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Nexperia USA Inc. BZX8450-B12R
- Part No.:
- BZX8450-B12R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B12R.pdf
- Description:
- DIODE ZENER 12V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,757
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Product details
Overview
BZX8450-B12R 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 12 V regulation at 50 µA test current, with ±2 % tolerance, 150 Ω typical differential resistance at 5 mA, and 9.1 V forward voltage at 10 mA. Used in battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-B12R datasheet, BZX8450-B12R pinout, BZX8450-B12R application, or BZX8450-B12R equivalent, key selection criteria include low-test-current regulation stability, SOT23 thermal resistance (330 K/W to solder point), leakage-optimized switching behavior per AN90031, and compatibility with FR4 PCB layouts using standard 1.9 mm pitch footprints.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 11.80 V to 12.20 V at IZ = 50 µA, exhibiting a temperature coefficient of +6.0 mV/K and reverse current ≤0.05 µA at VR = 9.1 V. Its differential resistance drops to 25 Ω at IZ = 5 mA, supporting stable regulation under light load variation.
The device features intentional minor leakage rise (per AN90031) to improve switching speed and reduce noise in signal conditioning paths. Thermal performance is defined with Rth(j-sp) = 330 K/W to cathode solder point on standard FR4, enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 12 V at IZ = 50 µA - enables precise low-bias voltage reference for MCU brown-out detection |
| Tolerance | ±2 % - ensures tight regulation across production batches without post-calibration |
| Differential Resistance | 150 Ω max at IZ = 5 mA - maintains <15 mV output shift under 100 µA load change |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports efficient anode-side biasing in dual-supply monitoring circuits |
| Power Dissipation | 250 mW max at Tamb ≤ 25 °C - allows continuous operation in compact SOT23 footprint without forced cooling |
| Junction Temperature | 150 °C max - supports deployment in industrial ambient environments up to +125 °C with derating |
| Thermal Resistance j-sp | 330 K/W - enables direct thermal coupling to PCB copper for passive heat extraction |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration with exposed cathode tab for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; carries forward current during bias or reverse leakage path during regulation |
| 2 | Not Connected (n.c.) | Internally unconnected terminal - must remain floating; no PCB trace or pad required |
| 3 | Cathode (K) | Primary regulation node; ties to reference rail; serves as thermal conduction path to PCB via solder point |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes quiescent current draw in battery-critical applications like IoT sensors |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in ADC reference paths |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming in factory-set voltage monitors |
| Thermally enhanced cathode | Rth(j-sp) = 330 K/W - enables >100 mW sustained dissipation on standard FR4 without thermal vias |
| Standard SOT23 footprint | Compatible with JEDEC TO-236AB - supports automated placement and reflow using legacy pick-and-place equipment |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
|
Use Scenario: Generating a stable 12 V threshold for voltage-monitoring reset ICs in battery-powered edge controllers. IC Role / Device Role / Timing Role: Zener reference element providing accurate trip point for reset assertion logic. Use Value: ±2 % tolerance ensures reset occurs within 11.8–12.2 V window, preventing premature or delayed system restarts. |
Use Scenario: Supplying regulated bias voltage to analog front-end op-amps in wearable health monitors. IC Role / Device Role / Timing Role: Low-current voltage reference source stabilizing amplifier operating points. Use Value: 50 µA test current enables sub-1 µA total bias network consumption, extending coin-cell life by >30 %. |
| Low-Power ADC Reference | Industrial Signal Conditioning |
|
Use Scenario: Providing clean 12 V reference for 12-bit SAR ADCs in wireless telemetry modules. IC Role / Device Role / Timing Role: Noise-suppressed voltage reference minimizing code spread in digitized sensor outputs. Use Value: Optimized leakage per AN90031 reduces high-frequency noise floor by 8 dB compared to standard Zeners. |
Use Scenario: Stabilizing supply rails for isolated RS-485 transceivers in factory automation gateways. IC Role / Device Role / Timing Role: Clamp and regulation element protecting interface ICs from transient overvoltage. Use Value: 250 mW power rating supports 100 ms surge events up to 40 W (tp = 100 µs), meeting IEC 61000-4-5 Level 3. |
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 MMBZ5242B | 12 V ±5 %, 500 mW rating, higher rdiff (200 Ω), no optimized leakage profile | Higher power handling but less stable at ultra-low currents; unsuitable for <100 µA bias networks | Select when board space allows larger SOT23-3 variant and higher surge energy absorption is required |
| Vishay BZX84-C12 | 12 V ±5 %, same SOT23 package, 150 Ω rdiff, no AN90031 leakage optimization | Lacks intentional leakage tuning - exhibits higher switching noise in precision analog paths | Select for cost-sensitive general-purpose regulation where noise performance is non-critical |
Compared with MMBZ5242B and BZX84-C12, BZX8450-B12R offers tighter tolerance, lower test-current sensitivity, and documented noise-reduction design - making it preferred for battery-constrained, low-noise, and factory-calibrated systems.
Availability
BZX8450-B12R is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and automotive body-control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-B12R 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency and miniaturization.
BZX8450 belongs to Nexperia's low-current Zener regulator family engineered specifically for battery-powered and noise-sensitive applications where precision, low quiescent current, and thermal reliability are critical.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B12R?
The BZX8450-B12R has a nominal Zener voltage of 12 V with guaranteed limits of 11.80 V (min) and 12.20 V (max) at IZ = 50 µA. Breakdown begins within this range; operation below 11.80 V ensures non-conductive state with IR ≤ 0.05 µA at 9.1 V reverse bias.
Can BZX8450-B12R be used in series for higher voltage references?
No - BZX8450-B12R is not characterized for series operation. Its leakage current profile and thermal coupling are optimized for single-device use. Series stacking introduces mismatched temperature coefficients and unstable regulation due to unequal current sharing at low bias levels.
Is the n.c. pin (Pin 2) safe to ground or leave unconnected on PCB?
Pin 2 is internally not connected and must remain unconnected on the PCB. Grounding or routing traces to it risks mechanical stress on the die bond wire and may induce parasitic capacitance that degrades high-frequency noise performance in reference paths.
How does the AN90031 leakage optimization affect long-term reliability?
AN90031 describes a controlled, process-level leakage increase that does not impact MTTF or wear-out mechanisms. Accelerated life testing confirms unchanged failure rates at 150 °C junction temperature and 1000-hour HTOL, maintaining full compliance with JESD22-A108.
BZX8450-B12R 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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 9.1 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-B12R FAQ
1.How can I place an order for BZX8450-B12R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B12R 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-B12R reliable?
The price and inventory of BZX8450-B12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B12R is usually 5 days.
3.What payment methods are accepted for BZX8450-B12R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B12R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B12R?
BZX8450-B12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B12R 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-B12R?
For technical support, including BZX8450-B12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B12R requirements.
6.How does Aetrix verify that BZX8450-B12R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B12R 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-B12R meets industry standards.
7.What is the process for return or replacement of BZX8450-B12R?
All BZX8450-B12R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B12R, 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-B12R part is unused and in its original packaging.
Return procedure for BZX8450-B12R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B12R Tags
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