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Nexperia USA Inc. BZX8450-B20-QR
- Part No.:
- BZX8450-B20-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B20-QR.pdf
- Description:
- DIODE ZENER 20V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,376
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Product details
Overview
BZX8450-B20-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 20 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW power dissipation, and AEC-Q101 qualification for automotive bias and reference applications.
For engineers reviewing the BZX8450-B20-QR datasheet, BZX8450-B20-QR pinout, BZX8450-B20-QR application, or BZX8450-B20-QR equivalent, this device serves as a precision low-power voltage reference in battery-powered sensors, ECU voltage monitoring, and portable instrumentation where stable low-current regulation is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 19.6 V to 20.4 V at IZ = 50 µA, exhibiting a differential resistance of 225 Ω at IZ = 5 mA and a temperature coefficient of +0.05 mV/K. Its low 50 µA test current enables minimal quiescent current draw in standby circuits.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise, and is qualified to AEC-Q101 for operation across −55 °C to +150 °C ambient temperature range with junction temperature up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 20 V (19.6 V min / 20.4 V max at IZ = 50 µA; enables precise low-bias voltage reference) |
| Tolerance | ±2 % (B-series tight tolerance supports high-accuracy regulation in automotive sensor interfaces) |
| Power Dissipation | 250 mW (max at Tamb ≤ 25 °C on FR4 PCB; defines safe continuous operating envelope) |
| Test Current | 50 µA (low-current specification minimizes loading in ultra-low-power microcontroller reset circuits) |
| Differential Resistance | 225 Ω (at IZ = 5 mA; determines regulation stiffness under varying load conditions) |
| Reverse Leakage | ≤ 0.05 µA at VR = 15.2 V (ensures negligible current drain in standby voltage monitor paths) |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA (supports reliable anode-cathode polarity verification during functional test) |
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) | Positive terminal in forward bias; connected to higher potential in Zener regulation | Must be held at lower potential than cathode to enable reverse breakdown; used for current sourcing into regulated node |
| 2 - n.c. | No connection | Internally unconnected; must remain floating-no PCB trace or thermal pad should attach to this terminal |
| 3 - Cathode (K) | Negative terminal in forward bias; connected to regulated output in Zener configuration | Serves as reference node; ties directly to voltage rail being stabilized; also primary thermal path (Rth(j-sp) = 330 K/W) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per discrete semiconductor stress test standard |
| Low 50 µA test current | Enables use in micropower systems (e.g., coin-cell IoT sensors) without compromising regulation accuracy |
| Optimized leakage profile | Intentional minor leakage per AN90031 improves transient response and reduces broadband noise in feedback paths |
| ±2 % voltage tolerance (B-series) | Reduces need for post-production trimming in precision voltage monitors and ADC reference buffers |
| SOT23 footprint compatibility | Supports automated placement and reflow on high-density PCBs while maintaining thermal performance via cathode tab conduction |
Applications
| Automotive ECU Voltage Monitoring | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Real-time monitoring of 12 V battery rail voltage in engine control units to trigger low-voltage warnings or limp-home mode. IC Role / Device Role / Timing Role: Zener reference providing stable 20 V clamp for comparator input scaling and ADC reference division. Use Value: Tight ±2 % tolerance ensures consistent trip-point accuracy across temperature and lifetime, meeting ISO 16750-2 requirements. |
Use Scenario: Biasing photodiode amplifiers in handheld pulse oximeters powered by single AAA cells. IC Role / Device Role / Timing Role: Low-current voltage reference generating stable 20 V supply for op-amp gain-setting networks. Use Value: 50 µA test current draws <1 µA in standby, extending battery life beyond 12 months between replacements. |
| Industrial PLC Input Protection | Smart Meter Reference Calibration |
Use Scenario: Overvoltage clamping on 24 V digital input channels of programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Fast-acting shunt regulator absorbing surge energy before downstream protection ICs activate. Use Value: Optimized leakage behavior reduces false triggering during EFT bursts while maintaining DC accuracy. |
