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Nexperia USA Inc. PZU43B2AX
- Part No.:
- PZU43B2AX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
PZU43B2AX.pdf
- Description:
- PZU43B2A/SOD323/SOD2
- Quantity:
- Payment:
- Shipping:
Inventory:7,685
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Product details
Overview
PZU43B2AX from Nexperia is a precision Zener voltage regulator diode in SOD323 (SC-76) package, designed for low-power voltage reference and stabilization in biasing, overvoltage protection, and signal conditioning circuits. It delivers a nominal 43 V Zener voltage with ±2 % tolerance (B2 series), 375 nA reverse current at IZ = 0.5 mA, 50 Ω maximum differential resistance at IZ = 2 mA, and operates across –55 °C to +150 °C ambient temperature.
For engineers reviewing the PZU43B2AX datasheet, PZU43B2AX pinout, PZU43B2AX application, or PZU43B2AX equivalent, this device is selected for stable mid-voltage regulation where tight tolerance, low leakage, and compact SMD footprint are critical - especially in power supply feedback loops, analog sensor excitation, and industrial control interface circuits.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under varying load and temperature conditions. Its B2 tolerance grade (±2 %) ensures tighter regulation than standard ±5 % parts, while its 375 nA reverse current at 0.5 mA test current supports low-power standby operation without excessive quiescent drain.
The device exhibits a positive temperature coefficient of +0.6 mV/K at nominal working current, enabling predictable drift compensation in multi-diode reference strings. Its 45 pF capacitance at 1 MHz and 0 V reverse bias minimizes high-frequency noise coupling in sensitive analog paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, ±2 % tolerance (B2 grade) - enables precise 43 V reference generation with minimal calibration overhead |
| Reverse Current (IR) | 375 nA at VR = 40 V - ensures ultra-low standby power loss in always-on monitoring circuits |
| Differential Resistance (rdif) | ≤50 Ω at IZ = 2 mA - provides stable regulation under small-signal load variations |
| Temperature Coefficient (SZ) | +0.6 mV/K - allows predictable thermal drift modeling for compensated reference designs |
| Package | SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm - supports high-density PCB layouts with standard reflow soldering |
| Power Dissipation (Ptot) | 320 mW at Tamb ≤ 25 °C on FR4 PCB - defines continuous DC power handling in typical board-mount conditions |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs - supports transient surge clamping in ESD or inductive kickback protection |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with cathode marked by a bar on the body; 2-terminal configuration optimized for automated placement and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; marking bar identifies this terminal - polarity must be observed to avoid forward conduction |
| 2 | Anode | Connected to ground or lower-potential rail; forms the reference return path for Zener current flow |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance (B2 grade) | Reduces post-manufacturing trimming needs in precision reference circuits |
| Ultra-low reverse current (375 nA @ 40 V) | Minimizes loading error in high-impedance voltage divider networks |
| Optimized leakage profile for noise reduction | Intentional minor leakage rise improves switching speed and reduces broadband noise per AN90031 |
| Hard breakdown knee and low dynamic impedance | Ensures sharp, repeatable turn-on behavior for reliable overvoltage clamping |
| JEDEC-standard SOD323 footprint | Enables drop-in replacement and compatibility with existing pick-and-place and reflow processes |
Applications
| Industrial Sensor Excitation | DC-DC Converter Feedback Reference |
|---|---|
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Zener diode acts as a passive, two-terminal voltage reference source for ratiometric measurement circuits. Use Value: ±2 % tolerance and <375 nA leakage ensure sub-0.1 % full-scale error contribution without active regulation overhead. |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Functions as secondary-side voltage reference that biases optocoupler LED current proportional to output deviation. Use Value: 43 V rating allows direct use with common 36–48 V industrial bus rails; low rdif maintains loop stability across line/load transients. |
| Overvoltage Protection Clamp | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Clamping induced surges on 24 V fieldbus lines (e.g., RS-485 stubs) to protect transceiver ICs. IC Role / Device Role / Timing Role: Zener diode conducts during transient overvoltage events, diverting energy to ground before IC damage occurs. Use Value: 40 W non-repetitive peak power rating handles 100 µs surges per IEC 61000-4-5 Level 3 without degradation. |
