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Nexperia USA Inc. BZX8450-C18-QVL
- Part No.:
- BZX8450-C18-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C18-QVL.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,871
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Product details
Overview
BZX8450-C18-Q 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 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 rated voltage - enabling stable operation in low-power sensor interfaces and ECU power-rail monitoring.
For engineers reviewing the BZX8450-C18-Q datasheet, BZX8450-C18-Q pinout, BZX8450-C18-Q application, or BZX8450-C18-Q equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, thermal resistance data (Rth(j-a) = 500 K/W), and direct replacement guidance for automotive-grade Zener selection.
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 is guaranteed at IZ = 50 µA, with temperature coefficient of +12.4 mV/K and capacitance of 70 pF at 0 V - supporting noise-sensitive analog front-ends.
The C-series variant features intentional minor leakage rise to optimize fast switching transients and reduce high-frequency noise, distinct from B-series tighter-tolerance parts. It is qualified per AEC-Q101 with junction temperature rating up to 150 °C and ambient operating range from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V at IZ = 50 µA - defines precise regulation point for low-bias reference circuits |
| Tolerance | ±5 % - supports cost-optimized designs where tight voltage accuracy is secondary to reliability |
| Differential Resistance | 225 Ω at IZ = 5 mA - determines load regulation error under varying current draw |
| Reverse Leakage Current | 0.05 µA at VR = 14.4 V - enables ultra-low standby power in battery-backed systems |
| Forward Voltage | 0.9 V at IF = 10 mA - sets conduction loss during forward-bias protection or clamp use |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - constrains maximum continuous Zener current to ~13.9 mA at 18 V |
| Junction-to-Ambient Thermal Resistance | 500 K/W - requires careful PCB copper area planning for sustained power 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 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | No internal connection; must remain unconnected on PCB |
| 3 | Cathode (K) | Connected to higher-potential node; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensors |
| Low test current specification | Regulation defined at 50 µA - enables use in microamp-level bias networks without loading |
| Optimized leakage profile | Intentional minor IR increase improves transient response and reduces broadband noise in signal chains |
| Thermal robustness | 150 °C max junction temperature supports under-hood deployment without derating |
Applications
| Automotive ECU Reference | Portable Sensor Biasing |
|---|---|
Use Scenario: Providing stable 18 V reference for ADC input scaling in engine control modules. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for analog signal conditioning circuitry. Use Value: Maintains <±1 % reference drift over −40 °C to +125 °C due to AEC-Q101 thermal validation and +12.4 mV/K TC compensation. |
Use Scenario: Biasing photodiode amplifiers in handheld medical pulse oximeters. IC Role / Device Role / Timing Role: Low-current Zener reference establishing precision op-amp feedback node. Use Value: Draws only 0.05 µA leakage at 14.4 V, extending coin-cell battery life beyond 5 years in standby mode. |
| Industrial PLC Input Protection | IoT Node Voltage Clamping |
Use Scenario: Protecting 18 V analog input channels against overvoltage transients in factory automation controllers. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing surge energy while limiting voltage excursion. Use Value: 40 W non-repetitive peak power dissipation (tp = 100 µs) prevents damage from IEC 61000-4-4 bursts. |
Use Scenario: Stabilizing LDO feedback divider in NB-IoT cellular modems operating on Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Precision voltage reference setting regulated output of ultra-low-quiescent LDOs. Use Value: 225 Ω dynamic impedance ensures <0.5 % output variation across 1–5 mA load current changes. |
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 % tolerance, but not AEC-Q101 qualified; Rth(j-a) = 530 K/W | Limited to industrial/commercial environments; lacks automotive stress-test validation | Select when AEC-Q101 compliance is unnecessary and cost is primary constraint |
| MMSZ5245B | 18 V nominal, ±5 %, but specified at IZ = 20 mA; higher leakage (0.1 µA at 14.4 V); SOD-123 package | Higher power handling (500 mW), but larger footprint and less suitable for ultra-low-IQ designs | Choose when board space allows SOD-123 and higher test current aligns with system bias architecture |
Compared with BZX8450-C18-Q, BZX84-C18 lacks automotive qualification and has marginally worse thermal performance, while MMSZ5245B trades ultra-low leakage and compact SOT23 size for higher power capability and less optimized low-current regulation.
Availability
BZX8450-C18-Q is available at Aetrix Electronics and suitable for automotive ECU design, portable medical sensor biasing, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-C18-Q 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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and scalability.
This part belongs to the BZX8450-Q series of AEC-Q101-qualified Zener diodes engineered specifically for automotive voltage reference and regulation in space-constrained, low-power systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C18-Q?
The nominal Zener voltage is 18 V, with guaranteed minimum 17.1 V and maximum 18.9 V at IZ = 50 µA. Breakdown occurs within this band; operation above 18.9 V risks exceeding the 250 mW power limit unless current is strictly limited by external series resistance.
Can BZX8450-C18-Q be used in forward-bias configuration?
Yes - it functions as a standard silicon diode with 0.9 V forward voltage at 10 mA. However, its primary design purpose is reverse-bias regulation; forward conduction is only specified for protection or dual-role clamping, not as a rectifier.
Is pin 2 truly unconnected, or does it serve a thermal function?
Pin 2 is electrically unconnected (n.c.) per Nexperia's official pinning diagram and package outline. It has no internal bond wire or die connection and must remain floating on the PCB - no thermal or electrical role is assigned to this terminal.
How does the "C" suffix differ from "B" in the BZX8450-Q series?
The "C" suffix denotes ±5 % tolerance and an intentional minor rise in leakage current optimized for faster switching and reduced noise, whereas "B" indicates ±2 % tolerance and lower leakage. Both share identical packaging, thermal specs, and AEC-Q101 qualification.
BZX8450-C18-QVL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C18-QVL FAQ
1.How can I place an order for BZX8450-C18-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C18-QVL 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-C18-QVL reliable?
The price and inventory of BZX8450-C18-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C18-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C18-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C18-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C18-QVL?
BZX8450-C18-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C18-QVL 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-C18-QVL?
For technical support, including BZX8450-C18-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C18-QVL requirements.
6.How does Aetrix verify that BZX8450-C18-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C18-QVL 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-C18-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C18-QVL?
All BZX8450-C18-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C18-QVL, 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-C18-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C18-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C18-QVL 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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