Use Scenario: Factory calibration reference for 20 V full-scale range in revenue-grade electricity meters. IC Role / Device Role / Timing Role: Primary voltage standard against which internal DAC outputs are trimmed during production test. Use Value: ±2 % initial tolerance and <±0.05 mV/K TC enable <0.1 % total error over −25 °C to +70 °C operating range. |
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-C20-Q | ±5 % tolerance (C-series), higher typical leakage (0.1 µA), same SOT23 package and 20 V nominal rating | Acceptable for non-critical biasing where cost sensitivity outweighs accuracy needs | Select when budget constraints dominate and ±5 % regulation error is acceptable in system-level tolerance stack-up |
| MMSZ5248B-TP | 20 V nominal, ±5 %, 500 mW Ptot, SOD-123 package, no AEC-Q101 qualification | Lacks automotive qualification and optimized leakage profile; higher power handling but larger footprint | Prefer only in industrial non-automotive designs requiring higher power margin and no thermal or reliability certification |
Compared with BZX8450-B20-QR, the BZX84-C20-Q trades accuracy for cost in non-automotive contexts, while MMSZ5248B-TP offers higher power but sacrifices AEC-Q101 compliance and low-noise design-making the BZX8450-B20-QR uniquely suited for safety-aware, low-power automotive voltage references.
Availability
BZX8450-B20-QR is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable medical sensor biasing, and industrial PLC input protection requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX8450-B20-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, analog, and discrete components, with leadership in automotive-qualified devices.
The BZX8450-Q series belongs to Nexperia's automotive-optimized Zener diode product line, designed specifically for low-current, high-stability voltage reference and clamping in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage the BZX8450-B20-QR can withstand before breakdown?
The BZX8450-B20-QR has a nominal Zener voltage of 20 V, with a guaranteed breakdown range of 19.6 V to 20.4 V at 50 µA test current. It is not rated for sustained operation above its specified VZ; exceeding 20.4 V risks entering uncontrolled avalanche or thermal runaway unless current is strictly limited by external series resistance.
Does the 'QR' suffix indicate tape-and-reel packaging?
Yes-the 'QR' suffix denotes that BZX8450-B20-QR is supplied in 3,000-piece 8 mm tape-and-reel format compliant with EIA-481-D standards, optimized for high-speed SMT placement. This differs from 'Q' (bulk) or 'QA' (10,000-piece reel) variants in the same series.
Can this diode be used in forward-bias applications like signal clamping?
No-it is not characterized or guaranteed for forward-bias operation. The datasheet specifies only reverse breakdown parameters (VZ, rdiff, IR) and forward voltage (VF ≤ 0.9 V at 10 mA) as a secondary check parameter. Forward conduction is not a functional mode; use dedicated clamp diodes like PESD series for signal line protection.
How does the 'n.c.' pin affect PCB layout and thermal design?
Pin 2 is internally unconnected and must remain electrically isolated-no copper pour, trace, or thermal relief should contact it. Thermal performance relies solely on pins 1 (anode) and 3 (cathode); the cathode tab provides the dominant thermal path (Rth(j-sp) = 330 K/W), so PCB copper area under pin 3 must be maximized per Nexperia's SOT23 footprint guidelines.
BZX8450-B20-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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.2 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-B20-QR FAQ
1.How can I place an order for BZX8450-B20-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B20-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-B20-QR reliable?
The price and inventory of BZX8450-B20-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-B20-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B20-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B20-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B20-QR?
BZX8450-B20-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B20-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-B20-QR?
For technical support, including BZX8450-B20-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B20-QR requirements.
6.How does Aetrix verify that BZX8450-B20-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B20-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-B20-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B20-QR?
All BZX8450-B20-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B20-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-B20-QR part is unused and in its original packaging.
Return procedure for BZX8450-B20-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B20-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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