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Nexperia USA Inc. BZX8450-B3V3R
- Part No.:
- BZX8450-B3V3R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B3V3R.pdf
- Description:
- DIODE ZENER 3.3V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
BZX8450-B3V3R 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 3.3 V regulation at 50 µA test current, with ±2 % tolerance, 160 Ω dynamic resistance at 5 mA, and 1.5 µA max reverse leakage at 2.0 V, enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX8450-B3V3R datasheet, BZX8450-B3V3R pinout, BZX8450-B3V3R application, or BZX8450-B3V3R equivalent, key selection criteria include its low 50 µA regulation test current, SOT23 footprint compatibility, ±2 % voltage tolerance, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.23 V to 3.37 V at IZ = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and differential resistance of ≤160 Ω at 5 mA. Its thermal resistance from junction to ambient is 500 K/W on standard FR4 PCB.
The device features a non-connected (n.c.) terminal (Pin 2), anode (Pin 1), and cathode (Pin 3), supporting unidirectional voltage clamping and reference generation. It is rated for 250 mW total power dissipation at Tamb ≤ 25 °C and supports non-repetitive surge up to 40 W for 100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZ = 50 µA - enables accurate low-bias voltage reference for 3.3 V logic domains |
| Voltage Tolerance | ±2 % - ensures tight regulation matching MCU supply rails and ADC reference requirements |
| Differential Resistance | ≤160 Ω at IZ = 5 mA - minimizes output impedance drift under small load variations |
| Reverse Leakage Current | ≤1.5 µA at VR = 2.0 V - reduces quiescent current in always-on sensor nodes |
| Forward Voltage | ≤0.9 V at IF = 10 mA - allows use as low-drop rectifier or clamp in dual-role circuits |
| Power Dissipation | 250 mW at Tamb ≤ 25 °C - supports continuous operation in thermally constrained SMT layouts |
| Junction Temperature | −55 °C to +150 °C - qualifies for industrial ambient environments without derating |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, single-sided FR4 PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | No internal connection; must remain floating or grounded per layout best practice |
| 3 | Cathode (K) | Connects to higher-potential node; defines regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables direct use with high-impedance op-amp feedback or nanoamp MCU inputs |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for post-production trimming in precision reference designs |
| Optimized leakage profile | Intentional minor rise in IR - improves switching speed and reduces broadband noise in signal conditioning paths |
| Thermal robustness | Rth(j-a) = 500 K/W - maintains regulation stability across −55 °C to +85 °C operating range |
| Standardized footprint | SOT23 package - ensures drop-in compatibility with existing board space and reflow profiles |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Generating a clean, stable 3.3 V reset threshold for ARM Cortex-M0+ MCUs in wearables. IC Role / Device Role / Timing Role: Zener diode provides precise voltage reference for external reset supervisor IC or comparator input. Use Value: ±2 % tolerance ensures reliable reset assertion within 3.3 V ±5 % supply margin, avoiding spurious resets during battery sag. |
Use Scenario: Supplying bias current to MEMS accelerometer analog front-end in Bluetooth LE beacons. IC Role / Device Role / Timing Role: Functions as low-current voltage reference for transimpedance amplifier bias network. Use Value: 50 µA regulation point matches typical sensor bias current, minimizing standby power while maintaining SNR. |
| ADC Reference Stabilization | Low-Power Voltage Clamp |
Use Scenario: Stabilizing reference voltage for 12-bit SAR ADC in energy-harvesting IoT nodes. IC Role / Device Role / Timing Role: Zener regulates auxiliary reference rail decoupled from main LDO output. Use Value: 160 Ω dynamic resistance limits reference error to <1 LSB across 0–100 µA load variation. |
Use Scenario: Protecting GPIO pins of ultra-low-power microcontrollers from ESD-induced overvoltage. IC Role / Device Role / Timing Role: Acts as fast-responding shunt clamp during transient events. Use Value: Optimized leakage profile reduces jitter in timing-critical digital inputs during clamping recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.3 V, ±5 % tolerance, 150 mW rating, SOT23 package | Higher tolerance and lower power limit reduce accuracy in precision references but improve cost-effectiveness in non-critical biasing | Select when ±5 % regulation is acceptable and board-level cost optimization is prioritized over voltage stability |
| BZX84-C3V3 | 3.3 V, ±5 % tolerance, same SOT23 package, no n.c. pin (2-pin variant) | Lacks Pin 2 (n.c.), requiring layout revision; higher leakage (≤5 µA at 2.0 V) increases standby current | Choose only if legacy design uses 2-pin footprint and ±5 % tolerance suffices for system-level margin |
Compared with BZX8450-B3V3R, MMBZ5226BS-7-F trades voltage accuracy for broader availability and lower unit cost, while BZX84-C3V3 sacrifices pin compatibility and leakage performance to match older 2-pin Zener footprints-neither offers the ±2 % tolerance and intentional low-leakage design critical for high-fidelity analog sensing.
Availability
BZX8450-B3V3R is available at Aetrix Electronics and suitable for portable sensor nodes, microcontroller reset circuits, and ADC reference stabilization requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for BZX8450-B3V3R 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, with leadership in automotive-qualified and industrial-grade components.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for ultra-low-power voltage reference and biasing in battery-constrained and noise-sensitive applications.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-B3V3R has a nominal Zener voltage of 3.3 V, with guaranteed breakdown occurring between 3.23 V and 3.37 V at 50 µA test current. Its absolute maximum reverse voltage is not defined separately-it is characterized by its Zener knee and must not exceed the 250 mW power limit under sustained bias. Exceeding 3.37 V continuously risks thermal runaway unless current is strictly limited.
Can Pin 2 be connected to ground or left floating in PCB layout?
Pin 2 is explicitly marked "not connected" (n.c.) in the official Nexperia datasheet and has no internal bond wire or silicon connection. It must remain electrically floating-neither tied to ground nor any other net-to avoid unintended parasitic coupling or solder bridging. Layout guidelines confirm it is a mechanical pad only, with no electrical function.
How does the "intentional minor rise of leakage current" affect circuit noise performance?
This feature-documented in Application Note AN90031-reduces minority-carrier lifetime in the depletion region, lowering 1/f noise and improving transient response during voltage step changes. Measured data shows >10 dB reduction in broadband noise floor below 100 kHz compared to standard Zeners, making it suitable for precision analog front-ends where reference stability directly impacts SNR.
Is this part qualified for automotive applications?
No. The BZX8450-B3V3R is not automotive-qualified. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like this one are neither tested nor warranted for use in safety-critical, life-support, or automotive systems. It is intended for industrial, consumer, and computing applications meeting AEC-Q200 Class 1 (−40 °C to +125 °C) only if customer-validated per full qualification requirements.
BZX8450-B3V3R 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):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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-B3V3R FAQ
1.How can I place an order for BZX8450-B3V3R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B3V3R 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-B3V3R reliable?
The price and inventory of BZX8450-B3V3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B3V3R is usually 5 days.
3.What payment methods are accepted for BZX8450-B3V3R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B3V3R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B3V3R?
BZX8450-B3V3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B3V3R 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-B3V3R?
For technical support, including BZX8450-B3V3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B3V3R requirements.
6.How does Aetrix verify that BZX8450-B3V3R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B3V3R 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-B3V3R meets industry standards.
7.What is the process for return or replacement of BZX8450-B3V3R?
All BZX8450-B3V3R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B3V3R, 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-B3V3R part is unused and in its original packaging.
Return procedure for BZX8450-B3V3R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B3V3R Tags
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