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Nexperia USA Inc. BZX8450-C5V1-QR
- Part No.:
- BZX8450-C5V1-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C5V1-QR.pdf
- Description:
- DIODE ZENER 5.1V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
BZX8450-C5V1-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 5.1 V nominal regulation at 50 µA test current, with ±5 % tolerance, 500 Ω differential resistance at 5 mA, and −2.0 mV/K temperature coefficient. Used in ECU sensor signal conditioning and battery-powered microcontroller reset circuits.
For engineers reviewing the BZX8450-C5V1-QR datasheet, BZX8450-C5V1-QR pinout, BZX8450-C5V1-QR application, or BZX8450-C5V1-QR equivalent, key selection criteria include low-test-current regulation stability, AEC-Q101 qualification, SOT23 thermal resistance (330 K/W to solder point), and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown with specified VZ = 4.85 V (min) to 5.36 V (max) at IZ = 50 µA, exhibiting a negative temperature coefficient of −2.0 mV/K. Its differential resistance drops to 60 Ω at IZ = 5 mA, enabling stable regulation under light load variations.
Designed for low-bias operation, it features intentionally elevated leakage current versus standard B-series variants-optimized per AN90031 for faster switching transients and reduced broadband noise in sensor reference paths. Qualified to AEC-Q101, it supports junction temperatures up to 150 °C and ambient ranges from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V - Stable reference voltage at 50 µA test current for low-power bias networks |
| Voltage Tolerance | ±5 % - Tighter than generic Zeners; enables predictable headroom in 5 V rail monitoring |
| Differential Resistance | 500 Ω @ 50 µA / 60 Ω @ 5 mA - Low dynamic impedance ensures minimal output voltage shift under varying load |
| Temperature Coefficient | −2.0 mV/K - Predictable negative drift allows compensation in temperature-stable reference designs |
| Max Power Dissipation | 250 mW @ Tamb ≤ 25 °C - Supports continuous operation in compact SOT23 footprint without forced cooling |
| Junction-to-Solder Thermal Resistance | 330 K/W - Enables reliable heat transfer from cathode tab to PCB copper, critical for automotive thermal cycling |
| Reverse Leakage @ VR = 0 V | 3.7 µA - Intentionally elevated vs. B-series for improved noise performance and transient response |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), qualified for reflow and wave soldering per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in reverse-biased Zener configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or thermal pad connection permitted |
| 3 | Cathode (K) | Reverse-biased terminal; primary heat path to PCB via solder point; ties to regulated voltage node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and ADAS sensor interfaces |
| Low 50 µA test current | Enables use in ultra-low-power systems such as coin-cell IoT sensors and wake-on-event microcontrollers |
| Optimized leakage profile | Elevated IR improves high-frequency noise rejection and reduces settling time in reference buffers |
| SOT23 thermal performance | Rth(j–sp) = 330 K/W enables >100 khr reliability in 85 °C ambient automotive environments |
| Two tolerance options | ±2 % (B-series) and ±5 % (C-series) allow cost/performance trade-off without redesigning PCB layout |
Applications
| Automotive Engine Control Unit (ECU) Sensor Biasing | Portable Medical Pulse Oximeter Reference |
|---|---|
Use Scenario: Providing stable 5.1 V reference for analog front-end amplifiers measuring oxygen saturation signals. IC Role / Device Role / Timing Role: Zener voltage reference supplying excitation voltage to photodiode transimpedance amplifier. Use Value: ±5 % tolerance and −2.0 mV/K TC ensure <±15 mV drift over 0–50 °C operating range, meeting ISO 80601 clinical accuracy requirements. |
Use Scenario: Generating precise bias for low-noise op-amp stages in wearable pulse detection circuitry. IC Role / Device Role / Timing Role: Low-current Zener regulator establishing clean reference for ADC input scaling. Use Value: Optimized leakage minimizes 1/f noise contribution, preserving SNR in sub-10 µV physiological signal chains. |
| Industrial PLC Analog Input Protection | Smart Meter Battery Backup Supervisor |
Use Scenario: Clamping and regulating input voltage to protect 24 V analog input channels from transient overvoltage. IC Role / Device Role / Timing Role: Precision shunt regulator absorbing surge energy while maintaining downstream ADC reference integrity. Use Value: 250 mW power rating and 40 W non-repetitive peak dissipation (100 µs) enable robust Class III surge compliance per IEC 61000-4-5. |
