-on monitoring circuits |
| Small SOD323 footprint | 1.35 × 1.75 mm outline enables placement in high-density routing zones near IC power pins |
| ±2 % voltage tolerance | Tight initial calibration eliminates need for post-layout trimming in cost-sensitive consumer designs |
Applications
| Portable Power Supervision | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage in wearables using a microcontroller ADC with internal 1.1 V reference. IC Role / Device Role / Timing Role: Zener provides stable 3.9 V reference for resistive divider scaling battery voltage to ADC input range. Use Value: Enables ±1.5 % battery SOC estimation accuracy across −20 to +60 °C due to predictable −2.5 mV/K drift. |
Use Scenario: Biasing analog front-end of a 12-bit SAR ADC in industrial sensor nodes. IC Role / Device Role / Timing Role: Shunt regulator establishes clean 3.9 V reference for op-amp gain-setting network. Use Value: 500 Ω rdif limits reference noise contribution to <30 μV RMS, preserving ENOB > 11.2 bits. |
| ESD-Protected Signal Clamping | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Protecting UART TX line against ±8 kV HBM ESD events in medical handheld devices. IC Role / Device Role / Timing Role: Zener placed between signal and ground to clamp transients above 3.9 V. Use Value: 3 μA leakage avoids signal distortion at 1 Mbps data rates; 8 A non-repetitive surge rating absorbs pulse energy. |
Use Scenario: Generating clean reset pulse for ARM Cortex-M0+ MCU during brown-out conditions. IC Role / Device Role / Timing Role: Zener regulates voltage across RC timing network feeding reset supervisor IC. Use Value: ±2 % VZ tolerance ensures reset assertion within 2.9–3.1 V window, meeting MCU spec across temperature. |
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, but ±5 % tolerance and higher 10 μA leakage at 1 V | Less suitable for precision references; acceptable for basic overvoltage clamping | Select when cost priority outweighs regulation accuracy and leakage sensitivity |
| MMSZ4685 | 3.9 V nominal, ±5 % tolerance, 100 Ω rdif @ 5 mA, but 100 μA leakage at 1 V | Better dynamic response but significantly higher standby current | Prefer only in high-speed transient suppression where low rdif dominates over leakage |
Compared with BZX384-B3V9 and MMSZ4685, PDZ3.9BZ offers the tightest voltage tolerance and lowest leakage in the SOD323 form factor-making it optimal for battery-critical and precision analog applications where long-term stability and minimal quiescent drain are mandatory.
Availability
PDZ3.9BZ is available at Aetrix Electronics and suitable for portable power supervision, ADC reference stabilization, ESD-protected signal clamping, and low-power microcontroller reset circuits requiring stable component supply and consistent parametric performance across production batches.
Supply support for PDZ3.9BZ 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, headquartered in Nijmegen, Netherlands.
The PDZ-B series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, low-leakage voltage regulation in consumer, computing, and industrial SMD applications demanding tight tolerances and robust thermal behavior.
FAQ
What is the maximum reverse voltage before breakdown for PDZ3.9BZ?
The PDZ3.9BZ exhibits a guaranteed reverse breakdown voltage range of 3.89 V to 4.16 V at 5 mA test current. It does not conduct significantly below 3.89 V, and full regulation begins within this band. The device is not rated for sustained operation above 4.16 V in reverse bias without exceeding specified power limits.
Can PDZ3.9BZ be used in series or parallel configurations?
PDZ3.9BZ is not recommended for parallel connection due to mismatched Zener voltages causing current hogging. In series, it can achieve higher composite clamping voltages, but thermal coupling must be ensured to prevent runaway-each diode requires individual current limiting and derating per its 400 mW Ptot limit.
How does ambient temperature affect PDZ3.9BZ's regulation voltage?
PDZ3.9BZ has a temperature coefficient of −2.5 mV/K at 5 mA, meaning its Zener voltage decreases by approximately 2.5 mV per Kelvin rise in junction temperature. At 85 °C ambient (assuming ~30 K rise), VZ drops ~75 mV from its 25 °C value-within the 3.89–4.16 V band but requiring layout-aware thermal design.
Is PDZ3.9BZ suitable for automotive applications?
No. PDZ3.9BZ is not AEC-Q200 qualified and lacks automotive-grade screening, extended temperature validation, or failure rate documentation. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in commercial or industrial environments where ambient operating temperature remains within −65 °C to +150 °C and no safety-critical function is assigned.
PDZ3.9BZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- 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):
- 500 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ3.9BZ FAQ
1.How can I place an order for PDZ3.9BZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ3.9BZ 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 PDZ3.9BZ reliable?
The price and inventory of PDZ3.9BZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ3.9BZ is usually 5 days.
3.What payment methods are accepted for PDZ3.9BZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ3.9BZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ3.9BZ?
PDZ3.9BZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ3.9BZ 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 PDZ3.9BZ?
For technical support, including PDZ3.9BZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ3.9BZ requirements.
6.How does Aetrix verify that PDZ3.9BZ is sourced from the original manufacturer or authorized distributors?
All PDZ3.9BZ 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 PDZ3.9BZ meets industry standards.
7.What is the process for return or replacement of PDZ3.9BZ?
All PDZ3.9BZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ3.9BZ, 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 PDZ3.9BZ part is unused and in its original packaging.
Return procedure for PDZ3.9BZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ3.9BZ Tags
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