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Nexperia USA Inc. BZX8450-C51VL
- Part No.:
- BZX8450-C51VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C51VL.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,669
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Product details
Overview
BZX8450-C51VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 51 V regulation 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 portable battery-powered sensor nodes and IoT endpoint regulation.
For engineers reviewing the BZX8450-C51VL datasheet, BZX8450-C51VL pinout, BZX8450-C51VL application, or BZX8450-C51VL equivalent, key selection criteria include its 51 V nominal Zener voltage, low 50 µA test current requirement, 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. Its 51 V nominal working voltage (48.0–54.0 V range) is characterized at IZ = 2 mA, with temperature coefficient of +35.7 mV/K and diode capacitance of 40 pF at 0 V.
The BZX8450-C51VL belongs to the "C" tolerance series (±5 %), features intentionally elevated leakage current versus "B" series to improve switching transient response and reduce high-frequency noise - a design choice validated in application note AN90031 for low-bias signal conditioning paths.
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 window for 51 V nominal rail |
| Differential Resistance (rdiff) | 400 Ω max at IZ = 2 mA - determines load regulation error under current variation |
| Reverse Current (IR) | 0.05 µA max at VR = 51 V - enables ultra-low quiescent power in standby mode |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - limits forward conduction loss during polarity-reversal protection |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Thermal Resistance (Rth(j-sp)) | 330 K/W - quantifies junction-to-solder-point thermal path for thermal design margining |
| Diode Capacitance (Cd) | 40 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise coupling and filtering response |
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 −55 °C to +150 °C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected 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 thermal pad required |
| 3 | Cathode (K) | Connected to regulated voltage rail; serves as primary thermal path to PCB copper; requires adequate solder land area |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in micro-power systems where bias current budget is <100 µA |
| Optimized leakage profile | Intentionally elevated IR vs. B-series - reduces switching transients and broadband noise per AN90031 |
| ±5 % voltage tolerance | C-series grading - balances cost and accuracy for non-critical reference applications |
| SOT23 footprint compatibility | Standard 3-pin, 1.9 mm pitch layout - supports automated placement and reflow without custom tooling |
| 150 °C maximum junction temperature | Enables operation in thermally constrained enclosures such as sealed sensor housings or industrial edge nodes |
Applications
| Industrial Sensor Signal Conditioning | IoT Endpoint Voltage Reference |
|---|---|
Use Scenario: Providing stable bias voltage for op-amp input stages in battery-powered pressure/temperature transducers. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise common-mode level for analog front-end amplification. Use Value: 50 µA test current minimizes drain on CR2032 coin cell; ±5 % tolerance meets 12-bit ADC offset stability requirements. |
Use Scenario: Generating fixed reference for ADC measurement in BLE-enabled environmental monitors. IC Role / Device Role / Timing Role: Passive voltage clamp defining upper rail for supply-independent sensor excitation. Use Value: 40 pF capacitance avoids aliasing in 10 kHz sampling; 0.05 µA leakage extends 10-year battery life estimate. |
| Portable Medical Diagnostic Circuitry | Low-Power Microcontroller Reset Supervision |
Use Scenario: Biasing photodiode amplifier in handheld pulse oximeter front-end. IC Role / Device Role / Timing Role: Low-noise Zener reference suppressing EMI-induced baseline drift in analog signal chain. Use Value: Intentional leakage optimization per AN90031 reduces 1/f noise floor below 100 Hz critical for SpO₂ calculation. |
Use Scenario: Monitoring 51 V auxiliary rail in programmable logic controller I/O module. IC Role / Device Role / Timing Role: Overvoltage detection element feeding comparator input for brown-out reset assertion. Use Value: 48–54 V regulation window provides 2 V hysteresis margin against line transients; 250 mW rating withstands 100 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX8450-B51 | ±2 % tolerance (tighter), lower leakage (0.01 µA), higher rdiff (300 Ω), same VZ range | Preferred for precision references requiring tighter initial accuracy and lower noise floor | Select when absolute voltage accuracy > stability under varying load current |
| MMSZ5257ET1G | 51 V nominal, ±5 %, 200 mW Ptot, 500 Ω rdiff, SOD-123 package | Larger footprint; higher thermal resistance; less suitable for dense PCB layouts | Choose only if SOD-123 is already standardized in legacy designs or thermal derating is not critical |
Compared with BZX8450-B51, the C51VL trades initial accuracy for lower-cost manufacturing and enhanced noise performance; compared with MMSZ5257ET1G, it offers superior thermal management and space efficiency in SOT23, making it optimal for next-generation compact, low-power systems.
Availability
BZX8450-C51VL is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, IoT endpoint voltage reference, and portable medical diagnostic circuitry requiring stable component supply across extended production lifecycles.
Supply support for BZX8450-C51VL 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX8450 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for ultra-low-power biasing, voltage clamping, and reference generation in battery-constrained and noise-sensitive applications.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-C51VL has a nominal Zener voltage of 51 V, with a guaranteed working voltage range of 48.0 V to 54.0 V at IZ = 2 mA. Its absolute maximum non-repetitive peak reverse voltage is limited by the 40 W surge rating at 100 µs pulse width, corresponding to ~28 V at 100 µs per Fig. 1 - sustained operation must remain within the 48–54 V regulation band.
Can this Zener diode be used in series for higher voltage regulation?
No - the BZX8450-C51VL is not characterized or qualified for series connection. Its leakage current profile, thermal coupling, and tolerance stacking introduce unpredictable regulation behavior. For >51 V references, use a single higher-voltage Zener (e.g., BZX8450-C62) or a dedicated voltage reference IC with guaranteed tracking and thermal compensation.
How does the "n.c." pin affect PCB layout and thermal design?
Pin 2 is internally not connected and must remain unconnected on the PCB. It requires no solder mask opening, thermal relief, or copper pour. Leaving it floating avoids unintended parasitic capacitance or ground loops; routing traces near it does not impact thermal performance, as heat flows exclusively through pins 1 (anode) and 3 (cathode), with cathode being the dominant thermal path (Rth(j-sp) = 330 K/W).
Is this part suitable for automotive applications?
No - the BZX8450-C51VL is not automotive-qualified. It lacks AEC-Q200 stress testing, extended temperature validation beyond −55 °C to +150 °C, and PPAP documentation. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for safety-critical or life-support systems; use only in commercial or industrial environments with appropriate system-level fault mitigation.
BZX8450-C51VL 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:
- 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-C51VL FAQ
1.How can I place an order for BZX8450-C51VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C51VL 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-C51VL reliable?
The price and inventory of BZX8450-C51VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C51VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C51VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C51VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C51VL?
BZX8450-C51VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C51VL 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-C51VL?
For technical support, including BZX8450-C51VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C51VL requirements.
6.How does Aetrix verify that BZX8450-C51VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C51VL 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-C51VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C51VL?
All BZX8450-C51VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C51VL, 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-C51VL part is unused and in its original packaging.
Return procedure for BZX8450-C51VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C51VL 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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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