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Nexperia USA Inc. PZU4.3BA,115
- Part No.:
- PZU4.3BA,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PZU4.3BA,115.pdf
- Description:
- DIODE ZENER 4.3V 320MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
PZU4.3BA,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 and digital circuits. It delivers a nominal Zener voltage of 4.3 V with ±5 % tolerance (Series B), differential resistance ≤90 Ω at IZ = 5 mA, reverse current ≤3 µA at VR = 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 PZU4.3BA,115 datasheet, PZU4.3BA,115 pinout, PZU4.3BA,115 application, or PZU4.3BA,115 equivalent, key selection criteria include Zener voltage accuracy, dynamic impedance at regulation current, thermal resistance (Rth(j-a) = 390 K/W), leakage performance at low reverse bias, and compatibility with reflow-soldered SMD layouts on FR4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and input conditions. Its hard breakdown knee and low leakage current support clean regulation in low-current (<10 mA) applications such as reference generation and signal clamping.
The device exhibits a negative temperature coefficient of −2.5 mV/K near 4.3 V, enabling predictable drift compensation in temperature-sensitive designs. Its 1.7 mm × 1.25 mm × 0.95 mm SOD323 footprint ensures minimal board space usage while maintaining adequate thermal dissipation for ≤320 mW continuous operation at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.3 V nominal, ±5 % tolerance - defines precise regulation point for feedback or clamp circuits |
| Differential Resistance rdif | ≤90 Ω at IZ = 5 mA - determines output impedance and regulation stability under load variation |
| Reverse Current IR | ≤3 µA at VR = 1 V - ensures minimal standby power loss in battery-powered systems |
| Total Power Dissipation Ptot | 320 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling capability |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 µs - supports transient surge suppression without failure |
| Junction Temperature Tj | −55 °C to +150 °C - enables operation in industrial and automotive-adjacent environments |
| Thermal Resistance Rth(j-a) | 390 K/W in free air - informs derating requirements for ambient temperature rise |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch. Cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; polarity must be observed for correct breakdown conduction |
| 2 | Anode | Connected to ground or lower-potential rail; completes reverse-bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables sharp, predictable turn-on for accurate voltage clamping without soft saturation |
| Very low leakage current | ≤3 µA at 1 V reverse bias reduces quiescent current in always-on monitoring circuits |
| Small SOD323 footprint | 1.7 mm × 1.25 mm area supports high-density PCB layouts in space-constrained modules |
| Low dynamic impedance | ≤90 Ω at 5 mA improves line and load regulation in feedback networks |
| FR4-compatible thermal design | Rated for 320 mW on standard single-sided tin-plated FR4 - no special heatsinking required |
Applications
| Power Supply Feedback | Sensor Biasing |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener diode provides reference voltage to optocoupler LED or TL431 control input. Use Value: Stable 4.3 V reference ensures consistent feedback threshold across temperature and line variations. |
Use Scenario: Providing precise bias voltage to analog sensors (e.g., RTDs, bridge transducers). IC Role / Device Role / Timing Role: Acts as low-drift voltage source for excitation or offset setting. Use Value: Low 3 µA leakage avoids loading sensitive sensor outputs; −2.5 mV/K TC allows predictable calibration compensation. |
| Overvoltage Clamp | Signal Level Shifting |
|
Use Scenario: Protecting microcontroller I/O pins from ESD or supply rail overshoot. IC Role / Device Role / Timing Role: Clamps transient voltages above 4.3 V to safe levels before reaching downstream logic. Use Value: 40 W non-repetitive surge rating absorbs short-duration spikes without degradation. |
Use Scenario: Translating logic-level signals between 5 V and 3.3 V domains using passive level-shifter topology. IC Role / Device Role / Timing Role: Sets clamping threshold to define high-level voltage at receiver input. Use Value: Sharp knee and low rdif ensure fast, repeatable switching edge definition without signal distortion. |
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 4.3 V ±5 %, but higher typical rdif (120 Ω vs. 90 Ω); slightly higher IR (5 µA vs. 3 µA) | Less stable regulation under dynamic load; marginally higher standby current | Acceptable where cost sensitivity outweighs regulation precision |
| MMSZ4V3T1G | 4.3 V ±5 %, but SOD-123 package (larger footprint); rdif = 90 Ω, IR = 5 µA at 1 V | Requires more PCB area; identical electrical performance except for thermal resistance (320 K/W vs. 390 K/W) | Preferred when higher power derating margin is needed or legacy layout reuse is required |
Compared with PZU4.3BA,115, BZX384-B4V3,115 trades regulation stability for cost, while MMSZ4V3T1G offers better thermal margin at the expense of board space - making PZU4.3BA,115 optimal for compact, precision-regulated low-power nodes.
Availability
PZU4.3BA,115 is available at Aetrix Electronics and suitable for power supply feedback, sensor biasing, overvoltage clamping, and signal level shifting requiring stable component supply across industrial, instrumentation, and consumer electronics programs.
Supply support for PZU4.3BA,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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in advanced packaging and automotive-qualified components.
The PZUxBA series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained, cost-sensitive SMD applications.
FAQ
What is the Zener voltage tolerance for PZU4.3BA,115?
The 'B' suffix indicates ±5 % tolerance, meaning the measured Zener voltage at IZ = 5 mA falls between 4.085 V and 4.515 V at Tj = 25 °C. This is confirmed in Table 8 of the datasheet under "PZU4.3BA" row with "B" tolerance series.
Can PZU4.3BA,115 be used in place of a 3.3 V Zener diode?
No - PZU4.3BA,115 is specified only for 4.3 V nominal regulation. Substituting it for a 3.3 V device would result in incorrect circuit biasing or clamping thresholds. The PZU3.3BA,115 variant exists in the same series for that voltage.
What is the maximum continuous forward current rating?
The absolute maximum forward current is 200 mA per Table 5 (Limiting Values). However, forward conduction is not its intended operating mode; sustained forward bias exceeds design intent and risks thermal overstress without functional benefit.
Does PZU4.3BA,115 require a series resistor in regulation applications?
Yes - a current-limiting resistor is mandatory to set the Zener operating current within 1 mA to 20 mA range. Without it, excessive current causes thermal runaway. Typical designs use resistor values calculated from (VIN − 4.3 V)/IZ, where IZ is selected based on desired regulation stability and power dissipation.
PZU4.3BA,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):
- 4.3 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
PZU4.3BA,115 FAQ
1.How can I place an order for PZU4.3BA,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU4.3BA,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 PZU4.3BA,115 reliable?
The price and inventory of PZU4.3BA,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU4.3BA,115 is usually 5 days.
3.What payment methods are accepted for PZU4.3BA,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU4.3BA,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU4.3BA,115?
PZU4.3BA,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU4.3BA,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 PZU4.3BA,115?
For technical support, including PZU4.3BA,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU4.3BA,115 requirements.
6.How does Aetrix verify that PZU4.3BA,115 is sourced from the original manufacturer or authorized distributors?
All PZU4.3BA,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 PZU4.3BA,115 meets industry standards.
7.What is the process for return or replacement of PZU4.3BA,115?
All PZU4.3BA,115 units undergo pre-shipment inspection (PSI). If there is an issue with PZU4.3BA,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 PZU4.3BA,115 part is unused and in its original packaging.
Return procedure for PZU4.3BA,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU4.3BA,115 Tags
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