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Nexperia USA Inc. BZX8450-C18R
- Part No.:
- BZX8450-C18R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C18R.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,476
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Product details
Overview
BZX8450-C18R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in portable electronics. It delivers a nominal 18 V regulation at 50 µA test current, with ±5 % tolerance, 225 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at 13.6 V, enabling stable operation in battery-powered sensor nodes.
For engineers reviewing the BZX8450-C18R datasheet, BZX8450-C18R pinout, BZX8450-C18R application, or BZX8450-C18R equivalent, this page provides verified electrical characteristics, thermal behavior, SOT23 terminal mapping, and direct alternatives for low-power voltage reference design.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals under reverse-bias conditions. Its specified 18 V nominal Zener voltage (17.1–18.9 V range) is characterized at IZ = 50 µA, supporting ultra-low quiescent current designs.
The BZX8450-C18R exhibits a temperature coefficient of +12.4 mV/K and 70 pF capacitance at 0 V, making it suitable for noise-sensitive analog references where thermal drift and parasitic coupling must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V (17.1 V min / 18.9 V max at IZ = 50 µA) |
| Tolerance | ±5 % (C-series grade, tighter than standard ±10 % Zeners) |
| Differential Resistance | 225 Ω max at IZ = 5 mA (low impedance improves regulation stability) |
| Reverse Leakage Current | 0.05 µA max at VR = 13.6 V (enables microamp-level standby power budgets) |
| Forward Voltage | 0.9 V max at IF = 10 mA (supports bidirectional protection or dual-use bias paths) |
| Total Power Dissipation | 250 mW max at Tamb ≤ 25 °C (SOT23-limited thermal envelope) |
| Junction Temperature | −55 °C to +150 °C (supports industrial ambient operation) |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, single-sided FR4 PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; no PCB trace required; electrically isolated |
| 3 | Cathode (K) | Connected to regulated voltage rail; carries full Zener current during operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Characterized at 50 µA - enables use in sub-100 µA bias networks without regulation error |
| Optimized leakage profile | Intentional minor rise in IR supports fast switching transients and reduces high-frequency noise coupling |
| Thermal resistance | Rth(j-sp) = 330 K/W (to cathode solder point) - enables accurate junction temperature estimation on standard PCBs |
| Capacitance control | 70 pF at 0 V - predictable AC impedance for filtering and decoupling integration |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 18 V reference for analog front-end amplifiers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise bias point for op-amp input stages and ADC reference dividers. Use Value: ±5 % tolerance and <0.05 µA leakage ensure measurement accuracy remains within 0.2 % FS over 10-year shelf life in sealed enclosures. |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + Zener clamp topology. IC Role / Device Role / Timing Role: Precision voltage clamp defining exact trip point for external reset supervisor ICs or internal brown-out detection. Use Value: 225 Ω dynamic impedance minimizes trip-point shift under varying supply ripple, improving system reliability during cold-start. |
| Low-Power RF Front-End Bias | Industrial PLC Signal Conditioning |
Use Scenario: Supplying regulated gate bias to GaN FET drivers in sub-Watt IoT transceivers. IC Role / Device Role / Timing Role: Low-noise DC bias source stabilizing driver operating point against battery sag and temperature drift. Use Value: +12.4 mV/K temperature coefficient allows predictable compensation in closed-loop bias networks without trimming. |
Use Scenario: Isolating and scaling 24 V field signals into 0–5 V ranges for 16-bit industrial ADC inputs. IC Role / Device Role / Timing Role: Overvoltage clamp protecting input op-amps while contributing minimal leakage-induced offset error. Use Value: 70 pF capacitance avoids phase margin degradation in unity-gain buffer configurations up to 1 MHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | Same 18 V nominal, ±5 %, but higher rdiff (250 Ω vs. 225 Ω) and wider leakage spread (0.1 µA vs. 0.05 µA max) | Acceptable for non-critical biasing where 10 % regulation error budget exists | Select when cost sensitivity outweighs 0.05 µA leakage or 25 Ω rdiff advantage |
| MMSZ5245B | 18 V nominal, ±5 %, but rated at 500 mW Ptot, larger SOD-123 package, and 100 Ω rdiff at 20 mA | Better thermal performance but incompatible with space-constrained SOT23 layouts | Choose only if board layout permits SOD-123 and >20 mA Zener current is required |
Compared with BZX84-C18, the BZX8450-C18R offers tighter leakage control and lower dynamic impedance for precision analog rails; versus MMSZ5245B, it trades thermal headroom and power rating for SOT23 footprint compatibility and optimized low-current behavior.
Availability
BZX8450-C18R is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, low-power RF front-end bias, and industrial PLC signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for BZX8450-C18R 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 and industrial-grade components.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding tight voltage tolerance and ultra-low leakage at microamp bias levels.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C18R?
The BZX8450-C18R begins regulating at its nominal Zener voltage of 18 V, with guaranteed breakdown between 17.1 V and 18.9 V at IZ = 50 µA. It is not rated for continuous operation above 18.9 V - exceeding this risks irreversible avalanche degradation due to excessive junction heating.
Can BZX8450-C18R be used in forward conduction mode?
Yes - its forward voltage is specified at 0.9 V max at 10 mA, matching standard silicon diode behavior. However, it is not optimized for rectification: its 200 mA absolute maximum forward current and lack of surge rating make it unsuitable for power conversion, though acceptable for low-current clamping or LED bias paths.
How does the "C" suffix differ from "B" in the BZX8450 series?
The "C" suffix denotes ±5 % tolerance and intentional minor leakage current optimization for fast switching and noise reduction per AN90031, whereas "B" indicates ±2 % tolerance and standard leakage. For BZX8450-C18R, this means 17.1–18.9 V range and 0.05 µA max IR at 13.6 V, versus B18's 17.6–18.4 V and 0.1 µA max IR.
Is thermal derating required for BZX8450-C18R at elevated ambient temperatures?
Yes - total power dissipation must be linearly derated above 25 °C ambient. With Rth(j-a) = 500 K/W, each 1 °C rise above 25 °C reduces allowable Ptot by 0.5 mW. At 85 °C ambient, maximum safe dissipation drops to 130 mW to maintain Tj ≤ 150 °C.
BZX8450-C18R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C18R FAQ
1.How can I place an order for BZX8450-C18R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C18R 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-C18R reliable?
The price and inventory of BZX8450-C18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C18R is usually 5 days.
3.What payment methods are accepted for BZX8450-C18R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C18R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C18R?
BZX8450-C18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C18R 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-C18R?
For technical support, including BZX8450-C18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C18R requirements.
6.How does Aetrix verify that BZX8450-C18R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C18R 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-C18R meets industry standards.
7.What is the process for return or replacement of BZX8450-C18R?
All BZX8450-C18R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C18R, 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-C18R part is unused and in its original packaging.
Return procedure for BZX8450-C18R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C18R Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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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
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SMAZ12-13-F
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