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Nexperia USA Inc. PZU51BAX
- Part No.:
- PZU51BAX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
PZU51BAX.pdf
- Description:
- PZU51BA/SOD323/SOD2
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
PZU51BAX from Nexperia is a general-purpose Zener voltage regulator diode in SOD323 (SC-76) surface-mount package, designed for precision voltage reference and overvoltage protection in low-power circuits. It delivers a nominal 51 V Zener voltage with ±5 % tolerance (B-series), 40 W non-repetitive peak reverse power dissipation, 320 mW total power dissipation at 25 °C ambient, and 40 nA reverse current at 0.5 mA test current - enabling stable regulation in space-constrained power management and signal conditioning applications.
For engineers reviewing the PZU51BAX datasheet, PZU51BAX pinout, PZU51BAX application, or PZU51BAX equivalent, key selection criteria include its 51 V nominal Zener voltage, ±5 % tolerance, SOD323 footprint compatibility, low leakage (40 nA @ IZ = 0.5 mA), and thermal resistance of 255 K/W (junction-to-solder point) for reliable operation in compact PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its cathode-anode terminals under varying load and temperature conditions. Its differential resistance of ≤400 Ω at IZ = 2 mA ensures minimal voltage deviation during current fluctuations, while the temperature coefficient of +0.4 mV/K (typical) supports predictable drift behavior above 47 V nominal variants.
The device uses silicon planar epitaxial construction and is optimized for surface-mounted design on FR4 PCBs with standard tin-plated copper pads. Its non-repetitive surge capability (100 µs square wave, 40 W) enables transient suppression in DC supply rails without external clamping circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.0 V to 54.0 V at IZ = 2 mA - defines stable regulation point for 51 V nominal rail supervision |
| Tolerance | ±5 % (B-series) - allows direct use in non-critical reference applications without trimming |
| Reverse Current (IR) | ≤180 nA at VR = 35.7 V - ensures minimal standby power loss in battery-backed systems |
| Differential Resistance (rdif) | ≤400 Ω at IZ = 2 mA - limits output voltage variation under dynamic load changes |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 µs pulse - provides single-event surge immunity without derating |
| Total Power Dissipation (Ptot) | 320 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling in standard layout |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports industrial and extended-temperature operation |
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 by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated voltage node; polarity marking bar identifies this terminal |
| 2 | Anode | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower potential than cathode |
Key Features
| Feature | Design Value |
|---|---|
| Low leakage current | 40 nA at 0.5 mA test current - reduces quiescent power draw in always-on monitoring circuits |
| Hard breakdown knee | Sharp Zener transition at 51 V - improves regulation accuracy and noise rejection in reference designs |
| Optimized thermal resistance | 255 K/W junction-to-solder point - enables higher sustained power in thermally constrained layouts |
| Small outline package | SOD323 footprint - fits high-density PCBs where space is limited, e.g., portable instrumentation |
| ESD robustness | HBM rating ≥2 kV (per Nexperia standard qualification) - withstands handling and board assembly stress |
Applications
| Power Supply Monitoring | Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring 48 V telecom DC distribution rail for undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Zener diode acts as precision voltage threshold detector feeding comparator input. Use Value: ±5 % tolerance and 0.4 mV/K temperature coefficient enable accurate trip-point setting across −40 °C to +85 °C operating range. |
Use Scenario: Clamping transient spikes on 36–54 V industrial sensor supply lines. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts excess energy to ground during ESD or inductive kick events. Use Value: 40 W non-repetitive surge rating handles 100 µs transients without degradation, eliminating need for TVS co-location. |
| Reference Voltage Source | Signal Level Shifting |
|
Use Scenario: Providing stable 51 V bias for photomultiplier tube (PMT) anode chain in analytical instruments. IC Role / Device Role / Timing Role: Zener establishes fixed reference potential for cascaded resistor-divider network. Use Value: 400 Ω differential resistance minimizes loading-induced error when sourcing <100 µA current. |
Use Scenario: Level-shifting logic signals between 3.3 V microcontroller and 51 V analog front-end interface. IC Role / Device Role / Timing Role: Zener clamps signal swing to safe voltage window, protecting downstream inputs. Use Value: Low capacitance (<50 pF at 0 V) preserves signal edge integrity up to 10 MHz without added RC filtering. |
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-C51 | Same 51 V nominal, ±5 %, but SOT23 package (larger footprint, 350 mW Ptot) | Higher thermal mass suits higher average power; less suitable for ultra-dense layouts | Choose when board real estate allows larger package and >320 mW continuous dissipation is needed |
| MMSZ5257B | 51 V nominal, ±5 %, SOD123 package (2.7 mm × 1.6 mm), 500 mW Ptot, 100 nA IR | Higher power rating and lower leakage, but 3× larger area than SOD323 | Prefer for cost-sensitive industrial designs where size is secondary to leakage and power margin |
Compared with BZX84-C51 and MMSZ5257B, PZU51BAX offers the smallest PCB footprint (SOD323) and lowest leakage among 51 V Zeners in its class, making it optimal for miniaturized, low-quiescent-current applications - though its 320 mW power limit requires careful thermal layout versus the higher-rated alternatives.
Availability
PZU51BAX is available at Aetrix Electronics and suitable for power supply monitoring, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for PZU51BAX 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.
PZU51BAX belongs to the PZUxBA series of general-purpose Zener diodes engineered for precision voltage regulation and transient suppression in space-constrained, low-power electronic systems.
FAQ
What is the maximum continuous reverse current for PZU51BAX at 25 °C ambient?
The maximum continuous reverse current is not specified as a standalone parameter; instead, the device is rated for 320 mW total power dissipation at Tamb ≤ 25 °C on FR4 PCB. At 51 V Zener voltage, this corresponds to ~6.3 mA average reverse current (Ptot/VZ). Exceeding this current risks thermal runaway unless board-level heatsinking is implemented.
Does PZU51BAX require a series current-limiting resistor in typical regulator applications?
Yes - a series resistor is mandatory to limit reverse current to within safe operating limits. For example, with a 55 V supply and target 5 mA Zener current, a 820 Ω resistor (R = (55 V − 51 V)/5 mA) ensures stable operation while maintaining Ptot below 320 mW and preventing thermal overstress.
How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
At 51 V nominal, the temperature coefficient is +0.4 mV/K (typical). Over a 165 K range, this yields ~66 mV total drift - approximately ±0.13 % of 51 V. This low drift supports stable reference performance in industrial environments without active compensation.
Can PZU51BAX be used in parallel for higher power handling?
No - Zener diodes must not be paralleled due to mismatched breakdown voltages causing current hogging and thermal failure. For higher power, select a single higher-rated device (e.g., MMSZ5257B) or implement active regulation with a pass transistor and reference.
PZU51BAX 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:
- -
PZU51BAX FAQ
1.How can I place an order for PZU51BAX through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU51BAX 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 PZU51BAX reliable?
The price and inventory of PZU51BAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU51BAX is usually 5 days.
3.What payment methods are accepted for PZU51BAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU51BAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU51BAX?
PZU51BAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU51BAX 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 PZU51BAX?
For technical support, including PZU51BAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU51BAX requirements.
6.How does Aetrix verify that PZU51BAX is sourced from the original manufacturer or authorized distributors?
All PZU51BAX 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 PZU51BAX meets industry standards.
7.What is the process for return or replacement of PZU51BAX?
All PZU51BAX units undergo pre-shipment inspection (PSI). If there is an issue with PZU51BAX, 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 PZU51BAX part is unused and in its original packaging.
Return procedure for PZU51BAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU51BAX Tags
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