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Nexperia USA Inc. PZU4.3B3A,115
- Part No.:
- PZU4.3B3A,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PZU4.3B3A,115.pdf
- Description:
- DIODE ZENER 4.3V 320MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,289
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Product details
Overview
PZU4.3B3A,115 from Nexperia is a precision Zener voltage regulator diode in SOD323 (SC-76) package, designed for low-power voltage reference and regulation in space-constrained PCBs. It delivers 4.3 V nominal Zener voltage with ±2 % tolerance (B3 series), 90 Ω maximum differential resistance at IZ = 5 mA, 3 µA max reverse current at IZ = 0.5 mA, and operates up to 150 °C junction temperature - used in power supply feedback loops and analog sensor biasing.
For engineers reviewing the PZU4.3B3A,115 datasheet, PZU4.3B3A,115 pinout, PZU4.3B3A,115 application, or PZU4.3B3A,115 equivalent, key selection criteria include Zener voltage accuracy, dynamic impedance at low test currents, thermal resistance to solder point (55 K/W), and compatibility with reflow/wave soldering footprints per JEDEC MO-203AA.
Technical Context
This device functions as a two-terminal shunt voltage reference, maintaining stable output by conducting reverse current when applied voltage exceeds its 4.3 V breakdown threshold. Its hard breakdown knee and low leakage support precise regulation in low-current (<10 mA) bias networks.
Thermal design relies on its 55 K/W junction-to-solder-point resistance and 255 K/W junction-to-ambient (on 1 cm² cathode pad), enabling reliable operation without heatsinking in ambient temperatures from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.28 V to 4.48 V at IZ = 5 mA - ensures ±2 % regulation accuracy under standard test conditions |
| Differential Resistance rdif | ≤90 Ω at IZ = 5 mA - minimizes output voltage shift under load current variation |
| Reverse Current IR | ≤3 µA at VR = 1 V - enables low-power standby operation with negligible quiescent drain |
| Total Power Dissipation Ptot | 320 mW at Tamb ≤ 25 °C on FR4 PCB - defines maximum continuous DC power handling in standard layout |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 µs - supports transient overvoltage clamping in surge protection circuits |
| Junction Temperature Tj | −55 °C to +150 °C - allows deployment in industrial and automotive under-hood environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch and cathode-marked top-side bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode | Connected to ground or lower-potential rail; completes shunt path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance (B3 series) | Enables tighter closed-loop regulation vs. ±5 % (B) variants, reducing need for post-calibration trimming |
| Hard breakdown knee | Ensures sharp, predictable turn-on at 4.3 V - critical for accurate voltage sensing in ADC reference buffers |
| Low dynamic impedance at low currents | 90 Ω at 5 mA supports stable regulation even in microamp-level bias networks (e.g., op-amp input stages) |
| Optimized leakage profile | 3 µA max IR at 0.5 mA enables use in battery-powered systems where standby current must stay below 10 µA |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
Use Scenario: Stabilizing output voltage of isolated flyback or buck converter via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 4.3 V threshold to TL431-like control IC or comparator input. Use Value: Maintains ±1 % output regulation across line/load/temperature with no external trim components. |
Use Scenario: Supplying stable bias voltage to MEMS pressure sensor or RTD front-end amplifier. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference replacing higher-cost bandgap ICs in analog signal chains. Use Value: Delivers <10 ppm/°C effective tempco when paired with matched resistors, reducing calibration burden. |
| Overvoltage Clamp | ADC Input Protection |
Use Scenario: Protecting 5 V logic inputs against ESD or inductive kickback transients. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing 40 W surges for 100 µs without degradation. Use Value: Limits voltage to ≤4.8 V during transients, preventing latch-up in downstream CMOS inputs. |
Use Scenario: Preventing damage to SAR ADC input pins during hot-plug or fault events. IC Role / Device Role / Timing Role: Low-capacitance (350 pF) shunt limiter placed before RC anti-alias filter. Use Value: Clamps overshoot to 4.3 V while adding <0.1 % gain error to full-scale measurement range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3,115 | Same SOD323 package, ±2 % tolerance, but 100 Ω rdif and 5 µA IR at 0.5 mA | Higher dynamic impedance reduces regulation stability in low-current feedback paths | Acceptable where cost sensitivity outweighs 0.5 % output drift tolerance |
| MMSZ4685T1G | SOD-123 package (larger footprint), ±5 % tolerance, 100 Ω rdif, 100 nA IR at 1 V | Lower leakage supports ultra-low-power sleep modes but looser voltage accuracy limits precision use | Preferred for battery-backed real-time clocks where leakage dominates over regulation tightness |
Compared with PZU4.3B3A,115, BZX384-B4V3,115 trades tighter thermal resistance (255 K/W vs. 255 K/W) for higher impedance, while MMSZ4685T1G sacrifices board area efficiency and voltage accuracy to achieve sub-µA leakage - making PZU4.3B3A,115 optimal for compact, precision-regulated analog subsystems.
