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Nexperia USA Inc. PZU84-B51R
- Part No.:
- PZU84-B51R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B51R.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,696
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Product details
Overview
PZU84-B51R from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 51 V breakdown voltage, optimized for precision voltage reference and overvoltage clamping in low-power analog circuits. It delivers 250 mW total power dissipation in SOT23 package, features hard breakdown knee and very low leakage current (≤0.05 μA at VR = 51 V), and is used in industrial sensor signal conditioning and power supply feedback loops.
For engineers reviewing the PZU84-B51R datasheet, PZU84-B51R pinout, PZU84-B51R application, or PZU84-B51R equivalent, key selection criteria include Zener voltage tolerance (±2 %), differential resistance (400 Ω at IZ = 2 mA), temperature coefficient (35.7 mV/K), junction-to-ambient thermal resistance (500 K/W), and non-repetitive surge capability (40 W at 100 μs).
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its design emphasizes low dynamic impedance and tight voltage tolerance for high-accuracy regulation in feedback networks and reference circuits.
The device exhibits a hard breakdown knee and low leakage current typical of the PZU84-B series, enabling reliable clamping without significant pre-breakdown conduction. Its thermal resistance profile (Rth(j-a) = 500 K/W) and surge rating (40 W, 100 μs) support robust operation in transient-prone environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.0 V to 54.0 V at IZ = 2 mA - defines precise clamping threshold for 51 V nominal systems |
| Tolerance | ±2 % - ensures voltage accuracy critical for feedback loop stability and reference integrity |
| Differential Resistance (rdif) | 400 Ω max at IZ = 2 mA - determines regulation stiffness and output impedance in shunt configuration |
| Temperature Coefficient (SZ) | 35.7 mV/K - quantifies voltage drift per degree Celsius, enabling thermal error budgeting |
| Reverse Current (IR) | ≤0.05 μA at VR = 51 V - minimizes standby power loss and prevents false triggering in high-impedance nodes |
| Total Power Dissipation (Ptot) | 250 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - supports ESD and surge suppression without degradation |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for reflow and wave soldering per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in reverse-bias configuration; carries forward current during transient events |
| 2 (n.c.) | Not connected | Internally unconnected terminal; must remain floating-no PCB trace or pad connection required |
| 3 (Cathode) | Cathode connection | Connected to regulated voltage node; serves as reference output and primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables sharp, predictable turn-on at VZ with minimal pre-breakdown conduction-critical for accurate clamping |
| Very low leakage current | ≤0.05 μA at VR = 51 V reduces loading on high-impedance sources and improves system quiescent efficiency |
| ±2 % voltage tolerance | Meets tight regulation requirements in precision feedback paths where 1 % or better accuracy is mandated |
| Optimized for low-current operation | Specified performance at IZ = 2 mA enables use in micro-power designs without external bias amplification |
| SOT23 footprint compatibility | Standardized 3-pin layout allows drop-in replacement in space-constrained layouts without redesign |
Applications
| Industrial Sensor Signal Conditioning | Switch-Mode Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end circuitry operating in harsh ambient temperatures. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt voltage reference, setting bias point for op-amp input stage and ADC reference divider. Use Value: ±2 % tolerance and 35.7 mV/K temperature coefficient enable <±0.5 % total error over −40 °C to +125 °C, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Providing stable feedback voltage to optocoupler-based error amplifier in isolated flyback converter. IC Role / Device Role / Timing Role: Shunt regulator establishes fixed 51 V reference for TL431 cathode drive, ensuring consistent output voltage regulation. Use Value: 400 Ω differential resistance minimizes load-induced voltage shift during line/load transients, maintaining ±1 % output regulation. |
| Overvoltage Protection Clamp | Microcontroller GPIO Protection |
Use Scenario: Clamping 48 V DC bus surges in factory automation I/O modules exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-acting Zener clamp diverts transient energy away from downstream protection ICs and interface circuitry. Use Value: 40 W non-repetitive peak power rating at 100 μs absorbs IEC 61000-4-5 Level 4 surges without degradation or parametric shift. |
Use Scenario: Protecting 3.3 V microcontroller analog input pins from accidental 24 V field wiring faults in building control panels. IC Role / Device Role / Timing Role: Low-leakage Zener placed between pin and ground limits fault voltage to safe level while minimizing idle current draw. Use Value: ≤0.05 μA leakage at 3.3 V ensures no measurable impact on sensor bias networks or battery life in always-on monitoring nodes. |
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 | ±5 % tolerance, higher rdif (600 Ω), higher IR (0.1 μA), same SOT23 package | Acceptable for non-critical voltage references but unsuitable for precision feedback loops requiring <±0.5 % total error | Select when cost sensitivity outweighs regulation accuracy and thermal drift requirements |
| MMSZ5257B | ±5 % tolerance, 500 mW Ptot, higher Rth(j-a) (625 K/W), different marking and packaging | Higher power handling supports higher continuous current but poorer thermal performance on standard PCBs | Prefer only if >250 mW steady-state dissipation is required and board-level thermal management is enhanced |
Compared with BZX84-C51 and MMSZ5257B, PZU84-B51R provides tighter voltage tolerance (±2 % vs. ±5 %), lower leakage (0.05 μA vs. ≥0.1 μA), and superior thermal resistance (500 K/W vs. ≥625 K/W), making it optimal for precision, low-power, and thermally constrained applications.
