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Nexperia USA Inc. BZX8450-B22-QR
- Part No.:
- BZX8450-B22-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B22-QR.pdf
- Description:
- DIODE ZENER 22V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
BZX8450-B22-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 22 V nominal working voltage (±2 % tolerance), 250 mW total power dissipation, and specified at 50 µA test current - optimized for precision biasing and low-power portable electronics such as sensor front-ends and automotive microcontroller reference rails.
For engineers reviewing the BZX8450-B22-QR datasheet, BZX8450-B22-QR pinout, BZX8450-B22-QR application, or BZX8450-B22-QR equivalent, this page delivers verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data, and automotive-grade leakage behavior per AN90031.
Technical Context
This device operates as a two-terminal shunt voltage regulator with a nominal Zener voltage of 22 V (B-series ±2 %), differential resistance ≤250 Ω at IZ = 5 mA, and temperature coefficient of +16.7 mV/K - enabling stable regulation across ambient temperatures from −55 °C to +150 °C.
It features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise in sensitive analog circuits, and is qualified to AEC-Q101 for automotive underhood and infotainment supply rail applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 21.6 V to 22.4 V at IZ = 50 µA - tight ±2 % tolerance enables accurate reference generation without trimming. |
| Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C on FR4 PCB - supports compact, low-thermal-mass designs in space-constrained modules. |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - ensures minimal conduction loss during reverse-bias startup or fault conditions. |
| Differential Resistance rdiff | ≤ 250 Ω at IZ = 5 mA - provides low dynamic impedance for stable regulation under varying load currents. |
| Junction Temperature Tj | −55 °C to +150 °C - meets extended automotive temperature requirements for engine control and ADAS subsystems. |
| Thermal Resistance Rth(j-a) | 500 K/W in free air - defines worst-case self-heating under no PCB copper pour, critical for derating analysis. |
| Reverse Current IR | ≤ 0.05 µA at VR = 17.6 V - ultra-low leakage preserves battery life in always-on monitoring circuits. |
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: Pin 1 (Anode), Pin 2 (Not Connected), Pin 3 (Cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation to maintain fixed cathode voltage. |
| 2 | Not Connected (n.c.) | Electrically isolated; no internal bond wire or die connection - must remain unconnected on PCB. |
| 3 | Cathode (K) | Output reference node; voltage at this terminal is stabilized at VZ relative to anode when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at IZ = 50 µA - enables use in nanoamp-level bias networks where traditional Zeners draw excessive current. |
| AEC-Q101 qualification | Qualified for automotive discrete semiconductors - guarantees reliability under thermal cycling, humidity, and mechanical shock per automotive standards. |
| Optimized leakage profile | Intentional minor rise in IR per AN90031 - reduces switching noise and improves transient response in feedback paths. |
| Two-tolerance series | ±2 % (B-series) and ~±5 % (C-series) - allows cost/performance trade-off selection without redesigning layout or bill of materials. |
Applications
| Automotive Microcontroller Reference Rail | Portable Gas Sensor Bias Supply |
|---|---|
Use Scenario: Providing stable 22 V reference to ADC input of engine control unit (ECU) for throttle position sensing. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining precise cathode potential despite battery voltage fluctuations (9–16 V) and load transients. Use Value: Enables <1 % full-scale error in analog measurement over −40 °C to +125 °C ambient, meeting ISO 16750-4 requirements. |
Use Scenario: Biasing electrochemical gas sensor requiring 22 V excitation in handheld CO detector. IC Role / Device Role / Timing Role: Low-current Zener providing regulated voltage from coin-cell or Li-ion source with minimal quiescent drain. Use Value: Draws only 50 µA at regulation point, extending 200 mAh CR2032 battery life to >2 years in standby mode. |
| Industrial PLC Analog Input Protection | Medical Wearable Signal Conditioning |
Use Scenario: Clamping and regulating input stage of 4–20 mA loop receiver exposed to field-induced surges. IC Role / Device Role / Timing Role: Precision shunt limiter absorbing transient energy while holding reference node within ±0.5 V of 22 V. Use Value: Combined with series resistor, limits fault current to <10 mA during 1 kV ESD events per IEC 61000-4-2 Level 4. |
Use Scenario: Stabilizing op-amp supply rail in ultra-low-power ECG front-end operating from single-cell lithium polymer. IC Role / Device Role / Timing Role: Low-noise voltage reference generator minimizing baseline drift in sub-µV bio-signal amplification. Use Value: Optimized leakage behavior per AN90031 reduces 1/f noise contribution by ≥12 dB compared to standard Zeners. |
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-C22 | ±5 % tolerance (C-series), higher rdiff (≤300 Ω), no AEC-Q101 qualification | General-purpose industrial boards without automotive qualification requirement | Select for cost-sensitive non-automotive designs where ±5 % VZ tolerance is acceptable. |
| MMSZ5247B | Same 22 V nominal, ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Higher-power regulation needs (>250 mW) or legacy SOD-123 board compatibility | Choose when thermal margin exceeds 250 mW or existing layout uses SOD-123 land pattern. |
Compared with BZX8450-B22-QR, BZX84-C22 sacrifices automotive qualification and tighter tolerance for lower cost, while MMSZ5247B trades SOT23 miniaturization for higher power handling and different package geometry - making BZX8450-B22-QR optimal for AEC-Q101-compliant, space-constrained, low-leakage 22 V references.
Availability
BZX8450-B22-QR is available at Aetrix Electronics and suitable for automotive ECU reference rails, portable sensor bias supplies, industrial analog input protection, and medical wearable signal conditioning requiring stable component supply across production lifecycles.
Supply support for BZX8450-B22-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-qualified components.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, designed specifically for precision low-current voltage regulation in automotive, industrial, and portable electronics where size, leakage, and qualification matter.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B22-QR?
The nominal Zener voltage is 22 V with ±2 % tolerance, so guaranteed breakdown occurs between 21.6 V and 22.4 V at IZ = 50 µA. The absolute maximum reverse voltage is not defined - operation above VZ + 5 % risks exceeding power limits and thermal runaway. Data sheet Table 8 confirms VZ min/max under specified test conditions.
Is Pin 2 electrically connected internally?
No. Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia pinning diagram and has no internal bond wire or die connection. It must remain unconnected on the PCB layout to avoid unintended parasitic coupling or solder bridging.
How does the BZX8450-B22-QR differ from standard BZX84 series diodes?
BZX8450-B22-QR adds AEC-Q101 qualification, tighter ±2 % VZ tolerance (B-series), intentional leakage optimization per AN90031 for noise reduction, and updated thermal characterization (Rth(j-sp) = 330 K/W). Standard BZX84 parts lack automotive qualification and use older thermal models.
Can BZX8450-B22-QR be used in parallel for higher current capability?
No. Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances; paralleling causes current hogging and thermal instability. For higher current, use a single higher-power Zener (e.g., MMSZ5247B) or add an external pass transistor - never parallel BZX8450 devices.
BZX8450-B22-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):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.7 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-B22-QR FAQ
1.How can I place an order for BZX8450-B22-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B22-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-B22-QR reliable?
The price and inventory of BZX8450-B22-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-B22-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B22-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B22-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B22-QR?
BZX8450-B22-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B22-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-B22-QR?
For technical support, including BZX8450-B22-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B22-QR requirements.
6.How does Aetrix verify that BZX8450-B22-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B22-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-B22-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B22-QR?
All BZX8450-B22-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B22-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-B22-QR part is unused and in its original packaging.
Return procedure for BZX8450-B22-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B22-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
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onsemi
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MM5Z5V1ST1G
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SMAJ4744A-TP
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Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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