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Nexperia USA Inc. BZX8450-B18-QR
- Part No.:
- BZX8450-B18-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B18-QR.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
BZX8450-B18-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in low-power circuits. It delivers a nominal 18 V regulation at 50 µA test current, with ±2 % tolerance, 225 Ω differential resistance at 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8450-B18-QR datasheet, BZX8450-B18-QR pinout, BZX8450-B18-QR application, or BZX8450-B18-QR equivalent, this device is selected for stable low-current regulation in battery-powered sensors, ECU reference rails, and portable instrumentation where leakage-sensitive operation and thermal reliability are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 17.6 V to 18.4 V at IZ = 50 µA. Its temperature coefficient is +12.4 mV/K, indicating positive drift with junction temperature rise, and it exhibits 16 pF capacitance at 0 V reverse bias and 1 MHz.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and noise reduction. It supports continuous forward current up to 200 mA and non-repetitive peak reverse power dissipation of 40 W for 100 µs pulses at Tj = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V (range 17.6 V to 18.4 V at IZ = 50 µA; defines stable regulation point) |
| Tolerance | ±2 % (B-series grade; enables tighter system-level voltage margin control) |
| Differential Resistance | 225 Ω max at IZ = 5 mA (low impedance improves regulation stability under load variation) |
| Power Dissipation | 250 mW max at Tamb ≤ 25 °C on FR4 PCB (sets maximum continuous DC power handling) |
| Reverse Current | 0.05 µA max at VR = 13.6 V (ultra-low leakage preserves battery life in always-on circuits) |
| Forward Voltage | 0.9 V max at IF = 10 mA (enables predictable forward conduction in clamp or protection configurations) |
| Junction Temperature | 150 °C max (supports operation in under-hood automotive environments) |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), qualified per AEC-Q101 for automotive reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; carries forward current when used as rectifier |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint permitted |
| 3 | Cathode (K) | Connects to higher-potential node in reverse-bias regulation; primary terminal for voltage reference output |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA-minimizes quiescent current draw in battery-critical applications |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Optimized leakage profile | Intentional minor IR increase per AN90031 reduces switching noise and improves transient response |
| Thermal resistance | 330 K/W junction-to-solder-point-enables direct thermal path to PCB copper for sustained 250 mW operation |
Applications
| Automotive Body Control Module (BCM) | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Provides stable 18 V reference for microcontroller ADC input scaling and sensor excitation in BCM subassemblies. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse-bias regulation mode. Use Value: ±2 % tolerance and +12.4 mV/K TC ensure consistent analog measurement accuracy across −40 °C to +125 °C ambient range. |
Use Scenario: Supplies regulated bias voltage to electrochemical gas sensing elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current voltage regulator maintaining fixed headroom for analog front-end circuitry. Use Value: 50 µA test current and 0.05 µA max leakage at 13.6 V preserve multi-year battery life in always-on monitoring. |
| Industrial PLC Input Protection | Medical Wearable Power Management |
Use Scenario: Clamps and regulates input signal conditioning stage against overvoltage transients in 24 V industrial I/O modules. IC Role / Device Role / Timing Role: Reverse-bias Zener clamp combined with series resistor for overvoltage limiting. Use Value: 40 W non-repetitive peak power rating handles IEC 61000-4-5 surge events without degradation. |
Use Scenario: Generates precise 18 V rail for ultra-low-noise LDO pre-regulation in implantable telemetry subsystems. IC Role / Device Role / Timing Role: Noise-optimized Zener reference supporting high-resolution data acquisition. Use Value: AN90031 leakage tuning reduces broadband noise floor by >10 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-C18-Q | ±5 % tolerance, higher leakage (0.1 µA at 13.6 V), +12.4 mV/K TC unchanged | Suitable for cost-sensitive non-automotive systems where tighter regulation not required | Select for general-purpose industrial designs where AEC-Q101 is unnecessary and ±5 % tolerance acceptable |
| MMSZ5245B-TP | ±5 % tolerance, 500 mW Ptot, 17 Ω rdiff at 20 mA, no AEC-Q101 qualification | Higher power handling but lacks automotive qualification and low-leakage optimization | Choose only for non-automotive, higher-current applications requiring lower dynamic impedance |
Compared with BZX8450-B18-QR, the BZX84-C18-Q trades regulation accuracy and leakage performance for cost, while MMSZ5245B-TP offers higher power and lower impedance but forfeits automotive qualification and low-current optimization.
Availability
BZX8450-B18-QR is available at Aetrix Electronics and suitable for automotive electronics, portable instrumentation, and industrial sensor interfaces requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX8450-B18-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 energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage reference and regulation in harsh-environment automotive and portable electronics.
FAQ
What is the maximum continuous power dissipation for BZX8450-B18-QR?
The maximum total power dissipation is 250 mW at ambient temperature ≤ 25 °C when mounted on an FR4 PCB with single-sided 70 μm copper and standard SOT23 footprint. Derating is required above 25 °C at 2.0 mW/°C based on Rth(j-a) = 500 K/W.
Is BZX8450-B18-QR suitable for automotive applications?
Yes-this part is fully qualified to AEC-Q101 standards, including stress testing for temperature cycling, high-temperature reverse bias, and ESD robustness. It is explicitly recommended for automotive use in the official Nexperia datasheet Rev. 3 (July 2024).
How does the "B" suffix differ from "C" in the BZX8450-Q series?
The "B" suffix denotes ±2 % tolerance on nominal Zener voltage, while "C" indicates approximately ±5 % tolerance. Both share identical package, thermal specs, and AEC-Q101 qualification, but "B" provides tighter regulation for precision reference applications.
What is the significance of the n.c. (pin 2) in the SOT23 package?
Pin 2 is internally not connected and must remain unconnected on the PCB. Routing a trace or applying solder to this terminal risks mechanical stress, contamination, or unintended parasitic coupling-Nexperia specifies strict floating behavior to maintain specification compliance and long-term reliability.
BZX8450-B18-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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.6 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-B18-QR FAQ
1.How can I place an order for BZX8450-B18-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B18-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-B18-QR reliable?
The price and inventory of BZX8450-B18-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-B18-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B18-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B18-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B18-QR?
BZX8450-B18-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B18-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-B18-QR?
For technical support, including BZX8450-B18-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B18-QR requirements.
6.How does Aetrix verify that BZX8450-B18-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B18-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-B18-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B18-QR?
All BZX8450-B18-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B18-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-B18-QR part is unused and in its original packaging.
Return procedure for BZX8450-B18-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B18-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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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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