Availability
PZU84-B51R is available at Aetrix Electronics and suitable for industrial sensor interfaces, switch-mode power supply feedback networks, overvoltage clamping circuits, and microcontroller I/O protection requiring stable component supply and long-term obsolescence mitigation.
Supply support for PZU84-B51R 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 ISO/TS 16949-certified manufacturing.
The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for stable voltage reference and clamping in space-constrained, low-power SMT applications demanding tight tolerance and low leakage.
FAQ
What is the maximum continuous reverse current (IZ) that PZU84-B51R can sustain without exceeding its 250 mW power limit?
At nominal 51 V Zener voltage, the maximum continuous reverse current is approximately 4.9 mA (250 mW ÷ 51 V), assuming Tamb = 25 °C and standard FR4 PCB mounting. Derating is required above 25 °C per the 500 K/W thermal resistance specification, reducing usable current by ~1.0 mA per 10 °C rise in ambient temperature.
Does PZU84-B51R have a specified Zener test current (IZT), and what is its value?
Yes-PZU84-B51R is characterized at IZ = 2 mA, as confirmed in Table 9 of the datasheet. This test current defines all key parameters including VZ (48.0–54.0 V), rdif (400 Ω max), and SZ (35.7 mV/K). Operation outside this current range requires interpolation using published VZ vs. IZ curves (Fig. 8).
Can PZU84-B51R be used in place of a 5.1 V Zener diode in a low-voltage LDO feedback network?
No-PZU84-B51R has a nominal 51 V breakdown voltage and is not interchangeable with 5.1 V Zeners like PZU84-B5V1. Substituting it would result in catastrophic overvoltage at the feedback node. The "B51" suffix explicitly denotes 51 V nominal rating, not 5.1 V; correct part selection requires matching both voltage and tolerance grade.
Is Pin 2 (n.c.) electrically isolated or internally bonded in the SOT23 package?
Pin 2 is internally not connected-no die bond wire or metallization links it to the silicon chip. It is fully isolated and must remain unconnected on the PCB. Routing traces or applying solder paste to this pad violates the manufacturer's mounting recommendations and may compromise thermal performance or mechanical reliability.
PZU84-B51R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PZU84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 400 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
PZU84-B51R FAQ
1.How can I place an order for PZU84-B51R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B51R 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 PZU84-B51R reliable?
The price and inventory of PZU84-B51R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B51R is usually 5 days.
3.What payment methods are accepted for PZU84-B51R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B51R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B51R?
PZU84-B51R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B51R 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 PZU84-B51R?
For technical support, including PZU84-B51R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B51R requirements.
6.How does Aetrix verify that PZU84-B51R is sourced from the original manufacturer or authorized distributors?
All PZU84-B51R 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 PZU84-B51R meets industry standards.
7.What is the process for return or replacement of PZU84-B51R?
All PZU84-B51R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B51R, 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 PZU84-B51R part is unused and in its original packaging.
Return procedure for PZU84-B51R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B51R Tags
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MM5Z5V1ST1G
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