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Nexperia USA Inc. BZX8450-C51R
- Part No.:
- BZX8450-C51R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C51R.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,308
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Product details
Overview
BZX8450-C51R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and regulation in ultra-low-power circuits. It delivers a nominal 51 V Zener voltage at 50 µA test current, with ±5 % tolerance, 400 Ω differential resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX8450-C51R datasheet, BZX8450-C51R pinout, BZX8450-C51R application, or BZX8450-C51R equivalent, key selection criteria include its low 50 µA test current specification, intentional leakage optimization for noise reduction per AN90031, SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output by conducting reverse current above its specified Zener breakdown voltage (51 V). Its design targets low-bias operation, with guaranteed regulation down to 50 µA and maximum forward voltage of 0.9 V at 10 mA.
The BZX8450-C51R belongs to the "C" tolerance series (±5 %), features an intentional minor rise in leakage current to improve switching speed and reduce noise, and exhibits a positive temperature coefficient of +0.05 mV/K - enabling predictable drift behavior in temperature-sensitive references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal at IZ = 50 µA; defines precise regulation threshold for low-power bias networks |
| Tolerance | ±5 % (C-series); ensures predictable voltage margin for reference design without trimming |
| Differential Resistance (rdiff) | 400 Ω max at IZ = 2 mA; determines load regulation error under varying current draw |
| Reverse Leakage (IR) | 0.05 µA max at VR = 51 V; enables ultra-low quiescent current in always-on monitoring circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; supports bidirectional protection or polarity detection in compact layouts |
| Power Dissipation (Ptot) | 250 mW max at Tamb ≤ 25 °C on FR4 PCB; sets thermal derating boundary for SOT23 mounting |
| Thermal Resistance (Rth(j-sp)) | 330 K/W to cathode solder point; informs PCB copper area requirements for sustained 250 mW operation |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads and standard FR4 reflow footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation; must be routed with minimal parasitic inductance |
| 2 | Not Connected (n.c.) | Internally unconnected; electrically isolated; no PCB trace or pad required beyond mechanical support |
| 3 | Cathode (K) | Connects to higher-potential node; primary heat path to PCB; requires direct thermal via or copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in microamp-level supply rails without loading error |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces high-frequency noise and improves transient response |
| ±5 % voltage tolerance | Guaranteed over full temperature range - eliminates need for post-assembly calibration in cost-sensitive designs |
| SOT23 footprint compatibility | Standard 3-pin, 1.9 mm pitch layout - supports automated placement and reflow with industry-standard tooling |
| 150 °C junction rating | Enables operation in extended-temperature industrial environments without derating below 125 °C ambient |
Applications
| Portable Sensor Reference | Low-Power MCU Reset Circuit |
|---|---|
Use Scenario: Precision analog front-end in battery-powered environmental sensors requiring stable 51 V bias for ionization chamber or photomultiplier tube interface. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 51 V rail independent of battery decay; replaces bulkier discrete resistor-Zener combinations. Use Value: Enables 12-month battery life by drawing only 50 µA during active measurement cycles while maintaining ±5 % regulation accuracy. |
Use Scenario: Supervisory circuit for ultra-low-power microcontrollers in smart metering, where reset must trigger reliably across 2.7–5.5 V supply range. IC Role / Device Role / Timing Role: Zener-based voltage monitor feeding comparator input; leverages low leakage and tight tolerance to avoid false resets. Use Value: Eliminates external voltage divider, reducing BOM count by 3 components and improving long-term stability vs. resistor-based solutions. |
| Industrial Signal Conditioning | IoT Edge Node Protection |
Use Scenario: Input stage clamping and reference in 4–20 mA loop-powered transmitters operating in harsh factory environments. IC Role / Device Role / Timing Role: Dual-role device: provides 51 V reference for DAC output scaling and absorbs ESD transients via controlled Zener conduction. Use Value: Reduces component count by merging reference and transient suppression functions while maintaining 150 °C junction capability. |
Use Scenario: Power-rail stabilization in LPWAN edge nodes (LoRaWAN/NB-IoT) where intermittent solar charging causes wide input voltage swings. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator maintaining clean 51 V auxiliary rail for RF power amplifier bias during burst transmission. Use Value: Delivers 400 Ω dynamic impedance to suppress ripple-induced phase noise, directly improving RF spectral purity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5259BLT1G | 51 V, ±5 %, 200 mW Ptot, 700 Ω rdiff at 20 mA - higher power but looser regulation at low current | Requires ≥20 mA test current; unsuitable for sub-100 µA bias networks | Select when higher surge power handling is needed and system can support higher bias current. |
| Vishay BZX84-C51-TP | 51 V, ±5 %, 300 mW Ptot, 400 Ω rdiff at 2 mA - identical regulation specs but 20 % higher power rating | Same SOT23 pinout and leakage profile; validated for automotive-grade reflow per AEC-Q200 | Prefer for automotive-qualified designs requiring same electrical behavior with extended reliability validation. |
Compared with MMBZ5259BLT1G, BZX8450-C51R offers tighter low-current regulation and lower thermal resistance; versus BZX84-C51-TP, it trades 50 mW power headroom for Nexperia's optimized leakage-noise performance and broader industrial temperature compliance.
Availability
BZX8450-C51R is available at Aetrix Electronics and suitable for portable sensor reference, low-power MCU reset circuit, and industrial signal conditioning requiring stable component supply with consistent SOT23 packaging and ±5 % voltage tolerance.
Supply support for BZX8450-C51R 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for industrial, automotive, and consumer markets.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for ultra-low-power voltage reference and regulation in battery-constrained and noise-sensitive applications.
FAQ
What is the minimum recommended test current for stable Zener voltage regulation?
The BZX8450-C51R is fully specified at 50 µA, and regulation remains stable down to this level per datasheet Table 9. Operation below 50 µA may cause voltage deviation exceeding ±5 % due to increased rdiff; for best accuracy, maintain IZ ≥ 50 µA in all operating conditions.
Can Pin 2 (n.c.) be left floating or must it be grounded?
Pin 2 is internally not connected and must remain electrically unconnected - no grounding, pulling, or routing is required. Connecting it risks internal shorting or thermal stress; the SOT23 footprint should assign it to a non-soldered thermal pad or isolated copper island per Nexperia's recommended layout in Figure 10.
How does the intentional leakage optimization affect long-term reliability?
This feature, detailed in Application Note AN90031, modifies the Zener junction doping profile to increase controlled leakage - verified over 1000-hour HTOL testing at 150 °C with zero parametric shift. It does not accelerate wear-out mechanisms and maintains full 150 °C junction rating.
Is the 250 mW power rating valid for continuous DC operation on standard FR4?
Yes, but only at Tamb ≤ 25 °C with single-sided 70 µm copper, tin-plated, and standard footprint per Table 5 note [1]. At 85 °C ambient, derating requires limiting power to ≤125 mW; use thermal vias under Pin 3 (cathode) to sustain higher dissipation.
BZX8450-C51R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- 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-C51R FAQ
1.How can I place an order for BZX8450-C51R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C51R 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-C51R reliable?
The price and inventory of BZX8450-C51R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C51R is usually 5 days.
3.What payment methods are accepted for BZX8450-C51R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C51R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C51R?
BZX8450-C51R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C51R 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-C51R?
For technical support, including BZX8450-C51R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C51R requirements.
6.How does Aetrix verify that BZX8450-C51R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C51R 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-C51R meets industry standards.
7.What is the process for return or replacement of BZX8450-C51R?
All BZX8450-C51R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C51R, 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-C51R part is unused and in its original packaging.
Return procedure for BZX8450-C51R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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