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Nexperia USA Inc. BZX8450-B12-QR
- Part No.:
- BZX8450-B12-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B12-QR.pdf
- Description:
- DIODE ZENER 12V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,272
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Product details
Overview
BZX8450-B12-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers 12 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW power dissipation, and AEC-Q101 qualification.
For engineers reviewing the BZX8450-B12-QR datasheet, BZX8450-B12-QR pinout, BZX8450-B12-QR application, or BZX8450-B12-QR equivalent, this page provides verified electrical characteristics, thermal behavior, automotive qualification status, and real-world use context for low-power voltage stabilization.
Technical Context
This device operates as a reverse-biased Zener diode with a nominal breakdown voltage of 12 V at IZ = 50 µA, exhibiting a differential resistance of ≤150 Ω at IZ = 5 mA and a temperature coefficient of +6.0 mV/K. Its leakage current is limited to ≤0.05 µA at VR = 11 V.
Designed for low-bias operation, it features intentional minor leakage optimization per AN90031 to improve switching speed and reduce noise. Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, supporting stable performance in compact automotive ECUs and battery-powered sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 12 V at IZ = 50 µA - precise reference for low-current bias networks |
| Tolerance | ±2 % (B-series) - enables tight voltage margin control in safety-critical circuits |
| Power Dissipation | 250 mW at Tamb ≤ 25 °C - supports continuous operation in thermally constrained SMT layouts |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - ensures minimal conduction loss during forward bias |
| Junction Temperature | −55 °C to +150 °C - validated for under-hood automotive environments |
| AEC-Q101 Qualified | Yes - meets stress-test requirements for discrete semiconductors in automotive applications |
| Package | SOT23 - 3-terminal surface-mount footprint (2.9 mm × 1.3 mm × 1.0 mm) compatible with standard reflow processes |
Pinout & Package
SOT23 plastic surface-mount package with 1.9 mm lead pitch, 2.9 mm × 1.3 mm × 1.0 mm body dimensions, and tin-plated terminations for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; must be held at voltage ≤ cathode minus VZ |
| 2 | Not Connected (n.c.) | Internally unconnected; no PCB trace or solder pad required - reduces routing complexity and parasitic coupling |
| 3 | Cathode (K) | Connects to higher-potential node; carries regulated output voltage referenced to anode; serves as primary thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level standby circuits without compromising regulation accuracy |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and high-frequency noise in sensor bias rails |
| Automotive qualification | AEC-Q101 compliant - qualified for engine control modules, body electronics, and ADAS subsystems |
| Thermal performance | Rth(j-sp) = 330 K/W - efficient heat transfer from junction to cathode solder point improves long-term reliability |
| Stable temperature coefficient | +6.0 mV/K at 12 V - predictable drift behavior simplifies compensation in wide-temperature-range designs |
Applications
| Automotive Cabin Sensor Bias | Portable Medical Device Reference |
|---|---|
|
Use Scenario: Powering analog front-end of cabin temperature/humidity sensors in HVAC control units. IC Role / Device Role / Timing Role: Provides stable 12 V reference for ADC input scaling and op-amp biasing. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure consistent sensor calibration across −40 °C to +125 °C operating range. |
Use Scenario: Generating precision bias voltage for low-power ECG amplifier stages in wearable monitors. IC Role / Device Role / Timing Role: Acts as low-current Zener shunt regulator for ultra-low-quiescent LDO input stage. Use Value: 50 µA test current enables operation from coin-cell batteries while maintaining <0.1 % line regulation error. |
| Industrial IoT Node Voltage Clamp | Automotive LED Driver Feedback |
|
Use Scenario: Clamping supply rail of LoRaWAN edge node MCU during transient overvoltage events. IC Role / Device Role / Timing Role: Shunt regulator limiting VDD to 12 V during surge conditions. Use Value: 40 W non-repetitive peak power rating (tp = 100 µs) absorbs brief load-dump spikes without failure. |
Use Scenario: Setting feedback threshold in constant-current LED driver for interior lighting modules. IC Role / Device Role / Timing Role: Precision voltage reference for current-sense comparator input. Use Value: +6.0 mV/K tempco matches LED forward-voltage drift, minimizing brightness variation over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12 | ±5 % tolerance, no AEC-Q101 qualification, same SOT23 package | Targeted at industrial/commercial rather than automotive systems | Select when cost sensitivity outweighs automotive compliance and tighter tolerance requirements |
| MMSZ5242B | 12 V ±5 %, 500 mW Ptot, higher power but larger SOD-123 footprint | Used where higher surge energy handling is needed and board space permits larger package | Choose for non-automotive applications requiring >250 mW continuous dissipation or higher surge robustness |
Compared with BZX8450-B12-QR, BZX84-C12 sacrifices automotive qualification and precision for lower cost, while MMSZ5242B trades SOT23 miniaturization for higher power capability - making the BZX8450-B12-QR optimal for space-constrained, AEC-Q101–mandated 12 V reference designs.
Availability
BZX8450-B12-QR is available at Aetrix Electronics and suitable for automotive electronic control units, portable medical instrumentation, and industrial IoT sensor nodes requiring stable component supply under extended temperature and qualification requirements.
Supply support for BZX8450-B12-QR 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment electronics where AEC-Q101 compliance and tight tolerances are mandatory.
FAQ
What is the maximum reverse voltage the BZX8450-B12-QR can sustain before breakdown?
The nominal Zener voltage is 12 V, with guaranteed minimum and maximum values of 11.40 V and 12.60 V respectively at IZ = 50 µA. Breakdown occurs within this band; operation above 12.60 V risks exceeding specified differential resistance and thermal limits. Absolute maximum reverse voltage is not defined - sustained operation beyond VZ(max) degrades long-term stability.
Can BZX8450-B12-QR replace BZX84-C12 in an existing design?
Yes, electrically and physically - both use SOT23 package with identical pinning (anode-pin1, n.c.-pin2, cathode-pin3). However, BZX8450-B12-QR adds AEC-Q101 qualification and ±2 % tolerance versus ±5 % for BZX84-C12. Replacement is valid if automotive compliance and tighter regulation are required; no layout change is needed.
Why does Pin 2 show 'n.c.' and how should it be handled on the PCB?
Pin 2 is internally not connected - no die bond or metallization links it to the silicon. On the PCB, it must remain unconnected: no copper trace, no solder mask opening, and no thermal pad. Leaving it floating avoids unintended parasitic capacitance or leakage paths that could affect low-current regulation accuracy at 50 µA test conditions.
How does the +6.0 mV/K temperature coefficient impact circuit performance?
The positive temperature coefficient means VZ increases by ~6 mV per °C rise in junction temperature. At 12 V nominal, this yields ~0.05 %/°C drift - predictable and linear, enabling simple software or hardware compensation in closed-loop systems. It also counteracts negative tempcos in adjacent components like LEDs, improving overall system stability.
BZX8450-B12-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B12-QR FAQ
1.How can I place an order for BZX8450-B12-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B12-QR 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-B12-QR reliable?
The price and inventory of BZX8450-B12-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B12-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B12-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B12-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B12-QR?
BZX8450-B12-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B12-QR 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-B12-QR?
For technical support, including BZX8450-B12-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B12-QR requirements.
6.How does Aetrix verify that BZX8450-B12-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B12-QR 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-B12-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B12-QR?
All BZX8450-B12-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B12-QR, 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-B12-QR part is unused and in its original packaging.
Return procedure for BZX8450-B12-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B12-QR Tags
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