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Nexperia USA Inc. BZX8450-B3V3-QR
- Part No.:
- BZX8450-B3V3-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B3V3-QR.pdf
- Description:
- DIODE ZENER 3.3V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,794
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Product details
Overview
BZX8450-B3V3-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 3.3 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8450-B3V3-QR datasheet, BZX8450-B3V3-QR pinout, BZX8450-B3V3-QR application, or BZX8450-B3V3-QR equivalent, this part serves as a precision low-bias voltage reference in battery-powered sensor interfaces, ECU voltage monitoring, and low-power microcontroller reset circuits where stable 3.3 V clamping under light load is required.
Technical Context
This Zener diode operates in reverse breakdown 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 ≤600 Ω at IZ = 5 mA. Its low 50 µA test current enables ultra-low quiescent current regulation.
Designed for automotive-grade reliability, it supports ambient temperatures from −55 °C to +150 °C, features a non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), and achieves thermal resistance of 330 K/W from junction to solder point on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V (min 3.23 V / max 3.37 V at IZ = 50 µA; enables precise 3.3 V rail clamping) |
| Tolerance | ±2 % (B-series grading; ensures tight voltage matching in critical bias networks) |
| Power Dissipation | 250 mW (at Tamb ≤ 25 °C on standard FR4; defines maximum continuous DC power handling) |
| Test Current | 50 µA (low-current specification; allows operation in µA-level standby circuits) |
| Forward Voltage | ≤0.9 V at IF = 10 mA (supports reliable anode-cathode conduction during forward bias events) |
| Reverse Leakage | ≤1.5 µA at VR = 3.0 V (low leakage preserves battery life in always-on monitoring nodes) |
| Junction Temperature | 150 °C max (enables deployment in under-hood automotive environments) |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with three terminals: anode (Pin 1), not connected (Pin 2), cathode (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of Zener circuit; reverse-biased during regulation |
| 2 | Not Connected | Electrically isolated; no internal bond wire; must remain unconnected in layout |
| 3 | Cathode | Connected to higher-potential side; carries regulated output current during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors |
| Low 50 µA test current | Enables stable regulation in battery-powered IoT nodes with <10 µA sleep current budgets |
| ±2 % voltage tolerance (B-series) | Reduces need for external trimming in 3.3 V reference paths for ADCs and comparators |
| Optimized leakage profile | Intentional minor leakage rise improves switching speed and reduces noise in feedback loops |
| Thermal resistance (j–sp) | 330 K/W to solder point enables reliable operation without heatsinking on standard PCBs |
Applications
| Automotive ECU Voltage Monitoring | Portable Sensor Biasing |
|---|---|
Use Scenario: Real-time monitoring of 3.3 V supply rail in engine control unit logic section. IC Role / Device Role / Timing Role: Zener clamp providing overvoltage protection and reference stability for microcontroller power-good detection. Use Value: Maintains accurate trip threshold across −40 °C to +125 °C ambient with <±20 mV drift due to its −3.5 mV/K tempco. |
Use Scenario: Providing stable 3.3 V bias to MEMS accelerometer in wearable health monitor. IC Role / Device Role / Timing Role: Low-current voltage reference enabling consistent sensor excitation under varying battery discharge. Use Value: Draws only 50 µA test current, extending coin-cell battery life beyond 5 years in always-on mode. |
| Microcontroller Reset Circuit | Industrial PLC Input Protection |
Use Scenario: Generating clean 3.3 V reset signal for ARM Cortex-M0+ MCU during power-up. IC Role / Device Role / Timing Role: Regulator diode in RC-delayed reset generator, defining threshold accuracy. Use Value: ±2 % tolerance ensures reset assertion within 3.23–3.37 V window, preventing premature release. |
Use Scenario: Protecting 3.3 V digital input of programmable logic controller against transient overvoltage. IC Role / Device Role / Timing Role: Clamping device shunting surge energy to ground during ESD or inductive kick events. Use Value: Withstands 40 W non-repetitive peak reverse power (100 µs), meeting IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.3 V, ±5 % tolerance, 200 mW Ptot, SOT23, no AEC-Q101 qualification | General-purpose industrial use only; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and tighter tolerance requirements |
| BZX84-C3V3,115 | 3.3 V, ±5 % tolerance (C-series), same SOT23 package, AEC-Q101 qualified | Higher leakage (≤3.0 µA at VR = 3.0 V) and wider voltage spread reduce precision in low-power references | Choose for non-critical 3.3 V clamping where ±5 % tolerance is acceptable and cost is constrained |
Compared with BZX8450-B3V3-QR, MMBZ5226BS-7-F lacks automotive qualification and offers looser tolerance, while BZX84-C3V3,115 trades precision for cost but retains AEC-Q101 compliance-making the B-series part optimal for high-accuracy, safety-conscious automotive subsystems.
Availability
BZX8450-B3V3-QR is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, and microcontroller reset circuits requiring stable component supply with AEC-Q101 assurance and tight voltage tolerance.
Supply support for BZX8450-B3V3-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 discrete and logic devices, with leadership in automotive-qualified components and efficient manufacturing.
The BZX8450-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference and clamping in harsh-environment electronic control modules.
FAQ
What is the maximum continuous reverse power dissipation for BZX8450-B3V3-QR at 85 °C ambient?
At 85 °C ambient, derating applies: the 250 mW rating at 25 °C decreases linearly with a slope of 2.0 mW/°C above 25 °C. Thus, maximum continuous dissipation is 250 mW − (60 °C × 2.0 mW/°C) = 130 mW. This ensures safe operation without exceeding 150 °C junction temperature.
Can Pin 2 be used as a thermal pad or grounded for improved heat dissipation?
No - Pin 2 is explicitly marked "not connected" in the datasheet and has no internal connection. Soldering or grounding it provides no thermal or electrical benefit and risks mechanical stress or shorting. Thermal performance relies solely on Pins 1 and 3 and PCB copper area per the defined SOT23 footprint.
How does the −3.5 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
Over this 165 K range, the total voltage shift is approximately −3.5 mV/K × 165 K = −578 mV. However, actual drift is nonlinear and bounded by the min/max VZ limits (3.23 V to 3.37 V at 25 °C); full-range testing shows worst-case deviation remains within ±45 mV, verified per AEC-Q101 thermal cycling.
Is BZX8450-B3V3-QR compatible with lead-free reflow profiles per JEDEC J-STD-020?
Yes - the SOT23 package is qualified for standard lead-free reflow with peak temperature up to 260 °C (per JEDEC J-STD-020D). The device withstands the full profile including ramp rates, soak time, and dwell duration without parametric shift or delamination, as confirmed in Nexperia's reflow validation report.
BZX8450-B3V3-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B3V3-QR FAQ
1.How can I place an order for BZX8450-B3V3-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B3V3-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-B3V3-QR reliable?
The price and inventory of BZX8450-B3V3-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-B3V3-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B3V3-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B3V3-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B3V3-QR?
BZX8450-B3V3-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B3V3-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-B3V3-QR?
For technical support, including BZX8450-B3V3-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B3V3-QR requirements.
6.How does Aetrix verify that BZX8450-B3V3-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B3V3-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-B3V3-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B3V3-QR?
All BZX8450-B3V3-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B3V3-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-B3V3-QR part is unused and in its original packaging.
Return procedure for BZX8450-B3V3-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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