Use Scenario: Monitoring main supply rail and enabling backup battery switchover during brownout events. IC Role / Device Role / Timing Role: Low-quiescent-current voltage detector element in supervisor IC discrete implementation. Use Value: 50 µA test current allows direct connection to Li-ion cell without measurable discharge impact over 10-year meter lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX8450-B5V1-Q | ±2 % tolerance, lower leakage (≤1.0 µA), no intentional leakage optimization | Better DC accuracy but higher 1/f noise; suited for static reference, not fast-signal conditioning | Select when absolute voltage precision outweighs noise performance in low-bandwidth applications |
| MMSZ5231B-TP | ±5 % tolerance, 500 mW Ptot, SOD-123 package, Rth(j–a) = 500 K/W | Larger footprint, higher thermal resistance limits sustained power in confined layouts | Choose only if SOD-123 is already standardized in production; inferior thermal performance in automotive PCBs |
Compared with BZX8450-B5V1-Q, the C5V1-Q trades tighter DC accuracy for lower noise and faster transient response; versus MMSZ5231B-TP, it offers superior thermal coupling and AEC-Q101 validation in identical SOT23 assembly flow.
Availability
BZX8450-C5V1-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC analog input protection, and smart meter battery supervision requiring stable component supply across extended temperature and lifecycle demands.
Supply support for BZX8450-C5V1-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, with leadership in automotive-grade components and advanced packaging.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage reference in automotive and portable electronics where thermal robustness and parametric consistency are critical.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-C5V1-QR has a nominal Zener voltage of 5.1 V with guaranteed minimum of 4.85 V and maximum of 5.36 V at 50 µA. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge rating at 100 µs pulse width-not a fixed VR limit-but sustained reverse bias above 5.36 V will cause uncontrolled conduction and thermal runaway unless current-limited.
Is Pin 2 truly unused, or does it serve a thermal or shielding function?
Pin 2 is internally not connected (n.c.) per Nexperia's official pinning diagram and package outline. It carries no electrical or thermal function. PCB layout must leave it unconnected-no trace, solder mask opening, or thermal relief-to prevent unintended parasitic coupling or mechanical stress on the die attach.
How does the "intentional minor rise of leakage current" improve noise performance?
Per Application Note AN90031, the elevated leakage in C-series devices reduces carrier trapping effects in the depletion region, lowering 1/f flicker noise and improving high-frequency impedance stability. Measured reverse current is 3.7 µA at VR = 0 V, enabling cleaner references in audio and sensor signal chains versus standard B-series equivalents.
Can this diode be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. The BZX8450-C5V1-QR is rated for 250 mW maximum continuous dissipation; higher power requires a single higher-rated device or active regulation, not parallel stacking.
BZX8450-C5V1-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C5V1-QR FAQ
1.How can I place an order for BZX8450-C5V1-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C5V1-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-C5V1-QR reliable?
The price and inventory of BZX8450-C5V1-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-C5V1-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C5V1-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C5V1-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C5V1-QR?
BZX8450-C5V1-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C5V1-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-C5V1-QR?
For technical support, including BZX8450-C5V1-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C5V1-QR requirements.
6.How does Aetrix verify that BZX8450-C5V1-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C5V1-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-C5V1-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C5V1-QR?
All BZX8450-C5V1-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C5V1-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-C5V1-QR part is unused and in its original packaging.
Return procedure for BZX8450-C5V1-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C5V1-QR Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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