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Nexperia USA Inc. BZX8450-B51R
- Part No.:
- BZX8450-B51R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B51R.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,957
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Product details
Overview
BZX8450-B51R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and low-power biasing at 51 V nominal working voltage with ±2 % tolerance, 50 µA test current, and 250 mW total power dissipation - used in portable battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX8450-B51R datasheet, BZX8450-B51R pinout, BZX8450-B51R application, or BZX8450-B51R equivalent, this page delivers verified electrical characteristics, thermal resistance (330 K/W to solder point), differential resistance (400 Ω at IZ = 2 mA), temperature coefficient (+0.05 mV/K), and reverse leakage behavior under VR ≤ 51 V.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 51 V output across load variations by conducting reverse current above its breakdown threshold. Its specified test condition of IZ = 50 µA enables ultra-low quiescent current operation ideal for energy-constrained systems.
The BZX8450-B51R exhibits a positive temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at f = 1 MHz, VR = 0 V - critical for noise-sensitive analog references and fast-switching protection circuits where parasitic capacitance affects transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 51 V ±2 % at IZ = 50 µA - defines precise regulation point for high-voltage reference rails |
| Differential Resistance | 400 Ω at IZ = 2 mA - determines output impedance and load regulation error under varying current |
| Forward Voltage | 0.9 V max at IF = 10 mA - ensures minimal forward conduction loss during polarity-reversal protection |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous power handling without derating |
| Thermal Resistance (j–sp) | 330 K/W - quantifies junction-to-solder-point thermal path efficiency for thermal design margining |
| Reverse Current | ≤ 0.05 µA at VR = 51 V - guarantees negligible standby leakage in always-on monitoring circuits |
| Diode Capacitance | 40 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise coupling and filtering performance |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with three terminals: anode (Pin 1), not connected (Pin 2), cathode (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased operation requires cathode at higher potential |
| 2 | Not Connected | Electrically isolated terminal; no internal bond wire or silicon connection - must remain floating |
| 3 | Cathode | Connected to regulated voltage rail; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoamp-level standby circuits without compromising regulation accuracy |
| Controlled leakage optimization | Intentional minor rise in IR for B-series - improves switching speed and reduces broadband noise in feedback paths |
| Tight voltage tolerance | ±2 % (B-grade) - supports high-accuracy voltage monitoring in industrial sensor signal conditioning |
| Thermal performance | Rth(j–sp) = 330 K/W - allows direct thermal modeling from junction to PCB copper for reliability analysis |
Applications
| Microcontroller Reset Circuit | Portable Sensor Bias Rail |
|---|---|
|
Use Scenario: Provides clean 51 V reference to enable reset ICs or supervisor circuits in battery-powered edge devices. IC Role / Device Role / Timing Role: Shunt regulator establishing stable threshold voltage for reset assertion timing. Use Value: Enables deterministic reset behavior with <0.05 µA leakage, preserving battery life over multi-year deployments. |
Use Scenario: Supplies regulated bias to high-voltage op-amps or photodiode transimpedance stages in handheld analyzers. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end gain calibration. Use Value: Delivers ±2 % stability over temperature, reducing need for digital trimming in factory calibration. |
| Industrial Signal Conditioning | ESD Protection Clamp |
|
Use Scenario: Stabilizes excitation voltage for 4–20 mA loop-powered transmitters operating from 48 V DC supplies. IC Role / Device Role / Timing Role: Low-current Zener clamp setting upper rail for current-loop driver ICs. Use Value: Maintains regulation within 400 Ω dynamic impedance, minimizing load-induced drift in 2-wire systems. |
Use Scenario: Acts as secondary clamping element in multi-stage ESD protection networks for RS-485 interfaces. IC Role / Device Role / Timing Role: High-voltage shunt limiter absorbing residual surge energy after primary TVS conduction. Use Value: 51 V standoff with 40 pF capacitance avoids signal integrity degradation on 10 Mbps differential lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C51 | ±5 % tolerance, 50 µA test current, same SOT23 package and 51 V nominal rating | Higher voltage variation acceptable in non-critical biasing; lower cost for non-precision designs | Select when ±5 % regulation tolerance satisfies system accuracy requirements and cost sensitivity is high |
| MMSZ5267BT1G | 51 V ±5 %, 200 mW Ptot, 500 Ω rdiff at IZ = 20 mA, SOD-123 package | Larger footprint and higher power dissipation limit; less suitable for ultra-low-IQ designs | Choose when board space permits larger package and higher surge current capability is required |
Compared with BZX8450-B51R, BZX84-C51 trades tighter tolerance for cost reduction while retaining identical test conditions and thermal profile; MMSZ5267BT1G offers higher surge robustness but sacrifices low-leakage performance and SOT23 compatibility.
Availability
BZX8450-B51R is available at Aetrix Electronics and suitable for microcontroller reset circuits, portable sensor bias rails, industrial signal conditioning, and ESD protection clamps requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for BZX8450-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 logic, discrete, and MOSFET solutions with manufacturing rooted in process control and automotive-grade quality systems.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding tight voltage tolerance, ultra-low test current, and predictable thermal behavior in SOT23.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B51R?
The BZX8450-B51R has a nominal Zener voltage of 51 V with ±2 % tolerance, meaning breakdown occurs between 49.98 V and 52.02 V at IZ = 50 µA. Its absolute maximum non-repetitive peak reverse voltage is limited by PZSM = 40 W for 100 µs pulses, not by fixed VRM.
Can BZX8450-B51R be used in series with other Zeners to achieve higher reference voltages?
No - BZX8450-B51R is not characterized for series operation. Its differential resistance (400 Ω) and temperature coefficient (+0.05 mV/K) are specified individually; stacking introduces mismatched thermal drift and current-sharing instability that compromises regulation accuracy and reliability.
Is Pin 2 internally connected or should it remain unconnected on the PCB?
Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and has no internal silicon or bond wire connection. It must remain electrically floating on the PCB - no solder mask opening, no trace routing, and no grounding or tying to any net.
How does the BZX8450-B51R's 50 µA test current affect circuit design?
The 50 µA test current means the diode achieves its rated 51 V Zener voltage only when biased at that exact current. Designers must ensure external bias networks deliver ≥50 µA under worst-case conditions (e.g., min supply, max temperature) to guarantee regulation accuracy - otherwise, voltage will drop due to rdiff slope.
BZX8450-B51R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- 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):
- 180 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
BZX8450-B51R FAQ
1.How can I place an order for BZX8450-B51R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-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 BZX8450-B51R reliable?
The price and inventory of BZX8450-B51R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B51R is usually 5 days.
3.What payment methods are accepted for BZX8450-B51R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B51R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B51R?
BZX8450-B51R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-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 BZX8450-B51R?
For technical support, including BZX8450-B51R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B51R requirements.
6.How does Aetrix verify that BZX8450-B51R is sourced from the original manufacturer or authorized distributors?
All BZX8450-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 BZX8450-B51R meets industry standards.
7.What is the process for return or replacement of BZX8450-B51R?
All BZX8450-B51R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-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 BZX8450-B51R part is unused and in its original packaging.
Return procedure for BZX8450-B51R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B51R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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