Use Scenario: Generating a clean reset threshold for 3.3 V microcontrollers powered from unregulated 5 V supplies. IC Role / Device Role / Timing Role: Used in resistor-divider + comparator configuration to assert reset when supply drops below 4.5 V. Use Value: Stable 43 V reference enables accurate scaling to sub-1 % reset threshold accuracy, independent of supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | ±5 % tolerance (C grade), 500 nA IR at 40 V, SOT23 package (larger footprint) | Higher tolerance and leakage reduce accuracy in precision references; larger size limits high-density layouts | Select only if cost sensitivity outweighs regulation accuracy and board space constraints |
| MMSZ43ET1G | ±5 % tolerance, 100 nA IR at 40 V, SOD123 package (higher thermal resistance) | Lower leakage benefits ultra-low-power designs, but SOD123's 400 K/W Rth(j-a) limits power handling | Prefer for battery-powered systems needing minimal standby current, not for sustained 320 mW operation |
Compared with PZU43B2AX, BZX84-C43 trades precision and miniaturization for cost, while MMSZ43ET1G prioritizes leakage reduction at the expense of thermal performance and tolerance - making PZU43B2AX optimal for industrial applications demanding both accuracy and robust SMD integration.
Availability
PZU43B2AX is available at Aetrix Electronics and suitable for industrial sensor excitation, DC-DC converter feedback reference, and overvoltage protection clamp applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PZU43B2AX 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, serving automotive, industrial, and consumer markets with JEDEC-qualified components.
PZUxBA series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered for stable voltage reference and protection in space-constrained, thermally demanding SMD applications - emphasizing precision, low leakage, and manufacturability.
FAQ
What is the maximum continuous power dissipation for PZU43B2AX at 70 °C ambient?
At 70 °C ambient, derating applies: Ptot = 320 mW × [1 − (70 − 25)/150] = 224 mW. This accounts for linear thermal derating per the datasheet's 150 °C junction limit and 25 °C base rating on FR4 PCB with single-sided copper.
Does PZU43B2AX have a specified Zener impedance at 1 mA test current?
No - the datasheet specifies differential resistance rdif ≤ 50 Ω only at IZ = 2 mA. At 1 mA, no guaranteed value is provided; typical curves show ~65 Ω, but design must rely on the 2 mA specification for worst-case analysis.
Can PZU43B2AX be used in place of a 43 V TVS diode for ESD protection?
No - it is not rated for IEC 61000-4-2 ESD pulses. While it clamps at ~43 V, its 40 W non-repetitive rating applies only to 100 µs square waves, not nanosecond ESD events. Dedicated TVS diodes (e.g., PESD5V0S1BA) are required for compliant ESD protection.
How does the B2 tolerance grade affect long-term stability in a 10-year industrial deployment?
The ±2 % initial tolerance is independent of long-term drift, which is specified as <1 % ΔVZ after 1000 hours at 150 °C junction temperature. So total variation remains within ±3 % over life - sufficient for most industrial reference applications without recalibration.
PZU43B2AX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
PZU43B2AX FAQ
1.How can I place an order for PZU43B2AX through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU43B2AX 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 PZU43B2AX reliable?
The price and inventory of PZU43B2AX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU43B2AX is usually 5 days.
3.What payment methods are accepted for PZU43B2AX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU43B2AX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU43B2AX?
PZU43B2AX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU43B2AX 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 PZU43B2AX?
For technical support, including PZU43B2AX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU43B2AX requirements.
6.How does Aetrix verify that PZU43B2AX is sourced from the original manufacturer or authorized distributors?
All PZU43B2AX 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 PZU43B2AX meets industry standards.
7.What is the process for return or replacement of PZU43B2AX?
All PZU43B2AX units undergo pre-shipment inspection (PSI). If there is an issue with PZU43B2AX, 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 PZU43B2AX part is unused and in its original packaging.
Return procedure for PZU43B2AX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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