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Nexperia USA Inc. BZX8450-C33R
- Part No.:
- BZX8450-C33R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C33R.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,008
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Product details
Overview
BZX8450-C33R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in portable electronics. It delivers a nominal 33 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and 325 Ω differential resistance at 5 mA. It is used in battery-powered sensor signal conditioning circuits requiring stable low-power reference.
For engineers reviewing the BZX8450-C33R datasheet, BZX8450-C33R pinout, BZX8450-C33R application, or BZX8450-C33R equivalent, key selection criteria include its 33 V nominal Zener voltage, low 50 µA test current, SOT23 footprint compatibility, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable DC voltage across its cathode–anode terminals under varying load and supply conditions. Its specified regulation at 50 µA enables ultra-low quiescent current operation, critical for energy-constrained devices.
The device features two tolerance series (±2 % and ±5 %), with the "C" suffix denoting the ±5 % variant. Its thermal resistance from junction to ambient is 500 K/W on FR4 PCB, and it exhibits a positive temperature coefficient of +25 mV/K at 33 V, supporting predictable drift behavior in temperature-varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.35 V to 34.65 V at IZ = 50 µA - defines tight regulation window for reference stability |
| Differential Resistance (rdiff) | 325 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation (Ptot) | 250 mW max at Tamb ≤ 25 °C - sets maximum continuous operating power on standard FR4 PCB |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - ensures low loss during forward conduction in protection or clamping roles |
| Reverse Current (IR) | 0.05 µA max at VR = 25.4 V - confirms minimal leakage below knee voltage, critical for standby power integrity |
| Temperature Coefficient (SZ) | +25 mV/K - quantifies voltage drift per degree Celsius, enabling thermal error budgeting in precision references |
| Diode Capacitance (Cd) | 45 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise coupling and AC bypass performance |
Pinout & Package
Package: SOT23 plastic surface-mount package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask opening required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks without loading source |
| Optimized leakage profile | Intentional minor rise in leakage current - reduces switching noise and improves transient response in feedback paths |
| Tight voltage tolerance | ±5 % (C-series) - balances cost and accuracy for non-critical reference applications |
| Thermal robustness | 150 °C max junction temperature - supports reliable operation in compact, thermally constrained layouts |
| Standardized SMT footprint | SOT23 package - ensures compatibility with automated assembly and widely supported reflow profiles |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in wearable health monitors. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed bias point for sensor bridge circuitry. Use Value: 50 µA test current minimizes battery drain while maintaining 33 V reference accuracy within ±5 % over temperature. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in IoT environmental data loggers. IC Role / Device Role / Timing Role: Precision DC reference source for analog-to-digital conversion accuracy. Use Value: 325 Ω dynamic impedance ensures <0.1 % reference error under 100 µA load variation typical of internal ADC reference buffers. |
| USB-C Power Negotiation Clamp | Industrial PLC Input Protection |
Use Scenario: Clamping CC line voltage during USB-C port detection and power role negotiation. IC Role / Device Role / Timing Role: Overvoltage clamp limiting CC pin to safe 33 V level during hot-plug transients. Use Value: 40 W non-repetitive peak power rating absorbs short-duration surges without failure, preserving communication integrity. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-wiring faults. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator absorbing induced transients on industrial I/O lines. Use Value: 0.05 µA max reverse leakage at 25.4 V prevents false triggering in high-impedance input stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BS-7-F | 33 V, ±5 %, SOT23, but rated at 20 mA test current and 350 mW Ptot | Higher power handling; less suitable for sub-100 µA bias networks due to higher minimum operating current | Select when higher surge immunity or >1 mA load current is required; avoid where ultra-low quiescent current is mandatory |
| BZX84-C33 | Same 33 V/±5 % spec, but older BZX84 series with 350 mW rating and no intentional leakage optimization | Lacks AN90031 noise-reduction design; higher capacitance (60 pF vs. 45 pF) limits HF performance | Acceptable for cost-sensitive, non-noise-critical applications; not recommended for precision analog front-ends |
Compared with BZX8450-C33R, MMBZ5267BS-7-F offers greater surge resilience but sacrifices low-current regulation fidelity, while BZX84-C33 matches voltage spec but lacks optimized leakage and noise behavior-making the BZX8450-C33R uniquely suited for battery-powered, noise-sensitive reference designs.
Availability
BZX8450-C33R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC referencing, and industrial I/O protection requiring stable component supply across production volumes and long-lifecycle programs.
Supply support for BZX8450-C33R 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, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding stable voltage references at microamp-level operating currents.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C33R?
The BZX8450-C33R begins regulating at its nominal Zener voltage of 33 V, with guaranteed breakdown between 31.35 V and 34.65 V at 50 µA test current. Below 31.35 V, reverse leakage remains ≤0.05 µA at 25.4 V, confirming sharp knee behavior essential for clean voltage clamping.
Can BZX8450-C33R be used in forward conduction mode?
Yes-it functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at 10 mA. However, its primary design intent is reverse-bias Zener regulation; forward use is limited to low-current protection or indicator roles, not power rectification due to 200 mA absolute max forward current rating.
How does the "n.c." pin affect PCB layout?
Pin 2 is internally not connected and must remain electrically floating-no trace, pad, or solder mask opening should contact it. Standard SOT23 footprints accommodate this; routing near Pin 2 requires ≥0.2 mm clearance to prevent accidental shorts or solder bridging during reflow.
Is BZX8450-C33R suitable for automotive applications?
No-this device is not AEC-Q200 qualified or tested for automotive temperature ranges (−40 °C to +125 °C). Its specified operating ambient range is −55 °C to +150 °C, but qualification data, reliability testing, and PPAP documentation are absent per Nexperia's legal disclaimers and product status classification.
BZX8450-C33R 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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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-C33R FAQ
1.How can I place an order for BZX8450-C33R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C33R 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-C33R reliable?
The price and inventory of BZX8450-C33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C33R is usually 5 days.
3.What payment methods are accepted for BZX8450-C33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C33R?
BZX8450-C33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C33R 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-C33R?
For technical support, including BZX8450-C33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C33R requirements.
6.How does Aetrix verify that BZX8450-C33R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C33R 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-C33R meets industry standards.
7.What is the process for return or replacement of BZX8450-C33R?
All BZX8450-C33R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C33R, 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-C33R part is unused and in its original packaging.
Return procedure for BZX8450-C33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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