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Nexperia USA Inc. PZU43BAX
- Part No.:
- PZU43BAX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
PZU43BAX.pdf
- Description:
- PZU43BA/SOD323/SOD2
- Quantity:
- Payment:
- Shipping:
Inventory:6,542
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Product details
Overview
PZU43BAX from Nexperia is a general-purpose Zener voltage regulator diode in SOD323 (SC-76) surface-mount package, designed for precision voltage reference and clamping in low-power analog circuits. It delivers a nominal Zener voltage of 43 V with ±5 % tolerance (B-series), maximum differential resistance of 375 Ω at IZ = 2 mA, reverse current ≤150 nA at IZ = 0.5 mA, and non-repetitive peak reverse current of 40 A under 100 µs square-wave surge conditions. It is used in overvoltage protection circuits for sensor signal conditioning stages.
For engineers reviewing the PZU43BAX datasheet, PZU43BAX pinout, PZU43BAX application, or PZU43BAX equivalent, key selection criteria include its 43 V nominal Zener voltage, ±5 % tolerance, 375 Ω dynamic impedance at low bias, thermal resistance of 255 K/W (junction-to-solder point), and suitability for compact PCB layouts requiring stable low-current regulation.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under controlled current conditions. Its temperature coefficient is +0.6 mV/K at 43 V, indicating positive drift with junction temperature rise - critical for bias stability in temperature-varying environments.
The device exhibits hard breakdown knee behavior typical of higher-voltage Zeners in the PZUxBA series, with optimized leakage current for noise-sensitive applications. Its SOD323 package enables high-density placement while maintaining thermal performance via direct cathode solder-point conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 43 V nominal, ±5 % tolerance - defines precise clamping threshold for 42–44 V protection windows |
| Differential Resistance rdif | 375 Ω max at IZ = 2 mA - determines output impedance and regulation sensitivity to load current changes |
| Reverse Current IR | ≤150 nA at IZ = 0.5 mA - ensures minimal standby power loss and low error contribution in reference circuits |
| Non-repetitive Peak Reverse Current IZSM | 40 A at tp = 100 µs - supports transient overvoltage suppression without failure |
| Thermal Resistance Rth(j-sp) | 255 K/W - enables reliable heat dissipation through cathode pad to PCB copper, critical for sustained 320 mW operation |
| Junction Temperature Tj | 150 °C max - sets upper thermal limit for continuous operation in industrial ambient conditions |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package: 2-terminal, 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; carries reverse breakdown current; marked by bar on package |
| 2 | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-leakage Zener operation | IR ≤150 nA at 0.5 mA - minimizes error current in high-impedance reference dividers |
| Stable temperature coefficient | +0.6 mV/K - enables predictable voltage drift compensation in wide-temperature-range designs |
| Hard breakdown knee | Sharp transition into conduction at VZ - improves regulation accuracy and reduces noise in clamping applications |
| High surge robustness | 40 W non-repetitive peak power (100 µs) - withstands ESD and line transients without degradation |
Applications
| Industrial Sensor Signal Clamping | Low-Power Reference Voltage Generation |
|---|---|
Use Scenario: Protecting analog front-end inputs of 24 V industrial pressure sensors against 48 V field-wiring faults. IC Role / Device Role / Timing Role: Zener clamping element placed between signal line and ground to limit input voltage to 43 V ±5 %. Use Value: Prevents op-amp input stage damage while maintaining <150 nA leakage that avoids signal offset errors. |
Use Scenario: Providing stable 43 V reference for high-side current sense amplifier bias in battery management systems. IC Role / Device Role / Timing Role: Precision voltage reference source for feedback divider network in isolated DC-DC converter control loop. Use Value: 375 Ω dynamic impedance ensures <0.5 % regulation error across 1–5 mA bias current range. |
| ESD Protection for RS-485 Transceivers | Overvoltage Crowbar in Power Supply Monitoring |
Use Scenario: Secondary protection stage on RS-485 bus lines subjected to IEC 61000-4-5 surge events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp triggered during 40 A/100 µs surges to shunt energy away from transceiver IC. Use Value: 40 A peak current rating and hard knee enable sub-100 ns response without latch-up or parametric shift. |
