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Nexperia USA Inc. PZU4.3B1A,115
- Part No.:
- PZU4.3B1A,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PZU4.3B1A,115.pdf
- Description:
- DIODE ZENER 4.3V 320MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
PZU4.3B1A,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.3 V nominal working voltage at 5 mA, with 90 Ω maximum differential resistance and 3 µA reverse current at 0.5 mA test condition. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the PZU4.3B1A,115 datasheet, PZU4.3B1A,115 pinout, PZU4.3B1A,115 application, or PZU4.3B1A,115 equivalent, key selection criteria include tight 2 % voltage tolerance, low 3 µA leakage at IZ = 0.5 mA, hard breakdown knee, and compatibility with high-density SMT layouts using standard FR4 PCB footprints.
Technical Context
This Zener diode operates as a two-terminal shunt voltage reference, maintaining regulation by conducting reverse current above its specified breakdown voltage. Its hard breakdown knee and low dynamic impedance (≤90 Ω at IZ = 5 mA) ensure minimal voltage deviation under varying load conditions.
Designed for surface-mounted use on standard FR4 boards, it supports non-repetitive surge handling up to 40 W (100 µs square wave) and continuous dissipation of 320 mW at Tamb ≤ 25 °C. Thermal resistance from junction to solder point is 55 K/W, enabling reliable operation in thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V at IZ = 5 mA - precise reference point for feedback and clamping circuits |
| Voltage Tolerance | ±2 % (B1 series) - enables tighter regulation than ±5 % variants in precision biasing |
| Differential Resistance | ≤90 Ω at IZ = 5 mA - ensures minimal output voltage shift with load current changes |
| Reverse Current | 3 µA at IZ = 0.5 mA - low leakage preserves efficiency in battery-powered monitoring nodes |
| Total Power Dissipation | 320 mW at Tamb ≤ 25 °C on FR4 PCB - defines safe DC operating envelope without heatsinking |
| Non-repetitive Peak Power | 40 W (100 µs square wave) - supports transient overvoltage suppression in ESD-prone interfaces |
| Junction Temperature | −55 °C to +150 °C - allows deployment in industrial ambient environments |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked with 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 reverse-biased conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables sharp, predictable turn-on at 4.3 V - critical for accurate voltage clamping in signal conditioning |
| Very low leakage current | 3 µA at 0.5 mA test - reduces quiescent error in high-impedance reference dividers |
| Low dynamic impedance | ≤90 Ω at 5 mA - minimizes output voltage ripple under dynamic load steps |
| Small outline package | SOD323 footprint (1.7 × 1.25 mm) - supports miniaturized designs without sacrificing thermal performance |
| Thermal resistance to solder point | 55 K/W - facilitates efficient heat transfer to PCB copper, improving long-term reliability |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.3 V feedback to optocoupler input or TL431 control pin. Use Value: ±2 % tolerance ensures consistent output setpoint across production batches without manual trimming. |
Use Scenario: Clamping transient surges on low-voltage I/O lines (e.g., UART, GPIO). IC Role / Device Role / Timing Role: Reverse-biased Zener absorbing energy above 4.3 V to protect downstream logic inputs. Use Value: 40 W non-repetitive peak power rating handles ESD events per IEC 61000-4-2 Level 4 without degradation. |
| Reference Voltage Source | Signal Level Shifting |
|
Use Scenario: Generating a precision bias point for op-amp comparators or ADC reference buffers. IC Role / Device Role / Timing Role: Two-terminal passive reference establishing fixed 4.3 V node independent of supply variation. Use Value: 90 Ω dynamic impedance limits voltage drift to <1 mV per 10 µA load change - suitable for 12-bit accuracy. |
Use Scenario: Translating 5 V logic signals to 3.3 V domain using resistor-Zener level shifter. IC Role / Device Role / Timing Role: Cathode-connected Zener clamping high-side signal to 4.3 V − VF ≈ 3.2 V for safe interface. Use Value: Hard breakdown knee prevents ambiguous switching thresholds during signal transitions. |
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 nominal, ±2 %, but SOD323 package with higher 100 Ω rdif and 5 µA IR at 0.5 mA | Marginally higher regulation error under load; less suitable for ultra-low-leakage bias networks | Select when cost sensitivity outweighs sub-µA leakage requirements |
| MMSZ4V3T1G | 4.3 V, ±5 %, SOD123 package (2.7 × 1.6 mm), 100 Ω rdif, 5 µA IR at 0.5 mA | Larger footprint and looser tolerance limit use in space-constrained or precision circuits | Choose only if board layout accommodates larger package and ±5 % tolerance is acceptable |
Compared with PZU4.3B1A,115, BZX384-B4V3,115 trades slightly higher impedance for broader distributor availability, while MMSZ4V3T1G sacrifices both tolerance and size for legacy design continuity - neither matches the combination of ±2 %, 90 Ω, and SOD323 compactness.
Availability
PZU4.3B1A,115 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply and guaranteed traceability.
Supply support for PZU4.3B1A,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, with leadership in automotive-qualified and industrial-grade components.
The PZUxBA series targets general-purpose voltage regulation in space-constrained consumer, industrial, and computing systems where precision, small size, and robust surge handling are essential.
FAQ
What is the maximum continuous reverse current for PZU4.3B1A,115 at 25 °C ambient?
The device supports up to 200 mA forward current, but as a Zener regulator, its continuous reverse current is limited by power dissipation. At 25 °C ambient on FR4 PCB, maximum steady-state reverse current is 74 mA (320 mW ÷ 4.3 V), assuming full voltage drop across the diode. Derating applies above 25 °C per thermal resistance data.
How does the ±2 % tolerance affect regulation accuracy in a 5 V supply feedback loop?
With 4.3 V nominal Zener voltage and ±2 % tolerance, actual breakdown ranges from 4.21 V to 4.39 V. In a typical resistive divider feeding a TL431, this introduces ±0.4 % output voltage error at the main rail - well within 1 % target for most non-precision power supplies.
Can PZU4.3B1A,115 be used in place of a 3.3 V Zener for logic-level clamping?
No - its 4.3 V nominal breakdown exceeds the 3.3 V rail by 1 V, risking unintended conduction during normal operation. For 3.3 V clamping, select PZU3.3B1A,115 (3.3 V, ±2 %) or verify system margin against worst-case 4.21 V turn-on to avoid false triggering.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The SOD323 outline supports peak temperatures up to 260 °C, and the recommended reflow footprint (Fig. 10) uses 0.5 mm solder lands with 0.6 mm solder resist openings for reliable joint formation.
PZU4.3B1A,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
PZU4.3B1A,115 FAQ
1.How can I place an order for PZU4.3B1A,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU4.3B1A,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 PZU4.3B1A,115 reliable?
The price and inventory of PZU4.3B1A,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU4.3B1A,115 is usually 5 days.
3.What payment methods are accepted for PZU4.3B1A,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU4.3B1A,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU4.3B1A,115?
PZU4.3B1A,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU4.3B1A,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 PZU4.3B1A,115?
For technical support, including PZU4.3B1A,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU4.3B1A,115 requirements.
6.How does Aetrix verify that PZU4.3B1A,115 is sourced from the original manufacturer or authorized distributors?
All PZU4.3B1A,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 PZU4.3B1A,115 meets industry standards.
7.What is the process for return or replacement of PZU4.3B1A,115?
All PZU4.3B1A,115 units undergo pre-shipment inspection (PSI). If there is an issue with PZU4.3B1A,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 PZU4.3B1A,115 part is unused and in its original packaging.
Return procedure for PZU4.3B1A,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU4.3B1A,115 Tags
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