Availability
PZU4.3B3A,115 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded ADC protection circuits requiring stable component supply and consistent parametric performance across production lots.
Supply support for PZU4.3B3A,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, headquartered in Nijmegen, Netherlands.
The PZUxBA series targets cost-sensitive, space-constrained voltage regulation in consumer, industrial, and computing applications - emphasizing manufacturability, solderability, and parametric consistency across wafer lots.
FAQ
What is the maximum continuous reverse current the PZU4.3B3A,115 can sustain without exceeding its 320 mW power limit?
At 4.3 V Zener voltage, the absolute maximum continuous reverse current is 74 mA (320 mW ÷ 4.3 V), assuming ambient temperature ≤25 °C and standard FR4 PCB mounting. Derating applies above 25 °C per the 255 K/W thermal resistance specification.
Does the PZU4.3B3A,115 require a series resistor in all applications, and how is its value determined?
Yes - a series current-limiting resistor is mandatory to prevent thermal runaway. Value is calculated as R = (VIN − 4.3 V) / IZ, where IZ is selected between 1 mA (for minimal power) and 20 mA (for lowest rdif); typical designs use 5–10 mA for optimal stability vs. power trade-off.
How does the temperature coefficient of −2.5 mV/K affect regulation accuracy over −40 °C to +85 °C ambient?
Across that range, junction temperature rise adds ~125 K, causing a total VZ shift of −0.31 V (−2.5 mV/K × 125 K). Combined with ±2 % initial tolerance, worst-case regulation spans 3.97 V to 4.59 V - acceptable for non-critical biasing but insufficient for metrology-grade references.
Can the PZU4.3B3A,115 be used in parallel to increase power handling or improve regulation?
No - Zener diodes cannot be reliably paralleled due to mismatched breakdown voltages causing current hogging. For higher power, use a single higher-rated device (e.g., PZU5.1B3A,115 with 400 mW rating) or add an external pass transistor in series configuration.
PZU4.3B3A,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- 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
PZU4.3B3A,115 FAQ
1.How can I place an order for PZU4.3B3A,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU4.3B3A,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 PZU4.3B3A,115 reliable?
The price and inventory of PZU4.3B3A,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU4.3B3A,115 is usually 5 days.
3.What payment methods are accepted for PZU4.3B3A,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU4.3B3A,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU4.3B3A,115?
PZU4.3B3A,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU4.3B3A,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 PZU4.3B3A,115?
For technical support, including PZU4.3B3A,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU4.3B3A,115 requirements.
6.How does Aetrix verify that PZU4.3B3A,115 is sourced from the original manufacturer or authorized distributors?
All PZU4.3B3A,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 PZU4.3B3A,115 meets industry standards.
7.What is the process for return or replacement of PZU4.3B3A,115?
All PZU4.3B3A,115 units undergo pre-shipment inspection (PSI). If there is an issue with PZU4.3B3A,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 PZU4.3B3A,115 part is unused and in its original packaging.
Return procedure for PZU4.3B3A,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU4.3B3A,115 Tags
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