Use Scenario: Triggering SCR-based crowbar circuit when 48 V supply exceeds safe operating window in telecom rectifier modules. IC Role / Device Role / Timing Role: Zener sensing element feeding gate drive to thyristor upon sustained overvoltage condition. Use Value: +0.6 mV/K TC allows predictable trip-point drift over –40 to +85 °C ambient, avoiding false triggering. |
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 | Same 43 V nominal, ±5 %, but SOT-23 package (larger footprint, 350 mW Ptot) and higher rdif (500 Ω) | Less suitable for ultra-dense layouts; higher thermal resistance (375 K/W j-a) limits power handling on small pads | Select when board space permits and higher surge margin is needed via larger thermal mass |
| MMSZ43ET1G | 43 V, ±5 %, SOD-123 package (2.3 × 1.3 mm), rdif = 410 Ω, IR = 100 nA @ 0.5 mA | Lower leakage improves reference accuracy but SOD-123 has inferior solder-point thermal path (Rth(j-sp) = 320 K/W) | Prefer for ultra-low-power references where leakage dominates error budget, not thermal-limited operation |
Compared with BZX84-C43 and MMSZ43ET1G, PZU43BAX offers the best balance of compact SOD323 size, 255 K/W junction-to-solder-point thermal resistance, and 150 nA leakage - making it optimal for space-constrained industrial clamping where both thermal reliability and low-error biasing matter.
Availability
PZU43BAX is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 protection circuits, and low-power voltage reference designs requiring stable component supply and traceable sourcing.
Supply support for PZU43BAX 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 is part of Nexperia's precision Zener regulator portfolio, engineered specifically for stable voltage reference and overvoltage clamping in space-constrained, thermally demanding industrial and communication equipment.
FAQ
What is the maximum continuous power dissipation for PZU43BAX at 25 °C ambient?
The total power dissipation (Ptot) is rated at 320 mW when mounted on an FR4 PCB with single-sided copper, tin-plated, and standard SOD323 footprint. This rating assumes Tamb ≤ 25 °C and accounts for thermal resistance to ambient (390 K/W); derating is required above 25 °C per the thermal characteristics table.
Does PZU43BAX have automotive qualification?
No. PZU43BAX is not automotive-qualified. The datasheet explicitly states that unless otherwise specified, Nexperia products are not qualified or tested to automotive standards (AEC-Q101). It is intended for industrial, communications, and consumer applications only.
How is the cathode identified on the SOD323 package?
The cathode is marked by a visible bar on the top surface of the SOD323 package, aligned with pin 1. Pin 1 is the cathode terminal, and pin 2 is the anode - consistent with Table 2 "Pinning information" and Figure 9 package outline in the official Nexperia datasheet Rev. 4.
What is the typical temperature coefficient for PZU43BAX and how does it affect regulation?
The temperature coefficient (SZ) is +0.6 mV/K at 43 V, meaning the Zener voltage increases by approximately 0.6 mV per 1 K rise in junction temperature. This positive drift must be accounted for in precision reference designs operating across –40 to +125 °C ambient ranges to avoid >20 mV total error.
PZU43BAX 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:
- -
PZU43BAX FAQ
1.How can I place an order for PZU43BAX through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU43BAX 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 PZU43BAX reliable?
The price and inventory of PZU43BAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU43BAX is usually 5 days.
3.What payment methods are accepted for PZU43BAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU43BAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU43BAX?
PZU43BAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU43BAX 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 PZU43BAX?
For technical support, including PZU43BAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU43BAX requirements.
6.How does Aetrix verify that PZU43BAX is sourced from the original manufacturer or authorized distributors?
All PZU43BAX 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 PZU43BAX meets industry standards.
7.What is the process for return or replacement of PZU43BAX?
All PZU43BAX units undergo pre-shipment inspection (PSI). If there is an issue with PZU43BAX, 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 PZU43BAX part is unused and in its original packaging.
Return procedure for PZU43BAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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